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  Oil and vacuum pumps group for a motor vehicle engineUSPTO Application #: 20070059187Title: Oil and vacuum pumps group for a motor vehicle engine Abstract: An oil and vacuum pumps group (1) for a motor vehicle engine includes a motion transmission shaft (30) extending along a main axis X-X, an oil pump (10) and a vacuum pump (20) fitted on the motion transmission shaft and a gear (40) also fitted on the motion transmission shaft and adapted to derive a rotary motion from a driving gear (41) of a motor vehicle engine and to transfer said rotary motion to the motion transmission shaft to drive the oil pump and the vacuum pump. Advantageously, the oil and vacuum pumps group of the invention is structurally independent from and adapted to be associated with said motor vehicle engine. Preferably, the oil pump (10) and the vacuum pump (20) are units which are structurally independent from each other and the gear (40) of the oil and vacuum pumps group is operatively placed between the oil pump and the vacuum pump. (end of abstract)
Agent: Sughrue Mion, PLLC - Washington, DC, US Inventors: Giuseppe Lo Biundo, Alessandra De Rango, Giovanni Pazzi, Peter Fössl USPTO Applicaton #: 20070059187 - Class: 417364000 (USPTO) Related Patent Categories: Pumps, Motor Driven, Internal-combustion Engine The Patent Description & Claims data below is from USPTO Patent Application 20070059187. Brief Patent Description - Full Patent Description - Patent Application Claims
DESCRIPTION [0001] The present invention relates to an oil and vacuum pumps group for a motor vehicle engine. More specifically, the invention relates, preferably but not exclusively, to an oil and vacuum pumps group for an endothermic engine for heavy motor vehicles, such as buses, trucks and the like, and/or for medium-high powered motor vehicle's. [0002] The invention also relates to a method for assembling an oil and vacuum pumps group in accordance, with the present invention and to a motor vehicle engine comprising such an oil and vacuum pumps group. [0003] As is known, the engines of motor vehicles, above all of heavy motor vehicles and/or high powered motor vehicles, typically comprise an oil pump, adapted to pump pressurised oil for lubricating the engine, and a vacuum pump, adapted to provide for a determined depression for the activation and operation of special features provided within the motor vehicle, such as the servo brake. [0004] Generally, the oil pump and the, vacuum pump are units which are structurally independent from each other and with respect to the engine block; such units are fitted on respective transmission shafts which are driven into rotation 'separately through respective and distinct actuation members (for example, the oil pump can be driven by the crankshaft of the engine and the vacuum pump can be driven by a camshaft). [0005] In some prior art embodiments, the transmission shafts of the oil pump and of the vacuum pump are parallel an kinematically associated with each other so as to be capable of being driven into rotation through a single actuation member (for example through a gear group which derives its motion from the crankshaft of the engine, such a gear group comprising a first sprocket associated with the crankshaft of the engine and a second sprocket fitted onto the transmission shaft of the oil pump and kinematically connected, directly or through the interposition of belts or chains, to a third sprocket fitted onto the transmission shaft of the vacuum pump). [0006] In all of the technical solutions described above, the provision of distinct transmission shafts for the oil pump and the vacuum pump and of respective actuation members for rotating such shafts (when the two shafts are driven independently from each other) or for the kinematic connection between such shafts (when the two shafts are driven through a single actuation member) inevitably implies problems of bulk and weight, due to the high number of mechanical elements or members used and their mutual positioning. Consequently, the assembly and/or installation operations of the oil pump and of the vacuum pump in the engine are also particularly burdensome. [0007] To overcome the aforementioned problems, U.S. Pat. No. 6,345,600 provides an oil and vacuum pumps group in which the rotors of the oil pump and of the vacuum pump are fitted on a single motion transmission shaft driven into rotation by a single gear arranged at the shaft front end and in which the stators of the oil pump and of the vacuum pump are defined by a single housing provided in the engine block. Thus, this is an oil and vacuum pumps group in which oil pump and vacuum pump are integrated in the engine block. In other words, this group consists of a single component which, only when integrated in engine block, carries out the dual function of oil pump and vacuum pump. The provision of a single motion transmission shaft and the integration of the oil and vacuum pumps group in the engine block clearly allows to achieve a reduction in weight and bulk of the oil and vacuum pumps group, at the same time making the assembly and/or installation operations simpler and faster. [0008] The solution proposed in U.S. Pat. No. 6,345,600, although advantageous for achieving the purposes foreseen and above identified, does however have some drawbacks. First of all, the choice of integrating the oil and vacuum pumps group in the engine block requires special technical provisions to be arranged in the engine block, in particular suitable housings or seats for the rotors of the oil pump and of the vacuum pump must be provided in the engine block. This involves, on the one hand, a complication of the design and manufacturing operations of the engine block and, on the other hand, clear limits in terms of interchangeability and flexibility in the combined use of the engine and of the oil and vacuum pumps group, or else the impossibility of using a single engine for different types of oil and vacuum pumps groups or vice-versa (one thinks, for example, that different sizes of the rotors of the oil pump and of the vacuum pump could require different sizes of the respective stators, and thus different sizes of the housings arranged in the engine block). Moreover, the integration of the oil and vacuum pumps group in the engine block implies the risk of damaging, during the assembly and/or installation and/or maintenance operations of the oil and vacuum pumps group, the walls of the housings suitably provided in the engine block and acting as a stator for the oil pump and for the vacuum pump, with the consequent need for intervention on such walls through subsequent rectification operations. The assembly, disassembly and maintenance operations of the oil and vacuum pumps group are thus particularly delicate, precisely due to the risk of damaging the engine block. [0009] The technical problem at the basis of the present invention is that of providing an oil and vacuum pumps group which overcomes the drawbacks outlined above with reference to the prior art; in particular, the object of the present invention is that of providing an oil and vacuum pumps group which, besides being structurally and functionally