Differential case lock pin hole processing tool

Abstract

The utility model belongs to differential mechanism shell mechanical processing technical field especially, it relates to a differential mechanism shell lock pin hole processing frock, the device includes the clamping body, upper locating plate, lower locating plate and clamping assembly, and the top end and bottom end of clamping body are fixedly connected with upper locating plate and lower locating plate respectively, and jointly constitute the clamping cavity, the outer end of upper locating plate and lower locating plate is established with first arc locating surface and second arc locating surface respectively, and is in abutment with the differential mechanism shell both ends axle sleeve outer wall, makes full use of axle sleeve geometry datum and carries out radial positioning, the clamping assembly includes the clamping rod of through clamping body through -hole, and the both ends of clamping rod are equipped with threaded section, passes through double -end threaded structure, and operating worker only needs to tighten two nuts to finish clamping, and the device effectively solves the problem that traditional clamp clamping is complex, needs multiple clamping devices, simplifies the clamping operation, avoids the workpiece deformation due to the improper clamping sequence or clamping force, improves production efficiency and machining accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of differential housing machining technology, and in particular relates to a tooling for machining differential housing locking pin holes. Background Technology

[0002] In automotive transmission systems, the differential housing is a key transmission component. Its locking pin holes require high-precision machining. They are mainly used to fix the planetary gear shaft inside the differential, ensuring the assembly accuracy of the differential, transmission reliability, and the working stability of the entire transmission system.

[0003] Traditional differential housing locking pin hole machining fixtures are complex to set up, requiring multiple clamping devices. To ensure reliable workpiece fixation during machining, traditional fixtures usually have multiple independent clamping points. Operators need to operate each clamping device one by one, which is not only cumbersome and time-consuming, but also prone to workpiece deformation or uneven clamping due to improper clamping sequence or clamping force, further affecting machining quality and production efficiency. Utility Model Content

[0004] In view of the technical problems existing in the background art, the present invention provides a tooling for machining differential housing lock pin holes.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A differential housing locking pin hole machining fixture includes a differential housing with a slotted hole at its outer end. An upper bushing and a lower bushing are respectively provided at the top and bottom ends of the differential housing. The fixture also includes a clamping body. An upper positioning plate is fixedly connected to the top end of the clamping body, and a lower positioning plate is fixedly connected to the bottom end of the clamping body. The clamping body, the upper positioning plate, and the lower positioning plate together form a clamping cavity. A first arc-shaped positioning surface is provided at the outer end of the upper positioning plate, and the first arc-shaped positioning surface abuts against the outer wall of the upper bushing. A second arc-shaped positioning surface is provided at the outer end of the lower positioning plate, and the second arc-shaped positioning surface abuts against the outer wall of the lower bushing. A clamping assembly for clamping the differential housing is provided inside the clamping body.

[0006] Optionally, a rectangular anti-rotation groove and a countersunk groove are provided in the middle of the clamping body, and a through hole is provided on the clamping body, which passes through the center of the rectangular anti-rotation groove and the countersunk groove.

[0007] Optionally, the clamping assembly includes a clamping rod through a through hole, with a first threaded section at the end of the clamping rod away from the clamping body and a second threaded section at the end of the clamping rod near the clamping body. The outer end of the first threaded section is threadedly connected to a first fastening nut, which abuts against the outer end of the differential housing. The outer end of the second threaded section is threadedly connected to a second locking nut, which abuts against a countersunk groove.

[0008] Optionally, the clamping rod is also provided with an anti-rotation block, and a radial positioning section is provided between the anti-rotation block and the second threaded section. The anti-rotation block is embedded in the rectangular anti-rotation groove and abuts against the clamping body. The diameter of the radial positioning section matches the inner diameter of the through hole. A tool-relief hole is provided on the clamping rod.

[0009] Optionally, a guide drill sleeve is provided in the middle of both the upper and lower positioning plates. The guide drill sleeve is coaxial with the tool-relief hole, and a tool-relief groove is provided at the bottom of the lower positioning plate.

[0010] Optionally, the upper and lower bushings are each provided with a shoulder, the bottom end of the upper positioning plate abuts against the shoulder of the upper bushing, and the top end of the lower positioning plate abuts against the shoulder of the lower bushing.

[0011] This utility model has the following advantages and beneficial effects: In this invention, by setting the first arc-shaped positioning surface and the second arc-shaped positioning surface to abut against the outer walls of the upper and lower bushings respectively, the geometric reference of the differential housing bushing is fully utilized for precise radial positioning. Through the integrated clamping rod design, combined with the double-end thread structure, rapid clamping is achieved, effectively solving the problem of complex clamping and the need for multiple clamping devices in traditional fixtures. Operators only need to tighten two nuts to complete the clamping, simplifying the clamping operation and improving production efficiency. Compared with the traditional multi-point clamping method, it avoids the problems of workpiece deformation and uneven clamping caused by improper clamping sequence or clamping force, and improves the machining accuracy and surface quality of the locking pin hole. Attached Figure Description

