CN108561740B

CN108561740B - Oil pump

Info

Publication number: CN108561740B
Application number: CN201810752841.6A
Authority: CN
Inventors: 陈贤明; 陈贤建; 赵祯年
Original assignee: Zhejiang Pingchai Pump Industry Co ltd
Current assignee: Zhejiang Pingchai Pump Industry Co ltd
Priority date: 2018-07-10
Filing date: 2018-07-10
Publication date: 2020-04-10
Anticipated expiration: 2038-07-10
Also published as: CN108561740A

Abstract

The invention discloses an oil pump, which adopts the technical scheme that the oil pump comprises a pump body, a pump cover detachably connected with the pump body, an inner rotor, an outer rotor and a supporting shaft for supporting the inner rotor, wherein the inner rotor and the outer rotor are meshed with each other, a containing cavity for containing the inner rotor and the outer rotor is arranged in the pump body, and the inner rotor and the outer rotor are eccentrically arranged, and the oil pump is characterized in that: the outer edge surface of the outer rotor is fixedly connected with the outer side wall of the containing cavity, the inner rotor is coaxially and rotatably connected with the supporting shaft, a fixed shaft used for supporting the pump body is arranged on one side, back to the pump cover, of the pump body, the fixed shaft is coaxially and rotatably connected with the pump body, an oil inlet and outlet hole is formed in the fixed shaft, one end, back to the pump cover, of the supporting shaft is fixedly connected with the fixed shaft, a transmission gear used for driving the pump body to rotate is coaxially and fixedly connected to the pump body, and the outer rotor drives. The oil pump has small acting force on the supporting shaft in a working state, and the supporting shaft is not easy to damage.

Description

Oil pump

Technical Field

The invention relates to the field of pumps, in particular to an oil pump.

Background

In order to ensure the circulating oil quantity of an engine lubricating system, the oil pump sucks the oil from an oil sump to a main oil duct, and necessary media are provided for lubricating all parts of the engine. The internal gear pump is a pump structure of an oil pump, the oil pump of the structure drives a driven outer rotor to rotate in the same direction through a driving inner rotor, gears on the inner rotor and the outer rotor at an oil inlet are separated from each other to form negative pressure to suck engine oil, and the gears at an oil outlet are continuously embedded and meshed to extrude and output the engine oil.

The active inner rotor is generally coaxially and fixedly connected with a support shaft for driving the inner rotor to rotate, and the support shaft not only needs to drive the inner rotor to rotate, but also needs to drive the outer rotor to rotate through the inner rotor, and the rotation friction force between the outer rotor and the pump body needs to be overcome in the rotation process of the outer rotor, so that the torsion force borne by the support shaft is large. In the oil pump, since the rotational speed of the gear is generally increased to improve the oil delivery efficiency, the rotational speed of the support shaft is increased to further increase the torsional force applied thereto, and thus the support shaft is likely to be deformed or damaged by an excessive torsional force in a long-term operation state.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an oil pump which has small acting force on a supporting shaft in a working state and the supporting shaft is not easy to damage.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an oil pump, includes the pump body, can dismantle the pump cover of being connected, intermeshing's inner rotor and external rotor and be used for supporting the back shaft of inner rotor with the pump body, be provided with the holding chamber that is used for holding inner rotor and external rotor in the pump body, inner rotor and external rotor eccentric settings, the outer fringe face of external rotor and the lateral wall fixed connection in holding chamber, inner rotor and the coaxial swivelling joint of back shaft, one side that the pump body is opposite to the pump cover is provided with the fixed axle that is used for supporting the pump body, fixed axle and the coaxial swivelling joint of pump body, be provided with the business turn over oilhole on the fixed axle, the one end and the fixed axle fixed connection of back shaft opposite to the pump cover, coaxial fixedly connected with is used for driving the rotatory drive gear of.