simple, can ensure the desired features of interchangeability and flexibility in the combined use with an engine for motor vehicles and of speed and/or simplicity in the assembly and installation operations, at the same time ensuring bulk reduction. [0010] Therefore, the present invention relates, in a first aspect thereof, to an oil and vacuum pumps group for a motor vehicle engine, comprising: [0011] at least one motion transmission shaft extending along a main axis X-X; [0012] at least one oil pump fitted on said at least one motion transmission shaft; [0013] at least one vacuum pump fitted onto said at least one motion transmission shaft; [0014] a gear fitted onto said at least one motion transmission shaft and adapted to derive a rotary motion from a driving gear of a motor vehicle engine and to transfer said rotary motion to said at least one motion transmission shaft to drive said at least one oil pump and said at least one vacuum pump; [0015] characterised in that the group is structurally independent from and adapted to be associated with said motor vehicle engine. [0016] Throughout the present description and the subsequent claims, the term "gear" is used to indicate any conventional mechanical member adapted to derive the motion from a different mechanical member and to transfer it to a further mechanical member. Preferably, the gear of the oil and vacuum pumps group of the present invention consists of a sprocket adapted to engage directly with a driving gear associated with the crankshaft of the motor vehicle engine. Alternatively, the deriving of motion from the driving gear can take place indirectly through the interposition of belts or chains. [0017] Advantageously, the oil and vacuum pumps group of the present invention is a structurally and functionally free-standing component with respect to the engine, i.e. a component which is structurally and functionally independent from the engine. Such a component can be associated with and detached from the engine; it can therefore be used indistinctly in combination with a plurality of different engines, since it is not necessary to provide the engine with suitable housings for the oil pump and/or vacuum pump. It is thus a components which is extremely interchangeable and flexible in use. [0018] Even more advantageously, since the installation of the oil and vacuum pumps group of the present invention does not require any prior intervention on the engine with which said group is adapted to be associated (except that of providing the engine with conventional attachment means of the group of the invention), the installation operations are extremely simple and fast, as well as the disassembly and maintenance operations of the group. Such operations, in any case, do not in any way involve the structure of the engine, which thus does not run the risk of being damaged or compromised. [0019] Moreover, the choice of an aligned configuration of the oil pump and vacuum pump and of a single gear for driving the oil pump and the vacuum pump allows the number of mechanical elements used to be limited, thus giving the desired reduction in bulk and weight. [0020] Preferably, said at least one oil pump and said at least one vacuum pump are units which are structurally independent from each other. The oil and vacuum pumps group of the present invention therefore consists of a modular combination of at least one oil pump, at least one vacuum pump and a motion deriving gear, all of the conventional type. Advantageously, such modularity allows to achieve clear advantages in terms of interchangeability of the individual components, namely the oil pump, the vacuum pump and the gear, as well as to achieve many advantages in the assembly, disassembly and maintenance operations of the aforementioned components. [0021] Preferably, said gear is operatively placed between said at least one oil pump and said at least one vacuum pump. Such a constructive configuration is particularly advantageous for those particular engines in which it is necessary to meet precise restrictions in terms of bulk and layout. In particular, such a constructive configuration is particularly advantageous for 4.times.4 engines, or engines for four-wheel drive motor vehicles, where it is necessary to provide for a suitable motion transmission shaft for the front drive wheels of the vehicle. Indeed, in such engines, considering the structural restriction given by the positioning of the driving gear from which the motion is derived, the fact of positioning the gear of the oil and vacuum pumps group between the oil pump and the vacuum pump ensures that, once the oil and vacuum pumps group is installed in the engine with its own gear positioned at the driving gear, the vacuum pump is arranged in a space which typically is unused (the space downstream of the gear and defined in the corner between the oil sump and the engine front end), thus recovering a corresponding axial space upstream of the gear. Such a recovered space can advantageously be used for other purposes, such as for the passage of the shaft for motion transmission to the front drive wheels of the motor vehicle. [0022] Preferably, said at least one oil pump is a single-stage pump, but alternatively a two-stage pump can be provided. The man skilled in the art shall understand that it is also foreseeable to use more than one oilpump and more than one vacuum pump in line (should a plurality of different applications or features be slaved) whilst still remaining within the scope of protection of the present invention as claimed hereafter. [0023] Preferably, the oil and vacuum pumps group of the present invention also comprises means for the attachment to an engine block. More preferably, said means for the attachment to an engine block comprises a plurality of brackets adapted to cooperate with respective brackets formed on said engine block. In any case, these are conventional means which, when associated with the oil and vacuum pumps group of the present invention, allow to achieve the desired advantages of constructive simplicity and simplicity/speed of execution of the assembly and disassembly operations of the group of the invention in and from the engine. [0024] Preferably, said at least one oil pump and said at least one vacuum pump are fitted onto a single motion transmission shaft. Such a solution is particularly preferred since it allows the number of mechanical elements used, and thus the weight and bulk of the oil and vacuum pumps group of the invention, to be limited. In a less preferred alternative embodiment, said at least one oil pump and said at least one vacuum pump are fitted respectively on a first and second motion transmission shafts, said first and second motion transmission shafts being kinematically associated with said gear and aligned along said axis X-X. [0025] In a second aspect thereof, the present invention relates to a method for assembling an oil and vacuum pumps group for a motor vehicle engine, comprising the steps of: [0026] a) providing at least one motion transmission shaft; [0027] b) providing at least one oil pump; [0028] c) providing at least one vacuum pump; Continue reading... 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