Motorcycle driving chain tensioning system

Abstract

A tensioning system for a driving chain of a motorcycle belongs to the technical field of chain tensioning devices and comprises a driving chain wheel, a driven chain wheel, a chain in transmission connection between the driving chain wheel and the driven chain wheel and a tensioning mechanism, and the tensioning mechanism comprises a U-shaped seat detachably and fixedly connected with a motorcycle body and a moving block slidably connected with the U-shaped seat. The U-shaped base is connected with the moving block through an adjusting bolt, the bottom end of the adjusting bolt is rotationally connected with a tensioning chain wheel through the moving block, and the tensioning chain wheel is connected with the chain in an engaged mode. In order to solve the problem that an existing device is insufficient in adjusting amount, tensioning of a chain in the whole using process can be achieved by setting the length of the bolt and the diameter of the tensioning chain wheel. The position relation and the size relation among the driving chain wheel, the tensioning chain wheel, the driven chain wheel and the chain are reasonably arranged, so that the tensioning effect is further guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of chain tensioning devices, and in particular relates to a motorcycle drive chain tensioning system. Background Art

[0002] Motorcycles are usually equipped with chain tensioning screws. By adjusting the tightness of the screws, the chain can be re-tensioned to the appropriate degree. Some motorcycles are also equipped with automatic tensioning chain tensioning mechanisms, which achieve the tensioning effect through a tensioning rod with pressure: the tensioning rod is provided with pressurized oil and a one-way valve. As the chain loosens, the tensioning rod injects oil into another chamber through the one-way valve under the pressure of the pressurized oil. At this time, the tensioning rod stretches, thereby achieving the tensioning effect.

[0003] However, both the tensioning screw and the automatic tensioning chain tensioning mechanism have the problem of limited adjustment range and cannot meet the requirements of chain tension. Utility Model Content

[0004] In view of the problems of the prior art, the present invention discloses a motorcycle drive chain tensioning system, the purpose of which is to solve the problem of insufficient adjustment of the prior tensioning screw or automatic tensioner.

[0005] To achieve the above purpose, the technical solution of this novel invention is:

[0006] A motorcycle drive chain tensioning system comprises a driving sprocket, a driven sprocket, a chain drivingly connected between the driving sprocket and the driven sprocket, and a tensioning mechanism, wherein the tensioning mechanism comprises a U-shaped seat detachably fixedly connected to a motorcycle body, and a moving block slidably connected to the U-shaped seat, wherein the U-shaped seat and the moving block are connected via an adjusting bolt, wherein the bottom end of the adjusting bolt is rotatably connected to a tensioning sprocket via the moving block, and the tensioning sprocket is meshingly connected to the chain.

[0007] Preferably, two side arms of the U-shaped seat are respectively provided with penetrating linear slide grooves, and both ends of the moving block are respectively slidably connected to the linear slide grooves.

[0008] Preferably, a U-shaped frame is fixedly connected to the middle of the moving block, a side arm of the U-shaped frame is fixedly connected to the moving block, two side arms of the U-shaped frame are respectively provided with mounting holes at their bottom ends, and a tensioning sprocket is rotatably connected between the two mounting holes.

[0009] Preferably, a bearing is provided between the two mounting holes, the inner ring of the bearing is equipped with a rotating shaft bolt, both ends of the rotating shaft bolt are fixedly connected to the mounting holes, the tensioning sprocket is provided between the two arms of the U-shaped frame and the center hole of the tensioning sprocket is assembled and connected to the rotating shaft bolt.

[0010] Preferably, a connecting hole is provided at the top of the U-shaped frame, and an adjusting bolt is connected between the connecting hole and the top of the U-shaped seat.

[0011] Preferably, the top of the U-shaped seat is provided with a through hole coaxially opposite to the connecting hole, the adjusting bolt comprises two limit nuts and a bolt, the threaded section of the bolt is threadedly connected to the limit nut, the opposite ends of the two limit nuts are respectively abutted against the upper and lower ends of the through hole, and the end of the bolt away from the limit nut passes through the connecting hole and is fixedly connected to the connecting hole.

[0012] Preferably, the corresponding relationship between the center distance A1 between the driving sprocket and the driven sprocket, and the center distance A2 between the driven sprocket and the tensioning sprocket is: A2=(0.4-0.5)*A1.

[0013] Preferably, in the initial state, the connecting line B between the center of the driving sprocket and the center of the tensioning sprocket is parallel to the driving sprocket pitch circle D1 and the bottom tangent line C from the sprocket pitch circle D2.

[0014] Preferably, the chord pitch P1 on the rolling pitch circle of the tensioning sprocket and the pitch P2 of the chain satisfy the relationship: P1 = (1-3) * P2.

