Rotating shaft assembly and disc brake
By replacing small torsion springs with one-way bearings in the brakes, the problem of small torsion springs being too short is solved, and the brake performance is more stable and the life span is achieved.
Patent Information
- Application Number
- CN202411258235.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-02-14
AI Technical Summary
The small torsion springs in existing brakes have too short life, resulting in reduced brake performance and shorter service life.
A unidirectional bearing is used to replace a small torsion spring, which transmits torque through the rigidity of the unidirectional bearing and extends the service life.
Since the rigidity of unidirectional bearings is much better than that of torsion springs, it can greatly extend the service life in the same use scenarios, making the disc brakes using this shaft assembly more stable and have a longer service life.
Smart Images
Figure CN119435599A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of brakes, and in particular to a rotating shaft assembly and a disc brake. Background Art
[0002] The brake pad will be worn during braking, causing the brake gap to increase. In order to compensate for the increased gap and keep the gap between the brake pad and the brake disc constant, CN1948778A discloses a "floating caliper double push rod pneumatic disc brake based on rectangular torsion spring one-way clutch", in which the main adjustment part is composed of an adjustment sleeve, a large torsion spring, a rotating circle, a small torsion spring, a driving shaft and other structures.
[0003] When the brake starts to work, the compressed air first pushes the air chamber piston to drive the air chamber push rod forward, driving the pressure arm to rotate around the fixed fulcrum. A cylindrical pin is bonded to the small hole on the left side of the pressure arm. When the pressure arm rotates, it will drive the cylindrical pin to move. The cylindrical pin first goes through an empty stroke to eliminate the preset gap value between it and the adjustment sleeve. When this gap value is equalized by the pin, the pin will drive the adjustment sleeve to continue to rotate clockwise.
[0004] A right-handed rectangular steel wire cross-section torsion spring is installed in the adjustment sleeve by interference fit. The upper end of the large torsion spring is fitted with the inner surface of the outer cylinder of the rotating circle, and the lower end of the large torsion spring is fitted with the inner cylindrical surface of the adjustment sleeve. Initially, due to the interference amount of interference fit between the adjustment sleeve, the rotating circle and the large torsion spring, the three can be temporarily regarded as a whole. When the adjustment sleeve is driven to rotate by the pin, this rotational motion will be transmitted to the rotating circle through the large torsion spring. A small rectangular steel wire torsion spring with a small cross-section is also installed on the outer cylindrical surface of the inner circle of the rotating circle by interference fit. The lower end of the small torsion spring is also installed on the outer cylindrical surface of the active shaft by interference fit. When the rotating circle is driven to rotate, this rotational motion will be transmitted to the active shaft through the small torsion spring.
[0005] When the driving shaft overcomes the brake clearance of the brake and is fixed by the friction plate, the driving shaft will not continue to rotate. At this time, the pressure arm will continue to be driven by the air chamber to rotate, and this rotation will continue to be transmitted to the adjustment sleeve through the pin. When the adjustment sleeve continues to drive the driving shaft to rotate through the large torsion spring, the rotating circle, and the small torsion spring, since the rotational movement of the driving shaft is suppressed at this moment, the adjustment sleeve will drive the lower end of the large torsion spring to continue to rotate, and the rotation force transmission route of the upper end of the large torsion spring through the rotating circle and the small torsion spring is forcibly cut off, and the large torsion spring will be driven by the adjustment sleeve to reduce its diameter. When the diameter is reduced, the friction torque between the large torsion spring, the adjustment sleeve and the rotating circle will reach the upper limit. When the adjustment sleeve continues to be driven to rotate, this rotational movement will be cut off at the large torsion spring to avoid forcibly transmitting the rigid rotational movement to the entire subsequent motion chain and thus destroying the function of subsequent parts.
