Off-road vehicle sprocket

Abstract

The utility model relates to off -road motorcycle parts technical field, concretely relates to an off -road vehicle chain wheel, the inner side of chain wheel spoke is fixed with inside fender chain plate, inside fender chain plate is located in the first gap and there is a gap between inside fender chain plate and rear wheel, inside fender chain plate is curved surface ring plate, the inner ring of curved surface ring plate extends and is attached to chain wheel spoke, the outer ring of curved surface ring plate is away from chain wheel gear ring, the upper edge of inside fender chain plate is higher than chain wheel gear ring, there is the second gap between inside fender chain plate and chain, adopt above technical scheme, because inside fender chain plate is fixed on the inner side of chain wheel spoke, utilize the side of chain wheel spoke and chain wheel gear ring and there is the first gap between rear wheel, inside fender chain plate only surrounds chain wheel gear ring and part chain wheel spoke, equivalent to only chain wheel gear ring is kept in the periphery, the original chain wheel hub and the installation mode installation structure do not have any change, and simple installation structure can effectively prevent chain falling technical problem.

Description

Technical Field

[0001] This utility model relates to the technical field of off-road motorcycle parts, and in particular to an off-road vehicle sprocket. Background Technology

[0002] Off-road motorcycles are motorcycles specifically designed for off-road environments, primarily used for traversing complex terrains such as mountains, deserts, and mud, and are suitable for off-road racing and outdoor adventure activities. Based on their power source, off-road motorcycles mainly include gasoline-powered off-road motorcycles and electric off-road motorcycles, such as... Figure 1 and Figure 2 As shown, most off-road motorcycles use a mid-mounted power unit (a fuel generator or electric motor is placed in the middle of the frame), which transmits power to a sprocket 3 fixed on the protruding rear wheel hub 2 via a chain 1. The sprocket includes a sprocket hub, sprocket spokes, and a sprocket gear ring. The sprocket gear ring is the toothed part on the outer edge of the gear, which directly participates in the meshing transmission. The sprocket spokes are the structure connecting the gear ring to the hub. The sprocket hub is the part where the center of the gear mates with the shaft, used for fixing and transmitting power. Due to the harsh environment in which they are used, especially when riding in mountainous terrain, the chain is often hit by rocks and other foreign objects, causing the chain to deviate from the gears on the sprocket gear ring and eventually fall off during riding.

[0003] To effectively prevent chain slippage, prior art, such as Chinese Patent No. CN220816482U, discloses a novel motorcycle sprocket, including chain teeth, a chain disc connected to the surface of the chain teeth, a baffle connected to the surface of the chain disc, the baffle being ring-shaped, mating holes, ventilation holes, positioning holes, fixing holes, and mounting holes on the surface of the chain disc, with fixing ends on the surface of the mounting holes. In use, the chain is passed through the chain teeth between the chain disc and the baffle, and the bottom bracket is fixedly connected via the mounting holes using the fixing ends and fixing holes. The positioning holes are used to position the chain disc and chain teeth. This sprocket essentially surrounds the two sides of the original sprocket with the chain disc, and then further surrounds part of the chain disc with a baffle. While this structure prevents the chain from slipping, installing the chain requires passing it through the gap between the connecting baffle and the chain disc, making chain installation cumbersome and the structure for fixing the chain disc and chain teeth relatively complex. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sprocket for off-road vehicles that can effectively prevent the chain from falling off by adopting a simple installation structure.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A sprocket for an off-road vehicle, wherein the off-road motorcycle uses a mid-mounted power unit, and power is transmitted to the sprocket fixed to the convex rear wheel hub via a chain. The sprocket includes a sprocket hub, sprocket spokes, and a sprocket tooth ring. A first gap exists between the sides of the sprocket spokes and the sprocket tooth ring and the rear wheel. The sprocket hub has sprocket hub mounting holes, and the sprocket is fixed to the rear wheel hub by bolts passing through the sprocket hub mounting holes. An inner chain guard plate is fixed on the inner side of the sprocket spokes. The inner chain guard plate is located within the first gap and has a gap with the rear wheel. The inner chain guard plate is a curved circular ring plate. The inner ring of the curved circular ring plate extends towards and fits the sprocket spokes, and the outer ring of the curved circular ring plate is away from the sprocket tooth ring. The upper edge of the inner chain guard plate is higher than the sprocket tooth ring. A second gap exists between the inner chain guard plate and the chain.

