Bicycle chain wheel crank with anti-deformation structure

Abstract

The utility model relates to the technical field of bicycle chain wheel cranks, and discloses a bicycle chain wheel crank with an anti-deformation structure, which comprises a chain wheel main body, crank main bodies are fixedly arranged on the front side and the rear side of the chain wheel main body, and external supporting devices are arranged on the surfaces of the crank main bodies. Firstly, the strip reinforcing rib is connected to the surface of the crank main body in a sleeving mode, it is ensured that the clamping piece on the rear side of the strip reinforcing rib is tightly attached to the surface of the rear side of the crank main body, tight joint is achieved, the crank is further protected through the buffer springs, the first fixing bolts are screwed in the threaded holes in the two sides, and the first fixing bolts are screwed in the threaded holes in the two sides; according to the crank provided by the utility model, the situation that the bolt is loosened or even falls off due to factors such as vibration and friction in the long-time use process can be effectively avoided, the long-strip reinforcing ribs endow the crank main body with the bending deformation resisting capacity in the length direction, the force is uniformly dispersed to the whole length direction, and the situation that the crank main body is bent in the direction is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle sprocket crank technical field, especially a bicycle sprocket crank with anti-deformation structure. BACKGROUND

[0002] As a traditional means of transportation, bicycles play an important role in urban travel. Bicycle sprocket crank is one of the important accessories of bicycle. One end of the bicycle sprocket crank is connected by pedals, and the other end is connected to the pedals and gears of the bicycle wheel to transmit the pedaling force of the rider and make the bicycle move forward. However, the bicycle sprocket crank is often affected by various factors during use, such as external impact, friction and corrosion, which causes changes in its shape and size, thereby affecting the performance and service life of the bicycle.

[0003] The applicant found that a bicycle sprocket crank with anti-deformation structure has been disclosed in Chinese patent with publication (announcement) number CN221623890U. The patent mainly includes a sprocket, a protective sleeve and a connecting buckle. The outer wall of the sprocket is installed with a crank, and the outer wall of the crank is installed with a protective sleeve. The protective sleeve can be easily fixed on the crank by pulling the pull block. The pull block drives the fixing block and the clamping block to tightly clamp the protective sleeve, solving the problem of the protective sleeve not being easy to disassemble in the prior art. However, the above-mentioned prior art may have defects by sleeving a protective sleeve on the surface of the crank to prevent deformation. The installation of the protective sleeve requires high requirements, and the protective sleeve may not completely fit the surface of the crank due to improper installation or long-term use, which may form a gap between the two. During cycling, when the crank is subjected to external force, the gap may cause local stress concentration. Therefore, the present invention provides a bicycle sprocket crank with anti-deformation structure. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a bicycle sprocket crank with anti-deformation structure to solve the problem of the above-mentioned prior art in the background art. The protective sleeve may not completely fit the surface of the crank due to improper installation or long-term use, which may form a gap between the two. During cycling, when the crank is subjected to external force, the gap may cause local stress concentration. Therefore, the present invention provides a bicycle sprocket crank with anti-deformation structure.

[0005] To achieve the above object, the utility model provides the following technical scheme: A bicycle sprocket crank with deformation prevention structure, including sprocket main part, the front and back two sides fixed mounting of sprocket main part has crank main body, the surface of crank main body is equipped with external support device, the sprocket main part with crank main body is equipped with steady device, external support device includes long strip reinforcing rib, long strip reinforcing rib is connected with first fixed bolt through screw hole, the front side of long strip reinforcing rib is equipped with notch, the front side of long strip reinforcing rib and the both sides upper and lower ends of notch are all fixedly installed with the clamping piece of notch, long strip reinforcing rib's inner wall is fixedly installed with a plurality of distance distribution's buffer spring.

[0006] As a preferred scheme, the long strip reinforcing rib is sleeved on the surface of the crank main body, the screw holes are provided with two groups and are opened through the rear ends of the long strip reinforcing rib, and the first fixed bolts are provided with two groups and are respectively threadedly connected to the interiors of the two groups of screw holes.

