CN211398454U

CN211398454U - Tensioner for accessory drive system

Info

Publication number: CN211398454U
Application number: CN201922030300.5U
Authority: CN
Inventors: 卢晶晶
Original assignee: Gates Younita Transmission System Shanghai Co ltd
Current assignee: Gates Younita Transmission System Shanghai Co ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-09-01
Anticipated expiration: 2029-11-19

Abstract

A tensioner for an accessory drive system comprising: a base; the swing arm is arranged on the base and can swing relative to the base, and the swing arm and the base form a containing space; a resilient element for biasing the swing arm such that the swing arm has a tendency to move relative to the base; the belt wheel is rotatably arranged on the swing arm; one end of the damping piece is abutted to the stop block, the stop block is arranged on the swing arm and/or the base, the stop block comprises a base part which is axially combined with the swing arm and/or the base, and a groove is formed in the joint of the base part and the swing arm and/or the base. The combination part of the stop block and the base and/or the swing arm is provided with the groove, so that the stress at the combination part is dispersed, and the stress concentration is reduced.

Description

Tensioner for accessory drive system

Technical Field

The utility model relates to an annex is tensioning ware for transmission system, especially relates to a tensioning ware that engine drive spare tensioning was used.

Background

Automotive engines typically include accessory drive systems, and more accessory drive systems transmit power from the automotive engine through a belt from a main shaft to pulleys connected to various accessories. In such accessory drive systems, one or more tensioners are typically included, which primarily function to provide a certain belt tension to the accessory drive system of the vehicle, so that the belt can smoothly transfer the power of the vehicle engine from the main shaft to the pulleys of the accessories without slipping.

A conventional tensioner for an automotive accessory drive system generally includes a base, a swing arm mounted on the base and pivotable relative to the base, and a spring disposed between the base and the swing arm, wherein one end of the spring is connected to the base, the other end of the spring is connected to a damping member and indirectly acts on the swing arm through the damping member, and one end of the damping member abuts against a stop of the swing arm. The stop block is formed by axially protruding from the main body of the swing arm, the part of the stop block close to the main body of the swing arm is thicker in the radial direction, and the tail end of the axial extension needs to leave a space for accommodating the spring, so that the thickness of the tail end of the axial extension is thinner in the radial direction. When the stop abuts the damper and the force of the damper in the tensioner on the stop is large, the axially extending thinner end of the stop may collapse, resulting in failure of the tensioner.

On the other hand, the joint of the stop block and the swing arm main body is generally small in chamfer angle and concentrated in stress, and after the tensioner works for a long time, the stop block can fail due to fatigue, so that the stop block is broken from the joint of the stop block and the swing arm main body.

In view of the foregoing, there is a need for a new tensioner for an accessory drive system having an improved structure that overcomes the deficiencies of existing tensioners.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a novel annex tensioner for transmission system is provided, its fatigue failure that can avoid the dog.

In order to solve the technical problem, the utility model provides an annex is tensioning ware for transmission system includes: a base; the swing arm is arranged on the base and can swing relative to the base, and the swing arm and the base form a containing space; a resilient element for biasing the swing arm such that the swing arm has a tendency to move relative to the base; the belt wheel is rotatably arranged on the swing arm; one end of the damping piece is abutted to the stop block, the stop block is arranged on the swing arm and/or the base, the stop block comprises a base part which is axially combined with the swing arm and/or the base, and a groove is formed in the joint of the base part and the swing arm and/or the base.

Preferably, the stopper further includes a vertical portion provided radially outward of the base portion and extending axially into the housing space, and the vertical portion has a small thickness in the radial direction.

Preferably, the damping member is a one-piece damping member or a two-piece series arrangement of damping members, or a band-like damping member approximating a ring/C-shape.

Preferably, both ends of the damper are in contact with the stopper and the end of the elastic member, respectively.

Preferably, the damping member is provided with a slot for receiving the end of the resilient element, one end of the damping member abutting against the stop.

Preferably, one end of the elastic element abuts against the stopper.

Preferably, the resilient element is a helical torsion spring.

The utility model discloses the technical scheme who adopts, the dog and base and/or swing arm joint department of annex tensioner for transmission system are provided with the recess, have disperseed the stress of this joint department, have reduced stress concentration.

Drawings

Fig. 1 is an exploded schematic view of a tensioner for an accessory drive system of the present invention.

Fig. 2 is a schematic cross-sectional view of a tensioner for an accessory drive system of the present invention.

Fig. 3 is a schematic perspective view of a swing arm of the tensioner for an accessory drive system according to the present invention.

