Mechanism for preventing radial deviation of oil pump shaft

Abstract

The utility model relates to the field of oil pumps, in particular to a mechanism for preventing radial deviation of an oil pump shaft, which comprises the oil pump shaft, the oil pump shaft is arranged in a pump shell, one end of the oil pump shaft is sleeved with an inner rotor, the oil pump shaft is sleeved with a bearing, the inner rotor is provided with a limiting concave part or a limiting convex part, and the bearing is sleeved with a bearing. And a positioning convex part or a positioning concave part matched with the limiting concave part or the limiting convex part is arranged in the pump shell, and the positioning convex part or the limiting convex part is inserted into the limiting concave part or the positioning concave part to limit the position deviation of the inner rotor, so that the radial deviation of the oil pump shaft is prevented. According to the mechanism for preventing the oil pump shaft from radially deviating, the position of the inner rotor can be precisely limited, the oil pump shaft is effectively prevented from radially deviating under high oil pressure, and therefore the service life of a bearing is remarkably prolonged.

Description

Technical Field

[0001] This utility model relates to the field of oil pumps, and in particular to a mechanism for preventing radial displacement of the oil pump shaft. Background Technology

[0002] In applications of electronic oil pumps, the stability and reliability of their performance are crucial. However, existing electronic oil pumps, under high oil pressure conditions, such as... Figure 1 As shown, the oil pump shaft will experience radial displacement under high oil pressure pulsation. When the oil pump shaft experiences radial displacement, the bearings mounted on it will bear a load far exceeding the normal range.

[0003] Feedback from practical applications indicates that this problem has caused extremely serious consequences. For example... Figure 2 The diagram of bearing failure in the prior art clearly shows a sharp increase in bearing wear and a significant decrease in durability. Excessive bearing wear not only affects the normal operation of the electronic oil pump and increases the equipment failure rate, but also significantly shortens the overall service life of the electronic oil pump and increases operating costs. This problem is particularly prominent in fields with high requirements for operational stability and maintenance costs. Therefore, developing a mechanism that can effectively prevent radial misalignment of the oil pump shaft is urgently needed and has significant practical implications for improving the performance of electronic oil pumps and reducing maintenance costs. Utility Model Content

[0004] In view of the above-mentioned shortcomings of current electronic oil pumps, this utility model provides a mechanism to prevent radial displacement of the oil pump shaft, which can accurately limit the position of the inner rotor and effectively prevent radial displacement of the oil pump shaft under high oil pressure, thereby improving the service life of the bearing.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0006] A mechanism for preventing radial displacement of an oil pump shaft includes an oil pump shaft disposed within a pump housing. An inner rotor is fitted onto one end of the oil pump shaft, and a bearing is fitted onto the oil pump shaft. A limiting recess or a limiting protrusion is provided on the inner rotor. A positioning protrusion or a positioning recess is provided within the pump housing to match the limiting recess or the limiting protrusion. The positioning protrusion or the limiting protrusion is inserted into the limiting recess or the positioning recess to limit the positional displacement of the inner rotor, thereby preventing radial displacement of the oil pump shaft.

[0007] According to one aspect of the present invention, the pump housing includes a pump cover and a pump body disposed on the pump cover.

[0008] According to one aspect of the present invention, the inner rotor is provided with a limiting recess on one side of the pump cover, and the pump cover is provided with a positioning boss that matches the limiting recess, and the positioning boss is engaged with the limiting recess.

[0009] According to one aspect of the present invention, the inner rotor is provided with a limiting recess on one side of the pump cover, the pump cover is provided with a positioning groove, a bushing is provided in the positioning groove, and the bushing is engaged with the limiting recess.

[0010] According to one aspect of the present invention, the inner rotor is provided with a limiting recess on one side of the pump body, and the pump body is provided with a positioning flange that matches the limiting recess, and the positioning flange is engaged with the limiting recess.

[0011] According to one aspect of the present invention, the inner rotor is provided with a limiting recess on one side of the pump body, the pump body is provided with a positioning recess, a bushing is provided in the positioning recess, and the bushing is engaged with the limiting recess.

[0012] According to one aspect of the present invention, the inner rotor is provided with a limiting protrusion on one side of the pump cover, and the pump cover is provided with a positioning groove that matches the limiting protrusion, and the limiting protrusion is inserted into the positioning groove.

[0013] According to one aspect of the present invention, the inner rotor is provided with a limiting protrusion on one side of the pump body, and the pump body is provided with a positioning recess that matches the limiting protrusion, the limiting protrusion being inserted into the positioning recess.

[0014] According to one aspect of the present invention, an outer rotor is meshed with the inner rotor.

[0015] According to one aspect of the present invention, the limiting recess or limiting protrusion is configured to be circular.

