CN213743647U

CN213743647U - Pump device and vehicle

Info

Publication number: CN213743647U
Application number: CN202021899041.6U
Authority: CN
Inventors: 曹小军; 化豪爽; 徐一飞; 葛笑; 江波
Original assignee: Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Current assignee: Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-07-20
Anticipated expiration: 2030-09-03

Abstract

The embodiment of the utility model provides a pump unit and vehicle, wherein, the pump unit includes pump portion, motor portion, casing and bearing assembly, and motor portion includes the pivot of rotating around the central axis of motor portion, and the pivot contacts with pump portion and can drive pump portion to rotate; the shell is provided with a cavity for accommodating the pump part and the motor part; the bearing assembly is connected with the shell and sleeved on the rotating shaft, the bearing assembly comprises a first bearing and a second bearing, and the first bearing is provided with a first bearing surface close to the rotating shaft; the second bearing is arranged on one side, away from the motor part, of the first bearing, the pump part is arranged between the second bearing and the first bearing, the second bearing is provided with a second bearing surface close to the rotating shaft, and the axial height Bs of the second bearing surface is smaller than or equal to the axial height Bf of the first bearing surface. The rotating shaft is supported by the two sliding bearings, the clearance of the rotating shaft is small, the position degree of the axis of the rotating shaft can be controlled within a reasonable range, and the cost is reduced.

Description

Pump device and vehicle

Technical Field

The embodiment of the utility model provides a pump unit and vehicle are related to pump unit technical field particularly.

Background

In the prior art, there are generally two types of common structures that support a rotating shaft in a pump device. The first is to arrange a pair of rolling bearings at the outer side of the rotating shaft, but the form has larger downstream clearance and poorer position degree control on the shaft center of the rotating shaft; the second is to provide a sliding bearing along with a double rolling bearing outside the rotating shaft, but this form is expensive.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, an object of an embodiment of the present invention is to provide a pump apparatus.

It is another object of an embodiment of the present invention to provide a vehicle having the above pump device.

To achieve the above object, an embodiment of the first aspect of the present invention provides a pump device, including: pump portion, motor portion, casing and bearing assembly. The motor part comprises a rotating shaft rotating around the central axis of the motor part, and the rotating shaft is in contact with the pump part and can drive the pump part to rotate. The casing has the cavity, and the cavity is used for acceping pump portion and motor portion. The bearing assembly is connected with the shell and sleeved on the rotating shaft. The bearing assembly includes a first bearing having a first bearing surface adjacent the shaft and a second bearing. The second bearing is arranged on one side, away from the motor part, of the first bearing, the pump part is arranged between the second bearing and the first bearing, the second bearing is provided with a second bearing surface close to the rotating shaft, and the axial height Bs of the second bearing surface is smaller than or equal to the axial height Bf of the first bearing surface.

According to an embodiment of the pump device provided by the present invention, the pump device comprises a pump portion, a motor portion, a housing and a bearing assembly. The casing is provided with a cavity for accommodating the pump part and the motor part, namely the pump part and the motor part are arranged in the cavity. The motor part comprises a rotating shaft rotating around the central axis of the motor part, wherein the rotating shaft can be directly an output shaft of the motor part, or the rotating shaft can be a non-driving shaft of the motor part and is in transmission connection with the driving shaft. The pivot contacts with pumping the portion, and the pivot can drive pumping the portion and rotate, deserves to explain, pivot and pumping portion interference fit to realize the simultaneous movement of pivot and pumping portion. It will be appreciated that the motor section provides power to the pump section via the shaft.

Further, the bearing assembly includes a first bearing and a second bearing. Bearing assembly and casing are connected and the bearing assembly cover is established on the pivot, and first bearing and second bearing all are connected with the casing promptly, and the connected mode can be for dismantling the connection, certainly also can be fixed connection, and further, first bearing and second bearing can be with casing integrated into one piece, and first bearing and second bearing are slide bearing this moment, and slide bearing refers to the bearing of working under sliding friction. Because first bearing and second bearing all overlap and establish on the pivot, consequently first bearing and second bearing can play the effect of support to the pivot. The support here is lubricated support, the axle center coincidence of first bearing, second bearing and pivot, and in the course of the work, pivot drive pump portion rotates, therefore pump portion can exert a radial force to the pivot, and this radial force can promote the bearing to incline towards one side, first bearing and second bearing at this moment can play the effect of support to the pivot, with the play control of pivot in reasonable scope, can not be very big, also can control the position degree in pivot axle center simultaneously.

Compared with a double-rolling bearing mode, the sliding bearing is stable and reliable in operation and free of noise, the sliding surface is separated by lubricating oil and does not directly contact under the liquid lubrication condition, friction loss and surface abrasion can be greatly reduced, the lubricating oil is filled in the gap between the sliding bearing and the rotating shaft, the lubricating oil on the sliding surface can form a layer of oil film, fluid lubrication is achieved, the oil film also has certain vibration absorption capacity, and the service lives of the first bearing, the second bearing and the rotating shaft are prolonged. The two sliding bearings support the rotating shaft, the clearance of the rotating shaft is small, and the position degree of the axis of the rotating shaft can be controlled within a reasonable range; compared with the mode that the double-rolling bearing is matched with the sliding bearing, only two sliding bearings are used, so that the supporting structure can be simplified, and the cost can be reduced.

Further, the second bearing is arranged on a side of the first bearing away from the motor part, and it can be understood that the first bearing is closer to the motor part from the first bearing and the second bearing. The pump portion sets up between first bearing and second bearing, and first bearing and second bearing are located the axial both sides of pump portion respectively promptly, and in the course of the work, the pivot needs the drive pump portion to rotate, therefore the load of pivot is mainly concentrated in pump portion, and through the pivot, the cooperation of first bearing and second bearing is used, can be with the load that comes from pump portion by the pivot, first bearing and the three parts sharing of second bearing, can avoid long-time working process load to concentrate on the pivot to lead to the pivot to damage to a certain extent.

Further, the first bearing has a first bearing surface close to the rotating shaft, the second bearing has a second bearing surface close to the rotating shaft, and the axial height Bs of the second bearing surface is smaller than or equal to the axial height Bf of the first bearing surface, namely Bs is not larger than Bf. When the first bearing is equidistant from the pump section and the second bearing is equidistant from the pump section, the load from the pump section is equal on the first bearing and the second bearing. However, the first bearing is closer to the motor part than the second bearing, and during the rotation of the rotor in the motor part, a radial force is generated between the stator and the rotor, and a load is also generated on the rotating shaft, so that the first bearing also needs to bear the load from the motor part, and the first bearing and the second bearing are more suitable for the requirements of different loads at different positions of the rotating shaft by enabling the second bearing surface to be smaller than or equal to the first bearing surface, and the power consumption of the rotating shaft can be reduced to the lowest level on the premise of ensuring the lubrication reliability of the rotating shaft.

Additionally, the utility model provides an above-mentioned technical scheme can also have following additional technical characterstic:

in the above-described aspect, the sum (Bf + Bs) of the axial heights of the first bearing surface and the second bearing surface is equal to or greater than the axial height B of the pump portion.

In the technical scheme, Bf + Bs is larger than or equal to B, and the first bearing surface and the second bearing surface are large enough, so that the first bearing and the second bearing can share more loads, and the load applied to the rotating shaft by the pump part is reduced. And the first bearing and the second bearing are more reliable when supporting the rotating shaft, and cannot be damaged due to the undersize of the supporting surface.

In any of the above technical solutions, a ratio of an axial height Bf of the first bearing surface to a shaft diameter Df of the first bearing is greater than or equal to 1.25 and less than or equal to 1.38; and/or the ratio of the axial height Bs of the second bearing surface to the shaft diameter Ds of the second bearing is more than or equal to 1.13 and less than or equal to 1.38.

In the technical scheme, the bearing width-diameter ratio is more than or equal to 1.25 (Bf/Df) and less than or equal to 1.38, which can be obtained according to a relation graph of the first bearing width-diameter ratio and the oil film thickness, wherein the width-diameter ratio of the first bearing is positively correlated with the oil film thickness, and when the Bf/Df is more than or equal to 1.25, the oil film thickness formed at the first bearing surface is in a proper range, namely more than or equal to the minimum oil film thickness of fluid lubrication, namely 1.4 mu m, so that the lubrication reliability of the rotating shaft can be ensured, and the power consumption of the rotating shaft is reduced to the lowest level. In addition, Bf/Df is less than or equal to 1.38, the oil film thickness can be prevented from being too large, and when the oil film thickness exceeds 2 micrometers, although fluid lubrication can be met, the PV value is too large, and the power consumption of the bearing is increased. Under the condition of considering both lubrication and power consumption, the width-diameter ratio of the first bearing meets the relation, and the requirements of both lubrication and power consumption can be well balanced.

