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Variable displacement vane pump

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20130034460 patent thumbnailZoom

Variable displacement vane pump


A variable displacement vane pump has an inner peripheral face of a cam ring formed so that in a maximum eccentric state, a radius vector gradually shortens according to the rotation of a rotor in an area from a starting point of a first seal interval to an intermediate point of the first seal interval and an area from an intermediate point of a second seal interval to an end point of the second seal interval. The inner peripheral face of the cam ring is formed so that in a minimum eccentric state, the radius vector is substantially fixed or gradually lengthens according to the rotation of the rotor in other areas.


Browse recent Hitachi Automotive Systems, Ltd. patents - Hitachinaka-shi, JP
USPTO Applicaton #: #20130034460 - Class: 418 24 (USPTO) - 02/07/13 - Class 418 
Rotary Expansible Chamber Devices > With Changeable Working Chamber Magnitude >Spring Or Fluid Biased Movable Member

Inventors: Yoko Tsukada, Shinji Seto, Yukio Uchida

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The Patent Description & Claims data below is from USPTO Patent Application 20130034460, Variable displacement vane pump.

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BACKGROUND

1. Technical Field

The present invention relates to a variable displacement vane pump used for working fluid application equipment such as a power steering for reducing a steering wheel operating force of an automobile for example.

2. Related Art

For the well-known technology related to this type of variable displacement vane pump, a variable displacement pump (JP-A No. 2002-115673) can be given for an example, the variable displacement pump having structure that an inside diameter in an intermediate interval between a suction interval and a discharge interval in a pump room of a cam ring forms a negative sloping curve with an end of a suction port as a starting point so as to prevent a pulsation phenomenon of working fluid in a large eccentric area of the cam ring and further, the negative sloping curve and a complete round curve are connected by a higher order curve.

Generally, in a variable displacement vane pump, in a fixed displacement area equivalent to a low-speed area of the pump in which discharge per one rotation is fixed, when a situation in which a vane is separated from an inner peripheral face of a cam ring occurs, pressure pulsation is caused or in a variable displacement area equivalent to a high-speed area of the pump in which discharge per one rotation decreases as the rotation speed of the pump increases, vibration is apt to grow by the unbalance of pressure, compared with a case of a fixed displacement vane pump, and as noise is made by the pressure pulsation and the vibration, it has been a technical objective to reduce such noise.

In the variable displacement vane pump disclosed in JP-A No. 2002-115673, to reduce noise by the separation of a vane, in a maximum eccentric state in which the eccentricity to a rotor of the cam ring is maximum, a distance to the rotational center of the rotor is made to gradually shorten according to the rotation of the rotor in an area from a termination of a suction port to a starting end of a discharge port and an area from a termination of the discharge port to a starting end of the suction port on an inner peripheral face of the cam ring, hereby, the separation of the vane is prevented and the occurrence of noise is restrained.

However, as the compressibility of the volume of the pump room increases in a variable displacement area and peak pressure grows when the inner peripheral face of the cam ring has such a shape, the variable displacement vane pump has a problem that noise by vibration is apt to be made.

In short, the variable displacement vane pump disclosed in JP-A No. 2002-115673 has structure that even if the separation of the vane in a fixed displacement area is restrained and the occurrence of noise caused by pressure pulsation can be prevented, a peak of pressure in the pump room in the variable displacement area is not restrained and it is difficult to prevent the occurrence of noise by vibration.

SUMMARY

The present invention is made in view of such a problem and a technical object of the present invention is to provide a variable displacement vane pump having structure that the separation of a vane in a fixed displacement area and a peak of pressure in a pump room in a variable displacement area are restrained and the occurrence of noise caused by pressure pulsation and vibration can be fully prevented.

