Bicycle crank

Abstract

The utility model discloses a bicycle crank which comprises a first end used for being connected with a chain wheel and a second end used for being connected with a pedal, the second end is provided with an installation hole set, and the pedal is fixed by inserting a pedal rotating shaft into the installation hole set. And the mounting hole group enables the pedal rotating shaft to be provided with at least one fixing point matched with the leg length of a rider on the crank. The end portion, connected with the pedal, of the crank is designed to be of the fan-shaped fishtail-shaped structure, the fixing hole sets are arranged on the end portion, various different effective driving radiuses are achieved on one crank, and therefore a rider can replace the riding driving radius of the crank only through a standard open spanner.

Description

Technical Field

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

[0002] Figure 1 A traditional bicycle crank is shown. The end of the crank 10 cooperating with the pedal is usually a single-hole structure 30. Due to the high threshold of the original machine tool processing technology, this single-hole structure has the advantage of low manufacturing cost. With the development of metal processing technology, the disadvantages of this single-hole structure gradually emerge. First, the effective driving radius of this crank (i.e., the length between its two fixed ends) is fixed and cannot be adjusted, and only by replacing the crank can it adapt to cyclists of different heights / leg lengths.

[0003] On the other hand, since the connection part between the pedal and the crank 10 is a stress concentration point, when the pedal receives a strong impact, the connection part of its single-hole structure is prone to damage and cause the crank to be scrapped. Content of the Utility Model

[0004] In order to achieve the above object, the technical solution adopted by the utility model is:

[0005] A bicycle crank, the crank includes a first end for connecting with a chainring and a second end for connecting with a pedal. An installation hole group is arranged on the second end, and the pedal is fixed by inserting a pedal rotating shaft into the installation hole group. The installation hole group enables the pedal rotating shaft to have at least one fixed point on the crank for matching the leg length of the cyclist.

[0006] In a preferred embodiment of the utility model, a connecting shaft for fixing the crank on the chainring is further arranged on the first end.

[0007] In a preferred embodiment of the utility model, the installation hole group includes a first fixing hole, and the distance between the first fixing hole and the connecting shaft is 150 mm.

[0008] In a preferred embodiment of the utility model, the installation hole group includes a second fixing hole, and the distance between the second fixing hole and the connecting shaft is 165 mm.

[0009] In a preferred embodiment of the utility model, the installation hole group includes a third fixing hole, and the distance between the third fixing hole and the connecting shaft is 170 mm.

[0010] In a preferred embodiment of the utility model, the installation hole group includes a fourth fixing hole, and the distance between the fourth fixing hole and the connecting shaft is 155 mm.

[0011] In a preferred embodiment of the present utility model, the mounting hole group includes a fifth fixing hole, and the distance between the fifth fixing hole and the connecting shaft is 160 mm.

[0012] In a preferred embodiment of the present utility model, the mounting hole group includes a sixth fixing hole, and the distance between the sixth fixing hole and the connecting shaft is 175 mm.

[0013] In a preferred embodiment of the present utility model, the mounting hole group includes a seventh fixing hole, and the distance between the seventh fixing hole and the connecting shaft is 172.5 mm.

[0014] The beneficial effects of the present utility model are as follows:

[0015] A bicycle crank provided by the present utility model designs the end connecting the crank and the pedal into a fan-shaped fish-tail structure. By arranging a fixing hole group in this part, multiple different effective driving radii are realized on one crank, so that a rider only needs a standard open-ended wrench to change the driving radius of the crank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0017] Figure 1 It is a schematic diagram of the prior art.

[0018] Figure 2 It is a connection schematic diagram of the crank and the pedal of the present utility model.

[0019] Figure 3 It is a planar schematic diagram of the crank.

[0020] Figure 4 It is a schematic diagram when the crank is damaged.

[0021] Figure 5 It is a display legend of the corresponding relationship of the replaceable points when the fixing hole group is damaged. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. The above description is for the convenience of describing the present utility model and simplifies the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0023] As used in the specification, the singular forms "a", "the", and "said" include plural referents unless the context clearly dictates otherwise. The terms "comprising", "including", and "having" as used in the specification mean the presence of the stated features but do not preclude the presence of one or more other features.

[0024] In the specification, when an element is referred to as being "on", "fixed to", "connected to", "joined to", etc. another element, the element can be directly on, fixed to, connected to, joined to, or in contact with the other element, or intervening elements may be present. In the specification, when a feature is arranged "adjacent" to another feature, it may mean that the feature has a portion overlapping with the adjacent feature or a portion above or below the adjacent feature.