Detailed Description

Referring to fig. 1, tensioner 20 for an accessory drive system includes a base 22 and a swing arm 24, base 22 being used to secure tensioner 20 to an internal combustion engine, and swing arm 24 being connectable to base 22 by a shaft 25. The shaft 25 may be a separate member, or may be a structure having a shaft function provided on the base 22 and/or the swing arm 24, the shaft 25 having the central axis X, and the swing arm 24 being rotatable relative to the base 22 about the central axis X of the shaft 25. Tensioner 20 for an accessory drive system further includes a pulley 26 rotatably disposed on swing arm 24 for coupling with a drive (not shown). A resilient member 28 is positioned between base 22 and swing arm 24. resilient member 28 is configured to directly or indirectly bias swing arm 24 such that swing arm 24 has a tendency to move relative to base 22. The elastic element 28 may be of various types, such as a helical torsion spring, a leaf spring, etc., which are not listed here. In a preferred embodiment of the present invention, the elastic element 28 is a helical torsion spring 28. A damper 23 is also provided between the elastic element 28 and the swing arm 24. depending on the requirements of the tensioner for an accessory drive system, the damper 23 may be provided as a one-piece damper or a two-piece series arrangement damper, as well as a near-endless or C-shaped band damper, or other structural shape damper. Among the partial products, tensioners having a two-piece damper are particularly useful for damping larger tensioners.

Base 22 and swing arm 24 of tensioner 20 form a housing space 34, and elastic member 28 and damper 23 are housed in housing space 34. The base 22 and/or the swing arm 24 are provided with a stop 27, the damping member 23 and the elastic member 28 are connected in various ways, for example, two ends of the damping member 23 are respectively abutted against the end of the elastic member 28 and the stop 27 on the base 22 and/or the swing arm 24; or the damping member is provided with a slot for receiving the end of the elastic element 28, one end of the damping member abutting against the stop 27; or a damping member is partially disposed between the stopper 27 and the end of the elastic member 28 for transmitting force.

The stopper 27 is provided integrally with the base 22 or the swing arm 24, and the swing arm 24 will be described as an example, and the stopper 27 extends from the cover axial direction of the swing arm 24 to the housing space 34. The stopper 27 includes a base 29 axially coupled to the swing arm 24, and a vertical portion 30 provided radially outside the base 29 and extending axially into the housing space 34. In order to facilitate the passage of the usual helical torsion spring from the stop 27, said vertical portion 30 has a relatively small thickness in the radial direction. In the swing arm 24, a groove 31 is arranged at the joint of the base 29 of the stop 27 and the swing arm 24, when the damping piece 23 abuts against the stop 27, the force exerted on the stop 27 by the damping piece 23 is dispersed through the groove 31, the stress concentration at the joint of the stop 27 and the swing arm 24 is effectively reduced, the damage of the stop 27 caused by the stress concentration is reduced, and the service life of the product is prolonged. Although the above description has been made with reference to the combination of the stopper 27 and the swing arm 24, the stopper may be provided on the base 22, and the stopper may be used to directly abut against the end of the elastic member 28 or the end of the damper 23, that is, the damper 23 may be provided to be engaged with the base 22.

The above lists only some specific implementations according to the purpose of the present invention, and other implementations that can be conceived by those skilled in the art according to the purpose of the present invention without creative work are within the protection scope of the present invention, and are not listed herein.

Claims

1. A tensioner for an accessory drive system comprising: a base; the swing arm is arranged on the base and can swing relative to the base, and the swing arm and the base form a containing space; a resilient element for biasing the swing arm such that the swing arm has a tendency to move relative to the base; the belt wheel is rotatably arranged on the swing arm; damping piece, its one end butt in dog, its characterized in that: and a stop block is arranged on the swing arm and/or the base and comprises a base part axially combined with the swing arm and/or the base, and a groove is arranged at the joint of the base part and the swing arm and/or the base.

2. The tensioner as in claim 1, wherein: the stopper further comprises a vertical portion which is arranged on the radial outer side of the base portion and extends into the accommodating space along the axial direction, and the thickness of the vertical portion in the radial direction is smaller.

3. The tensioner as in claim 1, wherein: the damping member is a one-piece damping member or a two-piece series arrangement of damping members, or a band-like damping member that approximates a ring/C-shape.

4. The tensioner as in claim 3, wherein: the two ends of the damping piece are respectively abutted with the end parts of the stop block and the elastic element.

5. The tensioner as in claim 3, wherein: the damping piece is provided with a groove for accommodating the tail section of the elastic element, and one end part of the damping piece abuts against the stop block.

6. The tensioner as in claim 1, wherein: one end of the elastic element is abutted against the stop block.

7. The tensioner as in claim 1, wherein: the elastic element is a helical torsion spring.