Tensioner

Abstract

The utility model provides a tensioner, and belongs to the technical field of automobile accessories. The technical problem that an existing tensioner mandrel slips is solved. The tensioner comprises a supporting arm, a mandrel, a tensioning arm, a core sleeve and a spring, one end of the spring is connected with the supporting arm, the other end of the spring is connected with the tensioning arm, the spring biases the tensioning arm relative to the supporting arm, the end, away from the supporting arm, of the mandrel is fixedly connected with an adjusting piece, a gasket is arranged between the adjusting piece and the tensioning arm, the gasket is fixedly connected with the tensioning arm, and an indicating groove is formed in the adjusting piece. A marking groove is formed in the gasket, a mounting round hole is formed in the supporting arm and provided with one or more first inclined blocks, one or more first bevel edges are arranged on the mandrel, and the mandrel penetrates through the mounting round hole to enable the first bevel edges and the first inclined blocks to abut against each other and then be riveted and fixed. The utility model has the advantage of preventing the support arm and the mandrel from slipping.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile accessories, in particular to a tensioner. Background Art

[0002] The tensioner acts on the timing belt or timing chain of the engine. The tensioner is used to tighten the timing belt or timing chain, thereby applying a certain force to the timing belt or timing chain to compensate for the change in tension caused by the increase in the length of the belt or chain due to other factors, so that the timing belt or chain maintains a basically constant tension.

[0003] The existing tensioner is as shown in the instruction manual. Figure 1 As shown, it includes a core shaft 2, a support arm 1, a spring 2, a tensioning arm 3 and a damping member, and an adjusting member 6 fixed to the core shaft, which are sequentially sleeved on the core shaft 2 and fixed to the core shaft 2, wherein a wheel body is rotatably sleeved outside the tensioning arm. In the above tensioner, the support arm is provided with a mounting circular hole, one end of the core shaft passes through the mounting circular hole for riveting and fixing, the core shaft has a mounting through hole, and the fastening bolt passes through the mounting through hole to fix the core shaft and the support arm to the engine. The tensioner adjusts a certain spring torque to pre-tighten the engine belt, and the spring torque is adjusted so that the indicator groove on the adjusting member corresponds to the marking groove. At this time, the spring torque of the tensioner best matches the belt tensioning state. Usually, the angle between the indicator groove on the adjusting member and the marking groove in the original state of the spring is called the working angle A. However, one end of the core shaft is cylindrical and riveted with the mounting circular hole of the support arm. When adjusting the spring torque, the core shaft and the stamping support arm may slip. Moreover, the adjusting part is fixed at the end of the core shaft away from the stamping support arm. The indicator groove on the adjusting part may slip along with the core shaft and the stamping support arm, which will cause the working angle to not match, resulting in excessive or insufficient spring torque, thus affecting the normal operation of the tensioner. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a tensioner. The technical problem to be solved by the utility model is: how to prevent the core shaft from slipping so that the working angle after assembly is consistent.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a tensioner, comprising a support arm, a mandrel fixedly connected to the support arm, a tensioning arm rotatably arranged on the mandrel, a core sleeve arranged between the mandrel and the tensioning arm, a spring arranged between the support arm and the tensioning arm, one end of the spring connected to the support arm, and the other end connected to the tensioning arm, the spring biases the tensioning arm relative to the support arm, an adjusting member is fixedly connected to one end of the mandrel away from the support arm, a gasket is arranged between the adjusting member and the tensioning arm, the gasket is fixedly connected to the tensioning arm, an indicating groove is arranged on the adjusting member, a marking groove is arranged on the gasket, the support arm is provided with a mounting circular hole, the mounting circular hole has one or more inclined blocks 1, one or more inclined edges 1 are arranged on the mandrel, the mandrel passes through the mounting circular hole so that the inclined edges 1 and the inclined blocks 1 are abutted and then riveted and fixed. The mandrel and the support arm cooperate through the inclined edges 1 and the inclined blocks 1, effectively limiting the circumferential rotation of the mandrel relative to the support arm, increasing the riveting force of the mandrel and the support arm, preventing the support arm and the mandrel from slipping, and facilitating the consistent working angle after assembly.

[0006] Furthermore, the mounting circular hole has an inclined block 1 protruding toward the axis direction, and the end of the mandrel is indented toward the axis to have an inclined edge 1, so that the inclined edge 1 and the inclined block 2 can be machined conveniently.

[0007] Furthermore, the inner wall of the mounting circular hole is indented with a plurality of grooves in the direction away from the axis, and the end face of the mandrel is protruded with a plurality of bumps along the axis, and the bumps are located on the inner circumference of the mounting circular hole between two adjacent grooves. When the mandrel and the support arm are riveted together, the mandrel is squeezed into the mounting circular hole by the extrusion force to achieve the tightening effect; after riveting, the bumps are located on the inner circumference of the mounting circular hole between two adjacent grooves to limit the radial movement of the mandrel.

