CN220168146U - Gear pump with rolling bearing for supporting and positioning - Google Patents

Abstract

The utility model relates to the technical field of gear pumps, in particular to a gear pump with rolling bearings for supporting and positioning, which comprises a pump shell, wherein a driving shaft and a gear assembly are arranged in the pump shell, a sliding bearing is arranged between the driving shaft and the pump shell, the gear assembly is sleeved on the driving shaft, the gear pump also comprises the rolling bearings, the rolling bearings are arranged between the driving shaft and the pump shell, and the sliding bearing is positioned between the rolling bearings and the gear assembly. The utility model has the beneficial effects that the rolling bearing is additionally arranged to support and position the driving shaft, so that the radial positioning precision and bearing capacity are improved, the deflection is reduced, the service life is prolonged, the sliding bearing is arranged between the rolling bearing and the gear assembly, part of foreign matters can be blocked, and the radial positioning precision and the radial loading capacity are further improved; the lubricating oil film on the working surface of the sliding bearing can also absorb shock and reduce noise, so that the rotation of the driving shaft is more stable, and the vibration and abrasion of the rolling bearing are reduced.

Description

Gear pump with rolling bearing for supporting and positioning

Technical Field

The utility model relates to the technical field of gear pumps, in particular to a gear pump with a rolling bearing for supporting and positioning.

Background

The gear pump is a rotary pump which is used for transporting liquid by means of the change and movement of working volume of stroke between the pump body and the meshing gear, is pressurized by the liquid, is a part frequently used in engineering machinery, and has the advantages of high efficiency, low noise and stable oil supply. Common gear pumps include external gear pumps, internal gear pumps, double suction impeller gear pumps, external mixing gear pumps, internal and external gear pumps, and the like. Taking an internal gear pump as an example, the internal gear pump adopts the principle of internal gear engagement, the pitch circles of the internal gear and the external gear are close to one side, the other side is separated by a crescent plate on a pump cover, an active internal gear on a main shaft drives an external gear to rotate in the same direction, the gears are mutually separated at an inlet to form negative pressure so as to suck liquid, and the gears are continuously embedded and engaged at an outlet so as to squeeze the liquid to be output. The internal gear pump has compact and simple structure, small volume, strong self-priming force, large rotating speed range and convenient maintenance, and is commonly used for conveying high-viscosity liquid.

In gear pumps, particularly in internal gear pumps, the supporting mode of a rotor shaft in the gear pump mostly adopts the mode of a sliding bearing, and when the gear pump runs at high speed under the condition of high load, the sliding bearing is stressed and rubbed in one direction, abrasion is very easy to generate to reduce precision, the gear pump has the problems of poor radial positioning precision and poor radial bearing capacity of the rotor shaft, the problem of deflection and vibration of a rotor shaft and a fixed seat of the gear pump are caused, and the service life of the gear pump is shorter. In the prior art, therefore, solutions have emerged in which the sliding bearing is replaced by a rolling bearing.

However, the vibration feeling and noise of the rolling bearing in the gear pump in the prior art are relatively large, the gear pump is unstable in operation, the rolling bearing is sensitive to foreign matters such as metal scraps, and once the foreign matters enter, larger vibration and noise are intermittently generated, so that the bearing is damaged.

Disclosure of Invention

Aiming at the technical problems of poor radial positioning precision, poor radial bearing capacity, large vibration and large noise of a gear pump bearing in the prior art, the utility model provides a gear pump with a rolling bearing for supporting and positioning.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the gear pump comprises a pump shell, a driving shaft and a gear assembly are arranged in the pump shell, a sliding bearing is arranged between the driving shaft and the pump shell, the gear assembly is sleeved on the driving shaft, the gear pump further comprises a rolling bearing, the rolling bearing is arranged between the driving shaft and the pump shell, and the sliding bearing is arranged between the rolling bearing and the gear assembly.