[0006] By adopting the above technical solution, since the inner chain guard plate is fixed on the inner side of the sprocket spokes, and there is a first gap between the side of the sprocket spokes and the sprocket tooth ring and the rear wheel, the inner chain guard plate only surrounds the sprocket tooth ring and part of the sprocket spokes, which is equivalent to only surrounding half of the hub. There is no change in the original sprocket hub and installation method. Compared with the existing technology, the simple installation structure can effectively prevent the chain from falling off.

[0007] The reason why only the inner chain guard was used is that when riding in mountainous terrain, the chain is often hit by rocks from the outside in, so it is only necessary to prevent the chain from deviating inward from the gears on the sprocket ring.

[0008] Further specifying, an outer chain guard plate is fixed to the outer surface of the sprocket spokes. The outer chain guard plate is a curved circular ring plate, with its inner ring extending towards and fitting against the sprocket spokes, and its outer ring away from the sprocket tooth ring. The upper edge of the outer chain guard plate is higher than the sprocket tooth ring, and a third gap exists between the outer chain guard plate and the chain. This structure uses both inner and outer chain guard plates to prevent the chain from slipping off, and compared to existing technologies, chain installation is also less complicated.

[0009] Furthermore, the outer stop chain plate and the inner stop chain plate are symmetrical to each other.

[0010] Furthermore, the specific design defines how the inner stop chain plate is installed on the sprocket spokes. Specifically, the sprocket spokes are provided with sprocket inner fixing holes, and the inner stop chain plate is provided with inner stop chain plate mounting holes that match the sprocket inner fixing holes. The inner stop chain plate is fixed to the sprocket spokes by passing bolts through the inner stop chain plate mounting holes and the sprocket inner fixing holes.

[0011] Similarly, the outer stop chain plate is specifically designed to be installed on the sprocket spokes. That is, the sprocket spokes are provided with sprocket external fixing holes, and the outer stop chain plate is provided with an outer stop chain plate mounting hole that matches the sprocket external fixing hole. The outer stop chain plate is fixed on the sprocket spokes by passing a bolt through the outer stop chain plate mounting hole and the sprocket external fixing hole.

[0012] Then, the specific size of the gap is defined, that is, the outer edge of the inner chain guard plate is 2-8mm higher than the sprocket tooth ring, the outer edge of the outer chain guard plate is 2-8mm higher than the sprocket tooth ring, the size of the second gap is 2-8mm, and the size of the third gap is 2-8mm.

[0013] In this technical solution, the purpose of setting the gap is to ensure that there is no interference during rotation. The inner and outer baffle plates are made of aluminum alloy, which has high strength, good casting performance and plastic processing performance, good corrosion resistance and machinability.

[0014] This technical solution has a simple structure and does not change the original sprocket installation structure. It simply uses bolts to attach the inner and outer chain guards or directly welds them to the side of the sprocket spokes. This simple installation structure can effectively prevent the chain from falling off. Attached Figure Description

[0015] Figure 1 This is a three-dimensional diagram illustrating the installation of sprockets on off-road motorcycles using existing technology. Figure 2 This is a front view diagram of the installation of a sprocket on an off-road motorcycle using existing technology; Figure 3 This is a front view schematic diagram of the installation of the off-road motorcycle sprocket according to Embodiment 1 of this utility model; Figure 4 yes Figure 3 A side-view exploded assembly diagram of the structure; Figure 5 This is a front view schematic diagram of the installation of the off-road motorcycle sprocket according to Embodiment 2 of this utility model; Figure 6 yes Figure 5 A side-view exploded assembly diagram of the structure; Figure 7 This is a three-dimensional schematic diagram of the inner baffle plate of Embodiment 1; Figure 8 yes Figure 7 Front view diagram; Figure 9 This is a three-dimensional schematic diagram of the outer baffle plate or inner baffle plate in Embodiment 2; Figure 10 yes Figure 9 Front view diagram. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown in Embodiment 1, an off-road vehicle sprocket is provided. The off-road motorcycle employs a mid-mounted power unit, transmitting power to a sprocket 3 fixed to the outwardly protruding rear wheel hub 2 via a chain 1. The sprocket 3 includes a sprocket hub, sprocket spokes, and a sprocket gear ring. A first gap 41 exists between the sides of the sprocket spokes and the sprocket gear ring and the rear wheel. The sprocket hub has sprocket hub mounting holes, and the sprocket is fixed to the rear wheel hub 2 by bolts passing through the sprocket hub mounting holes. An inner chain guard plate 321 is fixed on the inner side of the sprocket spokes. The inner chain guard plate 321 is located within the first gap 41 and has a gap with the rear wheel 4. The inner chain guard plate 321 is a curved circular ring plate, and the inner ring of the curved circular ring plate extends towards and fits the sprocket spokes. The outer ring of the curved circular plate is far from the sprocket tooth ring. This structure allows the inner ring of the inner stop plate 321 to fit against the sprocket spokes, while the outer ring of the stop plate 321 is far from the sprocket tooth ring. The upper edge of the inner stop plate 321 is higher than the sprocket tooth ring. A second gap 320 exists between the inner stop plate 321 and the chain 1. The sprocket spokes are provided with sprocket inner fixing holes, and the inner stop plate 321 is provided with inner stop plate mounting holes 324 that match the sprocket inner fixing holes. The inner stop plate 321 is fixed to the sprocket spokes by bolts passing through the inner stop plate mounting holes 324 and the sprocket inner fixing holes. The outer edge of the inner stop plate 321 is 2-8 mm higher than the sprocket tooth ring, and the size of the second gap is 2-8 mm.