Further, the bearing width-diameter ratio is more than or equal to 1.13 (Bs/Ds) and less than or equal to 1.38, which can be obtained according to a relation graph of the second bearing width-diameter ratio and the oil film thickness, the width-diameter ratio of the second bearing is positively correlated with the oil film thickness, and when the Bs/Ds is more than or equal to 1.13, the oil film thickness formed on the second bearing surface is in a proper range, namely more than or equal to the minimum oil film thickness of fluid lubrication, namely more than or equal to 1.4 mu m, so that the lubrication reliability of the rotating shaft can be ensured, and the power consumption of the rotating shaft is reduced to. In addition, Bs/Ds is less than or equal to 1.38, so that the oil film thickness can be prevented from being too large, and when the oil film thickness exceeds 2 micrometers, although fluid lubrication can be met, the PV value is too large, and the power consumption of the bearing is increased. Under the condition of considering both lubrication and power consumption, the width-diameter ratio of the second bearing meets the relation formula, so that the requirements of both lubrication and power consumption can be well balanced.

Specifically, the load of the pump part is applied to the rotating shaft, the pressure generated by the rotating shaft on the bearing is P, the rotating speed of the rotating shaft is V, the PV value is related to the height of the bearing, and in terms of calculation, the thicker the oil film thickness is, the higher the bearing height is, the PV value is increased, and the power consumption of the bearing is increased.

In any of the above technical solutions, the shaft diameter Df of the first bearing is greater than or equal to 6mm and less than or equal to 12 mm; the shaft diameter Ds of the second bearing is more than or equal to 6mm and less than or equal to 12 mm.

In the technical scheme, the relation graph of the shaft diameter of the bearing (the first bearing and the second bearing) and the deformation of the bearing and the relation graph of the shaft diameter of the bearing and the power consumption can be compared to show that when the shaft diameter is less than 6mm, the deformation of the bearing is large, and the bearing is not beneficial to supporting the rotating shaft; when the shaft diameter is larger than 12mm, the power consumption of the bearing is increased greatly, so that the shaft diameter of the first bearing meets Df which is more than or equal to 6mm and is less than or equal to 12mm, and the shaft diameter of the first bearing meets Ds which is more than or equal to 6mm and is less than or equal to 12mm, so that the power consumption requirement of the bearing is met, and the bearing can be prevented from being deformed too much.

In any of the above technical solutions, a part of the inner side wall of the first bearing is recessed away from the rotating shaft to form a first lubrication groove; and/or a part of the inner side wall of the second bearing is recessed away from the rotating shaft to form a second lubricating groove.

In this technical scheme, first lubrication groove is formed by a part of the inside wall of first bearing deviating from the recessed structure of the pivot, and second lubrication groove is formed by a part of the inside wall of second bearing deviating from the recessed structure of the pivot. Can fill and save fluid in first lubrication groove and the second lubrication groove, along with the pivot rotates, fluid in first lubrication groove and the second lubrication groove coats in the pivot to lubricate the inner wall of first bearing and second bearing, further ensure the reliable lubricity between pivot and the bearing, and ensure to satisfy fluid lubrication's minimum oil film thickness between bearing and the pivot. It is worth mentioning that the first lubrication groove is arranged on the first bearing in an axial direction. Further, the number of the first lubrication grooves is at least one. Further, a first lubrication groove may be provided only on the first bearing, and a second lubrication groove may not be provided on the second bearing; or the first bearing is not provided with the first lubricating groove, and only the second bearing is provided with the second lubricating groove; or the first bearing is provided with a first lubricating groove, and the second bearing is provided with a second lubricating groove, so that the bearing can be flexibly arranged according to actual requirements.

In any one of the above technical solutions, the pump portion includes: the first rotating piece is matched with the rotating shaft; the second rotates the piece, sets up the first rotation piece outside, and the first rotation piece can drive the second and rotate the piece and rotate, and the second rotates the piece and constructs the compression chamber with the first rotation piece, and the compression chamber includes first pressure chamber and second pressure chamber, and first lubrication groove and/or second lubrication groove and first pressure chamber intercommunication.

In this technical scheme, pump portion includes first rotation piece and second rotation piece, and first rotation piece cooperatees with the pivot, and the second rotation piece is located the outside of first rotation piece, and first rotation piece can drive the second rotation piece and rotate, and the pivot can drive the second rotation piece through first rotation piece and rotate promptly.

Further, the first rotating member and the second rotating member configure a compression chamber including a first pressure chamber and a second pressure chamber, and the first lubrication groove and/or the second lubrication groove communicate with the first pressure chamber. It is to be understood that the first and/or second lubrication groove is arranged in correspondence with the first pressure chamber. Namely, the first lubrication groove is formed in the first bearing at a position corresponding to the high pressure side of the pump portion, and the first lubrication groove is formed in the non-pressure bearing surface of the first bearing. Similarly, a second lubrication groove is formed in the second bearing at a position corresponding to the high pressure side of the pump portion, and the second lubrication groove is formed in the non-pressure bearing surface of the second bearing. High-pressure oil in the first pressure cavity can be pressed into the lubricating groove more easily, a layer of oil film is formed on the sliding surface, and the lubricating performance between the bearing and the rotating shaft is improved.

It is worth mentioning that the pressure to which the first pressure chamber is subjected is larger than the pressure to which the second pressure chamber is subjected.

Further, the first lubrication groove communicates with the first pressure chamber through a high-pressure throttle groove. The high-pressure throttling groove is formed in the end face, close to the pump portion, of the first bearing, and on one hand, the high-pressure throttling groove can ensure that high-pressure lubricating oil in the first pressure cavity flows into the first lubricating groove, so that the flow rate of the lubricating oil in the first lubricating groove meets the fluid lubricating requirement; on the other hand, the high-pressure throttling groove can prevent the high-pressure lubricating oil in the first pressure cavity from leaking into the first lubricating groove too much to influence the displacement of the pump part.

Furthermore, the second lubricating groove can be of a blind hole structure, and the oil in the second lubricating groove flows to the second lubricating groove from the first pressure cavity through an oil film gap between the second bearing and the pump part; the second lubrication groove may be a through hole, and the oil in the oil sump may directly flow into the second lubrication groove.

In any of the above aspects, the housing comprises: and the shell is arranged around the outer sides of the motor part and the pump part and is connected with the first bearing. The pump cover is connected to the casing, the pump cover and the casing form a cavity, and the second bearing and the pump cover are of an integrated structure.

In the technical scheme, the shell comprises a shell and a pump cover. The casing is arranged around the outer sides of the motor part and the pump part and connected with the first bearing in a detachable or fixed mode, and further the casing and the first bearing can be an integrated mechanism and are high in connection strength.

In addition, the pump cover is connected on the casing, and the pump cover forms the cavity with the casing, and second bearing and pump cover formula structure as an organic whole, second bearing and pump cover integrated into one piece have promptly saved more high spaces, not only can reduce the complete machine height, can also reduce cost.

In any of the above technical solutions, the housing and the first bearing are an integrated structure.

In this technical scheme, casing and first bearing integrated into one piece, compare in the mode of post-processing, joint strength is higher, can also save space, reduces the complete machine height, can reduce the degree of difficulty of preparation technology moreover, reduces the cost of manufacture.

In any of the above technical solutions, the first bearing is connected to the casing and divides the cavity into a motor cavity and a pump cavity; the pump device further comprises: and the sealing element is connected to the first bearing and positioned in the motor cavity, and the sealing element is sleeved on the rotating shaft.

In the technical scheme, the first bearing is connected with the shell and divides the cavity into the motor cavity and the pump cavity, so that the space arrangement is more reasonable. The pump device further comprises a sealing element, the sealing element is connected to the first bearing and located in the motor cavity, and the sealing element is sleeved on the rotating shaft. Further, the sealing element here is the oil blanket, separates motor chamber and pump chamber with the cavity through the oil blanket for working medium (lubricating oil) can not flow into the motor intracavity, can not influence the normal use of parts such as stator, rotor, control panel in the motor chamber, need not additionally set up other structures in order to guarantee that the spare part in the motor chamber receives the corruption in the motor chamber, makes pump device's sealing performance better, and the structure is simpler simultaneously, is favorable to reduce cost.