By adopting the above structural scheme, the gear pump simultaneously has antifriction bearing and slide bearing, on the one hand, add antifriction bearing and be used for supporting the location drive shaft, can improve radial positioning accuracy and radial bearing capacity of drive shaft, and then improve radial positioning accuracy and radial bearing capacity of gear pump, reduce the beat phenomenon of drive shaft, reduce the oil leak phenomenon of gear pump, increase the life of gear pump. On the other hand, the sliding bearing is mounted between the rolling bearing and the gear assembly, which can block part of foreign matter and further improve radial positioning accuracy and radial load capacity. Moreover, the lubricating oil film on the working surface of the sliding bearing has the functions of damping, shock resistance and noise elimination, so that the rotation of the driving shaft is more stable, the vibration and abrasion of the rolling bearing are reduced, and the gear pump is more stable in operation.

As an implementation mode of the gear pump with the rolling bearing supported and positioned, the sliding bearing is in clearance fit with the driving shaft, and a first annular oil groove is formed in a clearance between the sliding bearing and the driving shaft; the gear assembly is provided with a second oil groove, the second oil groove penetrates through the gear assembly along the axial direction, one end of the second oil groove is communicated with the first oil groove, and the other end of the second oil groove is communicated with an external lubricating oil supply system.

By adopting the above structural scheme, the sliding bearing and the driving shaft adopt clearance fit, the clearance forms annular first oil groove, and the first oil groove is communicated with the second oil groove of the gear assembly, so that lubricating oil can be led to the rolling bearing according to the sequence of an external lubricating oil supply system, the second oil groove and the first oil groove, and lubrication is provided for the rolling bearing, thereby improving the lubricating performance and reducing the vibration noise.

As an implementation mode of the gear pump for supporting and positioning the rolling bearing, the gear assembly comprises an external gear and an internal gear, wherein the internal gear is meshed with the external gear, the external gear and the internal gear are eccentrically arranged, and the internal gear is fixedly sleeved on the driving shaft; the pump shell is fixedly provided with an oil distribution disc, the oil distribution disc is positioned on one side, far away from the sliding bearing, of the gear assembly, a third oil groove is formed in the oil distribution disc, the third oil groove penetrates through the oil distribution disc along the axial direction, one end of the third oil groove is communicated with an external lubricating oil supply system, and in the rotating process of an inner gear, the other end of the third oil groove can be communicated with the second oil groove.

By adopting the above structure scheme, the gear pump is the crescent gear pump, and it has the third oil groove to open on the oil distribution disc of crescent gear pump, and on the internal gear was seted up to the second oil groove, outside lubricating oil feeding system's lubricating oil can let in the third oil groove, and when internal gear rotated the in-process, the third oil groove was link up with the second oil groove, and lubricating oil can get into the second oil groove by the third oil groove, and then can follow the second oil groove and let in first oil groove, then reached antifriction bearing department, lubricate antifriction bearing.

As an implementation of a gear pump with a rolling bearing supported and positioned, the rolling bearing is a needle bearing and/or the sliding bearing is an oil bearing.

By adopting the structural scheme, the needle bearing is thin and long, the area of the radial section is smaller, but the needle bearing still has higher load capacity, and the needle bearing is particularly suitable for gear pumps with compact structure, narrow internal space and limited radial installation size, in particular to internal gear pumps. The oil-retaining bearing is a sintered body which is made of metal powder as a main raw material and is made by a powder metallurgy method, the oil-retaining bearing is porous, the number, the size, the shape and the distribution of pores can be freely adjusted in the manufacturing process, and the oil-retaining bearing can provide partial lubricating oil for the needle bearing, so that the needle bearing is always in a state of sufficient lubrication, and simultaneously, the oil pressure can be reduced, and the working load of a sealing element in a gear pump can be reduced.

As an implementation mode of the gear pump with the rolling bearing supported and positioned, a sealing piece is arranged on the pump shell, and the sealing piece is positioned at one end of the rolling bearing far away from the sliding bearing; the pump shell is provided with a mounting hole for penetrating the driving shaft, the mounting hole is provided with a reducing part, the radial dimension of the reducing part is outwards enlarged, the reducing part is arranged between the rolling bearing and the sealing piece, the large-diameter end of the reducing part faces the sealing piece, and the large-diameter end and the outer peripheral surface of the driving shaft form a fourth oil groove; the pump shell is provided with a fifth oil groove communicated with the outside, and the fifth oil groove is communicated with the fourth oil groove.

