CN112483611A

CN112483611A - Double arm tensioner

Info

Publication number: CN112483611A
Application number: CN202011415278.7A
Authority: CN
Inventors: 魏玉明; 郑炼; 周敬尧; 韦懿庭
Original assignee: Dongfeng Motor Co Ltd
Current assignee: Dongfeng Motor Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-03-12
Anticipated expiration: 2040-12-04
Also published as: CN112483611B

Abstract

The invention discloses a double-arm tensioner which comprises a shell, a left tensioning arm, a right tensioning arm, a cover plate, a first tensioning wheel and a second tensioning wheel, wherein the left tensioning arm and the right tensioning arm are circular and are coaxially arranged, the left tensioning arm and the right tensioning arm are installed between the shell and the cover plate, the first tensioning wheel is installed on the left tensioning arm, the second tensioning wheel is installed on the right tensioning arm, and an adjustable damping structure is arranged between the left tensioning arm and the right tensioning arm. In some embodiments of the invention, because the left tensioning arm and the right tensioning arm are circular and coaxially arranged, the occupied space is small during working; and be equipped with adjustable damping structure between left tensioning arm and the right tensioning arm, after the damping wearing and tearing, can increase the damping through adjusting.

Description

Double arm tensioner

Technical Field

The invention relates to the technical field of automobiles, in particular to a double-arm tensioner.

Background

One type of existing tensioner: the volume is larger; the swing of the tensioning arm is large, and the space required by the working range is large; when the ENG starts, the belt is easy to fall off, noise is generated, NVH performance is poor, and the risk of belt falling off exists.

Another tensioner is available: the cost of the plate spring is high; the inner part of the tensioner is not provided with a disc spring, friction torque is generated by pretightening force, the damping is small, the swing amplitude of the tensioner is large, the idling NVH performance is poor, and the belt is separated from the tensioner; after the durability, the damping wear amount cannot be supplemented, and NVH is further deteriorated.

Therefore, there is a need for a dual arm tensioner having a large damping value, improved NVH performance, and which occupies a small space during operation and prevents belt slip.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a double-arm tensioner which has a large damping value, can improve NVH (noise, vibration and harshness) performance, occupies a small space during working and prevents a belt from being pulled out.

The technical scheme of the invention provides a double-arm tensioner, which comprises a shell, a left tensioning arm, a right tensioning arm, a cover plate, a first tensioning wheel and a second tensioning wheel, wherein the left tensioning arm and the right tensioning arm are annular and are coaxially arranged, the left tensioning arm and the right tensioning arm are installed between the shell and the cover plate, the first tensioning wheel is installed on the left tensioning arm, the second tensioning wheel is installed on the right tensioning arm, and an adjustable damping structure is arranged between the left tensioning arm and the right tensioning arm.

Further, the adjustable damping structure includes a male member mounted inside the right tensioner arm and a female member mounted inside the left tensioner arm, the male member being inserted into the female member.

Further, the adjustable damping structure further comprises an adjusting member inserted into the cover plate and the housing for adjusting a distance between the male member and the female member.

Further, the cross section of the convex part is trapezoidal, U-shaped or V-shaped.

Further, the first tensioning wheel is mounted inside the left tensioning arm, the second tensioning wheel is mounted inside the right tensioning arm, and the first tensioning wheel and the second tensioning wheel are arranged opposite to each other.

Further, two spiral springs are arranged in the adjustable damping structure.

Furthermore, a spiral groove is formed in the adjustable damping structure, and one end of the spiral spring is fixed in the spiral groove.

Further, the dual-arm tensioner further includes a first damping member disposed between the housing and the left tensioning arm and a second damping member disposed between the right tensioning arm and the cover plate.

Furthermore, the outer side walls of the convex part and the concave part, which are contacted with the first damping part, are provided with first guide-out grooves;

and a second guide-out groove is formed in the outer side wall, in contact with the second damping part, of the right tensioning arm.

Furthermore, a gasket is arranged at the joint of the cover plate and the shell, and the gasket is of a non-closed-loop structure.

After adopting above-mentioned technical scheme, have following beneficial effect:

in some embodiments of the invention, because the left tensioning arm and the right tensioning arm are circular and coaxially arranged, the occupied space is small during working; and be equipped with adjustable damping structure between left tensioning arm and the right tensioning arm, after the damping wearing and tearing, can increase the damping through adjusting.