[0016] The advantages of this invention are as follows: By inserting the positioning protrusion or limiting protrusion into the limiting recess or positioning recess, the position of the inner rotor can be precisely defined, avoiding its influence from high oil pressure pulsation and preventing positional displacement. This ensures that the oil pump shaft will not experience radial displacement under high oil pressure, guaranteeing stable rotation of the oil pump shaft and inner rotor within the pump housing. It also reduces friction and collision between the inner and outer rotors and the pump housing, lowering the wear of various components and extending the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components. This reduces maintenance and replacement costs and improves the overall reliability and durability of the oil pump. Simultaneously, because radial displacement of the oil pump shaft under high oil pressure is prevented, the load on the bearings is correspondingly reduced, further improving the bearing durability. The mechanism provided by this invention for preventing radial displacement of the oil pump shaft can precisely define the position of the inner rotor, effectively preventing radial displacement of the oil pump shaft under high oil pressure, thereby significantly improving the service life of the bearings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the radial offset of the electronic oil pump shaft in the prior art described in this utility model;

[0019] Figure 2 This is a schematic diagram of a bearing failure case described in this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of an electronic oil pump according to the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment 2 of this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment 3 of this utility model;

[0023] Figure 6 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment 4 of this utility model;

[0024] Figure 7 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment 5 of this utility model;

[0025] Figure 8 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment Six of this utility model;

[0026] Figure 9 This is a cross-sectional schematic diagram of a mechanism for preventing radial displacement of the oil pump shaft according to Embodiment 7 of this utility model.

[0027] The names corresponding to the serial numbers in the diagram are as follows:

[0028] 1. Oil pump shaft; 2. Bearing; 3. Inner rotor; 31. Limiting recess; 32. Limiting protrusion; 33. Shaft hole; 4. Outer rotor; 5. Pump housing; 51. Pump cover; 511. Positioning boss; 512. Positioning groove; 52. Pump body; 522. Positioning flange; 521. Positioning recess; 6. Bushing. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] Example 1

[0033] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used in oil pumps, especially in electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1. The inner rotor 3 is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1. An outer rotor 4 is fitted onto the inner rotor 3. The inner rotor 3 and the outer rotor 4 are meshed together. A limiting recess or a limiting protrusion is provided on the inner rotor 3. A positioning protrusion or a positioning recess is provided within the pump housing 5 to match the limiting recess or the limiting protrusion. The positioning protrusion or the limiting protrusion is inserted into the limiting recess or the positioning recess to limit the positional displacement of the inner rotor 3, thereby preventing radial displacement of the oil pump shaft 1. By inserting the protrusion or limiting protrusion into the corresponding limiting recess or positioning recess, the inner rotor 3 is ensured to be precisely fixed in the predetermined position. This reduces the possibility of it shifting under the influence of high oil pressure pulsation, ensures that the oil pump shaft does not shift radially (in the Y-axis direction) under high oil pressure, thereby reducing the load on the bearing and improving the bearing durability.

[0034] Preferably, the limiting recess or limiting protrusion is designed to be circular to facilitate the smooth rotation of the oil pump shaft 1 and the inner rotor 3.

[0035] The beneficial effects of this embodiment are as follows:

[0036] By cooperating with the limiting recess or limiting protrusion and the positioning protrusion or positioning recess, the position of the inner rotor can be precisely defined, avoiding the influence of high oil pressure pulsation, preventing positional deviation, ensuring that the oil pump shaft will not have radial deviation under high oil pressure, reducing the load on the bearing, and thus improving the durability of the bearing.

[0037] Example 2

[0038] like Figure 4As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside an oil pump, especially suitable for electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1 and is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1 and is disposed above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting recess 31 is provided on one side of the inner rotor 3 located on the pump cover 51. A positioning boss 511, matching the limiting recess 31, is provided on the pump cover 51 and is engaged with the limiting recess 31. That is, the limiting boss 511 is inserted into the limiting protrusion 31; preferably, the positioning boss 511 and the limiting boss 511 are round, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0039] The beneficial effects of this embodiment are as follows: the matching connection between the limiting recess 31 and the positioning boss 511 can accurately limit the position of the inner rotor, effectively preventing radial displacement of the oil pump shaft under high oil pressure, ensuring stable rotation of the oil pump shaft and inner rotor within the pump housing, reducing friction and collision between the inner rotor, outer rotor, and pump housing, reducing the wear of various components, thereby extending the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components, reducing maintenance and replacement costs, and improving the overall reliability and durability of the oil pump. Simultaneously, by preventing radial displacement of the oil pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the durability of the bearings.

