CN115788862A - Integrated oil pump - Google Patents

Abstract

The invention discloses an integrated oil pump which comprises a pump body and a pump cover, wherein a driving gear shaft, a driven gear and an inner rotor shaft assembly are arranged in a cavity of the pump body, outer teeth are arranged on the periphery of the driven gear, inner teeth are arranged in an inner hole of the driven gear, the inner rotor shaft assembly is composed of an inner rotor and a shaft, the inner rotor is positioned in the inner hole of the driven gear and forms an inner meshing rotor pump with the inner teeth on the driven gear, and the outer teeth of the driven gear and the outer teeth of the driving gear shaft form an outer meshing gear pump. In the technical scheme, the outer rotor of the internal meshing rotor pump is integrated on the driven gear of the gear pump skillfully, so that two independent oil pumps are formed, the number of parts of the two pumps is greatly reduced compared with that of a traditional series pump, and the volumes of the two oil pumps are hardly increased compared with that of a traditional single external meshing involute gear pump.

Description

Integrated oil pump

Technical Field

The invention relates to the technical field of new energy and hybrid vehicle speed reducer lubricating and heat management systems, in particular to an integrated oil pump.

Background

In the prior art, the pure electric vehicle and the extended range electric vehicle drive the motor to work by the aid of electric energy of the power battery, the power of the motor is reduced in speed and increased in torque by the aid of the speed reducer and then transmitted to wheels, and accordingly the vehicle is driven to run. And it will increase the journey ware to increase a set of journey ware to compare pure electric vehicle to increase the form electric motor car, increase the journey ware by the engine, gear box and three most constitutions of generator, can charge for power battery at any time, be in the higher interval work of thermal efficiency in order to ensure to increase the journey ware engine, the gear box drives the generator work after with the engine speed rising, the generator also can produce a large amount of heats at full load during operation, consequently, increase the lubrication of gear box on the journey ware and the heat dissipation of generator and also need cool off with the help of fluid, thereby ensure to increase the long-time effectual work of journey ware ability. In order to effectively lubricate and manage the systems, an oil pump is needed to be arranged, and oil is pressurized by the oil pump and then is conveyed to different parts through different pipelines for lubrication and heat dissipation. Traditional reduction gear oil pump can be with the great of discharge capacity design in order to satisfy the lubricated and heat dissipation demand of system, and single oil pump export also can only provide the oil pressure of single pressure, and these factors let the oil pump can't realize accurate pressure and oil mass in order to satisfy the lubrication and the heat dissipation in different regions, cause the more energy consumption of oil pump consumption.

As for a hybrid electric vehicle, a hybrid transmission (DHT) is generally mounted on the hybrid electric vehicle, and has two to three gears, so that a motor and an engine can be at an economical operating speed at any time. Generally, only one oil pump is arranged in the whole system, and in order to meet the pressure of a hydraulic actuator, the pressure provided by the oil pump is generally higher (about 1 MPa), but only 2bar to 3bar is needed for lubricating and radiating other parts, so that the pressure of oil in the lubricating system needs to be reduced, and the power consumption is wasted.

In order to solve the problems, some oil pumps with double-pump structures are also developed in the field of new energy, lubrication and hydraulic pressure of a system are separated, accurate control is achieved, and power consumption is reduced.

Disclosure of Invention

The invention aims to provide an integrated oil pump which is compact in structure and accurate in control.

In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides an integrated form oil pump, includes the pump body, pump cover, install a driving gear axle, a driven gear and an inner rotor shaft subassembly in the cavity of the pump body, driven gear's periphery is equipped with the external tooth, and its hole is equipped with the internal tooth, inner rotor shaft subassembly comprises inner rotor and pivot, inner rotor is arranged in driven gear's hole and constitutes the internal gearing impeller pump with the internal tooth on the driven gear, and external gearing impeller pump is constituteed with the external tooth of driving gear axle to driven gear's external tooth.