[0018] The reason only an inner chain guard plate was used is that when riding in mountainous terrain, rocks often impact the chain from the outside in. Therefore, it is only necessary to prevent the chain from deviating inward from the gears on the sprocket ring. Since the inner chain guard plate is fixed to the inner side of the sprocket spokes, utilizing the initial gap between the sides of the sprocket spokes and the sprocket ring and the rear wheel, the inner chain guard plate only surrounds the sprocket ring and part of the sprocket spokes, essentially only enclosing half of the hub. There are no changes to the original sprocket hub and installation structure. Compared to existing technologies, this simple installation structure effectively prevents the chain from falling off.

[0019] like Figure 5 , Figure 6 , Figure 9 and Figure 10As shown in Embodiment 2, an off-road vehicle sprocket is provided. The off-road motorcycle employs a mid-mounted power unit, transmitting power to a sprocket 3 fixed to the outwardly protruding rear wheel hub 2 via a chain 1. The sprocket 3 includes a sprocket hub, sprocket spokes, and a sprocket gear ring. A first gap 41 exists between the sides of the sprocket spokes and the sprocket gear ring and the rear wheel. The sprocket hub has sprocket hub mounting holes, and the sprocket is fixed to the rear wheel hub 2 by bolts passing through the sprocket hub mounting holes. An inner chain guard plate 321 is fixed on the inner side of the sprocket spokes. The inner chain guard plate 321 is located within the first gap 41 and has a gap with the rear wheel 4. The inner chain guard plate is a curved circular ring plate. The inner ring of the curved circular plate extends and fits towards the sprocket spokes, while the outer ring of the curved circular plate is away from the sprocket tooth ring. The upper edge of the inner stop plate 321 is higher than the sprocket tooth ring. A second gap 320 exists between the inner stop plate 321 and the chain 1. An outer stop plate 322 is fixed on the outer surface of the sprocket spokes. The outer stop plate is a curved circular plate, with its inner ring extending and fitting towards the sprocket spokes. The outer ring of the curved circular plate is away from the sprocket tooth ring, and the upper edge of the outer stop plate 322 is higher than the sprocket tooth ring. A third gap 330 exists between the outer stop plate 322 and the chain 1. The outer stop plate and the inner stop plate are symmetrical to each other. The sprocket spokes are provided with inner sprocket fixing holes. The inner chain guard plate 321 is provided with inner chain guard plate mounting holes 324 that match the inner sprocket fixing holes. Bolts are passed through the inner chain guard plate mounting holes 324 and the inner sprocket fixing holes to fix the inner chain guard plate 321 onto the sprocket spokes. The sprocket spokes are provided with outer sprocket fixing holes. The outer chain guard plate 322 is provided with outer chain guard plate mounting holes 326 that match the outer sprocket fixing holes. Bolts are passed through the outer chain guard plate mounting holes 326 and the outer sprocket fixing holes to fix the outer chain guard plate 322 onto the sprocket spokes. The outer edge of the inner chain guard plate 321 protrudes 2-8mm above the sprocket tooth ring, and the second gap is 2-8mm. The outer edge of the outer chain guard plate protrudes 2-8mm above the sprocket tooth ring, and the third gap is 2-8mm.

[0020] The above technical solution employs double-sided protection with both outer and inner chain guard plates. However, it differs from existing technologies in terms of space limitations and installation methods. By using both inner and outer chain guard plates to prevent chain detachment, this structure also simplifies chain installation compared to existing technologies. Since the outer and inner chain guard plates are fixed to the inner side of the sprocket spokes, they only enclose the sprocket gear ring and part of the sprocket spoke sides. The inner chain guard plate is added using the original protruding rear wheel hub and the original first clearance space. There are no changes to the original sprocket hub or installation structure. Compared to existing technologies, this simple installation structure effectively prevents chain detachment.