[0015] Preferably, the chain is a sleeve roller chain or a sleeve chain or a toothed chain. When the chain is a toothed chain, the width of the tensioning sprocket is greater than the width of the chain.

[0016] Preferably, the number of teeth Z0 of the tensioning sprocket, the driving sprocket Z1, and the driven sprocket Z2 satisfy the relationship: Z1≤Z0<Z2.

[0017] The beneficial effects of the new motorcycle drive chain tensioning system are:

[0018] 1. Aiming at the problem of insufficient adjustment of the existing device, the new device can realize the tensioning of the chain during the whole process of use by setting the length of the bolt and the diameter of the tensioning sprocket.

[0019] 2. When the center distance between the driven sprocket and the tensioning sprocket is too short, the chain tensioning effect is not significant enough; when the center distance is too long, the size of the tensioning sprocket is small due to the limitation of the spatial position. Without changing the chain pitch, the number of teeth of the tensioning sprocket will decrease, resulting in an increase in its rotation speed, thereby increasing the amount of wear. The present invention effectively solves the above problems by setting: the corresponding relationship between the center distance A1 of the driving sprocket and the driven sprocket, and the center distance A2 of the driven sprocket and the tensioning sprocket is: A2 = (0.4-0.5) * A1.

[0020] 3. The new type is set up that: in the initial state, the connecting line B of the center of the active sprocket and the center of the tensioning sprocket is parallel to the active sprocket pitch circle D1 and the bottom tangent C from the sprocket pitch circle D2. The parallel installation angle can ensure that the tensioning wheel applies uniform tension to the chain, which helps to reduce the lateral deviation and vibration of the chain; increase the contact area, reduce the local stress on the contact surface, and help reduce friction loss and wear; easy installation, reducing possible assembly errors and adjustment work.

[0021] 4. The new type is provided with: the chord pitch P1 on the rolling pitch circle of the tensioning sprocket and the pitch P2 of the chain of the chain system satisfy the relationship: P1 = (1-3) * P2. The tensioning sprocket adopts a multiple pitch design, which can reduce the sliding and energy loss of the chain during the transmission process, improve the transmission efficiency, and reduce energy waste.

[0022] 5. When the chain is a toothed chain, the width of the tensioning sprocket is greater than the width of the chain system chain; this improves the stability of the engagement between the two.

[0023] 6. The number of teeth Z0 of the tensioning sprocket, the driving sprocket Z1, and the driven sprocket Z2 satisfy the relationship: Z1≤Z0<Z2. A reasonable tooth ratio can make the chain system drive smoothly and ensure the tensioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 , a front view of the new motorcycle drive chain tensioning system;

[0025] Figure 2 , a cross-sectional view of the novel tensioning mechanism;

[0026] Figure 3 , a schematic diagram of the cooperation between the U-shaped seat and the moving block in the novel tensioning mechanism;

[0027] Figure 4 , a comparison diagram of the positions of the moving block before and after tensioning in the novel tensioning mechanism;

[0028] Figure 5 , a schematic diagram of the position of the tensioning mechanism of the drive chain tensioning system of the novel motorcycle;

[0029] 1. Driving sprocket; 2. Chain; 3. Driven sprocket; 4. Tensioning mechanism; 401. Limiting nut; 402. U-shaped seat; 4021. Linear slide; 403. Moving block; 404. Bearing; 405. Bolt; 406. Rotating shaft bolt; 407. Tensioning sprocket; 408. U-shaped frame; 409. Mounting hole of U-shaped seat. DETAILED DESCRIPTION

[0030] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0031] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0032] Example 1

[0033] A motorcycle drive chain tensioning system, such as Figure 1-5 As shown, it includes a driving sprocket 1, a driven sprocket 3, a chain 2 transmission-connected between the driving sprocket 1 and the driven sprocket 3, and a tensioning mechanism 4, wherein the tensioning mechanism 4 includes a U-shaped seat 402 detachably fixedly connected to the motorcycle body, and a moving block 403 slidably connected to the U-shaped seat 402, wherein the U-shaped seat 402 and the moving block 403 are connected via an adjusting bolt, wherein the bottom end of the adjusting bolt is rotationally connected to a tensioning sprocket 407 via the moving block 403, and the tensioning sprocket 407 is meshingly connected to the chain 2.

[0034] In this embodiment, an adjusting bolt of suitable length and a tensioning sprocket of suitable outer diameter can be selected according to the need of tensioning the chain, thereby fully meeting the tensioning requirements of the chain and solving the problem of insufficient adjustment of existing tensioning screws or automatic tensioners.

