Clamp for bus wheel hub

Abstract

The utility model relates to a clamp for bus wheel hub, including clamping support seat, set up at the surface of clamping support seat a plurality of pressure mechanism, the pressure mechanism can compress the flange surface of wheel hub of clamping support seat surface, the inside of clamping support seat is equipped with the placement groove of adapting to spoke shape, the inside of placement groove is equipped with the limiting element of limiting wheel hub axial rotation, the utility model combines the vertical direction pressure of perpendicular type clamp pliers with the axial positioning of limiting pin shaft, realizes the vertical direction limit of the flange of wheel hub after compression, plus the axial rotation limit of limiting pin shaft in the inside of bolt hole.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub clamping technology, specifically to a clamping device for bus wheel hubs. Background Technology

[0002] The manufacturing process for bus wheel hubs mainly includes casting, machining, and surface treatment. First, molten aluminum alloy is poured into a mold using a low-pressure casting process. After cooling, the casting undergoes heat treatment to improve material properties. In the machining stage, a CNC lathe is used to precisely machine the center hole, bolt holes, and mounting surfaces of the wheel hub to ensure dimensional accuracy and dynamic balance requirements. Finally, surface treatment is completed through shot peening, electroplating, or spraying.

[0003] Grinding the wheel spokes is a crucial step, primarily for three purposes: first, to remove burrs and flash from the casting process, ensuring a smooth appearance; second, to eliminate stress concentration points and improve structural strength; and third, to provide a good base surface for subsequent painting. During grinding, a special clamp must be used to hold the wheel hub in place, ensuring even stress on each spoke and preventing uneven thickness caused by manual operation. Mechanized grinding, typically using a belt sander or polishing wheel, ensures both efficiency and improved surface finish.

[0004] The authorization announcement number CN222643846U discloses a positioning fixture for machining automobile wheel hubs. According to its specification and drawings, when the motor rotates, it can drive the worm gear to rotate, and the worm gear can drive the rotating worm wheel to rotate. In turn, multiple arc-shaped guide grooves can drive multiple push slides to move, thereby driving multiple sliding limit seats to move synchronously along the direction of the rectangular guide groove. This enables the synchronous clamping and releasing of the wheel hub.

[0005] However, there are some limitations to this solution: 1. Using a worm gear transmission to drive the sliding limit seat makes the L-shaped sliding block's clamping efficiency for the wheel hub too low, reducing production efficiency; 2. In this solution, before clamping the wheel hub, the center positioning hole of the wheel hub is first passed through the center positioning sleeve rod, but this passing through obviously cannot effectively restrict the axial rotation of the wheel hub, which brings inconvenience to the subsequent spoke grinding. Summary of the Invention

[0006] This invention addresses the problem of universality in clamping wheel rims of different specifications. It proposes a clamp for bus wheel hubs that combines the vertical pressure of the vertical clamp with the axial positioning of the limiting pin to achieve vertical positioning of the wheel hub rim after being pressed. In addition, the limiting pin inside the bolt hole provides axial rotational positioning.

[0007] The objective of this invention is achieved through the following technical solution: a clamp for a bus wheel hub, comprising a clamping support base, a plurality of pressing mechanisms disposed on the surface of the clamping support base, wherein the pressing mechanisms are capable of pressing the wheel rim surface of the wheel hub on the surface of the clamping support base, wherein the interior of the clamping support base is provided with a placement groove adapted to the shape of the wheel spoke, and the interior of the placement groove is provided with a limiting element for restricting the axial rotation of the wheel hub.

[0008] Preferably, the clamping support includes a first support plate, a plate support column, and a second support plate. A plurality of plate support columns are detachably connected to the surface of the first support plate, and the second support plate is detachably connected to the top of the plate support column. The limiting element is disposed on the surface of the first support plate, and the placement groove is disposed on the surface of the second support plate.

