Motorcycle engine chain tensioner

Abstract

The utility model discloses a motorcycle engine chain tensioner belongs to motorcycle engine technical field, including frame, the frame lower surface fixedly connected with the connecting frame, and the connecting frame outside lower extreme fixedly connected with the protection washer, and the frame inside rotation is provided with the pivot, the pivot upper surface fixedly connected with the antiskid frame simultaneously, the antiskid frame rotation is arranged in the frame outside, and the frame is rotationally provided with the transmission shaft through the push assembly inside, and transmission shaft surface fixedly connected with the connecting gear. The motorcycle engine chain tensioner, through the ratchet wheel and the pawl that set, can make the push rod continuously provide stable tension for the chain, ensure that the chain is always in the proper tension state, maintain the good meshing between the chain and the sprocket at the same time, guarantee the stability and reliability of power transmission, avoid the problems such as skip tooth, chain off caused by chain slack, guarantee the normal operation of motorcycle engine.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle engine technology, specifically to a motorcycle engine chain tensioner. Background Technology

[0002] A motorcycle engine is a machine that ignites the fuel-air mixture entering the cylinder, converting the heat energy generated by combustion into mechanical energy. This mechanical energy is then transmitted through the crankshaft and transmission mechanism to the rear wheel of the motorcycle, thus providing the power for the vehicle to move. The motorcycle engine chain is used to transfer kinetic energy to the wheels, and the tensioner is the device that keeps the chain taut. Currently, tensioners are usually bolted to a suitable position on the motorcycle. However, due to the various degrees of vibration that occur during motorcycle operation, these bolts are prone to loosening, leading to the tensioner loosening or even falling off, resulting in poor applicability. Furthermore, the tensioner's sealing ring also needs to be sealed, making its manufacturing process relatively complicated, with numerous parts and a complex structure.

[0003] To overcome the above-mentioned defects, the prior art (Chinese patent application number 201310677084.8, application date 2013-12-12) provides a motorcycle engine chain tensioner, which solves the problem of complex structure of existing motorcycle engine chain tensioners. It includes a housing with a cylindrical inner cavity, a rod-shaped push rod inside the housing, one end of the push rod extending out of the housing, and a strip-shaped through hole parallel to the axis of the inner cavity and communicating with the inner cavity on the side of the housing opposite to the extended end of the push rod. An annular shoulder is located in the middle of the strip-shaped through hole. The tensioner also includes a plug made of rubber material, comprising a sheet-shaped head and a columnar insertion part. One end of the insertion part is fixed to the middle of the head, and the insertion part is located within the annular shoulder in a tight fit. The head is located on the outside of the housing. This tensioner has a simple structure, low processing cost, and is easy to install.

[0004] Motorcycles operate under complex and varied conditions during operation, such as acceleration, deceleration, and climbing. Without a self-locking component, the tensioner cannot automatically maintain the appropriate chain tension according to different conditions. For example, during acceleration, the chain experiences increased force; without a self-locking component, the push rod easily retracts, causing the chain to slack instantly and interrupting power transmission. During deceleration, the chain slacks, and the push rod cannot automatically adjust to maintain tension, affecting the smooth transmission of power during the next acceleration. Furthermore, the aforementioned device cannot ensure that the chain is always at the appropriate tension during use, causing the chain deflection to exceed the safe range, leading to tooth skipping and chain derailment. This renders the tensioner ineffective, and the unstable meshing between the chain and sprocket accelerates sprocket tooth wear, shortening the device's lifespan. Utility Model Content

