Spring torsion retainer of speed change belt pulley of motorcycle

Abstract

The spring torsion retainer is characterized by comprising an upper ring body and a lower ring body which can rotate relatively and are buckled with each other, a circle of steel balls are arranged between the upper ring body and the lower ring body, and steel ball mounting grooves are correspondingly formed in the opposite end faces of the upper ring body and the lower ring body; the spring seat is sleeved with the upper ring body and the lower ring body, the upper ring body and the lower ring body are supported between the spring and the spring seat, and relative rotation is formed between the corresponding spring and the spring seat. The variable-speed belt pulley of the motorcycle is reasonable in design, stable in structure and high in practicability, and effectively solves the problems that a spring and a spring seat in a traditional variable-speed belt pulley of the motorcycle are seriously abraded, and torque transmission is unstable.

Description

Technical Field

[0001] This utility model relates to an improved invention of a motorcycle gearshift pulley, and more particularly to an improved invention of a spring torque retainer for a motorcycle gearshift pulley. Background Technology

[0002] Motorcycle shift pulleys, as key components of continuously variable transmissions (CVT) systems, are widely used in various scooters and some off-road motorcycles. Their working principle involves the axial movement of a sliding cone disc on a central shaft, changing the transmission radius of the belt between the discs, thus achieving continuously variable transmission. During this process, the movement of the sliding cone disc is driven by centrifugal force, while a return spring provides the restoring force, ensuring that the transmission system automatically returns to its initial state at low speeds or during deceleration.

[0003] However, in traditional structures, the spring acts directly on the spring seat. Because the sliding cone rotates, it causes the spring seat to rotate as well, while the other end of the spring is usually fixed to a stationary component. This results in relative rotation between the spring and the spring seat. This relative rotation not only causes wear between the spring and the spring seat, reducing the spring's lifespan, but also affects the smoothness and stability of the transmission response due to uneven torque transmission. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a spring torque retainer for a motorcycle gearbox pulley.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A spring torque retainer for a motorcycle gearbox pulley, characterized in that it includes an upper ring body and a lower ring body that are rotatable and interlocking, a ring of steel balls is provided between the upper ring body and the lower ring body, and corresponding steel ball mounting grooves are provided on the opposite end faces of the upper ring body and the lower ring body; the upper ring body and the lower ring body are sleeved on a spring seat, and the upper ring body and the lower ring body are supported between the spring and the spring seat, and the spring and the spring seat rotate relative to each other.

[0006] The lower end of the upper ring body is provided with a lower step, and the upper end of the lower ring body is provided with an upper step. The upper and lower steps are staggered, and there are interlocking protrusions between the adjacent sides of the upper and lower steps.

[0007] A retaining ring is provided on the outer edge of the upper ring, and the retaining ring is radially limited to one end of the spring.

[0008] Both the upper and lower rings are steel rings.

[0009] The beneficial effects of this utility model are that the improved spring torque retainer for the motorcycle gearbox pulley, by setting up an upper ring body and a lower ring body that can rotate relative to each other, and placing a steel ball between them, allows the upper ring body and the lower ring body to achieve low-friction relative rotation, effectively isolating the direct contact between the spring and the spring seat, thereby significantly reducing wear and extending the service life of the spring and the entire gearbox system; and the spring can maintain a relatively constant torque during compression and release, avoiding torque fluctuations caused by spring offset or torsion, thereby improving the response speed and smoothness of the gearbox system. Attached Figure Description

[0010] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This utility model Figure 1 AA sectional view.

[0013] Figure 3 This is a three-dimensional structural view of the present invention.

[0014] Figure 4 This diagram shows the application of this utility model in a motorcycle gearbox pulley. Detailed Implementation

[0015] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1-4 The spring torque retainer of the motorcycle gearbox pulley includes an upper ring 1 and a lower ring 2 that are rotatable and interlocking. A ring of steel balls 3 is provided between the upper ring 1 and the lower ring 2, forming rolling support for the upper ring 1 and the lower ring 2. Correspondingly, the opposite end faces of the upper ring 1 and the lower ring 2 are provided with mounting grooves for the steel balls 3, and the steel balls 3 are evenly distributed in the mounting grooves 4. Preferably, the steel balls 3 may also be equipped with retainers. The upper ring 1 and the lower ring 2 are sleeved on a spring seat 5, and the upper ring 1 and the lower ring 2 are supported between a spring 6 and a spring seat 5. Specifically, the lower end of the spring 6 abuts against the upper end face of the upper ring 1, and the upper end face of the spring seat 5 abuts against the lower end face of the lower ring 2, and the spring 6 and the spring seat 5 rotate relative to each other. The motorcycle gearbox pulley is an existing structure, including a fixed conical disc 7, a sliding conical disc 8, a spring 6, a spring seat 5, a shaft core 9, a fixing plate 10, etc.

[0016] As a further improved embodiment, the lower end of the upper ring 1 is provided with a lower step 11, and the upper end of the lower ring 2 is provided with an upper step 12. The upper step 12 and the lower step 11 are offset from each other, and there are interlocking protrusions 13 between adjacent sides of the upper step 12 and the lower step 11. This enhances the connection stability between the upper ring 1 and the lower ring 2, preventing misalignment or detachment during high-speed rotation or uneven stress, thereby improving the reliability of the overall structure.

[0017] As a further improved implementation, a retaining ring 14 is provided on the outer edge of the upper ring body 1, and the retaining ring 14 is radially limited to one end of the spring 6. This prevents the spring 6 from radially displacing or twisting during operation, further enhancing the stability and consistency of the spring 6's operation.

[0018] As a further improved embodiment, both the upper ring 1 and the lower ring 2 are steel rings. They possess high strength and wear resistance, maintaining structural integrity and functionality under high-speed rotation and frequent stress conditions, thus adapting to the complex and ever-changing operating environment of motorcycles.

[0019] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A spring torque retainer for a motorcycle gearshift pulley, characterized in that: It includes an upper ring body and a lower ring body that can rotate relative to each other and interlock. A steel ball is provided between the upper ring body and the lower ring body, and a steel ball mounting groove is provided on the corresponding end face of the upper ring body and the lower ring body. The upper ring body and the lower ring body are sleeved on the spring seat and supported between the spring and the spring seat, and the spring and the spring seat rotate relative to each other.

2. The spring torque retainer for the motorcycle gearshift pulley as described in claim 1, characterized in that: The lower end of the upper ring body is provided with a lower step, and the upper end of the lower ring body is provided with an upper step. The upper and lower steps are staggered, and there are interlocking protrusions between the adjacent sides of the upper and lower steps.

3. The spring torque retainer for the motorcycle gearshift pulley as described in claim 1, characterized in that: A retaining ring is provided on the outer edge of the upper ring, and the retaining ring is radially limited to one end of the spring.

4. The spring torque retainer for the motorcycle gearshift pulley as described in any one of claims 1-3, characterized in that: Both the upper and lower rings are steel rings.

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