A gearbox oil supply pump

Abstract

The present invention discloses a gearbox oil supply pump, including a pump body and a stator, wherein the stator has a shaft body, a driving gear is assembled on the shaft body, an assembly groove is formed at the inner side wall of the pump body, a driven gear is installed in the assembly groove, the stator is coaxially connected to the pump body through the shaft body, and the driving gear is meshed with the driven gear after the pump body and the stator are connected, wherein the driving gear and the driven gear are arranged on different axes, and a non-meshing gap area is formed between the driving gear and the driven gear, a flow dividing shoulder is arranged in the gap area, and a groove type that adapts to the gap area contour and the position of the gap area is formed on the inner side wall of the stator. The present invention effectively solves the wear problem of the gear and the inner side wall of the stator in the prior art by opening a groove type that adapts to the non-meshing gap area between the driving gear and the driven gear on the inner side surface of the stator, thereby improving the service life and use effect of the oil supply pump.

Description

Technical Field

[0001] The invention relates to the technical field of oil supply pumps, in particular to a gearbox oil supply pump. Background Art

[0002] The gearbox oil supply pump used in the prior art has an inner wall of a stator with a solid planar structure. As the load of the oil supply pump increases, the driving gear and the driven gear installed inside it cannot be balanced in force, and the cleanliness of the hydraulic oil is not high, resulting in serious wear of the driving gear, the driven gear and the inner wall of the stator. In the case of long-term wear, poor heat dissipation is caused, and internal leakage of the oil supply pump occurs, which leads to failure of the entire machine. Summary of the invention

[0003] The object of the present invention is to provide a transmission oil supply pump to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gearbox oil supply pump, comprising a pump body and a stator, the stator having a shaft body, a driving gear being assembled on the shaft body, an assembly groove being formed at the inner side wall of the pump body, a driven gear being installed in the assembly groove, the stator being coaxially connected to the pump body through the shaft body, and the driving gear being meshed with the driven gear after the pump body and the stator are connected, wherein the driving gear and the driven gear are arranged on different axes, and a non-meshing gap area is formed between the driving gear and the driven gear, a flow dividing shoulder is arranged in the gap area, and a groove type that matches the contour of the gap area and the position of the gap area is formed on the inner side wall of the stator.

[0005] The pump body and the stator are both axially limited at the outer side wall of the stator at a side close to the outer side wall of the stator.

[0006] The groove profile is formed by two arc-shaped side walls, including a groove inner side wall located on the inner side and a groove outer side wall located on the outer side.

[0007] The two ends of the groove are not connected to each other.

[0008] The annular contour formed by the groove-shaped inner wall on the surface located on the inner wall of the stator is located at the side wall of the driving gear after the driving gear is assembled; the annular contour formed by the groove-shaped outer wall on the surface located on the inner wall of the stator is located at the side wall of the driven gear after the driven gear is assembled.

[0009] The flow dividing shoulder is formed in the groove, and the flow dividing shoulder located in the groove divides part of the groove into a groove-type flow dividing area 1 and a groove-type flow dividing area 2 located on both sides of the flow dividing shoulder.

[0010] It can be seen from the above technical solution that the present invention provides a groove on the inner side of the stator that is adapted to the non-meshing gap area between the driving gear and the driven gear, so that the hydraulic oil can enter the groove. Under the action of pressure, the driving gear and the driven gear are always in a floating state relative to the inner wall of the stator, which effectively solves the wear problem of the gear and the inner wall of the stator in the prior art and improves the service life and use effect of the oil supply pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the inner side wall of the body of the present invention;

[0012] Figure 2 is a cross-sectional view of the inner wall of the stator of the present invention;

[0013] Figure 3 It is a side sectional view of the oil supply pump of the present invention.

[0014] In the figure: 1 pump body, 11 splitter shoulder, 12 assembly groove, 13 pump body inner wall, 14 gap area, 15 oil outlet groove type, 16 oil inlet groove type, 2 stator, 21 shaft body, 22 oil outlet, 23 oil inlet, 24 stator inner wall area one, 241 stator inner wall area two, 25 stator inner wall area three, 3 driving gear, 4 driven gear, 5 groove type, 501 groove outer wall, 502 groove inner wall, 51 groove area one, 511 first groove port, 52 groove area two, 521 groove splitter area one, 522 groove splitter area two, 53 groove area three, 531 second groove port. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings:

[0016] See also Figure 1-3 The key improvement plan of this case is to make adaptive improvements to the stator of the gearbox oil supply pump in the prior art to improve the use effect of the entire gearbox oil supply pump. Specifically, an adaptive groove 5 is opened on the inner wall of the stator 2. The groove 5 not only reduces the contact surface of the driving gear 3 and the driven gear 4 with the stator 2, but also further improves the use performance through the hydraulic oil that can flow in the groove 5, reduces the probability of internal leakage, and improves the use effect of the gearbox oil supply pump. In order to further explain the groove 5, a detailed description is given below in combination with the specific structure of the pump body 1 and the stator 2.