[0035] Example 2

[0036] like Figure 2-4 As shown, the two side arms of the U-shaped seat 402 are respectively provided with penetrating linear slide grooves 4021, and the two ends of the moving block 403 are respectively slidably connected to the linear slide grooves 4021, so that the U-shaped seat 402 can guide and position the moving block 403.

[0037] Example 3

[0038] like Figure 3 As shown, a U-shaped frame 408 is fixedly connected to the middle of the moving block 403, a side arm of the U-shaped frame 408 is fixedly connected to the moving block 403, and mounting holes are respectively provided at the bottom ends of the two side arms of the U-shaped frame 408, and a tensioning sprocket 407 is rotatably connected between the two mounting holes.

[0039] like Figure 2 As shown, a bearing 404 is provided between the two mounting holes, the inner ring of the bearing 404 is equipped with a shaft bolt 406, both ends of the shaft bolt 406 are fixedly connected to the mounting holes, and the tensioning sprocket 407 is provided between the two arms of the U-shaped frame 408, and the center hole of the tensioning sprocket 407 is assembled and connected to the shaft bolt 406.

[0040] Example 4

[0041] like Figure 2-4 As shown, a connecting hole is provided at the top of the U-shaped frame 408 , and an adjusting bolt is connected between the connecting hole and the top of the U-shaped seat 408 .

[0042] like Figure 2-4 As shown, the top of the U-shaped seat 402 is provided with a through hole coaxially opposite to the connecting hole, and the adjusting bolt includes two limit nuts 401 and a bolt 405. The threaded section of the bolt 405 is screwed with the limit nut 401, and the opposite ends of the two limit nuts are respectively abutted against the upper and lower ends of the through hole, and the end of the bolt away from the limit nut passes through the connecting hole and is fixedly connected to the connecting hole.

[0043] Example 5

[0044] like Figure 5 As shown, the corresponding relationship between the center distance A1 between the driving sprocket 1 and the driven sprocket 3 and the center distance A2 between the driven sprocket 3 and the tensioning sprocket 4 is: A2 = (0.4-0.5) * A1.

[0045] Example 6

[0046] like Figure 5 As shown, the connecting line B between the center of the driving sprocket 1 and the center of the tensioning sprocket 4 is parallel to the driving sprocket pitch circle D1 and the bottom tangent line C from the sprocket pitch circle D2.

[0047] Example 7

[0048] like Figure 5 As shown, the chord pitch P1 on the rolling pitch circle of the tensioning sprocket 407 and the pitch P2 of the chain 2 of the chain system satisfy the relationship: P1 = (1-3) * P2.

[0049] Example 8

[0050] like Figure 1-5 As shown, the chain 2 is a sleeve roller chain or a sleeve chain or a toothed chain. When the chain is a toothed chain, the width of the tensioning sprocket 407 is greater than the width of the chain 2.

[0051] Example 9

[0052] like Figure 1-5 As shown, the number of teeth Z0 of the tensioning sprocket, the driving sprocket Z1, and the driven sprocket Z2 satisfy the relationship: Z1≤Z0<Z2.

[0053] The working principle of this new model:

[0054] 1. When the position of the tensioning sprocket needs to be changed, loosen the limit nut and move the bolt downward, thereby driving the tensioning sprocket to move downward. After reaching the appropriate position, tighten the chain, and then re-tighten the limit nut so that the opposite end of the limit nut is pressed against the upper and lower ends of the through hole.

[0055] 2. Aiming at the problem of insufficient adjustment of the existing device, the new device can achieve tensioning of the chain throughout the whole process of use by setting the length of the bolt and the diameter of the tensioning sprocket.

[0056] 3. When the center distance between the driven sprocket 3 and the tensioning sprocket 4 is too short, the chain tensioning effect is not significant enough; when the center distance is too long, the size of the tensioning sprocket is small due to the limitation of the spatial position. Without changing the chain pitch, the number of teeth of the tensioning sprocket will decrease, resulting in an increase in its rotation speed, thereby increasing the amount of wear. The present invention effectively solves the above problems by setting: the corresponding relationship between the center distance A1 of the driving sprocket 1 and the driven sprocket 3, and the center distance A2 of the driven sprocket 3 and the tensioning sprocket 4 is: A2 = (0.4-0.5) * A1.

[0057] 4. The new type is set up that: in the initial state, the connecting line B of the center of the driving sprocket 1 and the center of the tensioning sprocket 4 is parallel to the driving sprocket pitch circle D1 and the bottom tangent C from the sprocket pitch circle D2. The parallel installation angle can ensure that the tensioning wheel applies uniform tension to the chain, which helps to reduce the lateral deviation and vibration of the chain; increase the contact area, reduce the local stress on the contact surface, and help reduce friction loss and wear; easy installation, reducing possible assembly errors and adjustment work.