[0021] The outer and inner chain guard plates in the aforementioned technical solution serve two purposes: firstly, to ensure the inner ring fits snugly onto the sprocket spokes; and secondly, to ensure the outer ring is far from the sprocket teeth, creating a gap between the outer ring and the chain to prevent interference with chain operation. Simultaneously, they prevent the chain from detaching from the sprocket upon impact. This technical solution is not limited by these limitations. The purpose of the gap in this technical solution is to ensure that the outer and inner chain guard plates do not interfere with the rear wheel and chain during rotation. Both the inner and outer chain guard plates are made of aluminum alloy, which has high strength, good casting and plasticity, good corrosion resistance, and machinability. A typical gap of 2-8mm is recommended, with a minimum gap of 2mm to better ensure operation and accommodate slight deformation of the sprocket spokes. However, the gap cannot be too large, ensuring the chain does not detach from the sprocket and become stuck in the gap. Since the width of chains used in off-road vehicles is generally not 8.9mm, a gap of no more than 8mm is sufficient to prevent the chain from detaching from the sprocket.

[0022] This technical solution has a simple structure and does not change the original sprocket installation structure. It simply uses bolts to attach the inner and outer chain guards or directly welds them to the side of the sprocket spokes. This simple installation structure can effectively prevent the chain from falling off.

[0023] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A sprocket for an off-road vehicle, wherein the off-road motorcycle employs a mid-mounted power unit, and power is transmitted via a chain to a sprocket fixed to an outwardly protruding rear wheel hub. The sprocket includes a sprocket hub, sprocket spokes, and a sprocket tooth ring. A first gap exists between the sides of the sprocket spokes and the sprocket tooth ring and the rear wheel. The sprocket hub is provided with a sprocket hub mounting hole, and the sprocket is fixed to the rear wheel hub by bolts passing through the sprocket hub mounting hole. The sprocket is characterized in that: An inner stop chain plate is fixed on the inner side of the sprocket spokes. The inner stop chain plate is located within the first gap and there is a gap between the inner stop chain plate and the rear wheel. The inner stop chain plate is a curved circular ring plate. The inner ring of the curved circular ring plate extends and fits the sprocket spokes, and the outer ring of the curved circular ring plate is away from the sprocket tooth ring. The upper edge of the inner stop chain plate is higher than the sprocket tooth ring. There is a second gap between the inner stop chain plate and the chain.

2. The off-road vehicle sprocket according to claim 1, characterized in that: An outer stop chain plate is fixed on the outer surface of the sprocket spokes. The outer stop chain plate is a curved circular ring plate. The inner ring of the curved circular ring plate extends and fits the sprocket spokes. The outer ring of the curved circular ring plate is away from the sprocket tooth ring. The upper edge of the outer stop chain plate is higher than the sprocket tooth ring. There is a third gap between the outer stop chain plate and the chain.

3. The off-road vehicle sprocket according to claim 2, characterized in that: The outer and inner chain plates are symmetrical to each other.

4. The off-road vehicle sprocket according to claim 1, characterized in that: The sprocket spokes are provided with sprocket inner fixing holes, and the inner stop chain plate is provided with inner stop chain plate mounting holes that match the sprocket inner fixing holes. The inner stop chain plate is fixed to the sprocket spokes by bolts passing through the inner stop chain plate mounting holes and the sprocket inner fixing holes.

5. A sprocket for off-road vehicles according to claim 2, characterized in that: The sprocket spokes are provided with sprocket outer fixing holes, and the outer stop chain plate is provided with an outer stop chain plate mounting hole that matches the sprocket outer fixing hole. The outer stop chain plate is fixed to the sprocket spokes by bolts passing through the outer stop chain plate mounting hole and the sprocket outer fixing hole.

6. A sprocket for off-road vehicles according to claim 1, characterized in that: The outer edge of the inner chain guard plate is 2-8mm higher than the sprocket tooth ring.

7. A sprocket for off-road vehicles according to claim 2, characterized in that: The outer edge of the outer chain guard plate is 2-8mm higher than the sprocket tooth ring.

8. A sprocket for off-road vehicles according to claim 1, characterized in that: The size of the second gap is 2-8 mm.

9. A sprocket for an off-road vehicle according to claim 2, characterized in that: The size of the third gap is 2-8 mm.

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