As a further improvement of the invention, the outer side surface of the inner rotor is recessed with a first sliding groove for containing engine oil, the first sliding groove is provided with a side open groove at one side close to the support shaft, a sliding member for changing the engine oil capacity in the first sliding groove is connected in a sliding manner in the first sliding groove, the sliding member comprises a sliding block and a guide post capable of sliding in the side open groove, the outer contour of the sliding block is matched with the inner contour of the first sliding groove, the support shaft is recessed with a guide groove for the sliding of the guide post at one side close to the inner rotor, the outer diameter of the guide post is matched with the groove width of the guide groove, one end of each guide post is fixedly connected with the sliding block, the other end of each guide post penetrates through the side open groove to slide in the guide groove, a plurality of the guide posts slide in the guide groove under the rotation state of the inner rotor, the guide groove is arranged in a ring shape, and the center of the circle center of the guide groove, the center axis of the On a plane, the central axis of inner rotor is located between the centre of a circle of guide way and the central axis of outer rotor, and the guide post drives the sliding block along the length direction sliding state in first sliding groove under, and the machine oil capacity in first sliding groove constantly changes.

As a further improvement of the invention, a rubber layer for enhancing the tightness between the sliding block and the first sliding groove is arranged between the sliding block and the first sliding groove, and the rubber layer surrounds the sliding block for a circle and is fixedly connected with the sliding block.

As a further improvement of the invention, a first hoop and a second hoop are arranged in the guide groove, the circle centers of the first hoop, the second hoop and the guide groove are all located on the same straight line, the inner diameter of the first hoop is larger than that of the second hoop, a plurality of first balls are arranged between the first hoop and the outer ring side wall of the guide groove, the outer diameter of the first balls is matched with the distance between the first hoop and the outer ring side wall of the guide groove, the plurality of first balls are arranged along the circumferential direction of the first hoop, a plurality of second balls are arranged between the second hoop and the inner ring side wall of the guide groove, the outer diameter of the second balls is matched with the distance between the second hoop and the inner ring side wall of the guide groove, the plurality of second balls are arranged along the circumferential direction of the second hoop, the distance between the first hoop and the second hoop is matched with the outer diameter of the guide column, the guide post drives the first hoop and the second hoop to rotate in a sliding state in the guide groove.

As a further improvement of the present invention, opposite sides of the outer side wall of the guide groove and the first hoop are each concavely provided with a first rolling groove for rolling the first ball, the first rolling grooves are each annularly arranged along a circumferential direction of the outer side wall of the guide groove and the first hoop, a cross section of a groove wall of each first rolling groove is arranged in an arc line, in a rotating state of the first hoop, the first ball rolls in the two first rolling grooves, opposite sides of the inner side wall of the guide groove and the second hoop are each concavely provided with a second rolling groove for rolling the second ball, the second rolling grooves are each annularly arranged along a circumferential direction of the inner side wall of the guide groove and the second hoop, a cross section of a groove wall of each second rolling groove is arranged in an arc line, and in a rotating state of the second hoop, the second ball rolls in the two second rolling grooves.

As a further improvement of the invention, one side of the sliding block facing the outer rotor is concavely provided with a second sliding groove, a sliding plate is connected in the second sliding groove in a sliding manner, the outer contour of the sliding plate is matched with the inner contour of the second sliding groove, two opposite sides of the notch of the second sliding groove are provided with a stop block for stopping the sliding plate from sliding out of the second sliding groove, a spring is arranged between the groove bottom of the second sliding groove and the sliding plate, the spring is in a compression state, and the sliding plate is abutted against the stop block under the elastic force of the spring.