[0017] The pump body 1 described in this case is an annular casting. In order to adapt to the inner side wall of the stator 2, one side wall of the pump body 1 is set to a plane structure (i.e., the inner side wall 13 of the pump body), and an assembly groove 12 is opened on the side wall for assembling the driven gear 4. It should be noted that the assembly groove 12 is a circular groove structure, and a mounting hole for connecting the shaft body 21 is also opened at the bottom of the assembly groove 12. The mounting hole is arranged off-axis with the assembly groove 12. The driven gear 4 is set to an annular gear ring structure, which has inner ring teeth located on the inner ring part. After the driven gear 4 is assembled to the assembly groove 12, the assembly groove 12 limits the radial movement of the driven gear 4; at the same time, an oil outlet groove 15 and an oil inlet groove 16 connected to the assembly groove 12 are respectively formed on the inner side wall of the pump body 1, and the hydraulic oil enters from the oil inlet groove 16 and then flows out through the oil outlet groove 15. The stator 2 is adapted to be installed therewith. The side structure of the stator 2 can be understood as a T shape, including a shaft body 21 and a disk formed at the end of the shaft body 21. It should be emphasized that a groove 5 is provided on the inner wall of the disk (i.e., the inner wall of the stator 2). After the inner wall of the stator 2 is adaptively connected to the inner wall 13 of the pump body, the driving gear 3 installed on the shaft body 21 will be assembled in the assembly groove 12. At the same time, since the shaft body 21 is installed in the eccentrically arranged mounting hole at the bottom of the assembly groove 12, the driving gear 3 is arranged eccentrically with the driven gear 4 after assembly. At the same time, the driving gear 3 is partially meshed with the driven gear 4, and a gap area 14 is formed at the non-meshing position. At the same time, a diverter shoulder 11 is also provided at the gap area 14.

[0018] Below, the principle of the improvement points of this case is explained as follows:

[0019] The inner wall of the stator 2 used in the prior art is a planar structure, that is, there is no groove 5. When the stator 2 and the pump body 1 are assembled, the hydraulic oil enters the oil inlet groove 16 through the oil inlet 23, then enters the assembly groove 12 through the oil inlet groove 16 and is finally discharged from the oil outlet 22 through the oil outlet groove 15, which forms a negative pressure area near the oil inlet groove 16, a high pressure area near the oil outlet groove 15, and a normal pressure area in the middle of the gap area 14. This kind of pressure guidance makes the driving gear 3 and the driven gear 4 always in a single-sided load state, that is, the driving gear 3 and the driven gear 4 tend to fit the inner wall of the stator 2 during rotation, which leads to serious wear of the side wall on this side and internal leakage. The improvement of the present case is that a groove 5 is formed on the inner side wall of the stator 2 to match the contour of the gap area 14 and the position of the gap area 14. When the groove 5 is provided, the groove 5 will apply pressure to the direction of the position of the driving gear 3 and the driven gear 4 under the pressure of the hydraulic oil, so that the driving gear 3 and the driven gear 4 always maintain a floating state with the inner side wall of the stator 2, effectively reducing the wear of the driving gear 3 and the driven gear 4 on the stator 2 and avoiding the problem of internal leakage.

[0020] The following will provide a detailed structural description of the groove type 5:

[0021] The inner wall of the stator 2 is formed with a groove 5 that matches the outline of the gap area 14 and the position of the gap area 14. Since the setting of the groove 5 needs to meet the maximum size of the matching gap area 14, and the groove 5 needs to meet the effective axial limitation of the inner end face of the stator 2 to the driving gear 3 and the driven gear 4 after being opened, the groove 5 is set to an approximately crescent-shaped groove structure that matches the outline of the gap area 14.

[0022] See also Figure 2 ,At Figure 2In the figure, the outline of the groove 5 is formed by the arcuate side walls at both ends, including the inner groove wall 502 located on the inside and the outer groove wall 501 located on the outside. The annular outline formed by the inner groove wall 502 on the surface located on the inner wall of the stator 2 is located at the side wall of the driving gear 3 after the driving gear 3 is assembled, that is, when the axial limit of the assembled driving gear 3 is located at the annular outline; the annular outline formed by the outer groove wall 501 on the surface located on the inner wall of the stator 2 is located at the side wall of the driven gear 4 after the driven gear 4 is assembled, that is, when the axial limit of the assembled driven gear 4 is located at the annular outline; combined with the accompanying drawings, it can be seen that the inner side surface of the stator 2 is divided by the annular outline of the groove 5. The stator inner wall region 1 24 is cut into the outer ring portion and the stator inner wall region 3 25 is cut into the inner ring portion. At the same time, a stator inner wall region 241 is formed at the non-contact areas at both ends of the slot 5 to transition between the stator inner wall region 1 24 and the stator inner wall region 3 25. When the driving gear 3 is assembled on the shaft body 21 and meshes with the driven gear 4, the side wall of the driving gear 3 is limited by the stator inner wall region 3 25, and at the same time, the side wall of the driven gear 4 is limited by the stator inner wall region 1 24. In this embodiment, the groove type 5 needs to be close to the contour size of the gap area 14, so the groove type 5 is adapted to the contours of the driving gear 3 and the driven gear 4. Specifically, the stator inner wall area three 25 is set as a circular ring structure, and the diameter of the circular ring structure is smaller than the outer diameter of the driving gear 3. The stator inner wall area 1 24 is set as a circular ring structure at the contour edge of the groove outer wall 501, and the diameter of the circular ring structure is smaller than the outer diameter of the driven gear 4; it should be pointed out that due to the existence of the stator inner wall area 241, the above two circular ring structures are both non-closed annular contour lines, which are mainly used to define the contour line configuration of the groove inner wall 502 and the groove outer wall 501 located at the inner wall of the stator 2. The purpose of this is to ensure the maximization of the grooving of the groove type 5 and effectively adapt to the contour of the gap area 14.