[0012] Figure 1 This is an overall structural diagram of the tooling for machining the differential housing lock pin hole of this utility model; Figure 2 This is a structural diagram of the differential housing of this utility model; Figure 3 Partial view of the tooling for machining the differential housing locking pin hole of this utility model Figure 1 ; Figure 4 Partial view of the tooling for machining the differential housing locking pin hole of this utility model Figure 2 ; Figure 5 Partial view of the tooling for machining the differential housing locking pin hole of this utility model Figure 3 ; Figure 6 Left view of the tooling for machining the differential housing lock pin hole of this utility model; Figure 7 This utility model Figure 6 A cross-sectional view along the AA direction; Reference numerals in the attached drawings: 1. Differential housing; 101. Slotted hole; 102. Upper bushing; 103. Lower bushing; 2. Clamp body; 3. Upper positioning plate; 4. Lower positioning plate; 5. First arc-shaped positioning surface; 6. Second arc-shaped positioning surface; 7. Rectangular anti-rotation groove; 8. Countersunk groove; 9. Through hole; 10. Clamping rod; 11. First threaded section; 1101. First fastening nut; 12. Second threaded section; 1201. Second locking nut; 13. Anti-rotation block; 14. Radial positioning section; 15. Tool relief hole; 16. Guide drill sleeve; 17. Tool relief groove. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] Example like Figure 1 - Figure 2 As shown, a differential housing locking pin hole machining fixture is used to clamp the differential housing 1 for locking pin hole drilling, and includes a clamping body 2 and a clamping assembly.

[0016] The differential housing 1 has a slotted hole 101 at its outer end, and an upper bushing 102 and a lower bushing 103 are provided at the top and bottom ends respectively. The upper bushing 102 and the lower bushing 103 are respectively provided with shoulders. The fixture body 2 provides the structural foundation of the entire fixture, ensuring stable clamping and precise positioning of the workpiece during the drilling of the locking pin hole, and guaranteeing the positioning accuracy and clamping reliability during processing.

[0017] like Figure 3 - Figure 5 As shown, the top of the clamping body 2 is fixedly connected to the upper positioning plate 3, and the bottom of the clamping body 2 is fixedly connected to the lower positioning plate 4. The clamping body 2, the upper positioning plate 3, and the lower positioning plate 4 together form a clamping cavity for accommodating the differential housing 1. This integrated structural design provides a stable clamping frame. The outer end of the upper positioning plate 3 is provided with a first arc-shaped positioning surface 5, which abuts against the outer wall of the upper bushing 102. The outer end of the lower positioning plate 4 is provided with a second arc-shaped positioning surface 6, which abuts against the outer wall of the lower bushing 103.

[0018] The arc-shaped positioning surface makes full use of the geometric features of the existing bushing of the differential housing 1, using the outer circle of the bushing as the positioning reference, and achieving precise radial positioning through the cooperation of the arc surface and the cylindrical surface.

[0019] A rectangular anti-rotation groove 7 and a countersunk groove 8 are provided in the middle of the clamp body 2. A through hole 9 is provided on the clamp body 2, which passes through the center of the rectangular anti-rotation groove 7 and the countersunk groove 8.

[0020] The clamping assembly includes a clamping rod 10 through the through hole 9. The end of the clamping rod 10 away from the clamping body 2 is provided with a first threaded section 11, and the end of the clamping rod 10 near the clamping body 2 is provided with a second threaded section 12. The outer end of the first threaded section 11 is threadedly connected to a first fastening nut 1101, which abuts against the outer end of the differential housing 1. The outer end of the second threaded section 12 is threadedly connected to a second locking nut 1201, which abuts against the countersunk groove 8. The double-end threaded design allows the operator to complete the clamping by tightening only two nuts, simplifying the clamping operation.

[0021] The bidirectional threaded clamping design can apply a stable axial clamping force to the differential housing 1. The first fastening nut 1101 applies a preload to the differential housing through the slotted hole 101, and the second locking nut 1201 forms a reaction force with the clamping body to form a complete clamping structure.

[0022] The clamping rod 10 is also provided with an anti-rotation block 13. A radial positioning section 14 is provided between the anti-rotation block 13 and the second threaded section 12. The anti-rotation block 13 is embedded in the rectangular anti-rotation groove 7 and abuts against the clamping body 2. The anti-rotation block 13 has a rectangular cross section and fits precisely with the rectangular anti-rotation groove 7 to prevent the clamping rod from rotating when tightening the nut. The diameter of the radial positioning section 14 matches the inner diameter of the through hole 9, providing radial support and guidance.

[0023] The clamping rod 10 has a tool-relief hole 15, which provides a passage for the drill bit when drilling the locking pin hole. The diameter of the tool-relief hole is slightly larger than the diameter of the locking pin hole, ensuring that the drill bit can pass through smoothly without interfering with the clamping rod 10.

[0024] Both the upper positioning plate 3 and the lower positioning plate 4 are provided with guide drill sleeves 16 in the middle. The guide drill sleeves 16 are coaxially arranged with the cutter hole 15. The guide drill sleeves 16 provide guidance for the drill bit, prevent swaying and jumping during cutting, and ensure the positional accuracy and perpendicularity of the locking pin hole. The bottom end of the lower positioning plate 4 is provided with a tool relief groove 17, which provides space for the drill bit to retract, avoids interference between the drill bit and the clamp, and facilitates the removal of chips.