[0009] Preferably, the limiting element includes a positioning sleeve adapted to the center hole of the wheel hub and a limiting pin mounted on the positioning sleeve. After the wheel hub is placed on the surface of the second support plate, the center hole of the wheel hub is engaged with the positioning sleeve and the bolt hole of the wheel hub is engaged with the limiting pin.

[0010] Preferably, the surfaces of the first support plate, the second support plate, and the positioning sleeve are provided with a plurality of bolt mounting holes. The first support plate and the second support plate are detachably connected to both ends of the plate support column through the bolt mounting holes and bolts. The positioning sleeve is detachably connected to the surface of the first support plate through the bolt mounting holes and bolts. The top of the placement groove has a chamfer. The chamfer design of the placement groove is to avoid scratching the rim of the wheel hub.

[0011] Preferably, the clamping mechanism includes a cylinder mounting sleeve, a cylinder body, and a vertical clamp. The cylinder mounting sleeve is disposed on the surface of the clamping support. One end of the cylinder mounting sleeve is hinged to the end of the cylinder body of the cylinder body, and the other end of the cylinder mounting sleeve is provided with a vertical clamp. The piston rod of the cylinder body is hinged to the vertical clamp, and the clamping head of the vertical clamp moves with the movement of the piston rod.

[0012] Preferably, the vertical clamp includes a clamp base, a connecting rod assembly, a chuck support arm, and a chuck. The clamp base is located at the other end of the cylinder mounting sleeve. The connecting rod assembly is internally hinged to the clamp base. The connecting rod assembly is internally hinged to the side wall of the chuck support arm. One end of the chuck support arm is hinged to the end of the clamp base. The top of the connecting rod assembly is hinged to the end of the piston rod of the cylinder body. The chuck support arm is connected to the end of the chuck support arm.

[0013] Preferably, the linkage assembly includes a first linkage and a second linkage, the bottom of each first linkage is hinged to the middle of the clamp base, the bottom of each second linkage is hinged to the side wall of the chuck support arm, and the tops of both the first linkage and the second linkage are hinged to the end of the piston rod of the cylinder body.

[0014] Preferably, the surface of the first support plate is also provided with several waist-shaped through holes through which running bolts pass. The design of the waist-shaped through holes makes it easy to adjust the installation position after loosening the bolts inside the waist-shaped through holes when the entire clamping support is installed on the surface of the workbench, which brings convenience to the installation process.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By combining the vertical pressure of the vertical clamp with the axial positioning of the limiting pin, the vertical positioning of the wheel hub rim after being pressed is achieved. In addition, the limiting pin inside the bolt hole provides axial rotational limiting. Compared with the traditional clamping method, this design has a higher clamping stability and significantly improves the subsequent spoke polishing effect.

[0017] 2. When the wheel hub is placed on the first support plate, the center hole of the wheel hub will be locked on the positioning sleeve rod, and the limiting pin will also be locked in the bolt hole in the middle of the wheel hub at the same time, thereby restricting the axial rotation of the wheel hub. Subsequently, the clamping mechanism will press the wheel rim of the wheel hub to quickly achieve complete locking of the wheel hub, so that the wheel hub cannot move or rotate axially, saving the time required to fully lock the wheel hub lock and improving production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention when clamping a wheel hub;

[0019] Figure 2 This is a perspective view of the present utility model;

[0020] Figure 3 This is a perspective view of the present utility model;

[0021] Figure 4 This is a schematic diagram of the present invention after the first support plate and the plate support column have been removed;

[0022] Figure 5 For the present utility model in Figure 2 A magnified view of a portion of region A.