By adopting the above structural scheme, if the lubricating oil at the position of the rolling bearing is too much, the lubricating oil can be discharged through the fourth oil groove and the fifth oil groove in sequence, so that the lubricating oil is prevented from accumulating, the overlarge oil pressure of the lubricating oil is avoided, and the working load of the sealing element is reduced.

As an implementation mode of the gear pump for supporting and positioning the rolling bearing, the oil distribution plate is provided with a sixth oil groove, the sixth oil groove penetrates through the oil distribution plate along the axial direction, one end of the sixth oil groove is communicated with the fifth oil groove, and the other end of the sixth oil groove is communicated with the outside.

By adopting the above structure scheme, when the lubricating oil is discharged, the lubricating oil can be discharged through the fourth oil groove, the fifth oil groove and the sixth oil groove in sequence, and the oil distribution disc is simultaneously provided with the sixth oil groove for discharging the oil and the third oil groove for feeding the oil, so that the inlet and the outlet of the lubricating oil are at one end of the oil distribution disc, the structure is compact, and the design of a lubricating oil path is convenient.

As an implementation mode of the gear pump for supporting and positioning the rolling bearing, the fourth oil groove is annular.

By adopting the above structural scheme, the fourth oil groove is annular, so that the processing of the reducing part is facilitated, the aperture of the part mounting hole is enlarged, the oil discharge volume can be increased, and the accumulation of lubricating oil is avoided.

The utility model has the beneficial effects that:

1. the rolling bearing is additionally arranged in the traditional gear pump to support and position the driving shaft, so that the radial positioning precision and the radial bearing capacity of the driving shaft can be improved, the radial positioning precision and the radial bearing capacity of the gear pump are further improved, the deflection phenomenon of the driving shaft is reduced, the oil leakage phenomenon of the gear pump is reduced, and the service life of the gear pump is prolonged.

2. The sliding bearing is arranged between the rolling bearing and the gear assembly, so that part of foreign matters can be blocked, the radial positioning precision and the radial loading capacity are further improved, the vibration and the abrasion of the rolling bearing are reduced, and the rotation of the driving shaft is more stable.

3. The lubricating oil film on the working surface of the sliding bearing has the functions of damping, shock resistance and noise elimination, so that the rotation of the driving shaft is more stable, the vibration and abrasion of the rolling bearing are reduced, and the gear pump is more stable in operation.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a semi-sectional structure of an embodiment of the present utility model;

FIG. 2 is a schematic view of a half-section of a pump housing according to an embodiment of the present utility model;

FIG. 3 is a schematic perspective view of a pump housing according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a semi-sectional structure of an embodiment of the present utility model;

FIG. 5 is a schematic view of a partial semi-sectional structure of an embodiment of the present utility model;

FIG. 6 is a schematic perspective view of a part of the structure of the embodiment of the present utility model;

FIG. 7 is a schematic elevational view of the oil distribution plate in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic elevational view of a portion of the structure of an embodiment of the present utility model;

FIG. 9 is a schematic view of a radial cross-section of a portion of the structure in accordance with an embodiment of the present utility model;

fig. 10 is a schematic perspective view of an internal gear in an embodiment of the present utility model;

reference numerals illustrate:

1. a pump housing; 11. a sliding bearing; 111. a first oil groove; 12. a rolling bearing; 13. a seal; 14. a variable diameter portion; 141. a fourth oil groove; 15. a fifth oil groove;

2. a fixing seat; 21. an oil inlet; 22. an oil outlet; 23. a mounting groove;

3. a seal ring;

4. a drive shaft;

5. a gear assembly; 51. an internal gear; 511. a second oil groove; 52. an external gear; 53. an oil suction cavity; 54. an oil discharge chamber;

6. a crescent plate;

7. an oil distribution tray; 71. a third oil groove; 72. a sixth oil groove; 73. an oil suction port; 74. an oil drain port;

arrow x. Direction of rotation of the internal gear.

Detailed Description

In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the utility model are intended to be within the scope of the patent protection.

