Automobile pump shell processing clamp

By designing a multi-faceted clamping mechanism suitable for automotive pump housings, the problem of existing fixtures being unable to clamp from multiple sides was solved, achieving efficient and low-cost pump housing processing, and improving ease of operation and precision.

CN224322756UActive Publication Date: 2026-06-05WUHAN HONGBOXIN PRECISION MACHINERY IND & TRADE CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WUHAN HONGBOXIN PRECISION MACHINERY IND & TRADE CO LTD
Filing Date
2025-07-21
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing automotive pump housing machining fixtures cannot clamp different sides of the pump housing, resulting in the need to change fixtures multiple times, increasing costs and operational complexity, and reducing work efficiency.

Method used

A machining fixture for automotive pump housings is designed, comprising a first clamping mechanism and a second clamping mechanism, which are respectively used to clamp different sides of the pump housing. Through the combination of support and clamping components, multi-faceted machining of the pump housing can be achieved. The clamping mechanism is equipped with a driver to adapt to different sizes.

Benefits of technology

This technology enables multi-faceted machining of multiple pump casings during a single loading and unloading process, eliminating the need for multiple fixture changes, reducing costs and operational complexity, and improving work efficiency and machining accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of automobile pump shell machining fixture, it is related to machining equipment technical field, automobile pump shell machining fixture includes clamping seat, first clamping mechanism and second clamping mechanism, first clamping mechanism includes first mounting seat, first mounting seat is provided with first support and first clamping piece, first support and first clamping piece are respectively clamped fixed two first side face;Second clamping mechanism includes second mounting seat, second mounting seat is provided with second support and second clamping piece, second support and second clamping piece are respectively clamped fixed two second side face.Different side face clamping is carried out to pump shell, realize that pump shell can be carried out machining operation on all faces on clamping seat, when different face of pump shell is processed, fixture does not need to be replaced for several times, reduce cost and the complexity of operation, and in single feeding and discharging process, multiple pump shells can be machined, improve work efficiency.
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Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a machining fixture for automotive pump housings. Background Technology

[0002] The pump housing of an anti-lock braking system (ABS) is one of the core components of an automotive braking system. Its main function is to provide stable hydraulic power to the ABS, ensuring that the wheels do not lock up completely during emergency braking. This allows the driver to maintain control of the vehicle, effectively shortens the braking distance, and improves driving safety.

[0003] The pump housing has a complex structure and requires machining on multiple surfaces to ensure the precision and functionality of each part. However, as disclosed in patent CN108907795A, a universal fixture for machining automotive pump housings is used. The fixing pin is rotated and removed, and then the upper clamping block is moved upwards to conform to the dimensions of the automotive pump housing. After adjustment, the fixing pin is inserted and rotated so that the right end of the fixing pin passes through the pin hole. The automotive pump housing is then placed between the fixed fixture and the movable fixture. Turning the crank causes the screw to push the slider, with the pulley assisting in the movement, causing the movable fixture to move to the left, clamping both ends of the automotive pump housing into the clamping grooves, completing the clamping process and allowing for subsequent machining.

[0004] This fixture can only be clamped and processed on one side, and cannot clamp the pump casing on different sides. When processing different sides of the pump casing, the fixture needs to be changed multiple times, which increases costs, increases the complexity of operation, and reduces work efficiency. Utility Model Content

[0005] In view of this, the present invention proposes an automotive pump housing processing fixture, which can solve the problem that existing fixtures cannot clamp pump housings on different sides, resulting in the need to change fixtures multiple times during pump housing processing, leading to high processing costs and low efficiency.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a machining fixture for automotive pump housings, used to clamp and fix pump housings. The pump housing includes a top surface and a bottom surface arranged opposite to each other, and the top surface and the bottom surface are connected by multiple side surfaces. Each side surface includes a first side surface and a second side surface arranged opposite to each other. The machining fixture includes:

[0008] The clamping base has a first machining side and a second machining side that are spaced apart.

