Linear transmission belt tensioner

Abstract

The utility model discloses a linear transmission belt tensioner which comprises a fixed base and a swing arm capable of swinging around a fixed axis, a tensioning wheel abutting against a transmission belt is arranged on the swing arm, a rotating shaft of the tensioning wheel deviates from the swinging axis of the swing arm, and a pressed spiral spring is arranged between the swing arm and the base. The two ends of the spiral spring are supported on the base and the swing arm respectively, the swing arm and the base are connected through a connecting piece, the connecting piece penetrates through the spiral spring, one end of the connecting piece is fixed to one of the swing arm and the base, the other one of the swing arm and the base is provided with a flat hole for the connecting piece to penetrate through, and the other end of the connecting piece penetrates through the flat hole and is twisted. The portion, abutting against the inner wall of the flat hole, of the connecting piece is a contact portion, and the section, in the direction perpendicular to the extending direction of the connecting piece, of the contact portion is in a wave shape. The connecting piece is in contact with the two inner walls of the flat hole respectively, so that noise, vibration and abrasion caused by flapping the flat hole by the connecting piece are avoided.

Description

Technical Field

[0001] The utility model relates to a linear transmission belt tensioner, in particular to a linear transmission belt tensioner used in an internal combustion engine transmission system. Background Art

[0002] Referring to DE19501685C1, the traditional linear tensioner includes a fixed base and a swing arm that can swing around a fixed axis, and a metal belt is flexibly connected between the two. One end of the metal belt is fixed to the base, and the other end passes through the through hole of the swing arm, and the swing arm and the base are relatively limited by deformation. During the use of the tensioner, the metal belt will produce high-frequency slapping with the inner wall of the through hole due to vibration, thereby generating noise, vibration and wear.

[0003] Therefore need to design a kind of new linear transmission belt tensioner to adapt to the needs of production and use. Utility Model Content

[0004] The technical problem to be solved by the invention is to provide a linear transmission belt tensioner which can reduce noise.

[0005] In order to solve the above technical problems, the present invention provides a linear transmission belt tensioner, comprising a fixed base, a swing arm that can swing around a fixed axis, a tensioning wheel that abuts the transmission belt is arranged on the swing arm, the rotating axis of the tensioning wheel is deviated from the axis of the swing arm swing, a compressed coil spring is arranged between the swing arm and the base, and its two ends are respectively supported on the base and the swing arm, the swing arm and the base are connected by a connecting piece, and the connecting piece passes through the coil spring, one end of the connecting piece is fixed on one of the swing arm or the base, and the other of the swing arm or the base is provided with a flat hole for the connecting piece to pass through, the other end of the connecting piece passes through the flat hole and is twisted to form a limiting portion that limits the interval length between the base and the swing arm, the portion of the connecting piece abutting in the flat hole is a contact portion, and the contact portion is wavy along a cross-section perpendicular to the extension direction of the connecting piece.

[0006] The connecting piece in the new linear transmission belt tensioner contacts the two inner walls of the flat hole respectively, thereby avoiding the noise, vibration and wear caused by the connecting piece hitting the flat hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a three-dimensional schematic diagram of the linear belt tensioner created for this project.

[0008] Figure 2 This is a three-dimensional schematic diagram of the connecting parts of the linear transmission belt tensioner created for this purpose.

[0009] Figure 3 For along Figure 1 Schematic diagram of the cross-section along the AA section line.

[0010] Figure 4 It is a cross-sectional schematic diagram of a linear transmission belt tensioner having a connecting member according to another embodiment. DETAILED DESCRIPTION

[0011] The following is combined with Figure 1-4 Provide a clear and complete description of the linear belt tensioner of this invention.

[0012] A linear transmission belt tensioner includes a fixed base 1, which is fixed to a mounting surface by various common methods, such as bolts; and a swing arm 2 that can swing around a fixed axis 21. The swing arm 2 is provided with a tensioning wheel 3 that abuts against a transmission belt (not shown), and the rotating shaft 31 of the tensioning wheel 3 deviates from the axis 21 of the swing arm 2. A compressed coil spring 5 is provided between the swing arm 2 and the base 1, and its two ends are supported on the base 1 and the swing arm 2 respectively. In order to make the coil spring 5 cooperate with the swing arm 2 and the base 1 in a radial position, the base 1 and the swing arm 2 are respectively provided with protrusions 11 and 22 that protrude into the coil spring 5, or the base 1 and the swing arm 2 are respectively provided with recesses that accommodate the ends of the coil spring 5, or one of the base 1 and the swing arm 2 is provided with a protrusion and the other is provided with a recess. When the coil spring 5 is under pressure, it can stably cooperate with the swing arm 2 and the base 1 without radially moving out of the swing arm 2 and the base 1.