[0040] Example 3

[0041] like Figure 5 As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside oil pumps, especially electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1, and the inner rotor is located in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1, and the bearing 2 is positioned above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting recess 31 is provided on one side of the inner rotor 3 located within the pump cover 51. A positioning groove 512 is provided on the pump cover 51, and a bushing 6 is disposed within the positioning groove 512. The bushing 6 is engaged with the limiting recess 31. That is, the bushing 6 is disposed within the limiting recess 31 and the positioning groove 512.

[0042] Preferably, the positioning groove 512, the limiting groove 31, and the bushing 6 are circular, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0043] The beneficial effects of this embodiment are as follows: By setting the bushing, positioning groove, and limiting recess, the position of the inner rotor 3 can be precisely defined, reducing friction and collision between the inner rotor and the pump housing, and reducing the wear of various components. This extends the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components, reduces maintenance and replacement costs, and improves the overall reliability and durability of the oil pump. Simultaneously, by preventing radial displacement of the oil pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the durability of the bearings.

[0044] Example 4:

[0045] like Figure 6 As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside an oil pump, especially suitable for electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1 and is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1 and is disposed above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting recess 31 is provided on one side of the inner rotor 3 located within the pump body 52. ​​A positioning flange 522 matching the limiting recess 31 is provided on the pump body 52, and the positioning flange 522 is engaged with the limiting recess 31.

[0046] Preferably, the positioning flange 522 and the limiting recess 31 are circular, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0047] The beneficial effects of this embodiment are as follows: By inserting the positioning flange 522 into the limiting recess 31, the position of the inner rotor can be precisely defined, effectively preventing radial displacement of the oil pump shaft under high oil pressure. This ensures stable rotation of the oil pump shaft and the inner rotor within the pump housing, reduces friction and collision between the inner and outer rotors and the pump housing, lowers the wear of various components, and thus extends the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components. This reduces maintenance and replacement costs and improves the overall reliability and durability of the oil pump. Simultaneously, by preventing radial displacement of the oil pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the durability of the bearings.

[0048] Example 5

[0049] like Figure 7 As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside oil pumps, especially electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1, and the inner rotor is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1, and the bearing 2 is disposed above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting recess 31 is provided on one side of the inner rotor 3 located within the pump body 52. ​​A positioning recess 521 is provided on the pump body 52, and a bushing 6 is disposed within the positioning recess 521. The bushing 6 is engaged with the limiting recess 31. That is, the bushing 6 is disposed within the limiting recess 31 and the positioning recess 521.

[0050] Preferably, the positioning recess 521, the limiting recess 31, and the bushing 6 are circular, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0051] The beneficial effects of this embodiment are as follows: By setting the positioning recess, limiting recess, and bushing, the position of the inner rotor can be precisely defined, reducing friction and collision between the inner rotor and the pump housing, and decreasing the wear of various components. This extends the service life of the pump shaft, inner rotor, outer rotor, pump housing, and other related components, reduces maintenance and replacement costs, and improves the overall reliability and durability of the pump. Simultaneously, by preventing radial displacement of the pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the bearing durability.

[0052] Example 6

[0053] like Figure 8 As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside oil pumps, especially electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1 and is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1 and is positioned above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting protrusion 32 is provided on one side of the pump cover 51 of the inner rotor 3. A positioning groove 512 matching the limiting protrusion 32 is provided on the pump cover 51, and the limiting protrusion 32 is inserted into the positioning groove 512.

[0054] Preferably, the limiting protrusion 32 and the positioning groove 512 are circular, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0055] The beneficial effects of this embodiment are as follows: By inserting the limiting protrusion into the positioning groove, the position of the inner rotor can be precisely defined, effectively preventing radial displacement of the oil pump shaft under high oil pressure. This ensures stable rotation of the oil pump shaft and inner rotor within the pump housing, reduces friction and collision between the inner and outer rotors and the pump housing, lowers the wear of various components, and thus extends the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components. This reduces maintenance and replacement costs and improves the overall reliability and durability of the oil pump. Simultaneously, by preventing radial displacement of the oil pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the durability of the bearings.

[0056] Example 7

[0057] like Figure 9 As shown, a mechanism for preventing radial displacement of an oil pump shaft is mainly used inside oil pumps, especially suitable for electronic oil pumps. It includes an oil pump shaft 1, which is disposed within a pump housing 5. The pump housing 5 includes a pump cover 51 and a pump body 52 disposed on the pump cover 51. The oil pump shaft 1 rotates within the pump housing under the drive of a drive component. An inner rotor 3 is fitted onto one end of the oil pump shaft 1 and is disposed in a pump chamber inside the pump housing 5. A bearing 2 is fitted onto the oil pump shaft 1 and is disposed above the inner rotor 3. An outer rotor 4 is fitted onto the inner rotor 3, and the inner rotor 3 and the outer rotor 4 are meshed together. A limiting protrusion 32 is provided on one side of the inner rotor 3 located within the pump body 52. ​​A positioning recess 521 matching the limiting protrusion 32 is provided on the pump body 52, and the limiting protrusion 32 is inserted into the positioning recess 521.