In other embodiments of the present invention, a greater frictional force may be generated between the male member and the female member at the same pressure, thereby increasing the damping value and improving NVH performance.

In other embodiments of the invention, the first tensioning wheel and the second tensioning wheel are oppositely arranged, so that the belt can be arranged between the left tensioning arm and the right tensioning arm, the belt is limited, and the belt is prevented from being separated.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

FIG. 1 is a perspective view of a dual arm tensioner in one embodiment of the present invention;

FIG. 2 is a front view of a dual arm tensioner in one embodiment of the present invention;

FIG. 3 is a cross-sectional view taken at A-A in FIG. 2;

FIG. 4 is a schematic view of a left tensioning arm in combination with a right tensioning arm in accordance with an embodiment of the present invention;

FIG. 5 is an exploded view of the left and right tensioning arms in one embodiment of the present invention;

FIG. 6 is a schematic view of a left tensioning arm in combination with a right tensioning arm in another embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of the female member in an embodiment of the present invention;

FIG. 8 is a schematic view of a gasket in accordance with an embodiment of the present invention;

FIG. 9 is a schematic of a dual arm tensioner in a rest position in accordance with an embodiment of the present invention;

FIG. 10 is a schematic of a dual arm tensioner in a power assist or motor activated state in accordance with an embodiment of the present invention;

FIG. 11 is a schematic illustration of a dual arm tensioner in an electric power generation or energy recovery or engine start-up condition in accordance with an embodiment of the present invention;

fig. 12 is an exploded view of a dual arm tensioner in one embodiment of the present invention.

Reference symbol comparison table:

the device comprises a shell 1, a left tensioning arm 2, a right tensioning arm 3, a cover plate 4, a first tensioning wheel 5, a second tensioning wheel 6 and a second guide-out groove 31;

adjustable damping structure 7: a male member 71, a female member 72, an adjusting member 73, a coil spring 74, a spiral groove 75, a spring groove 721, a first lead-out groove 711, a first lead-out groove 721;

first damping member 8, second damping member 9, gasket 10, and belt 100.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings.

It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

In an embodiment of the present invention, as shown in fig. 1-3, the dual-arm tensioner includes a housing 1, a left tensioning arm 2, a right tensioning arm 3, a cover plate 4, a first tensioning wheel 5 and a second tensioning wheel 6, the left tensioning arm 2 and the right tensioning arm 3 are circular and coaxially arranged, the left tensioning arm 2 and the right tensioning arm 3 are installed between the housing 1 and the cover plate 4, the first tensioning wheel 5 is installed on the left tensioning arm 2, the second tensioning wheel 6 is installed on the right tensioning arm 3, and an adjustable damping structure 7 is provided between the left tensioning arm 2 and the right tensioning arm 3.

Specifically, as shown in fig. 1, the housing 1 is a semicircular housing, and a semicircular cavity is formed in the housing 1. The cover plate 4 is a semicircular plate, and the cover plate 4 covers the housing 1 and is used for enclosing the left tensioning arm 2 and the right tensioning arm 3 in the cavity.

The left tensioning arm 2 is annular, the right tensioning arm 3 is also annular, and the left tensioning arm and the right tensioning arm are coaxially arranged; the centers of the circle of the shell 1 and the cover plate 4 are on the same axis with the centers of the circle of the left tensioning arm 2 and the circle of the right tensioning arm 3. When the left tensioning arm 2 and the right tensioning arm 3 move, the left tensioning arm and the right tensioning arm rotate around the central axis of the left tensioning arm and the right tensioning arm, and no extra space is occupied during work.

As shown in fig. 3, an adjustable damping structure 7 is provided between the left and right tensioning

arms

2, 3.

Specifically, as shown in fig. 4, the adjustable damping structure 7 is disposed between the upper semi-circles of the left tensioning arm 2 and the right tensioning arm 3, and the lower semi-circles of the left tensioning arm 2 and the right tensioning arm 3 are spaced apart by a certain distance for mounting the first tensioning wheel 5 and the second tensioning wheel 6.

The adjustable damping structure 7 is capable of adjusting the damping value. When the damping piece is worn, the damping value can be increased through adjustment, the whole tensioner does not need to be replaced, and the service life of the tensioner is prolonged.

Further, as shown in fig. 3 to 4, the adjustable damping structure 7 includes a male member 71 and a female member 72, the male member 71 being installed inside the right tensioner arm 3, the female member 72 being installed inside the left tensioner arm 2, the male member 71 being inserted into the female member 72.

