A crank assembly for a bicycle

Abstract

The utility model relates to a crank assembly for bicycle belongs to the technical field of the crank for bicycle, specifically relates to a crank assembly for bicycle, including crank body, the crank body includes first connecting head and second connecting head, the inside of first connecting head is provided with protection mechanism, the utility model discloses the crank body is inserted with the middle axle of bicycle through connecting groove, then is fixed with hexagon screw tightly, after that, the protection cover is inserted with the placement hole, when inserting, two clamping plates are guided to the inside through the arc surface of bottom, and deform inward, after complete insertion, the clamping plate is spring back and is connected in the inside of the clamping groove, rectangular lug sliding insertion is in the inside of corresponding rectangular recess at this moment, thereby limit fixed protection cover, prevent the protection cover from rotating, and the end insertion of hexagon screw is in the anti-rotation groove of protection cover inside, and the anti-rotation groove is set up as hexagonal, the setting of anti-rotation groove can prevent hexagon screw from self-rotating loose, guarantee that the crank body is connected with the stability of the middle axle of bicycle.

Description

Technical Field

[0001] This utility model relates to the field of bicycle crank technology, specifically a bicycle crank assembly. Background Technology

[0002] The crank is a component that is connected to the frame by a revolute joint and can rotate a full circle around the axis of the revolute joint. In a bicycle, it plays a key role in converting the rider's pedaling force into the power to drive the wheels to rotate.

[0003] The existing crankshaft is usually fixed with hex screws, and then a clip end cap is installed at the mounting hole. However, the hex screws used for installation can only protect the crankshaft and cannot prevent it from loosening during riding. In fact, the crankshaft may even fall off due to the loose hex screws, affecting riding safety.

[0004] Therefore, a crank assembly for bicycles is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a crank assembly for bicycles. It solves the problem that existing cranks are typically installed and fixed with hexagonal screws, followed by the installation of clip end caps at the mounting holes. However, this only protects the hexagonal screws and cannot prevent them from loosening during riding. In some cases, the crank may even fall off due to loose hexagonal screws, affecting riding safety.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a crank body, the crank body comprising a first connector and a second connector, a protective mechanism provided on the inner side of the first connector, the protective mechanism comprising a connecting groove and a protective cover, the connecting groove being opened on one side of the first connector, a placement hole being opened at one end of the connecting groove, the protective cover being disposed inside the placement hole, a snap-fit ​​mechanism being provided at the connection between the protective cover and the placement hole, and an installation mechanism being provided on the inner side of the second connector.

[0007] Preferably, the locking mechanism includes a locking groove, a rectangular groove, a rectangular protrusion, a locking plate, a circular groove, an anti-rotation groove, and a deformation groove. The locking groove is formed inside the placement hole, the rectangular groove is formed inside the placement hole, the rectangular protrusion is integrally formed and connected to the outside of the protective cover, the locking plate is integrally formed and connected to the bottom of the protective cover, the circular groove is located at the bottom of the protective cover, the anti-rotation groove is formed inside the protective cover, there are two locking plates, and the deformation groove is located between two adjacent locking plates.

[0008] Preferably, the card plate is snapped into the inner side of the card slot, and the bottom corner of the card plate is set with an arc surface, and the card plate has an arc-shaped structure.

[0009] Preferably, the rectangular grooves are equidistantly distributed on the inner wall of the placement hole, and the rectangular protrusions are equidistantly distributed on the outer wall of the protective cover.

[0010] Preferably, the protective cover is slidably inserted into the placement hole via a rectangular groove and a rectangular protrusion, wherein the inner wall of the rectangular groove fits against the outer wall of the rectangular protrusion.

[0011] Preferably, the mounting mechanism includes a fixing groove, a connecting seat, an internal threaded hole, a through hole, and a bolt. The fixing groove is located on the outer side of the second connector, the connecting seat is slidably inserted into the inner side of the fixing groove, the internal threaded hole is located through the inner side of the connecting seat, the through hole is located on the outer side of the second connector, and the bolt is inserted through the through hole.

[0012] Preferably, the inner wall of the fixing groove fits against the outer wall of the connecting seat, and the connecting seat has a rectangular structure.

