Automatic tensioning wheel of elastic damping unit

Abstract

The utility model discloses an automatic tensioning wheel of an elastic damping unit. Comprising a wheel rocker arm, an elastic damping unit, a mandrel and a base, a damping functional surface is arranged on the wheel rocker arm, a shaft hole is formed in the center of the damping functional surface, the core shaft is arranged in the shaft hole in a penetrating manner, the front end of the core shaft extends out of the shaft hole, and the base is connected with the front end of the core shaft and is connected with the wheel rocker arm; the elastic damping unit is arranged on the damping functional surface, and the elastic damping unit is fixedly arranged on the mandrel in a sleeving manner; the elastic damping unit is a belleville spring coated with damping materials, the bowl-shaped face of the belleville spring faces the damping function face, the belleville spring is pressed downwards along with the mandrel, the bowl-shaped face of the belleville spring makes contact with the damping function face, and mechanical friction damping is generated through circumferential relative friction between the bowl-shaped face of the belleville spring and the damping function face. According to the utility model, the number of parts is reduced, the manufacturing cost is reduced, and the reliability is improved.

Description

Technical fields:

[0001] This utility model belongs to the technical field of automatic tensioner design for internal combustion engine accessory belt systems, and specifically relates to an automatic tensioner with an elastic damping unit. Background technology:

[0002] Automatic tensioners are a crucial component of internal combustion engine accessory belt systems. Existing automatic tensioners typically employ a damping mechanism comprising three to five parts, often including a separate cover plate, damping unit, and spring mechanism. The matching design and manufacturing of the damping mechanism are achieved through assembly, resulting in a complex structure, large installation space requirements, high manufacturing costs, and low reliability. Therefore, simplifying the design and manufacturing of the damping mechanism, reducing manufacturing costs, and improving the reliability of automatic tensioners are problems that need to be addressed.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content:

[0004] The purpose of this invention is to provide an automatic tensioning wheel for an elastic damping unit, thereby overcoming the defects in the prior art.

[0005] To achieve the above objectives, this utility model provides an automatic tensioning wheel with an elastic damping unit, comprising a wheel rocker arm, an elastic damping unit, a spindle, and a base. The wheel rocker arm has a damping functional surface with a shaft hole at its center. The spindle passes through the shaft hole, with its front end extending outside the hole. The base is connected to the front end of the spindle and to the wheel rocker arm. The elastic damping unit is disposed on the damping functional surface and is mounted on the spindle. The elastic damping unit is a butterfly spring coated with damping material, with its cup-shaped surface facing the damping functional surface. As the spindle presses down, the cup-shaped surface of the butterfly spring contacts the damping functional surface, generating mechanical friction damping through circumferential relative friction between them.

[0006] Preferably, in the technical solution, a racetrack-shaped hole is provided at the center of the elastic damping unit, and the racetrack-shaped hole is aligned with the shaft hole; the mandrel includes a bearing seat, a shaft body, and a positioning block, with a positioning block provided at the center of the bearing seat, and the shaft body provided on the positioning block. The positioning block is racetrack-shaped, and its size matches the racetrack-shaped hole of the elastic damping unit; the mandrel is connected and fixed to the elastic damping unit, with the bearing seat located outside the cup-shaped surface of the butterfly spring, and the shaft body and positioning block located inside the cup-shaped surface of the butterfly spring.

[0007] Preferably, in the technical solution, the end of the shaft has a knurled structure, and the end of the shaft and the base are interference fit; the end of the shaft is pressed into the base to form a rigid connection.

[0008] Preferably, in the technical solution, a friction pad is provided at the connection between the wheel rocker arm and the base.

[0009] Preferably, in the technical solution, a bushing is provided in the shaft hole, and the bushing is fitted onto the mandrel.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] By simplifying the original damping mechanism into an elastic damping unit, the number of parts is reduced, manufacturing costs are lowered, and reliability is improved while maintaining the original damping mechanism's functionality. Attached image description:

[0012] Figure 1 This is a schematic diagram of the automatic tensioning wheel structure of the elastic damping unit of this utility model;

[0013] Figure 2 This is a sectional view of the automatic tensioning wheel of the elastic damping unit of this utility model before pressing.

[0014] Figure 3 This is a cross-sectional view of the automatic tensioning wheel of the elastic damping unit of this utility model after pressing.

