Tensioner assembly to prevent disintegration

Abstract

The utility model discloses a tensioning wheel assembly for preventing disintegration, comprising a fixed seat, a swing arm and a tensioning wheel installed at the end of the swing arm, and also comprising a central shaft, the front end of the central shaft having a limiting cap, the swing arm being rotatably sleeved in the middle of a central shaft, the tail end of the central shaft having a matching section with an outer diameter smaller than the middle of the central shaft, the matching section being interference-fitted with a sleeve hole on the fixed seat, a torsion spring being further arranged between the swing arm and the fixed seat, a locking bolt passing through the fixed seat and being threadedly connected with the matching section of the central shaft, a circular annular rotation guide groove being arranged at the opening edge of the fixed seat, a guide ring being arranged on the swing arm, the guide ring extending into the rotation guide groove, thus ensuring the reliability of the rotation of the swing arm, two symmetrically arranged arc limiting grooves being arranged on the outer peripheral wall of the rotation guide groove, a limiting screw passing through the arc limiting groove and being threadedly connected with the guide ring, and the nut of the limiting screw being placed in the arc limiting groove. In this way, the technical effect of preventing disintegration is achieved and the reliability of the structure is improved.

Description

Technical Field

[0001] The utility model relates to a transmission component on an automobile engine, in particular to a tension wheel assembly which can prevent the tension wheel from falling apart. Background Art

[0002] The tensioner is a tensioning device for belt transmission. When the center distance of the belt cannot be adjusted, the tensioner can be used to tension the belt. The tensioner is a follower wheel that presses on the belt to change the wrap angle of the pulley or control the tension of the belt. It is a tensioning device for belt transmission.

[0003] The gear train on the engine is driven by a belt, and the tensioner is also in the gear train. Since the operation of the engine will produce angular vibration, the tensioner is needed to suppress the vibration to make the power transmission smoother. The main structure of the existing tensioner assembly includes a fixed seat, a swing arm, and a tensioner installed on the swing arm. A center shaft is interference-fitted with the fixed seat, and the swing arm can be rotatably sleeved on the center shaft. A torsion spring is also arranged between the swing arm and the fixed seat. Under some working conditions where the tensioner has a large transmission force, the interference-fit center shaft is difficult to provide sufficient matching connection guarantee, which can easily lead to the disintegration of the tensioner assembly. Summary of the invention

[0004] In order to solve the above problems, the purpose of the utility model is to provide a tensioning wheel assembly that can prevent disintegration and improve the reliability of the structure.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tensioning wheel assembly for preventing disintegration, comprising a fixed seat, a swing arm and a tensioning wheel installed at the end of the swing arm, and also comprising a center shaft, the front end of the center shaft has a limit cap, the swing arm can be rotatably sleeved on the middle part of a center shaft, the tail end of the center shaft has a matching section with an outer diameter smaller than the middle part of the center shaft, the matching section is interference fit with the sleeve hole on the fixed seat, a torsion spring is also arranged between the swing arm and the fixed seat, a locking bolt passes through the fixed seat and is threadedly connected with the matching section of the center shaft, a circular rotation guide groove is arranged at the opening edge of the fixed seat, a guide ring is provided on the swing arm, the guide ring extends into the rotation guide groove, and a symmetrically arranged arc-shaped limit groove is arranged on the outer peripheral wall of the rotation guide groove, a limit screw passes through the arc-shaped limit groove and is threadedly connected with the guide ring, and the nut of the limit screw is placed in the arc-shaped limit groove.

[0006] The swing arm is provided with a sleeve that is sleeved with the middle part of the central axis, one side of the torsion spring is sleeved on the sleeve, a contact block that contacts one end of the torsion spring is provided on the peripheral wall of the swing arm, a raised cylindrical torsion spring positioning seat is provided on the fixed seat, the other side of the torsion spring is sleeved on the cylindrical torsion spring positioning seat, and a stopper that contacts the other end of the torsion spring is provided on the inner wall of the fixed seat.

[0007] In the structure of the utility model, the matching section on the central shaft has an interference fit with the sleeve hole on the fixed seat, and is then threadedly connected to the central shaft through a locking bolt, which can effectively prevent the swing arm and the fixed seat from detaching, thereby preventing the tensioning wheel assembly from falling apart under large transmission conditions, and the limit screw can further prevent the swing arm from detaching from the fixed seat without affecting the rotation of the swing arm, making the structure more reliable.