[0013] Compared with the prior art, the present invention provides a crank assembly for bicycles, which has the following advantages: The crank body is inserted into the bicycle's bottom bracket via a connecting slot and then tightened with a hexagonal screw. Next, the protective cover is inserted into the mounting hole. During insertion, two retaining plates are guided inwards by the curved surface at the bottom. After full insertion, the retaining plates spring back and engage with the inside of the retaining slot. At this point, a rectangular protrusion slides into the corresponding rectangular groove, thus limiting and fixing the protective cover and preventing it from rotating. The end of the hexagonal screw is inserted into an anti-rotation groove inside the protective cover. The anti-rotation groove is hexagonal, preventing the hexagonal screw from loosening by self-rotation and ensuring a stable connection between the crank body and the bicycle's bottom bracket.

[0014] The foot pedal connects to the internal threaded hole of the connector for installation and fixation. If the thread becomes stripped, the bolt can be unscrewed and the connector replaced. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance and structure of this utility model; Figure 2 This is a schematic diagram of the slot position structure of this utility model; Figure 3 This is a schematic diagram of the card plate structure of this utility model; Figure 4 This is a schematic diagram of the connecting seat structure of this utility model.

[0016] In the diagram: 1. Crank body; 2. First connector; 3. Second connector; 4. Connecting groove; 5. Slot; 6. Rectangular groove; 7. Protective cover; 8. Rectangular protrusion; 9. Clamping plate; 10. Circular groove; 11. Anti-rotation groove; 12. Deformation groove; 13. Fixing groove; 14. Connecting seat; 15. Internal threaded hole; 16. Through hole; 17. Bolt. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] Please see Figures 1-4 This embodiment of a bicycle crank assembly includes a crank body 1, which includes a first connector 2 and a second connector 3. A protective mechanism is provided on the inner side of the first connector 2. The protective mechanism includes a connecting groove 4 and a protective cover 7. The connecting groove 4 is located on one side of the first connector 2, and a placement hole is provided at one end of the connecting groove 4. The protective cover 7 is located inside the placement hole, and a snap-fit ​​mechanism is provided at the connection between the protective cover 7 and the placement hole. An installation mechanism is provided on the inner side of the second connector 3. The snap-fit ​​mechanism includes a slot 5, a rectangular groove 6, a rectangular protrusion 8, a locking plate 9, a circular groove 10, an anti-rotation groove 11, and a deformation groove 12. The slot 5 is located inside the placement hole, the rectangular groove 6 is located inside the placement hole, the rectangular protrusion 8 is integrally formed and connected to the outer side of the protective cover 7, the locking plate 9 is integrally formed and connected to the bottom of the protective cover 7, the circular groove 10 is located at the bottom of the protective cover 7, the anti-rotation groove 11 is located inside the protective cover 7, there are two locking plates 9, and the deformation groove 12 is located between two adjacent locking plates 9.

[0019] The crank body 1 is inserted into the bicycle's bottom bracket via the connecting groove 4 and then tightened with a hexagonal screw. After that, the protective cover 7 is inserted into the placement hole. During insertion, the two retaining plates 9 are guided by the arc surface at the bottom and deform inward. After full insertion, the retaining plates 9 spring back and engage with the inside of the retaining groove 5. At this time, the rectangular protrusion 8 slides into the corresponding rectangular groove 6, thereby limiting and fixing the protective cover 7 and preventing it from rotating. The end of the hexagonal screw is inserted into the anti-rotation groove 11 inside the protective cover 7. The anti-rotation groove 11 is hexagonal and can prevent the hexagonal screw from rotating and loosening, ensuring a stable connection between the crank body 1 and the bicycle's bottom bracket.

[0020] Furthermore, the card plate 9 is snapped into the inner side of the card slot 5, and the bottom corner of the card plate 9 is set with an arc surface, so the card plate 9 has an arc-shaped structure.

[0021] Furthermore, rectangular grooves 6 are equidistantly distributed on the inner wall of the placement hole, and rectangular protrusions 8 are equidistantly distributed on the outer wall of the protective cover 7.

[0022] Furthermore, the protective cover 7 is slidably inserted into the placement hole via the rectangular groove 6 and the rectangular protrusion 8, with the inner wall of the rectangular groove 6 fitting against the outer wall of the rectangular protrusion 8.

