Chain wheel crank with hollow structure

Abstract

The utility model discloses a chain wheel crank with a hollow structure, which comprises a left crank, one side of the left crank is fixedly connected with a fixing disc, the periphery of the surface of the fixing disc is fixedly connected with fixing blocks, the inside of each fixing block is slidably connected with an extending mechanism, one side of the fixing disc is fixedly connected with a crank connecting rod, and the crank connecting rod is fixedly connected with a connecting rod. And a plastic positioning block is inserted into the tail end of the crank connecting rod. According to the crankset crank with the hollow structure, through the arrangement of the supporting mechanism, when equipment is used, due to the fact that cavities are formed in the left crank and the right crank, a plurality of transverse supporting rods and longitudinal supporting rods are arranged in the cavities, and the transverse supporting rods and the longitudinal supporting rods are connected in a crossed mode to form a net-shaped structure; the internal structural strength of the left crank and the right crank is greatly improved, and the situation that when the left crank and the right crank are subjected to overlarge external force, the left crank and the right crank are broken, and normal use of equipment is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a chainring crank with a hollow structure. Background Art

[0002] The hollow structure of the chainring crank is a part of the bicycle. It is used to install the chainring and chain for pedaling and plays a transmission role. It is widely used in various bicycles. With the popularization of cycling culture, people's demand for the use of hollow structure chainring cranks is gradually increasing.

[0003] When the existing hollow-structured crankset is in use, the crankset is easily broken due to the hollow interior and lack of supporting structure, which affects the normal use of the equipment. Therefore, a crankset with a hollow structure is proposed.

[0004] A hollow-structured crankset crank disclosed in announcement number CN212386630U includes a central axis connecting rod, a right crankset rod being fixedly mounted on the outer surface of one end of the central axis connecting rod, a left crankset rod being fixedly mounted on the outer surface of the other end of the central axis connecting rod, pedal mounting holes being provided on the inner sides of the right crankset rod and the left crankset rod, hollow inner grooves being provided on the inner surfaces of the right crankset rod and the left crankset rod, multiple hollow reinforcing ribs being provided on the inner surfaces of the right crankset rod and the left crankset rod, and a crankset fixing claw being fixedly mounted on the outer surface of one side of the right crankset rod. The hollow-structured crankset crank disclosed in the utility model can reduce the weight of the crankset by means of the hollow structure while ensuring the hardness and strength of the crankset, thereby improving the overall performance of the crankset, supporting the four claws of the crankset fixing claw, ensuring the strength of the four claws, and preventing breakage when the crankset is pedaled.

[0005] Although the above patent is able to reduce the weight of the crank through the hollow structure while ensuring the hardness and strength of the crank, thereby improving the overall performance of the crank, and can support the four claws of the chainring fixing claws, thereby ensuring the strength of the four claws and preventing breakage when stepping on the chainring; however, when the device is installing the crank and the chainring fixing claws, it is not easy to adjust the length of the chainring fixing claws to adapt to chainring positioning rings of different apertures and improve the practicality of the equipment.

[0006] Therefore, it is necessary to invent a toothed crank with a hollow structure to solve the above problems. Utility Model Content

[0007] The technical problems to be solved by the present invention are as follows: to provide a crankset with a hollow structure which is highly practical, can be easily operated and has a relatively simple structure, thereby solving the problem raised in the above-mentioned background technology that the crankset is easily broken due to the hollow interior and lack of a supporting structure, thereby affecting the normal use of the equipment.

[0008] The purpose of the utility model can be achieved through the following technical solutions:

[0009] A chainring crank with a hollow structure includes a left crank, one side of the left crank is fixedly connected to a fixed plate, the surface of the fixed plate is fixedly connected to a fixed block around, the interior of the fixed block is slidably connected to an extension mechanism, one side of the fixed plate is fixedly connected to a crank connecting rod, the end of the crank connecting rod is inserted with a plastic positioning block, the top of the plastic positioning block is fixedly connected to the right crank, the interior of the left crank and the right crank are both provided with a cavity, the interior of the cavity is fixedly connected to a supporting mechanism, the extending mechanism includes a telescopic positioning claw slidably connected to the interior of the fixed block, the surface of the telescopic positioning claw is provided with a plurality of threaded holes, the internal thread of one of the threaded holes is connected to a threaded column; the supporting mechanism includes a plurality of transverse support rods fixedly connected to the interior of the cavity, and the surface of the transverse support rod is fixedly connected to the longitudinal support rod.

[0010] As a further solution of the present invention: the transverse support rod and the longitudinal support rod are cross-connected, and the material of the transverse support rod and the longitudinal support rod is stainless steel, and the support rod facilitates improving the internal strength of the crank.

