Hollow crank of bicycle

Abstract

The utility model discloses a bicycle hollow crank, and relates to the technical field of bicycle hollow cranks. The bicycle hollow crank comprises a crank lower cover, a hollow groove is formed in the crank lower cover, and a pre-fixing mechanism is arranged in the crank lower cover. According to the hollow crank of the bicycle, by arranging the clamping blocks, when welding of the crank lower cover needs to be pre-fixed, the clamping blocks are arranged on the sides, close to the hollow groove, of the crank back face cover plate, the crank front face cover plate and the crank upper cover firstly, and when the crank back face cover plate, the crank front face cover plate and the crank upper cover are pressed to one side of the crank lower cover, the clamping blocks are arranged on the sides, close to the hollow groove, of the crank lower cover; the clamping block on one side makes contact with the sliding strip and extrudes the sliding strip, at the moment, the sliding strip and the sliding rod slide, the spring is compressed, the clamping block is clamped into one side of the sliding strip so that the clamping block can be fixed through the sliding strip, the crank back face cover plate, the crank front face cover plate and the crank upper cover can be pre-fixed before welding, and the device facilitates pre-fixing of welding of the crank lower cover.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle hollow cranks, and particularly relates to a bicycle hollow crank. Background Art

[0002] The bicycle crank is an important component connecting pedaling and the chainring, and often needs to be inspected and maintained.

[0003] When the existing bicycle crank is in use, due to structural and strength limitations, the crank is mostly a solid one-piece structure. Although it meets the requirements of riding, during long-term riding, the heavier crank will increase the fatigue feeling during riding and reduce the pedaling efficiency. Based on the existing technical deficiencies, the utility model designs a bicycle hollow crank. Summary of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a bicycle hollow crank, which has the characteristics of a hollow crank structure, low weight and high strength.

[0005] To achieve the above object, the utility model provides the following technical solution: a bicycle hollow crank, including a crank lower cover, a hollow groove is opened inside the crank lower cover, and a pre-fixing mechanism is arranged inside the crank lower cover;

[0006] The pre-fixing mechanism includes a clamping block, a sliding strip, a sliding rod, a connecting hole, a sliding groove, a fixing rod, a limiting disc and a spring. The clamping block is arranged inside the hollow groove, the sliding strip is arranged inside the hollow groove, a sliding rod is fixedly connected to one side of the sliding strip, a connecting hole is opened on one side of the sliding rod, a sliding groove is opened on one side of the connecting hole, a fixing rod is arranged inside the sliding groove, a limiting disc is fixedly connected to one side of the fixing rod, and a spring is movably clamped on one side of the limiting disc.

[0007] As a preferred technical solution of the bicycle hollow crank of the utility model, a crank reverse side cover plate is arranged on one side of the crank lower cover, a crank front side cover plate is arranged on one side of the crank lower cover, and a crank upper cover is arranged at the bottom of the crank lower cover.

[0008] As a preferred technical solution of the bicycle hollow crank of the utility model, the clamping block is fixedly connected to one side of the crank reverse side cover plate, and the clamping block is fixedly connected to one side of the crank front side cover plate.

[0009] As a preferred technical solution of the bicycle hollow crank of the utility model, the clamping block is fixedly connected to one side of the crank upper cover, and the sliding strip is slidably connected inside the hollow groove.

[0010] As a preferred technical solution of the hollow crank of the present utility model, the sliding rod is slidably connected inside the hollow groove, and the sliding rod is slidably connected inside the crank lower cover.

[0011] As a preferred technical solution of the hollow crank of the present utility model, the fixed rod is fixedly connected inside the crank lower cover, and the sliding rod is slidably sleeved on the outer surface of the fixed rod.

[0012] As a preferred technical solution of the hollow crank of the present utility model, the sliding rod is slidably sleeved on the outer surface of the limiting disc, and the limiting disc is slidably connected inside the sliding groove.

