Positioning clamp special for shifting fork machining

Abstract

The utility model belongs to the field of shifting fork machining, and provides a special positioning clamp for shifting fork machining, which comprises a carrying table, and a group of positioning machining clamps and a group of positioning chamfering clamps are respectively arranged on the carrying table. The positioning machining clamp comprises an inclined pulling base assembly, a pair of front supporting bases and a rear supporting base which are sequentially arranged from front to back, the left side, the right side and the front side of the inclined pulling base assembly are each provided with a pair of auxiliary supporting oil cylinders, and driving shafts of the auxiliary supporting oil cylinders are provided with auxiliary supporting top heads. A front clamping mechanism and a rear clamping mechanism are arranged on the carrying table and face the front supporting base and the rear supporting base respectively, the inclined pulling base assembly comprises a base, a sliding groove is formed in the base, and a pair of wedge blocks are arranged in the sliding groove in a sliding mode. The utility model aims to provide a positioning clamp special for shifting fork machining, and aims to solve the problem that a shifting fork is easy to deform in the machining process due to the fact that an existing positioning clamp special for shifting fork machining cannot well support the shifting fork and limit and clamp the shifting fork.

Description

Technical Field

[0001] The utility model belongs to the field of shift fork processing, in particular to a special positioning fixture for shift fork processing. Background Art

[0002] The shift fork is a key component in the transmission mechanism of a car or machine tool. It's connected to the shift handle and located at the bottom of the handle. By moving the shift wheel or gear in the middle, the shift fork changes the ratio of input to output speed, thereby achieving different speed ranges for equipment such as cars and machine tools.

[0003] Prior to machining, shift forks are typically clamped and positioned using a fork machining fixture. However, existing fork machining fixtures struggle to effectively and fully support the fork, causing it to deform during machining. Furthermore, they also struggle to properly clamp the fork, impacting machining quality. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to provide a special positioning fixture for processing shift forks, aiming to solve the problem that the existing special positioning fixture for processing shift forks cannot support well and limit the clamping of the shift forks, causing the shift forks to be easily deformed during the processing.

[0005] The utility model adopts the following technical solutions:

[0006] The special positioning fixture for fork processing includes a carrier, and a group of positioning processing fixtures and a group of positioning chamfering fixtures are respectively provided on the carrier. The positioning processing fixture includes an inclined pull seat assembly, a pair of front support seats, and a rear support seat, which are arranged in sequence from front to back. A pair of auxiliary support oil cylinders are respectively provided on the left and right sides and the front side of the inclined pull seat assembly. The driving shaft of the auxiliary support oil cylinder is provided with an auxiliary support head. Front and rear clamping mechanisms are respectively provided on the carrier facing the front support seat and the rear support seat. The inclined pull seat assembly includes a base, a slide groove is opened in the base, and a pair of wedge blocks are slidably provided in the slide groove. Clamps are provided on the outer side of the wedge blocks, and a centering pressure head is provided inwardly of the clamping jaws. A driving assembly for driving the two clamping jaws to move synchronously is provided on the carrier.

[0007] Furthermore, an upward and inward inclined groove is opened on the inner side of the wedge block, and a lifting sleeve is inserted into the slide groove between the two wedge blocks. T-shaped inclined pull blocks are formed on both sides of the top of the lifting sleeve, and the two sides of the inclined pull blocks are respectively embedded and installed in the corresponding inclined grooves. The driving assembly includes a pushing cylinder installed at the bottom of the carrier, and the driving shaft of the pushing cylinder is provided with a lifting rod, which is inserted into the lifting sleeve, and a spring is provided on the lifting rod located in the lifting sleeve.

[0008] Furthermore, the rear support seat includes a limit seat, a avoidance opening is opened on the front side of the limit seat, a pad is provided in the avoidance opening, a top column is formed on the pad, a V-shaped opening is opened above the front side of the limit seat, and a pair of trapezoidal limit strips are formed on the inner wall of the V-shaped opening.