[0015] Figure 4 This is a schematic diagram of the elastic damping unit structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the mandrel structure of this utility model. Detailed implementation method:

[0017] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0018] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0019] like Figure 1-2 As shown, an automatic tensioning wheel with an elastic damping unit includes a wheel rocker arm 1, an elastic damping unit 2, a spindle 3, and a base 4. The wheel rocker arm 1 has a damping functional surface 10, a shaft hole 11 at the center of the damping functional surface 10, and a bushing 12 disposed in the shaft hole 11. The spindle 3 passes through the shaft hole 11, and the bushing 12 is fitted onto the spindle 3. Figure 5As shown, the spindle 3 includes a bearing seat 30, a shaft body 31, and a positioning block 32. The positioning block 32 is located at the center of the bearing seat 30, and the shaft body 31 is mounted on the positioning block 32. The shaft body 31 extends outside the shaft hole 11. A base hole 40 is provided inside the base 4, connecting the base hole 40 to the shaft body 31. The end of the shaft body 31 has a knurled structure, and the end of the shaft body 31 is press-fitted with the base hole 40. The base 4 is connected to the wheel rocker arm 1, and a friction pad 5 is provided at the connection between the wheel rocker arm 1 and the base 4. The elastic damping unit 2 is mounted on the damping functional surface 10, as shown... Figure 4 As shown, the elastic damping unit 2 is a butterfly spring coated with damping material. The cup-shaped surface 20 of the butterfly spring faces the damping functional surface 10. A racetrack-shaped hole 21 is provided at the center of the butterfly spring. The racetrack-shaped hole 21 is aligned with the shaft hole 11. The positioning block 32 is racetrack-shaped. The size of the positioning block 32 matches the racetrack-shaped hole 21 of the elastic damping unit 2. The spindle 3 is connected and fixed to the elastic damping unit 2. The bearing seat 30 is located outside the cup-shaped surface 20 of the butterfly spring. The shaft body 31 and the positioning block 32 are located inside the cup-shaped surface 20 of the butterfly spring.

[0020] After assembly, a pressing process is performed. The mandrel 3 is pressed down, and the disc spring is pressed down along with it. The cup-shaped surface 20 of the disc spring is flattened, and the cup-shaped surface 20 contacts the damping functional surface 10. The end of the shaft 31 is fully pressed into the base hole 40 to form a rigid connection. Figure 3 As shown, the deformation of the disc spring generates the axial clamping force required for damping. During the swing of the wheel rocker arm 1, the spindle 3, the elastic damping unit 2, and the base 4 remain stationary through cooperation and connection. The damping functional surface 10 of the wheel rocker arm 1 and the disc spring cup-shaped surface 20 of the elastic damping unit 2 achieve circumferential relative friction, generating mechanical friction damping. By simplifying the original damping mechanism to the elastic damping unit 2, the number of parts is reduced, manufacturing costs are lowered, and reliability is improved while maintaining the functions of the original damping mechanism.

[0021] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. An automatic tensioning wheel for an elastic damping unit, characterized in that: The device includes a wheel rocker arm, an elastic damping unit, a spindle, and a base. The wheel rocker arm has a damping functional surface with a shaft hole at its center. The spindle passes through the shaft hole, with its front end extending outside the hole. The base is connected to the front end of the spindle and to the wheel rocker arm. The elastic damping unit is disposed on the damping functional surface and is mounted on the spindle. The elastic damping unit is a butterfly spring coated with damping material, with its cup-shaped surface facing the damping functional surface. As the spindle presses down, the cup-shaped surface of the butterfly spring contacts the damping functional surface, generating mechanical friction damping through circumferential relative friction.

2. The automatic tensioning wheel of the elastic damping unit according to claim 1, characterized in that: The elastic damping unit has a racetrack-shaped hole at its center, which is aligned with the shaft hole. The spindle includes a bearing seat, a shaft body, and a positioning block. The positioning block is located at the center of the bearing seat, and the shaft body is mounted on the positioning block. The positioning block is racetrack-shaped, and its size matches the racetrack-shaped hole of the elastic damping unit. The spindle is connected and fixed to the elastic damping unit. The bearing seat is located outside the cup-shaped surface of the disc spring, while the shaft body and positioning block are located inside the cup-shaped surface of the disc spring.

3. The automatic tensioning wheel of the elastic damping unit according to claim 2, characterized in that: The end of the shaft has a knurled structure, and the end of the shaft is press-fitted into the base to form a rigid connection.

4. The automatic tensioning wheel of the elastic damping unit according to claim 1, characterized in that: Friction pads are provided at the connection between the wheel rocker arm and the base.

5. The automatic tensioning wheel of the elastic damping unit according to claim 1, characterized in that: A bushing is provided in the shaft hole, and the bushing is fitted onto the mandrel.

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