Pedal shaft assembly and bicycle pedal

Abstract

The pedal shaft assembly comprises a shaft core, a shaft sleeve, a thread sleeve and a plurality of balls, the shaft sleeve is provided with an inner cavity, the shaft core is partially arranged in the inner cavity of the shaft sleeve and rotates relatively, the shaft core is provided with the thread sleeve at an opening of the shaft sleeve, and the outer wall of the thread sleeve is provided with a connecting portion used for being connected with the shaft sleeve. The balls are arranged between the shaft core and the threaded sleeve to form an integrated rotating structure, and the balls are always kept in a track formed by matching the shaft core and the threaded sleeve in the disassembly and maintenance process of the pedal shaft. According to the pedal shaft assembly, the thread sleeve, the balls and the shaft core form an integral core shaft structure, adjusting nuts are reduced, the relative position of the shaft core does not need to be adjusted, and the assembly efficiency is high.

Description

Technical Field

[0001] This utility model discloses a pedal shaft assembly and a bicycle pedal, which, according to the International Patent Classification (IPC), belong to the field of bicycle pedal technology. Background Technology

[0002] Bicycle pedals are typically connected to the crank via a pedal axle. Pedals can be standard pedals or clipless pedals with a locking mechanism. One type of clipless pedal includes an adjusting nut. When the user disassembles and maintains the pedal, the ball bearings inside the pedal axle are separated. After reassembly, the adjusting nut is needed to adjust the alignment of the axle and bushing. Therefore, assembling the clipless pedal requires a high level of expertise; improper adjustment affects pedal performance, and the time-consuming process of reassembling the individual ball bearings is also a significant drawback. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a pedal shaft assembly that improves the dispersed balls into a bearing structure integrated with the shaft core, thereby improving the efficiency of disassembly and assembly.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A pedal axle assembly includes a shaft core, a bushing, a threaded sleeve, and a plurality of balls. The bushing has an inner cavity, and the shaft core is placed in the inner cavity of the bushing and rotates relative to it. The part of the shaft core outside the bushing has a connector for connecting a crank. The shaft core has a threaded sleeve at the opening of the bushing, and the outer wall of the threaded sleeve has a connecting part for connecting to the bushing. The inner wall of the threaded sleeve has an outer annular groove for the balls, and the shaft core has an inner annular groove for the balls. A plurality of balls are placed between the shaft core and the threaded sleeve to form a combined rotating structure. During the disassembly and maintenance of the pedal axle, each ball always remains within the track formed by the engagement of the shaft core and the threaded sleeve.

[0006] Furthermore, one end of the shaft core located inside the bushing is fitted with a bearing, which cooperates with the bushing to form a rotation fulcrum.

[0007] Furthermore, the balls between the shaft core and the threaded sleeve are fully fitted, and the outer annular groove of the ball on the threaded sleeve and the inner annular groove of the ball on the shaft core are provided with notches to assemble the balls and form a fully fitted structure.

[0008] Furthermore, the outer annular groove of the ball in the circumferential direction of the threaded sleeve and the inner annular groove of the ball on the shaft core cooperate to form a ball track, and the outer annular groove of the ball in the threaded sleeve has a stop portion to keep the ball in the track after assembly.

[0009] Furthermore, the screw sleeve has an unloading part that cooperates with the unloading tool, and a threaded part on one side of the unloading part of the screw sleeve is screwed into the opening of the screw sleeve.

[0010] Furthermore, the bushing opening has a right-angled annular platform that mates with the threaded end face of the threaded sleeve.

[0011] Furthermore, a sealing ring is provided between the shaft core and the threaded sleeve to prevent external impurities from entering the inner cavity through the gap between the shaft core and the threaded sleeve.

[0012] Furthermore, the shaft core has an annular groove on the outside of the inner annular groove of the ball for fitting a sealing ring.

[0013] Furthermore, the sealing ring has a first blocking portion and a second blocking portion. The first blocking portion forms a bowl-shaped sealing ring portion, and an annular recess is formed between the first blocking portion and the second blocking portion, which together form an isolation cavity with the outer bushing.

[0014] This utility model also provides a bicycle pedal, including the above-mentioned pedal shaft assembly and a matching pedal body.