To achieve the technical object, in accordance with a first feature of the present invention, there is provided a variable displacement vane pump for transmitting steering operation on a steering wheel to a steered wheel and supplying working fluid to a steering gear for a vehicle that generates steering assist force by hydraulic pressure of the working fluid. The variable displacement vane pump includes a pump housing equipped with a pump element storage part, a driving shaft journaled to the pump housing, a rotor provided in the pump housing, rotatively driven by the driving shaft and having plural slots in a circumferential direction, plural vanes provided in a freely projecting/retreating manner in the plural slots, a cam ring annularly formed movably on/over the pump element storage part and forming plural pump rooms together with the rotor and the plural vanes on an inner peripheral side and a cam ring control mechanism that is provided to the pump housing and controls eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to an area in which volume of the plural pump rooms increases according to the rotation of the rotor and a discharge port open to an area in which the volume of the plural pump rooms decreases. An inner peripheral face of the cam ring is formed so that in a maximum eccentric state in which eccentricity to the rotor of the cam ring is maximum, a distance to the rotational center of the rotor gradually shortens according to the rotation of the rotor in at least one of an area from a termination of the suction port to an intermediate point of the termination of the suction port and a starting end of the discharge port and an area from an intermediate point of a termination of the discharge port and a starting end of the suction port to the starting end of the suction port in a rotational direction of the rotor, and the inner peripheral face of the cam ring is formed so that in a minimum eccentric state in which the eccentricity to the rotor of the cam ring is minimum, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of an area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and at least a part of an area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port.

In accordance with a second feature, in addition to the first feature, the driving shaft is rotatively driven by an engine of the vehicle and the inner peripheral face of the cam ring is formed so that when the vehicle is run, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port.

In accordance with a third feature, in addition to the first feature, the driving shaft is rotatively driven by the engine of the vehicle and the inner peripheral face of the cam ring is formed so that when engine speed is 1500 rpm or more every minute, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port.

In accordance with a fourth feature, in addition to the first feature, the inner peripheral face of the cam ring is formed so that in the maximum eccentric state, at least one of the area from the termination of the suction port to the intermediate point of the termination of the suction port and the starting end of the discharge port and the area from the intermediate point of the termination of the discharge port and the starting end of the suction port to the starting end of the suction port and areas before and after at least the one that connect with at least the one are connected by a higher order curve and the inner peripheral face of the cam ring is formed so that in the minimum eccentric state, at least one of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and the area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port and areas before and after at least the one that connect with at least the one are connected by a higher order curve.

In accordance with a fifth feature, in addition to the first feature, the inner peripheral face of the cam ring is formed so that in the minimum eccentric state, the distance to the rotational center of the rotor gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port.

In accordance with a sixth feature, in addition to the first feature, the eccentricity to the rotor of the cam ring is controlled by swinging or rolling the cam ring in a state in which the cam ring is supported by a supporting face provided on a side of the discharge port of an inner peripheral face of the pump element storage part.

In accordance with a seventh feature, in addition to the sixth feature, the center of an inside diameter of the cam ring is located on the side of the suction port apart from the center of the rotor in an unloaded condition in which differential pressure between pressure on the side of the suction port and pressure on the side of the discharge port does not act on the driving shaft, the rotor and the cam ring, and in a state in which the driving shaft is elastically deformed on the side of the suction port by the action of the differential pressure, a relative position based upon a port reference line is located on the side of the discharge port apart from the relative position in the unloaded condition the cam ring is rollably supported by the supporting face provided on the side of the discharge port of the inner peripheral face of the pump element storage part and the supporting face is formed so that the center of the inside diameter of the cam ring gradually separates on the side of the discharge port from the port reference line as the cam ring is rolled in a direction from the maximum eccentric state to the minimum eccentric state.

In accordance with an eighth feature, in addition to the first feature, the inner peripheral face of the cam ring is formed so that in the maximum eccentric state, the distance to the rotational center of the rotor gradually shortens according to the rotation of the rotor in the area from the termination of the suction port to the intermediate point of the termination of the suction port and the starting end of the discharge port in the rotational direction of the rotor and the inner peripheral face of the cam ring is formed so that in the minimum eccentric state, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least a part of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port.

In accordance with a ninth feature, in addition to the eighth feature, the inner peripheral face of the cam ring is formed so that in the maximum eccentric state, the distance to the rotational center of the rotor gradually shortens according to the rotation of the rotor in the area from the termination of the suction port to the intermediate point of the termination of suction port and the starting end of the discharge port and the area from the intermediate point of the termination of the discharge port and the starting end of the suction port in the rotational direction of the rotor and the inner peripheral face of the cam ring is formed so that in the minimum eccentric state, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least a part of the area from the intermediate point of the termination of the suction port and the starting end of the discharge port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the intermediate point of the termination of the discharge port and the starting end of the suction port.

In accordance with a tenth feature, in addition to the first feature, the plural odd slots and the plural odd vanes are provided to the rotor.