Referring to fig. 1-10, the present embodiment provides a gear pump with a rolling bearing supported in position, which is an internal gear pump, but may be in other forms in other embodiments.

The embodiment comprises a pump shell 1, wherein the pump shell 1 is fixedly arranged in an installation groove 23 of a fixed seat 2, a sealing ring 3 is arranged on the outer wall of the pump shell 1, the sealing ring 3 is in interference fit with the inner wall of the fixed seat 2, and the sealing ring 3 can be an O-shaped sealing ring 3 or other forms of sealing rings 3; the pump shell 1 is provided with a mounting hole for mounting the driving shaft 4, the gear assembly 5 is mounted in the pump shell 1, the gear assembly 5 comprises an external gear 52 and an internal gear 51, the internal gear 52 is meshed with the internal gear 51, the internal gear 51 is fixedly sleeved on the driving shaft 4, the external gear 52 and the internal gear 51 are eccentrically arranged, the internal gear 51 forms a cavity with the other side wall in the external gear 52, a crescent plate 6 is arranged in the cavity, the crescent plate 6 is mounted in the pump shell 1, the cavity is divided into an oil suction cavity 53 and an oil discharge cavity 54 by the crescent plate 6, specifically, referring to fig. 9, the internal gear 51 rotates anticlockwise along an arrow X, the gear teeth of the internal gear 51 and the external gear 52 are continuously embedded and meshed with each other to form an oil discharge cavity 54, and the gear teeth of the internal gear 51 and the external gear 52 are continuously separated to form an oil suction cavity 53; the oil distribution disc 7 is fixedly arranged on the pump shell 1, the oil distribution disc 7 is provided with an oil suction port 73 and an oil discharge port 74, the oil suction port 73 is communicated with the oil suction cavity 53, the oil discharge port 74 is communicated with the oil discharge cavity 54, in the embodiment, the oil distribution disc 7 is fixedly connected with the pump shell 1 through bolts, and in other embodiments, the oil distribution disc 7 can be connected through other fixed connection modes; the oil distribution disc 7 is positioned between the fixed seat 2 and the pump shell 1, a sliding bearing 11, a rolling bearing 12 and a sealing piece 13 are arranged between the pump shell 1 and the driving shaft 4, the sliding bearing 11, the rolling bearing 12 and the sealing piece 13 are sleeved on the driving shaft 4, and the oil distribution disc 7, the internal gear 51, the sliding bearing 11, the rolling bearing 12 and the sealing piece 13 are sequentially distributed along the axial direction of the driving shaft 4; the rolling bearing 12 is in interference fit with the pump shell 1, the rolling bearing 12 can be a needle bearing, and in other embodiments, the rolling bearing 12 can also be other kinds of rolling bearings 12; the sliding bearing 11 is in interference fit with the pump housing 1, the sliding bearing 11 may be an oil-containing bearing, and in other embodiments, the sliding bearing 11 may be another kind of sliding bearing 11; the sealing piece 13 is a framework sealing ring, the framework sealing ring is in interference fit with the pump shell 1, and the framework sealing ring is also in interference fit with the driving shaft 4.

In order to lubricate the rolling bearing 12 and reduce vibration noise, the embodiment is provided with a lubrication oil path of lubricating oil, and the specific scheme is as follows: the sliding bearing 11 is in clearance fit with the driving shaft 4, and a first annular oil groove 111 is formed in a clearance between the sliding bearing 11 and the driving shaft 4; the internal gear 51 is provided with a second oil groove 511, the second oil groove 511 penetrates the internal gear 51 along the axial direction, and the second oil groove 511 penetrates the first oil groove 111; the oil distribution disc 7 is provided with a third oil groove 71, the third oil groove 71 penetrates through the oil distribution disc 7 along the axial direction, and the third oil groove 71 can penetrate through the second oil groove 511 in the rotation process of the inner gear 51; the fixed seat 2 is provided with an oil inlet 21, one end of the oil inlet 21 is communicated with the third oil groove 71, and the other end is communicated with an external lubricating oil supply system; in this way, the oil inlet 21, the third oil groove 71, the second oil groove 511 and the first oil groove 111 form a lubrication passage for the rolling bearing 12, so that the lubrication oil can be passed from the external lubrication oil supply system to the rolling bearing 12 in the order of the oil inlet 21, the third oil groove 71, the second oil groove 511, the first oil groove 111, providing lubrication for the rolling bearing 12.

