Cooling lubricating pump suitable for dry type oil pan

Abstract

The utility model relates to a cooling lubrication pump suitable for a dry type oil pan, which comprises a pressure oil pump and an oil scavenger pump which share a driving shaft, the pressure oil pump is arranged at the middle section of the driving shaft, the oil scavenger pump is arranged at one end of the driving shaft, and the oil scavenger pump comprises a pump shell and a driving gear arranged at the end part of the driving shaft. At least two driven gears meshed with the driving gear are arranged in the pump shell to form a plurality of independent gear pump sets, and each gear pump set is provided with an oil scavenger pump oil suction port and an oil scavenger pump oil outlet. According to the cooling lubricating pump, the oil suction pump and the oil return pump which are coaxial are arranged, so that the oil suction displacement of the oil return pump is far larger than the displacement of the pressure oil pump, the liquid level of a suction-dry type oil pan is low enough, oil in an oil storage tank is sufficient, the gas content of a suction inlet of the pressure oil pump is low, and an electric driving system is fully cooled and lubricated; the electric drive system can easily achieve lubricating oil collection and circulation, and the oil scavenger pump has the dry running capacity after air suction.

Description

Technical Field

[0001] The utility model relates to the field of cooling lubrication pumps of vehicle power systems, in particular to a cooling lubrication pump suitable for a dry oil sump. Background Art

[0002] When the electric drive system is running, the motor, gears, shafts and bearing components need to be cooled and lubricated. More and more electric drives use direct oil cooling. Conventional electric drive systems have an oil pan, which is filled with a certain amount of lubricating oil and an electronic oil pump is used to transport the lubricating oil to the required parts. However, this solution has some disadvantages: 1. The amount of oil is relatively high, and there is energy loss when the rotating parts stir the oil; 2. When the vehicle is tilted or passes a steep slope, the oil pump sucks empty air, resulting in insufficient cooling and lubrication; 3. The oil pan occupies a certain vertical space, which restricts the platform adaptation of the electric drive.

[0003] In order to solve the above problems, some electric drive systems adopt a dry sump solution, in which an oil storage tank is provided at a higher position in the drive system. An oil pump is required to collect oil into the oil storage tank, and then the lubricating oil in the oil storage tank is extracted by the oil pump and transported to the position in the electric drive system that requires cooling and lubrication.

[0004] The above cooling and lubrication scheme also has the following problems: it is difficult to ensure that the liquid level in the dry sump is low enough and that there is sufficient oil in the oil storage tank; when there is no oil in the dry sump, the return oil pump sucks empty and runs dry, and it is difficult to re-suck up the lubricating oil when there is oil. Utility Model Content

[0005] The purpose of the utility model is to provide a cooling lubrication pump suitable for a dry oil sump in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A cooling lubrication pump suitable for a dry oil sump comprises an oil pressure pump and an oil return pump which share a driving shaft, wherein the oil pressure pump is arranged in the middle section of the driving shaft and the oil return pump is arranged at one end of the driving shaft, the oil return pump comprises a pump housing and a driving gear arranged at the end of the driving shaft, at least two driven gears meshing with the driving gear are arranged in the pump housing to form a plurality of independent gear pump groups, and the gear pump groups all have an oil return pump oil suction port and an oil return pump oil outlet.

[0008] As a further optimization scheme of the utility model, the drive shaft is driven by a motor, wherein the motor includes a motor housing, a motor stator assembly and a motor rotor assembly, the pressure oil pump is a cycloidal rotor pump, including a pump body, the pump body is provided with a pressure oil pump oil outlet for leading to the cooling and lubricating oil circuit, the motor housing is provided with a pressure oil pump oil suction port connected to the pump body, the pressure oil pump oil suction port is used to connect to an oil storage tank, and when sucking oil, oil enters the motor housing to immerse the motor rotor assembly.

[0009] As a further optimization scheme of the utility model, an outer rotor is provided in the pump body, and an inner rotor matching with the outer rotor is provided on the drive shaft, and a first sleeve with a lubricating coating is provided at the matching position of the drive shaft and the motor housing.

