CN216278449U

CN216278449U - Bidirectional cycloid pump

Info

Publication number: CN216278449U
Application number: CN202122748443.7U
Authority: CN
Inventors: 凌利江; 裴豪
Original assignee: Hangzhou Xiaoshan Oriental Hydraulic Co ltd
Current assignee: Hangzhou Xiaoshan Oriental Hydraulic Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-04-12
Anticipated expiration: 2031-11-09

Abstract

The utility model discloses a bidirectional cycloid pump, and aims to provide a bidirectional cycloid pump which can ensure the lubricating performance of bearing parts between a shaft and a shell and between the shaft and a pump cover in the working process of the bidirectional cycloid pump. The oil seal, the first bearing and the second bearing are sequentially distributed along the axial direction of the shaft, a gap is formed between the oil seal and the first bearing, the gap forms an annular cavity, a first connecting channel for communicating the annular cavity with the oil suction cavity is arranged on the shell, and an in-shaft oil way and a second connecting channel for communicating the in-shaft oil way with the annular cavity are arranged in the shaft.

Description

Bidirectional cycloid pump

Technical Field

The utility model relates to a hydraulic oil pump, in particular to a bidirectional cycloid pump.

Background

With the continuous development of industrial technology and the application of a large number of new technologies, the requirements of a gear box used on a mechanical hydraulic system on a matched oil pump are greatly improved compared with the prior art, and the gear box has the advantages of reversible power source direction, high rotating speed, stable transmission, good reliability and the like. The bidirectional cycloid pump is widely applied because the direction of an oil inlet and an oil outlet is unchanged when the bidirectional cycloid pump can adapt to the change of a power source. The existing bidirectional cycloid pump generally comprises a shell, a pump cover, a shaft, a cavity formed between the shell and the pump cover, a rotary pump body arranged in the cavity and a rotor pair arranged in the rotary pump body, wherein the cavity comprises an oil suction cavity and an oil pressing cavity, the shaft, the shell, the shaft and the pump cover are rotatably connected through bearings, the rotor pair comprises an inner rotor sleeved on the shaft and an outer rotor meshed with the inner rotor, the shaft is used for driving the inner rotor to rotate clockwise or anticlockwise, in the process, an oil inlet and an oil outlet are always kept unchanged, and oil enters the oil pressing cavity from the oil suction cavity and is discharged out of the pump through the oil outlet.

The shaft of the existing bidirectional cycloid pump is used as an important part for power transmission, and the lubricating performance of the bearing part between the shaft and a shell and between the shaft and a pump cover is a critical ring which influences the transmission stability, the mechanical efficiency, the service life of components and the like of the bidirectional cycloid pump; however, lubricating oil at the bearing part between the shaft and the shell and between the shaft and the pump cover of the existing bidirectional cycloid pump is inconvenient to add, and the problems of influence on transmission stability, mechanical efficiency and component service life due to poor lubricating effect exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bidirectional cycloid pump which can ensure the lubricating performance of bearing parts between a shaft and a shell and between the shaft and a pump cover in the working process of the bidirectional cycloid pump, thereby effectively solving the problems of influence on transmission stability, mechanical efficiency and component service life caused by poor lubricating effect of the bearing parts between the shaft and the shell and between the shaft and the pump cover.

The technical scheme of the utility model is as follows:

the utility model provides a two-way cycloid pump, includes casing, pump cover, axle and forms the cavity between casing and pump cover, and this cavity includes inhales oil cavity and presses the oil cavity, rotate through first bearing between axle and the casing and be connected, be equipped with the oil blanket between axle and the casing, rotate through the second bearing between axle and the pump cover and be connected, oil blanket, first bearing and second bearing distribute in proper order along the axial of axle, have the clearance between oil blanket and the first bearing, this clearance forms annular cavity, be equipped with the first interface channel of intercommunication annular cavity and inhaling oil cavity on the casing, the epaxial second interface channel that is equipped with epaxial oil circuit and intercommunication epaxial oil circuit and annular cavity that is equipped with, the one end of epaxial oil circuit extends toward the pump cover direction and forms into the hydraulic fluid port on the terminal surface of the axle towards the pump cover.