Specifically, a male member 71 extends from the inner side of the right tensioner arm 3 toward the left tensioner arm 2, and a female member 72 is provided on the inner side of the left tensioner arm 2. The male member 71 is inserted into the female member 72 with contact therebetween. When the left and

right tensioner arms

2 and 3 are relatively rotated, a frictional force is generated between the male member 71 and the female member 72. Since the male member 71 and the female member 72 are under the same pressure, a larger frictional force can be generated, thereby making the damping value larger and improving the NVH performance of the tensioner.

Preferably, female member 72 is integral with left tensioning arm 2 and male member 71 is integral with right tensioning arm 3. During installation, the left tensioning arm 2 and the right tensioning arm 3 are buckled, and the male part 71 is inserted into the female part 72.

Alternatively, the male member 71 and the female member 72 may be made of a resin material, and the left tensioner arm 2 and the right tensioner arm 3 may be made of a metal material.

In this embodiment, as shown in fig. 3, the cross section of the male member 71 is trapezoidal, and the cross section of the corresponding female member 72 is trapezoidal.

Alternatively, the cross section of the male member 71 may be U-shaped or V-shaped, the female member 72 is designed as a correspondingly shaped groove structure, and the male member 71 is inserted into the female member 72 with a large contact force therebetween.

Further, as shown in fig. 3, the adjustable damping structure 7 further includes an adjusting member 73, and the adjusting member 73 is inserted into the cover plate 4 and the housing 1 for adjusting the distance between the male member 71 and the female member 72.

In this embodiment, the adjusting member 73 is a bolt, which is inserted between the cover plate 4 and the housing 1, for fastening the cover plate 4 and the housing 1, and pressing the male member 71 and the female member 72.

When the contact surfaces of the male member 71 and the female member 72 are worn to generate a gap, the damping value is lowered. The male member 71 and the female member 72 are compressed again by the adjusting bolt, increasing the damping value.

Further, as shown in fig. 4 to 5, a first tension pulley 5 is installed inside the left tension arm 2, a second tension pulley 6 is installed inside the right tension arm 3, and the first tension pulley 5 is disposed opposite to the second tension pulley 6.

In the present embodiment, the first tension pulley 5 and the second tension pulley 6 are disposed at opposite sides, and as shown in fig. 9, when the belt 100 is wound around the first tension pulley 5 and the second tension pulley 6, the belt 100 is confined between the left tension arm 2 and the right tension arm 3, preventing the belt 100 from being released. Meanwhile, the arrangement mode reduces the occupied space.

Further, as shown in fig. 7 and 12, two coil springs 74 are provided in the adjustable damping structure 7.

Specifically, as shown in fig. 7, two spring grooves 721 are formed in the female member 72, and one coil spring 74 is installed in each spring groove 721. The male member 71 also has a corresponding spring slot therein. After the male member 71 is inserted into the female member 72, the coil spring 74 is received in the two spring grooves 721. Double coil spring compares single spring degree of reliability better, and the cost is less than the leaf spring.

Further, as shown in fig. 7, a spiral groove 75 is formed in the adjustable damping structure 7, and one end of the coil spring 74 is fixed in the spiral groove 75.

Further, as shown in fig. 12, the dual-arm tensioner further includes a first damping member 8 and a second damping member 9, the first damping member 8 being disposed between the housing 1 and the left tensioner arm 2, and the second damping member 9 being disposed between the right tensioner arm 3 and the cover plate 4.

Further, as shown in fig. 6, the outer side walls of the male member 71 and the female member 72, which are in contact with the first damper 8, are provided with first lead-out grooves (711, 721);

the outer side wall of the right tensioner arm 3 in contact with the second damping member 9 is provided with a second lead-out groove 32.

Specifically, two semicircular first guide grooves 721 are formed on the outer side wall of the female member 72, and a semicircular first guide groove 711 is formed on the outer side wall of the male member 71. The first lead-out grooves (711, 721) are in contact with the first damper 8, and debris generated after the first damper 8 is worn out is discharged through the first lead-out grooves (711, 721), preventing the left and

right tensioner arms

2, 3 from being jammed.

The right tensioning arm 3 is provided with a second guide groove 31 on the outer side wall facing the second damping part 9, the second guide groove 31 is in contact with the second damping part 9, and chips generated after the second damping part 9 is worn are discharged through the second guide groove 31, so that the right tensioning arm 3 is prevented from being blocked.