[0010] As a further optimization scheme of the utility model, the motor also has a controller, which includes a controller housing, a controller cover, and a motor drive circuit board disposed in the controller housing, and the motor drive circuit board is immersed in the oil suction channel of the oil pressure pump through a pipeline connection.

[0011] As a further optimization solution of the utility model, the oil return pump suction port is used to communicate with the dry oil sump, and an oil filter is provided on the oil suction channel, and the oil return pump outlet is used to lead to the oil storage tank.

[0012] As a further optimization scheme of the utility model, the pump body and the pump casing are integrated, one end of the pump body is connected to the motor casing, one end of the pump casing has a detachable pump cover, and the driven gear is rotatably arranged between the pump casing and the pump cover through the driven gear shaft.

[0013] As a further optimization solution of the utility model, the driven gear shaft and the driven gear are fixedly connected, and two ends of the driven gear shaft form a rotating pair with the shaft holes on the pump housing and the pump cover respectively.

[0014] As a further optimization solution of the utility model, the driven gear shaft and the pump housing are interference fit, the driven gear shaft and the driven gear inner hole form a rotating pair, and the rotating pair is provided with a second sleeve with a lubricating coating.

[0015] As a further optimization solution of the utility model, the driving gear and the driven gear are made of one of metal materials, engineering plastics and engineering plastics with lubrication modification.

[0016] The beneficial effects of the utility model are:

[0017] The utility model arranges a coaxial oil suction pump and an oil return pump so that the oil suction displacement of the oil return pump is much greater than the oil pressure pump displacement, thereby ensuring that the liquid level of the dry oil sump is sufficiently low, the oil storage tank has sufficient oil, and the air content in the oil pressure pump suction port is low, so that the electric drive system is fully cooled and lubricated. The utility model has multiple oil suction ports, which facilitates the electric drive system to realize lubricating oil collection and circulation, and the oil return pump has the ability to run dry after being emptied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 2 It is a three-dimensional schematic diagram of the internal structure of the utility model;

[0020] Figure 3 This is a bottom sectional view of the oil return pump of the utility model;

[0021] Figure 4 It is a three-dimensional schematic diagram of the utility model;

[0022] Figure 5 It is a lubrication system suitable for the utility model;

[0023] In the figure: 100, lubrication pump; 110, motor; 111, controller cover; 112, motor drive circuit board; 113, controller housing; 114, motor housing; 115, rotor assembly; 116, stator assembly; 117, drive shaft; 118, first sleeve; 120, oil pressure pump; 121, outer rotor; 122, inner rotor; 123, pump body; 130, oil return pump; 131, driven gear; 132, second sleeve; 133, driven gear shaft; 134, driving gear; 135, pump cover; 136, pump housing; 200, oil storage tank; 300, dry oil sump; 400, cooling and lubricating oil circuit; 500, oil filter; P 1j , oil pump suction port; P 1c , oil pressure pump outlet; P 21j and P 22j , oil return pump suction port; P 21c and P 22c , oil return pump outlet. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] Example 1

[0026] like Figure 1-4 As shown, a cooling lubrication pump suitable for a dry oil sump includes a pressure oil pump 120 and a return oil pump 130 that share a driving shaft 117. The pressure oil pump 120 is placed in the middle section of the driving shaft 117, and the return oil pump 130 is placed at one end of the driving shaft 117. The return oil pump 130 includes a pump housing 136 and a driving gear 134 arranged at the end of the driving shaft 117. At least two driven gears 131 meshing with the driving gear 134 are arranged in the pump housing 136 to form a plurality of independent gear pump groups. The gear pump groups all have a return oil pump suction port P 21j , P 22j And the return oil pump outlet P 21c , P 22c .

