Timing belt idle pulley
By designing an injection molded timing belt idler including pulley, bearing, center sleeve and shaft core, the accuracy reduction and wear problems caused by axial force of the bearing in the prior art are solved, and the stability of the idler is achieved and accuracy, and improve productivity.
Patent Information
- Application Number
- CN202421453761.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-25
AI Technical Summary
When the existing timing belt idler is pressed into the bushing, the bearing will be subjected to a large axial force, which will cause the bearing to change the clearance, reduce the working accuracy, intensify the wear, and affect the stability of the idler.
A timing belt idler including pulley, bearing, center sleeve and shaft core is designed. The complete structure is directly formed by injection molding, which eliminates the process of bushing pressing and avoids the axial force on the bearing. .
Accurate forming and stable connection of bearings is achieved, changes in bearing clearance are avoided, working stability and accuracy of idlers are improved, production processes are saved, and production efficiency is improved.
Smart Images
Figure CN222479378U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile accessories, in particular to a timing belt idler wheel. Background Art
[0002] The timing belt idler is an automotive accessory that acts on the timing belt in the power system of the car. The existing timing belt idler is composed of a pulley, a bearing and a bushing. The pulley is injection molded on the outer ring of the bearing, and the bushing is pressed into the inner ring hole of the bearing and has an interference fit with the inner ring hole of the bearing. When the bushing is pressed, the bearing will be subjected to a large axial force, and the clearance of the bearing will change under the action of the force, resulting in reduced working accuracy of the bearing, increased wear and other problems, which in turn affects the stability of the timing belt idler during operation.
[0003] In view of the above problems, the present invention makes improvements. Utility Model Content
[0004] The utility model provides a timing belt idler wheel, which solves the above problems existing in the prior art during use.
[0005] The technical solution of the utility model is achieved in this way:
[0006] A timing belt idler pulley comprises a pulley and a bearing, wherein the pulley is injection molded on the outer ring of the bearing, and further comprises a center sleeve and an axle core, wherein a center hole having an aperture consistent with the aperture of the inner ring hole of the bearing is opened at the center of the axle core, and the two axle cores are respectively located on the two end surfaces of the bearing and the end surfaces of the axle cores facing the bearing are against the end surface of the inner ring of the bearing, the center hole is aligned with the inner ring hole of the bearing to form a sleeve hole, the center sleeve is injection molded in the sleeve hole and is in close contact with the inner ring of the bearing and the axle core, and a mounting hole is formed in the center sleeve.
[0007] Preferably, a limiting annular groove is provided on the inner wall of the center hole, and a first limiting portion located in the limiting annular groove and in close contact with the limiting annular groove is formed on the center sleeve.
[0008] Preferably, a limiting step is provided on the end of the center hole away from the bearing, a second limiting portion is formed on the end of the center sleeve and is in close contact with the limiting step, and the end face of the center sleeve is flush with the end face of the shaft core away from the bearing.
[0009] Preferably, the center sleeve is injection molded from nylon.
[0010] Preferably, a keyway is formed on the inner wall of the mounting hole and passes through the center sleeve along the axial direction of the center sleeve.
[0011] Preferably, a plurality of hollow holes are provided on the center sleeve.
[0012] Preferably, the hollow holes are distributed on the bottom of the keyway.
[0013] In summary, the beneficial effects of the utility model are that this timing belt idler only needs one injection molding operation to be processed and formed, eliminating the process of bushing press-fitting, saving processes and improving production efficiency, and during processing, no axial force is generated on the bearing to change the bearing clearance, thereby ensuring the smoothness of the relative rotation of the inner and outer rings of the bearing, thereby ensuring the stability and accuracy of the timing belt idler during operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0015] Figure 1 It is a cross-sectional schematic diagram of the utility model;
[0016] Figure 2 It is an exploded schematic diagram of the utility model;
[0017] Figure 3 This is a schematic diagram of the structure of the central axis core of the utility model;
[0018] Figure 4 It is a structural schematic diagram of the center sleeve in the utility model.
[0019] In the figure: 1, pulley; 2, bearing; 3, center sleeve; 31, mounting hole; 32, first limiting portion; 33, second limiting portion; 34, keyway; 35, hollow hole; 4, shaft core; 41, center hole; 42, limiting ring groove; 43, limiting step. DETAILED DESCRIPTION
[0020] The following will be combined with the attached embodiment of the utility model Figure 1-4 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] As shown in the figure, a timing belt idler comprises a pulley 1, a bearing 2, a center sleeve 3 and a shaft core 4, wherein the pulley 1 is injection molded on the outer ring of the bearing 2, and a center hole 41 having an aperture consistent with the aperture of the inner ring hole of the bearing 2 is opened in the center of the shaft core 4, the two shaft cores 4 are respectively located on the two end faces of the bearing 2 and the end faces of the shaft core 4 facing the bearing 2 are against the end faces of the inner ring of the bearing 2, the center hole 41 is aligned with the inner ring hole of the bearing 2 to form a sleeve hole, the center sleeve 3 is injection molded in the sleeve hole and is in close contact with the inner ring of the bearing 2 and the shaft core 4, and a mounting hole 31 is formed in the center sleeve 3.
[0022] Specifically, a limiting annular groove 42 is provided on the inner wall of the center hole 41 , and a first limiting portion 32 located in the limiting annular groove 42 and in close contact with the limiting annular groove 42 is formed on the center sleeve 3 .
[0023] Specifically, a limiting step 43 is provided on the end of the center hole 41 away from the bearing 2, and a second limiting portion 33 is formed on the end of the center sleeve 3 and is in close contact with the limiting step 43. The end face of the center sleeve 3 is flush with the end face of the shaft core 4 away from the bearing 2.