In any of the above solutions, a portion of the first bearing extends away from the pump section to form a mounting location in which the seal is disposed.

In this technical scheme, a part of first bearing deviates from pump portion and extends in order to construct the installation position to the installation position is integrated into one piece with first bearing, compares in the mode of post-processing, and joint strength is bigger. The mounting position for mounting the sealing element is formed by one part of the first bearing, so that the mounting accuracy of the sealing element can be ensured, and the bearing is simple to assemble, good in sealing performance and low in cost.

In any of the above technical solutions, the shaft hole of the second bearing is a through hole that penetrates axially; a portion of the pump cover extends away from the pump portion to construct an extension portion, the extension portion is used for forming an oil pool, and the through hole is used for communicating the oil pool.

In this technical scheme, the shaft hole of second bearing is the axial through-hole of seting up, the extension deviates from pump portion by a part of pump cover and extends the structure and form, and the extension forms the oil bath, oil bath storage lubricating oil, the through-hole is used for communicateing the oil bath, thereby fluid in the oil bath can enter into the clearance between second bearing and the pivot, in the second lubrication groove, fluid forms the one deck oil film and plays the lubrication action, later fluid is by the pumping thrust oil groove with the lubricated contact surface between first rotor (internal gear) and the pump cover, reveal the low-pressure region again through the clearance, fluid can flow to the direction that is close to the pump portion along the second lubrication groove on the second bearing, the reason has two, one is that the second lubrication groove soaks in the oil bath, another is that the thrust oil groove has the function of extraction fluid.

In the above technical solution, the pump device further includes: the oil inlet is axially arranged on the pump cover and/or the second bearing, one end of the oil inlet is communicated with the oil pool, and the other end of the oil inlet is communicated with the second pressure cavity of the pump part; and the oil outlet is radially arranged on the pump cover and the second bearing and is communicated with the first pressure cavity of the pump part.

In the technical scheme, the pump device further comprises an oil inlet and an oil outlet. The oil inlet is axially arranged on the pump cover and/or the second bearing, and two ends of the oil inlet are respectively communicated with the oil pool and the second pressure cavity of the pump part, so that oil flows out of the oil pool and flows into the second pressure cavity through the oil inlet.

Furthermore, the oil outlet is radially arranged on the pump cover and the second bearing, the oil outlet is communicated with the high pressure of the pump portion, oil liquid in the pump portion enters the second pressure cavity from the oil inlet, then flows into the first pressure cavity and flows out from the oil outlet, meanwhile, part of the oil liquid in the first pressure cavity can enter the first lubricating groove and/or the second lubricating groove, and therefore fluid lubrication is conducted on the first bearing, the second bearing and the rotating shaft.

In any of the above technical solutions, the rotating shaft includes a first shaft section and a second shaft section connected to each other, the first shaft section is sleeved with the first bearing, the second shaft section is sleeved with the second bearing, and a shaft diameter of the first shaft section is greater than or equal to a shaft diameter of the second shaft section.

In the technical scheme, the first shaft section is connected with the second shaft section, the first bearing is sleeved on the first shaft section, the second bearing is sleeved on the second shaft section, and the shaft diameter of the first shaft section is larger than or equal to that of the second shaft section. It can be understood that the pivot can be for the constant diameter of axle, also can be for big small axle setting, and wherein, motor portion and first bearing cover are established on the great first shaft section of diameter of axle, and pump portion and second bearing cover are established on the less second shaft section of diameter of axle to the pivot can adapt to the demand of different loads, and the structure is more nimble.

In any one of the above technical solutions, the motor part further includes: the rotor is connected with the rotating shaft; the stator is sleeved on the outer side of the rotor and comprises a stator core and a stator winding, and the stator winding is arranged on the stator core; the pump device further comprises: the control part is arranged on one side, deviating from the pump part, of the motor part, the control part is connected to the shell and located in the cavity, and the end part of the stator winding is electrically connected with the control part.

In this technical solution, the motor part further includes a rotor and a stator. Wherein, rotor and pivot link to each other, can ground, and rotor and pivot can coaxial setting, and the cooperation mode of rotor and pivot can be interference fit, can also ground, but rotor and pivot disalignment set up but both transmission are connected, carry out nimble setting according to actual conditions. The stator sleeve is arranged on the outer side of the rotor, the stator comprises a stator core and a stator winding, and the stator winding is arranged on the stator core. The principle of the motor part is that an electrified coil is stressed to rotate in a magnetic field, and electric energy is converted into mechanical energy.

In addition, pump unit still includes control part, and control part sets up the one side that deviates from pump portion at motor part, and control part setting is kept away from the position of pump portion at motor part promptly, because the position vibration that is close to pump portion in the course of the work is comparatively obvious, and the load that receives is great, therefore control part keeps away from pump portion, can play the effect of protection to control part to a certain extent, improves control part's life.

Furthermore, the control part is connected to the shell and located in the cavity, the end part of the stator winding is electrically connected with the control part, the stator winding is generally a copper wire, in the working process, the control part is used for electrifying the stator winding, then the stator generates a magnetic field, the rotor is driven to rotate, and the electric energy is converted into mechanical energy.

An embodiment of the second aspect of the present invention provides a vehicle, including: the pump apparatus of any of the above embodiments.

According to the utility model discloses an embodiment of vehicle, including the pump unit, further, the vehicle can be special type vehicle, and the vehicle has all advantages of pump unit.

In the above technical solution, a vehicle includes: a vehicle body in which the pump device is disposed; and the engine is arranged in the vehicle body and comprises a mounting seat, and the mounting seat is connected with the extension part of the pump device.

In this technical solution, a vehicle includes a vehicle body and an engine. The pump device and the engine are both arranged in the vehicle body, the engine comprises a mounting seat, and the mounting seat is connected with the extension part of the pump device, so that the engine and the pump device can be connected through the matching of the mounting seat and the extension part.

The vehicle includes any one of the pump devices in the first aspect, so that the beneficial effects of any one of the embodiments are achieved, and are not described herein again.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

Fig. 1 shows a schematic structural view of a pump device according to an embodiment of the invention;

fig. 2 shows a schematic view of a connection structure of a pump cover and a second bearing according to an embodiment of the present invention;

figure 3 shows a plot of width to diameter ratio versus oil film thickness for a first bearing according to an embodiment of the present invention;

FIG. 4 illustrates a plot of width to diameter ratio versus oil film thickness for a second bearing according to an embodiment of the present invention;

FIG. 5 illustrates a relationship diagram of shaft diameter, deflection, bearing power consumption of a bearing in a bearing assembly according to an embodiment of the present invention;

fig. 6 shows a schematic structural diagram of a vehicle according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

100 of the pump means,

a 110 pump section, a 111 first rotating member, a 112 second rotating member, a 113 compression chamber, a 114 first pressure chamber, a 115 second pressure chamber,

120 motor part, 121 rotating shaft, 121a first shaft section, 121b second shaft section, 122 rotor, 123 stator,

130 casing, 131 casing, 132 pump cover, 132a extension, 133 oil pool,

140 of the cavity body, and a plurality of the cavities,

150 of the bearing assembly, and a bearing assembly,

151 first bearing, 151a first bearing surface,

152, 152a second bearing surface,

161 a first lubrication groove, 162 a second lubrication groove,

170, a seal, 171 a mounting location,

180 the oil inlet is arranged at the position of the oil inlet,

190 of the oil outlet port and a water outlet port,

200 of the vehicles are driven by the motor vehicle,

210 of the vehicle body, and a vehicle body,

220 motor, 221 mounting seat.

Detailed Description

In order to make the above objects, features and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, embodiments of the present invention may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

A pump device 100 and a vehicle 200 provided according to some embodiments of the present invention are described below with reference to fig. 1 to 6.