[0006] However, during actual use, the applicant discovered that since the small torsion spring is a rectangular torsion spring structure with small-section steel wire, the friction torque caused by the interference fit between the large torsion spring, the adjustment sleeve and the rotating ring will eventually be completely transferred to the inner diameter of the small torsion spring and be fully borne by the small torsion spring. As the number of braking times accumulates, the preset interference between the small torsion spring, the driving shaft and the rotating ring will gradually be completely consumed by wear, and the small torsion spring will fail and be unable to transmit torque, which will directly affect the performance and service life of the brake. Summary of the invention
[0007] In view of this, it is necessary to provide a rotating shaft assembly and a disc brake to solve the technical problem that the service life of the small torsion spring of the existing brake is too short.
[0008] The present invention provides a rotating shaft assembly, which comprises: a rotating shaft, a one-way bearing, a rotating ring, an adjusting sleeve and a torsion spring, wherein the rotating shaft has a cylindrical rotating shaft portion, the one-way bearing is fixedly sleeved on the rotating shaft portion, the rotating ring is fixedly sleeved outside the one-way bearing, the adjusting sleeve is sleeved outside the rotating ring, the torsion spring is arranged in the rotating ring and the adjusting sleeve, the upper part of the torsion spring is matched and connected with the rotating ring, and the lower part of the torsion spring is matched and connected with the inner side surface of the adjusting sleeve, so that an interference fit connection is formed between the rotating ring and the adjusting sleeve.
[0009] Furthermore, the rotating circle is an annular structure with an n-shaped cross-section, which includes an inner wall, an outer wall and a top wall. The top ends of the inner wall and the outer wall are respectively integrally connected to the two ends of the top wall. The inner wall is fixedly sleeved outside the one-way bearing, and the upper part of the torsion spring is cooperatively connected with the inner side surface of the outer wall.
[0010] Furthermore, a placement groove is formed on the inner side surface of the adjustment sleeve, and the outer wall is embedded in the placement groove so that the inner side surface of the outer wall is flush with the inner side surface of the adjustment sleeve.
[0011] Furthermore, the rotating shaft also has a shoulder portion integrally connected to the rotating shaft portion, the lower movable sleeve of the adjusting sleeve is arranged outside the shoulder portion, and the shoulder portion, the rotating shaft portion, the rotating ring and the adjusting sleeve together form an accommodating cavity for accommodating the torsion spring.
[0012] Furthermore, the upper end of the torsion spring is spaced from the inner side surface of the top wall, and the lower end of the torsion spring is spaced from the shaft shoulder.
[0013] Furthermore, it also includes a lower thrust bearing, which is sleeved on the rotating shaft and has its lower surface arranged on the shaft shoulder, and the lower end of the torsion spring is spaced from the upper surface of the lower thrust bearing.
[0014] Furthermore, it also includes an upper thrust bearing, which is arranged on the rotating shaft and has a lower surface arranged on the outer side of the top wall.
[0015] Furthermore, it also includes a retaining spring fixedly sleeved on the rotating shaft portion, the retaining spring is located above the upper thrust bearing and forms a gap with the upper surface of the upper thrust bearing.
[0016] The invention provides a disc brake, which comprises a rotating shaft assembly and a rotating assembly. The rotating shaft assembly is transmission-connected with an adjusting sleeve to drive the adjusting sleeve to rotate.
[0017] Furthermore, it also includes a brake assembly, which is connected to one end of the rotating shaft away from the rotating shaft portion, and rotating the rotating shaft can drive the brake assembly to move in a direction away from the rotating shaft portion.
[0018] Compared with the prior art, the shaft assembly provided by the present invention uses a one-way bearing to replace a small torsion spring. Under the premise of achieving the same technical effect, since the rigidity of the bearing is far superior to that of the torsion spring, the service life can be greatly extended under the same usage scenario, making the disc brake using the shaft assembly more stable in performance and longer in service life.
[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A structural schematic diagram of a preferred embodiment of a rotating shaft assembly provided by the present invention; Figure 2 A cross-sectional view of the shaft assembly provided by the present invention Figure 3 A schematic structural diagram of a preferred embodiment of the disc brake provided by the present invention. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.
