CN211693395U

CN211693395U - Spiral torsion spring and tensioner using same

Info

Publication number: CN211693395U
Application number: CN201922118384.8U
Authority: CN
Inventors: 易志银; 曹阳
Original assignee: Gates Younita Transmission System Shanghai Co ltd
Current assignee: Gates Younita Transmission System Shanghai Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-10-16
Anticipated expiration: 2029-11-26

Abstract

A helical torsion spring and a tensioner using the helical torsion spring comprise a base, a swing arm arranged on the base and capable of swinging around a pivot axis, an accommodating space is arranged between the swing arm and the base, the accommodating space is internally provided with the helical torsion spring and a damping part, the swing arm is also provided with a pulley capable of rotating around a rotation axis, one end of the helical torsion spring is arranged on the base, the other end of the helical torsion spring is matched with the damping part and acts on the swing arm, the helical torsion spring comprises a plurality of spiral coils which axially comprise a last coil and a second spiral coil from the axial end part, the pitch between the last coil and the second spiral coil close to the axial last coil is larger, and after the tensioner is assembled, the second spiral coil of the spring is separated from the damping part and/or the base.

Description

Spiral torsion spring and tensioner using same

Technical Field

The utility model relates to a helical torsion spring and use this helical torsion spring's tight ware that rises especially relate to the tight ware that rises that annex transmission system used on the engine.

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 usually included, and the main function of the tensioner is to provide a certain belt tension to the accessory drive system of the vehicle, so that the belt can smoothly transmit the power of the vehicle engine from the main shaft to the belt pulley of each accessory without slipping.

A conventional tensioner for an automotive accessory drive system generally includes a base, a swing arm mounted on the base and capable of pivoting relative to the base, and a helical torsion spring disposed between the base and the swing arm, wherein one end of the spring is connected to the base, and the other end of the spring is connected to a damping member and acts on the swing arm through the damping member.

The helical torsion spring generally includes a plurality of coils, the pitch between the coils is equal, in practical use, when the tensioner is assembled, the spring is placed in the accommodating space between the base and the swing arm 2, two ends of the spring are respectively jointed with the joint part of the base and/or the damping member, and the base and the swing arm are axially pressed, the joint part of the base and/or the damping member is used for jointing the coil at the axial tail end of the spring, a step-shaped structure is generally formed outside the joint part, and the axial second coil of the spring may interfere and rub with the step-shaped structure due to deformation, so that the torsional characteristics of the spring, such as torque, deflection force and the like, are influenced, and unnecessary noise is generated due to friction.

In view of the foregoing, there is a need for a novel helical torsion spring and tensioner for an accessory drive system using the same, which has an improved structure to overcome the disadvantages of the existing tensioner.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a helical torsion spring and tight ware that rises with improve structure.

In order to solve the technical problem, a helical torsion spring is provided and is installed on a tensioner and used for being matched with a damping part and/or a base of the tensioner, the helical torsion spring comprises a plurality of coils, a last coil and a second coil are axially arranged from an axial end, and after the tensioner is assembled, the pitch of the last coil and the second coil close to the last coil enable the second coil of the spring to be separated from the damping part and/or the base.

A tensioner comprises a base, a swing arm arranged on the base and capable of swinging around a pivot axis, an accommodating space is arranged between the swing arm and the base, a spiral torsion spring and a damping piece are arranged in the accommodating space, a pulley capable of rotating around a rotation axis is further arranged on the swing arm, one end of the spiral torsion spring is arranged on the base, the other end of the spiral torsion spring is matched with the damping piece and acts on the swing arm, the spiral torsion spring comprises a plurality of spiral rings, a last ring and a second spiral ring are axially arranged at the end part of the axial direction, and after the tensioner is assembled, the pitch of the last ring and the second spiral ring close to the last ring of the axial direction enables the second spiral ring of the spring to be separated from the damping piece and/or the base.

The utility model discloses the technical scheme who adopts, through the design of the helical torsion spring of variable pitch, the second helicoidal that makes the spring can not produce with the damping piece and/or the base of the tight ware that rises and interfere, has avoided the noise, can realize the moment of torsion or the deflection force in the design.

Drawings

Fig. 1 is an exploded schematic view of the tensioner of the present invention.

Fig. 2 is a schematic partial cross-sectional view of the coil torsion spring with the damping member and base of the present invention.

Fig. 3 is a schematic view of the helical torsion spring with another angular partial section of the damping member and the base according to the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings.

Referring to fig. 1 to 3, the tensioner 100 of the present invention includes a base 1, disposed on the base 1, and can be provided with an accommodating space around the swing arm 2 of the pivot axis swing between the swing arm 2 and the base 1, a helical torsion spring 3 and a damping member 4 are disposed in the accommodating space, the swing arm 2 is further provided with a pulley 5 for cooperating with a transmission member such as a belt or a chain, and the pulley 5 can rotate around the rotation axis. And one end of the spiral torsion spring 3 is arranged on the base 1, and the other end of the spiral torsion spring is matched with the damping piece 4 and directly or indirectly acts on the swing arm 2 to deflect the swing arm 2 so that the swing arm 2 deflects towards the direction of pressing the transmission piece.

