CN214197130U - Timing tensioner - Google Patents

Abstract

The utility model discloses a tensioning ware in right time, including the base that is fixed in the mount pad with tensioning ware in right time, pass the pivot of base, the cover is established on the pivot and can be around pivot pivoted swing arm, install on the swing arm and can be around swing arm free rotation's band pulley, install helical torsion spring and damping piece between base and swing arm, the damping piece includes the vertical portion of axial extension, damping piece and base relatively fixed, the vertical portion of damping piece is close to the one end of base in the helical torsion spring axial, along helical torsion spring direction of rotation 90 degrees radial orientation helical torsion spring one side of locating, set up the jut with helical torsion spring looks butt. The protrusion stabilizes the contact position of the coil torsion spring and the damping member, and prevents an undesired deviation, so that the damping of the tensioner is stabilized and the tension provided is more stabilized.

Description

Timing tensioner

Technical Field

The utility model relates to a tensioning ware in right time, specially adapted internal-combustion engine's timing drive system.

Background

In order to dampen or dampen vibrations of a drive member in a timing drive system of an internal combustion engine, a timing tensioner is typically provided biased against the drive member, such as a belt or chain. The timing tensioner generally includes a base, a swing arm, a biasing member, typically a coil spring, a pulley. When the tensioner is mounted to an internal combustion engine and the spring contracts and the tensioner is biased against the drive member, the inner wall of the spring will rub against the damping member, providing a radial pressure on the damping member.

However, due to manufacturing, assembly and other reasons, the contact point between the contracted spring and the damping piece is difficult to determine, so that the damping is different in size in the use process, the damping effect cannot be determined, and the tensioning effect of the tensioner is unstable.

A new timing tensioner is therefore needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a timing tensioning ware is provided.

In order to solve the technical problem, the utility model provides a tensioner in right time, include the base that is fixed in the mount pad with tensioner in right time, the pivot, the cover that pass the base establish on the pivot and can wind pivot pivoted swing arm, install in the swing arm and can wind swing arm free rotation's band pulley, install helical torsion spring and damping piece between base and swing arm, helical torsion spring sets up between swing arm and damping piece at axial direction, and its one end is spacing by the base, and the other end is spacing by the swing arm, the damping piece includes axial extension's vertical portion, the radial outside and the helical torsion spring looks butt of vertical portion, the radial inboard and the swing arm looks butt of vertical portion, its characterized in that: the damping piece and the base are relatively fixed, and the vertical part of the damping piece is provided with a protruding part which is abutted against the helical torsion spring at one end of the helical torsion spring, which is close to the base in the axial direction, and radially faces one side of the helical torsion spring along the 90-degree position of the rotation direction of the helical torsion spring.

Preferably, the central angle corresponding to the circumferential arc length of the protrusion is 5 to 40 degrees.

Preferably, the protrusion has a protrusion thickness of 1 to 2 mm with respect to the damping member.

Preferably, the base is provided with a hole or a groove, and one end of the helical torsion spring is disposed in the hole or the groove and is limited by the hole or the groove.

Preferably, the helical torsion spring is in a contracted state after being mounted to the timing tensioner.

Preferably, the damping element further comprises a horizontal portion connected to the vertical portion and extending radially outward, the damping element partially supporting the helical torsion spring in the axial direction.

Preferably, the damping member is provided with a projection abutting against the swing arm radially inwardly at a position corresponding to the projection.

Preferably, the circumferential arc length of the projection is greater than the circumferential arc length of the protrusion.

Preferably, the circumferential arc length of the protrusion corresponds to a central angle greater than 5 degrees and less than 40 degrees.

Preferably, the end of the side of the spiral torsion spring far from the base is matched with the swing arm, and the swing arm is provided with a protrusion at a position of 90 degrees along the extension direction of the spiral torsion spring, and the central angle corresponding to the circumferential arc length of the protrusion is 5-40 degrees.

The beneficial effects of the utility model reside in that: the contact position of the spiral torsion spring and the damping piece can be stabilized through the preset protrusion part, and undesired deviation can not be generated, so that the damping of the tensioner is stabilized, and the provided tension is more stable.