[0013] The swing arm 2 is connected to the base 1 via a connector 4. Preferably, the connector 4 is a metal belt. One end of the connector 4 is fixed to one of the swing arm 2 or the base 1. In the present invention, one end 41 of the connector 4 is fixed to the swing arm 2. The connector 4 passes through the coil spring 5. The other end of the swing arm 2 or the base 1 is provided with a flat hole 12 for the connector 4 to pass through. During assembly, the other end of the connector 4 passes through the flat hole 12 and twists to form a limiting portion 42 that limits the length of the interval between the base 1 and the swing arm 2. The connector 4 is also provided with a loading pin hole 43 on the limiting portion. Before the tensioner is assembled to the engine, a loading pin 6 is inserted into the loading pin hole 43. After the tensioner is assembled to the engine, the loading pin 6 is removed, and the swing arm 2 is stretched away from the base 1 under the action of the coil spring 5.

[0014] refer to Figure 3-4, the part of the connector 4 that abuts against the flat hole 12 is the contact portion 44, and the cross-section of the contact portion 44 along the direction perpendicular to the extension direction of the connector 4 is wavy. The tensioner is also provided with a storage member 7. Preferably, the storage member 7 is made of plastic. Compared with the connector 4 made of metal, the friction noise that may be generated between the storage member 7 made of plastic and the connector 4 is relatively small, and the hardness of plastic is lower than that of metal material, which reduces the deformation or wear of the connector 4. The flat hole 12 is arranged in the storage member 7, and the contact portion 44 of the connector 4 abuts against the inner wall of the flat hole 12 of the storage member 7. When the linear transmission belt tensioner vibrates, the wavy contact portion 44 of the connector 4 will abut against the long edge of the flat hole 12, avoiding or reducing the contact portion 44 of the connector 4 from hitting the inner wall of the long edge of the flat hole 12, thereby reducing the noise generated by vibration.

[0015] Preferably, the cross section of the contact portion 44 along the direction perpendicular to the extension direction of the connector 4 is W-shaped. The contact portion 44 includes an arc portion 45 abutting against the two inner walls of the flat hole 12 and an edge portion 46 separated from the inner wall of the flat hole 12. Of course, the contact portion can also be a combination of multiple W or U shapes, which also belongs to the wave shape described in the present invention.

[0016] Optionally, the cross section of the contact portion 44 along a direction perpendicular to the extension direction of the connecting member 4 is U-shaped, and the edge and the arc portion of the contact portion 44 respectively abut against two inner walls of the flat hole 12 .

[0017] The above technical solution is only an explanation of the embodiment of the present invention, not a limitation of the present invention. Any equivalent changes made by those skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. A linear transmission belt tensioner, comprising a fixed base, a swing arm that can swing around a fixed axis, a tensioning wheel that abuts against the transmission belt is arranged on the swing arm, the rotating shaft of the tensioning wheel deviates from the axis of the swing arm swing, a compressed coil spring is arranged between the swing arm and the base, and its two ends are respectively supported on the base and the swing arm, the swing arm and the base are connected by a connecting piece, the connecting piece passes through the coil spring, one end of the connecting piece is fixed to one of the swing arm or the base, the other of the swing arm or the base is provided with a flat hole for the connecting piece to pass through, the other end of the connecting piece passes through the flat hole and twists to form a limiting portion that limits the interval length between the base and the swing arm, characterized in that The portion of the connecting member abutting against the inner wall of the flat hole is a contact portion, and the cross section of the contact portion along a direction perpendicular to the extending direction of the connecting member is wavy.

2. The linear transmission belt tensioner according to claim 1, characterized in that: A storage piece is also provided, the flat hole is provided in the storage piece, and the contact portion of the connecting piece abuts against the flat hole of the storage piece.

3. The linear transmission belt tensioner according to claim 2, characterized in that: The storage piece is made of plastic.

4. The linear transmission belt tensioner according to claim 1, characterized in that: The cross section of the contact portion along a direction perpendicular to the extending direction of the connecting member is W-shaped.

5. The linear transmission belt tensioner according to claim 4, characterized in that: The contact portion includes an arc portion abutting against the inner wall of the flat hole and an edge portion separated from the inner wall of the flat hole.

6. The linear transmission belt tensioner according to claim 1, characterized in that: The cross section of the contact portion along a direction perpendicular to the extending direction of the connecting member is U-shaped.

7. The linear transmission belt tensioner according to claim 1, characterized in that: The connecting piece is also provided with a loading pin hole on the limiting portion.

8. The linear transmission belt tensioner according to claim 1, characterized in that: The base and the swing arm are respectively provided with a protrusion that protrudes into the coil spring.

9. The linear transmission belt tensioner according to claim 1, characterized in that: The base and the swing arm are respectively provided with a recessed portion for accommodating the end of the coil spring.

10. The linear transmission belt tensioner according to claim 1, characterized in that: One of the base and the swing arm is provided with a recessed portion for accommodating the end of the coil spring, and the other is provided with a raised portion.

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