[0027] This embodiment is provided with two driven gears 131, that is, forming two independent gear pump groups. The displacement of the return oil pump 130 is about twice that of the pressure oil pump 120. Excessive extraction can ensure that the oil storage tank 200 is sufficient, thereby reducing the gas content in the inlet of the pressure oil pump 120. The gear pump group is surrounded by the inner cavity of the pump housing 136 and the pump cover 135 to form a working cavity. When the driving gear 134 is Figure 4 When the viewing angle rotates clockwise, the two driven gears 131 rotate counterclockwise, and the oil Figure 3 The flow path indicated by the dotted arrows forms two low-pressure areas and two high-pressure areas to achieve oil suction and discharge.

[0028] The drive shaft 117 is driven by the motor 110, wherein the motor 110 is a brushless DC motor, the motor 110 includes a motor housing 114, a motor stator assembly 116 and a motor rotor assembly 115, a first sleeve 118 with a lubricating coating is provided at the mating position between the drive shaft 117 and the motor housing 114, the pressure oil pump 120 is a cycloid rotor pump, including a pump body 123, an outer rotor 121 is provided in the pump body 123, and an inner rotor 122 matched with the outer rotor 121 is provided on the drive shaft 117, and a pressure oil pump outlet P is provided on the pump body 123 of the pressure oil pump 120 2c The motor housing 114 is provided with an oil pump suction port P connected to the pump body 123. 1j The motor housing 114 is fixedly connected to one side of the pump body 123, and a connecting hole is provided at the connection so that the oil pump suction port P 1j The oil suction passage of the motor housing 114 is connected to the oil storage tank 200, and the motor rotor assembly 115 is immersed in the oil suction passage of the oil pressure pump 120. The motor 110 can be effectively cooled by the oil during operation. 2c Used to lead to the cooling lubricating oil circuit 400, the inner rotor 122 of the oil pressure pump 120 and the drive shaft 117 are interference fit to achieve torque transmission, and the cavity surrounded by the inner rotor 122, the outer rotor 121, the cavity on one side of the pump body 123, and the end face of the motor housing 117 periodically expands and shrinks to achieve oil transportation.

[0029] The motor 110 also has a controller, which includes a controller housing 113, a controller cover 111, and a motor drive circuit board 112 disposed in the controller housing 113. The motor drive circuit board 112 is immersed in the oil suction channel of the oil pressure pump 120 through a pipeline connection. The motor drive circuit board 112 is immersed in the oil after protective treatment. The temperature rise of the motor drive circuit board 112 can also be effectively suppressed, and it is beneficial for the lubrication pump to heat the lubricating oil when running at low temperature, reduce the viscosity of the oil, thereby reducing the load of the motor 110 and shortening the warm-up time at low temperatures.

[0030] The controller housing 113 is made of engineering plastic and has embedded conductor terminals, which serve to connect the three phases of the motor stator assembly 116 and the three-phase bridge of the motor drive circuit board 112. The motor stator assembly 116 has an interference fit with the motor housing 114, and the motor rotor assembly 115 has an interference fit with the drive shaft 117. The drive shaft 117 is supported by an axial hole set on the motor housing 114, and the axial hole is lubricated by oil from the oil pump 120.

[0031] The pump body 123 is integrated with the pump casing 136, one end of the pump body 123 is connected to the motor casing 114, one end of the pump casing 136 has a detachable pump cover 135, the driven gear 131 is rotatably arranged between the pump casing 136 and the pump cover 135 through the driven gear shaft 133, the driven gear shaft 133 and the driven gear 131 are fixedly connected, and the two ends of the driven gear shaft 133 respectively form a rotating pair with the axial holes on the pump casing 136 and the pump cover 135.

[0032] As another embodiment, the driven gear shaft 133 and the pump housing 136 are interference fit, and the driven gear shaft 133 and the inner hole of the driven gear 131 form a rotating pair, which is provided with a second sleeve 132 with a lubricating coating to adapt to long-term dry-suction grinding operation.

[0033] The driving gear 134 and the driven gear 131 are made of metal, engineering plastics, and engineering plastics with lubrication modification, which improves the dry grinding operation capability of the oil return pump 130 when cavitation occurs and can improve NVH performance.

