A cage and a generator unidirectional shock-absorbing pulley

Abstract

This utility model relates to the field of pulley technology, and more particularly to a cage and a generator unidirectional buffer and vibration damping pulley. The cage includes a support column and a limiting ring. One end of the limiting ring is provided with a positioning groove, and at least one limiting boss is provided on the side wall of the positioning groove. The generator unidirectional buffer and vibration damping pulley includes a pulley body, a bearing, a spindle, a friction spring, and a cage. The cage is coaxially disposed between the pulley body and the spindle. One end of the friction spring is provided with a bent portion, and the positioning groove is adapted to the bent portion. When the bent portion is inserted into the positioning groove, the limiting boss and the bent portion are interference-fitted, and the cage and the friction spring are kept relatively fixed in the circumferential direction. The pulley body and the spindle are softly connected. When the rotational speeds of the pulley body and the spindle are not synchronized, buffering and vibration damping can be performed, extending the life of the pulley. At the same time, by providing the limiting boss, the position of the friction spring can be fixed, improving the stability of torque transmission.

Description

Technical Field

[0001] This utility model relates to the field of belt pulley technology, specifically to a cage and a generator unidirectional buffer and vibration damping belt pulley. Background Technology

[0002] When the engine is running, the reciprocating motion of the piston generates periodic torque fluctuations. These fluctuations are transmitted to accessories (such as alternators, water pumps, and air conditioning compressors) via belts, causing unstable loads on the accessories, belt vibration, or noise. The one-way buffer pulley is internally divided into two parts: an outer pulley and an inner pulley, connected by a bearing and spring damping structure. When the engine suddenly decelerates, the outer pulley's speed may momentarily drop below that of the inner pulley (while the accessories continue to rotate due to inertia). At this time, the inner pulley is allowed to rotate freely, preventing the belt from being dragged in the opposite direction, thus buffering the impact.

[0003] In the Chinese Patent Document Database, application number 201721174599.6 discloses a one-way buffer damping pulley for an automotive generator. The cage is fixedly connected to the spindle, and the friction spring is fixedly connected to the cage. However, the friction spring is only positioned by inserting a bent section into the cage, and the connection between the two is not very strong. When the two separate, the pulley body may be unable to transmit power to the spindle, resulting in a malfunction. Utility Model Content

[0004] The purpose of this invention is to provide a cage and a generator unidirectional buffer and vibration damping pulley to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a retainer, comprising a support column extending through both ends and a limiting ring fixed at one axial edge of the support column, wherein one axial end of the limiting ring is provided with a positioning groove, and at least one limiting boss is provided on the side wall of the positioning groove.

[0006] A generator unidirectional buffer vibration damping pulley includes a pulley body, bearings, a spindle, a friction spring, and a cage. The cage is coaxially disposed between the pulley body and the spindle, and both ends of the cage abut against the bearings at both ends. One end of the friction spring is provided with a bent portion, and a positioning groove is adapted to the bent portion. When the bent portion is inserted into the positioning groove, the limiting boss is interference-fitted with the bent portion, and the cage and the friction spring remain relatively fixed in the circumferential direction.

[0007] Furthermore, the inner wall of the pulley body is provided with a cylindrical through hole, the spindle is coaxially mounted at the center inside the pulley body through two sets of bearings, and the two sets of bearings are located at the two ends of the spindle axis, the cage is fixed on the outer peripheral wall of the spindle, and the friction spring is a cylindrical spring, and the outer diameter of the friction spring is larger than the inner hole size of the pulley body.

[0008] Furthermore, a retaining ring is fixedly sleeved on the outer peripheral wall of the support column, and one end of the retaining ring abuts against the limiting ring in the axial direction, which is used to press the bent part into the positioning groove.

[0009] Furthermore, it also includes a positioning mechanism for axially limiting the two sets of bearings.