[0009] Furthermore, a side support oil cylinder is provided on the outer side of the rear support seat, and a side support head is connected to the driving shaft of the side support oil cylinder.

[0010] Furthermore, the front clamping mechanism and the rear clamping mechanism both include a clamping cylinder, wherein a connecting seat is rotatably provided on the front clamping cylinder, a front clamping block is rotatably provided in the connecting seat, the driving shaft of the front clamping cylinder is rotatably connected to the tail of the front clamping block, and a rear clamping block is provided on the driving shaft of the rear clamping cylinder, and both the front and rear clamping blocks are provided with clamping columns.

[0011] Furthermore, the positioning chamfering fixture includes support blocks and positioning pins arranged in front and back, a support platform is provided on the front side of the support block, a support protrusion is formed on the support block, and a pair of front and rear fixed cylinders are provided on the carrier facing the support block and the positioning pin respectively, the driving shaft of the front fixed cylinder is provided with a lifting block, the lifting block is provided with a triangular pressing block, and the driving shaft of the rear fixed cylinder is provided with a support rod.

[0012] Furthermore, a pair of limit blocks are provided on the support platform.

[0013] Furthermore, there are four corners of the platform above the

[0014] The beneficial effects of the present invention are as follows: two types of fixtures are provided on the carrier: a positioning fixture and a positioning chamfering fixture, each suitable for different machining positions of the shift fork. This shift fork machining positioning fixture not only effectively and comprehensively supports the shift fork, thereby preventing deformation during machining, but also provides limited clamping of the shift fork, thereby improving machining stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the shift fork structure provided by the utility model.

[0016] Figure 2 This is a top view of a special positioning fixture for machining shift forks provided by the utility model.

[0017] Figure 3 This is a schematic diagram of a positioning processing fixture provided by the utility model.

[0018] Figure 4 This is a schematic diagram of the layout of the side support cylinders provided by the utility model.

[0019] Figure 5This utility model provides a schematic diagram of the interior of the base.

[0020] Figure 6 This is a cross-sectional view of the drive assembly provided by the present invention.

[0021] Figure 7 This is a structural diagram of a positioning chamfering fixture provided by the utility model.

[0022] Figure 8 This is a structural diagram of the rear support seat provided by the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not intended to limit the utility model.

[0024] In order to illustrate the technical solution of the present invention, specific embodiments are provided below.

[0025] For the sake of convenience, only the parts related to the embodiments of the present invention are shown.

[0026] Combine Figure 2-6 As shown, the special positioning fixture for fork processing includes a carrier 1, and a group of positioning processing fixtures and a group of positioning chamfering fixtures are respectively provided on the carrier 1. The positioning processing fixture includes a diagonal pull seat assembly 2, a pair of front support seats 3, and a rear support seat 4, which are arranged in sequence from front to back. A pair of auxiliary support cylinders 5 are respectively provided on the left and right sides and the front side of the diagonal pull seat assembly 2. The driving shaft of the auxiliary support cylinder 5 is provided with an auxiliary support head 6. Front and rear clamping mechanisms are respectively provided on the carrier 1 facing the front support seat 3 and the rear support seat 4. The diagonal pull seat assembly 2 includes a base 2.1, a slide groove 2.2 is opened in the base 2.1, and a pair of wedge blocks 2.3 are slidingly provided in the slide groove 2.2. The outer side of the wedge block 2.3 is provided with a clamping claw 2.4, and the clamping claw 2.4 is provided with a centering pressure head 2.5 facing inward. The carrier 1 is provided with a driving assembly for driving the two clamping claws 2.4 to move synchronously.

[0027] The shift fork is a key component in the transmission of a car or a machine tool. It is connected to the speed change handle and is located at the lower end of the handle. By turning the middle speed change wheel or gear, the shift fork can change the speed ratio between input and output, thereby achieving different speed ranges for equipment (such as cars, machine tools, etc.). Figure 1 As shown in the figure, the front end of the fork 20 is an arc-shaped fork structure, and the rear end is formed with a pair of upper and lower ear seats 201, the ear seats are provided with mounting holes S4, and the side wall of the rear end is formed with a short shaft 203, and the short shaft 203 is provided with an axis hole S5.