Example one

An embodiment of the first aspect of the present invention provides a pump apparatus 100, as shown in fig. 1 and 2, including: pump section 110, motor section 120, housing 130, and bearing assembly 150. The motor part 120 includes a rotating shaft 121 rotating around a central axis of the motor part 120, and the rotating shaft 121 contacts the pump part 110 and can drive the pump part 110 to rotate. The housing 130 has a cavity 140, and the cavity 140 is used for accommodating the pump section 110 and the motor section 120. The bearing assembly 150 is connected to the housing 130 and is disposed on the shaft 121. The bearing assembly 150 includes a first bearing 151 and a second bearing 152, and the first bearing 151 has a first bearing surface 151a adjacent to the rotation shaft 121. The second bearing 152 is disposed on a side of the first bearing 151 facing away from the motor unit 120, the pump unit 110 is disposed between the second bearing 152 and the first bearing 151, the second bearing 152 has a second bearing surface 152a close to the rotating shaft 121, and an axial height Bs of the second bearing surface 152a is equal to or less than an axial height Bf of the first bearing surface 151 a.

According to an embodiment of the pump device 100 provided by the present invention, the pump device 100 comprises a pump portion 110, a motor portion 120, a housing 130 and a bearing assembly 150. Specifically, the pump device 100 is an oil pump. Specifically, the oil pump is an electronic oil pump. The casing 130 has a cavity 140, and the cavity 140 is used for accommodating the pump portion 110 and the motor portion 120, that is, the pump portion 110 and the motor portion 120 are disposed in the cavity 140. The motor part 120 includes a rotating shaft 121 rotating around the central axis of the motor part 120, where the rotating shaft 121 may be an output shaft of the motor part 120 directly, or alternatively, the rotating shaft 121 is a non-driving shaft of the motor part 120, but is in transmission connection with the driving shaft. The rotating shaft 121 is in contact with the pump portion 110, and the rotating shaft 121 can drive the pump portion 110 to rotate, and it should be noted that the rotating shaft 121 and the pump portion 110 are in interference fit, so that synchronous motion of the rotating shaft 121 and the pump portion 110 is achieved. It can be understood that the motor part 120 provides power to the pump part 110 through the rotating shaft 121.

Further, the bearing assembly 150 includes a first bearing 151 and a second bearing 152. The bearing assembly 150 is connected to the housing 130 and the bearing assembly 150 is sleeved on the rotating shaft 121, that is, the first bearing 151 and the second bearing 152 are both connected to the housing 130, and the connection mode may be detachable connection, and certainly may also be fixed connection, further, the first bearing 151 and the second bearing 152 may be integrally formed with the housing 130, at this time, the first bearing 151 and the second bearing 152 are both sliding bearings, and the sliding bearings refer to bearings working under sliding friction. Because the first bearing 151 and the second bearing 152 are both sleeved on the rotating shaft 121, the first bearing 151 and the second bearing 152 can support the rotating shaft 121. The support is a lubrication support, the axes of the first bearing 151, the second bearing 152 and the rotating shaft 121 coincide, and during operation, the rotating shaft 121 drives the pump part 110 to rotate, so that the pump part 110 can apply a radial force to the rotating shaft 121, and the radial force can push the bearings to deflect towards one side, at this time, the first bearing 151 and the second bearing 152 can play a role in supporting the rotating shaft 121, the play of the rotating shaft 121 is controlled within a reasonable range, and is not large, and meanwhile, the position degree of the axis of the rotating shaft 121 can also be controlled.

Specifically, the first bearing 151 and the second bearing 152 are sliding bearings. Compared with a double-rolling bearing mode, the sliding bearing is stable and reliable in operation and free of noise, the sliding surface is separated by lubricating oil and is not in direct contact under the liquid lubrication condition, friction loss and surface abrasion can be greatly reduced, the lubricating oil is filled in the gap between the sliding bearing and the rotating shaft 121, the lubricating oil on the sliding surface can form a layer of oil film, fluid lubrication is achieved, the oil film also has certain vibration absorption capacity, and the service lives of the first bearing 151, the second bearing 152 and the rotating shaft 121 are prolonged. The two sliding bearings support the rotating shaft 121, the play of the rotating shaft 121 is small, and the position degree of the axis of the rotating shaft 121 can be controlled within a reasonable range; compared with the form that the double-rolling bearing and the sliding bearing are matched for use, the embodiment only uses two sliding bearings, so that the supporting structure can be simplified, and the cost can be reduced.

Further, the second bearing 152 is disposed on a side of the first bearing 151 facing away from the motor part 120, and it is understood that, of the first bearing 151 and the second bearing 152, the first bearing 151 is closer to the motor part 120. The pump part 110 is arranged between the first bearing 151 and the second bearing 152, that is, the first bearing 151 and the second bearing 152 are respectively located at two sides of the axial direction of the pump part 110, during the operation, the rotating shaft 121 needs to drive the pump part 110 to rotate, so that the load of the rotating shaft 121 is mainly concentrated on the pump part 110, and through the cooperation of the rotating shaft 121, the first bearing 151 and the second bearing 152, the load from the pump part 110 can be shared by the rotating shaft 121, the first bearing 151 and the second bearing 152, and the damage of the rotating shaft 121 caused by the load concentrated on the rotating shaft 121 during the long-time operation can be avoided to a certain extent.

Further, the first bearing 151 has a first bearing surface 151a close to the rotation shaft 121, the second bearing 152 has a second bearing surface 152a close to the rotation shaft 121, and an axial height Bs of the second bearing surface 152a is equal to or less than an axial height Bf of the first bearing surface 151a, that is, Bs is not greater than Bf. When the first bearing 151 is equidistant from the pump section 110 and the second bearing 152 is equidistant from the pump section 110, the loads from the pump section 110 carried on the first bearing 151 and the second bearing 152 are equal. However, since the first bearing 151 is closer to the motor portion 120 than the second bearing 152, during the rotation of the rotor 122 in the motor portion 120, a radial force is generated between the stator 123 and the rotor 122, which also generates a load on the rotating shaft 121, and therefore, the first bearing 151 also needs to bear the load from the motor portion 120, and by making the second bearing surface 152a less than or equal to the first bearing surface 151a, the first bearing 151 and the second bearing 152 are more suitable for the requirements of different loads at different positions of the rotating shaft 121, and the power consumption of the rotating shaft 121 can be reduced to the minimum level on the premise of ensuring the lubrication reliability of the rotating shaft 121.

Further, as shown in fig. 1, the sum (Bf + Bs) of the axial heights of the first bearing surface 151a and the second bearing surface 152a is equal to or greater than the axial height B of the pump section 110.

In this embodiment, Bf + Bs ≧ B, and the first bearing surface 151a and the second bearing surface 152a are large enough to allow the first bearing 151 and the second bearing 152 to share more load, reducing the load applied to the shaft 121 by the pump section 110. Moreover, the first bearing 151 and the second bearing 152 can be more reliable when supporting the rotating shaft 121, and cannot be damaged due to the fact that the supporting surfaces are too small.

Further, as shown in fig. 3 and 4, the ratio of the axial height Bf of the first bearing surface 151a to the shaft diameter Df of the first bearing 151 is 1.25 or more and 1.38 or less; and/or the ratio of the axial height Bs of the second bearing surface 152a to the shaft diameter Ds of the second bearing 152 is 1.13 or more and 1.38 or less.

In this embodiment, as shown in FIG. 3, 1.25 ≦ (Bf/Df) ≦ 1.38, which can be obtained from the relationship between the aspect ratio of the first bearing 151 and the oil film thickness, the aspect ratio of the first bearing 151 is positively correlated to the oil film thickness, and when Bf/Df ≧ 1.25, the oil film thickness formed at the first bearing surface 151a is in a suitable range, i.e., greater than or equal to 1.4 μm, which is the minimum oil film thickness for fluid lubrication, so that the lubrication reliability of the rotating shaft 121 can be ensured, and the power consumption of the rotating shaft 121 can be reduced to the minimum level. In addition, Bf/Df is less than or equal to 1.38, the oil film thickness can be prevented from being too large, and when the oil film thickness exceeds 2 micrometers, although fluid lubrication can be met, the PV value is too large, and the power consumption of the bearing is increased. When the aspect ratio of the first bearing 151 satisfies the above relation in consideration of both lubrication and power consumption, the requirements of both lubrication and power consumption can be well balanced.

