Belt pulley gear shaft assembly

Abstract

The utility model provides a belt pulley gear shaft assembly which comprises a gear shaft body, a left bush and a right bush, the left bush and the right bush are arranged on the gear shaft body in a sleeving mode, a partition part is arranged on the outer wall of the middle of the gear shaft body, the left bush and the right bush are arranged on the two sides of the partition part respectively, and a right baffle ring is arranged at the end, close to the left bush, of the right bush. A left baffle ring is arranged at one end, close to the right bushing, of the left bushing; grooves are formed in the positions, corresponding to the blocking parts, of the left bushing and the right bushing, so that the blocking parts are located on the inner sides of the two bushings, and the left baffle ring is tightly attached to the right baffle ring; a first bearing positioning table is arranged at the end, different from the right bush, of the left bush, and a second bearing positioning table is arranged at the end, different from the left bush, of the right bush. The left bush and the right bush are positioned through the partition part on the gear shaft, the bush structure stability is good, the left bush and the right bush are provided with the baffle rings for limiting the friction spring respectively, the stability of the friction spring is kept, the bushes can effectively support the friction spring, replacement can be convenient after abrasion, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of pulley transmission, and in particular relates to a pulley gear shaft assembly. Background Art

[0002] Traditional automobile generator pulleys all run synchronously with the speed of the automobile engine. When the engine speed changes, the speed of the generator will also change. Therefore, when the engine suddenly accelerates or decelerates, the speed of the generator pulley also changes. However, due to the effect of inertia, the speed of the generator rotor is instantly out of sync with the engine speed, and an impact will be formed between the transmission belt and the pulley, reducing the life of the belt, generating noise, and reducing the life of the entire gear train. At the moment before the engine stops working, the engine crankshaft has a short forward and reverse swing, and the excitation coil in the rotor is damaged by the centrifugal force, reducing the life of the generator. In the prior art, there is a design that expands and contracts the outer ring of the friction spring to clamp and disengage the pulley body, thereby achieving a better buffering effect. When the pulley body rotates faster than the gear shaft, the outer ring of the friction spring expands and clamps the pulley body, combining the gear shaft and the pulley body into one, so that the gear shaft and the pulley body rotate synchronously and transmit driving power; when the pulley body rotates slower than the gear shaft, the outer ring of the friction spring shrinks and starts to slip in the shaft hole of the pulley body, disengaging the gear shaft and the pulley body, so that the gear shaft and the pulley body rotate separately, playing a protective and buffering role. However, in this type of solution, a spring retainer needs to be separately set on the outside of the gear shaft, which has a complex structure and poor stability of the friction spring, especially when a buffer groove is opened on the inner wall of the relatively weak position of the pulley body, which reduces the structural strength of the pulley body and easily causes damage to the pulley when the load is large. Therefore, it is necessary to make improvements. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and provides a pulley and gear shaft assembly.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A pulley gear shaft assembly comprises a gear shaft body, and a left bushing and a right bushing which are sleeved on the gear shaft body; a baffle portion is provided on the outer wall of the middle portion of the gear shaft body; a left bushing and a right bushing are respectively placed on both sides of the baffle portion; a right baffle ring is provided at one end of the right bushing close to the left bushing, and a left baffle ring is provided at one end of the left bushing close to the right bushing; grooves are provided on the left and right bushings corresponding to the position of the baffle portion, so that the baffle portion is located on the inner sides of the two bushings, and the left baffle ring is tightly attached to the right baffle ring; a first bearing positioning platform is provided at one end of the left bushing different from the right bushing, and a second bearing positioning platform is provided at one end of the right bushing different from the left bushing.

[0006] Furthermore, the left retaining ring and the left bushing are an integrally formed structure.

[0007] Furthermore, the right retaining ring and the right bushing are an integrally formed structure.

[0008] Furthermore, the left bushing and the right bushing are both screwed onto the gear shaft body.

[0009] Furthermore, the inner walls of the left and right bushings are both provided with internal threads, the left side of the barrier portion is provided with a left external connecting thread that cooperates with the left bushing, and the right side of the barrier portion is provided with a right external connecting thread that cooperates with the right bushing.

[0010] Furthermore, the right end surface of the left bushing and the left end surface of the right bushing are both provided with spring grooves for fixing the friction springs.

[0011] Furthermore, each corner portion of the left and right bushings is chamfered.