[0028] During the production and processing of shift forks, a positioning fixture is often used to position and clamp the shift forks, which can facilitate further processing of the shift forks. In this embodiment, a pair of positioning processing fixtures and a pair of positioning chamfering fixtures are respectively provided on the carrier. In this way, the positioning fixture dedicated to shift fork processing can position and clamp four shift forks at a time, greatly improving the subsequent processing efficiency. When the positioning processing fixture is used to position and clamp the shift forks, Figure 1 The shift fork shown in the figure is processed at positions S1-S5. When the shift fork is positioned and clamped using a positioning chamfering fixture, the shaft hole and mounting hole, i.e., positions S6 and S7, can be chamfered.

[0029] When using a positioning processing fixture to position and clamp the shift fork to be processed, first place the shift fork into the positioning processing fixture as required, with the upper surface of the shift fork facing upward. At this time, the front support seat and the rear support seat respectively support the front and rear positions of the shift fork. First, the inclined seat assembly limits and supports the front ends of the shift fork. The front and rear clamping mechanisms then clamp the corresponding positions of the front and rear ends of the shift fork respectively. Then all the auxiliary support cylinders drive the corresponding auxiliary support heads toward the shift fork until the auxiliary support heads support the shift fork. At this time, the left and right sides and the front and rear ends of the shift fork are in a compressed and supported state. Finally, the positions S1-S5 on the upper surface of the shift fork can be processed. After the upper surface of the shift fork is processed, the shift fork can be adjusted so that the lower surface of the shift fork faces upward. The positioning processing fixture clamps the shift fork again, and the positions S1-S4 on the lower surface can be processed.

[0030] As a preferred structure, Figure 5-6 The inner side of the wedge block 2.3 is provided with an upward and inward inclined groove 7. A lifting sleeve 8 is inserted into the slide groove 2.2 between the two wedge blocks 2.3. The top surface of the lifting sleeve 8 is provided with a top cover 9. T-shaped inclined pull blocks 10 are formed on both sides of the top of the lifting sleeve 8. The two sides of the inclined pull blocks 10 are respectively embedded and installed in the corresponding inclined grooves 7. The driving assembly includes a push cylinder 11 installed at the bottom of the carrier 1. The driving shaft of the push cylinder 11 is provided with a lifting rod 12. In the figure, the end of the lifting rod 12 is screwed into the driving shaft of the push cylinder 11. The lifting rod 12 penetrates into the lifting sleeve 8. A spring 14 is provided on the lifting rod 12 located in the lifting sleeve 8. In the figure, the top of the lifting rod 12 is a screw head 13.

[0031] In the diagram, the spring is compressed, and the bottom of the lifting sleeve contacts the drive shaft. As the drive shaft moves downward, the spring forces the lifting sleeve downward in tandem. Through the forces of the inclined slot 7 and the diagonal pull block 10, the wedge 2.3 moves inward, and the two clamping jaws 2.4 move inward synchronously to clamp the shift fork. Similarly, as the drive shaft moves upward, the two clamping jaws 2.4 open synchronously. If the shift fork has a slight size error, such as being too large, the lifting sleeve will float slightly after the drive shaft moves downward, leaving a small gap between the lifting sleeve and the top of the drive shaft, allowing the clamping jaws to still clamp the shift fork.

[0032] like Figure 3-4 The front clamping mechanism and the rear clamping mechanism both include clamping cylinders, with the front clamping cylinder being designated 151 and the rear clamping cylinder being designated 152. A connecting seat 16 is rotatably mounted on the front clamping cylinder 151, and a front pressing block 17 is rotatably mounted within the connecting seat 16. The drive shaft of the front clamping cylinder 151 is rotatably connected to the tail of the front pressing block 17. A rear pressing block 18 is mounted on the drive shaft of the rear clamping cylinder 152, and both the front and rear pressing blocks 17 and 18 are provided with pressing posts 19.