From above, the lubrication path of the lubricating oil in this embodiment is: the oil inlet 21, the third oil groove 71, the second oil groove 511, the first oil groove 111, the rolling bearing 12 of the fixing base 2. The lubricating oil can timely provide lubrication for the rolling bearing 12 through the lubricating path, so that the rolling bearing 12 is in a state of sufficient lubrication.

In order to avoid accumulation of lubricating oil in the gear pump, the embodiment is also provided with a discharge oil path of lubricating oil, and the specific scheme is as follows: the mounting hole is provided with a reducing part 14, the radial dimension of the reducing part 14 is enlarged outwards, the reducing part 14 is arranged between the rolling bearing 12 and the sealing element 13, the large diameter end of the reducing part 14 is arranged towards the sealing element 13, and the large diameter end and the outer peripheral surface of the driving shaft 4 form an annular fourth oil groove 141; the pump shell 1 is provided with a fifth oil groove 15, and the fifth oil groove 15 is communicated with a fourth oil groove 141; the oil distribution disc 7 is further provided with a sixth oil groove 72, the sixth oil groove 72 penetrates through the oil distribution disc 7 along the axial direction, the fixed seat 2 is further provided with an oil outlet 22, one end of the sixth oil groove 72 is communicated with the fifth oil groove 15, the other end of the sixth oil groove 72 is communicated with the oil outlet 22 of the fixed seat 2, and then is communicated with an external lubricating oil supply system again through a circulating pipeline or is directly communicated with the outside to discharge lubricating oil, so that the fourth oil groove 141, the fifth oil groove 15, the sixth oil groove 72 and the oil outlet 22 form a lubricating oil discharge path.

From above, the oil drainage path of the lubricating oil in this embodiment is: rolling bearing 12, fourth oil groove 141, fifth oil groove 15, sixth oil groove 72, and oil outlet 22 of holder 2. If the lubricating oil at the position of the rolling bearing 12 is excessive, the lubricating oil can be discharged in an oil discharge path, so that the accumulation of the lubricating oil is prevented, the excessive oil pressure of the lubricating oil is avoided, and the working load of the sealing member 13 is reduced.

In this embodiment, the gear pump has antifriction bearing 12 and slide bearing 11 simultaneously, on the one hand, add antifriction bearing 12 and be used for supporting location drive shaft 4, can improve radial positioning accuracy and radial bearing capacity of drive shaft 4, and then improve radial positioning accuracy and radial bearing capacity of gear pump, reduce the beat phenomenon of drive shaft 4, reduce the oil leak phenomenon of gear pump, increase gear pump's life. On the other hand, the sliding bearing 11 is mounted between the rolling bearing 12 and the internal gear 51, and can block part of foreign matters such as metal scraps generated by friction of the teeth of the internal gear 51 and the external gear 52, and further improve radial positioning accuracy and radial load capacity, reduce vibration and wear of the rolling bearing 12, and make rotation of the drive shaft 4 more stable. In addition, the lubricating oil film on the working surface of the sliding bearing 11 has the functions of shock absorption, shock resistance and noise elimination, so that the rotation of the driving shaft 4 can be more stable, the vibration, the abrasion and the running noise of the rolling bearing 12 are reduced, and the gear pump can be more stable to run.

In the present embodiment, the rolling bearing 12 is a needle bearing, which is thin and long, has a small area in radial cross section, but still has high load capacity, and is particularly suitable for gear pumps, particularly internal gear pumps, which are compact in structure, narrow in inner space, and limited in radial installation size. In other embodiments, the rolling bearing 12 may also be a ball bearing, a ball bearing.

In this embodiment, the sliding bearing 11 is an oil-containing bearing, which is a sintered body made of metal powder as a main raw material and manufactured by a powder metallurgy method, the oil-containing bearing is porous, the number, size, shape and distribution of pores can be freely adjusted in the manufacturing process, and the oil-containing bearing can provide part of lubricating oil for the needle bearing, so that the needle bearing is always in a state of sufficient lubrication, and simultaneously, the oil pressure can be reduced, and the work load of the sealing member 13 in the gear pump can be reduced.