[0034] A lubrication system using the lubrication pump 100 is as follows: Figure 5 As shown, the cooling lubricating oil circuit 400 flows through the automobile parts to be cooled and the relevant channels of the motor 110 as required, and the oil return pump suction port P 21j , P 22j It is used to connect to the dry oil sump 300, and an oil filter 500 is provided on the oil suction channel, and the oil return pump oil outlet P 21c , P 22c Used to access the oil storage tank 200.

[0035] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A cooling lubrication pump suitable for a dry oil sump, comprising an oil pressure pump (120) and an oil return pump (130) sharing a common drive shaft (117), characterized in that: The oil pressure pump (120) is disposed at the middle section of the drive shaft (117), and the oil return pump (130) is disposed at one end of the drive shaft (117). The oil return pump (130) comprises a pump housing (136) and a driving gear (134) disposed at the end of the drive shaft (117). At least two driven gears (131) meshing with the driving gear (134) are disposed in the pump housing (136) to form a plurality of independent gear pump groups. The gear pump groups all have an oil return pump suction port (P 21j , P 22j ) and the return oil pump outlet (P 21c , P 22c ).

2. A cooling lubrication pump suitable for a dry oil sump according to claim 1, characterized in that: The drive shaft (117) is driven by a motor (110), wherein the motor (110) comprises a motor housing (114), a motor stator assembly (116) and a motor rotor assembly (115); the oil pressure pump (120) is a cycloid rotor pump, comprising a pump body (123); the pump body (123) is provided with an oil pressure pump oil outlet (P123) for connecting to a cooling lubricating oil circuit (400); 2c ), the motor housing (114) is provided with an oil pressure pump suction port (P) connected to the pump body (123) 1j ), oil pump suction port (P 1j ) is used to connect to the oil storage tank (200) and allow oil to enter the motor housing (114) to immerse the motor rotor assembly (115) when sucking oil.

3. A cooling lubrication pump suitable for a dry oil sump according to claim 2, characterized in that: An outer rotor (121) is provided in the pump body (123), and an inner rotor (122) matched with the outer rotor (121) is provided on the drive shaft (117). A first shaft sleeve (118) with a lubricating coating is provided at the matching position between the drive shaft (117) and the motor housing (114).

4. A cooling lubrication pump suitable for a dry sump according to claim 2, characterized in that: The motor (110) further comprises a controller, which comprises a controller housing (113), a controller cover (111), and a motor drive circuit board (112) disposed inside the controller housing (113), and the motor drive circuit board (112) is immersed in the oil suction channel of the oil pressure pump (120) through a pipeline connection.

5. A cooling lubrication pump suitable for a dry sump according to claim 1, characterized in that: The oil return pump suction port (P 21j , P 22j ) is used to communicate with the dry oil sump (300), and an oil filter (500) is provided on the oil suction channel, and the oil return pump oil outlet (P 21c , P 22c ) is used to lead to the oil storage tank (200).

6. A cooling lubrication pump suitable for a dry oil sump according to claim 2, characterized in that: The pump body (123) and the pump casing (136) are integrally arranged. One end of the pump body (123) is connected to the motor casing (114). One end of the pump casing (136) is provided with a detachable pump cover (135). The driven gear (131) is rotatably arranged between the pump casing (136) and the pump cover (135) via a driven gear shaft (133).

7. A cooling lubrication pump suitable for a dry sump according to claim 6, characterized in that: The driven gear shaft (133) and the driven gear (131) are fixedly connected, and two ends of the driven gear shaft (133) respectively form a rotation pair with shaft holes on the pump housing (136) and the pump cover (135).

8. A cooling lubrication pump suitable for a dry oil sump according to claim 6, characterized in that: The driven gear shaft (133) and the pump housing (136) are interference fit, and the driven gear shaft (133) and the inner hole of the driven gear (131) form a rotating pair, and the rotating pair is provided with a second shaft sleeve (132) with a lubricating coating.

9. A cooling lubrication pump suitable for a dry oil sump according to any one of claims 1 to 8, characterized in that: The driving gear (134) and the driven gear (131) are made of one of metal materials, engineering plastics and engineering plastics with lubrication modification.

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