[0033] like Figure 1 In the example, shallow grooves 205 are formed on the front and upper and lower surfaces of the shift fork 20. To clamp the front end of the shift fork using the front clamping mechanism, the two front clamping cylinders respectively drive the tail ends of the two front pressure blocks upward until the pressure posts on the front pressure blocks press into the shallow grooves on the same side. Simultaneously, the rear clamping cylinder drives the rear pressure block downward until the pressure posts on the rear pressure block press against the rear end of the shift fork. At this point, the front and rear ends of the shift fork are respectively clamped by the front and rear clamping mechanisms. This series of support and compression prevents deformation of the shift fork during processing.

[0034] In this structure, if Figure 8 The rear support seat 4 includes a limit seat 41, a avoidance opening is opened on the front side of the limit seat 41, a pad 42 is provided in the avoidance opening, a top column 43 is formed on the pad 42, a V-shaped opening 44 is opened above the front side of the limit seat 41, and a pair of trapezoidal limit strips 45 are formed on the inner wall of the V-shaped opening 44.

[0035] When placing the rear end of the shift fork onto the rear support, the lower lug first passes through the V-shaped opening, supported by the spacer. Because the lug is curved, once it is within the V-shaped opening, the shift fork can be initially positioned within it, while the spacer supports the lower lug, allowing the shift fork to align with the front and rear support seats. Furthermore, a pair of trapezoidal stoppers are formed on the inner wall of the V-shaped opening. This reduces the contact area with the shift fork blank, ensuring proper positioning while also enhancing the strength of the stopper.

[0036] like Figure 3-4A lateral support oil cylinder 21 is provided on the outer side of the rear support seat 4, and a lateral support ram 22 is connected to the drive shaft of the lateral support oil cylinder 21. When the shaft hole on the short shaft, i.e., the position S5 in the figure, is to be processed, the lateral support oil cylinder will drive the lateral support ram to move toward the shift fork until the shift fork is supported by the push. Under the push limit of the lateral support ram, the subsequent processing of the shaft hole can be more stable, and the deformation of the shift fork during the processing can be avoided. When the upper surface of the shift fork is processed, the shift fork can be adjusted so that the lower surface of the shift fork faces upward, and the positioning processing fixture clamps the shift fork again, and the positions S1-S4 on the lower surface can be processed.

[0037] like Figure 7 As a further preferred structure, the positioning chamfering fixture includes front and rear support blocks 23 and positioning pins 24, a support platform 25 is provided on the front side of the support block 23, and a support protrusion 26 is formed on the support block 23. A pair of front and rear fixed cylinders 27 are provided on the carrier 1 facing the support block 23 and the positioning pin 24 respectively, the driving shaft of the front fixed cylinder is provided with a lifting block 28, a triangular pressing block 29 is provided on the lifting block 28, and a support rod 30 is provided on the driving shaft of the rear fixed cylinder.

[0038] After the S1-S4 positions and S5 on the upper and lower surfaces of the shift fork are processed, the shift fork can be clamped and positioned by the positioning chamfering fixture to chamfer the shaft hole and mounting hole of the shift fork. Figure 7 First, place the shift fork on the support platform, support block, and locating pin as required. At this time, the locating pin passes through the mounting hole of the upper ear seat, and the locating pin plays the role of preliminary positioning of the shift fork. The support protrusion supports the middle part of the shift fork, and the support platform supports the front end of the shift fork. Then the front fixed cylinder drives the lifting block to move downward until the triangular lower pressure block presses the front ends of the shift fork and the middle part of the shift fork at the same time, and the positioning and clamping of the shift fork is completed. Finally, the fixed cylinder drives the support rod to support the lower ear seat. At this time, the mounting hole of the lower ear seat and the shaft hole of the short shaft can be chamfered. When the mounting hole of the upper ear seat needs to be chamfered, you only need to adjust the installation position of the shift fork so that the lower ear seat is set downward.