[0022] See also Figure 1 and Figure 2 The present invention provides a rotating shaft assembly, which includes a rotating shaft 1, a one-way bearing 2, a rotating ring 3, an adjusting sleeve 4 and a torsion spring 5.
[0023] The rotating shaft 1 has a cylindrical rotating shaft portion 11, and the one-way bearing 2 is fixedly sleeved on the rotating shaft portion 11. The one-way bearing 2 can only transmit the rotation in one direction to the rotating shaft portion 11, so that the rotating shaft 1 and the one-way bearing 2 rotate together. When the one-way bearing rotates in the other direction, the inner and outer rings of the one-way bearing 2 rotate relative to each other, blocking the transmission of torque. In this embodiment, the one-way bearing 2 adopts a one-way needle bearing. In other embodiments, a suitable one-way bearing 2 can also be adopted according to actual needs.
[0024] The rotating ring 3 is fixedly sleeved outside the one-way bearing 2, and the adjusting sleeve 4 is sleeved outside the rotating ring 3. The torsion spring 5 is arranged inside the rotating ring 3 and the adjusting sleeve 4, and the upper part of the torsion spring 5 is matched and connected with the rotating ring 3, and the lower part of the torsion spring 5 is matched and connected with the inner side surface of the adjusting sleeve 4, so that an interference fit connection is formed between the rotating ring 3 and the adjusting sleeve 4. When the adjusting sleeve 4 rotates, due to the interference fit connection formed between the rotating ring 3 and the adjusting sleeve 4, the adjusting sleeve 4 can rotate with the rotating ring 3, and the rotating ring 3 further drives the rotating ring 3 to rotate together through the one-way bearing 2, thereby realizing the extension of the brake pad.
[0025] When the rotating shaft 1 overcomes the brake clearance of the brake and is fixed by the friction plate, the rotating shaft 1 will not continue to rotate. However, the adjusting sleeve 4 continues to rotate under the external force. Since the rotational motion of the rotating shaft 1 is suppressed, the one-way bearing 2 and the rotating ring 3 cannot rotate either. The adjusting sleeve 4 will rotate relative to the rotating ring 3, driving the lower end of the torsion spring 5 to continue to rotate. The diameter of the torsion spring 5 is reduced by rotation, the prestress applied to the adjusting sleeve 4 and the rotating ring 3 disappears, and the interference fit connection relationship between the adjusting sleeve 4 and the rotating ring 3 is destroyed. The rotational force transmission route between the adjusting sleeve 4 and the rotating ring 3 is forcibly cut off. And when the diameter is reduced, the friction torque of the torsion spring 5, the adjusting sleeve 4 and the rotating ring 3 will reach the upper limit. When the adjusting sleeve 4 continues to be driven to rotate, this rotational motion will be cut off at the torsion spring 5 to avoid the rigid rotational motion from being transmitted to the subsequent entire motion chain, causing damage to subsequent parts.
[0026] When the braking action is finished, the adjustment sleeve 4 rotates in the opposite direction, the torsion spring 5 returns to its original state, and the adjustment sleeve 4 and the rotating ring 3 form an interference fit connection relationship again, driving the rotating ring 3 and the adjustment sleeve 4 to move together. However, due to the presence of the one-way bearing 2, the rotating shaft 1 does not rotate in the opposite direction, thereby achieving the effect of moving the brake pad forward to compensate for the increased gap. And because the rigidity of the one-way bearing 2 is much better than that of the torsion spring, it can greatly extend the service life under the same usage scenario, making the disc brake using this rotating shaft assembly more stable and longer in service life.
[0027] In some embodiments, the rotating ring 3 is an annular structure with an n-shaped cross section, including an inner wall 31, an outer wall 32 and a top wall 33. The top ends of the inner wall 31 and the outer wall 32 are integrally connected to the two ends of the top wall 33, respectively, to form an n-shaped structure. The inner wall 31 is fixedly sleeved outside the one-way bearing 2, and the adjustment sleeve 4 is sleeved on the outer wall 32. The upper part of the torsion spring 5 extends into the rotating ring 3 and is matched and connected with the inner side surface of the outer wall 32.