[0023] The markings in the diagram are: 1. Clamping support base; 11. First support plate; 12. Plate support column; 13. Second support plate; 10. Placement slot; 111. Waist-shaped through hole; 2. Clamping mechanism; 21. Cylinder mounting sleeve; 22. Cylinder body; 23. Vertical clamp; 231. Linkage assembly; 232. Clamp base; 233. Chuck support arm; 234. Chuck; 2311. First connecting rod; 3212. Second connecting rod; 3. Limiting element; 31. Positioning sleeve rod; 32. Limiting pin; 4. Bolt mounting hole. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0025] like Figure 1 and Figure 2 As shown, a clamp for a bus wheel hub includes a clamping support 1 and several pressing mechanisms 2 disposed on the surface of the clamping support 1. The pressing mechanisms 2 are capable of pressing the wheel rim surface of the wheel hub on the surface of the clamping support 1. The clamping support 1 has a placement groove 10 adapted to the shape of the wheel spoke inside.

[0026] Before grinding the spokes of the wheel hub, the wheel hub is placed on the surface of the clamping support 1, so that the spokes of the wheel hub are embedded in the placement groove 10. Then, the clamping mechanism 2 can clamp the rim of the wheel hub, thereby locking the upper and lower positions of the wheel hub.

[0027] Please continue to refer to this. Figure 3 In this embodiment, the clamping support 1 includes a first support plate 11, plate support columns 12, and a second support plate 13. A plurality of plate support columns 12 are detachably connected to the surface of the first support plate 11, and the second support plate 13 is detachably connected to the top of each plate support column 12. The limiting element 3 is disposed on the surface of the first support plate 11, and the placement groove 10 is disposed on the surface of the second support plate 13. The surface of the first support plate 11 also has a plurality of oblong through holes 111 through which running bolts pass.

[0028] Please continue to refer to this. Figure 4 The first support plate 11, the second support plate 13 and the positioning sleeve 31 are all provided with a plurality of bolt mounting holes 4. The first support plate 11 and the second support plate 13 are detachably connected to the two ends of the plate support column 12 through the bolt mounting holes 4 and bolts. The positioning sleeve 31 is detachably connected to the surface of the first support plate 11 through the bolt mounting holes 4 and bolts. The top of the placement groove 10 has a chamfer.

[0029] The detachable design between the first support plate 11, the plate support column 12, and the second support plate 13 allows for individual replacement of any damaged part, reducing the overall cost of the fixture. The design of the oblong through hole 111 facilitates position adjustment when the clamping support 1 is mounted on the workbench surface by loosening the bolts inside the oblong through hole 111, simplifying the installation process. The chamfered design of the placement groove 10 prevents scratching the wheel hub rim.

[0030] Please refer to Figure 2 and Figure 3 As shown, the placement groove 10 is provided with a limiting element 3 to restrict the axial rotation of the wheel hub. The limiting element 3 includes a positioning sleeve 31 adapted to the center hole of the wheel hub and a limiting pin 32 installed on the positioning sleeve 31. After the wheel hub is placed on the surface of the second support plate 13, the center hole of the wheel hub is locked on the positioning sleeve 31 and the bolt hole of the wheel hub is locked on the limiting pin 32.

[0031] Once the wheel hub is placed on the first support plate 11, and the spokes of the hub sink into the placement groove 10, the limiting pin 32 simultaneously engages with one of the bolt holes in the PCD (pitch circle diameter) of the wheel hub. The PCD is a key parameter of the wheel hub, determining the degree of fit between the wheel hub and the vehicle's mounting bolt holes, directly affecting the stability and safety of the installation.

[0032] With this setup, whenever the hub is placed on the first support plate 11, the center hole of the hub will engage with the positioning sleeve 31, ensuring that the hub's axis is aligned with the center line of the entire fixture. This guarantees that each hub placed in the fixture is in the same position. Simultaneously, whenever the hub is placed on the first support plate 11, the limiting pin 32 also engages with the aforementioned bolt hole, thus restricting the axial rotation of the hub. Combined with the clamping mechanism 2, which clamps the hub's rim, this achieves complete locking of the hub, preventing it from moving even during grinding. This significantly improves the subsequent spoke grinding effect.