[0008] Furthermore, there are four grooves, which are evenly distributed on the inner circumference of the mounting circular hole, and the inclined block 1 is located between two of the grooves. This allows the mandrel and the support arm to be more evenly squeezed into the groove when riveted together, thereby increasing the riveting force between the mandrel and the support arm, preventing the support arm and the mandrel from slipping, and facilitating consistent working angles after assembly.

[0009] Furthermore, the mounting circular hole has two inclined blocks 1 protruding toward the axial direction, and the end of the mandrel is indented toward the axial direction with an inclined edge 1 corresponding to the inclined block 1. The mandrel and the support arm cooperate through the inclined edge 1 and the inclined block 1, which effectively limits the circumferential rotation of the mandrel relative to the support arm, increases the riveting force of the mandrel and the support arm, prevents the support arm and the mandrel from slipping, and facilitates consistent working angles after assembly.

[0010] Furthermore, there are two inclined blocks 1, and the inner side wall of the mounting circular hole is indented with a plurality of grooves in the direction away from the axis, and the end face of the mandrel is protruding with a plurality of bumps along the axis, and the bumps are located on the inner circumference of the mounting circular hole between two adjacent grooves, and the inclined block 1 and the grooves are evenly distributed on the mounting circular hole. When the mandrel and the support arm are riveted together, the mandrel is squeezed into the mounting circular hole by the extrusion force to achieve the tightening effect; after riveting, the bumps are located on the inner circumference of the mounting circular hole between two adjacent grooves to limit the radial movement of the mandrel; the inclined block 1 and the grooves are evenly distributed on the mounting circular hole so that the mandrel and the support arm are more evenly squeezed into the groove when they are riveted together.

[0011] Furthermore, the adjusting member is provided with a second inclined block, and the core shaft has a second inclined edge at one end away from the support arm. The adjusting member is sleeved on the core shaft and riveted, and the second inclined edge abuts against the second inclined block.

[0012] Furthermore, the gasket has a buckle, the tension arm has a slot, and the buckle and the slot are fixedly matched. The gasket has a marking slot, and the marking slot needs to be relatively fixed with the tension arm. Due to structural limitations, it is not easy to set a marking slot on the tension arm, so the marking slot is set on the gasket. Since the gasket is made of plastic, it can be integrally formed, and the gasket and the tension arm are fixed to ensure that the marking slot is relatively fixed.

[0013] Furthermore, the width of the indicating groove is greater than the width of the marking groove.

[0014] Compared with the prior art, the technical effects of the utility model are as follows: 1. The mandrel and the support arm cooperate with the bevel edge 1 and the bevel block 1, which effectively limits the circumferential rotation of the mandrel relative to the support arm, increases the riveting force of the mandrel and the support arm, prevents the support arm and the mandrel from slipping, and facilitates the consistent working angle after assembly; 2. The setting of evenly distributed grooves makes the mandrel and the support arm more evenly squeezed into the grooves when riveting, increases the riveting force of the mandrel and the support arm, prevents the support arm and the mandrel from slipping, and facilitates the consistent working angle after assembly. 3. The protrusion is located on the inner circumference of the mounting circular hole between two adjacent grooves to limit the radial movement of the mandrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the left side view of the existing tensioner.

[0016] Figure 2 It is the right view of the utility model.

[0017] Figure 3 It is a front sectional view of the utility model.

[0018] Figure 4 It is a left view of the utility model.

[0019] Figure 5 It is a stereoscopic diagram of the mandrel and the supporting arm of the utility model.

[0020] Figure 6 It is a stereoscopic diagram of another embodiment of the core shaft and the support arm of the utility model.