[0010] Furthermore, the positioning mechanism is a riveted flange at both ends of the pulley body along the axial direction.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The generator unidirectional buffer vibration damping pulley, by setting bearings, spindles, cages and friction springs, makes the connection between the pulley body and the spindle soft. When the speed of the pulley body and the spindle is not synchronized, buffer vibration can be performed, wear can be reduced, and the life of the pulley can be extended. At the same time, by setting limiting bosses and retaining rings on the cage, the positions of the cage and friction springs can be fixed, improving the stability of torque transmission and preventing relative displacement between the friction springs and the cage during operation, which would affect the transmission of torque. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the axial cross-sectional structure of this utility model;

[0013] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the cage of this utility model;

[0015] Figure 4 This is a schematic diagram of the friction spring structure of this utility model.

[0016] In the diagram: 1. Pulley body; 101. Riveted flange; 2. Bearing; 3. Mandrel; 4. Cage; 401. Support column; 402. Limiting ring; 4021. Positioning groove; 4022. Limiting boss; 5. Friction spring; 501. Bending part; 6. Retaining ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances. Furthermore, in the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model.

[0018] Please see Figure 1-4 One embodiment of this utility model is provided: a cage and a generator unidirectional buffer vibration damping pulley. Please refer to [link / reference]. Figure 3 The retainer 4 includes a cylindrical support column 401 that extends through both ends and a limiting ring 402 fixed at one axial edge of the support column 401. The limiting ring 402 extends vertically outward from one edge of the support column 401. A positioning groove 4021 is provided at one axial end of the limiting ring 402. Two limiting bosses 4022 are provided on the side wall of the positioning groove 4021. The number of limiting bosses 4022 is not limited and can be set to other numbers.

[0019] The generator unidirectional damping pulley includes a pulley body 1, a bearing 2, a spindle 3, a cage 4, and a friction spring 5. (See attached diagram.) Figure 1 The inner wall of the pulley body 1 is provided with a cylindrical through hole. The spindle 3 is coaxially mounted at the center of the pulley body 1 through two sets of bearings 2. The two sets of bearings 2 are located at the two ends of the spindle 3 in the axial direction. In this embodiment, each set of bearings 2 is provided with one bearing, and they are all ball bearings. Other quantities and types can also be provided as needed. The outer diameter of the bearings 2 is interference-fitted with the central through hole of the pulley body 1, and the inner diameter of the bearings 2 is interference-fitted with the outer diameter of the spindle 3. The specific structure of the spindle 3 is the prior art. Its center is provided with a mounting hole adapted to the generator shaft. The support column 401 of the retainer 4 is fixed on the outer peripheral wall of the spindle 3 by interference fit. The friction spring 5 is a cylindrical spring, and the outer diameter of the friction spring 5 is larger than the inner hole of the pulley body 1. When the friction spring 5 is inserted into the inner hole of the pulley body 1, the pulley body 1 transmits torque to the friction spring 5 through the friction force generated by the expansion of the outer diameter of the friction spring 5.

[0020] Reference Appendix Figure 1 The outer diameter of the limiting ring 402 of the cage 4 is smaller than the inner diameter of the pulley body 1. The cylindrical support column 401 is interference-fitted with the outer diameter of the spindle 3, which facilitates the cage 4 to be inserted as a whole into the annular cavity formed between the outer ring of the spindle 3 and the inner wall of the pulley body 1.

[0021] In this embodiment, the two ends of the retainer 4 abut against the bearings 2 at both ends to prevent the retainer 4 from moving axially inside the pulley body 1. One end of the friction spring 5 is provided with an arc-shaped bending part 501, and the bending part 501 is adapted to the positioning groove 4021. When the bending part 501 is inserted into the positioning groove 4021, the retainer 4 and the friction spring 5 are kept relatively fixed in the circumferential direction. At the same time, the two limiting bosses 4022 are interference-fitted with the bending part 501 to improve the firmness of the connection between the retainer 4 and the friction spring 5, so that the retainer 4 and the friction spring 5 can rotate synchronously to realize torque transmission. The retainer 4 then transmits the torque to the spindle 3. By setting the retainer 4 and the friction spring 5, the pulley body 1 and the spindle 3 are made to be softly connected. When the speed of the pulley body 1 and the spindle 3 is not synchronized, buffering and vibration reduction can be performed to reduce wear and extend the life of the pulley.