[0009] A first clamping mechanism includes a first mounting base disposed on the first processing side, a first support member and a first clamping member disposed opposite to each other on the first mounting base, the first clamping member being movably disposed on the first mounting base, and the first support member and the first clamping member respectively clamping and fixing the two first side surfaces; and

[0010] The second clamping mechanism includes a second mounting base disposed on the second processing side. The second mounting base is provided with a second support member and a second clamping member disposed opposite to each other. The second clamping member is movably disposed on the second mounting base. The second support member and the second clamping member respectively clamp and fix the two second side surfaces.

[0011] Based on the above technical solutions, preferably, the clamping base includes a base and a stand disposed on the base, the stand having multiple processing sides on its periphery, the first processing side and the second processing side being located on different processing sides respectively.

[0012] More preferably, each of the processing sides includes two first processing surfaces arranged opposite to each other and two second processing surfaces arranged opposite to each other. Each of the first processing surfaces is provided with a first clamping mechanism, and each of the second processing surfaces is provided with a second clamping mechanism.

[0013] More preferably, a spaced side is formed between adjacent first and second processed surfaces.

[0014] Based on the above technical solutions, preferably, the first mounting base is provided with a first clamping base and a first support base at intervals, the first clamping base is disposed above the first support base, the first support member is disposed on the first clamping base, the first clamping member is disposed on the side of the first clamping base facing the first support base, and the first clamping base is provided with a first driver, the first driver being used to drive the lifting and lowering of the first clamping member.

[0015] More preferably, the second mounting base is provided with a second clamping seat and a second support seat at an interval between the upper and lower parts. The second clamping seat is located above the second support seat, the second support member is located on the second clamping seat, and the second clamping member is located on the side of the second clamping seat facing the second support seat. The second clamping seat is provided with a second driver, which is used to drive the second clamping member to rise and fall.

[0016] More preferably, two flow channel holes are spaced apart on the second side, and the second support member includes two spaced support columns, each of which is used to insert into the corresponding flow channel holes on the second side.

[0017] The second clamping member includes two spaced-apart positioning posts, each of which is used to engage with two flow channel holes on the corresponding second side.

[0018] More preferably, the cross-sectional shape of the flow channel hole is circular, the cross-sectional shape of one of the support columns and the cross-sectional shape of one of the positioning columns are both straight, and the cross-sectional shape of the other support column and the other positioning column are both triangular.

[0019] Based on the above technical solution, preferably, the second support base is provided with two auxiliary support members, which are located on the side of the two support columns that are far apart from each other, and the auxiliary support members are used to cooperate with the corresponding second side.

[0020] Based on the above technical solution, preferably, it also includes multiple sets of support mechanisms, each of which supports the first support base and the second support base respectively. Each support mechanism includes at least two spaced-apart connectors, the bottom end of which is disposed on the base, and the other end of which passes through the first support base or the second support base. A support block is movably disposed on the connector, and the support block contacts and engages with the bottom of the first support base or the second support base.

[0021] The automotive pump housing machining fixture of this invention has the following advantages over the prior art:

[0022] (1) The two first sides of the pump housing are clamped and fixed by the first support and the first clamping member respectively, and the two second sides are clamped and fixed by the second support and the second clamping member respectively. By clamping the pump housing on different sides, the pump housing can be processed on all surfaces on the clamping base. When processing different surfaces of the pump housing, it is not necessary to change the fixture multiple times, which reduces the cost and the complexity of operation. In addition, multiple pump housings can be processed in a single loading and unloading process, which improves work efficiency.

[0023] (2) By alternately setting the first clamping mechanism and the second clamping mechanism in the circumference of the stand, after the pump casing completes one processing operation, the posture of the pump casing can be adjusted and then clamped and fixed on the adjacent processing side, which is convenient for the operator. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of the automotive pump housing processing fixture of this utility model;

[0026] Figure 2 This is a perspective view of the pump housing in the automotive pump housing processing fixture of this utility model;

[0027] Figure 3 This is a perspective view of the pump housing from another direction in the automotive pump housing processing fixture of this utility model;

[0028] Figure 4 This is a schematic diagram of the clamping seat in the automotive pump housing machining fixture of this utility model;

[0029] Figure 5 This is a schematic diagram of the first clamping mechanism in the automotive pump housing processing fixture of this utility model;

[0030] Figure 6 This is an exploded view of the first clamping mechanism in the automotive pump housing machining fixture of this utility model;

[0031] Figure 7 This is a schematic diagram of the second clamping mechanism in the automotive pump housing processing fixture of this utility model;

[0032] Figure 8 This is an exploded view of the second clamping mechanism in the automotive pump housing machining fixture of this utility model;

[0033] Figure 9 This is a schematic diagram illustrating the structure of the second support member in the automotive pump housing machining fixture of this utility model.