[0025] It will be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element may be referred to as a second element without departing from the teachings of the concept of the present application.

[0026] Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. However, it should be understood that the present application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all the drawings, the same reference numerals denote the same or functionally identical elements.

[0027] Figure 2 The connection schematic of the crank and the pedal is shown. The crank 10 is fixed to a chainring (not shown in the figure) through a connecting shaft 20 on the first end 10a to drive the chainring to rotate. Its second end 10b is designed in a fish-tail shape with a fan-shaped expansion, and an installation hole group 31 composed of several installation holes is arranged on the second end 10b. This hole group structure enables the second end 10b of the crank 10 to have multiple fixing holes for fixing to the pedal rotating shaft 41. Such a structure enables multiple different effective driving radii to be realized on one crank to adapt to cyclists with different leg lengths.

[0028] Figure 3Shows a specific schematic of this crank structure. In one embodiment, the mounting hole group 31 includes a first fixing hole a, a second fixing hole b, a third fixing hole c, a fourth fixing hole d, a fifth fixing hole e, a sixth fixing hole f, and a seventh fixing hole g. Among them, the distance from the first fixing hole a to the connecting shaft 20 is 150 mm, the distance from the second fixing hole b to the connecting shaft 20 is 165 mm, the distance from the third fixing hole c to the connecting shaft 20 is 170 mm, the distance from the fourth fixing hole d to the connecting shaft 20 is 155 mm, the distance from the fifth fixing hole e to the connecting shaft 20 is 160 mm, the distance from the sixth fixing hole f to the connecting shaft 20 is 175 mm, and the distance from the seventh fixing hole g to the connecting shaft 20 is 172.5 mm. The lengths of these 7 effective driving radii basically cover the common specifications of adult bicycle cranks, enabling riders to select the fixing holes suitable for their own leg lengths to achieve the best riding experience.

[0029] The first fixing hole a, the second fixing hole b, the third fixing hole c, the fourth fixing hole d, the fifth fixing hole e, the sixth fixing hole f, and the seventh fixing hole g are arranged in a honeycomb pattern as a whole. This arrangement enables, when a certain fixing hole is damaged during riding due to a strong impact on the pedal 40 (such as hitting a rock during off-road riding), the adjacent hole positions to deform and absorb energy to prevent the second end 10b of the entire crank 10 from being damaged, so that by replacing it with other fixing hole positions, it can ensure that riders can complete the entire journey, especially during off-road riding.

[0030] Combined Figure 4 and Figure 5 It can be seen that when any one of the first fixing hole a, the second fixing hole b, the third fixing hole c, the fourth fixing hole d, the fifth fixing hole e, the sixth fixing hole f, and the seventh fixing hole g becomes a damaged point, energy absorption is implemented through the adjacent possible damaged points to ensure that there are still some usable points for replacement riding.

Claims

1. A bicycle crank, the crank comprising a first end for connecting with a chainring and a second end for connecting with a pedal, characterized in that, An installation hole group is provided on the second end, and the pedal is fixed by inserting a pedal rotating shaft into the installation hole group. The installation hole group enables the pedal rotating shaft to have at least one fixed point on the crank for matching the leg length of the rider.

2. A bicycle crank according to claim 1, wherein, It further includes a connecting shaft provided on the first end for fixing the crank to the chainring.

3. A bicycle crank according to claim 2, wherein, The installation hole group includes a first fixing hole, and the distance between the first fixing hole and the connecting shaft is 150 mm.

4. A bicycle crank according to claim 2, wherein, The installation hole group includes a second fixing hole, and the distance between the second fixing hole and the connecting shaft is 165 mm.

5. A bicycle crank according to claim 2, wherein, The installation hole group includes a third fixing hole, and the distance between the third fixing hole and the connecting shaft is 170 mm.

6. A bicycle crank according to claim 2, characterized in that, The installation hole group includes a fourth fixing hole, and the distance between the fourth fixing hole and the connecting shaft is 155 mm.

7. A bicycle crank according to claim 2, wherein, The installation hole group includes a fifth fixing hole, and the distance between the fifth fixing hole and the connecting shaft is 160 mm.

8. A bicycle crank according to claim 2, characterized in that, The installation hole group includes a sixth fixing hole, and the distance between the sixth fixing hole and the connecting shaft is 175 mm.

9. A bicycle crank according to claim 2, wherein, The installation hole group includes a seventh fixing hole, and the distance between the seventh fixing hole and the connecting shaft is 172.5 mm.

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