A gearbox rear case machining clamp

Abstract

The utility model discloses a kind of gearbox rear box body machine tooling clamps, it is characterized by: including first turnover seat, second turnover seat, clamp bottom plate, wherein first turnover seat, second turnover seat are oppositely set on same mounting base, clamp bottom plate is set on the pivot of first turnover seat, second turnover seat by adapter seat, servo drive system that first turnover seat is provided with and drives pivot rotation, the clamping surface of clamp bottom plate is provided with three positioning seats arranged in triangle, the clamping surface of clamp bottom plate middle part is provided with two interval arrangement's center positioning assembly, the side of positioning seat is all provided with first lever pressing cylinder, the pressing arm of first lever pressing cylinder is opposite the top of positioning seat.The beneficial effects of the utility model include: simple structure, clamping is convenient, multiple directions processing can be realized once clamping, avoid error produced by repeated positioning, clamping support is good, avoid local deformation produced by machine thin wall position, significantly improve processing efficiency and processing quality.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, specifically to a machining fixture for the rear housing of a gearbox. Background Technology

[0002] The rear housing of the transmission is a core load-bearing component of the automotive transmission system, requiring precise installation of bearings, gear sets, and seals. Its machining quality directly affects the rigidity, sealing performance, and NVH (noise, vibration, and harshness) of the transmission assembly. This component is typically a complex thin-walled cavity structure (mostly made of cast iron or aluminum alloy), featuring a multi-directional irregular hole system (bearing holes, locating pin holes, bolt holes), asymmetrical mounting surfaces, and high-precision geometric tolerances (e.g., hole coaxiality ≤ 0.03mm, flatness ≤ 0.05mm).

[0003] Existing machining fixtures and mechanical clamps mostly adopt sequential processing, requiring multiple clamping reference conversions. The cumulative error leads to out-of-tolerance hole position (typical problem: bearing hole misalignment causing abnormal noise). Insufficient control of clamping deformation: thin-walled areas are prone to elastic deformation under localized force from traditional spiral pressure plates or cylinders (the measured deformation can reach 0.1-0.2mm). After the stress is released during processing, springback deformation occurs, increasing the scrap rate. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this utility model provides a gearbox rear housing machining fixture, which has a simple structure, is easy to clamp, and can perform multi-directional machining in one clamping, thereby improving machining accuracy and yield.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A gearbox rear housing machining fixture, characterized in that it includes a first tilting seat, a second tilting seat, and a fixture base plate, wherein the first tilting seat and the second tilting seat are disposed opposite each other on the same mounting base, and the fixture base plate is disposed on the rotating shaft of the first tilting seat and the second tilting seat via an adapter seat. The first tilting seat is provided with a servo drive system for driving the rotating shaft to rotate. The clamping surface of the fixture base plate is provided with three positioning seats arranged in a triangle. Two spaced-apart center positioning components are provided in the middle of the clamping surface of the fixture base plate. A first lever clamping cylinder is provided on one side of each positioning seat, and the pressure arm of the first lever clamping cylinder faces the top of the positioning seat.

[0007] Furthermore, the clamping surface of the fixture base plate is provided with a plurality of floating support cylinders supporting the bottom surface of the gearbox rear housing, and a second lever pressing cylinder is provided on one side of at least two floating support cylinders corresponding to the edge of the gearbox rear housing, and the pressing arm of the second lever pressing cylinder is directly opposite to one of the adjacent floating support cylinders.

[0008] Furthermore, the center positioning assembly includes a center positioning seat disposed on the clamping surface of the fixture base plate, an axially movable push rod disposed within the center positioning seat, and a plurality of horizontally movable top pins disposed on the center positioning seat. The top pins are connected to the upper ends of the push rods via oblique dovetail grooves, such that when the push rods rise, the top pins extend outward from the center positioning seat, and when the push rods move downward, the top pins retract into the center positioning seat.

[0009] Furthermore, one of the central positioning components has three top pins evenly distributed in a ring, and the other central positioning component has two top pins symmetrically arranged.

[0010] Furthermore, the bottom surface of the fixture base plate is provided with a drive cylinder for driving the lifting and lowering of the top rod.

[0011] Furthermore, a nylon block is provided at the outer end of the top pin.

[0012] Furthermore, a cover plate is provided at the upper end of the central positioning seat, and a buffer pad is provided on the cover plate and the upper end bracket of the top rod.

[0013] Furthermore, multiple air nozzles are provided on the clamping surface of the fixture base plate.

[0014] The advantages of this utility model include: simple structure, convenient clamping, multiple directions of processing can be achieved with one clamping, avoiding errors caused by repeated positioning, good fixture support, avoiding local deformation in the machining of thin-walled areas, and significantly improving processing efficiency and processing quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the fixture base plate of this utility model;

[0017] Figure 3 This is a cross-sectional view of the central positioning component of this utility model;

[0018] Figure 4 This is a structural diagram of the present invention in its clamping state. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] One such Figure 1-4The gearbox rear housing machining fixture shown includes a first tilting seat 1, a second tilting seat 2, and a fixture base plate 3, wherein the first tilting seat 1 and the second tilting seat 2 are disposed opposite each other on the same mounting base 4. The fixture base plate 3 is mounted on the rotating shaft of the first tilting seat 1 and the second tilting seat 2 via an adapter seat 5. This structure allows the fixture base plate 3 to be tilted ±180 degrees. The first tilting seat 1 is equipped with a servo drive system that drives the rotating shaft to rotate. This servo drive system is connected to the machine tool system, thereby enabling machining of complex surfaces and multiple sides of the housing. To facilitate clamping the gearbox rear housing on the fixture base plate 3, the clamping surface of the fixture base plate 3 in this embodiment is provided with three triangularly arranged positioning seats 6. The three positioning seats 6 provide three support points, thereby positioning a plane. Two spaced-apart center positioning components 7 are provided in the center of the clamping surface of the fixture base plate 3. The two center positioning components 7 position two shaft holes on the gearbox rear housing, thereby achieving complete positioning of the gearbox rear housing. Each of the three positioning seats 6 is provided with a first lever clamping cylinder 8 on one side. The pressure arm of the first lever clamping cylinder 8 faces the top of the positioning seat 6 and is used to clamp the edge of the rear box after positioning.