[0034] Figure label:

[0035] 1. Pump casing; 11. Top surface; 12. Bottom surface; 13. Side surface; 131. First side surface; 132. Second side surface; 14. Flow channel hole; 2. Clamping seat; 21. Base; 22. Stand; 23. Machining side; 231. First machining surface; 232. Second machining surface; 24. First machining side; 25. Second machining side; 26. Spacer side; 3. First clamping mechanism; 31. First mounting seat; 32. First support member; 33. First clamping member; 34. First clamping seat; 35. First support seat; 36. First driver; 4. Second clamping mechanism; 41. Second mounting seat; 42. Second support member; 421. Support column; 422. Auxiliary support member; 43. Second clamping member; 431. Positioning column; 44. Second clamping seat; 45. Second support seat; 46. Second driver; 5. Support mechanism; 51. Connector; 52. Support block. Detailed Implementation

[0036] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] like Figures 1 to 9 As shown, this utility model provides an automotive pump housing processing fixture for clamping and fixing a pump housing 1. The pump housing 1 includes a top surface 11 and a bottom surface 12 arranged opposite to each other, and a plurality of side surfaces 13 are connected between the top surface 11 and the bottom surface 12. Each side surface 13 includes a first side surface 131 and a second side surface 132 arranged opposite to each other. The processing fixture includes a clamping base 2, a first clamping mechanism 3, and a second clamping mechanism 4. The clamping base 2 has a first processing side 24 and a second processing side 25 arranged at intervals. The first clamping mechanism 3 includes a first mounting base 31 disposed on the first processing side 24. The mounting base 31 is provided with a first support member 32 and a first clamping member 33 arranged opposite to each other. The first clamping member 33 is movably disposed on the first mounting base 31. The first support member 32 and the first clamping member 33 respectively clamp and fix the two first side surfaces 131. The second clamping mechanism 4 includes a second mounting base 41 disposed on the second processing side 25. The second mounting base 41 is provided with a second support member 42 and a second clamping member 43 arranged opposite to each other. The second clamping member 43 is movably disposed on the second mounting base 41. The second support member 42 and the second clamping member 43 respectively clamp and fix the two second side surfaces 132.

[0038] The pump housing 1 is fixed to the first processing side 24 of the clamping base 2 by clamping the two first side surfaces 131 of the pump housing 1 with the first support member 32 and the first clamping member 33 respectively. The second side surface 132, top surface 11 or bottom surface 12 of the pump housing 1 can be processed by processing equipment. The pump housing 1 is fixed to the second processing side 25 of the clamping base 2 by clamping the two second side surfaces 132 of the pump housing 1 with the second support member 42 and the second clamping member 43 respectively. The first side surface 131, top surface 11 or bottom surface 12 of the pump housing 1 can be processed by processing equipment. By clamping the pump housing 1 with different side surfaces 13, multiple pump housings 1 can be processed in a single loading and unloading process. When processing different surfaces of the pump housing 1, it is not necessary to change the fixture multiple times, which reduces the cost and complexity of operation and improves the work efficiency.

[0039] In some embodiments, the clamping base 2 includes a base 21 and a stand 22 disposed on the base 21. The stand 22 has a plurality of machining sides 23 on its periphery, and the first machining side 24 and the second machining side 25 are respectively located on different machining sides 23. The fact that the first machining side 24 and the second machining side 25 are respectively located on different machining sides 23 can separate the first clamping mechanism 3 and the second clamping mechanism 4, ensuring the reliability of the machining process and avoiding interference.