In the technical scheme, the outer rotor of the internal meshing rotor pump is integrated on the driven gear of the gear pump skillfully, so that two independent oil pumps are formed, the number of parts of the two pumps is greatly reduced compared with that of a traditional series pump, and the volumes of the two oil pumps are hardly increased compared with that of a traditional single external meshing involute gear pump. The two oil pumps can adjust respective theoretical discharge capacities, can provide two different pressures and oil liquid simultaneously, can provide low-pressure lubricating and cooling oil by using one oil pump when being applied to a pure electric vehicle or a hybrid electric vehicle, and provides high-pressure hydraulic pressure by using the other oil pump, so that the embarrassing situation that a single oil pump needs to meet both the hydraulic pressure and the lubricating and cooling is solved.

In one embodiment, the pump body is provided with a driven gear cavity for accommodating a driven gear, a driving gear cavity for accommodating a driving gear shaft and a pump body driving shaft hole for supporting the driving gear shaft to rotate, and a gear pump oil inlet cavity is arranged on one side between the driven gear cavity and the driving gear cavity, and a gear pump oil outlet cavity is arranged on the other side between the driven gear cavity and the driving gear cavity; the lower part of the driven gear cavity is also provided with a stepped shaft hole which is composed of a large hole section and a small hole section, wherein the large hole section provides a support for the rotation of the driven gear, the small hole section provides a support for the rotation of the inner rotor shaft assembly, and a rotor pump oil inlet cavity and a rotor pump oil outlet cavity are arranged on a stepped surface between the large hole section and the small hole section.

In one embodiment, a pump cover driving shaft hole, a gear pump auxiliary oil inlet cavity and a gear pump auxiliary oil outlet cavity are formed in the inner end face of the pump cover, a gear pump oil inlet is formed in the position, corresponding to the gear pump auxiliary oil inlet cavity, of the pump cover, and a gear pump oil outlet is formed in the position, corresponding to the gear pump auxiliary oil outlet cavity, of the pump cover; the pump cover is characterized in that a rotor shaft hole, a rotor pump auxiliary oil inlet cavity and a rotor pump auxiliary oil outlet cavity are further formed in the inner end face of the pump cover, a rotor pump oil inlet is formed in the position, corresponding to the rotor pump auxiliary oil inlet cavity, of the pump cover, and a rotor pump oil outlet is formed in the position, corresponding to the rotor pump auxiliary oil outlet cavity, of the pump cover.

In one embodiment, the drive gear shaft includes a long shaft end, a short shaft end, and an external gear.

In one embodiment, the middle part of the end face of one end of the driven gear is provided with an outward-protruding cylindrical part, and the cylindrical part is installed in the large hole section of the stepped shaft hole of the pump body.

Preferably, the external gear of the driving gear shaft and the external gear of the driven gear are both in involute tooth form, the internal teeth of the driven gear are rotor pump outer rotor molded lines, and the external teeth of the inner rotor are rotor pump inner rotor molded lines.

As the preferred scheme, the driving gear shaft is machined and formed by alloy steel, the driven gear and the inner rotor are sintered and formed by powder metallurgy, and the rotating shaft is pressed in a shaft hole of the inner rotor in an interference fit mode. The powder metallurgy sintering molding can well solve the problem of manufacturing cost, not only can realize large-scale batch production, but also brings certain NVH advantages.

In order to provide lubrication for the two ends of the driving gear shaft and the rotating shaft, a first lubricating oil groove is formed between an oil pumping cavity of the gear pump and a driving shaft hole of the pump body; a second lubricating oil groove is formed between the oil pumping cavity of the rotor pump and the stepped shaft hole; a third lubricating oil groove is formed between the oil outlet cavity of the gear pump pair and the driving shaft hole of the pump cover; and a fourth lubricating oil groove is formed between the oil outlet cavity of the rotor pump pair and the rotor shaft hole.

In one embodiment, the pump cover is provided with a positioning sleeve, and two ends of the positioning sleeve are higher than two end surfaces of the pump cover.