[0023] In one embodiment, the groove type 5 is divided into groove type area 1 51, groove type area 2 52 and groove type area 3 53 according to the regional position. When the stator 2 is adapted and connected to the pump body 1, the hydraulic oil enters the oil inlet groove type 16 from the oil inlet port 23, fills the assembly groove 12 and the groove type 5, and finally flows out from the oil outlet port 22 through the oil outlet groove type 15; those skilled in the art can understand that the groove type area 1 51 is located on the side close to the oil inlet port 23, and a first groove type port 511 is formed at the end of the groove type area 1 51; the groove type area 3 53 is located on the side close to the oil outlet port 22, and a second groove type port 531 is formed at the end of the groove type area 3 53; the groove type area 2 52 is located between the groove type area 1 51 and the groove type area 3 53; the above three groove type areas are all artificially delineated area ranges, do not contain clear position boundaries, and are only used to describe their relative position relationship. When the hydraulic oil enters the oil inlet groove 16 through the oil inlet port 23, the groove area 1 51 forms a negative pressure, the groove area 2 52 forms a normal pressure, and the groove area 3 53 forms a high pressure. Due to the existence of the groove 5, the driving gear 3 and the driven gear 4 can be floated relative to the inner wall of the stator 2 by the pressure of the hydraulic oil, that is, the hydraulic oil can provide a force pointing to the direction of the driving gear 3 and the driven gear 4 after being located in the groove 5. It can also be understood that under the action of the force of the hydraulic oil, the driving gear 3 and the driven gear 4 do not contact the inner wall of the stator 2 (that is, float).

[0024] In another embodiment, the diverter shoulder 11 is formed at the groove area 2 52 of the groove 5, and the groove area 2 52 is divided into a groove diverter area 1 521 and a groove diverter area 2 522 located on both sides by the diverter shoulder 11. The two ends of the groove diverter area 1 521 and the groove diverter area 2 522 are respectively connected to the groove area 1 51 and the groove area 3 53. Similarly to the aforementioned embodiment, the groove diverter area 1 521 and the groove diverter area 2 522 are both normal pressure areas to ensure that the side pressures of the driving gear 3 and the driven gear 4 remain balanced.

[0025] It should also be noted that the groove type 5 used in practice can be adaptively opened with a preset depth, and the opening depth can be selected to be 10 mm, but is not limited thereto.

[0026] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A gearbox oil supply pump, comprising a pump body and a stator, wherein the stator has a shaft body, a driving gear is mounted on the shaft body, an assembly groove is formed on the inner side wall of the pump body, a driven gear is mounted in the assembly groove, the stator is coaxially connected to the pump body through the shaft body, and the driving gear is meshed with the driven gear after the pump body and the stator are connected, wherein: The driving gear and the driven gear are arranged on different axes, and a non-meshing gap area is formed between the driving gear and the driven gear. A splitter shoulder is provided in the gap area. It is characterized in that a groove type that adapts to the gap area contour and the position of the gap area is formed on the inner side wall of the stator.

2. A gearbox oil supply pump according to claim 1, characterized in that: The pump body and the stator are both axially limited at the outer side wall of the stator at a side close to the outer side wall of the stator.

3. The gearbox oil supply pump according to claim 1, characterized in that: The groove profile is formed by two arc-shaped side walls, including a groove inner side wall located on the inner side and a groove outer side wall located on the outer side.

4. A gearbox oil supply pump according to claim 1, characterized in that: The two ends of the groove are not connected to each other.

5. The gearbox oil supply pump according to claim 3, characterized in that: The annular contour formed by the groove-shaped inner wall on the surface located on the inner wall of the stator is located at the side wall of the driving gear after the driving gear is assembled; the annular contour formed by the groove-shaped outer wall on the surface located on the inner wall of the stator is located at the side wall of the driven gear after the driven gear is assembled.

6. The gearbox oil supply pump according to claim 1, characterized in that: The flow dividing shoulder is formed in the groove, and the flow dividing shoulder located in the groove divides part of the groove into a groove-type flow dividing area 1 and a groove-type flow dividing area 2 located on both sides of the flow dividing shoulder.

Images