Further, as shown in FIG. 4, 1.13 ≦ (Bs/Ds) ≦ 1.38, which can be obtained from a graph of the aspect ratio of the second bearing 152 and the oil film thickness, the aspect ratio of the second bearing 152 is positively correlated to the oil film thickness, and when Bs/Ds ≥ 1.13, the oil film thickness formed at the second bearing surface 152a is in a suitable range, i.e. greater than or equal to 1.4 μm of the minimum oil film thickness for fluid lubrication, so that the lubrication reliability of the rotating shaft 121 can be ensured, and the power consumption of the rotating shaft 121 can be reduced to the lowest level. In addition, Bs/Ds is less than or equal to 1.38, so that the oil film thickness can be prevented from being too large, and when the oil film thickness exceeds 2 micrometers, although fluid lubrication can be met, the PV value is too large, and the power consumption of the bearing is increased. In consideration of both lubrication and power consumption, the width-to-diameter ratio of the second bearing 152 satisfies the above relation, so that the requirements of both lubrication and power consumption can be well balanced.

Specifically, the load of the pump section 110 is applied to the rotating shaft 121, the pressure generated by the rotating shaft 121 on the bearing is P, the rotating speed of the rotating shaft 121 is V, and the PV value is related to the height of the bearing.

Further, as shown in fig. 5, the shaft diameter Df of the first bearing 151 is 6mm or more and 12mm or less; the shaft diameter Ds of the second bearing 152 is 6mm or more and 12mm or less.

In this embodiment, as can be seen from the relationship diagram between the shaft diameter of the bearing (the first bearing 151 and the second bearing 152) and the deformation of the bearing, and the relationship diagram between the shaft diameter of the bearing and the power consumption, when the shaft diameter is smaller than 6mm, the deformation of the bearing is large, which is not beneficial to the support of the bearing on the rotating shaft 121; when the shaft diameter is larger than 12mm, the power consumption of the bearing is increased greatly, so that the shaft diameter of the first bearing 151 meets Df which is more than or equal to 6mm and less than or equal to 12mm, and the shaft diameter of the first bearing 151 meets Ds which is more than or equal to 6mm and less than or equal to 12mm, the power consumption requirement of the bearing is met, and the bearing can be prevented from being deformed too much.

Example two

On the basis of the first embodiment, the present embodiment further describes the lubrication structure of the first bearing 151 and/or the second bearing 152.

As shown in fig. 1 and 2, the pump apparatus 100 includes a pump portion 110, a motor portion 120, a housing 130, and a bearing assembly 150. The motor part 120 includes a rotating shaft 121 rotating around a central axis of the motor part 120, and the rotating shaft 121 contacts the pump part 110 and can drive the pump part 110 to rotate. The housing 130 has a cavity 140, and the cavity 140 is used for accommodating the pump section 110 and the motor section 120. The bearing assembly 150 is connected to the housing 130 and is disposed on the shaft 121. The bearing assembly 150 includes a first bearing 151 and a second bearing 152, and the first bearing 151 has a first bearing surface 151a adjacent to the rotation shaft 121. The second bearing 152 is disposed on a side of the first bearing 151 facing away from the motor unit 120, the pump unit 110 is disposed between the second bearing 152 and the first bearing 151, the second bearing 152 has a second bearing surface 152a close to the rotating shaft 121, and an axial height Bs of the second bearing surface 152a is equal to or less than an axial height Bf of the first bearing surface 151 a.

Further, a part of the inner sidewall of the first bearing 151 is recessed away from the rotating shaft 121 to form a first lubrication groove 161; and/or a portion of the inner sidewall of the second bearing 152 is recessed away from the shaft 121 to form a second lubrication groove 162.

In this embodiment, the first lubrication groove 161 is formed by a portion of the inner side wall of the first bearing 151 recessed away from the rotational shaft 121, and the second lubrication groove 162 is formed by a portion of the inner side wall of the second bearing 152 recessed away from the rotational shaft 121. The first and

second lubrication grooves

161 and 162 may be filled with and store oil, and as the rotating shaft 121 rotates, the oil in the first and

second lubrication grooves

161 and 162 is applied to the rotating shaft 121, so as to lubricate the inner walls of the first and

second bearings

151 and 152, further ensure reliable lubrication between the rotating shaft 121 and the bearings, and ensure a minimum oil film thickness between the bearings and the rotating shaft 121 to satisfy fluid lubrication. It is noted that the first lubrication groove 161 is axially provided through the first bearing 151. Further, the number of the first lubrication grooves 161 is at least one.

Further, the first lubrication groove 161 may be provided only on the first bearing 151, and the second lubrication groove 162 may not be provided on the second bearing 152; alternatively, the first bearing 151 is not provided with the first lubrication groove 161, and only the second bearing 152 is provided with the second lubrication groove 162; or the first bearing 151 is provided with a first lubrication groove 161, and the second bearing 152 is provided with a second lubrication groove 162, which can be flexibly arranged according to actual requirements.

Further, a first oil groove is provided on a first end surface of the first bearing 151 facing the pump section 110, and the first oil groove communicates with the first pressure chamber 114. The first oil groove may balance the pressure between the respective chambers in the high pressure side of the pump part 110 so that the pressure in the respective chambers in the high pressure side is similar, thereby reducing noise and mechanical vibration during operation.

Further, the pump device 100 further includes a throttle groove provided on the first end surface, the throttle groove communicating the first oil groove and the first lubrication groove 161. In order to ensure the fluid lubrication performance between the first bearing 151 and the rotating shaft 121, that is, to provide sufficient lubricating oil to the gap between the first bearing 151 and the rotating shaft 121, and to ensure that the displacement of the pump portion 110 does not leak seriously, that is, the displacement is not significantly affected by the oil used for lubrication, the first oil groove and the throttling groove are used in cooperation, so that the lubrication requirement between the first bearing 151 and the rotating shaft 121 can be met, and the displacement of the pump device 100 is not reduced due to the excessive flow in the first lubricating groove 161.

EXAMPLE III

In addition to the first and second embodiments, the specific structure of the pump section 110 in this embodiment is described, and further, the pump section 110 includes: the first rotating part 111, the first rotating part 111 cooperates with spindle 121; the second rotating member 112 is disposed outside the first rotating member 111, the first rotating member 111 can drive the second rotating member 112 to rotate, the second rotating member 112 and the first rotating member 111 form a compression chamber 113, the compression chamber 113 includes a first pressure chamber 114 and a second pressure chamber 115, and the first lubrication groove 161 and/or the second lubrication groove 162 are/is communicated with the first pressure chamber 114.

In this embodiment, the pump portion 110 includes a first rotating member 111 and a second rotating member 112, the first rotating member 111 is engaged with the rotating shaft 121, the second rotating member 112 is disposed outside the first rotating member 111, and the first rotating member 111 can drive the second rotating member 112 to rotate, that is, the rotating shaft 121 can drive the second rotating member 112 to rotate through the first rotating member 111.

Further, the first rotating member 111 and the second rotating member 112 configure a compression chamber 113, the compression chamber 113 includes a first pressure chamber 114 and a second pressure chamber 115, and the first lubrication groove 161 and/or the second lubrication groove 162 communicates with the first pressure chamber 114. It is understood that the first lubrication groove 161 and/or the second lubrication groove 162 are disposed corresponding to the first pressure chamber 114. That is, the first lubrication groove 161 is opened at a position corresponding to the high pressure side of the pump section 110 on the first bearing 151, and the first lubrication groove 161 is opened on the non-pressure receiving surface of the first bearing 151. Similarly, a second lubrication groove 162 is opened in the second bearing 152 at a position corresponding to the high pressure side of the pump section 110, and the second lubrication groove 162 is opened in the non-pressure-bearing surface of the second bearing 152. The high-pressure oil in the first pressure chamber 114 can be more easily pressed into the lubrication groove, and a layer of oil film is formed on the sliding surface, so that the lubrication performance between the bearing and the rotating shaft 121 is improved.

It should be noted that the first rotating member 111 is an internal gear, the second rotating member 112 is an external gear, and the pump portion is a gear pump. Specifically, in the gear pump meshing process, a front pair of teeth are not meshed yet, a rear pair of teeth are meshed, each inner tooth surface is in contact with an outer tooth surface to form a closed cavity, the volume of the closed cavity can be changed along with the rotation of an inner gear, and if an unloading channel cannot be communicated, an oil trapping volume can be formed. Because the compressibility of the liquid is very small, when the trapped oil volume is reduced from large to small, the liquid in the trapped oil volume is extruded, the pressure is increased sharply, and the working pressure of the gear pump is greatly exceeded. Meanwhile, liquid trapped in the oil volume is forcibly squeezed out from all gaps capable of leaking, so that the rotating shaft 121 and the bearing assembly 150 can bear large impact load, power loss is increased, oil generates heat, noise and vibration are caused, and the working stability and the service life of the gear pump are reduced. When the trapped oil volume is changed from small to large, vacuum is formed, so that air dissolved in liquid is separated out to generate bubbles, and the harm of cavitation, noise, vibration, flow, pressure pulsation and the like is brought. The method for eliminating the oil trapping phenomenon is characterized in that unloading grooves (first oil grooves) are formed in two end covers of a gear, so that the unloading grooves are communicated with an oil pressing cavity when the closed volume is reduced, and the unloading grooves are communicated with an oil suction cavity through the unloading grooves when the closed volume is increased.