[0040] To further improve work efficiency, when the pump casing 1 is located on the first processing side 24, its bottom surface 12 faces the first mounting base 31, and its two first side surfaces 131 are used for clamping and fixing. Therefore, the processing equipment on the first processing side 24 can perform processing operations on the top surface 11 and the second side surfaces 132 of the pump casing 1. When the pump casing 1 is located on the second processing side 25, its top surface 11 faces the second mounting base 41, and its two second side surfaces 132 are used for clamping and fixing. Therefore, the processing equipment on the second processing side 25 can perform processing operations on the bottom surface 12 and the first side surfaces 131 of the pump casing 1. Thus, the processing of each surface of the pump casing 1 can be completed through the first clamping mechanism 3 and the second clamping mechanism 4.

[0041] In some embodiments, each of the processing sides 23 includes two first processing surfaces 231 and two second processing surfaces 232 arranged opposite to each other. Each first processing surface 231 is provided with a first clamping mechanism 3, and each second processing surface 232 is provided with a second clamping mechanism 4. The presence of two first clamping mechanisms 3 and two second clamping mechanisms 4 allows the fixture to simultaneously clamp and fix multiple pump housings 1 and perform processing, improving processing efficiency. Furthermore, by alternately arranging the first clamping mechanisms 3 and second clamping mechanisms 4 circumferentially on the stand 22, after each processing operation of a pump housing 1, its posture can be adjusted before clamping and fixing it onto an adjacent processing side 23, facilitating operator operation.

[0042] like Figures 1 to 9 As shown, in some embodiments, a spacer side 26 is formed between adjacent first processing surface 231 and second processing surface 232. The spacer side 26 creates a certain spatial distance between the first processing surface 231 and the second processing surface 232, which serves as an isolation mechanism. When vibrations or impacts generated during processing are transmitted from the first processing surface 231, the spacer side 26 will prevent these forces from directly acting on the second processing surface 232, thereby effectively reducing the impact on the processing accuracy of the second processing surface 232, and vice versa.

[0043] In some embodiments, the first mounting base 31 is provided with a first clamping base 34 and a first support base 35 spaced vertically apart. The first clamping base 34 is disposed above the first support base 35, the first support member 32 is disposed on the first clamping base 34, and the first clamping member 33 is disposed on the side of the first clamping base 34 facing the first support base 35. The first clamping base 34 is provided with a first driver 36, which is used to drive the lifting and lowering of the first clamping member 33. By driving the lifting and lowering of the first clamping member 33 through the first driver 36, the distance between the first clamping member 33 and the first support member 32 can be adjusted, so that the first clamping member 33 can be flexibly adjusted according to the size of the pump housing 1, thereby improving the adaptability and versatility of the clamp.

[0044] The first driver 36 includes a cylinder, a hydraulic cylinder, or an electric push rod, which is used to drive the reciprocating movement of the first clamping member 33 through connection with the first clamping member 33.

[0045] In some embodiments, the second mounting base 41 is provided with a second clamping base 44 and a second support base 45 spaced vertically apart. The second clamping base 44 is disposed above the second support base 45, the second support member 42 is disposed on the second clamping base 44, and the second clamping member 43 is disposed on the side of the second clamping base 44 facing the second support base 45. The second clamping base 44 is provided with a second driver 46, which is used to drive the lifting and lowering of the second clamping member 43. By driving the lifting and lowering of the second clamping member 43 through the second driver 46, the distance between the second clamping member 43 and the second support member 42 is adjusted, so that the second clamping member 43 can be flexibly adjusted according to the size of the pump housing 1, thereby improving the adaptability and versatility of the clamp.

[0046] The second driver 46 includes a cylinder, a hydraulic cylinder, or an electric push rod, which is used to drive the reciprocating movement of the second clamping member 43 through connection with the second clamping member 43.

[0047] like Figures 1 to 9 As shown, in some embodiments, two flow channel holes 14 are spaced apart on the second side surface 132. The second support member 42 includes two spaced-apart support columns 421, which are respectively used to insert and cooperate with the two flow channel holes 14 of the corresponding second side surface 132. The second clamping member 43 includes two spaced-apart positioning columns 431, which are respectively used to insert and cooperate with the two flow channel holes 14 of the corresponding second side surface 132. By using the flow channel holes 14 on the pump housing 1 as positioning and support points for the clamp, the support columns 421 and positioning columns 431 can accurately cooperate with the pump housing 1, improving the positioning accuracy of the clamp and the pump housing 1 and reducing machining errors.