The invention has the beneficial effects that: when the pump body rotates, the outer rotor is driven to rotate, the outer rotor drives the inner rotor to rotate around the central axis of the supporting shaft, the mutual separation position of the gears on the inner rotor and the outer rotor forms negative pressure and sucks in engine oil through one oil inlet and outlet hole, the gears on the inner rotor and the outer rotor are continuously embedded into a meshing position to extrude and output the engine oil through the other oil inlet and outlet hole, the two oil inlet and outlet holes are respectively communicated with the oil pan and the main oil duct, therefore, the engine oil pump can suck the engine oil to the main oil duct from the oil pan, and the pump body is driven to rotate through the transmission gear when the engine oil pump works, the outer rotor and the inner rotor are driven to rotate by the pump body, the rotational inertia is large, the inner rotor is easier to drive to rotate, compared with the traditional engine, the supporting shaft does not need to drive the inner rotor to rotate, so that the supporting shaft hardly receives torsional force and is not easy to deform or damage, and the acting force of the oil pump on the supporting shaft is small in the working state, and the supporting shaft is not easy to damage.

Drawings

FIG. 1 is a schematic perspective view of an oil pump;

FIG. 2 is a cross-sectional view of an oil pump;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is a sectional view of the connection of the sliding member and the first sliding groove;

FIG. 5 is a schematic view of a stationary shaft;

fig. 6 is a structural sectional view of the guide groove.

Reference numerals: 1. a pump body; 11. an accommodating cavity; 2. a pump cover; 3. an inner rotor; 31. a first sliding groove; 32. side grooving; 33. a sliding member; 331. a sliding block; 3311. a second sliding groove; 3312. a slide plate; 3313. a stopper; 3314. a spring; 332. a guide post; 333. a rubber layer; 4. an outer rotor; 5. a support shaft; 6. a fixed shaft; 61. a guide groove; 62. a first hoop; 63. a second hoop; 64. a first ball bearing; 65. a second ball bearing; 66. a first roll groove; 67. a second roll groove; 7. an oil inlet and outlet; 8. a transmission gear.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Referring to fig. 1 to 6, an oil pump of this embodiment includes a pump body 1, a pump cover 2 detachably connected to the pump body 1, an inner rotor 3 and an outer rotor 4 engaged with each other, and a support shaft 5 for supporting the inner rotor 3, a housing cavity 11 for housing the inner rotor 3 and the outer rotor 4 is provided in the pump body 1, the inner rotor 3 and the outer rotor 4 are eccentrically disposed, an outer edge surface of the outer rotor 4 is fixedly connected to a sidewall of the housing cavity 11, the inner rotor 3 is coaxially and rotatably connected to the support shaft 5, a fixed shaft 6 for supporting the pump body 1 is provided on a side of the pump body 1 facing away from the pump cover 2, the fixed shaft 6 is coaxially and rotatably connected to the pump body 1, an oil inlet/outlet hole 7 is provided on the fixed shaft 6, one end of the support shaft 5 facing away from the pump cover 2 is fixedly connected to the fixed shaft 6, a, the outer rotor 4 rotates the inner rotor 3.

The oil inlet and outlet hole 7 is provided with two, and one is used for the oil feed in the use, and another is used for producing oil, and when the direction of rotation of the pump body changed, the oil inlet and outlet hole 7 that originally was used for the oil feed became and is used for producing oil, and the oil inlet and outlet hole 7 that originally was used for producing oil became and is used for the oil feed. A driving motor can be arranged, the driving motor drives a transmission gear 8 and a pump body 1 fixedly connected with the transmission gear 8 to rotate around the central axis of a fixed shaft 6 through a gear or a synchronous transmission belt, when the pump body 1 rotates, the outer rotor 4 is driven to rotate, the outer rotor 4 drives an inner rotor 3 to rotate around the central axis of a supporting shaft 5, the gear on the inner rotor 3 and the gear on the outer rotor 4 form negative pressure at the position where the inner rotor 3 and the gear on the outer rotor 4 are separated from each other and suck engine oil through an oil inlet and outlet hole 7, the engine oil is extruded and output through another oil inlet and outlet hole 7 by continuously embedding the gears on the inner rotor 3 and the outer rotor 4 into a meshing position, the two oil inlet and outlet holes 7 are respectively communicated with an oil pan and a main oil duct, therefore, the engine oil pump can, the rotary inertia of the oil pump is large, the inner rotor 3 is driven to rotate more easily, compared with a traditional oil pump, the supporting shaft 5 of the oil pump is in rotary connection with the inner rotor 3, the supporting shaft 5 is only used for supporting the inner rotor 3 and serves as a rotary center of the inner rotor 3, the supporting shaft is kept still, the supporting shaft 5 does not need to drive the inner rotor 3 to rotate, the supporting shaft 5 hardly receives torsional force and is not prone to deformation or damage, and therefore the acting force of the oil pump on the supporting shaft 5 in the working state is small, and the supporting shaft 5 is not prone to.