[0028] In some embodiments, the inner side surface of the adjustment sleeve 4 forms a placement groove, and the outer wall 32 of the rotating ring 3 is embedded in the placement groove so that the inner side surface of the outer wall 32 is flush with the inner side surface of the adjustment sleeve 4 .
[0029] In some embodiments, the rotating shaft 1 also has a shoulder portion 12 integrally connected to the rotating shaft portion 11, and the lower movable sleeve of the adjusting sleeve 4 is arranged outside the shoulder portion 12, and the shoulder portion 12, the rotating shaft portion 11, the rotating circle 3 and the adjusting sleeve 4 together form an accommodating cavity for accommodating the torsion spring 5.
[0030] Furthermore, the upper end of the torsion spring 5 is spaced apart from the inner side surface of the top wall 33 , and the lower end of the torsion spring 5 is spaced apart from the shaft shoulder portion 12 .
[0031] When the applicant used the existing brake, i.e. the brake mentioned in the background technology, it was found that the large torsion spring of the brake only relied on the friction force of interference fit to cooperate with the adjustment sleeve and the rotating ring. When the diameter of the large torsion spring is forcibly rotated and reduced, at a certain moment, the friction torque will decay to zero, and the upper and lower positions of the large torsion spring will be uncontrollable, usually manifested as the large torsion spring moving downward. When the large torsion spring moves downward, as time accumulates, the moving distance will become longer and longer, and finally it will be manifested as the lower end face of the large torsion spring directly contacting the shoulder of the driving shaft with friction. And the downward movement of the large torsion spring will not stop with the friction contact between its lower end and the driving shaft. The upper end of the large torsion spring will continue to be elongated as the diameter is reduced, driving the rotating ring to move upward, and finally pushing the rotating ring to abut against the retaining ring. At this time, when the adjustment sleeve rotates, the transmission route of the originally preset large torsion spring and small torsion spring will fail, and when the pressure arm rotates, the driving shaft will be rotated with the pin, resulting in the brake clearance of the brake becoming more and more unstable, and the braking effect will be greatly reduced or completely failed.
[0032] Therefore, in the preferred embodiment of the present application, a lower thrust bearing 6 is provided, the lower thrust bearing 6 is sleeved on the rotating shaft portion 11 and its lower surface is provided on the shaft shoulder portion 12, and the lower end of the torsion spring 5 is spaced from the upper surface of the lower thrust bearing 6. When the torsion spring 5 moves downward, the lower end of the torsion spring 5 will contact the upper surface of the lower thrust bearing 5. When the torsion spring 5 rotates, the sliding friction of the torsion spring 5 directly contacting the shaft shoulder portion 12 is replaced by extremely small rolling friction, thereby avoiding the locking due to excessive friction.
[0033] Similarly, an upper thrust bearing 7 is also provided, which is sleeved on the shaft portion 11 and has its lower surface arranged on the outer surface of the top wall 33. A retaining spring 8 is fixedly sleeved on the shaft portion 11, and the retaining spring 8 is located above the upper thrust bearing 7 and is spaced from the upper surface of the upper thrust bearing 7.
[0034] When the upper end of the torsion spring 5 extends upward and contacts the rotating ring 3, it pushes the rotating ring 3 and the upper thrust bearing 7 to move upward until it contacts the retaining spring 8. When the torsion spring 5 rotates, the sliding friction between the top wall 33 and the retaining spring 8 is replaced by extremely small rolling friction to avoid locking due to excessive friction. Both the lower thrust bearing 6 and the upper thrust bearing 7 are plane thrust bearings.
[0035] See also Figure 3 The present invention also provides a disc brake, which includes: the above-mentioned shaft assembly 100 and a rotating assembly 200, the shaft assembly 200 is in transmission connection with the adjustment sleeve 4 to drive the adjustment sleeve 4 to rotate. The shaft assembly 200 can use the same structure as the corresponding part in the brake mentioned in the background technology to drive the adjustment sleeve 4 to rotate.