Specifically, the inner gear is meshed with the tooth profile of the conjugate curve of the outer gear, and each tooth is contacted with each other to drive the outer gear to rotate in the same direction. The inner gear divides the inner cavity of the outer gear into a plurality of working cavities, the volumes of the working cavities change along with the rotation of the rotor due to the offset of the centers of the inner gear and the outer gear, a certain vacuum is formed in an area with increased volume, the oil inlet is arranged at the position, the pressure of the area with decreased volume is increased, and the oil outlet is correspondingly arranged at the position.

Regarding the design principle of the oil inlet 180 and the oil outlet 190, in the process of ensuring the rotation of the gear, the oil inlet 180 is communicated with the teeth of the first rotating member 111 and the second rotating member 112 as early as possible, before the internal gear and the external gear form the maximum volume, the gear volume cavity is always communicated with the oil inlet 180, and the oil filling time is prolonged as far as possible, so that the volume cavity between the internal gear and the external gear is filled with oil, thereby ensuring the oil absorption. The oil outlet 190 is also communicated with the high-pressure oil between the teeth as early as possible to reduce the compression work between the teeth, and is closed as late as possible to fully utilize the inertia of the fluid to exhaust the oil between the teeth, thereby improving the volumetric efficiency of the internal gear type oil pump. It should be noted, however, that the internal and external gears, when they form the maximum volume, cannot communicate with the oil inlet 180, thereby avoiding affecting the volumetric efficiency of the pump apparatus 100 at low speed.

It is worth noting that the pressure to which the first pressure chamber 114 is subjected is greater than the pressure to which the second pressure chamber 115 is subjected.

Further, the first lubrication groove 161 communicates with the first pressure chamber 114 through a high-pressure throttle groove. The high-pressure throttling groove is arranged on the end face of the first bearing 151 close to the pump part 110, and on one hand, the high-pressure throttling groove can ensure that the high-pressure lubricating oil in the first pressure cavity 114 flows into the first lubricating groove 161, so that the flow rate of the lubricating oil in the first lubricating groove 161 meets the fluid lubricating requirement; on the other hand, the high-pressure throttle groove can prevent the high-pressure lubricating oil in the first pressure chamber 114 from leaking into the first lubricating groove 161 too much to affect the displacement of the pump section 110.

Further, the second lubrication groove 162 may be a blind hole structure, and the oil in the second lubrication groove 162 flows from the first pressure chamber 114 to the second lubrication groove 162 through the oil film gap between the second bearing 152 and the pump portion 110; the second lubrication groove 162 may be a through-hole structure, and the oil in the oil sump 133 may directly flow into the second lubrication groove 162.

Example four

On the basis of the foregoing embodiment, the specific structure of the housing 130 is explained in the present embodiment, and further, as shown in fig. 1, the housing 130 includes: and a housing 131, wherein the housing 131 is enclosed outside the motor part 120 and the pump part 110, and the housing 131 is connected with the first bearing 151. The pump cover 132 is connected to the casing 131, the pump cover 132 and the casing 131 form a cavity 140, and the second bearing 152 and the pump cover 132 are of an integrated structure.

In this embodiment, the housing 130 includes a casing 131 and a pump cover 132. The housing 131 is enclosed outside the motor part 120 and the pump part 110, the housing 131 is connected to the first bearing 151, the housing 131 and the first bearing 151 may be detachably connected or fixedly connected, and further, the housing 131 and the first bearing 151 may be an integrated mechanism with high connection strength.

In addition, the pump cover 132 is connected on the casing 131, the pump cover 132 and the casing 131 form a cavity 140, the second bearing 152 and the pump cover 132 are of an integrated structure, namely the second bearing 152 and the pump cover 132 are integrally formed, more height spaces are saved, the height of the whole machine can be reduced, and the cost can be reduced.

Further, the housing 131 and the first bearing 151 are of an integrated structure.

In this embodiment, the housing 131 and the first bearing 151 are integrally formed, and compared with a post-processing method, the connection strength is higher, the space can be saved, the height of the whole machine can be reduced, the difficulty of the manufacturing process can be reduced, and the manufacturing cost can be reduced.

EXAMPLE five

On the basis of the previous embodiment, the pump device in this embodiment further includes a sealing member 170, specifically, a first bearing 151 connected to the casing 131 and dividing the cavity 140 into a motor cavity and a pump cavity; the pump apparatus 100 further comprises: and a sealing member 170 connected to the first bearing 151 and located in the motor cavity, wherein the sealing member 170 is sleeved on the rotating shaft 121.

In this embodiment, the first bearing 151 is connected to the housing 130 and divides the cavity 140 into a motor cavity and a pump cavity, so that the spatial arrangement can be more reasonable. The pump apparatus 100 further includes a sealing member 170, the sealing member 170 is connected to the first bearing 151 and located in the motor cavity, and the sealing member 170 is sleeved on the rotating shaft 121. Further, the sealing element 170 is an oil seal, and the cavity 140 is separated into a motor cavity and a pump cavity by the oil seal, so that a working medium (lubricating oil) cannot flow into the motor cavity, normal use of components such as the stator 123, the rotor 122 and the control panel in the motor cavity cannot be influenced, and other structures do not need to be additionally arranged in the motor cavity to ensure that parts in the motor cavity are corroded, so that the sealing performance of the pump device 100 is better, the structure is simpler, and the cost reduction is facilitated.

Further, a portion of the first bearing 151 extends away from the pump portion 110 to form a mounting location 171, and the seal 170 is disposed within the mounting location 171.

In this embodiment, a portion of the first bearing 151 extends away from the pump portion 110 to form the mounting portion 171, so that the mounting portion 171 is integrally formed with the first bearing 151, and the connection strength is greater than that of a post-processing method. The installation position 171 for installing the sealing member 170 is formed by a part of the first bearing 151, so that the installation accuracy of the sealing member 170 can be ensured, the assembly is simple, the sealing performance is good, and the cost is low.

Further, a buffer cavity is disposed on an axial end surface of the first bearing 151 facing away from the pump portion 110, and when the rotating shaft 121 drives the pump portion 110 to rotate, the rotating shaft contacts the first bearing 151, so that a local pressure of the first bearing 151 is compressed. Specifically, the contact pressure at the axial end surface of the rotating shaft 121 and the first bearing 151 is relatively large, an oil film exists between the first bearing 151 and the rotating shaft 121, when the rotating shaft 121 contacts the first bearing 151, the thickness of the oil film between the rotating shaft 121 and the first bearing 151 is reduced, when the oil film is smaller than the minimum thickness of the fluid lubricating oil film, the rotating shaft 121 may wear the first bearing 151, in order to avoid the situation that the first bearing 151 is worn and damaged for a long time, in this embodiment, a buffer cavity is provided on the axial end surface of the first bearing 151, and the buffer cavity can enable the first bearing 151 to deform to a certain extent, so that the rotating shaft 121 and the first bearing 151 are in flexible contact, the wear speed of the first bearing 151 is reduced, thereby effectively reducing the damage rate of the first bearing 151, and thoroughly solving the problem that the first bearing 151 is easily damaged due to the rigid connection between the rotating shaft 121 and the first bearing 151. Further, the buffer cavity is configured as an annular structure, that is, the buffer cavity is disposed on the circumference of the first bearing 151, when the rotating shaft 121 rotates, the radial force applied to the first bearing 151 may change at any time, that is, the first bearing 151 may be applied with a plurality of radial forces that change in different directions, and no matter which direction the radial force applied to the first bearing 151 faces, the first bearing 151 may deform to some extent due to the existence of the annular buffer cavity, so that the rotating shaft 121 and the first bearing 151 are flexibly connected, the first bearing 151 plays a role in buffering the radial force of the rotating shaft 121, and the problem that the first bearing 151 is easily damaged due to the rigid connection between the rotating shaft 121 and the first bearing 151 is avoided.