[0058] Preferably, the limiting protrusion 32 and the positioning recess 521 are circular, so that they can achieve limiting while ensuring smooth rotation of the inner rotor.

[0059] The beneficial effects of this embodiment are as follows: By inserting the limiting protrusion 32 into the positioning recess 521, the position of the inner rotor can be precisely defined, effectively preventing radial displacement of the oil pump shaft under high oil pressure. This ensures stable rotation of the oil pump shaft and the inner rotor within the pump housing, reduces friction and collision between the inner and outer rotors and the pump housing, lowers the wear of various components, and thus extends the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components. This reduces maintenance and replacement costs and improves the overall reliability and durability of the oil pump. Simultaneously, by preventing radial displacement of the oil pump shaft under high oil pressure, the load on the bearings is reduced, thereby improving the durability of the bearings.

[0060] The advantages of this invention are as follows: By inserting the positioning protrusion or limiting protrusion into the limiting recess or positioning recess, the position of the inner rotor can be precisely defined, avoiding its influence from high oil pressure pulsation and preventing positional displacement. This ensures that the oil pump shaft will not experience radial displacement under high oil pressure, guaranteeing stable rotation of the oil pump shaft and inner rotor within the pump housing. It also reduces friction and collision between the inner and outer rotors and the pump housing, lowering the wear of various components and extending the service life of the oil pump shaft, inner rotor, outer rotor, pump housing, and other related components. This reduces maintenance and replacement costs and improves the overall reliability and durability of the oil pump. Simultaneously, because radial displacement of the oil pump shaft under high oil pressure is prevented, the load on the bearings is correspondingly reduced, further improving the bearing durability. The mechanism provided by this invention for preventing radial displacement of the oil pump shaft can precisely define the position of the inner rotor, effectively preventing radial displacement of the oil pump shaft under high oil pressure, thereby significantly improving the service life of the bearings.

[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A mechanism for preventing radial displacement of an oil pump shaft, comprising an oil pump shaft (1), the oil pump shaft (1) being disposed within a pump housing (5), an inner rotor (3) being sleeved at one end of the oil pump shaft (1), and a bearing (2) being sleeved on the oil pump shaft (1), characterized in that, The inner rotor (3) is provided with a limiting recess or a limiting protrusion, and the pump housing (5) is provided with a positioning protrusion or a positioning recess that matches the limiting recess or the limiting protrusion. The positioning protrusion or the limiting protrusion is inserted into the limiting recess or the positioning recess to limit the positional displacement of the inner rotor (3), thereby preventing the oil pump shaft (1) from radially shifting.

2. The mechanism for preventing radial displacement of the oil pump shaft according to claim 1, characterized in that, The pump casing (5) includes a pump cover (51) and a pump body (52) disposed on the pump cover (51).

3. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting recess (31) on one side of the pump cover (51). The pump cover (51) is provided with a positioning boss (511) that matches the limiting recess (31). The positioning boss (511) is connected to the limiting recess (31).

4. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting recess (31) on one side of the pump cover (51). The pump cover (51) is provided with a positioning groove (512). A bushing (6) is provided in the positioning groove (512). The bushing (6) is connected to the limiting recess (31).

5. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting recess (31) on one side of the pump body (52). The pump body (52) is provided with a positioning flange (522) that matches the limiting recess (31). The positioning flange (522) is connected to the limiting recess (31).

6. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting recess (31) on one side of the pump body (52). The pump body (52) is provided with a positioning recess (521). A bushing (6) is provided inside the positioning recess (521). The bushing (6) is connected to the limiting recess (31).

7. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting protrusion (32) on one side of the pump cover (51). The pump cover (51) is provided with a positioning groove (512) that matches the limiting protrusion (32). The limiting protrusion (32) is inserted into the positioning groove (512).

8. The mechanism for preventing radial displacement of the oil pump shaft according to claim 2, characterized in that, The inner rotor (3) is provided with a limiting protrusion (32) on one side of the pump body (52), and the pump body (52) is provided with a positioning recess (521) that matches the limiting protrusion (32), and the limiting protrusion (32) is inserted into the positioning recess (521).

9. The mechanism for preventing radial displacement of the oil pump shaft according to claim 1, characterized in that, The inner rotor (3) is meshed with the outer rotor (4).

10. The mechanism for preventing radial displacement of the oil pump shaft according to claim 1, characterized in that, The limiting recess or limiting protrusion is set to be circular.

Images