[0024] Specifically, a key groove 34 is formed on the inner wall of the mounting hole 31 and penetrates the center sleeve 3 along the axial direction of the center sleeve 3 .
[0025] Specifically, a sealing ring (not shown in the figure) is arranged between the inner ring and the outer ring of the bearing 2, and the end surface of the shaft core 4 abutting against the inner ring of the bearing 2 is in a boss shape, leaving space for the setting of the sealing ring.
[0026] In the above embodiment, when processing such a timing belt idler, one shaft core 4 and bearing 2 are placed in a static mold of an injection mold so that the center hole 41 is aligned with the inner ring hole of the bearing 2, and another shaft core 4 is placed in a dynamic mold of the injection mold. After the injection mold is closed, the center hole 41 of the other shaft core 4 is aligned with the inner ring hole. After the center holes 41 of the two shaft cores 4 are aligned with the inner ring holes of the bearing 2, a sleeve hole is formed. Then, the pulley 1 and the center sleeve 3 are injection molded on the outer ring of the bearing 2 and in the sleeve hole at one time. After the center sleeve 3 is injection molded in the sleeve hole, the shaft core 4, the center sleeve 3 and the inner ring of the bearing 2 are connected through close contact with the shaft core 4 and the bearing 2, so that the center sleeve 3 and the shaft core 4 can rotate relative to each other with the inner ring of the bearing 2, the outer ring of the bearing 2 and the pulley 1, and the center sleeve is strengthened through the cooperation of the first limiting portion 32 and the limiting ring groove 42 and the second limiting portion 33 and the limiting step 43. 3 and the shaft core 4, so that the center sleeve 3 and the shaft core 4 can rotate more stably with the inner ring of the bearing 2. When installing this timing belt idler, the mounting shaft is passed through the mounting hole 31 of the center sleeve 3 and the timing belt idler is installed on a specified position such as the engine housing, and the keyway 34 on the mounting hole 31 allows the mounting shaft to be key-connected with the center sleeve 3 after being passed through the mounting hole 31, thereby enhancing the stability of the mounting shaft after being connected to the center sleeve 3. It can be seen that through the above structure, this timing belt idler only needs one injection molding operation during processing to be processed and formed, eliminating the process of bushing press-fitting, saving processes and improving production efficiency. In addition, during processing, no axial force is generated on the bearing 2 to change the clearance of the bearing 2, thereby ensuring the smoothness of the relative rotation of the inner and outer rings of the bearing 2, thereby ensuring the stability and accuracy of the timing belt idler during operation.
[0027] Preferably, the center sleeve 3 is injection molded of nylon material. Based on the high strength, high wear resistance and high temperature resistance of nylon material, the installation shaft is passed through the center sleeve to ensure the stability of the timing belt idler pulley after installation, thereby ensuring the durability of the timing belt idler pulley.
[0028] Preferably, a plurality of hollow holes 35 are provided on the center sleeve 3. Specifically, the hollow holes 35 are distributed on the bottom of the keyway 34. By providing the hollow holes 35, the material used in the injection molding of the center sleeve 3 is saved, and the production cost is reduced. By distributing the hollow holes 35 on the bottom of the keyway 34, since the installation shaft is passed through the center sleeve 3 and connected to the center sleeve 3 by a key, the center sleeve 3 is mainly subjected to a circumferential force, thereby ensuring that material is saved without affecting the force strength of the center sleeve 3.
[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A timing belt idler pulley, comprising a pulley (1) and a bearing (2), wherein the pulley (1) is injection molded on an outer ring of the bearing (2), and characterized in that: The invention also comprises a center sleeve (3) and an axial core (4), wherein a center hole (41) having a hole diameter consistent with the hole diameter of the inner ring hole of the bearing (2) is opened at the center of the axial core (4), the two axial cores (4) are respectively located on the two end faces of the bearing (2), and the end faces of the axial cores (4) facing the bearing (2) are against the end faces of the inner ring of the bearing (2), the center hole (41) is aligned with the inner ring hole of the bearing (2) to form a sleeve hole, the center sleeve (3) is injection molded in the sleeve hole and is in close contact with the inner ring of the bearing (2) and the axial core (4), and a mounting hole (31) is formed in the center sleeve (3).
2. A timing belt idler pulley according to claim 1, characterized in that: A limiting annular groove (42) is provided on the inner wall of the center hole (41), and a first limiting portion (32) is formed on the center sleeve (3) and is located in the limiting annular groove (42) and in close contact with the limiting annular groove (42).
3. A timing belt idler pulley according to claim 2, characterized in that: A limiting step (43) is provided on the end of the center hole (41) away from the bearing (2); a second limiting portion (33) is formed at the end of the center sleeve (3) and is located on the limiting step (43) and is in close contact with the limiting step (43); and an end surface of the center sleeve (3) is flush with an end surface of the shaft core (4) away from the bearing (2).
4. The timing belt idler pulley according to claim 1, characterized in that: The center sleeve (3) is injection molded from nylon.
5. The timing belt idler pulley according to claim 1, characterized in that: A keyway (34) is formed on the inner wall of the mounting hole (31) and penetrates the center sleeve (3) along the axial direction of the center sleeve (3).
6. The timing belt idler pulley according to claim 5, characterized in that: The central sleeve (3) is provided with a plurality of hollow holes (35).
7. The timing belt idler pulley according to claim 6, characterized in that: The hollow holes (35) are distributed on the bottom of the key slot (34).