[0021] Figure number marking: 1. Support arm; 101. Mounting circular hole; 102. Bevel block 1; 103. Groove; 2. Mandrel; 201. Bevel edge 1; 202. Protrusion; 203. Bevel edge 2; 3. Tensioning arm; 301. Slot; 4. Core sleeve; 5. Spring; 6. Adjustment piece; 601. Indicator slot; 602. Bevel block 2; 7. Gasket; 701. Marking slot; 702. Buckle; A. Working angle. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] according to Figures 2 to 5 As shown, a tensioner comprises a support arm 1, a spindle 2 fixedly connected to the support arm 1, and a tensioning arm 3 rotatably arranged on the spindle 2. The spindle 2 has a mounting through hole for accommodating a fixing bolt, so that the tensioner is mounted on the engine, the tensioning arm 3 is pivotally mounted on the spindle 2, the wheel body is rotatably mounted on the tensioning arm 3 through a bearing, a core sleeve 4 is arranged between the spindle 2 and the tensioning arm 3, a spring 5 is arranged between the support arm 1 and the tensioning arm 3, one end of the spring 5 is connected to the support arm 1, and the other end is connected to the tensioning arm 3, and the spring 5 biases the tensioning arm 3 relative to the support arm 1. The end of the mandrel 2 away from the support arm 1 is fixedly connected with an adjusting member 6, a gasket 7 is arranged between the adjusting member 6 and the tensioning arm 3, the gasket 7 is fixedly connected with the tensioning arm 3, the adjusting member 6 has an indicating groove 601, the gasket 7 has a marking groove 701, the support arm 1 is provided with a mounting circular hole 101, the mounting circular hole 101 has one or more inclined blocks 102, the mandrel 2 is provided with one or more bevels 201, the mandrel 2 passes through the mounting circular hole 101 so that the bevels 201 and the inclined blocks 102 are abutted and then riveted and fixed. The mandrel 2 and the support arm 1 cooperate with the bevels 201 and the inclined blocks 102, which effectively limits the circumferential rotation of the mandrel 2 relative to the support arm 1, increases the riveting force of the mandrel 2 and the support arm 1, prevents the support arm 1 and the mandrel 2 from slipping, and facilitates the consistency of the working angle A after assembly.

[0024] Preferably, the inclined block 102 and the bevel are both one, and an inclined block 102 protrudes from the mounting circular hole 101 toward the axial direction, and the end of the core shaft 2 is indented toward the axis to have a bevel 201, so that it is convenient to machine the bevel 201 and the inclined block 602.

[0025] The core shaft 2 and the support arm 1 are riveted together by the force of extrusion. In order to better rivet the two, a plurality of grooves 103 are indented on the inner wall of the mounting circular hole 101 in the direction away from the axis. A plurality of protrusions 202 are protruded along the axis on the end face of the core shaft 2. The protrusion 202 is located on the inner circumference of the mounting circular hole 101 between two adjacent grooves 103. The core shaft 2 is squeezed into the mounting circular hole 101 by the force of extrusion. Since the core shaft 2 is made of steel and the support arm 1 is made of aluminum, the provision of the groove 103 prevents the wall of the mounting circular hole 101 from rupture. When the two are extruded and riveted together, the wall of the mounting circular hole 101 between the two grooves 103 will bulge with the extrusion of the core shaft 2 to achieve a tightening effect. After riveting, the protrusion 202 is located on the inner circumference of the mounting circular hole 101 between two adjacent grooves 103 to limit the radial movement of the core shaft 2.

[0026] The number of grooves 103 can be more than 2, and preferably there are four grooves 103, which are evenly distributed on the inner circumference of the mounting circular hole 101, and the inclined block 102 is located between two of the grooves 103. This arrangement can make the force on the mandrel 2 and the support arm 1 more uniform when riveting, increase the riveting force of the mandrel 2 and the support arm 1, prevent the support arm 1 and the mandrel 2 from slipping, and facilitate the consistency of the working angle A after assembly.

[0027] The adjusting member 6 is provided with a second inclined block 602, and a second inclined edge 203 at one end of the core shaft 2 away from the support arm 1. The adjusting member 6 is sleeved on the core shaft 2 and riveted, and the second inclined edge 203 abuts against the second inclined block 602. The gasket 7 and the tensioning arm 3 are fixedly matched by setting a buckle 702 and a slot 301. The gasket 7 has a buckle 702, and the tensioning arm 3 has a slot 301. The buckle 702 and the slot 301 are fixedly matched. The gasket 7 can rotate relative to the core shaft 2 along with the tensioning arm 3. The gasket 7 has a marking groove 701, and the marking groove 701 needs to be relatively fixed with the tensioning arm 3. Due to structural limitations, it is not easy to set the marking groove 701 on the tensioning arm 3. Therefore, the marking groove 701 is set on the gasket 7. Since the gasket 7 is made of plastic material, it can be integrally formed. The gasket 7 is fixed with the tensioning arm 3 to ensure that the marking groove 701 is relatively fixed. The indicator groove 601 is fixed on the adjusting member 6, and the adjusting member 6 and the core shaft 2 are fixed relative to the engine and do not rotate, that is, the marking groove 701 will rotate relative to the indicator groove 601 as the tensioning arm 3 works. Since the width of the indicator groove 601 is greater than the width of the marking groove 701, the torque of the spring 5 within the width range of the indicator groove 601 is the normal working value.

