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Oil pumpRelated Patent Categories: Pumps, With Condition Responsive Pumped Fluid Control, Plural Paths Having Individual Condition Responsive Control MeansOil pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060171818, Oil pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is based on and claims priority under 35 U.S.C. .sctn. 119 to Japanese Patent Application 2005-025198, filed on Feb. 1, 2005, the entire content of which is incorporated herein by reference. FIELD OF THE INVENTION [0002] This invention relates to an oil pump with control valves for controlling a discharge pressure of working oil. BACKGROUND [0003] A known oil pump for controlling a discharge pressure of working oil is disclosed in JP3531769B. As illustrated in FIG. 15, the disclosed oil pump includes a pump main body 101 having a pump chamber 110, a rotor 102 rotating in the pump chamber 110 by means of a drive source, an inlet port 136 sucking the working oil into the pump chamber 110 in response to a rotation of the rotor 102, first and second outlet ports 131 and 132 discharging the working oil out of the pump chamber 110 in response to the rotation of the rotor 102, a first oil passage 151, a second oil passage 152, a feedback oil passage 106, a control unit 107, and a control valve 104. The first oil passage 151 connects a discharge oil passage 105, which is communicated with parts to be supplied with the working oil, to the first outlet port 131, and delivers the working oil to the discharge oil passage 105 discharged from the first outlet port 131. The second oil passage 152 connects the discharge oil passage 105 to the second outlet port 132, and delivers the working oil to the discharge oil passage 105 from the second outlet port 132. The feedback oil passage 106 is connected to the second oil passage 152 and communicated with the inlet port 136. The control unit 107 outputs a control signal on the basis of degree of oil pressure of the first oil passage 151, degree of oil temperature, degree of throttle angle, degree of rotational speed of an internal combustion engine serving as the drive source, or the like. The control valve 104 is connected to the first oil passage 151, the second oil passage 152, and the feedback oil passage 106, and activated on the basis of the control signal of the control unit 107. [0004] On this occasion, the control valve 104 is activated by means of a proportional electromagnetic control mechanism 108. The control unit 107 directly or indirectly detects the oil pressure of the first oil passage 151, the oil temperature, the throttle angle, and the rotational speed of the internal combustion engine. Further, the control unit 107 outputs the control signal for operating the control valve 104, on the basis of the signal detected, for obtaining a predetermined discharge characteristic. Thereby, on the basis of use conditions of the internal combustion engine, the disclosed oil pump offers an optimal discharge pressure by means of an electromagnetic control, and reduces an operation of the pump more than required. [0005] However, the disclosed oil pump includes the proportional electromagnetic control mechanism 108 such as a solenoid, or the like, for activating the control valve 104, the control unit 107 for generating the control signal relative to the proportional electromagnetic control mechanism 108, and a detecting mechanism such as a sensor, or the like, for outputting information such as degree of the oil pressure, degree of the oil temperature, degree of the throttle angle, or the like, relative to the control unit 107. With the configuration of such oil pump, a structure for controlling the discharge pressure of the oil pump may be complicated and a manufacturing cost of the oil pump may occasionally be expensive. [0006] A need thus exists for an oil pump, which appropriately controls the discharge pressure on the basis of a temperature of the working oil with a simple structure. SUMMARY OF THE INVENTION [0007] According to an aspect of the present invention, an oil pump includes a first control valve including a first valve body provided in a first valve housing for reciprocating therein, the first valve body for controlling discharge pressure of working oil discharged from a pump main body, a first valve chamber formed in the first valve housing, the first valve chamber being applied with the discharge pressure of the working oil from the pump main body, and a second valve chamber formed in the first valve housing, the second valve chamber being supplied with the working oil, and a second control valve activated on the basis of degree of the temperature of the working oil, the second control valve for controlling oil pressure of the working oil flowed into the second valve chamber. BRIEF DESCRIPTION OF THE DRAWINGS [0008] The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawings, wherein: [0009] FIG. 1 is a conceptual view illustrating a structure of an oil pump according to a first embodiment of the present invention. [0010] FIG. 2 is a view illustrating a flow of working oil of a state A without showing a main body of the oil pump according to the first embodiment of the present invention. [0011] FIG. 3 is a view illustrating a flow of the working oil of a state B without showing the main body of the oil pump according to the first embodiment of the present invention. [0012] FIG. 4 is a view illustrating a flow of the working oil of a state C without showing the main body of the oil pump according to the first embodiment of the present invention. [0013] FIG. 5 is a view illustrating a flow of the working oil of a state D without showing the main body of the oil pump according to the first embodiment of the present invention. [0014] FIG. 6 is a view illustrating a flow of the working oil of a state E without showing the main body of the oil pump according to the first embodiment of the present invention. [0015] FIG. 7 is a view illustrating a flow of the working oil of an intermediate state without showing the main body of the oil pump according to the first embodiment of the present invention. [0016] FIG. 8 is a view illustrating a flow of the working oil of a high temperature state without showing the main body of the oil pump according to the first embodiment of the present invention. [0017] FIG. 9A is a graph indicating a relation, within a normal temperature region of the working oil, between a rotational speed of a rotor and a discharge pressure of the working oil at a discharge oil passage of the oil pump according to the first embodiment of the present invention. [0018] FIG. 9B is a graph indicating a relation, within a high temperature region of the working oil, between the rotational speed of the rotor and the discharge pressure of the working oil in the discharge oil passage of the oil pump according to the first embodiment of the present invention. [0019] FIG. 10A is a graph indicating a relation, within the normal temperature region of the working oil, between the rotational speed of the rotor and the discharge pressure of the working oil in the discharge oil passage of an oil pump, which includes a first control valve similar to that of the first embodiment of the present invention, and does not include a second control valve. [0020] FIG. 10B is a graph indicating a relation, within the high temperature region of the working oil, between the rotational speed of the rotor and the discharge pressure of the working oil in the discharge oil passage of the oil pump, which includes the first control valve similar to that of the first embodiment of the present invention, and does not include the second control valve. Continue reading about Oil pump... Full patent description for Oil pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Oil pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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