In accordance with an eleventh feature of the present invention, there is provided a variable displacement vane pump for transmitting steering operation on a steering wheel to a steered wheel and supplying working fluid to a steering gear for a vehicle that generates steering assist force by the hydraulic pressure of the working fluid. The variable displacement vane pump includes a pump housing equipped with a pump element storage part, a driving shaft journaled to the pump housing, a rotor provided in the pump housing, rotatively driven by the driving shaft and having plural slots in a circumferential direction, plural vanes provided in a freely projecting/retreating manner in the plural slots, a cam ring annularly formed movably on/over the pump element storage part and forming plural pump rooms together with the rotor and the plural vanes on an inner peripheral side and a cam ring control mechanism that is provided to the pump housing and controls eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to an area in which volume of the plural pump rooms increases according to rotation of the rotor and a discharge port open to an area in which the volume of the plural pump rooms decreases, and an inner peripheral face of the cam ring is formed so that in a maximum eccentric state in which the eccentricity to the rotor of the cam ring is maximum, a distance to the rotational center of the rotor gradually shortens according to the rotation of the rotor in at least one of an area from a termination of the suction port to a starting end of the discharge port in a rotational direction of the rotor and an area from a termination of the discharge port to a starting end of the suction port and the inner peripheral face of the cam ring is formed so that in a minimum eccentric state in which the eccentricity to the rotor of the cam ring is minimum, distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with a twelfth feature, in addition to the eleventh feature, the driving shaft is rotatively driven by an engine of the vehicle and the inner peripheral face of the cam ring is formed so that when the vehicle is run, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with a thirteenth feature, in addition to the eleventh feature, the driving shaft is rotatively driven by the engine of the vehicle and the inner peripheral face of the cam ring is formed so that when engine speed is 1500 rpm or more every minute, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with a fourteenth feature, in addition to the eleventh feature, the eccentricity to the rotor is controlled by swinging or rolling the cam ring in a state in which the cam ring is supported by a supporting face provided on a side of the discharge port of an inner peripheral face of the pump element storage part.

In accordance with a fifteenth feature, in addition to the fourteenth feature, the center of an inside diameter of the cam ring is located on the side of the suction port based upon a port reference line that joins the intermediate point of the termination of the suction port and the starting end of the discharge port and the center of the rotor in an unloaded condition in which differential pressure between pressure on the side of the suction port and pressure on the side of the discharge port does not act on the driving shaft, the rotor and the cam ring, a relative position based upon the port reference line in the unloaded condition in a state in which the driving shaft is elastically deformed on the side of the suction port by the action of the differential pressure is located on the side of the discharge port apart from the relative position the cam ring is rollably supported by the supporting face provided on the side of the discharge port of the inner peripheral face of the pump element storage part and the supporting face is formed so that the center of the inside diameter of the cam ring gradually separates from the port reference line as the cam ring is rolled in a direction from the maximum eccentric state to the minimum eccentric state.

In accordance with a sixteenth feature of the present invention, there is provided a variable displacement vane pump for transmitting steering operation on a steering wheel to a steered wheel and supplying working fluid to a steering gear for a vehicle that generates steering assist force by the hydraulic pressure of the working fluid. The variable displacement vane pump includes a pump housing equipped with a pump element storage part, a driving shaft journaled to the pump housing, a rotor provided in the pump housing, rotatively driven by the driving shaft and having plural slots in a circumferential direction, plural vanes movably provided in the plural slots, a cam ring annularly formed movably on/over the pump element storage part and forming plural pump rooms together with the rotor and the plural vanes on an inner peripheral side and a cam ring control mechanism that is provided to the pump housing and controls eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to an area in which volume of the plural pump rooms increases according to rotation of the rotor and a discharge port open to an area in which the volume of the plural pump rooms decreases, an inner peripheral face of the cam ring is formed so that in a maximum eccentric state in which the eccentricity to the rotor of the cam ring is maximum in a state in which the cam ring is relatively moved from the side of the suction port to the side of the discharge port by the action on the driving shaft, the rotor and the cam ring of differential pressure between pressure on the side of the suction port and pressure on the side of the discharge port, compared with an unloaded condition in which no differential pressure acts, a distance to the rotational center of the rotor gradually shortens according to the rotation of the rotor in at least one of an area from a termination of the suction port to a starting end of the discharge port in a rotational direction of the rotor and an area from a termination of the discharge port to a starting end of the suction port and the inner peripheral face of the cam ring is formed so that in a minimum eccentric state in which the eccentricity to the rotor of the cam ring is minimum, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with a seventeenth feature, in addition to the sixteenth feature, the driving shaft is rotatively driven by an engine of the vehicle and the inner peripheral face of the cam ring is formed so that when the vehicle is run, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with an eighteenth feature, in addition to the sixteenth feature, the driving shaft is rotatively driven by the engine of the vehicle and the inner peripheral face of the cam ring is formed so that when engine speed is 1500 rpm or more every minute, the distance to the rotational center of the rotor is substantially fixed or gradually lengthens according to the rotation of the rotor in at least one of at least a part of the area from the termination of the suction port to the starting end of the discharge port and at least a part of the area from the termination of the discharge port to the starting end of the suction port.