Drawings

FIG. 1 is a schematic diagram of an exploded structure of an oil pump in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an oil pump according to an embodiment of the present invention;

FIG. 3 is a schematic view of a driving gear shaft according to an embodiment of the present invention;

FIG. 4 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of a driven gear in an embodiment of the present invention;

FIG. 6 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 5;

FIG. 7 is a schematic structural view of an inner rotor shaft assembly in an embodiment of the present invention;

FIG. 8 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 7;

FIG. 9 is a schematic view of a pump body according to an embodiment of the present invention;

FIG. 10 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 9;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a schematic structural diagram of an inner end surface of a pump cover in an embodiment of the invention;

FIG. 13 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 12;

FIG. 14 is a cross-sectional view taken along line B-B of FIG. 12;

fig. 15 is a schematic structural diagram of the outer end surface of the pump cover in fig. 12.

The reference signs are:

1-driving gear 2-screw

3-Pump body 301-Pump body Driving shaft hole

302-driving gear cavity 303-large hole section

304-driven gear cavity 305-small hole section

306-gear pump oil inlet cavity 307-gear pump oil outlet cavity

308-first lubricating oil groove 309-rotor pump oil inlet cavity

310-rotor pump-out oil chamber 311-second lubrication groove

312-positioning sleeve hole 4-driving gear shaft

41-long shaft end 42-short shaft end

43 external gear 5 driven gear

51-cylindrical portion 52-external teeth

53-internal tooth 6-rotor shaft assembly

61 inner rotor 62 rotating shaft

7-Pump cover 701-Pump cover Driving shaft hole

702-rotor shaft hole 703-gear pump auxiliary oil inlet cavity

704-gear pump oil inlet 705-gear pump secondary oil outlet cavity

706-gear pump oil outlet 707-third lubricating oil groove

708-rotor pump auxiliary oil inlet cavity 709-rotor pump auxiliary oil outlet cavity

710-fourth lubricating oil groove 711-rotor pump oil inlet

712-rotor pump outlet 713-locating sleeve.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention is further described below with reference to the following examples and the accompanying drawings, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1 to 15, an integrated oil pump comprises a transmission gear 1, a screw 2, a pump body 3 and a pump cover 7, wherein a driving gear shaft 4, a driven gear 5 and an inner rotor shaft assembly 6 are arranged in a cavity of the pump body 3; the driving gear shaft 4 is formed by alloy steel in a machining mode and comprises a long shaft end 41, a short shaft end 42 and an outer gear 43 in the middle; the periphery of the driven gear 5 is provided with external teeth 52, the inner hole of the driven gear is provided with internal teeth 53, and the middle part of the end surface of one end of the driven gear 5 is provided with an outwardly convex cylindrical part 51; the inner rotor shaft assembly 6 is formed by interference press-fitting an inner rotor 61 and a rotating shaft 62; the driven gear 5 and the inner rotor 61 are sintered and molded by powder metallurgy, the inner rotor 61 is positioned in an inner hole of the driven gear 5 and forms an inner meshing rotor pump with the inner teeth 53 on the driven gear 5, and the outer teeth 52 of the driven gear 5 and the outer gear 43 of the driving gear shaft 4 form an outer meshing gear pump; the external gear 43 of the driving gear shaft 4 and the external gear 52 of the driven gear 5 are both in involute tooth form, the internal gear 53 of the driven gear 5 is a rotor pump external rotor molded line, and the external gear of the internal rotor 6 is a rotor pump internal rotor molded line.

