Chain tensioning structure of gearbox

Abstract

The utility model belongs to the technical field of chain tensioning, and provides a chain tensioning structure of a gearbox, which comprises a gearbox main body and a tensioning mechanism assembly arranged on the gearbox main body, the tensioning mechanism assembly comprises a pressing block and an adjusting mechanism, the adjusting mechanism is arranged on the gearbox main body, and the pressing block is arranged on the tensioning mechanism assembly. The pressing block is arranged on one side of a chain of the gearbox body, the pressing block is rotatably installed on the adjusting mechanism and moves along with the adjusting mechanism in the direction of pressing or loosening the chain, and the pressing block is in an arc shape with the middle protruding towards the direction of the chain. According to the chain tensioning device, the problem that the pressing block is excessively abraded due to the fact that the contact area is reduced is solved, the service life of the pressing block can be prolonged, and the tensioning effect of the chain can be guaranteed.

Description

Technical Field

[0001] The invention discloses a chain tensioning structure of a gearbox, belonging to the technical field of chain tensioning. Background Art

[0002] The transmission of a snowmobile is usually a CVT transmission, which is usually connected to the drive wheel of the snowmobile through a chain. The chain must be equipped with a tensioning mechanism to adjust the tension of the chain to avoid the problem of chain loosening due to wear after a period of use.

[0003] The tensioning mechanism on the existing CVT transmission usually uses a clamping block to clamp the chain, thereby adjusting the tensioning degree of the chain. However, the inventor found that after the tensioning block clamps the chain, the wrap angle between the chain and the sprocket will change. In addition, the diameters of the driving sprocket and the driven sprocket of the CVT transmission are different, which causes the contact surface between the tensioning block and the chain to change, making the contact surface between the clamping block and the chain smaller. In order to protect the chain, the hardness of the clamping block is usually smaller than the hardness of the chain. The smaller contact surface between the clamping block and the chain will cause the clamping block to wear faster, which will not only affect the service life of the clamping block, but also affect the tensioning effect of the chain. Utility Model Content

[0004] The purpose of the technical problem to be solved by the utility model is to overcome the shortcomings of the existing technology and provide a chain tensioning structure for a gearbox that can avoid the contact area between the clamping block and the chain being too small during the adjustment process, thereby achieving a good chain tensioning effect and avoiding excessive wear of the clamping block.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the chain tensioning structure of the gearbox includes a gearbox main body and a tensioning mechanism assembly installed on the gearbox main body, the tensioning mechanism assembly includes a clamping block and an adjusting mechanism, the adjusting mechanism is installed on the gearbox main body, the clamping block is arranged on one side of the chain of the gearbox main body, the clamping block is rotatably installed on the adjusting mechanism, and moves with the adjusting mechanism in the direction of tightening or loosening the chain, and the clamping block is an arc with the middle part convex toward the direction of the chain.

[0006] Furthermore, a mounting sleeve is fixedly mounted on a side of the pressing block away from the chain, a mounting shaft is provided on the adjusting mechanism, and the mounting sleeve is rotatably mounted outside the mounting shaft.

[0007] Furthermore, an elastic retaining ring is provided on the installation shaft, and the installation sleeve is located between the elastic retaining ring and the adjustment mechanism.

[0008] Furthermore, a reinforcing plate is provided between the mounting sleeve and the pressing block. The reinforcing plate is an arc-shaped plate that is spaced apart and arranged on the outside of the mounting sleeve. Both ends of the reinforcing plate are fixedly connected to the pressing block, and the middle part of the reinforcing plate is fixedly connected to the mounting sleeve through a rib plate.

[0009] Furthermore, the adjustment mechanism includes a threaded rod and an adjustment block. A mounting groove is provided on the inner wall of the gearbox body. The threaded rod can be rotatably installed in the mounting groove. One side of the adjustment block can be slidably provided in the mounting groove. The threaded rod is threadedly connected to the adjustment block, and the clamping block can be rotatably installed on the adjustment block.

[0010] Furthermore, one end of the threaded rod extends out of the gearbox body, and a seal is provided between the threaded rod and the gearbox body.

[0011] Furthermore, it also includes a limiting piece, which is detachably connected to the threaded rod.