[0036] In some embodiments, the disc brake further includes a brake assembly 300, which is connected to an end of the rotating shaft 1 away from the rotating shaft portion 11. Rotating the rotating shaft 1 can drive the brake assembly 300 to move in a direction away from the rotating shaft portion 11 to compensate for the brake clearance. The brake assembly 300 can also use the same structure as the corresponding part of the brake mentioned in the background technology to drive the adjustment sleeve 4 to rotate.
[0037] Compared with the prior art, the shaft assembly provided by the present invention uses a one-way bearing to replace a small torsion spring. Under the premise of achieving the same technical effect, since the rigidity of the bearing is far superior to that of the torsion spring, the service life can be greatly extended under the same usage scenario, making the disc brake using the shaft assembly more stable in performance and longer in service life.
[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.
Claims
1. A rotating shaft assembly, characterized in that: It includes: A rotating shaft, a one-way bearing, a rotating ring, an adjusting sleeve and a torsion spring, wherein the rotating shaft has a cylindrical rotating shaft portion, the one-way bearing is fixedly sleeved on the rotating shaft portion, the rotating ring is fixedly sleeved outside the one-way bearing, the adjusting sleeve is sleeved outside the rotating ring, the torsion spring is arranged in the rotating ring and the adjusting sleeve, the upper part of the torsion spring is matched and connected with the rotating ring, and the lower part of the torsion spring is matched and connected with the inner side surface of the adjusting sleeve, so that an interference fit connection is formed between the rotating ring and the adjusting sleeve.
2. The shaft assembly according to claim 1, characterized in that: The rotating circle is an annular structure with an n-shaped cross-section, which includes an inner wall, an outer wall and a top wall. The top ends of the inner wall and the outer wall are respectively integrally connected to the two ends of the top wall. The inner wall is fixedly sleeved outside the one-way bearing, and the upper part of the torsion spring is cooperatively connected with the inner side surface of the outer wall.
3. The shaft assembly according to claim 2, characterized in that: The inner side surface of the adjustment sleeve forms a placement groove, and the outer wall is embedded in the placement groove so that the inner side surface of the outer wall is flush with the inner side surface of the adjustment sleeve.
4. The shaft assembly according to claim 2, characterized in that: The rotating shaft also has a shoulder portion integrally connected to the rotating shaft portion, the lower movable sleeve of the adjusting sleeve is arranged outside the shoulder portion, and the shoulder portion, the rotating shaft portion, the rotating circle and the adjusting sleeve together form an accommodating cavity for accommodating the torsion spring.
5. The shaft assembly according to claim 4, characterized in that: The upper end of the torsion spring is spaced apart from the inner side surface of the top wall, and the lower end of the torsion spring is spaced apart from the shaft shoulder.
6. The shaft assembly according to claim 5, characterized in that: It also includes a lower thrust bearing, which is sleeved on the rotating shaft portion and has a lower surface arranged on the shaft shoulder portion, and the lower end of the torsion spring is spaced from the upper surface of the lower thrust bearing.
7. The shaft assembly according to claim 5, characterized in that: It also includes an upper thrust bearing, which is arranged on the rotating shaft portion and has a lower surface arranged on the outer side surface of the top wall.
8. The shaft assembly according to claim 7, characterized in that: It also includes a retaining spring fixedly sleeved on the rotating shaft portion, wherein the retaining spring is located above the upper thrust bearing and forms a gap with the upper surface of the upper thrust bearing.
9. A disc brake, characterized in that: It comprises the rotating shaft assembly and the rotating assembly as described in any one of claims 1 to 8, wherein the rotating shaft assembly is drivingly connected to the adjusting sleeve to drive the adjusting sleeve to rotate.
10. The disc brake according to claim 9, characterized in that It also includes a brake assembly, which is connected to one end of the rotating shaft away from the rotating shaft portion. Rotating the rotating shaft can drive the brake assembly to move in a direction away from the rotating shaft portion.