As an improved specific embodiment, the depressions of the outer side surface of the inner rotor 3 are all concavely provided with a first sliding groove 31 for containing engine oil, one side of the first sliding groove 31 close to the support shaft 5 is all provided with a side open groove 32, a sliding member 33 for changing the engine oil capacity in the first sliding groove 31 is connected in a sliding manner in the first sliding groove 31, each sliding member 33 comprises a sliding block 331 and a guide post 332 capable of sliding in the side open groove 32, the outer profile of the sliding block 331 is adapted to the inner profile of the first sliding groove 31, one side of the support shaft 5 close to the inner rotor 3 is all concavely provided with a guide groove 61 for the guide post 332 to slide, the outer diameter of the guide post 332 is adapted to the groove width of the guide groove 61, one end of each guide post 332 is fixedly connected with the sliding block 331, the other end passes through the side open groove 32 to slide in the guide groove 61, and a plurality of the guide posts 332 all slide in the guide groove 61 in the rotating state of, the guide groove 61 is annularly arranged, the circle center of the guide groove 61, the central axis of the inner rotor 3 and the central axis of the outer rotor 4 are located on the same plane, the central axis of the inner rotor 3 is located between the circle center of the guide groove 61 and the central axis of the outer rotor 4, and the guide post 332 drives the sliding block 331 to slide along the length direction of the first sliding groove 31, so that the engine oil capacity in the first sliding groove 31 is continuously changed.

When the inner rotor 3 rotates, the guide post 332 is driven to slide in the guide groove 61, because the center of the guide groove 61 and the central axis of the inner rotor 3 are arranged eccentrically to each other, when the guide post 332 slides in the guide groove 61, the guide post 332 drives the sliding block 331 to slide in the first sliding groove 31, because the central axis of the inner rotor 3 is located between the center of the guide groove 61 and the central axis of the outer rotor 4, when the notch of the first sliding groove 31 faces the meshing position of the inner rotor 3 and the outer rotor 4, the sliding block 331 is located farthest from the bottom of the first sliding groove 31, at this time, the volume of the oil storage space formed between the teeth on the inner rotor 3 and the teeth on the outer rotor 4 is minimum, and through the arrangement of the first sliding groove 31, the sliding piece 33, the side opening groove 32 and the guide groove 61, when the inner rotor 3 rotates, the sliding block 331 slides in the first sliding groove 31, the volume change of the oil storage space formed between the teeth on the inner rotor 3 and the teeth on the outer rotor 4 is further increased, and when the inner rotor 3 rotates for one circle, the delivery amount of the engine oil is increased, so that the delivery efficiency of the engine oil is higher, and the engine oil pump can provide higher delivery efficiency of the engine oil under the condition that the rotating speed of the inner rotor 3 is not changed.

As a modified specific embodiment, a rubber layer 333 for enhancing the tightness between the sliding block 331 and the first sliding groove 31 is arranged between the sliding block 331 and the first sliding groove 31, and the rubber layer 333 is arranged around the sliding block 331 and is fixedly connected with the sliding block 331.

Because the rubber layer 333 has certain elasticity, the rubber layer 333 is provided to facilitate filling of a gap between the sliding block 331 and the first sliding groove 31, so that the sliding block 331 and the first sliding groove 31 are connected more tightly, and the situation that when the volume of an oil storage space formed between teeth on the inner rotor 3 and teeth on the outer rotor 4 is changed, engine oil enters between the groove bottom of the first sliding groove 31 and one side of the sliding block 331, which is far away from the outer rotor 4, through the connecting gap between the sliding block 331 and the first sliding groove 31 from the oil storage space, so that the engine oil can move away when the volume of the oil storage space is changed, and the transmission efficiency of the engine oil is reduced.