In the working process of the bidirectional cycloid pump, as the oil path in the shaft is communicated with the oil suction cavity through the second connecting channel and the annular cavity and the first connecting channel to form negative pressure, oil at the pump cover enters the oil path in the shaft through the oil inlet, sequentially passes through the oil path in the shaft, the second connecting channel, the annular cavity and the first connecting channel, and then enters the oil suction cavity to form a lubricating circulating oil path in the pump; in the process, oil liquid passes through the first bearing and the second bearing to ensure the lubricating performance of the bearing parts between the shaft and the shell and between the shaft and the pump cover in the working process of the bidirectional cycloid pump, so that the problems of influence on transmission stability, mechanical efficiency and component service life due to poor lubricating effect of the bearing parts between the shaft and the shell and between the shaft and the pump cover are effectively solved. On the other hand, the oil suction cavity has an ingenious integral structure, the negative pressure of the oil suction cavity is used as a power source, additional power is not needed, and oil supply is stable.

Preferably, a throttling nozzle is arranged in the oil path in the shaft, a throttling through hole is formed in the throttling nozzle, and the throttling nozzle is close to the oil inlet. So, can reduce the velocity of flow and the flow that fluid got into the interior oil circuit of axle through the oil inlet, under the circumstances of the lubricating property at the bearing position between assurance axle and casing and axle and pump cover, avoid too much entering lubrication of fluid, and influence the work efficiency of two-way cycloid pump.

Preferably, the throttle nozzle is connected with the oil passage in the shaft through threads. This facilitates time-consuming mounting and dismounting of the throttle valve.

Preferably, a gap is provided between the end surface of the shaft facing the pump cover and the pump cover. Therefore, the two-way cycloid pump is beneficial to oil on the pump cover to enter an oil way in the shaft through the oil inlet in the working process.

Preferably, the oil passage in the shaft extends in the axial direction of the shaft, and the second connecting passage extends in the radial direction of the shaft. Therefore, machining and manufacturing of the oil circuit in the shaft and the second connecting circuit are facilitated.

Preferably, the first bearing and the second bearing are both sliding bearings.

Preferably, the pump further comprises a rotary pump body arranged in the cavity, a rotor pair arranged in the rotary pump body and a compression spring positioned between the rotary pump body and the pump cover, wherein the rotor pair comprises an inner rotor sleeved on the shaft and an outer rotor meshed with the inner rotor, the inner rotor is in key connection with the shaft, and the rotary pump body is abutted against the end faces of the inner rotor and the outer rotor under the action of the compression spring.

Preferably, the shaft is sleeved with a plane bearing, the plane bearing and the rotary pump body are positioned on two opposite sides of the compression spring, one end of the compression spring abuts against the rotary pump body, and the other end of the compression spring abuts against the plane bearing and enables the plane bearing to abut against the pump cover. Therefore, in the process that the power source changes and the rotating direction of the shaft changes, the friction resistance applied to the rotating pump body in the rotating process can be reduced, and the rotating pump body can operate together with the plane bearing without clamping stagnation in operation.

Preferably, the inner rotor is connected with the shaft by a thermal sleeve.

Preferably, the inner rotor and the outer rotor adopt a tooth difference type cycloid structure. Therefore, the structure of the oil pump is ensured to be compact, and the stable and reliable output of the oil pump can be ensured.

The utility model has the beneficial effects that: the lubricating performance of the bearing parts between the shaft and the shell and between the shaft and the pump cover in the working process of the bidirectional cycloid pump can be ensured, so that the problems of influence on transmission stability, mechanical efficiency and component service life due to poor lubricating effect of the bearing parts between the shaft and the shell and between the shaft and the pump cover are effectively solved.

Drawings

Fig. 1 is a schematic view of a cross-sectional structure of a bi-directional gerotor pump of the present invention.

Fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1.

Figure 3 is a schematic three-dimensional view of a bi-directional gerotor pump of the present invention.