In accordance with a nineteenth feature, in addition to the sixteenth feature, the eccentricity to the rotor of the cam ring is controlled by swinging or rolling the cam ring in a state in which the cam ring is supported by a supporting face provided on a side of the discharge port of an inner peripheral face of the pump element storage part.

In accordance with a twentieth feature, in addition to the nineteenth feature and has a characteristic that the center of an inside diameter of the cam ring is located on the side of the suction port apart from a port reference line that joins an intermediate point of the termination of the suction port and the starting end of the discharge port and the center of the rotor in the unloaded condition in which differential pressure between pressure on the side of the suction port and pressure on the side of the discharge port does not act on the driving shaft, the rotor and the cam ring, a relative position based upon the port reference line in a state in which the driving shaft is elastically deformed on the side of the suction port by the action of the differential pressure is located on the side of the discharge port apart from the relative position in the unloaded condition, the cam ring is rollably supported by the supporting face provided on the side of the discharge port of the inner peripheral face of the pump element storage part and the supporting face is formed so that the center of the inside diameter of the cam ring gradually separates from the port reference line as the cam ring is rolled in a direction from the maximum eccentric state to the minimum eccentric state.

According to the variable displacement vane pump of the present invention, as the variable displacement vane pump has the structure in which both the separation of the vane in the fixed displacement area and a peak of pressure in the pump room in the variable displacement area can be restrained by devising a shape of the inner peripheral face of the cam ring, noise can be fully prevented from being made by pressure pulsation and vibration independent of whether the variable displacement vane pump is operated in the fixed displacement area or in the variable displacement area.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be described in detail based on the following drawings, wherein:

FIG. 1 is a side view showing basic structure of a variable displacement vane pump equivalent to a first embodiment of the present invention as a section viewed along an extended direction of a driving shaft;

FIG. 2 is a sectional view showing a maximum eccentric state in which eccentricity to a rotor of a cam ring in the variable displacement vane pump equivalent to the first embodiment of the present invention is maximum and viewed along line A-A in FIG. 1;

FIG. 3 is a sectional view showing a minimum eccentric state in which the eccentricity to the rotor of the cam ring in the variable displacement vane pump equivalent to the first embodiment of the present invention is minimum and viewed along line A-A in FIG. 1;

FIG. 4 is a schematic drawing showing relative positional relation among an inner peripheral face of the cam ring, a suction port and a discharge port respectively in a pressure plate, in the maximum eccentric state illustrated in FIG. 2;

FIG. 5 is a schematic drawing showing relative positional relation among the inner peripheral face of the cam ring, the suction port and the discharge port respectively in the pressure plate in the minimum eccentric state illustrated in FIG. 3;

FIGS. 6A to 6C are characteristic line drawings showing a distance between the rotational center of the rotor and the inner peripheral face of the cam ring in a first seal interval in the variable displacement vane pump equivalent to the first embodiment of the present invention, FIG. 6A is the characteristic line drawing showing a radius vector to an angle in the maximum eccentric state, FIG. 6B is the characteristic line drawing showing the radius vector to the angle in the minimum eccentric state, and FIG. 6C is the characteristic line drawing showing the volume to a central angle of a vane chamber in the minimum eccentric state;

FIGS. 7A to 7C are characteristic line drawings showing a distance between the rotational center of the rotor and the inner peripheral face of the cam ring in a second seal interval in the variable displacement vane pump equivalent to the first embodiment of the present invention, FIG. 7A is the characteristic line drawing showing a radius vector to an angle in the maximum eccentric state, FIG. 7B is the characteristic line drawing showing the radius vector to the angle in the minimum eccentric state, and FIG. 7C is the characteristic line drawing showing the volume to a central angle of a vane chamber in the minimum eccentric state;