As a specific embodiment of the improvement, a first hoop 62 and a second hoop 63 are arranged in the guide groove 61, the circle centers of the first hoop 62, the second hoop 63 and the guide groove 61 are all located on the same straight line, the inner diameter of the first hoop 62 is larger than the inner diameter of the second hoop 63, a plurality of first balls 64 are arranged between the first hoop 62 and the outer ring side wall of the guide groove 61, the outer diameter of the first balls 64 is matched with the distance between the first hoop 62 and the outer ring side wall of the guide groove 61, the plurality of first balls 64 are arranged along the circumferential direction of the first hoop 62, a plurality of second balls 65 are arranged between the second hoop 63 and the inner ring side wall of the guide groove 61, the outer diameter of the second balls 65 is matched with the distance between the second hoop 63 and the inner ring side wall of the guide groove 61, the plurality of second balls 65 are arranged along the circumferential direction of the second hoop 63, the distance between the first hoop 62 and the second hoop 63 is matched with the outer diameter of the guide column 332, the guiding post 332 drives the first hoop 62 and the second hoop 63 to rotate in the sliding state in the guiding groove 61.

The guide post 332 may not abut against the bottom of the guide groove 61, when the guide post 332 slides in the guide groove 61, the first hoop 62 and the second hoop 63 are driven to rotate around the center of the circle, the first ball 64 and the second ball 65 are driven to roll by the first hoop 62 and the second hoop 63 in the rotating state, and therefore, through the arrangement of the first hoop 62, the second hoop 63, the first ball 64 and the second ball 65, the sliding friction between the guide post 332 and the guide groove 61 is converted into the rolling friction, so that the guide post 332 is easier to slide in the guide groove 61 and the sliding is smoother, the rotation resistance of the inner rotor 3 in the rotating process is reduced, which is beneficial to reducing the driving force required by the rotation of the inner rotor 3, and the driving cost is saved.

As a modified specific embodiment, the opposite sides of the outer side wall of the first hoop 62 and the outer side wall of the guide groove 61 are both provided with a first rolling groove 66 for the first ball 64 to roll, the first rolling groove 66 is annularly arranged along the circumferential direction of the outer side wall of the first hoop 62 and the outer side wall of the guide groove 61, the cross section of the groove wall of the first rolling groove 66 is arranged in an arc line, the first ball 64 rolls in the two first rolling grooves 66 in the rotating state of the first hoop 62, the opposite sides of the inner side wall of the second hoop 63 and the inner side wall of the guide groove 61 are both provided with a second rolling groove 67 for the second ball 65 to roll, the second rolling groove 67 is annularly arranged along the circumferential direction of the inner side wall of the second hoop 63 and the guide groove 61, the cross section of the groove wall of the second rolling groove 67 is arranged in an arc line, and the second ball 65 rolls in the two second rolling grooves 67 in the rotating state of the second hoop 63.

Through the arrangement of the first rolling grooves 66 and the second rolling grooves 67, the first balls 64 are limited to roll in the two first rolling grooves 66, the second balls 65 are limited to roll in the two second rolling grooves 67, and the first balls 64 and the second balls 65 also play a limiting role in radial movement of the first hoop 62 and the second hoop 63, at this time, the first hoop 62 and the second hoop 63 can be arranged to be close to one side of the groove bottom of the guide groove 61, and gaps are left between the first hoop 62 and the groove bottom, so that the rotation resistance of the first hoop 62 and the second hoop 63 is further reduced, and due to the radial limiting role of the first balls 64 and the second balls 65 on the first hoop 62 and the second hoop 63, when the pump cover 2 is detached, the first balls 64, the second balls 65, the first hoop 62 and the second hoop 63 cannot fall off from the pump cover 2, and the pump cover is lost.