In the figure:

a housing 1;

a pump cover 2;

rotating the pump body 3;

an inner rotor 4.1 and an outer rotor 4.2;

a shaft 5;

an oil seal 6;

a first bearing 7;

an annular cavity 8;

a second bearing 9;

an in-shaft oil passage 10;

a first connecting passage 11;

a second connecting channel 12;

an oil suction chamber 13;

a pressure oil chamber 14;

an oil inlet 15;

an oil outlet 16;

a key 17;

an oil inlet 18;

a throttle mouth 19;

a throttle through hole 20;

a compression spring 21;

a flat bearing 22.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present scheme, and are not construed as limiting the scheme of the present invention.

These and other aspects of embodiments of the utility model will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the utility model have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the utility model may be practiced, but it is understood that the scope of the embodiments of the utility model is not limited thereby. On the contrary, the embodiments of the utility model include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1, 2, and 3, a bidirectional gerotor pump includes a housing 1, a pump cover 2, a shaft 5, a cavity formed between the housing and the pump cover, a rotary pump body 3 disposed in the cavity, and a rotor pair disposed in the rotary pump body. The rotor pair comprises an inner rotor 4.1 sleeved on the shaft and an outer rotor 4.2 meshed with the inner rotor. The inner rotor is connected to the shaft by a key 17. The cavity comprises an oil suction chamber 13 and a pressure oil chamber 14. The shell is provided with an oil inlet 15 and an oil outlet 16, the oil inlet is communicated with the oil suction cavity, and the oil outlet is communicated with the oil pressing cavity.

The shaft is rotatably connected with the shell through a first bearing 7, an oil seal 6 is arranged between the shaft and the shell, and the shaft is rotatably connected with the pump cover through a second bearing 9. In this embodiment, the first bearing and the second bearing are both sliding bearings, and of course, the first bearing and the second bearing may also be rolling bearings. The outer end of the shaft is located on the outer side of the shell, and the inner end of the shaft faces the pump cover. The oil seal, the first bearing and the second bearing are sequentially distributed along the axial direction of the shaft, and particularly, the outer end oil seal, the first bearing and the second bearing of the shaft are sequentially distributed along the axial direction of the shaft. The second bearing is located the inner of axle or is close to the inner of axle, and in this embodiment, be equipped with the shaft hole on the pump cover, the inner of axle stretches into the axle in, the second bearing is located the shaft hole. There is a gap between the oil seal and the first bearing, which gap forms an annular cavity 8. The shell is provided with a first connecting channel 11 for communicating the annular cavity with the oil suction cavity. An in-shaft oil way 10 and a second connecting channel 12 communicated with the in-shaft oil way and the annular cavity are arranged in the shaft. One end of the in-shaft oil passage extends toward the pump cover and forms an oil inlet 18 on the end surface of the shaft facing the pump cover, i.e., one end of the in-shaft oil passage extends toward the pump cover and forms an oil inlet on the inner end surface of the shaft.

Further, as shown in fig. 1, a throttle nozzle 19 is arranged in the oil path in the shaft, a throttle through hole 20 is arranged in the throttle nozzle, and the throttle nozzle is close to the oil inlet. So, can reduce the velocity of flow and the flow that fluid got into the interior oil circuit of axle through the oil inlet, under the circumstances of the lubricating property at the bearing position between assurance axle and casing and axle and pump cover, avoid too much entering lubrication of fluid, and influence the work efficiency of two-way cycloid pump.

The throttle nozzle is connected with the oil path in the shaft through threads. This facilitates time-consuming mounting and dismounting of the throttle valve.

The oil passage in the shaft extends in the axial direction of the shaft, and the second connecting passage extends in the radial direction of the shaft. Therefore, machining and manufacturing of the oil circuit in the shaft and the second connecting circuit are facilitated.

Further, as shown in fig. 1, a gap is provided between the end surface of the shaft facing the pump cover and the pump cover. Therefore, the two-way cycloid pump is beneficial to oil on the pump cover to enter an oil way in the shaft through the oil inlet in the working process.