FIG. 8 is a schematic drawing showing a section of a local part to explain the mechanism of the separation of a vane caused in structure before improvement in the variable displacement vane pump equivalent to the first embodiment of the present invention;

FIG. 9 is a characteristic line drawing showing pressure to an angle to explain a peak of pressure in a vane chamber caused in the structure before improvement in the variable displacement vane pump equivalent to the first embodiment of the present invention; and

FIGS. 10A and 10B are schematic drawings showing relative positional relation among a rotor, a cam ring, a discharge port and a suction port in relation to a supporting face provided to an adapter in a variable displacement vane pump equivalent to a fifth embodiment of the present invention, FIG. 10A is the schematic drawing showing the relative positional relation in a maximum eccentric state, and FIG. 10B is the schematic drawing showing the relative positional relation in a minimum eccentric state.

DETAILED DESCRIPTION

Referring to the drawings, some embodiments of a variable displacement vane pump according to the present invention will be described in detail below.

First Embodiment

FIG. 1 is a side view showing basic structure of a variable displacement vane pump 1 equivalent to a first embodiment of the present invention as a section viewed along an extended direction of a shaft 13 which is a driving shaft. FIG. 2 is a sectional view viewed along line A-A in FIG. 1 in a state that the eccentricity to a rotor 11 of a cam ring 15 in the variable displacement vane pump 1 is maximum. FIG. 3 is a sectional view viewed along line A-A in FIG. 1 in a state that the eccentricity to the rotor 11 of the cam ring 15 in the variable displacement vane pump 1 is minimum. FIG. 4 is a schematic drawing showing relative positional relation among an inner peripheral face of the cam ring 15, a suction port 22 and a discharge port 21 respectively in a pressure plate 27, in the maximum eccentric state illustrated in FIG. 2. FIG. 5 is a schematic drawing showing relative positional relation among the inner peripheral face of the cam ring 15, the suction port 22 and the discharge port 21 respectively in the pressure plate 27, in the minimum eccentric state illustrated in FIG. 3. Besides, FIG. 1 corresponds to the section viewed along line B-B in FIG. 2. Dotted lines shown in FIGS. 4 and 5 show cases in which the inner peripheral face of the cam ring 15 forms a complete round.

As shown in these drawings, the variable displacement vane pump 1 has body structure as a pump housing configured by matching a recessed front body 10 in which pump components including the rotor 11, a vane 14, the cam ring 15, an adapter 12, the pressure plate 27 and a control valve 30 are incorporated and inserted and a rear cover 19.

A shaft 13 which is a driving shaft for transmitting driving force from an external device connects with the rotor 11 of these components and the shaft 13 is supported by the front body 10 via a bearing 28. Plural (for example, odd) slots 29 are provided to the rotor 11 and the vane 14 in a radially freely projecting/retreating manner in each slot 29 is inserted into each slot. A vane bottom 31 is provided at an inner end of each slot 29. The rotor 11 is rotatively driven by the shaft 13.

The adapter 12 is fitted into a recess of the front body 10 and the cam ring 15 swingably supported by the inside of the adapter 12 with a supporting pin 16 as the center is arranged in a state that the center of its inside diameter is eccentric to the rotational center of the rotor 11. A first fluid pressure chamber 34 is formed on the left side of the cam ring 15 as shown in FIG. 2 by the cam ring 15 and the adapter 12, and a second fluid pressure chamber 35 is formed on the right side. The cam ring 15 is pressed by a compression coil spring 17 in a direction in which the pumping capacity of a vane chamber 18 is maximum.

Space between the rotor 11 and the cam ring 15 is partitioned by the vane 14 and plural vane chambers 18 are formed. The discharge port 21 as an outlet is connected to an area the volume of which is reduced by counterclockwise rotation in FIG. 2 of each vane chamber 18 and the suction port 22 as an inlet is connected to an area the volume of which is increased. Besides, the pressure plate 27 is fitted between a group of the rotor 11, the cam ring 15, the vane 14 and the adapter 12 and the front body 10.



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stats Patent Info
Application #
US 20130034460 A1
Publish Date
02/07/2013
Document #
13564186
File Date
08/01/2012
USPTO Class
418 24
Other USPTO Classes
International Class
/
Drawings
10




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