[0025] The upper bushing 102 and the lower bushing 103 are respectively provided with shoulders. The upper positioning plate 3 abuts against the shoulder of the upper bushing 102, and the lower positioning plate 4 abuts against the shoulder of the lower bushing 103. The shoulder positioning method can effectively prevent the differential housing 1 from moving in the axial direction. Combined with the radial positioning of the arc-shaped positioning surface, a stable positioning constraint is formed.

[0026] like Figure 1 - Figure 7 As shown, during the machining of the locking pin hole of the differential housing 1, the clamping rod 10 is first inserted into the through hole 9, so that the anti-rotation block 13 is embedded in the rectangular anti-rotation groove 7, and the radial positioning section 14 is engaged with the through hole 9. Then, the second locking nut 1201 is screwed into the second threaded section 12, so that it enters the countersunk groove 8, so that the anti-rotation block 13 is pressed against the anti-rotation groove 7, and the positioning of the tool-removing hole 15 is completed at the same time.

[0027] Next, the differential housing 1 is precisely placed in the fixture, so that the upper bushing 102 and the lower bushing 103 respectively mate with the first arc-shaped positioning surface 5 and the second arc-shaped positioning surface 6 to achieve precise radial positioning. At the same time, the shoulder contacts the end face of the positioning plate to achieve axial positioning. Meanwhile, the clamping rod 10 passes through the slotted hole 101 of the differential housing, and the first fastening nut 1101 is screwed into the first threaded section 11 so that the first fastening nut 1101 contacts the outer end face of the differential housing 1 to apply a predetermined clamping force to the differential housing 1.

[0028] After clamping, start the drilling machine or machining center. Guided by the guide drill sleeve 16, the drill bit precisely drills the locking pin hole. The guide drill sleeve 16 ensures the guiding accuracy of the drill bit, provides a channel for the drill bit in the tool hole 15, and provides space for the drill bit to retract in the tool groove 17. The machining process is stable and reliable.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tooling for machining a differential housing locking pin hole, comprising a differential housing (1), wherein a slotted hole (101) is formed at the outer end of the differential housing (1), and an upper bushing (102) and a lower bushing (103) are respectively provided at the top and bottom ends of the differential housing (1), characterized in that, It also includes a clamping body (2), the top of which is fixedly connected to an upper positioning plate (3), and the bottom of which is fixedly connected to a lower positioning plate (4). The clamping body (2), the upper positioning plate (3), and the lower positioning plate (4) together form a clamping cavity. The outer end of the upper positioning plate (3) is provided with a first arc-shaped positioning surface (5), and the first arc-shaped positioning surface (5) abuts against the outer wall of the upper bushing (102). The outer end of the lower positioning plate (4) is provided with a second arc-shaped positioning surface (6), and the second arc-shaped positioning surface (6) abuts against the outer wall of the lower bushing (103). The clamping body (2) is provided with a clamping assembly for clamping the differential housing (1).

2. The tooling for machining differential housing lock pin holes according to claim 1, characterized in that: The clamping body (2) has a rectangular anti-rotation groove (7) and a countersunk groove (8) in the middle. The clamping body (2) has a through hole (9) that passes through the clamping body (2). The through hole (9) passes through the center of the rectangular anti-rotation groove (7) and the countersunk groove (8).

3. The tooling for machining differential housing lock pin holes according to claim 2, characterized in that: The clamping assembly includes a clamping rod (10) that passes through a through hole (9). The clamping rod (10) has a first threaded section (11) at one end away from the clamping body (2) and a second threaded section (12) at one end near the clamping body (2). The outer end of the first threaded section (11) is threaded with a first fastening nut (1101), which abuts against the outer end of the differential housing (1). The outer end of the second threaded section (12) is threaded with a second locking nut (1201), which abuts against the countersunk groove (8).

4. The tooling for machining differential housing locking pin holes according to claim 3, characterized in that: The clamping rod (10) is also provided with an anti-rotation block (13). A radial positioning section (14) is provided between the anti-rotation block (13) and the second threaded section (12). The anti-rotation block (13) is embedded in the rectangular anti-rotation groove (7) and abuts against the clamping body (2). The diameter of the radial positioning section (14) matches the inner diameter of the through hole (9). A tool-relief hole (15) is provided on the clamping rod (10).

5. The tooling for machining differential housing lock pin holes according to claim 1, characterized in that: The upper positioning plate (3) and the lower positioning plate (4) are both provided with guide drill sleeves (16) in the middle. The guide drill sleeves (16) are coaxial with the cutter hole (15). The bottom end of the lower positioning plate (4) is provided with a cutter groove (17).

6. The tooling for machining differential housing lock pin holes according to claim 2, characterized in that: The upper bushing (102) and the lower bushing (103) are respectively provided with shoulders. The bottom end of the upper positioning plate (3) abuts against the shoulder of the upper bushing (102), and the top end of the lower positioning plate (4) abuts against the shoulder of the lower bushing (103).

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