[0012] Furthermore, the limiting member includes a clamping ring, a locking hole is provided on the threaded rod, a locking portion movably inserted into the locking hole is provided on one side of the clamping ring, and an elastic pressing portion for pressing the side of the threaded rod is provided on the other side.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The adjusting mechanism of the present invention can drive the pressing block to move, so as to adjust the pressing force of the pressing block on the chain, and thus adjust the tensioning degree of the chain. The adjustment is convenient, and the pressing block is rotatably mounted on the adjusting mechanism. When the pressing block presses the chain, it can realize adaptive adjustment according to the angle of the chain to ensure that the pressing block and the chain fit reliably and the contact area between the pressing block and the chain is ensured, thereby avoiding the problem of excessive wear of the pressing block due to the reduction of the contact area, which can not only improve the service life of the pressing block, but also ensure the tensioning effect of the chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a three-dimensional structural diagram of the threaded rod and the tensioning mechanism;

[0017] Figure 3 It is a structural diagram of the locking assembly.

[0018] In the figure: 1. Transmission body; 2. Threaded rod; 3. Driving sprocket; 4. Tensioning mechanism assembly; 41. Mounting shaft; 42. Pressing block; 43. Mounting sleeve; 44. Elastic retaining ring; 45. Reinforcement plate; 5. Chain; 6. Driven sprocket; 7. Snap ring; 71. Locking part; 72. Elastic pressing part; 73. Locking hole; 8. Adjusting block. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention must go beyond these limited embodiments. For some equivalent replacement solutions or common means, they will not be described in detail herein, but they still fall within the scope of protection of this application.

[0020] Figure 1-Figure 3 This is the best embodiment of the present invention, Figure 1-Figure 3 The utility model is further described.

[0021] Refer to the attached Figure 1-Figure 3 A chain tensioning structure of a gearbox includes a gearbox body 1 and a tensioning mechanism assembly 4 installed on the gearbox body 1. The tensioning mechanism assembly 4 includes a clamping block 42 and an adjusting mechanism. The adjusting mechanism is installed on the gearbox body 1. The clamping block 42 is arranged on one side of the chain 5 of the gearbox body 1. The clamping block 42 is rotatably installed on the adjusting mechanism and moves along the direction of tightening or loosening the chain 5 with the adjusting mechanism. The clamping block 42 is an arc with the middle part convex toward the direction of the chain 5. The adjusting mechanism of the present invention can drive the pressing block 42 to move, so as to adjust the pressing force of the pressing block 42 on the chain 5, and thus adjust the tensioning degree of the chain 5. The adjustment is convenient, and the pressing block 42 is rotatably mounted on the adjusting mechanism. When the pressing block 42 presses the chain 5, it can realize adaptive adjustment according to the angle of the chain 5 to ensure that the pressing block 42 fits reliably with the chain 5 and the contact area between the pressing block 42 and the chain 5, thereby avoiding the problem of excessive wear of the pressing block 42 due to the reduction of the contact area, which can not only improve the service life of the pressing block 42, but also ensure the tensioning effect of the chain 5.

[0022] The driving sprocket 3 and the driven sprocket 6 of the gearbox body 1 are rotatably mounted on both ends of the gearbox body 1, and the chain 5 is arranged between the driving sprocket 3 and the driven sprocket 6. In this embodiment, the driven sprocket 6 is used for power output.

[0023] The adjusting mechanism is located on one side of the chain 5 to avoid obstruction to the operation of the chain 5 , and the pressing block 42 is located on the right side of the chain 5 to adjust the progress of the chain 5 by pressing the chain 5 .

[0024] The adjustment mechanism includes a threaded rod 2 and an adjustment block 8. A mounting slot is provided on one side of the transmission body 1. The bottom of the mounting slot is a semicircular shape with a convex center. The threaded rod 2 is rotatably mounted within the mounting slot. The lower portion of the adjustment block 8 extends into the mounting slot and slides relative to the mounting slot. The adjustment block 8 is threadedly connected to the threaded rod 2, and a clamping block 42 is rotatably mounted above the adjustment block 8. Rotating the threaded rod 2 moves the adjustment block 8 along the mounting slot. The mounting slot limits the adjustment block 8, preventing it from rotating with the threaded rod 2. The clamping block 42 moves synchronously with the adjustment block 8, thereby compressing the chain 5.

[0025] In order to facilitate the adjustment of the tension of the chain 5, one end of the threaded rod 2 can be rotatably extended out of the gearbox body 1, and a seal is provided between the threaded rod 2 and the gearbox body 1 to facilitate the adjustment of the tension of the chain 5.

[0026] The adjustment block 8 is integrally provided with a mounting shaft 41. A mounting sleeve 43 is integrally provided on the side of the pressure block 42 away from the chain 5. The mounting sleeve 43 is rotatably mounted on the mounting shaft 41. Furthermore, an elastic circlip 44 is mounted on the end of the mounting shaft 41 away from the adjustment block 8. The elastic circlip 44 limits the mounting sleeve 43 to prevent it from separating from the mounting shaft 41.