Further, the opening area of the buffer cavity is larger than the bottom wall area of the buffer cavity, so that the first bearing is convenient to demould in the preparation process.

Further, the buffer chamber still includes first wall, and first wall is the wall that first cell body is close to the pivot, from the open end of buffer chamber to the diapire of buffer chamber, the interval increase between first wall and the pivot.

Further, the buffer cavity comprises a second wall surface, the second wall surface and the first wall surface are arranged oppositely, and the distance between the first wall surface and the rotating shaft is reduced from the opening end of the buffer cavity to the bottom wall of the buffer cavity.

EXAMPLE six

On the basis of the foregoing embodiment, in the present embodiment, the lubricating oil path at the second bearing 152 is described, and further, the shaft hole of the second bearing 152 is a through hole that penetrates in the axial direction; a portion of the pump cover 132 extends away from the pump section 110 to configure an extension portion 132a, the extension portion 132a is used to form an oil sump 133, and the through hole is used to communicate with the oil sump 133.

In this embodiment, the shaft hole of the second bearing 152 is a through hole that is axially opened therethrough, the extension portion 132a is formed by a structure in which a portion of the pump cover 132 extends away from the pump portion 110, and the extension portion 132a forms an oil sump 133, the oil sump 133 stores lubricating oil, the through hole is used to communicate with the oil sump 133, so that the oil in the oil sump 133 can enter the gap between the second bearing 152 and the rotating shaft 121 and the second lubrication groove 162, the oil forms an oil film and plays a role of lubrication, and then the oil is pumped into the thrust oil groove to lubricate the contact surface between the first rotor 122 (internal gear) and the pump cover 132, by re-venting the clearance to the lower pressure region, the oil can flow along the second lubrication groove 162 of the second bearing 152 toward the pump portion 110 for two reasons, one is that the second lubrication groove 162 is immersed in the oil sump 133, and the other is that the thrust oil groove has the function of pumping the oil.

Further, a thrust oil groove is provided in a planar area where the pump portion 110 contacts the second bearing 152, and a starting end of the thrust oil groove communicates with a gap between the rotating shaft 121 and the second bearing 152. The grooves may be provided in pairs with the ends of the grooves not exceeding the root circle region of the first rotatable member 111 (annulus gear). The rotating shaft 121 shears the lubricating oil in the fit clearance with the second bearing 152 when rotating at a high speed, and the lubricating oil enters the thrust lubrication groove through the second lubrication groove 162 under the action of the shearing force to form a certain speed and pressure. The groove wall of the thrust oil groove is a geometric surface which gradually opens upwards from the bottom, and an included angle formed by the gradually opening surface and the end face, close to the pump part 110, of the second bearing 152 is larger than 0 degree and smaller than 90 degrees. Namely, the self-thrust oil groove faces to the gap between the thrust oil groove and the end face of the internal gear, a convergent wedge included angle can be formed, and the end face of the internal gear and the end face of the second bearing 152 move relatively, so that a fluid lubrication condition is formed between the end face of the internal gear and the contact face of the end face of the second bearing 152, and the power consumption and the abrasion of the thrust face can be greatly improved.

Further, the pump apparatus 100 further includes: the oil inlet 180 is axially arranged on the pump cover 132 and/or the second bearing 152, one end of the oil inlet 180 is communicated with the oil pool 133, and the other end of the oil inlet 180 is communicated with the second pressure cavity 115 of the pump part 110; and an oil outlet 190 radially opened on the pump cover 132 and the second bearing 152, the oil outlet 190 communicating with the first pressure chamber 114 of the pump portion 110.

In this embodiment, the pump arrangement 100 further comprises an oil inlet 180 and an oil outlet 190. The oil inlet 180 is axially arranged on the pump cover 132 and/or the second bearing 152, and two ends of the oil inlet 180 are respectively communicated with the oil pool 133 and the second pressure cavity 115 of the pump part 110, so that the oil flows out of the oil pool 133 and flows into the second pressure cavity 115 through the oil inlet 180.

Further, the oil outlet 190 is radially opened on the pump cover 132 and the second bearing 152, and the oil outlet 190 is in high pressure communication with the pump portion 110, the oil in the pump portion 110 enters the second pressure chamber 115 through the oil inlet 180, and then flows into the first pressure chamber 114, and then flows out through the oil outlet 190, and meanwhile, a part of the oil in the first pressure chamber 114 can enter the first lubrication groove 161 and/or the second lubrication groove 162, so as to perform fluid lubrication on the first bearing 151, the second bearing 152 and the rotating shaft 121.

Further, the rotating shaft 121 includes a first shaft section 121a and a second shaft section 121b connected to each other, the first bearing 151 is sleeved on the first shaft section 121a, the second bearing 152 is sleeved on the second shaft section 121b, and a shaft diameter of the first shaft section 121a is greater than or equal to a shaft diameter of the second shaft section 121 b.

In this embodiment, the first shaft section 121a is connected to the second shaft section 121b, the first bearing 151 is disposed on the first shaft section 121a, the second bearing 152 is disposed on the second shaft section 121b, and the shaft diameter of the first shaft section 121a is greater than or equal to that of the second shaft section 121 b. It can be understood that the rotating shaft 121 may have an equal axial diameter, or may be disposed in a large-and-small axial manner, wherein the motor portion 120 and the first bearing 151 are sleeved on the first axial section 121a having a larger axial diameter, and the pump portion 110 and the second bearing 152 are sleeved on the second axial section 121b having a smaller axial diameter, so that the rotating shaft 121 can meet the requirements of different loads, and the structure is more flexible.

EXAMPLE seven

In addition to the foregoing embodiments, the present embodiment describes a specific structure of the motor unit 120, and the motor unit 120 further includes: a rotor 122, the rotor 122 is connected with the rotating shaft 121; and the stator 123 is sleeved outside the rotor 122, the stator 123 comprises a stator 123 iron core and a stator 123 winding, and the stator 123 winding is arranged on the stator 123 iron core. The pump apparatus 100 further comprises: and the control part is arranged on one side of the motor part 120, which is far away from the pump part 110, is connected to the shell 130 and is positioned in the cavity 140, and the end part of the winding of the stator 123 is electrically connected with the control part.

In this embodiment, the motor part 120 further includes a rotor 122 and a stator 123. Wherein, rotor 122 and pivot 121 link to each other, can ground, and rotor 122 and pivot 121 can coaxial setting, and the cooperation mode of rotor 122 and pivot 121 can be interference fit, and can also ground, rotor 122 and pivot 121 coaxial setting but both transmission are connected, carry out nimble setting according to actual conditions. The stator 123 is sleeved outside the rotor 122, and the stator 123 includes a stator core and a stator winding, and the stator winding is disposed on the stator core. The principle of the motor unit 120 is that the electrified coil is forced to rotate in a magnetic field, and converts electric energy into mechanical energy.

In addition, the pump device 100 further includes a control portion, the control portion is disposed on a side of the motor portion 120 away from the pump portion 110, that is, the control portion is disposed at a position of the motor portion 120 away from the pump portion 110, and since the position close to the pump portion 110 vibrates significantly during operation and is subjected to a large load, the control portion is away from the pump portion 110, the control portion can be protected to a certain extent, and the service life of the control portion is prolonged.

Further, a control portion is connected to the housing 130 and located in the cavity 140, and ends of stator windings, typically copper wires, are electrically connected to the control portion.

Specifically, during the operation of the pump device 100, the control unit controls the current of the stator winding in the stator 123 to change according to a certain rule, so as to control the stator 123 to generate a changing excitation magnetic field, and the rotor 122 rotates under the action of the excitation magnetic field, so as to drive the first rotating member 111 in the pump portion 110 to rotate through the rotating shaft 121, and further to move the second rotating member 112. When the first rotating member 111 and the second rotating member 112 in the pump portion 110 rotate, due to the eccentric motion of the second rotating member 112, the volume of a compression chamber formed between the first rotating member 111 and the second rotating member 112 changes, so that the working medium entering the compression chamber is pressed out to the oil outlet 190 to generate flowing power.

Example eight

An embodiment of the second aspect of the present invention provides a vehicle 200, as shown in fig. 6, including: the pump apparatus 100 of any of the above embodiments.