[0023] Furthermore, the installation mechanism includes a fixing groove 13, a connecting seat 14, an internal threaded hole 15, a through hole 16, and a bolt 17. The fixing groove 13 is located on the outside of the second connector 3. The connecting seat 14 is slidably inserted into the inside of the fixing groove 13. The internal threaded hole 15 is located through the inside of the connecting seat 14. The through hole 16 is located on the outside of the second connector 3. The bolt 17 is inserted through the through hole 16. The foot pedal is connected to the internal threaded hole 15 of the connecting seat 14, thereby installing and fixing it. If the thread strips, the bolt 17 can be unscrewed and the connecting seat 14 can be replaced.

[0024] Furthermore, the inner wall of the fixing groove 13 fits against the outer wall of the connecting seat 14, which has a rectangular structure.

[0025] The working principle of the above embodiment is as follows: the crank body 1 is inserted into the bicycle's bottom bracket through the connecting groove 4, and then tightened with a hexagonal screw. After that, the protective cover 7 is inserted into the placement hole. During insertion, the two retaining plates 9 are guided by the arc surface at the bottom and deform inward. After complete insertion, the retaining plates 9 spring back and engage with the inside of the retaining groove 5. At this time, the rectangular protrusion 8 slides into the corresponding rectangular groove 6, thereby limiting and fixing the protective cover 7 and preventing the protective cover 7 from rotating. The end of the hexagonal screw is inserted into the anti-rotation groove 11 inside the protective cover 7. The anti-rotation groove 11 is hexagonal. The anti-rotation groove 11 can prevent the hexagonal screw from rotating and loosening, ensuring a stable connection between the crank body 1 and the bicycle's bottom bracket. The pedal is connected to the internal threaded hole 15 of the connecting seat 14, thereby installing and fixing it. If the thread strips, the bolt 17 can be unscrewed and the connecting seat 14 can be replaced.

[0026] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crank assembly for a bicycle, characterized in that: The crank body (1) includes a first connector (2) and a second connector (3). The inner side of the first connector (2) is provided with a protective mechanism, which includes a connecting groove (4) and a protective cover (7). The connecting groove (4) is opened on one side of the first connector (2). One end of the connecting groove (4) is provided with a placement hole. The protective cover (7) is provided inside the placement hole. A snap-fit ​​mechanism is provided at the connection between the protective cover (7) and the placement hole. An installation mechanism is provided inside the second connector (3).

2. The bicycle crank assembly according to claim 1, characterized in that: The snap-fit ​​mechanism includes a snap-fit ​​groove (5), a rectangular groove (6), a rectangular protrusion (8), a snap-fit ​​plate (9), a circular groove (10), an anti-rotation groove (11), and a deformation groove (12). The snap-fit ​​groove (5) is opened inside the placement hole. The rectangular groove (6) is opened inside the placement hole. The rectangular protrusion (8) is integrally formed and connected to the outside of the protective cover (7). The snap-fit ​​plate (9) is integrally formed and connected to the bottom of the protective cover (7). The circular groove (10) is set at the bottom of the protective cover (7). The anti-rotation groove (11) is opened inside the protective cover (7). There are two snap-fit ​​plates (9). The deformation groove (12) is set between two adjacent snap-fit ​​plates (9).

3. A crank assembly for a bicycle according to claim 2, characterized in that: The card plate (9) is snapped into the inner side of the card slot (5). The bottom corner of the card plate (9) is set with an arc surface, and the card plate (9) has an arc-shaped structure.

4. A crank assembly for a bicycle according to claim 2, characterized in that: The rectangular grooves (6) are equidistantly distributed on the inner wall of the placement hole, and the rectangular protrusions (8) are equidistantly distributed on the outer wall of the protective cover (7).

5. A crank assembly for a bicycle according to claim 1, characterized in that: The protective cover (7) is slidably inserted into the placement hole through a rectangular groove (6) and a rectangular protrusion (8), with the inner wall of the rectangular groove (6) fitting against the outer wall of the rectangular protrusion (8).

6. A crank assembly for a bicycle according to claim 1, characterized in that: The mounting mechanism includes a fixing groove (13), a connecting seat (14), an internal threaded hole (15), a through hole (16), and a bolt (17). The fixing groove (13) is opened on the outside of the second connector (3). The connecting seat (14) is slidably inserted into the inside of the fixing groove (13). The internal threaded hole (15) is opened through the inside of the connecting seat (14). The through hole (16) is opened on the outside of the second connector (3). The bolt (17) is inserted through the through hole (16).

7. A bicycle crank assembly according to claim 6, characterized in that: The inner wall of the fixing groove (13) is in contact with the outer wall of the connecting seat (14), which is a rectangular structure.

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