[0007] As a preferred scheme, the buffer springs of the plurality of groups are fixedly installed at the one end of the inner wall of the long strip reinforcing rib away from the crank main body, and the sprocket main part passes through the notch and does not contact the long strip reinforcing rib.

[0008] As a preferred scheme, the steady device includes a radial reinforcing rib, a plurality of semi-axes in a circumferential array are fixedly installed in the interior of the sprocket main part, the radial reinforcing rib is arranged in an inverted triangle, and the radial reinforcing rib is provided with three groups.

[0009] As a preferred scheme, the radial reinforcing ribs of the three groups are arranged in a circumferential array, and the one end of the radial reinforcing rib of the three groups is fixedly installed on the circumferential surface of the crank main body, and the surfaces of the semi-axes and the radial reinforcing rib are respectively provided with a first mounting hole and a second mounting hole.

[0010] As a preferred scheme, the first mounting hole and the second mounting hole are provided with a second fixed bolt in the interior.

[0011] The utility model discloses technical effect and advantage:

[0012] 1. By setting the external support device, first, the long reinforcing bar sleeve is connected to the surface of the crank main body, ensuring that the clamping piece on the back side is tightly attached to the back surface of the crank main body, and the long reinforcing bar is tightly attached to the surface of the crank main body. A plurality of buffer springs are accurately fixed on the surface of the crank main body, which can effectively absorb and buffer part of the energy when the crank is impacted by external force, further protecting the crank. The first fixing bolt is tightened in the threaded hole on both sides, which can effectively avoid the situation that the bolt is loose or even falls off due to factors such as vibration and friction during long-term use. The long reinforcing bar gives the crank main body the ability to resist bending deformation in the length direction, and evenly disperses these forces to the entire length direction, preventing the crank main body from bending in this direction.

[0013] By setting the stable device, a plurality of radial reinforcing bars are installed at the end of the crank main body connected with the sprocket main body, and the radial reinforcing bars are fixed on the crank main body by the second fixing bolt. At the same time, the radial reinforcing bars and the half shaft are further reinforced by the firm fixing block to form a stable and tight connection structure. The connection part of the crank main body and the sprocket main body is a key area with high stress concentration in the entire structure. These radial reinforcing bars extend radially and orderly around the connection center point. This unique design is like a precise energy dispersion network, which can efficiently disperse the torque transmitted by the sprocket main body to the surrounding crank main body structure. In this way, the deformation problem caused by excessive local stress concentration can be effectively avoided, and the stability and reliability of the entire structure under complex stress conditions are greatly enhanced, ensuring the smooth operation of the bicycle transmission system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional structure schematic diagram of the utility model.

[0015] Figure 2 It is a front view cross-sectional structure schematic diagram of the utility model.

[0016] Figure 3 It is a top view cross-sectional structure schematic diagram of the utility model.

[0017] Figure 4 It is an external support device structure schematic diagram of the utility model.

[0018] Figure 5 It is a stable device structure schematic diagram of the utility model.

[0019] In the figure: 1, sprocket main body; 2, crank main body; 3, external support device; 4, stabilizing device; 301, long reinforcing rib; 302, clamping piece; 303, buffer spring; 304, threaded hole; 305, first fixing bolt; 306, notch; 401, radial reinforcing rib; 402, half shaft; 403, first mounting hole; 404, second mounting hole; 405, fixing block; 406, second fixing bolt. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Embodiment one:

[0022] Please refer to the drawings Figure 1 - the drawings Figure 4 A bicycle sprocket crank with a deformation prevention structure, comprising a sprocket main body 1, a crank main body 2 is fixedly installed on the front and rear sides of the sprocket main body 1, an external support device 3 is arranged on the surface of the crank main body 2, a stabilizing device 4 is arranged between the sprocket main body 1 and the crank main body 2, the external support device 3 comprises a long reinforcing rib 301, the long reinforcing rib 301 is connected with a first fixing bolt 305 through a threaded hole 304, a notch 306 is formed on the front side of the long reinforcing rib 301, clamping pieces 302 are fixedly installed on the upper and lower ends of the front side of the long reinforcing rib 301 and located on both sides of the notch 306, a plurality of buffer springs 303 are fixedly installed on the inner wall of the long reinforcing rib 301 and are distributed at equal distances, the long reinforcing rib 301 is sleeved on the surface of the crank main body 2, the threaded hole 304 is provided with two groups and is formed on the rear side of the long reinforcing rib 301, the first fixing bolt 305 is provided with two groups and is threadedly connected to the inside of the two groups of threaded holes 304, the buffer springs 303 away from the inner wall of the long reinforcing rib 301 are fixedly installed on the side surface of the crank main body 2, and the sprocket main body 1 passes through the notch 306 and does not contact the long reinforcing rib 301.