[0015] This utility model relates to a pedal shaft assembly that integrates a threaded sleeve, balls, and a shaft core into a single integral mandrel structure. During disassembly, the threads of the threaded sleeve and shaft sleeve are loosened, allowing the integral mandrel structure to be disassembled for maintenance or repair. During assembly, simply tighten the threaded sleeve into the shaft sleeve; no adjustment of the relative position of the shaft core is required, resulting in high assembly efficiency. Compared to existing locking pedal shaft structures, this design eliminates the need for adjusting nuts, and the balls and related components at the shaft sleeve form a unified whole, making disassembly and assembly convenient and quick. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional view of an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the shaft core of this utility model.

[0019] Figure 4 This is a schematic diagram of the screw sleeve of this utility model.

[0020] Figure 5 This is a schematic diagram of the right foot pedal of this utility model.

[0021] Figure 6 This is a schematic diagram of the left foot pedal of this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Example: Please refer to Figures 1 to 4A pedal axle assembly includes a core 1, a bushing 2, a threaded sleeve 3, and several balls 4. The bushing 2 has an inner cavity 21, the diameter of which gradually decreases from the opening inwards, as shown in Figure 2. The core portion or one end of the core is placed in the inner cavity of the bushing and rotates relative to it. The part of the core 1 outside the bushing has a connector for connecting a crank. This connector can be threaded. The end of the connector has a hexagonal or polygonal slot for accommodating installation tools. The core 1 has a threaded sleeve 3 at the opening of the bushing 2. The outer wall of the threaded sleeve 3 has a connecting part for connecting the bushing. The inner wall of the threaded sleeve 3 has an outer ring groove 31 for the balls. The core 1 has an inner ring groove 11 for the balls. Several balls 4 are placed between the core 1 and the threaded sleeve 3 to form a combined rotating structure. During the disassembly and maintenance of the pedal axle, each ball 4 always remains within the track formed by the engagement of the core 1 and the threaded sleeve 3. To improve load-bearing strength, each ball 4 between the shaft core 1 and the threaded sleeve 3 is a full-fill structure. The outer ring groove of the ball in the threaded sleeve 3 and the inner ring groove of the ball on the shaft core 1 are provided with notches to assemble the balls and form a full-fill structure.

[0024] In one implementation of this utility model, such as Figure 2 As shown, one end of the shaft core 1 located inside the bushing is fitted with a bearing 5, which cooperates with the bushing 2 to form a rotation fulcrum. The bushing 2 is fixedly connected to the pedal body 6. When the pedal body 6 rotates relative to the shaft core 1, the shaft core 1 has two rotation fulcrums. One is the first rotation fulcrum at the inner end of the shaft core, which is directly assembled between the shaft core 1 and the bushing 2 by the bearing 5. The other fulcrum is the second rotation fulcrum formed by the shaft core 1 cooperating with the screw sleeve 3. This fulcrum is formed by the inner ring groove of the shaft core 1 cooperating with each ball 4 and the screw sleeve 3. During disassembly, it is ensured that the ball 4 and the shaft core 1 are integrated and do not separate, making maintenance and repair convenient. During assembly, the shaft core is directly fitted with the inner bearing 5 and screwed into the bushing for assembly, without the need for adjustment and positioning, saving time.

[0025] In one embodiment of this utility model, please refer to Figure 2 , Figure 3 , Figure 4 The outer annular groove 31 of the ball bearing in the circumferential direction of the threaded sleeve 3 cooperates with the inner annular groove 11 of the ball bearing on the shaft core 1 to form a ball track. The outer annular groove 31 of the threaded sleeve has a stop portion to keep the ball bearing in the track after assembly. The corresponding outer annular groove 11 of the ball bearing on the shaft core 1 has a stop portion that surrounds the outer annular groove 31 of the threaded sleeve to form a ball track.

[0026] In one embodiment of this utility model, please refer to Figure 1 , Figure 2 , Figure 4 The screw sleeve 3 has an unloading part 32 that cooperates with the unloading tool. The unloading part 32 can be a polygonal torsion part, such as a hexagonal nut part or other toothed nut part. One side of the screw sleeve unloading part 32 is provided with a threaded part that is screwed into the opening of the bushing 2. The screw sleeve unloading part 32 cooperates with the rotating tool to lock or loosen the screwed connection between the screw sleeve 3 and the bushing 2, thereby disassembling the pedal shaft.

[0027] In one embodiment of this utility model, please refer to Figure 2 The bushing 2 has an inwardly opening right-angled annular platform 22 that mates with the threaded end face of the screw sleeve 3. The screw sleeve 3 and the bushing 2 are directly threaded and locked together.