[0008] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A three-dimensional diagram of a specific implementation of the utility model;

[0010] Figure 2 It is a cross-sectional view of a specific implementation mode of the utility model;

[0011] Figure 3 for Figure 2 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0012] The present invention is specifically described below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention.

[0013] like Figure 1 — Figure 3 As shown, this embodiment discloses a tensioning wheel assembly for preventing disintegration, including a fixing seat 1, a swing arm 2, and a tensioning wheel 3 installed at the end of the swing arm 2, and also includes a central shaft 4. The structure of the central shaft 4 is similar to that of a bolt. The front end of the central shaft 4 has a limiting cap. The swing arm 2 can be rotatably sleeved in the middle of the central shaft 4. The tail end of the central shaft 4 has a matching section 41 with an outer diameter smaller than the middle of the central shaft 4. The matching section 41 is interference-fitted with the sleeve hole on the fixing seat 1. A torsion spring 5 is also arranged between the swing arm 2 and the fixing seat 1. A locking bolt 6 passes through the fixing seat 1 is threadedly connected with the matching section 41 of the central shaft 4, a circular ring-shaped rotation guide groove 7 is arranged on the opening edge of the fixing seat 1, a guide ring 8 is arranged on the swing arm 2, and the guide ring 8 extends into the rotation guide groove 7, so that the reliability of the rotation of the swing arm 2 can be ensured, and two symmetrically arranged arc-shaped limit grooves 71 are arranged on the outer peripheral wall (i.e., the groove wall) of the rotation guide groove 7, and the arc of the arc-shaped limit groove 71 is about 120°. A limit screw 9 passes through the arc-shaped limit groove 71 and is threadedly connected with the guide ring 8, and the nut of the limit screw 9 is placed in the arc-shaped limit groove 71.

[0014] The swing arm 2 is provided with a sleeve 21 sleeved with the middle of the central shaft 4, one side of the torsion spring 5 is sleeved on the sleeve 21, a contact block in contact with one end of the torsion spring 5 is provided on the peripheral wall of the swing arm 2, a raised cylindrical torsion spring positioning seat 11 is provided on the fixed seat 1, the other side of the torsion spring 5 is sleeved on the cylindrical torsion spring positioning seat 11, and a stopper in contact with the other end of the torsion spring 5 is provided on the inner wall of the fixed seat 1. This structure can make the positioning of the torsion spring 5 more reliable and further improve the reliability of the structure.

[0015] By adopting the above technical solution, the mating section 41 on the central shaft 4 is interference fit with the sleeve hole on the fixed seat 1, and then is threadedly connected to the central shaft 4 through the locking bolt 6, which can effectively prevent the swing arm 2 and the fixed seat 1 from detaching, thereby preventing the tensioning wheel 3 assembly from falling apart under large transmission conditions, and the limit screw 9 can further prevent the swing arm 2 from detaching from the fixed seat 1 without affecting the rotation of the swing arm 2, making the structure more reliable.

Claims

1. A tension wheel assembly to prevent disintegration, comprising a fixed seat, a swing arm and a tension wheel mounted at the end of the swing arm, and also comprising a central shaft, the front end of the central shaft having a limit cap, the swing arm can be rotatably sleeved in the middle of a central shaft, characterized in that: The tail end of the central shaft has a mating section with an outer diameter smaller than that of the middle of the central shaft. The mating section is interference fit with the sleeve hole on the fixed seat. A torsion spring is also arranged between the swing arm and the fixed seat. A locking bolt passes through the fixed seat and is threadedly connected to the mating section of the central shaft. A circular rotation guide groove is arranged on the opening edge of the fixed seat. The swing arm is provided with a guide ring, which extends into the rotation guide groove. The outer peripheral wall of the rotation guide groove is symmetrically provided with arc-shaped limit grooves. A limit screw passes through the arc-shaped limit groove and is threadedly connected to the guide ring. The nut of the limit screw is placed in the arc-shaped limit groove.

2. The tension wheel assembly for preventing disintegration according to claim 1 is characterized in that: The swing arm is provided with a sleeve that is sleeved with the middle part of the central axis, one side of the torsion spring is sleeved on the sleeve, a contact block that contacts one end of the torsion spring is provided on the peripheral wall of the swing arm, a raised cylindrical torsion spring positioning seat is provided on the fixed seat, the other side of the torsion spring is sleeved on the cylindrical torsion spring positioning seat, and a stopper that contacts the other end of the torsion spring is provided on the inner wall of the fixed seat.

Images