[0023] The long reinforcing rib 301 has a certain bending property, and can be forced to be removed from the surface of the crank main body 2, similar to a kind of elastic sheet, has the effect of dispersion force, and the weight of the long reinforcing rib 301 itself is not too large, so that the speed and efficiency of riding are not affected by the additional weight. When the crank is subjected to lateral bending force, the long reinforcing rib 301 will deform with the bending of the crank main body 2. This deformation causes the long reinforcing rib 301 to generate stress resisting deformation inside. According to the stress-strain relationship, the long reinforcing rib 301 can distribute the force along its length direction and its cross section. The buffer spring 303 has a certain buffering effect. The buffer spring 303 is arranged to avoid deformation of the crank main body 2 when it is impacted by external lateral force. The threaded hole 304 is provided in the long reinforcing rib 301, which does not affect the overall strength of the crank main body 2.

[0024] Specifically, first, the long reinforcing rib 301 is sleeved on the surface of the crank main body 2, so that the rear clamping piece 302 is completely fitted with the rear surface of the crank main body 2. At this time, the buffer springs 303 are fixed on the surface of the crank main body 2 by welding. Then, the first fixing bolt 305 is tightened in the threaded hole 304 on both sides of the long reinforcing rib 301, so that the long reinforcing rib 301 is stably fixed on the surface of the crank main body 2. The long reinforcing rib 301 is like several edges added to the side of an elongated rod, which can enhance the ability of the crank main body 2 to resist bending deformation in the length direction. When the pedaling force acts on the crank main body 2, the long reinforcing rib 301 can disperse the force to the entire length direction, preventing the crank main body 2 from excessive bending in this direction. The fixing mode of the first fixing bolt 305 avoids the situation that it falls off after a long time of use.

[0025] Example two:

[0026] Please refer to the accompanying Figure 1 - accompanying Figure 3 and accompanying Figure 5 , and on the basis of example one, it is further obtained that the stabilizing device 4 comprises a radial reinforcing rib 401, and a plurality of half shafts 402 are fixedly installed inside the chain wheel main body 1 in a circumferential array. The radial reinforcing rib 401 is arranged in an inverted triangular shape, and three groups of radial reinforcing ribs 401 are arranged in a circumferential array. One end of each group of radial reinforcing ribs 401 is fixedly installed on the circumferential surface of the crank main body 2. The surface of the half shaft 402 and the radial reinforcing rib 401 is respectively provided with a first installation hole 403 and a second installation hole 404. A fixed block 405 is fixedly installed between the rear surface of the end of the radial reinforcing rib 401 away from the crank main body 2 and the half shaft 402. The first installation hole 403 and the second installation hole 404 are provided with a second fixing bolt 406.

[0027] The radial reinforcing ribs 401 in triangular shape are arranged at the connecting position of the crank body 2 and the sprocket body 1, and can effectively resist the bending deformation when the crank body 2 is subjected to the upward bending force, because the triangular structure can well decompose the force to each side when subjected to the pressure, thereby enhancing the bending resistance of the whole.

[0028] Specifically, the radial reinforcing ribs 401 are arranged at the connecting position of the crank body 2 and the sprocket body 1, and are fixed by the second fixing bolts 406, and the radial reinforcing ribs 401 and the half shaft 402 are fixed by the fixing blocks 405, the connecting position of the crank body 2 and the sprocket body 1 is a key area with relatively concentrated stress, the radial reinforcing ribs 401 extend radially from the connecting center point to the periphery, and this design can effectively disperse the torque transmitted from the sprocket body 1 to the surrounding structure of the crank body 2, and prevent the deformation caused by excessive local stress.