[0005] The purpose of this utility model is to provide a motorcycle engine chain tensioner to solve the problems mentioned in the background art, which are that the chain cannot always be kept in a proper tension state, causing the chain deflection to exceed the safe range, resulting in tooth skipping and chain derailment, thus causing the tensioner to fail. At the same time, the unstable meshing between the chain and the sprocket will accelerate the wear of the sprocket teeth and shorten the service life of the device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a motorcycle engine chain tensioner, comprising a frame, a connecting frame fixedly connected to the lower surface of the frame, and a protective washer fixedly connected to the lower outer end of the connecting frame; a rotating shaft rotatably mounted inside the frame, and an anti-slip frame fixedly connected to the upper surface of the rotating shaft; the anti-slip frame rotatably mounted outside the frame, and a drive shaft rotatably mounted inside the frame via a pushing assembly, with a connecting gear fixedly connected to the surface of the drive shaft, and the connecting gear rotatably mounted inside the connecting frame; a connecting shaft rotatably mounted inside the frame via a self-locking assembly, with a pawl fixedly connected to the surface of the connecting shaft, and the pawl rotatably mounted inside the connecting frame; and a connecting rod fixedly connected to the lower surface of the frame.

[0007] Preferably, the pushing component includes a limiting rod fixedly connected to the inner wall of the connecting frame, and the limiting rod is slidably connected to a fixing plate. The end of the drive shaft away from the connecting gear has an external thread groove, and the fixing plate is threadedly connected to the surface of the drive shaft.

[0008] Preferably, a fixed gear is fixedly connected to the surface of the rotating shaft, and the fixed gear is meshed with the connecting gear; a push plate is fixedly connected to the outer side of the fixed plate.

[0009] Preferably, a protective cover is fixedly connected to the inner wall of the connecting frame, and one end of a fixing spring is fixedly connected to the inner wall of the protective cover, and a push rod is fixedly connected to the other end of the fixing spring, and the push rod is slidably disposed inside the connecting frame.

[0010] Preferably, a force-bearing plate is fixedly connected to the lower surface of the push rod, and a fixing frame is fixedly connected to the outer side of the push rod, with the upper surface of the fixing frame fitting against the lower surface of the push plate.

[0011] Preferably, the self-locking assembly includes a ratchet fixedly connected to the surface of the rotating shaft, and the ratchet is engaged with the pawl. A buffer spring is fixedly connected to one end of the pawl surface, and the connecting rod is fixedly connected to the other end of the buffer spring.

[0012] Preferably, a baffle is fixedly connected to the surface of the connecting shaft, and one end of a torsion spring is fixedly connected to the surface of the baffle, while the other end of the torsion spring is fixedly connected to the frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the motorcycle engine chain tensioner adopts a novel structural design, the specific details of which are as follows: (1) The motorcycle engine chain tensioner, through the ratchet and pawl, enables the push rod to continuously provide stable tension to the chain, ensuring that the chain is always in a suitable tension state, while maintaining good meshing between the chain and the sprocket, ensuring the stability and reliability of power transmission, avoiding problems such as tooth skipping and chain derailment caused by chain slack, and ensuring the normal operation of the motorcycle engine.

[0014] Furthermore, the self-locking structure of the ratchet and pawl prevents the push rod from accidentally retracting due to engine vibration, chain impact, or other factors, thus avoiding the risk of chain slack caused by push rod retraction and enhancing the overall reliability of the tensioner structure.

[0015] (2) The motorcycle engine chain tensioner, through the push rod and push plate, can make the tension force evenly applied to the chain, avoid excessive local force causing chain link damage, and the contact area between the tension plate and the chain is larger, which can disperse pressure, reduce single-point wear, and at the same time avoid chain deformation caused by the push rod directly hitting the chain, thus extending the chain service life.

[0016] Furthermore, the stainless steel push rod and the rigid plate load-bearing plate have high mechanical strength, are resistant to high temperatures and vibration, and are not easily deformed. They can not only adapt to the complex working conditions of motorcycle engines, but also effectively save production and usage costs.

[0017] (3) The motorcycle engine chain tensioner, through the protective gasket and protective cover, can not only block dust, mud, oil and other impurities from entering the tensioner, but also the protective gasket can buffer the impact of high-frequency vibration of the engine on the connection parts, reduce the risk of loosening of parts, and avoid damage to the internal structure from external impacts, thus improving the stability of operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure between the frame and the connecting frame of this utility model.