[0011] As a further solution of the present invention: the surface of the telescopic positioning claw is slidably connected with a claw plate, and the surface of the claw plate is provided with a threaded hole adapted to the threaded column, so that the claw plate is convenient for connecting the telescopic positioning claw.

[0012] As a further solution of the present invention: a friction pad is fixedly connected to the interior of the plastic positioning block, and the friction pad is sleeved on the end of the crank connecting rod, so that the friction pad can easily fix the crank connecting rod.

[0013] As a further solution of the present invention: two threaded holes are fixedly provided on the bottom of the plastic positioning block, and the internal threads of the threaded holes are connected with fastening screws, which facilitate the adjustment of the internal aperture size of the plastic positioning block.

[0014] As a further solution of the present invention: a positioning ring is fixedly connected to one side of the claw disc, and a plurality of chain grooves are opened on the surface of the positioning ring, so that the positioning ring is convenient for supporting the external chain.

[0015] As a further solution of the present invention: pedal positioning holes are provided on the surfaces of the left crank and the right crank, and the pedal positioning holes are threadedly connected to the external pedals, so that the pedal positioning holes are convenient for connecting to the external pedals.

[0016] Beneficial effects of the utility model:

[0017] 1. Through the setting of the supporting mechanism, when the equipment is used, since there are cavities inside the left crank and the right crank, a number of transverse support rods and longitudinal support rods are provided inside the cavity, and the transverse support rods and the longitudinal support rods are cross-connected to form a network structure, which greatly improves the structural strength of the left crank and the right crank, and prevents the left crank and the right crank from breaking when they are subjected to excessive external force, thereby affecting the normal use of the equipment.

[0018] 2. Through the setting of the extension mechanism, when installing the crank, the length of the telescopic positioning claw can be adjusted according to the aperture of the positioning ring, so that the telescopic positioning claw can be inserted into the claw disk on the surface of the positioning ring, so as to adapt to positioning rings of different apertures for installation. Finally, the threaded column is inserted into the claw disk and the telescopic positioning claw to achieve positioning, which can make the installation process of the crank more flexible and more compatible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the extension mechanism structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the crank connecting rod structure of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the support mechanism of the utility model.

[0024] In the figure: 1. Left crank; 2. Fixed plate; 3. Fixed block; 4. Extension mechanism; 401. Telescopic positioning claw; 402. Threaded column; 5. Crank connecting rod; 6. Plastic positioning block; 7. Right crank; 8. Support mechanism; 801. Horizontal support rod; 802. Longitudinal support rod; 9. Claw plate; 10. Friction pad; 11. Fastening screw; 12. Positioning ring. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1-4 As shown, a toothed crank with a hollow structure comprises a left crank 1, one side of the left crank 1 is fixedly connected to a fixed plate 2, the surface of the fixed plate 2 is fixedly connected to a fixed block 3, the interior of the fixed block 3 is slidably connected to an extension mechanism 4, through the setting of the extension mechanism 4, when the crank is installed, the length of the telescopic positioning claw 401 can be adjusted according to the aperture of the positioning ring 12, so that the telescopic positioning claw 401 can be inserted into the claw plate 9 on the surface of the positioning ring 12, so as to adapt to positioning rings 12 of different apertures for installation, and finally the threaded column 402 is inserted into the claw plate 9 and the telescopic positioning claw 401 to achieve positioning, which can make the installation process of the crank more flexible and more compatible, one side of the fixed plate 2 is fixedly connected to a crank connecting rod 5, the end of the crank connecting rod 5 is inserted with a plastic positioning block 6, the top of the plastic positioning block 6 is fixedly connected to the right crank 7, and the interior of the left crank 1 and the right crank 7 are both provided with a cavity, the interior of the cavity It is fixedly connected with a supporting mechanism 8. Through the setting of the supporting mechanism 8, when the device is used, since a cavity is provided inside the left crank 1 and the right crank 7, a plurality of transverse supporting rods 801 and longitudinal supporting rods 802 are provided inside the cavity, and the transverse supporting rods 801 and the longitudinal supporting rods 802 are cross-connected to form a mesh structure, which greatly improves the structural strength inside the left crank 1 and the right crank 7, and avoids the left crank 1 and the right crank 7 from breaking when the left crank 1 and the right crank 7 are subjected to excessive external force, affecting the normal use of the device. The extending mechanism 4 includes a telescopic positioning claw 401 slidably connected to the inside of the fixed block 3, and a plurality of threaded holes are provided on the surface of the telescopic positioning claw 401, and a threaded column 402 is internally threadedly connected to one of the threaded holes; the supporting mechanism 8 includes a plurality of transverse supporting rods 801 fixedly connected to the inside of the cavity, and the surface of the transverse supporting rod 801 is fixedly connected to the longitudinal supporting rod 802;