In this embodiment, the oil inlet 21 and the oil outlet 22 are simultaneously formed on the fixing base 2, and the third oil groove 71 for oil inlet and the sixth oil groove 72 for oil discharge are simultaneously formed on the oil distribution disc 7, so that the lubricating oil can enter and exit at the same end of the gear pump, the structure is compact, and the design of the lubricating oil circulation pipeline is convenient.

In this embodiment, the fourth oil groove 141 is annular, which is convenient for the processing of the reducing portion 14, and can enlarge the aperture of the partial mounting hole, and can increase the volume of oil discharge, thereby avoiding the accumulation of lubricating oil.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The utility model provides a gear pump of antifriction bearing support location, includes pump case (1), installs drive shaft (4) and gear assembly (5) in pump case (1), installs slide bearing (11) between drive shaft (4) and pump case (1), and gear assembly (5) cover is located drive shaft (4), its characterized in that:

the gear pump further comprises a rolling bearing (12), the rolling bearing (12) is arranged between the driving shaft (4) and the pump shell (1), and the sliding bearing (11) is arranged between the rolling bearing (12) and the gear assembly (5).

2. Gear pump with rolling bearing support positioning according to claim 1, characterized in that the sliding bearing (11) is in clearance fit with the drive shaft (4), the clearance between the sliding bearing (11) and the drive shaft (4) forming a first annular oil groove (111); the gear assembly (5) is provided with a second oil groove (511), the second oil groove (511) penetrates through the gear assembly (5) along the axial direction, one end of the second oil groove (511) is communicated with the first oil groove (111), and the other end of the second oil groove is communicated with an external lubricating oil supply system.

3. Gear pump with rolling bearing support positioning according to claim 2, characterized in that the gear assembly (5) comprises an external gear (52) and an internal gear (51), the internal gear (51) is meshed with the external gear (52), the external gear (52) and the internal gear (51) are eccentrically arranged, and the internal gear (51) is fixedly sleeved on the driving shaft (4); pump case (1) fixed mounting has and joins in marriage food tray (7), and it is located one side that slide bearing (11) was kept away from to gear assembly (5) to join in marriage food tray (7), and it has third oil groove (71) to join in marriage food tray (7) to open, and third oil groove (71) run through in axial direction to join in marriage food tray (7), and one end and the outside lubricating oil feeding system intercommunication of third oil groove (71), and in-process is rotated in gear (51), and the other end of third oil groove (71) can link up with second oil groove (511).

4. A gear pump with a rolling bearing support positioning according to claim 1 or 2 or 3, characterized in that the rolling bearing (12) is a needle bearing and/or the sliding bearing (11) is an oil bearing.

5. A gear pump with a rolling bearing support positioning according to claim 2 or 3, characterized in that the pump housing (1) is fitted with a seal (13), the seal (13) being located at the end of the rolling bearing (12) remote from the sliding bearing (11); the pump shell (1) is provided with a mounting hole for penetrating the driving shaft (4), the mounting hole is provided with a reducing part (14), the radial dimension of the reducing part (14) is expanded outwards, the reducing part (14) is arranged between the rolling bearing (12) and the sealing piece (13), the large-diameter end of the reducing part (14) is arranged towards the sealing piece (13), and the large-diameter end and the outer peripheral surface of the driving shaft (4) form a fourth oil groove (141); the pump shell (1) is provided with a fifth oil groove (15) communicated with the outside, and the fifth oil groove (15) is communicated with a fourth oil groove (141).

6. Gear pump with rolling bearing support positioning according to claim 5, characterized in that the oil distribution disc (7) is provided with a sixth oil groove (72), the sixth oil groove (72) penetrates the oil distribution disc (7) in the axial direction, one end of the sixth oil groove (72) is communicated with the fifth oil groove (15), and the other end is communicated with the outside.

7. Gear pump with rolling bearing support positioning according to claim 5, characterized in that the fourth oil groove (141) is annular.