[0021] To further improve the support effect of the fixture and avoid local deformation during machining, the clamping surface of the fixture base plate 3 in this embodiment is provided with multiple floating support cylinders 9 that support the bottom surface of the gearbox rear housing. At least two of the floating support cylinders 9 corresponding to the edge of the gearbox rear housing are provided with a second lever clamping cylinder 10 on one side. The pressure arm of the second lever clamping cylinder 10 is directly opposite to an adjacent floating support cylinder 9 and is used to cooperate with the floating support cylinder 9 to clamp the edge of the gearbox rear housing.

[0022] like Figure 2-3 As shown, the center positioning assembly 7 includes a center positioning seat 12 disposed on the clamping surface of the fixture base plate 3. An axially movable push rod 13 is disposed within the center positioning seat 12. Multiple horizontally movable top pins 14 are disposed on the center positioning seat 12. The top pins 14 are connected to the upper ends of the push rod 13 via oblique dovetail grooves, so that when the push rod 13 rises, the top pins 14 extend radially outward from the center positioning seat 12; when the push rod 13 moves downward, the top pins 14 retract towards the center of the center positioning seat 12. One center positioning assembly 7 has three evenly distributed top pins 14 in a ring, while the other center positioning assembly 7 has two symmetrically arranged top pins 14. The top pins 14 achieve automatic centering of the gearbox rear housing shaft hole, resulting in high positioning accuracy.

[0023] Furthermore, the bottom surface of the fixture base plate 3 is provided with a drive cylinder 15 for driving the lifting rod 13 to move up and down. The piston rod of the drive cylinder 15 is connected to the lower end of the lifting rod 13 to realize the lifting and lowering movement of the lifting rod 13.

[0024] To protect the shaft hole of the rear housing from being damaged by the top, a nylon block 16 is provided on the outer end of the top pin 14 in this embodiment, and the outer end face of the nylon block 16 is an arc spherical surface.

[0025] To ensure that the push rod 13 moves slowly at its extreme position, a cover plate 17 is provided at the upper end of the center positioning seat 12 in this embodiment, and a buffer pad 18 is provided on the upper support of the cover plate and the push rod 13.

[0026] To promptly remove chips from the fixture and prevent scratches on the housing, multiple air nozzles 19 are provided on the clamping surface of the fixture base plate 3 in this embodiment.

[0027] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A machining fixture for the rear housing of a gearbox, characterized in that: The fixture includes a first flipping seat (1), a second flipping seat (2), and a fixture base plate (3). The first flipping seat (1) and the second flipping seat (2) are arranged opposite to each other on the same mounting base (4). The fixture base plate (3) is mounted on the rotating shaft of the first flipping seat (1) and the second flipping seat (2) via an adapter (5). The first flipping seat (1) is equipped with a servo drive system that drives the rotating shaft to rotate. The clamping surface of the fixture base plate (3) is provided with three positioning seats (6) arranged in a triangle. The clamping surface of the fixture base plate (3) is provided with two spaced-apart center positioning components (7). Each of the positioning seats (6) is provided with a first lever clamping cylinder (8) on one side. The pressure arm of the first lever clamping cylinder (8) is directly above the positioning seat (6).

2. The gearbox rear housing machining fixture according to claim 1, characterized in that: The clamping surface of the fixture base plate (3) is provided with a plurality of floating support cylinders (9) supporting the bottom surface of the gearbox rear housing. At least two floating support cylinders (9) corresponding to the edge of the gearbox rear housing are provided with a second lever pressing cylinder (10) on one side. The pressing arm of the second lever pressing cylinder (10) is directly opposite to one of the adjacent floating support cylinders (9).

3. The gearbox rear housing machining fixture according to claim 1, characterized in that: The center positioning assembly (7) includes a center positioning seat (12) disposed on the clamping surface of the fixture base plate (3). An axially movable push rod (13) is disposed inside the center positioning seat (12). A plurality of horizontally movable top pins (14) are disposed on the center positioning seat (12). The top pins (14) are connected to the upper end of the push rod (13) through an oblique dovetail groove, so that when the push rod (13) rises, the top pins (14) extend outward from the center positioning seat (12), and when the push rod (13) moves downward, the top pins (14) retract into the center positioning seat (12).

4. A gearbox rear housing machining fixture according to claim 3, characterized in that: One of the central positioning components (7) has three top pins (14) evenly distributed in a ring, and the other central positioning component (7) has two top pins (14) symmetrically arranged.

5. A machining fixture for the rear housing of a gearbox according to claim 3, characterized in that: The bottom surface of the fixture base plate (3) is provided with a drive cylinder (15) for driving the top rod (13) to rise and fall.

6. A machining fixture for the rear housing of a gearbox according to claim 3, characterized in that: A nylon block (16) is provided on the outer end of the top pin (14).

7. A machining fixture for the rear housing of a gearbox according to claim 3, characterized in that: The upper end of the central positioning seat (12) is provided with a cover plate (17), and the cover plate is provided with a buffer pad (18) on the upper end support of the top rod (13).

8. A machining fixture for the rear housing of a gearbox according to claim 1, characterized in that: Multiple air nozzles (19) are provided on the clamping surface of the fixture base plate (3).

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