Drawings

FIG. 1 is an exploded schematic view of a timing tensioner.

FIG. 2 is a cross-sectional view of the timing tensioner of FIG. 1.

FIG. 3 is a cross-sectional view of the timing tensioner of FIG. 1 from another perspective.

Detailed Description

The present invention will be described more fully with reference to the timing tensioners shown in figures 1-3.

A timing tensioner is mounted in a timing drive system of an internal combustion engine for tensioning a drive member, such as a belt or chain, in the timing drive system.

The timing tensioner comprises a base 1 that fixes the timing tensioner to a mounting seat, typically an engine; a pivot 2 passing through the base 1, in the present embodiment, the pivot 2 is fixed relative to the base 1, and in other embodiments, the pivot 2 can rotate relative to the base 1; a swing arm 3 which is sleeved on the pivot 2 and can rotate around the pivot; a belt wheel 4 which is arranged on the swing arm 3 and can freely rotate around the swing arm 3; an adjusting member 5; a helical torsion spring 6 mounted between the base 1 and the swing arm 3, and a damper 7 fixed to the base 1. The damping member 7 does not move circumferentially relative to the base. The helical torsion spring 6 is arranged between the swing arm 3 and the damping member 7 in the axial direction, one end of the helical torsion spring is limited by the base 1, and the other end of the helical torsion spring is limited by the swing arm 3.

The base 1 is provided with a hole or a groove, and one end of the helical torsion spring is arranged in the hole or the groove and limited by the hole or the groove.

The swing arm 3 comprises a cylindrical hole 31 for pivotable engagement with the pivot shaft 2, the swing arm 3 further being provided with a cylindrical surface 32 for engagement with the inner cylindrical surface of the pulley, the cylindrical hole 31 being parallel to and offset from the axis of the cylindrical surface 32.

The helical torsion spring 6 is in a contracted state after being mounted to the timing tensioner. When the timing tensioner is operated, the helical torsion spring is always in a contracted state.

The damping member 7 includes a vertical portion 71 extending in the axial direction, and a horizontal portion 72 connected to the vertical portion 71 and extending radially outward, and the damping member 7 axially supports a part of the helical torsion spring 6. In the present invention, the damping member 7 further includes a vertical wall 75 extending upward from the radially outer side of the horizontal portion 72 in substantially parallel with the vertical portion, and the vertical wall 75 is provided with a hole or U-shaped groove 76 through which the lower end portion 62 of the helical torsion spring passes. The circumferential fixing of the damper 7 relative to the base 1 is thus achieved by the lower end 62 of the spring 6. In other designs, the vertical wall 75 does not need to be arranged, but the damping part 7 is directly matched with the base 1 through common combination modes such as gluing, welding and concave-convex matching, so that the damping part 7 and the base 1 are fixed relatively.

The damping member 7 is made of plastic, and is slightly deformed when the helical torsion spring is stressed to twist and radially contract. The vertical portion 71 of the damper 7 is provided with a projection 73 that abuts against the coil torsion spring at one end (i.e., the lower end portion 62) of the coil torsion spring 6 that is axially close to the base, at 90 degrees in the rotational direction of the coil torsion spring, and radially toward the coil torsion spring side. The circumferential arc length of the protruding portion 73 corresponds to a central angle of preferably 5 to 40 degrees. The thickness of the protrusion 73 is 0.5 to 4 mm with respect to the protrusion thickness of the damping member, and preferably, the thickness thereof may be set to 1 to 2 mm. Said damping member 7 is provided radially inwards, in correspondence of the position of the projection 73, with a projection 74 abutting against the swing arm 3. The circumferential arc length of the protruding portion 74 is greater than the circumferential arc length of the protruding portion 73, and the central angle corresponding to the circumferential arc length of the protruding portion is greater than 5 degrees and less than 40 degrees. When the damping member 7 is rubbed against the swing arm 3 for a long time and there is slight abrasion, the protrusion 74 ensures that the abraded damping member 7 can still achieve a preset damping value without large attenuation.