Further, as shown in fig. 1, the bidirectional gerotor pump further includes a compression spring 21 disposed between the rotary pump body and the pump cover, and the compression spring is sleeved on the shaft. The rotary pump body is abutted against the end faces of the inner rotor and the outer rotor under the action of the compression spring. The shaft is sleeved with a plane bearing 22, and the plane bearing and the rotary pump body are positioned on two opposite sides of the compression spring. In this embodiment, the pump cover is provided with an annular step. One end of the compression spring is propped against the rotary pump body. The other end of the compression spring is abutted against the plane bearing and the plane bearing is abutted against the pump cover; specifically, the other end of the compression spring abuts against the plane bearing and enables the plane bearing to abut against an annular step on the pump cover. Therefore, in the process of power source change and shaft rotation direction change, the friction resistance applied to the rotating pump body in the operation process can be reduced, so that the rotating pump body can operate together with the plane bearing without clamping stagnation in the operation process.

Further, the inner rotor is connected with the shaft through a thermal sleeve.

Furthermore, the inner rotor and the outer rotor adopt a tooth difference type cycloid structure. Therefore, the structure of the oil pump is ensured to be compact, and the stable and reliable output of the oil pump can be ensured.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a two-way cycloid pump, includes casing, pump cover, axle and forms the cavity between casing and pump cover, and this cavity includes inhales oil cavity and presses oil cavity, characterized by, rotate through first bearing between axle and the casing and be connected, be equipped with the oil blanket between axle and the casing, rotate through the second bearing between axle and the pump cover and be connected, oil blanket, first bearing and second bearing distribute in proper order along the axial of axle, have the clearance between oil blanket and the first bearing, this clearance forms annular cavity, be equipped with the first connecting channel who feeds through annular cavity and inhale oil cavity on the casing, be equipped with epaxial interior oil circuit and the second connecting channel who feeds through interior oil circuit of axle and annular cavity in the axle, the one end of the interior oil circuit of axle extends towards the pump cover direction and forms into the hydraulic fluid port on the terminal surface of the axle towards the pump cover.

2. The bi-directional gerotor pump of claim 1, wherein a throttle nipple is disposed in the in-shaft oil passage, a throttle through-hole is disposed in the throttle nipple, and the throttle nipple is adjacent to the oil inlet.

3. The bi-directional gerotor pump of claim 2 wherein the restriction nozzle is threadably connected to the in-shaft oil passage.

4. The bi-directional gerotor pump of claim 1, 2, or 3 wherein the end face of the shaft facing the pump cover has a clearance from the pump cover.

5. The bi-directional gerotor pump of claims 1, 2, or 3 wherein the in-shaft oil passage extends in an axial direction of the shaft and the second connecting passage extends in a radial direction of the shaft.

6. The bi-directional gerotor pump of claim 1, 2, or 3 wherein the in-shaft oil passage extends in an axial direction of the shaft, and wherein the first and second bearings are both plain bearings.

7. The bidirectional gerotor pump of claim 1, 2 or 3, further comprising a rotary pump body arranged in the cavity, a rotor pair arranged in the rotary pump body, and a compression spring positioned between the rotary pump body and the pump cover, wherein the rotor pair comprises an inner rotor sleeved on the shaft and an outer rotor meshed with the inner rotor, the inner rotor is connected with the shaft through a key, and the rotary pump body is abutted against the end faces of the inner rotor and the outer rotor under the action of the compression spring.

8. The bi-directional gerotor pump of claim 7 wherein the shaft is sleeved with a flat bearing, the flat bearing and the rotating pump body being on opposite sides of a compression spring, one end of the compression spring bearing against the rotating pump body and the other end of the compression spring bearing against the flat bearing and the flat bearing against the pump cover.

9. The bi-directional gerotor pump of claim 7 wherein the inner rotor is shrink-fitted to the shaft.

10. The bi-directional gerotor pump of claim 7 wherein the inner and outer rotors are of a tooth-differential gerotor configuration.