As is conventional, the helical torsion spring 3 comprises a plurality of coils, the

end sections

31, 32 of the axially last coil of which may be circular or linear. The damping member 4 and/or the base 1 are provided with

engaging portions

41, 11 engaging the ends of the helical torsion spring 3, and the

engaging portions

41, 11 may be linear grooves or circular grooves matching the shapes of the

end sections

31, 32 of the spring 3, or may be provided with protrusions matching the end sections of the axial end turns of the helical torsion spring 3. The groove-type joint portion or the protrusion-type joint portion has stepped

portions

42 and 12 formed outside thereof.

In some embodiments, the helical torsion spring 3 includes a last coil, a

second coil

35, 36, a third coil 37, etc. axially inward from an axial end, and the pitch between the axial

last coil

33, 34 and the

second coil

35, 36 close to the axial last coil is larger, so that after the tensioner is assembled, the

second coil

35, 36 is ensured to be separated from the

step portion

42, 12 of the joint portion of the damping member 4 and/or the base 1, that is, the

second coil

35, 36 does not interfere with the

step portion

42, 12.

In some embodiments, referring to fig. 2 and 3, the pitch between the axially

last turns

33, 34 of the helical torsion spring 3 and the

second turns

35, 36 close to the axially

last turns

33, 34 is greater than the pitch between the

second turns

35, 36 and the third turns 37. After the axial compression assembly or torsional deformation of the helical torsion spring 3, there is still a gap between the

second coils

35, 36 and the

stepped portions

42, 12, and there is no interference with the

stepped portions

42, 12, and there is no bridging over the

stepped portions

42, 12, and the torque or deflection force in design can still be achieved.

In some embodiments, the

joints

41 and 11 are only disposed on one of the damping member 4 and the base 1, and the other is configured to cooperate with the end of the spring 3, so as to achieve the convenience of assembling the helical torsion spring 3, the two ends of the spring 3 are still designed symmetrically, that is, the two ends of the spring 3 are configured identically, and the pitch between the two axial end turns 33 and 34 and the

second coils

35 and 36 is greater than the pitch between the

second coils

35 and 36 and the third coils 37, thereby avoiding the problem that the two ends of the spring 3 are configured differently, which results in the need of identifying different end structures during assembling, which increases the manufacturing cost and reduces the assembling efficiency.

The helical torsion spring 3 preferentially allocates the axial distance to the first and second coils at the two axial ends without increasing the overall axial height and causing interference of the middle coil, and in some embodiments, one axial third coil overlaps the other axial third coil.

Above-mentioned technical scheme only is right the utility model discloses an explanation, not right the utility model discloses a restriction, all skilled person in the art basis the utility model discloses an equivalent change that the creation goes on all belongs to the protection scope of the utility model.

Claims

1. A helical torsion spring installs in the tensioner for with the damping piece and/or the base cooperation of tensioner, helical torsion spring includes a plurality of helicoidal, includes last circle, second helicoidal, its characterized in that from axial tip axial: after the tensioner is assembled, the pitch of the final ring and the second coil close to the final ring enable the second coil of the spring to be separated from the damping piece and/or the base.

2. The helical torsion spring according to claim 1, wherein: the spiral torsion spring further comprises a third spiral coil axially inwards from any axial end part, and the pitch between the axial last coil of the spiral torsion spring and the second spiral coil close to the axial last coil is larger than the pitch between the second spiral coil and the third spiral coil.

3. The helical torsion spring according to claim 2, wherein: the structure of the two axial ends of the spiral torsion spring is the same, and the pitch between the two axial end turns and the second spiral turn is larger than that between the second spiral turn and the third spiral turn.

4. The helical torsion spring according to claim 3, wherein: one axial third coil is mutually overlapped with the other axial third coil.

5. The helical torsion spring according to claim 1, wherein: the axially last turn of the helical torsion spring comprises an end section which may be circular or linear.

6. A tensioner, including the base, set up on the base and can be around pivot axis wobbling swing arm, be provided with accommodating space between swing arm and the base, be provided with helical torsion spring and damping piece in the accommodating space, still be provided with on the swing arm and can wind the rotatory pulley of axis of rotation, helical torsion spring one end sets up on the base, and the other end cooperates and acts on the swing arm with damping piece, helical torsion spring includes a plurality of helicoidal, includes last circle, second helicoidal, its characterized in that from axial tip axial: after the tensioner is assembled, the pitch of the final ring and the second coil close to the axial final ring enable the second coil of the spring to be separated from the damping piece and/or the base.

7. The tensioner of claim 6, wherein: the spiral torsion spring further comprises a third spiral coil axially inwards from any axial end part, and the pitch between the axial last coil of the spiral torsion spring and the second spiral coil close to the axial last coil is larger than the pitch between the second spiral coil and the third spiral coil.

8. The tensioner as claimed in claim 7, wherein: the structure of the two axial ends of the spiral torsion spring is the same, and the pitch between the two axial end turns and the second spiral turn is larger than that between the second spiral turn and the third spiral turn.

9. The tensioner of claim 8, wherein: one axial third coil is mutually overlapped with the other axial third coil.

10. The tensioner of claim 6, wherein: the damping piece and/or the base are/is provided with a joint part which is jointed with the end part of the spiral torsion spring, a step part is formed outside the joint part, and after the tensioner is assembled, the second spiral ring is separated from the step part of the joint part of the damping piece and/or the base.

11. The tensioner of claim 10, wherein: the axially last turn of the helical torsion spring comprises a terminal segment and the engagement portion may be a groove or a protrusion that conforms to the shape of the terminal segment.