[0028] In one embodiment of this utility model, a sealing ring 7 is provided between the shaft core 1 and the threaded sleeve 3 to prevent external impurities from entering the inner cavity through the gap between the shaft core and the threaded sleeve. Specifically, the shaft core 1 has an annular groove 12 on the outside of the inner annular groove 11 of the ball for mounting the sealing ring. The sealing ring 7 has a first blocking part 71 and a second blocking part 72. The first blocking part 71 forms a bowl-shaped sealing ring, and an annular recess is formed between the first blocking part 71 and the second blocking part 72, which together with the outer threaded sleeve forms an isolation cavity. Since the shaft core 1 and the threaded sleeve 3 can rotate relative to each other, water, impurities, etc. can easily enter through the gap, affecting the operation of the ball. The sealing ring 7 provides a protective function.

[0029] This utility model also provides a bicycle pedal, including the aforementioned pedal shaft assembly 100 and a matching pedal body 6, wherein the bushing 2 of the pedal shaft assembly 100 is connected to the pedal body 6. Figure 5 This is a schematic diagram of the right foot pedal of this utility model. Figure 6 This is a schematic diagram of the left foot pedal of this utility model. When the pedal body 6 rotates relative to the axle core 1, the two rotation fulcrums of the axle core 1 provide support. The pedal body 6 can be a locking pedal with a locking function, suitable for high-demand environments such as outdoor cycling or competitions. In order to improve the overall weight reduction of the vehicle, the axle core 1 can be made of high-strength and lightweight materials, such as titanium alloy.

[0030] The above description is merely an embodiment of the invention's technical content. Any modifications or variations made by those skilled in the art using this invention are within the scope of the invention's claims, and are not limited to those disclosed in the embodiments.

Claims

1. A pedal shaft assembly characterized by: The pedal shaft assembly comprises a shaft core, a shaft sleeve, a screw sleeve and a plurality of balls. The shaft sleeve has an inner cavity. The shaft core is partially arranged in the inner cavity of the shaft sleeve and rotates relative to the shaft sleeve. The shaft core has a joint for connecting a crank. The shaft core is provided with the screw sleeve at the opening of the shaft sleeve. The outer wall of the screw sleeve is provided with a connecting part for connecting the shaft sleeve. The inner wall of the screw sleeve is provided with a ball outer ring groove. The shaft core is provided with a ball inner ring groove. The plurality of balls are arranged between the shaft core and the screw sleeve to form a combined rotating structure. During disassembly and maintenance of the pedal shaft, the balls are always kept in the track formed by the shaft core and the screw sleeve.

2. A pedal shaft assembly according to claim 1, wherein: The shaft core is provided with a bearing at one end in the shaft sleeve to form a rotating fulcrum with the shaft sleeve.

3. A pedal shaft assembly according to claim 1, wherein: The balls between the shaft core and the screw sleeve are in a full loading structure. The ball outer ring groove of the screw sleeve and the ball inner ring groove on the shaft core are provided with notches on one side to assemble the balls to form the full loading structure.

4. A pedal shaft assembly according to claim 1, wherein: The ball outer ring groove in the circumferential direction of the screw sleeve cooperates with the ball inner ring groove on the shaft core to form a ball track. The ball outer ring groove of the screw sleeve has a stop part to keep the balls in the track after assembly.

5. A pedal shaft assembly according to claim 1, wherein: The screw sleeve is provided with an unloading part for cooperating with an unloading tool. One side of the unloading part of the screw sleeve is provided with a threaded part for screwing with the shaft sleeve.

6. A pedal shaft assembly according to claim 1, wherein: The opening of the shaft sleeve is provided with a right-angled annular platform for cooperating with the threaded end surface of the screw sleeve.

7. A pedal shaft assembly according to any one of claims 1 to 6, wherein: A sealing ring is arranged between the shaft core and the screw sleeve to prevent foreign matters from entering the inner cavity through the gap between the shaft core and the screw sleeve.

8. A pedal shaft assembly according to claim 7, wherein: The shaft core is provided with an annular groove outside the ball inner ring groove for assembling the sealing ring.

9. A pedal shaft assembly according to claim 7, wherein: The sealing ring has a first blocking part and a second blocking part. The first blocking part forms a bowl-shaped sealing ring part. The first blocking part and the second blocking part form an annular recess between them and constitute an isolation cavity with the screw sleeve outside.

10. A bicycle pedal, comprising the pedal shaft assembly according to any one of claims 1 to 9 and a matching pedal body.

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