Specifically, as shown in fig. 1 and 2, the pump apparatus 100 includes: pump section 110, motor section 120, housing 130, and bearing assembly 150. The motor part 120 includes a rotating shaft 121 rotating around a central axis of the motor part 120, and the rotating shaft 121 contacts the pump part 110 and can drive the pump part 110 to rotate. The housing 130 has a cavity 140, and the cavity 140 is used for accommodating the pump section 110 and the motor section 120. The bearing assembly 150 is connected to the housing 130 and is disposed on the shaft 121. The bearing assembly 150 includes a first bearing 151 and a second bearing 152, and the first bearing 151 has a first bearing surface 151a adjacent to the rotation shaft 121. The second bearing 152 is disposed on a side of the first bearing 151 facing away from the motor unit 120, the pump unit 110 is disposed between the second bearing 152 and the first bearing 151, the second bearing 152 has a second bearing surface 152a close to the rotating shaft 121, and an axial height Bs of the second bearing surface 152a is equal to or less than an axial height Bf of the first bearing surface 151 a.

According to an embodiment of the pump device 100 provided by the present invention, the pump device 100 comprises a pump portion 110, a motor portion 120, a housing 130 and a bearing assembly 150. The casing 130 has a cavity 140, and the cavity 140 is used for accommodating the pump portion 110 and the motor portion 120, that is, the pump portion 110 and the motor portion 120 are disposed in the cavity 140. The motor part 120 includes a rotating shaft 121 rotating around the central axis of the motor part 120, where the rotating shaft 121 may be an output shaft of the motor part 120 directly, or alternatively, the rotating shaft 121 is a non-driving shaft of the motor part 120, but is in transmission connection with the driving shaft. The rotating shaft 121 is in contact with the pump portion 110, and the rotating shaft 121 can drive the pump portion 110 to rotate, and it should be noted that the rotating shaft 121 and the pump portion 110 are in interference fit, so that synchronous motion of the rotating shaft 121 and the pump portion 110 is achieved. It can be understood that the motor part 120 provides power to the pump part 110 through the rotating shaft 121.

Compared with a double-rolling bearing mode, the sliding bearing is stable and reliable in operation and free of noise, the sliding surface is separated by lubricating oil and is not in direct contact under the liquid lubrication condition, friction loss and surface abrasion can be greatly reduced, the lubricating oil is filled in the gap between the sliding bearing and the rotating shaft 121, the lubricating oil on the sliding surface can form a layer of oil film, fluid lubrication is achieved, the oil film also has certain vibration absorption capacity, and the service lives of the first bearing 151, the second bearing 152 and the rotating shaft 121 are prolonged. The two sliding bearings support the rotating shaft 121, the play of the rotating shaft 121 is small, and the position degree of the axis of the rotating shaft 121 can be controlled within a reasonable range; compared with the mode that the double-rolling bearing is matched with the sliding bearing, only two sliding bearings are used, so that the supporting structure can be simplified, and the cost can be reduced.

An embodiment of the second aspect of the present invention provides a vehicle 200, including: the pump apparatus 100 according to any of the above embodiments. The utility model provides a vehicle 200 owing to have the pump unit 100 of any embodiment of the aforesaid, and then has the beneficial effect of the pump unit 100 that any embodiment of the aforesaid provided, and it is unnecessary to describe here again.

It is worth mentioning that the vehicle 200 may be a new energy automobile. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like. Of course, the vehicle 200 may also be a conventional fuel-powered vehicle.

In one particular embodiment, vehicle 200 includes a body 210 and an engine 220. The pump device 100 and the engine 220 are both arranged in the vehicle body 210, the engine 220 comprises a mounting seat 221, the mounting seat 221 is connected with the extension portion 132a of the pump device 100, an oil pool 133 is formed through the matching of the mounting seat 221 and the extension portion 132a, the oil pool 133 can be communicated with an oil source of the engine 220, and oil path communication is achieved.

In a particular application, when the vehicle 200 is a new energy vehicle, the engine 220 is an electric motor; when vehicle 200 is a fuel-powered vehicle, engine 220 is a fuel-powered engine.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump apparatus, comprising:

a pump section;

the motor part comprises a rotating shaft rotating around the central axis of the motor part, and the rotating shaft is in contact with the pump part and can drive the pump part to rotate;

a housing having a cavity for housing the pump portion and the motor portion;

a bearing assembly connected with the shell and sleeved on the rotating shaft,

the bearing assembly includes:

a first bearing having a first bearing surface proximate the shaft;

the pump portion is arranged between the second bearing and the first bearing, the second bearing is provided with a second bearing surface close to the rotating shaft, and the axial height of the second bearing surface is smaller than or equal to that of the first bearing surface.

2. Pump apparatus according to claim 1,

the sum of the axial heights of the first and second bearing surfaces is equal to or greater than the axial height of the pump portion.

3. Pump apparatus according to claim 1,

the ratio of the axial height of the first bearing surface to the shaft diameter of the first bearing is more than or equal to 1.25 and less than or equal to 1.38; and/or

The ratio of the axial height of the second bearing surface to the shaft diameter of the second bearing is more than or equal to 1.13 and less than or equal to 1.38.

4. Pump apparatus according to claim 3,

the shaft diameter of the first bearing is more than or equal to 6mm and less than or equal to 12 mm;

the shaft diameter of the second bearing is more than or equal to 6mm and less than or equal to 12 mm.

5. Pump apparatus according to claim 1,

a part of the inner side wall of the first bearing is away from the rotating shaft to form a first lubricating groove in a concave mode; and/or

A part of the inner side wall of the second bearing deviates from the rotating shaft and is recessed to form a second lubricating groove.

6. Pump apparatus according to claim 5,

the pump section includes:

the first rotating piece is matched with the rotating shaft;

the second rotating part is arranged on the outer side of the first rotating part, the first rotating part can drive the second rotating part to rotate, the second rotating part and the first rotating part form a compression cavity, the compression cavity comprises a first pressure cavity and a second pressure cavity, and the pressure borne by the first pressure cavity is greater than the pressure borne by the second pressure cavity;

wherein the first lubrication groove and/or the second lubrication groove are in communication with the first pressure chamber.

7. Pump arrangement according to any one of claims 1 to 6,

the housing includes:

the shell is arranged around the outer sides of the motor part and the pump part and connected with the first bearing;

the pump cover is connected to the casing, the pump cover and the casing form the cavity, and the second bearing and the pump cover are of an integrated structure.

8. The pump arrangement according to claim 7,

the shell and the first bearing are of an integrated structure.

9. The pump arrangement according to claim 7,

the first bearing is connected to the shell and divides the cavity into a motor cavity and a pump cavity;

the pump device further includes:

and the sealing element is connected to the first bearing and positioned in the motor cavity, and the rotating shaft is sleeved with the sealing element.

10. The pump arrangement according to claim 9,

a portion of the first bearing extends away from the pump portion to create a mounting location in which the seal is disposed.

11. The pump arrangement according to claim 7,

the shaft hole of the second bearing is a through hole which penetrates through the shaft hole in the axial direction;

a part of the pump cover extends away from the pump part to construct an extension part, the extension part is used for forming an oil pool, and the through hole is used for communicating the oil pool.

12. The pump apparatus of claim 11, further comprising:

the oil inlet is axially arranged on the pump cover and/or the second bearing, one end of the oil inlet is communicated with the oil pool, and the other end of the oil inlet is communicated with a second pressure cavity of the pump part;

and the oil outlet is radially arranged on the pump cover and the second bearing and is communicated with the first pressure cavity of the pump part.

13. Pump arrangement according to any one of claims 1 to 6,

the rotating shaft comprises a first shaft section and a second shaft section which are connected, the first shaft section is sleeved with the first bearing, the second shaft section is sleeved with the second bearing, and the shaft diameter of the first shaft section is larger than or equal to that of the second shaft section.

14. Pump arrangement according to any one of claims 1 to 6,

the motor section further includes:

the rotor is connected with the rotating shaft;

the stator is sleeved on the outer side of the rotor and comprises a stator core and a stator winding, and the stator winding is arranged on the stator core;

the pump device further includes:

the control part is arranged on one side, deviating from the pump part, of the motor part, the control part is connected to the shell and located in the cavity, and the end part of the stator winding is electrically connected with the control part.

15. A vehicle, characterized by comprising: a pump device according to any one of claims 1 to 14.