[0013] As a preferred technical solution of the hollow crank of the present utility model, the spring is movably sleeved on the outer surface of the fixed rod, and the spring is movably clamped inside the sliding groove.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. When the present utility model is in use, by setting the clamping block, when it is necessary to pre-fix the welding of the crank lower cover, first, clamping blocks are arranged on one side of the crank rear cover plate, the crank front cover plate, and the crank upper cover close to the hollow groove. When the crank rear cover plate, the crank front cover plate, and the crank upper cover are pressed against one side of the crank lower cover, the clamping block on one side contacts and squeezes the slide bar. At this time, the slide bar and the sliding rod slide, the spring is compressed, and the clamping block is clamped into one side of the slide bar, so that the slide bar fixes the clamping block, which is convenient for pre-fixing the crank rear cover plate, the crank front cover plate, and the crank upper cover before welding. The device is convenient for pre-fixing the welding of the crank lower cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the crank rear cover plate of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the hollow groove of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the crank front cover plate of the present utility model;

[0020] Figure 4 is an enlarged structural diagram of part A of the present utility model;

[0021] Figure 5 is a schematic structural diagram of the pre-fixing mechanism of the present utility model;

[0022] Figure 6 Schematic diagram of the crank lower cover structure of the present utility model;

[0023] Figure 7 Schematic diagram of the crank upper cover structure of the present utility model;

[0024] Figure 8 Schematic diagram of the structure of the clamping block of the present utility model.

[0025] In the figure: 1. Crank lower cover; 101. Hollow groove; 102. Crank reverse side cover plate; 103. Crank front side cover plate; 104. Crank upper cover; 4. Pre-fixing mechanism; 401. Clamping block; 402. Slide bar; 403. Slide rod; 404. Connecting hole; 405. Slide groove; 406. Fixed rod; 407. Limiting disc; 408. Spring. Specific implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figure 1-8 , the present utility model provides the following technical solutions: A bicycle hollow crank includes a crank lower cover 1, a hollow groove 101 is provided inside the crank lower cover 1, and a pre-fixing mechanism 4 is provided inside the crank lower cover 1;

[0028] A crank reverse side cover plate 102 is provided on one side of the crank lower cover 1, a crank front side cover plate 103 is provided on one side of the crank lower cover 1, and a crank upper cover 104 is provided at the bottom of the crank lower cover 1.

[0029] Please refer to Figure 2-8 , the present utility model provides the following technical solutions:

[0030] The pre-fixing mechanism 4 includes a clamping block 401, a slide bar 402, a slide rod 403, a connecting hole 404, a slide groove 405, a fixed rod 406, a limiting disc 407 and a spring 408. The clamping block 401 is arranged inside the hollow groove 101, the slide bar 402 is arranged inside the hollow groove 101, a slide rod 403 is fixedly connected to one side of the slide bar 402, a connecting hole 404 is provided on one side of the slide rod 403, a slide groove 405 is provided on one side of the connecting hole 404, a fixed rod 406 is arranged inside the slide groove 405, a limiting disc 407 is fixedly connected to one side of the fixed rod 406, and a spring 408 is movably clamped to one side of the limiting disc 407.

[0031] The clamping block 401 is fixedly connected to one side of the reverse cover plate 102 of the crank, and the clamping block 401 is fixedly connected to one side of the front cover plate 103 of the crank.

[0032] The clamping block 401 is fixedly connected to one side of the upper cover 104 of the crank, and the sliding bar 402 is slidably connected to the inside of the hollow groove 101.

[0033] The sliding rod 403 is slidably connected to the inside of the hollow groove 101, and the sliding rod 403 is slidably connected to the inside of the lower cover 1 of the crank.

[0034] The fixing rod 406 is fixedly connected to the inside of the lower cover 1 of the crank, and the sliding rod 403 is slidably sleeved on the outer surface of the fixing rod 406.

[0035] The sliding rod 403 is slidably sleeved on the outer surface of the limiting disc 407, and the limiting disc 407 is slidably connected to the inside of the sliding groove 405.

[0036] The spring 408 is movably sleeved on the outer surface of the fixing rod 406, and the spring 408 is movably clamped in the inside of the sliding groove 405.

[0037] It should be further explained that: clamping blocks 401 are provided on one side of the reverse cover plate 102 of the crank, the front cover plate 103 of the crank and the upper cover 104 of the crank close to the hollow groove 101. When the reverse cover plate 102 of the crank, the front cover plate 103 of the crank and the upper cover 104 of the crank are pressed against one side of the lower cover 1 of the crank, the clamping block 401 on one side contacts and squeezes the sliding bar 402. At this time, the sliding bar 402 and the sliding rod 403 slide, the spring 408 is compressed, and the clamping block 401 is clamped into one side of the sliding bar 402 so that the sliding bar 402 fixes the clamping block 401, which is convenient for pre-fixing the reverse cover plate 102 of the crank, the front cover plate 103 of the crank and the upper cover 104 of the crank before welding.