As an improved specific embodiment, the side of the sliding block 331 facing the outer rotor 4 is concavely provided with a second sliding slot 3311, the second sliding slot 3311 is internally connected with a sliding plate 3312 in a sliding manner, the outer contour of the sliding plate 3312 is adapted to the inner contour of the second sliding slot 3311, two sides opposite to the notch of the second sliding slot 3311 are provided with a stopper 3313 for stopping the sliding plate 3312 from sliding out of the second sliding slot 3311, a spring 3314 is arranged between the bottom of the second sliding slot 3311 and the sliding plate 3312, the spring 3314 is in a compressed state, and the sliding plate 3312 is abutted against the stopper 3313 under the elastic force of the spring 3314.

Rubber for improving sealing performance can be arranged between the sliding plate 3312 and the second sliding groove 3311, and since the inner rotor 3 rotates to a certain position, oil in the tooth grooves is sealed between the tooth grooves of the inner rotor 3 and the outer rotor 4 and is not communicated with the outside, this phenomenon is called oil trapping. As the inner rotor 3 rotates, the trapped oil volume is reduced and then increased, which causes pressure increase or vacuum phenomenon, which causes unstable pressure and damages the machine parts, through the arrangement of the second sliding slot 3311, the sliding plate 3312 and the spring 3314, the sliding plate 3312 is normally abutted against the stopper 3313 under the centrifugal force and the elastic force of the spring 3314, when the inner rotor 3 rotates to the trapped oil position, the trapped oil volume is reduced to squeeze the sliding plate 3312, which causes the sliding plate 3312 to slide to the bottom side of the second sliding slot 3311, at this time, the trapped oil volume change is offset by the sliding of the sliding plate 3312, when the inner rotor 3 continues to rotate to increase the trapped oil volume, the sliding plate 3312 slides to the notch of the second sliding slot 3311 under the elastic force of the spring 3314 until abutting against the stopper 3, at this time, the trapped oil volume change is offset by the sliding of the sliding plate 3312, therefore, the trapped oil is offset by the second sliding slot 3311, 3312, The setting of the sliding plate 3312 and the spring 3314 keeps the volume of trapped oil substantially constant, so that the pressure of trapped oil is kept stable and the machine member is not damaged by the change of trapped oil pressure.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides an oil pump, includes pump body (1), can dismantle pump cover (2) of being connected with the pump body (1), intermeshing's inner rotor (3) and outer rotor (4) and be used for supporting back shaft (5) of inner rotor (3), be provided with holding chamber (11) that are used for holding inner rotor (3) and outer rotor (4) in the pump body (1), inner rotor (3) and outer rotor (4) eccentric settings, its characterized in that: the outer edge surface of the outer rotor (4) is fixedly connected with the side wall of the containing cavity (11), the inner rotor (3) is coaxially and rotatably connected with the supporting shaft (5), one side, back to the pump cover (2), of the pump body (1) is provided with a fixing shaft (6) used for supporting the pump body (1), the fixing shaft (6) is coaxially and rotatably connected with the pump body (1), an oil inlet and outlet hole (7) is formed in the fixing shaft (6), one end, back to the pump cover (2), of the supporting shaft (5) is fixedly connected with the fixing shaft (6), the pump body (1) is coaxially and fixedly connected with a transmission gear (8) used for driving the pump body (1) to rotate, and the outer rotor (4) drives the inner rotor (3) to rotate under the rotation state of the pump body (1) driven by the transmission;