[0022] In this embodiment, a circular retaining ring 6 is fixed on the retainer 4 to limit and fix the friction spring 5 to the retainer 4. The outer diameter of the retaining ring 6 is smaller than the inner diameter of the friction spring 5. (Refer to the attached diagram.) Figure 1 The retaining ring 6 is fixedly sleeved on the outer peripheral wall of the support column 401 by interference fit, and one axial end of the retaining ring 6 abuts against the limiting ring 402, which is used to press the bent part 501 into the positioning groove 4021. This can further improve the firmness of the connection between the retainer 4 and the friction spring 5 and prevent the friction spring 5 and the retainer 4 from separating during transmission.

[0023] Reference Appendix Figure 1-2 A generator unidirectional buffer vibration damping pulley also includes a positioning mechanism for axially limiting the two sets of bearings 2. In this embodiment, the positioning mechanism is the riveted flange 101 at both ends of the pulley body 1, which can prevent the two sets of bearings 2 from moving axially and disengaging from the inner hole of the pulley body 1.

[0024] Working principle: The belt sleeve is connected to the outside of the pulley body 1 to transmit torque to the pulley body 1. The pulley body 1 transmits torque to the friction spring 5 through the friction force generated by the expansion of the outer diameter of the friction spring 5. The friction spring 5 is fixed on the cage 4 and transmits torque to the cage 4. The cage 4 is interference-fitted with the spindle 3 and transmits torque to the spindle 3. The spindle 3 finally transmits torque to the generator shaft. When the engine suddenly decelerates, the speed of the pulley body 1 may momentarily drop below that of the spindle 3. At this time, the spindle 3 is allowed to rotate freely to prevent the belt from being dragged in the opposite direction, thereby buffering the impact.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A retainer comprising a support column (401) with through holes at both ends and a limiting ring (402) fixed at the edge of the axial end of the support column (401), characterized in that: The limiting ring (402) has a positioning groove (4021) at one end in the axial direction, and at least one limiting boss (4022) is provided on the side wall of the positioning groove (4021).

2. A one-way cushioning pulley for a generator, characterized by: The device includes a pulley body (1), a bearing (2), a spindle (3), a friction spring (5), and a retainer (4) as described in claim 1. The retainer (4) is coaxially disposed between the pulley body (1) and the spindle (3), and the two ends of the retainer (4) abut against the bearings (2) at both ends. One end of the friction spring (5) is provided with a bent part (501), and the positioning groove (4021) is adapted to the bent part (501). When the bent part (501) is inserted into the positioning groove (4021), the limiting boss (4022) is interference-fitted with the bent part (501), and the retainer (4) and the friction spring (5) are kept relatively fixed in the circumferential direction.

3. The generator unidirectional buffer vibration damping pulley according to claim 2, characterized in that: The inner wall of the pulley body (1) is provided with a cylindrical through hole. The spindle (3) is coaxially mounted at the center inside the pulley body (1) through two sets of bearings (2), and the two sets of bearings (2) are located at the two ends of the spindle (3) in the axial direction. The retainer (4) is fixed on the outer peripheral wall of the spindle (3). The friction spring (5) is a cylindrical spring, and the outer diameter of the friction spring (5) is larger than the inner hole size of the pulley body (1).

4. The one-way cushioning pulley of claim 2, wherein: A retaining ring (6) is fixedly sleeved on the outer peripheral wall of the support column (401), and one end of the retaining ring (6) abuts against the limiting ring (402) in the axial direction, which is used to press the bent part (501) into the positioning groove (4021).

5. The one-way cushioning pulley of claim 2, wherein: It also includes a positioning mechanism for axially limiting the two sets of bearings (2).

6. The one-way cushioning pulley of claim 5, wherein: The positioning mechanism is the riveted flange (101) at both ends of the pulley body (1) along the axial direction.

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