CN214445890U - Bicycle crank dismounting device - Google Patents

Abstract

The utility model relates to a bicycle crank dismounting device, include: the clamp comprises a first clamping plate, a second clamping plate and a fixing device, the first clamping plate and the second clamping plate are detachably connected together through the fixing device to form the clamp, and a plurality of shaft holes are formed in the plate surface of the clamp; the ejection component comprises a connecting rod, a first gripper, a second gripper, a jack screw and a handle, the connecting rod is transversely arranged, the first gripper and the second gripper are respectively arranged at two ends of the connecting rod, the lower ends of the first gripper and the second gripper are respectively provided with an inward-bent claw, and the horizontal distance between the first gripper and the second gripper is greater than the width of the clamp; the jackscrew passes and extends to between first tongs and the second tongs behind the hole in the middle of the connecting rod, and is threaded connection between jackscrew and the connecting rod, and the upper end at the jackscrew is fixed to the handle. The dismounting device can avoid damage to rotating parts such as bearings and the like, increases the stress area, and simultaneously ensures the uniformity of force transmission by adopting the spiral jackscrew.

Description

Bicycle crank dismounting device

Technical Field

The utility model relates to a bicycle maintenance equipment technical field especially relates to a bicycle crank dismounting device.

Background

The information disclosed in the background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information constitutes prior art that is already known to a person of ordinary skill in the art.

At present, a special dismounting device for a bicycle crank is not available, and a maintainer can only adopt a rough dismounting mode of prying by a crowbar or smashing by a hammer to dismount, so that the crank is deformed, a middle shaft is bent, a front chain wheel is deformed seriously, a bicycle chain is fallen off or blocked, and the riding of a bicycle is influenced.

At present, the main tool for disassembling shaft rotating parts is a pulling tool, namely a common belt scraper, the pulling force of the tool is applied to three action points on the periphery of the rotating parts, the action points are stressed greatly and are easy to generate unbalanced stress. In addition, when the traditional puller is used for disassembling the small bearing, acting force is only applied to the bearing outer ring, and the bearing is easy to damage due to the small radial bearing force of the small bearing, namely the traditional puller is not suitable for disassembling the small bearing. Therefore, when rotating parts such as a bearing are disassembled, disassembling tension acts on the outer ring, so that a bearing rotating body and a retainer are damaged, and the running quality of the bearing is seriously affected.

SUMMERY OF THE UTILITY MODEL

To foretell problem, the utility model provides a bicycle crank dismounting device, this kind of dismounting device can avoid the destruction to rotating parts such as bearings, has increased lifting surface area, adopts the spiral jackscrew to guarantee the homogeneity of power transmission simultaneously. In order to achieve the above object, the technical solution of the present invention is as follows.

A bicycle crank removal device comprising a clamp and an ejection member, wherein: anchor clamps include first splint, second splint, anchor clamps fixing device, first splint, second splint can dismantle through anchor clamps fixing device and link together and form anchor clamps, a plurality of shaft hole has been seted up on the face of anchor clamps, just the shaft hole spans the interface of connecting of first splint, second splint to rotating parts such as bearing are dismantled to the needs and are pressed from both sides tightly in the shaft hole. The ejection component comprises a connecting rod, a first gripper, a second gripper, a jack screw and a handle, the connecting rod is transversely arranged, the first gripper and the second gripper are respectively arranged at two ends of the connecting rod, the lower ends of the first gripper and the second gripper are respectively provided with a claw which is bent inwards, and the horizontal distance between the first gripper and the second gripper is greater than the width of the clamp, so that the clamp can be placed between the first gripper and the second gripper. The jackscrew passes and extends to between first tongs and the second tongs behind the hole in the middle of the connecting rod, and is threaded connection between jackscrew and the connecting rod, the upper end at the jackscrew is fixed to the handle to realize the regulation to the jackscrew through rotating handle.

Further, the diameters of a plurality of shaft holes are different, so that the fixing device is suitable for fixing bearings with different diameters.

Further, anchor clamps fixing device includes bolt and nut, be provided with the connecting hole on first splint, the second splint, the bolt passes and is connected with the nut behind this connecting hole to connect first splint, second splint for detachable is whole.

Further, the nut is a wing nut so as to be convenient for manual disassembly.

Further, the clamp and the ejection part are both made of metal materials, preferably stainless steel or aluminum alloy.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the clamp of the utility model consists of two parts which can be combined and connected, and is provided with a plurality of shaft holes with different apertures so as to be suitable for different shaft necks; the ejection part can conveniently fasten the clamp, so that the defect that the common puller is unbalanced in force and easy to fall off is overcome; meanwhile, the ejection component amplifies the moment by utilizing the spiral motion of the jackscrew, saves labor, has concentrated action points, reduces the influence on non-disassembly parts, and has small volume, light weight, convenient single-person operation and no need of the assistance of other personnel.