the outer side surface of the inner rotor (3) is provided with a first sliding groove (31) for containing engine oil at a concave position, the first sliding groove (31) is provided with a side slot (32) at one side close to the support shaft (5), the first sliding groove (31) is connected with a sliding piece (33) for changing the engine oil capacity in the first sliding groove (31) in a sliding way, the sliding piece (33) comprises a sliding block (331) and a guide post (332) capable of sliding in the side slot (32), the outer contour of the sliding block (331) is matched with the inner contour of the first sliding groove (31), the support shaft (5) is provided with a guide groove (61) for the guide post (332) to slide at one side close to the inner rotor (3) in a concave way, the outer diameter of the guide post (332) is matched with the groove width of the guide groove (61), and one end of each guide post (332) is fixedly connected with the sliding block (331), the other end passes side fluting (32) and slides in guide way (61), under inner rotor (3) rotating condition, a plurality of guide posts (332) all slide in guide way (61), guide way (61) become cyclic annular setting and the centre of a circle of guide way (61) and the central axis of inner rotor (3) and the central axis of outer rotor (4) are located the coplanar, the central axis of inner rotor (3) is located between the centre of a circle of guide way (61) and the central axis of outer rotor (4), guide post (332) drive sliding block (331) along the length direction sliding state of first sliding groove (31) under, machine oil capacity constantly changes in first sliding groove (31).

2. The oil pump of claim 1, wherein: and a rubber layer (333) used for enhancing the airtightness between the sliding block (331) and the first sliding groove (31) is arranged between the sliding block (331) and the first sliding groove (31), and the rubber layer (333) surrounds the sliding block (331) for a circle and is fixedly connected with the sliding block (331).

3. The oil pump of claim 1, wherein: a first hoop (62) and a second hoop (63) are arranged in the guide groove (61), the circle centers of the first hoop (62), the second hoop (63) and the guide groove (61) are all located on the same straight line, the inner diameter of the first hoop (62) is larger than that of the second hoop (63), a plurality of first balls (64) are arranged between the outer ring side walls of the first hoop (62) and the guide groove (61), the outer diameter of each first ball (64) is matched with the distance between the first hoop (62) and the outer ring side wall of the guide groove (61), the first balls (64) are distributed along the circumferential direction of the first hoop (62), a plurality of second balls (65) are arranged between the second hoop (63) and the inner ring side wall of the guide groove (61), the outer diameter of each second ball (65) is matched with the distance between the second hoop (63) and the inner ring side wall of the guide groove (61), the plurality of second balls (65) are distributed along the circumferential direction of the second hoop (63), the distance between the first hoop (62) and the second hoop (63) is matched with the outer diameter of the guide column (332), and the guide column (332) drives the first hoop (62) and the second hoop (63) to rotate in a sliding state in the guide groove (61).

4. An oil pump as set forth in claim 3, wherein: the opposite sides of the outer ring side wall of the first hoop ring (62) and the guide groove (61) are respectively provided with a first rolling groove (66) for rolling a first ball (64) in a concave mode, the first rolling grooves (66) are respectively arranged in a ring mode along the circumferential direction of the outer ring side wall of the first hoop ring (62) and the guide groove (61), the cross section of the groove wall of each first rolling groove (66) is arranged in an arc line, the first balls (64) roll in the two first rolling grooves (66) in the rotating state of the first hoop ring (62), the opposite sides of the inner ring side wall of the second hoop ring (63) and the guide groove (61) are respectively provided with a second rolling groove (67) for rolling a second ball (65) in a concave mode, the second rolling grooves (67) are respectively arranged in a ring mode along the circumferential direction of the inner ring side walls of the second hoop ring (63) and the guide groove (61), and the cross section of the groove wall of each second rolling groove (67) is arranged in an arc line, and under the rotating state of the second hoop (63), the second balls (65) roll in the two second rolling grooves (67).

5. The oil pump according to any one of claims 1 to 4, wherein: the sliding block (331) is equipped with second groove (3311) that slides towards outer rotor (4) one side all the concave, all slide in second groove (3311) and be connected with slide plate (3312), the outline of slide plate (3312) and the interior profile looks adaptation of second groove (3311) that slides, the relative both sides of notch of second groove (3311) that slides are provided with and are used for blockking slide plate (3312) from second groove (3313) that slides in, be provided with spring (3314) between the tank bottom of second groove (3311) and slide plate (3312), spring (3314) are in compression state, slide plate (3312) and dog (3313) looks butt under the elasticity effect of spring (3314).