When the vertical portion 71 of the damper 7 is deformed by contracting radially inward, the radially outer side of the vertical portion 71 abuts against the helical torsion spring 6, the radially inner side of the vertical portion 71 abuts against the swing arm 3, the protrusion 73 can ensure that the helical torsion spring 6 always contacts with the damper 7 at a fixed contact portion, i.e., the protrusion 73, and the corresponding protrusion 74 can also ensure that the contact position of the damper 7 with the swing arm 3 is stable without generating an undesired offset. By this time, the damping of the timing tensioner is stable and the tension provided by the entire timing tensioner is more stable.

In the axial direction, an end portion of the helical torsion spring 6 on the side away from the base 1, that is, an upper end portion 61 on the upper side is fitted to the swing arm 3. At a position 90 degrees along the extending direction of the upper end portion 61 of the helical torsion spring 6, the swing arm 3 is provided with a protrusion (not shown) at a side close to the helical torsion spring 6, the circumferential arc length of the protrusion corresponds to a central angle of 5-40 degrees, the thickness of the protrusion is 0.5-4 mm, and the protrusion can effectively improve the contact reliability of the helical torsion spring 6 and the swing arm 3.

The adjuster 5 is used to eccentrically position the center of rotation of the swing arm 3 to properly determine the belt load relative to the range of movement of the swing arm 3.

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 (10)

1. The timing tensioner comprises a base, a pivot, a swing arm, a belt wheel, a spiral torsion spring and a damping piece, wherein the base is used for fixing the timing tensioner on an installation seat, the pivot penetrates through the base, the swing arm is sleeved on the pivot and can rotate around the pivot, the belt wheel is installed on the swing arm and can rotate freely around the swing arm, the spiral torsion spring and the damping piece are installed between the base and the swing arm, the spiral torsion spring is arranged between the swing arm and the damping piece in the axial direction, one end of the spiral torsion spring is limited by the base, the other end of the spiral torsion spring is limited by the swing arm, the damping piece comprises an axially extending vertical part, the radial outer side of the vertical part is abutted against the spiral torsion spring, and the radial inner side of the vertical part is abutted against the swing arm, and the timing tensioner is characterized in that: the damping piece and the base are relatively fixed, and the vertical part of the damping piece is provided with a protruding part which is abutted against the helical torsion spring at one end of the helical torsion spring, which is close to the base in the axial direction, and radially faces one side of the helical torsion spring along the 90-degree position of the rotation direction of the helical torsion spring.

2. The timing tensioner as set forth in claim 1, wherein: the central angle corresponding to the circumferential arc length of the protrusion part is 5-40 degrees.

3. The timing tensioner as claimed in claim 1 or 2, characterized in that: the protrusion has a protrusion thickness of 1-2 mm with respect to the damping member.

4. The timing tensioner as set forth in claim 1, wherein: the base is provided with a hole or a groove, and one end of the spiral torsion spring is arranged in the hole or the groove and limited by the hole or the groove.

5. The timing tensioner as set forth in claim 1, wherein: the helical torsion spring is in a contracted state after being mounted to the timing tensioner.

6. The timing tensioner as set forth in claim 1, wherein: the damping member further includes a horizontal portion connected to the vertical portion and extending radially outward, the damping member supporting the helical torsion spring in an axially upper portion.

7. The timing tensioner as set forth in claim 1, wherein: the damping piece is provided with a protrusion part which is abutted against the swing arm and is arranged radially inwards corresponding to the position of the protrusion part.

8. The timing tensioner as set forth in claim 7, wherein: the projection has a circumferential arc length greater than a circumferential arc length of the projection.

9. The timing tensioner as set forth in claim 8, wherein: the central angle corresponding to the circumferential arc length of the protruding part is more than 5 degrees and less than 40 degrees.

10. The timing tensioner as set forth in claim 1, wherein: the end part of one side of the spiral torsion spring, which is far away from the base, is matched with the swing arm, a protrusion is arranged on one side of the swing arm, which is close to the spiral torsion spring, at a position of 90 degrees along the extension direction of the spiral torsion spring, and the central angle corresponding to the circumferential arc length of the protrusion is 5-40 degrees.

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