[0019] Figure 2 This is a schematic diagram of the connection structure between the rotating shaft and the anti-slip bracket of this utility model.

[0020] Figure 3 This is a schematic diagram of the connection structure between the fixed gear and the rotating shaft of this utility model.

[0021] Figure 4 This is a schematic diagram of the connection structure between the push plate and the fixing plate of this utility model.

[0022] Figure 5 This is a schematic diagram of the connection structure between the fixed spring and the protective cover of this utility model.

[0023] Figure 6 This is a schematic diagram of the connection structure between the rotating shaft and the ratchet of this utility model.

[0024] Figure 7 This utility model Figure 6 Enlarged structural diagram at point A in the middle.

[0025] In the diagram: 1. Frame; 2. Connecting frame; 3. Protective washer; 4. Rotating shaft; 5. Anti-slip frame; 6. Fixed gear; 7. Drive shaft; 8. Connecting gear; 9. Fixed plate; 10. Limiting rod; 11. Push plate; 12. Protective cover; 13. Push rod; 14. Force plate; 15. Fixed frame; 16. Fixed spring; 17. Buffer spring; 18. Ratchet; 19. Connecting shaft; 20. Pawl; 21. Baffle; 22. Torsion spring; 23. Connecting rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: The connecting bracket 2, anti-slip bracket 5, and protective washer 3 can prevent dust, mud, engine oil, and other impurities from entering the tensioner, and at the same time, can buffer the impact of high-frequency engine vibration on the connection parts. Figures 1-2 As shown: It includes a frame 1, a connecting frame 2 fixedly connected to the lower surface of the frame 1, and a protective washer 3 fixedly connected to the lower outer end of the connecting frame 2. A rotating shaft 4 is rotatably installed inside the frame 1, and an anti-slip frame 5 is fixedly connected to the upper surface of the rotating shaft 4. The anti-slip frame 5 is rotatably installed outside the frame 1. A drive shaft 7 is rotatably installed inside the frame 1 through a pushing component, and a connecting gear 8 is fixedly connected to the surface of the drive shaft 7. The connecting gear 8 is rotatably installed inside the connecting frame 2. A connecting shaft 19 is rotatably installed inside the frame 1 through a self-locking component, and a pawl 20 is fixedly connected to the surface of the connecting shaft 19. The pawl 20 is rotatably installed inside the connecting frame 2. A connecting rod 23 is fixedly connected to the lower surface of the frame 1.

[0028] The operator will fix the connecting bracket 2 on the lower surface of the frame 1 to the corresponding position on the motorcycle engine, and ensure the connection is stable by tightening the lock nut and loosening the washer. At the same time, the protective washer 3 on the lower outer side of the connecting bracket 2 will fit tightly against the mounting surface to form a sealed protective layer (such as...). Figure 1As shown), when the chain needs to be tightened, the worker rotates the anti-slip bracket 5, and the one-way tooth groove inclined surface of the ratchet 18 presses against the head of the pawl 20, causing the pawl 20 to swing slightly around the connecting shaft 19. After the pawl 20 passes the current tooth peak, it quickly returns to its original position under the action of the spring rebound force, and locks into the vertical surface of the next tooth groove until it is fully in contact with the chain surface (as shown). Figure 2 As shown), the push plate 11 on the outside of the fixed plate 9 pushes the force plate 14 at the lower end of the push rod 13 closer to the chain surface. Through the large-area contact of the force plate 14, the pushing force is evenly distributed to the chain surface, avoiding local force concentration. The pawl 20 and ratchet 18 prevent the shaft 4 from rotating in the opposite direction, ensuring that the chain always maintains stable tension.