[0058] 5. The present invention is provided with: the chord pitch P1 on the rolling pitch circle of the tensioning sprocket 407 and the pitch P2 of the chain 2 of the chain system satisfy the relationship: P1 = (1-3) * P2. The tensioning sprocket adopts a chord pitch design on the rolling pitch circle with multiple times, which can reduce the sliding and energy loss of the chain during the transmission process, improve the transmission efficiency, and reduce energy waste.

[0059] 6. When the chain is a toothed chain, the width of the tensioning sprocket 407 is greater than the width of the chain 2 of the chain system, thereby improving the stability of the engagement between the two.

[0060] 7. The number of teeth Z0 of the tensioning sprocket, the driving sprocket Z1, and the driven sprocket Z2 satisfy the relationship: Z1≤Z0<Z2. A reasonable tooth ratio can make the chain system drive smoothly and ensure the tensioning effect.

Claims

1. A motorcycle drive chain tensioning system, characterized in that it comprises a driving sprocket, a driven sprocket, a chain drivingly connected between the driving sprocket and the driven sprocket, and a tensioning mechanism, wherein the tensioning mechanism comprises a U-shaped seat detachably fixedly connected to a motorcycle body, and a moving block slidably connected to the U-shaped seat, wherein the U-shaped seat and the moving block are connected by an adjusting bolt, wherein the bottom end of the adjusting bolt is rotatably connected to a tensioning sprocket through the moving block, and the tensioning sprocket is meshingly connected to the chain.

2. A motorcycle drive chain tensioning system as claimed in claim 1, characterized in that: The two side arms of the U-shaped seat are respectively provided with penetrating linear slide grooves, and the two ends of the moving block are respectively slidably connected with the linear slide grooves.

3. A motorcycle drive chain tensioning system as claimed in claim 2, characterized in that: The middle of the moving block is fixedly connected with a U-shaped frame, a side arm of the U-shaped frame is fixedly connected with the moving block, the bottom ends of the two side arms of the U-shaped frame are respectively provided with mounting holes, and a tensioning sprocket is rotatably connected between the two mounting holes.

4. A motorcycle drive chain tensioning system as described in claim 3, characterized in that: a bearing is provided between the two mounting holes, the inner ring of the bearing is equipped with a rotating shaft bolt, both ends of the rotating shaft bolt are fixedly connected to the mounting holes, the tensioning sprocket is provided between the two arms of the U-shaped frame and the center hole of the tensioning sprocket is assembled and connected with the rotating shaft bolt.

5. A motorcycle drive chain tensioning system as claimed in claim 4, characterized in that: a connecting hole is provided at the top of the U-shaped frame, and an adjusting bolt is connected between the connecting hole and the top of the U-shaped seat; The top of the U-shaped seat is provided with a through hole coaxially opposite to the connecting hole. The adjusting bolt includes two limit nuts and a bolt. The threaded section of the bolt is threadedly connected to the limit nut. The opposite ends of the two limit nuts are respectively abutted against the upper and lower ends of the through hole. The end of the bolt away from the limit nut passes through the connecting hole and is fixedly connected to the connecting hole.

6. A motorcycle drive chain tensioning system as claimed in claim 5, characterized in that: The corresponding relationship between the center distance A1 between the driving sprocket and the driven sprocket, and the center distance A2 between the driven sprocket and the tensioning sprocket is: A2 = (0.4-0.5) * A1.

7. A motorcycle drive chain tensioning system as claimed in claim 6, characterized in that: In the initial state, the connecting line B between the center of the driving sprocket and the center of the tensioning sprocket is parallel to the driving sprocket pitch circle D1 and the bottom tangent line C from the sprocket pitch circle D2.

8. A motorcycle drive chain tensioning system as claimed in claim 7, characterized in that: The chord pitch P1 on the rolling pitch circle of the tensioning sprocket and the pitch P2 of the chain satisfy the relationship: P1 = (1-3) * P2.

9. A motorcycle drive chain tensioning system as claimed in claim 8, characterized in that: The chain is a sleeve roller chain or a sleeve chain or a toothed chain. When the chain is a toothed chain, the width of the tensioning sprocket is greater than the width of the chain.

10. A motorcycle drive chain tensioning system as claimed in claim 9, characterized in that: The number of teeth Z0 of the tensioning sprocket, the driving sprocket Z1, and the driven sprocket Z2 satisfy the relationship: Z1≤Z0<Z2.

Images