Alternatively, the first damper 8 and the second damper 9 are made of a resin material.

Further, as shown in fig. 8, a gasket 10 is disposed at a connection position of the cover plate 4 and the housing 1, and the gasket 10 is a non-closed loop structure.

The cover plate 4 is connected with the shell 1 through a plurality of screws or bolts, the screws or bolts penetrate through the gasket 10, after the screws or bolts are fastened, the gasket 10 of the non-closed loop is compressed and deformed, the sealing performance between the cover plate 4 and the shell 1 is ensured, and dust is prevented from entering.

As shown in fig. 9-11, for each state of the dual arm tensioner.

As shown in fig. 9, the dual arm tensioner is in a rest position. At this time, the opening angle between the first tension pulley 5 and the second tension pulley 6 is small.

As shown in fig. 10, when the dual-arm tensioner is in the power-assisted or activated state, the dual-arm tensioner rotates clockwise, and the opening angle between the first tension pulley 5 and the second tension pulley 6 slightly increases.

As shown in fig. 11, when the dual-arm tensioner is in an electricity generating, energy recovering, or engine starting state, the dual-arm tensioner rotates counterclockwise, and the opening angle between the first tension pulley 5 and the second tension pulley 6 is slightly increased.

When the double-arm tensioner works, the damping is continuously worn, the damping value can be adjusted through the adjusting piece 73, and the service life of the double-arm tensioner is prolonged; when the double-arm tensioner works, the double-arm tensioner rotates around the central axis of the double-arm tensioner, and no extra space is occupied; belt 100 is trapped between left tensioner arm 2 and right tensioner arm 3, preventing backout.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims

1. The double-arm tensioner is characterized by comprising a shell (1), a left tensioning arm (2), a right tensioning arm (3), a cover plate (4), a first tensioning wheel (5) and a second tensioning wheel (6), wherein the left tensioning arm (2) and the right tensioning arm (3) are circular rings and are coaxially arranged, the left tensioning arm (2) and the right tensioning arm (3) are installed between the shell (1) and the cover plate (4), the first tensioning wheel (5) is installed on the left tensioning arm (2), the second tensioning wheel (6) is installed on the right tensioning arm (3), and an adjustable damping structure (7) is arranged between the left tensioning arm (2) and the right tensioning arm (3).

2. The dual arm tensioner according to claim 1, characterized in that the adjustable damping structure (7) comprises a male part (71) and a female part (72), the male part (71) being mounted inside the right tensioning arm (3), the female part (72) being mounted inside the left tensioning arm (2), the male part (71) being inserted into the female part (72).

3. The dual arm tensioner according to claim 2, wherein the adjustable damping structure (7) further comprises an adjusting piece (73), the adjusting piece (73) being inserted into the cover plate (4) and the housing (1) for adjusting the distance between the male piece (71) and the female piece (72).

4. The dual arm tensioner as claimed in claim 2, wherein the male member (71) is trapezoidal, or U-shaped, or V-shaped in cross section.

5. The dual-arm tensioner according to claim 1, characterized in that the first tensioning wheel (5) is mounted inside the left tensioning arm (2), the second tensioning wheel (6) is mounted inside the right tensioning arm (3), and the first tensioning wheel (5) is arranged opposite to the second tensioning wheel (6).

6. Double-arm tensioner according to claim 1, characterized in that two helical springs (74) are provided in the adjustable damping structure (7).

7. The dual arm tensioner as claimed in claim 6, wherein a helical groove (75) is opened in the adjustable damping structure (7), and one end of the helical spring (74) is fixed in the helical groove (75).

8. The dual-arm tensioner of claim 2, further comprising a first damping member (8) and a second damping member (9), the first damping member (8) being disposed between the housing (1) and the left tensioning arm (2), the second damping member (9) being disposed between the right tensioning arm (3) and the cover plate (4).

9. The dual arm tensioner as in claim 8,

the outer side walls of the convex part (71) and the concave part (72) which are contacted with the first damping part (8) are provided with first guide-out grooves;

and a second guide-out groove (31) is formed in the outer side wall, contacted with the second damping piece (9), of the right tensioning arm (3).

10. The dual arm tensioner as claimed in claim 1, wherein a washer (10) is provided at the connection of the cover plate and the housing (1), the washer (10) being a non-closed loop structure.