[0029] In Example 2, unlike Example 1, the transmission shaft 7, fixed gear 6, and force-bearing plate 14 ensure that the tension force is evenly distributed on the chain, preventing excessive localized stress that could damage the chain links. Figures 3-5 As shown: The pushing component includes a limiting rod 10 fixedly connected to the inner wall of the connecting frame 2, and a fixing plate 9 is slidably connected through the limiting rod 10. An external threaded groove is opened on the surface of the drive shaft 7 away from the connecting gear 8. At the same time, the fixing plate 9 is threadedly connected to the surface of the drive shaft 7. A fixing gear 6 is fixedly connected to the surface of the rotating shaft 4, and the fixing gear 6 and the connecting gear 8 are meshed. A push plate 11 is fixedly connected to the outer side of the fixing plate 9. A protective cover 12 is fixedly connected to the inner wall of the connecting frame 2, and one end of a fixing spring 16 is fixedly connected to the inner wall of the protective cover 12. A push rod 13 is fixedly connected to the other end of the fixing spring 16, and the push rod 13 is slidably disposed inside the connecting frame 2. A force-bearing plate 14 is fixedly connected to the lower surface of the push rod 13, and a fixing frame 15 is fixedly connected to the outer side of the push rod 13. The upper surface of the fixing frame 15 is in contact with the lower surface of the push plate 11.

[0030] When the operator needs to adjust the tension of the motorcycle engine chain, they rotate the anti-slip bracket 5 on the surface of the frame 1, causing the anti-slip bracket 5 to drive the rotating shaft 4 on its surface to rotate inside the frame 1. This causes the fixed gear 6 on the surface of the rotating shaft 4 to mesh with the connecting gear 8 on the surface of the drive shaft 7 (e.g., Figure 3 and Figure 4 As shown), the drive shaft 7 rotates inside the connecting frame 2, and through the threaded groove on the surface of the drive shaft 7 and the threaded engagement of the fixed plate 9, the fixed plate 9 slides linearly along the surface of the limiting rod 10. The limiting rod 10 restricts the rotation of the fixed plate 9, ensuring that it moves only axially. As the fixed plate 9 moves synchronously, it causes the outer push plate 11 to gradually come into contact with the fixed frame 15 and apply a pushing force, causing the push rod 13 connected to the fixed frame 15 to slide smoothly inside the connecting frame 2. At the same time, the fixing spring 16 on the inner wall of the protective cover 12 extends towards the surface of the push rod 13, so that the force plate 14 on the lower surface of the push rod 13 moves closer to the chain until it is fully in contact with the surface of the chain (as shown). Figure 5 As shown, the thrust is evenly distributed to the chain surface through the large-area contact of the force plate 14, avoiding local force concentration. At the same time, the buffer spring 17 on the surface of the pawl 20 and the connecting rod 23 can ensure that the pawl 20 and the ratchet 18 are tightly engaged.

[0031] In Example 3, unlike Example 2, the ratchet 18, pawl 20, and buffer spring 17 enable the push rod 13 to continuously provide stable tension to the chain, ensuring that the chain is always in a suitable tension state. Figures 6-7 As shown: The self-locking assembly includes a ratchet 18 fixedly connected to the surface of the rotating shaft 4, and the ratchet 18 is engaged with the pawl 20. One end of the buffer spring 17 is fixedly connected to the surface of the pawl 20, and the other end of the buffer spring 17 is fixedly connected to the connecting rod 23. A baffle 21 is fixedly connected to the surface of the connecting shaft 19, and one end of the torsion spring 22 is fixedly connected to the surface of the baffle 21. The other end of the torsion spring 22 is fixedly connected to the frame 1.