(2) The utility model discloses a this dismounting device also can be used to the dismantlement of miniature bearing, compares with traditional bearing drawing tool, has protected the rotating part who is dismantled at the bearing dismantlement in-process, avoids the bearing overcoat atress and damages the bearing, saves the maintenance cost.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic structural view of a clamp according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an ejection part in an embodiment of the present invention.

Fig. 3 is a schematic view of the bicycle crank dismounting device in the use state according to the embodiment of the present invention.

The above referenced figures represent: 1-a first clamping plate, 2-a second clamping plate, 3-a clamp fixing device, 4-an axle hole, 5-a connecting rod, 6-a first gripper, 7-a second gripper, 8-a jackscrew, 9-a handle, 10-a bolt and 11-a nut.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and do not limit the structure, but merely facilitate the description of the present invention, and do not indicate or imply that the device or element being referred to needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The invention will now be further described with reference to the drawings and specific examples.

Referring to fig. 1 and 2, a bicycle crank removing device is illustrated, comprising a clamp and an ejector member, wherein:

the jig includes: the clamp fixing device comprises a first clamp plate 1, a second clamp plate 2 and a clamp fixing device 3, wherein the clamp fixing device 3 comprises a bolt 10 and a nut 11, and the nut 11 is a wing-shaped nut so as to be convenient for manual disassembly. The first clamping plate 1 and the second clamping plate 2 are provided with connecting holes, and the bolt 10 is connected with the nut 11 after penetrating through the connecting holes, so that the first clamping plate 1 and the second clamping plate 2 are connected into a detachable clamp. Three shaft holes 4 with diameters sequentially increased are formed in the plate surface of the clamp, so that the clamp is suitable for fixing bearings with different diameters. The shaft hole crosses the connecting interface of the first clamping plate 1 and the second clamping plate 2, so that rotating parts such as bearings needing to be disassembled are clamped in the shaft hole.

The ejection part includes: connecting rod 5, first tongs 6, second tongs 7, jackscrew 8 and handle 9, connecting rod 5 transversely sets up, first tongs 6 and second tongs 7 set up respectively at the both ends of connecting rod 5, and the lower extreme of first tongs 6, second tongs 7 all has incurved hook, and the horizontal distance between first tongs 6 and the second tongs 7 is greater than the width of anchor clamps to place anchor clamps between first tongs 6 and second tongs 7. Jackscrew 8 passes and extends to between first tongs 6 and the second tongs 7 behind the hole in the middle of connecting rod 5, and is threaded connection between jackscrew 8 and connecting rod 5, handle 9 is fixed in the upper end of jackscrew 8 to realize the regulation to jackscrew 8 through rotating handle 9.

Referring to fig. 3, in use, after a bearing to be disassembled is placed in the shaft hole 4, the first clamping plate 1 and the second clamping plate 2 are fastened together by the clamp fixing device 3, so that the bearing is clamped in the clamp. And then moving the ejection component to enable the clamp to penetrate between the first gripper 6 and the second gripper 7, enabling the claw at the lower end of the gripper to be located below the plate surface of the clamp, enabling the first gripper 6 to be located on one side of the first clamping plate 1, enabling the second clamping plate 2 to be located on one side of the second gripper 7, finally rotating the handle 9 to adjust the jackscrew 8 downwards, enabling the jackscrew 8 to gradually move towards the bearing in the shaft hole 4, gradually ejecting the shaft in the center of the bearing downwards along with the continuous downward movement of the jackscrew 8, and completing the separation and disassembly of the bearing and the shaft.

Finally, it should be understood that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims (6)

1. A bicycle crank removing device, comprising a clamp and an ejection part, wherein: the clamp comprises a first clamping plate, a second clamping plate and a clamp fixing device, wherein the first clamping plate and the second clamping plate are detachably connected together through the clamp fixing device to form the clamp; the ejection component comprises a connecting rod, a first gripper, a second gripper, a jack screw and a handle, the connecting rod is transversely arranged, the first gripper and the second gripper are respectively arranged at two ends of the connecting rod, the lower ends of the first gripper and the second gripper are respectively provided with an inward-bent claw, and the horizontal distance between the first gripper and the second gripper is greater than the width of the clamp; the jackscrew passes and extends to between first tongs and the second tongs behind the hole in the middle of the connecting rod, and is threaded connection between jackscrew and the connecting rod, the upper end at the jackscrew is fixed to the handle.

2. The bicycle crank removal device of claim 1, wherein the diameters of the plurality of axle holes are different.

3. The bicycle crank dismounting device according to claim 1, wherein the clamp fixing device comprises a bolt and a nut, the first clamping plate and the second clamping plate are provided with a connecting hole, and the bolt is connected with the nut after passing through the connecting hole, so that the first clamping plate and the second clamping plate are connected into a detachable whole.

4. The bicycle crank removal device of claim 3, wherein the nut is a wing nut.

5. A bicycle crank removal device according to any one of claims 1 to 4, characterised in that the clamp and the ejector member are both of metal.

6. The bicycle crank disassembly device of claim 5, wherein the metal material comprises stainless steel or aluminum alloy.

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