As shown in fig. 9 to 11, the pump body 3 is provided with a driven gear cavity 304 for accommodating the driven gear 5, a driving gear cavity 302 for accommodating the driving gear shaft, and a pump body driving shaft hole 301 for supporting the driving gear shaft 4 to rotate, one side between the driven gear cavity 304 and the driving gear cavity 302 is provided with a gear pump oil inlet cavity 306, and the other side is provided with a gear pump oil outlet cavity 307; the lower part of the driven gear cavity 304 is also provided with a stepped shaft hole which is composed of a large hole section 303 and a small hole section 305, wherein the large hole section 303 provides a rotary support for the cylindrical part 51 of the driven gear 5, the small hole section 305 provides a support for the rotation of the inner rotor shaft assembly 6, and a rotor pump oil inlet cavity 309 and a rotor pump oil outlet cavity 310 are arranged on the stepped surface between the large hole section 303 and the small hole section 305.

As shown in fig. 12 to 15, a pump cover driving shaft hole 701, a gear pump auxiliary oil inlet cavity 703 and a gear pump auxiliary oil outlet cavity 705 are arranged on the inner end surface of the pump cover 7, a gear pump oil inlet 704 is arranged at a position on the pump cover 7 corresponding to the gear pump auxiliary oil inlet cavity 703, and a gear pump oil outlet 706 is arranged at a position on the pump cover 7 corresponding to the gear pump auxiliary oil outlet cavity 705; the inner end surface of the pump cover 7 is also provided with a rotor shaft hole 702, a rotor pump auxiliary oil inlet cavity 708 and a rotor pump auxiliary oil outlet cavity 709, a rotor pump oil inlet 711 is arranged at a position on the pump cover 7 corresponding to the rotor pump auxiliary oil inlet cavity 708, and a rotor pump oil outlet 712 is arranged at a position corresponding to the rotor pump auxiliary oil outlet cavity 709; the pump cover 7 is press-fitted with a positioning sleeve 713 in an interference manner, two ends of the positioning sleeve 713 are higher than two end surfaces of the pump cover 7, one end of the positioning sleeve 713 is used for installing and positioning the oil pump assembly to ensure the center distance of the transmission gear 1, and the other end of the positioning sleeve 713 is matched and positioned with two positioning sleeve holes 312 on the pump body 3 to ensure the coaxiality of the shaft holes on the pump body 3 and the pump cover 7.

As shown in fig. 9 and 12, in order to provide lubrication to both ends of the drive gear shaft 4 and the rotating shaft 62, a first lubricating oil groove 308 is provided between the gear pump-out oil chamber 307 and the pump body drive shaft hole 301; a second lubricating oil groove 311 is formed between the rotor pump-out oil cavity 310 and the stepped shaft hole; a third lubricating oil groove 707 is arranged between the gear pump auxiliary oil outlet cavity 705 and the pump cover driving shaft hole 701; a fourth lubricating oil groove 710 is arranged between the rotor pump auxiliary oil outlet cavity 709 and the rotor shaft hole 702.

In this embodiment, the outer rotor of the internal-meshing rotor pump is very skillfully integrated on the driven gear 5 of the gear pump, so that two independent oil pumps are formed, the number of parts of the two pumps is greatly reduced compared with that of a traditional series pump, and the volumes of the two oil pumps are hardly increased compared with that of a traditional single external-meshing involute gear pump. The two oil pumps can adjust respective theoretical discharge capacities, can provide two different pressures and oil simultaneously, can provide low-pressure lubricating and cooling oil by using one oil pump and provide high-pressure hydraulic pressure by using the other oil pump when applied to a pure electric vehicle or a hybrid electric vehicle, and solves the problem that a single oil pump needs to meet both hydraulic pressure and lubricating and cooling.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims (10)

1. The utility model provides an integrated form oil pump, includes pump body (3), pump cover (7), its characterized in that: install a driving gear axle (4), a driven gear (5) and an inner rotor shaft subassembly (6) in the cavity of the pump body (3), the periphery of driven gear (5) is equipped with external tooth (52), and its inner bore is equipped with internal tooth (53), inner rotor shaft subassembly (6) comprise inner rotor (61) and pivot (62), inner rotor (61) are arranged in the hole of driven gear (5) and constitute the internal gearing impeller pump with internal tooth (53) on driven gear (5), and external gearing impeller pump is constituteed with the external tooth of driving gear axle (4) in external tooth (52) of driven gear (5).