[0033] Please continue to refer to this. Figure 4 and Figure 5 The clamping mechanism 2 includes a cylinder mounting sleeve 21, a cylinder body 22, and a vertical clamp 23. The cylinder mounting sleeve 21 is disposed on the surface of the clamping support 1. One end of the cylinder mounting sleeve 21 is hinged to the end of the cylinder body of the cylinder body 22. The other end of the cylinder mounting sleeve 21 is provided with a vertical clamp 23. The piston rod of the cylinder body 22 is hinged to the vertical clamp 23. The chuck 234 of the vertical clamp 23 moves with the movement of the piston rod of the cylinder body 22.

[0034] In this embodiment, the vertical clamp 23 includes a clamp base 232, a connecting rod assembly 231, a chuck support arm 233, and a chuck 234. The clamp base 232 is disposed at the other end of the cylinder mounting sleeve 21. The connecting rod assembly 231 is hinged to the inside of the clamp base 232. The connecting rod assembly 231 is hinged to the side wall of the chuck support arm 233. One end of the chuck support arm 233 is hinged to the end of the clamp base 232. The top of the connecting rod assembly 231 is hinged to the end of the piston rod of the cylinder body 22. The end supported by the chuck 234 is connected to the chuck 234. The connecting rod assembly 231 includes a first connecting rod 2311 and a second connecting rod 2312. The bottom of each first connecting rod 2311 is hinged to the middle of the clamp base 232, and the bottom of each second connecting rod 2312 is hinged to the side wall of the chuck support arm 233. The tops of both the first connecting rod 2311 and the second connecting rod 2312 are hinged to the end of the piston rod of the cylinder body 22.

[0035] During the extension and retraction process, the piston rod of the cylinder body 22 can pull the tops of the first connecting rod 2311 and the second connecting rod 2312 to change their positions. At this time, the tops of the first connecting rod 2311 and the second connecting rod 2312 rotate relative to the end of the piston rod, and the bottom of the first connecting rod 2311 rotates relative to the side wall of the cylinder body 22, while the bottom of the second connecting rod 2312 rotates relative to the side wall of the chuck support arm 233. The second connecting rod 2312 can gradually pull up or lower the chuck support arm 233, and during the pulling up or lowering process, one end of the chuck support arm 233 rotates relative to the end of the clamp base 232.

[0036] During the process of being pulled up or down by the second link 2312, the chuck support arm 233 can simultaneously drive the chuck 234 to change position, so that the bottom of the chuck 234 can press against or release the rim of the wheel hub.

[0037] Working principle and usage of this utility model:

[0038] Before grinding the spokes of the wheel hub, the wheel hub is placed on the surface of the clamping support 1, so that the spokes of the wheel hub are recessed into the placement groove 10. Each time the wheel hub is placed on the first support plate 11, the center hole of the wheel hub is engaged with the positioning sleeve 31, ensuring that the axis of the wheel hub is aligned with the center line of the entire clamp, and that each wheel hub placed in the clamp is in the same position. Each time the wheel hub is placed on the first support plate 11, the limiting pin 32 is also engaged in the bolt hole, thereby restricting the axial rotation of the wheel hub.

[0039] Then, during the extension and retraction of the piston rod of the cylinder body 22, it can pull the tops of the first connecting rod 2311 and the second connecting rod 2312 to change their positions. At this time, the tops of the first connecting rod 2311 and the second connecting rod 2312 rotate relative to the end of the piston rod, and the bottom of the first connecting rod 2311 rotates relative to the side wall of the cylinder body 22, while the bottom of the second connecting rod 2312 rotates relative to the side wall of the chuck support arm 233. The second connecting rod 2312 can gradually lower the chuck support arm 233. During the lowering process, one end of the chuck support arm 233 rotates relative to the end of the clamp base 232. As the chuck support arm 233 is pulled up or lowered by the second connecting rod 2312, it can simultaneously drive the chuck 234 to change its position, so that the bottom of the chuck 234 can press against or release the rim of the hub.

