A pre-pressing cover fixture

Abstract

This utility model belongs to the bicycle hub manufacturing industry, and particularly relates to the assembly of bicycle hub freehub and disc brakes. Specifically, it relates to a preload cover pressing fixture, which solves the problem that installing preload covers at both ends of a bicycle hub requires two pieces of equipment. It can assemble the preload covers at both ends of the hub simultaneously, saving additional equipment and improving work efficiency. It includes an upper pressing block with a first positioning sleeve at its lower part. The cavity of the first positioning sleeve is used to fit the upper end of the hub body, and the annular end face at the bottom of the first positioning sleeve is used to contact the upper preload cover. A lower pressing block is assembled in the positioning cavity of the positioning pad and can slide up and down relative to it. Its bottom is connected to the positioning pad, and its top is provided with a second positioning sleeve. The annular end face at the top of the second positioning sleeve is used to contact the lower preload cover. The second positioning sleeve is provided with a probe that is inserted into the inner hole of the hub body for positioning.

Description

Technical Field

[0001] This utility model belongs to the bicycle hub manufacturing industry, and in particular relates to the assembly of bicycle hub base and disc brake, specifically to a pre-pressing cover fixture. Background Technology

[0002] Both the freehub end and the disc brake end of the bicycle hub use pre-pressed caps for dust and water protection, but currently this process involves assembling both ends separately. Figure 1 As shown, first position the hub with the disc brake end facing down, positioning the flange near the end on the base. Then, position the hub with the freehub end facing up and install the preload cap from the top. Next, switch to another base, position the hub with the freehub end facing down, positioning the flange near the end on the other base, and then position the hub with the disc brake end facing up, continuing to install the preload cap from the top.

[0003] It is easy to see that this method is not only repetitive, tedious, and inefficient, but also requires two machines to complete the process, resulting in complicated operation and increased workload. Utility Model Content

[0004] This utility model provides a pre-pressure cover fixture, which solves the problem that installing pre-pressure covers at both ends of bicycle hubs requires two pieces of equipment. It can assemble the pre-pressure covers at both ends of the hub simultaneously, saving additional equipment and improving work efficiency.

[0005] This utility model is achieved through the following technical solution: A pre-compression fixture includes a fixed base and further includes, The upper pressure block has a first positioning sleeve at its lower part. The cavity of the first positioning sleeve is used to fit the upper end of the hub body, and the annular end face at the bottom of the first positioning sleeve is used to contact the upper pre-press cover. The positioning pad is elastically connected to the fixed base and has vertically distributed positioning cavities. The top of the positioning cavity is provided with a positioning groove for placing the bottom flange of the hub body. The lower pressure block is assembled in the positioning cavity of the positioning pad and can slide up and down relative to it. Its bottom is connected to the positioning pad, and its top is provided with a second positioning sleeve. The cavity of the second positioning sleeve is used to fit the lower end of the hub body. The annular end face of the top of the second positioning sleeve is used to contact the lower pre-pressure cover. The second positioning sleeve is provided with a poker that is inserted into the inner hole of the hub body for positioning.

[0006] Furthermore, the top surface of the fixed base is provided with multiple spring grooves, and springs are fixed in the spring grooves. The top end of the springs is fixedly connected to the bottom surface of the positioning pad.

[0007] Furthermore, the lower pressure block is provided with an assembly hole that communicates with the second positioning sleeve, the poker is threadedly connected in the assembly hole, and the bottom end of the poker is fixed to the fixed base by a bolt assembly.

[0008] Furthermore, the top of the poker is higher than the second positioning sleeve of the lower pressure block.

[0009] Furthermore, the outer side of the pressing block is a stepped shaft.

[0010] Furthermore, the outer side of the positioning pad is cylindrical.

[0011] The beneficial effects achieved by this utility model compared with the prior art are as follows: 1. Through the design of the pre-pressing cover fixture of this utility model, the pre-pressing covers at both ends are assembled simultaneously. During the operation process, the product only needs to be picked up once and pressed once to complete the simultaneous pressing and assembly of both ends. This not only simplifies the operation steps and meets the assembly requirements, but also saves additional equipment and improves work efficiency. 2. Previously, two separate devices were needed to install the pre-compression cap. With the device of this utility model, one device can be saved, reducing production costs. 3. Through the structural design of this utility model, two pre-pressed covers are assembled simultaneously, which not only improves work efficiency but also greatly improves assembly quality. Attached Figure Description

[0012] Figure 1 Diagram of the pre-compression cover installation process in the prior art; Figure 2 This is a schematic diagram of the pre-pressing cover fixture described in this utility model; In the diagram: 1. Fixed base, 2. Upper pressure block, 3. First positioning sleeve, 4. Positioning pad, 5. Positioning groove, 6. Lower pressure block, 7. Second positioning sleeve, 8. Sting rod, 9. Spring. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0014] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0015] To accommodate the pre-press caps installed at both ends of the bicycle hub using a pressing device, such as... Figure 2 As shown, this embodiment discloses a pre-pressing cover fixture, which mainly includes a fixed base 1, an upper pressing block 2, a positioning pad 4, and a lower pressing block 6. The upper end of the upper pressing block 2 is fixedly connected to the pressing device of the pressing equipment. A first positioning sleeve 3 is machined on the lower part of the upper pressing block 2. The cavity of the first positioning sleeve 3 is used to fit the upper end of the hub body. The bottom end face of the first positioning sleeve 3 is an annular end face, used to contact the upper pre-pressing cover.