2. The integrated oil pump of claim 1, wherein: a driven gear cavity (304) for accommodating a driven gear, a driving gear cavity (302) for accommodating a driving gear shaft and a pump body driving shaft hole (301) for supporting the driving gear shaft (4) to rotate are formed in the pump body (3), a gear pump oil inlet cavity (306) is formed in one side between the driven gear cavity (304) and the driving gear cavity (302), and a gear pump oil outlet cavity (307) is formed in the other side; the lower part of the driven gear cavity (304) is also provided with a stepped shaft hole which consists of a large hole section (303) and a small hole section (305), wherein the large hole section (303) provides support for the rotation of the driven gear (5), the small hole section (305) provides support for the rotation of the inner rotor shaft assembly (6), and a rotor pump oil inlet cavity (309) and a rotor pump oil outlet cavity (310) are arranged on a stepped surface between the large hole section (303) and the small hole section (305).

3. The integrated oil pump of claim 2, wherein: a pump cover driving shaft hole (701), a gear pump auxiliary oil inlet cavity (703) and a gear pump auxiliary oil outlet cavity (705) are formed in the inner end face of the pump cover (7), a gear pump oil inlet (704) is formed in the position, corresponding to the gear pump auxiliary oil inlet cavity (703), on the pump cover (7), and a gear pump oil outlet (706) is formed in the position, corresponding to the gear pump auxiliary oil outlet cavity (705); the inner end face of the pump cover (7) is further provided with a rotor shaft hole (702), a rotor pump auxiliary oil inlet cavity (708) and a rotor pump auxiliary oil outlet cavity (709), a rotor pump oil inlet (711) is arranged at a position, corresponding to the rotor pump auxiliary oil inlet cavity (708), on the pump cover (7), and a rotor pump oil outlet (712) is arranged at a position, corresponding to the rotor pump auxiliary oil outlet cavity (709).

4. The integrated oil pump as set forth in any one of claims 1 to 3, wherein: the driving gear shaft (4) comprises a long shaft end (41), a short shaft end (42) and an external gear (43).

5. The integrated oil pump as set forth in any one of claims 1 to 3, wherein: and a cylindrical part (51) protruding outwards is arranged in the middle of the end face of one end of the driven gear (5), and the cylindrical part (51) is installed in a large hole section (303) of a stepped shaft hole of the pump body.

6. The integrated oil pump as set forth in any one of claims 1 to 3, wherein: the external gear (43) of the driving gear shaft (4) and the external gear (52) of the driven gear (5) are both in involute tooth form, the internal teeth (53) of the driven gear (5) are rotor pump outer rotor molded lines, and the external teeth of the inner rotor (61) are rotor pump inner rotor molded lines.

7. The integrated oil pump as set forth in any one of claims 1 to 3, wherein: the driving gear shaft (4) is formed by machining alloy steel, the driven gear (5) and the inner rotor (61) are formed by sintering powder metallurgy, and the rotating shaft (62) is pressed in a shaft hole of the inner rotor (61) in an interference mode.

8. The integrated oil pump as set forth in claim 2, wherein: a first lubricating oil groove (308) is arranged between the gear pump oil outlet cavity (307) and the pump body driving shaft hole (301); a second lubricating oil groove (311) is arranged between the rotor pump oil outlet cavity (310) and the stepped shaft hole.

9. The integrated oil pump of claim 3, wherein: a third lubricating oil groove (707) is arranged between the gear pump auxiliary oil outlet cavity (705) and the pump cover driving shaft hole (701); a fourth lubricating oil groove (710) is arranged between the auxiliary oil outlet cavity (709) of the rotor pump and the rotor shaft hole.

10. The integrated oil pump as set forth in claim 3, wherein: and the pump cover (7) is provided with a positioning sleeve (713), and two ends of the positioning sleeve (713) are higher than two end faces of the pump cover (7).

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