[0048] In some embodiments, the cross-sectional shape of the flow channel hole 14 is circular, wherein the cross-sectional shape of one of the support columns 421 and one of the positioning columns 431 is straight, and the cross-sectional shape of the other support column 421 and the other positioning column 431 is triangular. The straight-section support column 421 ensures line contact with the flow channel hole 14, improving positioning accuracy. Due to the smaller contact area, the support column 421 can be inserted more precisely into the flow channel hole 14, reducing positional deviation. The triangular cross-section support column 421 provides three-point contact with the flow channel hole 14, resulting in a relatively larger contact area and providing stable support. This ensures the stable insertion of the support column 421 within the flow channel hole 14, reducing vibration and displacement caused by unstable support.

[0049] In some embodiments, the second support base 45 is provided with two auxiliary support members 422, which are located on opposite sides of the two support columns 421. The auxiliary support members 422 are used to cooperate with the corresponding second side surface 132. The auxiliary support members 422 further enhance the support effect of the clamp on the pump housing 1, disperse the clamping force, and avoid excessive local pressure that could cause deformation of the pump housing 1.

[0050] In some embodiments, the automotive pump housing machining fixture further includes multiple sets of support mechanisms 5, each of which supports the first support base 35 and the second support base 45 respectively. Each support mechanism 5 includes at least two spaced-apart connectors 51, the bottom end of which is disposed on the base 21, and the other end of which passes through the first support base 35 or the second support base 45. A support block 52 is movably disposed on the connector 51, and the support block 52 contacts and engages with the bottom of the first support base 35 or the second support base 45. The design of the support mechanism 5 effectively enhances the structural stability of the clamping base 2, ensuring that the clamping base 2 will not shake or deform during machining, thereby providing a more stable support environment for the machining of the pump housing 1 and further improving machining accuracy. Furthermore, by adjusting the height of the two support blocks 52, the levelness of the first support base 35 and the second support base 45 can be adjusted, thereby ensuring the accuracy of the position of the pump housing 1 located thereon and improving machining accuracy.

[0051] The support block 52 can be threaded onto the connector 51; or the support block 52 can be slidably disposed on the connector 51 and fixed to the connector 51 by means of a locating pin or screw. In this embodiment, the support block 52 is threaded onto the connector 51, and the height of the support block 52 can be adjusted by rotating the support block 52, thereby adjusting the levelness of the first support seat 35 or the second support seat 45 located thereon.

[0052] like Figures 1 to 9As shown above, the automotive pump housing processing fixture provided in this application clamps and fixes the two first side surfaces 131 of the pump housing 1 using the first support member 32 and the first clamping member 33, thereby fixing the pump housing 1 to the first processing side 24 of the clamping base 2. The second side surface 132, top surface 11, or bottom surface 12 of the pump housing 1 can be processed using processing equipment. Similarly, the second support member 42 and the second clamping member 43 clamp and fix the two second side surfaces 132, thereby fixing the pump housing 1 to the second processing side 25 of the clamping base 2. The first side surface 131, top surface 11, or bottom surface 12 of the pump housing 1 can be processed using processing equipment. By clamping the pump housing 1 with different side surfaces 13, multiple pump housings 1 can be processed in a single loading and unloading process. When processing different surfaces of the pump housing 1, it is not necessary to change the fixture multiple times, reducing costs and operational complexity, and improving work efficiency.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A jig for machining automotive pump housings, characterized in that, For clamping and fixing a pump housing (1), the pump housing (1) includes a top surface (11) and a bottom surface (12) arranged opposite to each other, and the top surface (11) and the bottom surface (12) are connected by a plurality of side surfaces (13), each of the side surfaces (13) including a first side surface (131) arranged opposite to each other and a second side surface (132) arranged opposite to each other, the machining fixture includes: The clamping base (2) has a first machining side (24) and a second machining side (25) spaced apart. The first clamping mechanism (3) includes a first mounting base (31) disposed on the first processing side (24). The first mounting base (31) is provided with a first support member (32) and a first clamping member (33) disposed opposite to each other. The first clamping member (33) is movably disposed on the first mounting base (31). The first support member (32) and the first clamping member (33) respectively clamp and fix the two first side surfaces (131). The second clamping mechanism (4) includes a second mounting base (41) disposed on the second processing side (25). The second mounting base (41) is provided with a second support member (42) and a second clamping member (43) disposed opposite to each other. The second clamping member (43) is movably disposed on the second mounting base (41). The second support member (42) and the second clamping member (43) respectively clamp and fix the two second side surfaces (132).