[0016] The fixed base 1 is installed on the worktable of the pressing equipment. Three spring grooves are machined on the top surface of the fixed base 1, and springs 9 are fixed in the spring grooves. The outer side of the positioning pad 4 is cylindrical. The top of each spring 9 is fixedly connected to the bottom surface of the positioning pad 4, so that the positioning pad 4 and the fixed base 1 are elastically connected and can move up and down relative to each other. Vertically distributed positioning cavities are machined at the center of the positioning pad 4. The cross-sectional area of ​​the positioning cavity is circular, and a positioning groove 5 is machined on the top of the positioning cavity. The positioning groove 5 is used to position and place the flange at the bottom of the hub body.

[0017] The outer side of the lower pressure block 6 is a stepped shaft, allowing it to be assembled into the positioning cavity of the positioning pad 4 and slide relative to it. A second positioning sleeve 7 is machined on the top of the lower pressure block 6. The cavity of the second positioning sleeve 7 is used to fit the lower end of the hub body. The top end face of the second positioning sleeve 7 is an annular end face, which is used to contact the lower preload cover. An assembly hole communicating with the second positioning sleeve 7 is machined at the center of the lower pressure block 6. The poker 8 is threaded into the assembly hole, and the bottom end of the poker 8 is fixed to the fixed base 1 by a bolt assembly, thus fixing the lower pressure block 6 to the fixed base 1. The top end of the poker 8 is higher than the second positioning sleeve 7 of the lower pressure block 6, facilitating the insertion of the poker 8 into the inner hole of the hub body for positioning.

[0018] The working process of the pre-pressing cover fixture described in this embodiment is as follows: S01. First, position the lower pre-pressure cover on the second positioning sleeve of the lower pressure block. S02. Position the base of the hub body downwards, place the flange at the lower end of the hub body into the positioning groove of the positioning pad, and insert the piercing rod into the inner hole of the hub body for positioning. S03. Position the upper pre-press cover on the upper end of the hub body and start the pressing device; S04. The upper pressure block presses down to close the upper pre-pressure cover, while the hub body and positioning pad move down, and the lower pressure block remains stationary, so that the upper and lower pre-pressure covers are pressed together at the same time.

[0019] With the above-mentioned pre-pressing cover fixture design, the pre-pressing covers at both ends are assembled simultaneously. During the operation, the product only needs to be picked up once and pressed once to complete the simultaneous pressing assembly of both ends. This not only simplifies the operation steps and meets the assembly requirements, but also saves additional equipment and improves work efficiency.

Claims

1. A pre-pressing cover fixture, comprising a fixed base (1), characterized in that, It also includes, The upper pressure block (2) has a first positioning sleeve (3) at its lower part. The cavity of the first positioning sleeve (3) is used to fit the upper end of the flower drum body. The annular end face at the bottom of the first positioning sleeve (3) is used to contact the upper pre-press cover. The positioning pad (4) is elastically connected to the fixed base (1) and has vertically distributed positioning cavities. The top of the positioning cavity is provided with a positioning groove (5) that can accommodate the bottom flange of the flower drum body. The lower pressure block (6) is assembled in the positioning cavity of the positioning pad (4) and can slide up and down relative to it. Its bottom is connected to the positioning pad (4), and its top is provided with a second positioning sleeve (7). The cavity of the second positioning sleeve (7) is used to fit the lower end of the hub body. The annular end face of the top of the second positioning sleeve (7) is used to contact the lower pre-press cover. The second positioning sleeve (7) is provided with a poker (8) inserted into the inner hole of the hub body for positioning.

2. The pre-pressing cover fixture according to claim 1, characterized in that, The top surface of the fixed base (1) is provided with multiple spring grooves, and a spring (9) is fixed in the spring groove. The top end of the spring (9) is fixedly connected to the bottom surface of the positioning pad (4).

3. The pre-pressing cover fixture according to claim 1, characterized in that, The lower pressure block (6) is provided with an assembly hole that connects to the second positioning sleeve (7). The poker (8) is threadedly connected to the assembly hole, and the bottom end of the poker (8) is fixed to the fixed base (1) by a bolt assembly.

4. The pre-pressing cover fixture according to claim 3, characterized in that, The top of the poker (8) is higher than the second positioning sleeve (7) of the lower pressure block (6).

5. The pre-pressing cover fixture according to any one of claims 1-4, characterized in that, The outer side of the pressing block (6) is a stepped shaft.

6. The pre-pressing cover fixture according to any one of claims 1-4, characterized in that, The outer side of the positioning pad (4) is cylindrical.

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