[0038] Working principle: When a bicycle hollow crank is in use, first, the device has two welding methods and three welding schemes. The schemes and welding methods are as follows:

[0039] Scheme 1: First, the lower cover 1 of the crank is integrally formed, and only a notch with the same size as the hollow groove 101 is opened at its reverse side. The reverse cover plate 102 of the crank connected thereto is arranged at the position of this notch. At this time, the edge part where the reverse cover plate 102 of the crank contacts the lower cover 1 of the crank can be welded by laser welding or friction stir welding.

[0040] Scheme 2: First, the lower cover 1 of the crank is integrally formed, and only a notch with the same size as the hollow groove 101 is opened at its front side. The front cover plate 103 of the crank connected thereto is arranged at the position of this notch. At this time, the edge part where the front cover plate 103 of the crank contacts the lower cover 1 of the crank can be welded by laser welding or friction stir welding.

[0041] Solution 3: First, separate the crank lower cover 1 from the crank upper cover 104. A hollow groove 101 is provided at the bottom of the crank lower cover 1, and a hollow groove 101 is also provided at the top of the crank upper cover 104. At this time, the edge parts of the crank lower cover 1 and the crank upper cover 104 in contact can be welded by laser welding or friction stir welding.

[0042] When pre-fixing the welding of the crank lower cover 1, first, a clamping block 401 is provided on one side of the crank reverse cover 102, the crank front cover 103, and the crank upper cover 104 close to the hollow groove 101. When pressing the crank reverse cover 102, the crank front cover 103, and the crank upper cover 104 to one side of the crank lower cover 1, the clamping block 401 on one side contacts and squeezes the slide bar 402. At this time, the slide bar 402 and the slide rod 403 slide, the spring 408 is compressed, and the clamping block 401 is stuck into one side of the slide bar 402, so that the slide bar 402 fixes the clamping block 401, which is convenient for pre-fixing the crank reverse cover 102, the crank front cover 103, and the crank upper cover 104 before welding. This device is convenient for pre-fixing the welding of the crank lower cover 1.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bicycle hollow crank, comprising a crank lower cover (1), characterized in that: A hollow groove (101) is provided inside the crank lower cover (1), and a pre-fixing mechanism (4) is provided inside the crank lower cover (1); A pre-fixing mechanism (4), the pre-fixing mechanism (4) comprising a clamping block (401), a sliding bar (402), a sliding rod (403), a connecting hole (404), a sliding groove (405), a fixing rod (406), a limiting plate (407) and a spring (408), the clamping block (401) being arranged inside the hollow groove (101), the sliding bar (402) being arranged inside the hollow groove (101), one side of the sliding bar (402) being fixedly connected to the sliding rod (403), one side of the sliding rod (403) being provided with a connecting hole (404), one side of the connecting hole (404) being provided with a sliding groove (405), the fixing rod (406) being arranged inside the sliding groove (405), one side of the fixing rod (406) being fixedly connected to the limiting plate (407), and one side of the limiting plate (407) being movably connected to the spring (408).

2. A bicycle hollow crank according to claim 1, characterized in that: A crank rear cover plate (102) is provided on one side of the crank lower cover (1), a crank front cover plate (103) is provided on one side of the crank lower cover (1), and a crank upper cover (104) is provided at the bottom of the crank lower cover (1).

3. The hollow bicycle crank according to claim 1, characterized in that: The clamping block (401) is fixedly connected to one side of the crank rear cover plate (102), and the clamping block (401) is fixedly connected to one side of the crank front cover plate (103).

4. The hollow bicycle crank according to claim 1, characterized in that: The clamping block (401) is fixedly connected to one side of the crank upper cover (104), and the sliding bar (402) is slidably connected to the inside of the hollow groove (101).

5. The hollow bicycle crank according to claim 1, characterized in that: The sliding rod (403) is slidably connected inside the hollow groove (101), and the sliding rod (403) is slidably connected inside the crank lower cover (1).

6. The hollow bicycle crank according to claim 1, characterized in that: The fixed rod (406) is fixedly connected to the inside of the crank lower cover (1), and the sliding rod (403) is slidably sleeved on the outer surface of the fixed rod (406).

7. The hollow bicycle crank according to claim 1, characterized in that: The sliding rod (403) is slidably sleeved on the outer surface of the limiting plate (407), and the limiting plate (407) is slidably connected to the inside of the sliding groove (405).

8. The hollow bicycle crank according to claim 1, characterized in that: The spring (408) is movably sleeved on the outer surface of the fixing rod (406), and the spring (408) is movably clamped inside the sliding groove (405).

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