[0012] Furthermore, the gear shaft body is made of 20CrMnTi material, and the left and right bushings are made of 45 steel.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] In the invention, the left and right bushings are positioned by the blocking portion on the gear shaft, and the bushing structure has good stability. The left and right bushings are respectively provided with blocking rings for limiting the friction springs to maintain the stability of the friction springs. The bushings can effectively support the friction springs, and even if the bushings are worn out after long-term use, they can be easily replaced, and the use and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the structure created by the present invention;

[0017] Figure 2 A schematic diagram of the gear shaft portion in the invention;

[0018] Figure 3 A schematic diagram of a left bushing in the invention;

[0019] Figure 4 It is a schematic diagram of the right bushing in the present invention. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] A belt pulley and gear assembly, such as Figures 1 to 4 As shown, it includes a gear shaft body 1, and a left bushing 2 and a right bushing 3 sleeved on the gear shaft body. A baffle 4 is provided on the outer wall of the middle part of the gear shaft body. The left and right bushings are respectively placed on both sides of the baffle, and a right baffle ring 5 is provided at one end of the right bushing close to the left bushing, and a left baffle ring 6 is provided at one end of the left bushing close to the right bushing; the left and right bushings are provided with grooves corresponding to the baffle positions, so that the baffle is located inside the two bushings, and the left baffle ring is tightly attached to the right baffle ring; the end of the left bushing different from the right bushing is provided with a first bearing positioning platform 7, and the end of the right bushing different from the left bushing is provided with a second bearing positioning platform 8. The first and second bearing positioning platforms are respectively used to abut against the inner rings of the corresponding side bearings of the pulley to ensure stable operation of the bearings.

[0025] The left retaining ring and the left bushing are an integrally formed structure. The right retaining ring and the right bushing are an integrally formed structure. The left bushing and the right bushing are both threadedly screwed on the gear shaft body. Specifically, the inner walls of the left bushing and the right bushing are both provided with internal threads, the left side of the baffle is provided with a left external connecting thread 9 that cooperates with the left bushing, and the right side of the baffle is provided with a right external connecting thread 10 that cooperates with the right bushing.

[0026] The right end surface of the left bushing and the left end surface of the right bushing are both provided with spring grooves for fixing the friction spring. The edges and corners of the left and right bushings are chamfered. The gear shaft body is made of 20CrMnTi material, and the left and right bushings are made of 45 steel.

[0027] In the invention, the left and right bushings are positioned by the blocking portion on the gear shaft, and the bushing structure has good stability. The left and right bushings are respectively provided with blocking rings for limiting the friction springs to maintain the stability of the friction springs. The bushings can effectively support the friction springs, and even if the bushings are worn out after long-term use, they can be easily replaced, and the use and maintenance costs are low.

[0028] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulley and gear assembly, characterized in that: It includes a gear shaft body, and a left bushing and a right bushing which are mounted on the gear shaft body. A baffle portion is provided on the outer wall in the middle of the gear shaft body. The left and right bushings are respectively placed on both sides of the baffle portion, and a right baffle ring is provided at one end of the right bushing close to the left bushing, and a left baffle ring is provided at one end of the left bushing close to the right bushing. The left and right bushings are both provided with grooves corresponding to the positions of the baffle portions, so that the baffle portions are located on the inner sides of the two bushings, and the left baffle ring is tightly attached to the right baffle ring. A first bearing positioning platform is provided at one end of the left bushing different from the right bushing, and a second bearing positioning platform is provided at one end of the right bushing different from the left bushing.

2. A pulley and gear assembly according to claim 1, characterized in that: The left retaining ring and the left bushing are an integrally formed structure.

3. A pulley and gear assembly according to claim 1, characterized in that: The right retaining ring and the right bushing are an integrally formed structure.

4. A pulley and gear assembly according to claim 1, characterized in that: The left bushing and the right bushing are both screwed on the gear shaft body.

5. A pulley and gear assembly according to claim 4, characterized in that: The inner walls of the left bushing and the right bushing are both provided with internal threads, the left side of the baffle portion is provided with a left external connecting thread matched with the left bushing, and the right side of the baffle portion is provided with a right external connecting thread matched with the right bushing.

6. A pulley and gear assembly according to claim 1, characterized in that: The right end surface of the left bushing and the left end surface of the right bushing are both provided with spring grooves for fixing the friction springs.

7. The pulley and gear assembly according to claim 1, characterized in that: The corners of the left and right bushings are chamfered.

8. The pulley and gear assembly according to claim 1, characterized in that: The gear shaft body is made of 20CrMnTi material, and the left and right bushings are made of 45 steel.

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