[0027] like Figure 4 As shown, the transverse support rod 801 and the longitudinal support rod 802 are cross-connected. The transverse support rod 801 and the longitudinal support rod 802 are made of stainless steel. The support rods are convenient for improving the internal strength of the crank;

[0028] like Figure 2 As shown, the surface of the telescopic positioning claw 401 is slidably connected to the claw plate 9, and the surface of the claw plate 9 is provided with a threaded hole adapted to the threaded column 402, so that the claw plate 9 is convenient for connecting the telescopic positioning claw 401;

[0029] like Figure 4 As shown, a friction pad 10 is fixedly connected to the interior of the plastic positioning block 6. The friction pad 10 is sleeved on the end of the crank connecting rod 5. The friction pad 10 facilitates fixing the crank connecting rod 5.

[0030] like Figure 4 As shown, the bottom of the plastic positioning block 6 is fixed with two threaded holes, and the internal threads of the threaded holes are connected with fastening screws 11, which facilitate the adjustment of the internal aperture size of the plastic positioning block 6;

[0031] like Figure 1 As shown, a positioning ring 12 is fixedly connected to one side of the claw plate 9, and a plurality of chain grooves are opened on the surface of the positioning ring 12 to facilitate supporting the external chain;

[0032] like Figure 1 As shown, the surfaces of the left crank 1 and the right crank 7 are both provided with pedal positioning holes, which are threadedly connected to the external pedals. The pedal positioning holes are convenient for connecting to the external pedals.

[0033] Working principle of the present invention: When the device is in use, since the left crank 1 and the right crank 7 are both provided with cavities, a plurality of transverse support rods 801 and longitudinal support rods 802 are provided inside the cavities, and the transverse support rods 801 and the longitudinal support rods 802 are cross-connected to form a mesh structure, which greatly improves the structural strength of the left crank 1 and the right crank 7;

[0034] When installing the crank, the length of the telescopic positioning claw 401 can be adjusted according to the aperture of the positioning ring 12, so that the telescopic positioning claw 401 can be inserted into the claw plate 9 on the surface of the positioning ring 12, so as to adapt to the positioning rings 12 with different apertures for installation, and finally the threaded column 402 is inserted into the claw plate 9 and the telescopic positioning claw 401 to achieve positioning.

[0035] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A crankset crank with a hollow structure, comprising a left crank (1), characterized in that: One side of the left crank (1) is fixedly connected to a fixed plate (2), the surface of the fixed plate (2) is fixedly connected to a fixed block (3), the interior of the fixed block (3) is slidably connected to an extension mechanism (4), one side of the fixed plate (2) is fixedly connected to a crank connecting rod (5), the end of the crank connecting rod (5) is plugged with a plastic positioning block (6), the top of the plastic positioning block (6) is fixedly connected to a right crank (7), the interior of the left crank (1) and the right crank (7) are both provided with a cavity, the interior of the cavity is fixedly connected to a support mechanism (8), The extension mechanism (4) comprises a telescopic positioning claw (401) slidably connected to the interior of the fixed block (3); a plurality of threaded holes are provided on the surface of the telescopic positioning claw (401); a threaded column (402) is internally threadedly connected to one of the threaded holes; The support mechanism (8) comprises a plurality of transverse support rods (801) fixedly connected to the interior of the cavity, and longitudinal support rods (802) are fixedly connected to the surfaces of the transverse support rods (801).

2. The chainring crank with a hollow structure according to claim 1, characterized in that: The transverse support rod (801) and the longitudinal support rod (802) are cross-connected, and the transverse support rod (801) and the longitudinal support rod (802) are made of stainless steel.

3. The chainring crank with a hollow structure according to claim 1, characterized in that: The surface of the telescopic positioning claw (401) is slidably connected to a claw plate (9), and the surface of the claw plate (9) is provided with a threaded hole adapted to the threaded column (402).

4. The chainring crank with a hollow structure according to claim 1, characterized in that: A friction pad (10) is fixedly connected to the interior of the plastic positioning block (6), and the friction pad (10) is sleeved on the end of the crank connecting rod (5).

5. The chainring crank with a hollow structure according to claim 1, characterized in that: The bottom of the plastic positioning block (6) is fixedly provided with two threaded holes, and the internal threads of the threaded holes are connected with fastening screws (11).

6. The chainring crank with a hollow structure according to claim 3, characterized in that: A positioning ring (12) is fixedly connected to one side of the claw plate (9), and a plurality of chain grooves are provided on the surface of the positioning ring (12).

7. The chainring crank with a hollow structure according to claim 1, characterized in that: The surfaces of the left crank (1) and the right crank (7) are both provided with pedal positioning holes, and the pedal positioning holes are threadedly connected to the external pedals.

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