[0027] Furthermore, a reinforcing plate 45 is provided between the clamping block 42 and the mounting sleeve 43. The reinforcing plate 45 is an arc-shaped plate that is spaced apart and sleeved outside the mounting sleeve 43. The two ends of the reinforcing plate 45 are detachably connected to the corresponding end of the clamping block 42, and the middle part of the reinforcing plate 45 is integrally connected to the middle part of the mounting sleeve 43 through a rib plate to increase the connection strength between the mounting sleeve 43 and the clamping block 42.

[0028] In this embodiment, the adjusting block 8 and the pressing block 42 are both made of polytetrafluoroethylene material.

[0029] The tensioning mechanism assembly 4 also includes a limiter. In this embodiment, the limiter is a snap ring 7, which is detachably mounted on one end of the threaded rod 2 outside the gearbox body 1. When the tensioning degree of the chain 5 is adjusted, the snap ring 7 is mounted on the threaded rod 2. Since the snap ring 7 interferes with the gearbox body 1, the threaded rod 2 can be limited in the circumferential direction to ensure that the tensioning degree of the chain 5 is stable.

[0030] A locking hole 73 is provided at one end of the threaded rod 2 located outside the gearbox body 1, and a locking portion 71 for inserting into the locking hole 73 is provided on one side of the snap ring 7, and an elastic pressing portion 72 is provided on the other side. When the locking portion 71 is inserted into the locking hole 73, the elastic pressing portion 72 can press the threaded rod 2, thereby preventing the snap ring 7 from separating from the threaded rod 2.

[0031] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A chain tensioning structure for a gearbox, comprising a gearbox body (1) and a tensioning mechanism assembly (4) mounted on the gearbox body (1), characterized in that: The tensioning mechanism assembly (4) includes a clamping block (42) and an adjusting mechanism. The adjusting mechanism is mounted on the gearbox body (1). The clamping block (42) is arranged on one side of the chain (5) of the gearbox body (1). The clamping block (42) is rotatably mounted on the adjusting mechanism and moves along the direction of tightening or loosening the chain (5) with the adjusting mechanism. The clamping block (42) is in the shape of an arc with the middle portion convex toward the chain (5).

2. The chain tensioning structure of a gearbox according to claim 1, characterized in that: A mounting sleeve (43) is fixedly mounted on the side of the pressing block (42) away from the chain (5), a mounting shaft (41) is provided on the adjustment mechanism, and the mounting sleeve (43) is rotatably sleeved outside the mounting shaft (41).

3. The chain tensioning structure of a gearbox according to claim 2, characterized in that: An elastic circlip (44) is provided on the installation shaft (41), and the installation sleeve (43) is located between the elastic circlip (44) and the adjustment mechanism.

4. The chain tensioning structure of a gearbox according to claim 2, characterized in that: A reinforcing plate (45) is provided between the mounting sleeve (43) and the pressing block (42). The reinforcing plate (45) is an arc-shaped plate that is spaced apart and arranged outside the mounting sleeve (43). Both ends of the reinforcing plate (45) are fixedly connected to the pressing block (42), and the middle part of the reinforcing plate (45) is fixedly connected to the mounting sleeve (43) through a rib plate.

5. The chain tensioning structure of a gearbox according to claim 4, characterized in that: The adjustment mechanism includes a threaded rod (2) and an adjustment block (8). A mounting groove is provided on the inner wall of the gearbox body (1). The threaded rod (2) is rotatably mounted in the mounting groove. One side of the adjustment block (8) is slidably disposed in the mounting groove. The threaded rod (2) is threadedly connected to the adjustment block (8). The pressing block (42) is rotatably mounted on the adjustment block (8).

6. The chain tensioning structure of a gearbox according to claim 5, characterized in that: One end of the threaded rod (2) extends out of the gearbox body (1), and a seal is provided between the threaded rod (2) and the gearbox body (1).

7. A chain tensioning structure for a gearbox according to claim 5 or 6, characterized in that: It also includes a limiting piece, which is detachably connected to the threaded rod (2).

8. The chain tensioning structure of a gearbox according to claim 7, characterized in that: The limiting member includes a snap ring (7), a locking hole (73) is provided on the threaded rod (2), a locking portion (71) movably inserted into the locking hole (73) is provided on one side of the snap ring (7), and an elastic pressing portion (72) for pressing the side of the threaded rod (2) is provided on the other side.

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