2. The automotive pump housing machining fixture as described in claim 1, characterized in that: The clamping base (2) includes a base (21) and a stand (22) disposed on the base (21). The stand (22) has multiple processing sides (23) around its periphery. The first processing side (24) and the second processing side (25) are respectively located on different processing sides (23).

3. The automotive pump housing machining fixture as described in claim 2, characterized in that: Each of the processing sides (23) includes two first processing surfaces (231) arranged opposite to each other and two second processing surfaces (232) arranged opposite to each other. Each of the first processing surfaces (231) is provided with a first clamping mechanism (3), and each of the second processing surfaces (232) is provided with a second clamping mechanism (4).

4. The automotive pump housing machining fixture as described in claim 3, characterized in that: A spacer side (26) is formed between adjacent first processing surface (231) and second processing surface (232).

5. The automotive pump housing machining fixture as described in claim 2, characterized in that: The first mounting base (31) is provided with a first clamping base (34) and a first support base (35) spaced vertically. The first clamping base (34) is located above the first support base (35). The first support member (32) is located on the first clamping base (34). The first clamping member (33) is located on the side of the first clamping base (34) facing the first support base (35). The first clamping base (34) is provided with a first driver (36), which is used to drive the first clamping member (33) to rise and fall.

6. The automotive pump housing machining fixture as described in claim 5, characterized in that: The second mounting base (41) is provided with a second clamping base (44) and a second support base (45) spaced vertically. The second clamping base (44) is located above the second support base (45). The second support member (42) is located on the second clamping base (44). The second clamping member (43) is located on the side of the second clamping base (44) facing the second support base (45). The second clamping base (44) is provided with a second driver (46), which is used to drive the second clamping member (43) to rise and fall.

7. The automotive pump housing machining fixture as described in claim 6, characterized in that: Two flow channel holes (14) are provided at intervals on the second side surface (132), and the second support member (42) includes two support columns (421) arranged at intervals. The two support columns (421) are respectively used to insert and cooperate with the two flow channel holes (14) of the corresponding second side surface (132); The second clamping member (43) includes two spaced positioning posts (431), which are respectively used to engage with the two flow channel holes (14) of the corresponding second side (132).

8. The automotive pump housing machining fixture as described in claim 7, characterized in that: The cross-sectional shape of the flow channel hole (14) is circular, the cross-sectional shape of one of the support columns (421) and the cross-sectional shape of one of the positioning columns (431) are both straight, and the cross-sectional shape of the other support column (421) and the cross-sectional shape of the other positioning column (431) are both triangular.

9. The automotive pump housing machining fixture as described in claim 7, characterized in that: The second support base (45) is provided with two auxiliary support members (422). The two auxiliary support members (422) are located on the side of the two support columns (421) that are far apart from each other. The auxiliary support members (422) are used to cooperate with the corresponding second side surface (132).

10. The automotive pump housing machining fixture as described in claim 6, characterized in that: It also includes multiple sets of support mechanisms (5), each of which supports the first support base (35) and the second support base (45) respectively. Each support mechanism (5) includes at least two spaced connectors (51). The bottom end of each connector (51) is disposed on the base (21), and the other end of each connector (51) passes through the first support base (35) or the second support base (45). A support block (52) is movably disposed on each connector (51), and the support block (52) contacts and cooperates with the bottom of the first support base (35) or the second support base (45).