[0029] The utility model discloses a bicycle sprocket crank with anti-deformation structure, first, the long reinforcing rib 301 is sleeved on the surface of the crank body 2, and the rear clamping piece 302 is completely attached to the rear surface of the crank body 2, at this time, the plurality of buffer springs 303 are fixed on the surface of the crank body 2 by welding, then, the first fixing bolt 305 is screwed in the screw hole 304 on the both sides of the long reinforcing rib 301, and the long reinforcing rib 301 is stably fixed on the surface of the crank body 2, the long reinforcing rib 301 is like adding several edges to the side of an elongated rod, which can enhance the bending resistance of the crank body 2 in the length direction, when the pedaling force acts on the crank body 2, the long reinforcing rib 301 can disperse the force to the whole length direction, preventing the crank body 2 from being excessively bent in this direction, the radial reinforcing ribs 401 are arranged at the connecting position of the crank body 2 and the sprocket body 1, and are fixed by the second fixing bolts 406, and the radial reinforcing ribs 401 and the half shaft 402 are fixed by the fixing blocks 405, the connecting position of the crank body 2 and the sprocket body 1 is a key area with relatively concentrated stress, the radial reinforcing ribs 401 extend radially from the connecting center point to the periphery, and this design can effectively disperse the torque transmitted from the sprocket body 1 to the surrounding structure of the crank body 2, and prevent the deformation caused by excessive local stress, the combination of the two devices improves the anti-deformation effect of the crank body 2, and the whole process is completed.

[0030] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, the made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A bicycle sprocket crank with deformation prevention structure comprising a sprocket body (1), characterized in that: The chain wheel body (1) is fixedly installed with crank body (2) on both sides, the surface of crank body (2) is provided with external support device (3), the chain wheel body (1) and crank body (2) are provided with stable device (4), the external support device (3) includes long strip reinforcing rib (301), the long strip reinforcing rib (301) is connected with first fixed bolt (305) through threaded hole (304), the front side of long strip reinforcing rib (301) is provided with notch (306), the front side of long strip reinforcing rib (301) and the upper and lower ends on both sides of notch (306) are fixedly installed with clamping piece (302), the inner wall of long strip reinforcing rib (301) is fixedly installed with multiple buffering springs (303) distributed at equal distances.

2. A bicycle chainset sprocket with deformation prevention structure according to claim 1, characterized in that: The long strip reinforcing rib (301) is sleeved on the surface of the crank body (2), the threaded hole (304) is provided with two groups and is opened through the rear ends of the long strip reinforcing rib (301), and the first fixed bolt (305) is provided with two groups and is respectively screwed in the inner part of the two groups of threaded holes (304).

3. The bicycle chainset sprocket with deformation prevention structure according to claim 1, characterized in that: Multiple buffering springs (303) are fixedly installed on the side surface of the crank body (2) away from the inner wall of the long strip reinforcing rib (301), and the chain wheel body (1) passes through the notch (306) and does not contact the long strip reinforcing rib (301).

4. The bicycle chainset sprocket with deformation prevention structure according to claim 1, characterized in that: The stable device (4) includes radial reinforcing rib (401), the inside of the chain wheel body (1) is fixedly installed with multiple semi-axes (402) distributed in a circumferential array, the radial reinforcing rib (401) is arranged in an inverted triangle, and the radial reinforcing rib (401) is provided with three groups.

5. A bicycle chainset sprocket with deformation prevention structure according to claim 4, characterized in that: Three groups of radial reinforcing ribs (401) are distributed in a circumferential array, and one end of the three groups of radial reinforcing ribs (401) is fixedly installed on the circumferential surface of the crank body (2), and the surfaces of the semi-axes (402) and the radial reinforcing ribs (401) are respectively provided with first mounting holes (403) and second mounting holes (404).

6. A bicycle chainset sprocket with deformation prevention structure according to claim 5, characterized in that: The end of the radial reinforcing rib (401) away from the crank body (2) is fixedly installed with a fixed block (405) between the rear surface of the semi-axes (402), and the inside of the first mounting hole (403) and the second mounting hole (404) is provided with a second fixed bolt (406).

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