[0039] In the above structure, a pair of limit blocks 31 are provided on the support platform 25. When the front end of the shift fork is placed on the support platform as required, the two limit blocks are located on the inner side of the shift fork, and the limit blocks can limit the left and right sides of the shift fork.

[0040] Finally, if Figure 2-3The platform 1 is provided with lifting rings 32 above each of its four corners and supports 33 below. There are four of each. The supports support the platform, and to move the fixture, tools such as ropes can be tied to the lifting rings. The fixture can then be moved by pulling the ropes.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A special positioning fixture for shift fork processing, characterized by: The special positioning fixture for fork processing includes a carrier, and a group of positioning processing fixtures and a group of positioning chamfering fixtures are respectively provided on the carrier. The positioning processing fixture includes an inclined pull seat assembly, a pair of front support seats, and a rear support seat, which are arranged in sequence from front to back. A pair of auxiliary support oil cylinders are respectively provided on the left and right sides and the front side of the inclined pull seat assembly. The driving shaft of the auxiliary support oil cylinder is provided with an auxiliary support head. Front and rear clamping mechanisms are respectively provided on the carrier facing the front support seat and the rear support seat. The inclined pull seat assembly includes a base, a slide groove is opened in the base, and a pair of wedge blocks are slidably provided in the slide groove. Clamps are provided on the outer side of the wedge blocks, and a centering pressure head is provided inwardly of the clamping jaws. A driving assembly for driving the two clamping jaws to move synchronously is provided on the carrier.

2. A special positioning fixture for shift fork processing according to claim 1, characterized in that: The inner side of the wedge block is provided with an upward and inward inclined groove, and a lifting sleeve is inserted into the slide groove between the two wedge blocks. T-shaped inclined pull blocks are formed on both sides of the top of the lifting sleeve, and the two sides of the inclined pull blocks are respectively embedded in the corresponding inclined grooves. The driving assembly includes a pushing cylinder installed at the bottom of the carrier, and the driving shaft of the pushing cylinder is provided with a lifting rod, which is inserted into the lifting sleeve, and a spring is provided on the lifting rod located in the lifting sleeve.

3. A special positioning fixture for shift fork processing as claimed in claim 2, characterized in that: The rear support seat includes a limit seat, a front side of the limit seat is provided with an avoidance opening, a pad is provided in the avoidance opening, a top column is formed on the pad, a V-shaped opening is opened above the front side of the limit seat, and an inner wall of the V-shaped opening is formed with a pair of trapezoidal limit strips.

4. A special positioning fixture for shift fork processing as claimed in claim 3, characterized in that: A lateral support oil cylinder is provided on the outer side of the rear support seat, and a lateral support ram is connected to the driving shaft of the lateral support oil cylinder.

5. A special positioning fixture for shift fork processing as claimed in claim 4, characterized in that: The front clamping mechanism and the rear clamping mechanism both include a clamping cylinder, wherein a connecting seat is rotatably provided on the front clamping cylinder, a front clamping block is rotatably provided in the connecting seat, the driving shaft of the front clamping cylinder is rotatably connected to the tail of the front clamping block, and a rear clamping block is provided on the driving shaft of the rear clamping cylinder, and clamping columns are provided on both the front clamping block and the rear clamping block.

6. A special positioning fixture for shift fork processing as claimed in claim 5, characterized in that: The positioning chamfering fixture includes support blocks and positioning pins arranged in front and back, a support platform is provided on the front side of the support block, a support protrusion is formed on the support block, and a pair of front and rear fixed cylinders are provided on the carrier facing the support block and the positioning pin respectively, the driving shaft of the front fixed cylinder is provided with a lifting block, a triangular pressing block is provided on the lifting block, and the driving shaft of the rear fixed cylinder is provided with a support rod.

7. A special positioning fixture for shift fork processing as claimed in claim 6, characterized in that: A pair of limiting blocks are provided on the supporting platform.

8. A special positioning fixture for shift fork processing according to claim 7, characterized in that: There are hanging rings above the four corners of the platform and supports below.

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