[0032] When the operator releases the self-locking component of the device, they can rotate the connecting shaft 19 (e.g., with the aid of a tool) Figure 6 As shown), the pawl 20 on the surface of the connecting shaft 19 separates from the ratchet 18 on the surface of the rotating shaft 4. The head of the pawl 20 overcomes the preload of the buffer spring 17 and the torsion spring 22. At this time, the ratchet 18 loses the constraint of the pawl 20 and can rotate in the opposite direction with the rotating shaft 4. At the same time, the torsion spring 22 at the lower end of the frame 1 retracts towards the surface of the baffle 21 on the surface of the connecting shaft 19 (as shown). Figure 7 As shown), when the operator rotates the shaft 4 in the opposite direction, under the action of the fixed spring 16, the push rod 13 can drive the lower force plate 14 to separate from the chain. This not only makes it convenient for the operator to maintain the tensioner, but also allows the connecting shaft 19 to be released during subsequent locking. The torsion spring 22 drives the pawl 20 on the surface of the connecting shaft 19 to reset, so that the pawl 20 and the ratchet 18 can be engaged, ensuring the overall reliability and durability of the device.

[0033] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motorcycle engine chain tensioner, comprising a frame (1), wherein a connecting frame (2) is fixedly connected to the lower surface of the frame (1), and a protective washer (3) is fixedly connected to the lower outer side of the connecting frame (2), and a rotating shaft (4) is rotatably provided inside the frame (1), and an anti-slip frame (5) is fixedly connected to the upper surface of the rotating shaft (4). Its features are: The anti-slip frame (5) is rotatably disposed on the outside of the frame (1), and a drive shaft (7) is rotatably disposed inside the frame (1) via a push assembly, and a connecting gear (8) is fixedly connected to the surface of the drive shaft (7), while the connecting gear (8) is rotatably disposed inside the connecting frame (2). The frame (1) has a connecting shaft (19) rotatably mounted inside by a self-locking assembly, and a pawl (20) is fixedly connected to the surface of the connecting shaft (19). The pawl (20) is rotatably mounted inside the connecting frame (2), and a connecting rod (23) is fixedly connected to the lower surface of the frame (1).

2. A motorcycle engine chain tensioner as defined in claim 1 wherein: The pushing component includes a limiting rod (10) fixedly connected to the inner wall of the connecting frame (2), and the limiting rod (10) is slidably connected to a fixing plate (9). The surface of the transmission shaft (7) is provided with an external thread groove at one end away from the connecting gear (8), and the surface of the transmission shaft (7) is threadedly connected to the fixing plate (9).

3. A motorcycle engine chain tensioner as claimed in claim 2, characterised in that: A fixed gear (6) is fixedly connected to the surface of the rotating shaft (4), and the fixed gear (6) is meshed with the connecting gear (8). A push plate (11) is fixedly connected to the outside of the fixed plate (9).

4. A motorcycle engine chain tensioner as claimed in claim 3, characterised in that: The inner wall of the connecting frame (2) is fixedly connected to a protective cover (12), and one end of a fixing spring (16) is fixedly connected to the inner wall of the protective cover (12), and the other end of the fixing spring (16) is fixedly connected to a push rod (13), and the push rod (13) is slidably disposed inside the connecting frame (2).

5. A motorcycle engine chain tensioner as claimed in claim 4, characterised in that: A force-bearing plate (14) is fixedly connected to the lower surface of the push rod (13), and a fixing frame (15) is fixedly connected to the outer side of the push rod (13), and the upper surface of the fixing frame (15) is in contact with the lower surface of the push plate (11).

6. A motorcycle engine chain tensioner as defined in claim 1 wherein: The self-locking assembly includes a ratchet (18) fixedly connected to the surface of the rotating shaft (4), and the ratchet (18) is engaged with the pawl (20). One end of a buffer spring (17) is fixedly connected to the surface of the pawl (20), and the other end of the buffer spring (17) is fixedly connected to the connecting rod (23).

7. A motorcycle engine chain tensioner as claimed in claim 6, characterised in that: A baffle (21) is fixedly connected to the surface of the connecting shaft (19), and one end of a torsion spring (22) is fixedly connected to the surface of the baffle (21), and the other end of the torsion spring (22) is fixedly connected to the frame (1).

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