[0040] At this point, the wheel hub is completely locked and will not move while it is being polished, which significantly improves the polishing effect of the subsequent spokes.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A clamp for a bus wheel hub, comprising a clamping support (1) and a plurality of pressing mechanisms (2) disposed on the surface of the clamping support (1), characterized in that, The clamping mechanism (2) can clamp the wheel rim surface of the hub on the surface of the clamping support (1). The clamping support (1) has a placement groove (10) adapted to the shape of the spokes inside. The placement groove (10) has a limiting element (3) that restricts the axial rotation of the hub inside.

2. The clamp for bus wheel hubs according to claim 1, characterized in that, The clamping support base (1) includes a first support plate (11), a plate support column (12), and a second support plate (13). The surface of the first support plate (11) is detachably connected to a plurality of plate support columns (12), and the top of the plate support column (12) is detachably connected to the second support plate (13). The limiting element (3) is disposed on the surface of the first support plate (11), and the placement groove (10) is disposed on the surface of the second support plate (13).

3. The clamp for bus wheel hubs according to claim 2, characterized in that, The limiting element (3) includes a positioning sleeve (31) adapted to the center hole of the hub and a limiting pin (32) mounted on the positioning sleeve (31). After the hub is placed on the surface of the second support plate (13), the center hole of the hub is locked on the positioning sleeve (31) and the bolt hole of the hub is locked on the limiting pin (32).

4. The clamp for bus wheel hubs according to claim 3, characterized in that, The surfaces of the first support plate (11), the second support plate (13) and the positioning sleeve (31) are provided with a plurality of bolt mounting holes (4). The first support plate (11) and the second support plate (13) are detachably connected to the two ends of the plate support column (12) through the bolt mounting holes (4) and the bolts. The positioning sleeve (31) is detachably connected to the surface of the first support plate (11) through the bolt mounting holes (4) and the bolts. The top of the placement groove (10) has a chamfer.

5. The clamp for a bus wheel hub according to claim 1, characterized in that, The clamping mechanism (2) includes a cylinder mounting sleeve (21), a cylinder body (22), and a vertical clamp (23). The cylinder mounting sleeve (21) is disposed on the surface of the clamping support (1). One end of the cylinder mounting sleeve (21) is hinged to the end of the cylinder body of the cylinder body (22). The other end of the cylinder mounting sleeve (21) is provided with a vertical clamp (23). The piston rod of the cylinder body (22) is hinged to the vertical clamp (23). The chuck (234) of the vertical clamp (23) moves with the movement of the piston rod of the cylinder body (22).

6. The clamp for a bus wheel hub according to claim 5, characterized in that, The vertical clamp (23) includes a clamp base (232), a connecting rod assembly (231), a chuck support arm (233), and a chuck (234). The clamp base (232) is located at the other end of the cylinder mounting sleeve (21). The connecting rod assembly (231) is hinged to the inside of the clamp base (232). The connecting rod assembly (231) is hinged to the side wall of the chuck support arm (233). One end of the chuck support arm (233) is hinged to the end of the clamp base (232). The top of the connecting rod assembly (231) is hinged to the end of the piston rod of the cylinder body (22). The end supported by the chuck (234) is connected to the chuck (234).

7. The clamp for a bus wheel hub according to claim 6, characterized in that, The connecting rod assembly (231) includes a first connecting rod (2311) and a second connecting rod (2312). The bottom of each first connecting rod (2311) is hinged to the middle of the clamp base (232), and the bottom of each second connecting rod (2312) is hinged to the side wall of the chuck support arm (233). The tops of the first connecting rod (2311) and the second connecting rod (2312) are both hinged to the end of the piston rod of the cylinder body (22).

8. The clamp for a bus wheel hub according to claim 2, characterized in that, The surface of the first support plate (11) is also provided with several waist-shaped through holes (111) through which running bolts pass.

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