[0028] like Figure 6As shown, in other embodiments of the inclined block 102 and the inclined surface 1, there may be several inclined blocks 102 and inclined surface 1, including two or more. Several inclined blocks 102 are blocks protruding from the mounting circular hole 101 toward the axial direction, and the bevel 1 201 corresponding to the inclined block 102 is a plane indented toward the axial direction by the end of the mandrel 2. The mounting circular hole 101 has two or more inclined blocks 102 protruding toward the axial direction, and the end of the mandrel 2 has two symmetrical bevels 201 indented toward the axis. It is preferred here that there are two inclined blocks 102, and there are two bevels 201 corresponding to the inclined block 102. There are several grooves 103 indented on the inner wall of the mounting circular hole 101 away from the axis direction, and several protrusions 202 protrude from the end face of the core shaft 2 along the axis direction. The protrusions 202 are located on the inner circumference of the mounting circular hole 101 between two adjacent grooves 103, and the inclined blocks 102 and the grooves 103 are evenly distributed on the mounting circular hole 101. The core shaft 2 and the support arm 1 cooperate with the bevel 1 201 and the inclined block 102, which effectively limits the circumferential rotation of the core shaft 2 relative to the support arm 1, increases the riveting force of the core shaft 2 and the support arm 1, prevents the support arm 1 and the core shaft 2 from slipping, and facilitates the consistency of the working angle A after assembly. When the core shaft 2 and the support arm 1 are riveted together, the extrusion force is used to squeeze the core shaft 2 into the mounting circular hole 101 to achieve the effect of tightening; after riveting, the protrusion 202 is located on the inner circumference of the mounting circular hole 101 between two adjacent grooves 103 to limit the radial movement of the core shaft 2; the inclined block 102 and the groove 103 are evenly distributed on the mounting circular hole 101, so that the core shaft 2 and the support arm 1 are more evenly squeezed into the groove 103 when they are riveted together.

[0029] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A tensioner, comprising a support arm (1), a core shaft (2) fixedly connected to the support arm (1), a tensioning arm (3) rotatably arranged on the core shaft (2), a core sleeve (4) arranged between the core shaft (2) and the tensioning arm (3), a spring (5) arranged between the support arm (1) and the tensioning arm (3), one end of the spring (5) being connected to the support arm (1) and the other end being connected to the tensioning arm (3), the spring (5) biasing the tensioning arm (3) relative to the support arm (1), characterized in that: An adjusting member (6) is fixedly connected to one end of the core shaft (2) away from the support arm (1); a gasket (7) is arranged between the adjusting member (6) and the tensioning arm (3); the gasket (7) is fixedly connected to the tensioning arm (3); an indicating groove (601) is arranged on the adjusting member (6); a marking groove (701) is arranged on the gasket (7); the support arm (1) is provided with a mounting circular hole (101); the mounting circular hole (101) has one or more inclined blocks (102); one or more bevels (201) are arranged on the core shaft (2); the core shaft (2) passes through the mounting circular hole (101) so that the bevels (201) and the inclined blocks (102) are abutted against each other and then riveted and fixed.

2. A tensioner according to claim 1, characterized in that: The mounting circular hole (101) has an inclined block (102) protruding toward the axis direction, and the end of the core shaft (2) is indented toward the axis to have an inclined edge (201).

3. A tensioner according to claim 2, characterized in that: A plurality of grooves (103) are indented on the inner side wall of the mounting circular hole (101) in a direction away from the axis, and a plurality of protrusions (202) are protruded on the end surface of the core shaft (2) along the axis direction. The protrusions (202) are located on the inner circumference of the mounting circular hole (101) between two adjacent grooves (103).

4. A tensioner according to claim 3, characterized in that: There are four grooves (103), which are evenly distributed on the inner circumference of the mounting circular hole (101), and the inclined block 1 (102) is located between two of the grooves (103).

5. A tensioner according to claim 1, characterized in that: The mounting circular hole (101) has two or more inclined blocks (102) protruding toward the axial direction, and the end of the core shaft (2) is indented toward the axial direction to have an inclined edge (201) corresponding to the inclined block (102).

6. A tensioner according to claim 5, characterized in that: There are two inclined blocks (102); a plurality of grooves (103) are indented on the inner side wall of the mounting circular hole (101) in a direction away from the axis; a plurality of protrusions (202) are protruded on the end face of the core shaft (2) along the axis; the protrusions (202) are located on the inner circumference of the mounting circular hole (101) between two adjacent grooves (103); and the inclined blocks (102) and the grooves (103) are evenly distributed on the mounting circular hole (101).

7. A tensioner according to any one of claims 1 to 6, characterized in that: The adjusting member (6) is provided with a second inclined block (602), and a second inclined edge (203) is provided on an end of the core shaft (2) away from the support arm (1). The adjusting member (6) is sleeved on the core shaft (2) and riveted, and the second inclined edge (203) abuts against the second inclined block (602).

8. A tensioner according to claim 7, characterized in that: The gasket (7) has a buckle (702), the tensioning arm (3) has a slot (301), and the buckle (702) and the slot (301) are fixedly matched.

9. A tensioner according to claim 8, characterized in that: The width of the indicating groove (601) is greater than the width of the marking groove (701).

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