Tensioning device and engine

Abstract

A kind of tensioner and engine, including camshaft located on cylinder head and timing driven sprocket located on camshaft and timing drive sprocket installed on crankshaft, timing drive sprocket is powered to timing driven sprocket by timing chain, tensioner combination is installed outside timing chain and is tensioned to timing chain, chain tensioning plate is arranged between tensioner combination and timing chain, the chain tensioning plate is contacted with timing chain, recess is arranged on the chain tensioning plate along the length direction of chain tensioning plate, and the recess opening is towards timing chain. By setting recess on the working surface of chain tensioning plate, oil can be stored, oil from timing chain operation and camshaft rotation splash oil can be entered into recess for storage, so as to provide lubricating oil for timing chain and chain tensioning plate, reduce wear caused by temperature rise and poor lubrication, so as to guarantee the working performance of engine, and improve the service life of engine.

Description

Technical Field

[0001] This utility model relates to the field of engines, and in particular to a transmission tensioning device and an engine. Background Technology

[0002] In existing engine tensioning systems, especially in engines with small cylinder inclination angles, the timing chain chamber houses the valve train. The timing chain and tensioner plate experience friction during contact, requiring lubrication. However, in engines with small cylinder inclination angles, the tensioner assembly and tensioner plate are located at the top. During engine operation, the amount of oil generated by the timing chain and splashed from the camshaft is relatively small, limiting lubrication of the timing chain and tensioner plate. Furthermore, there is no structure in the engine that actively supplies lubricating oil to the timing chain and tensioner plate; lubrication is primarily achieved through splash lubrication. In existing designs, the tensioner plate lacks an oil reservoir. Lubrication for the timing chain and tensioner plate may come from oil dripping from the cylinder head cap or splashed from the camshaft. Areas far from these dripping or splashing oil may experience insufficient lubrication, increasing friction and leading to severe wear on the tensioner plate. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a tensioning device, which provides an oil storage groove in the chain tensioning plate structure of the tensioning device, so that the timing chain and the chain tensioning plate can be adequately lubricated, thereby reducing the wear of the chain tensioning plate and the timing chain and improving their service life.

[0004] A tensioning device includes a camshaft located on a cylinder head and a timing driven sprocket located on the camshaft, and a timing drive sprocket mounted on a crankshaft. The timing drive sprocket transmits power to the timing driven sprocket through a timing chain. A tensioner assembly is installed on the outside of the timing chain to tension the timing chain. A chain tensioning plate is provided between the tensioner assembly and the timing chain. The chain tensioning plate contacts and engages with the timing chain. A groove is provided on the chain tensioning plate along the length direction of the chain tensioning plate, and the opening of the groove faces the timing chain. By incorporating grooves in the chain tensioner plate that mates with the timing chain, lubricating oil splashed from the timing chain and camshaft during rotation can be stored in these grooves. As the timing chain moves, the lubricating oil in the grooves gradually drips onto the chain, and the oil gradually flows down the bottom of the grooves towards lower positions, thus providing lubrication to areas with less lubrication. This increases lubrication between the timing chain and the chain tensioner plate, as well as between the timing chain and the timing sprockets, thereby reducing wear on the timing chain and sprockets, lowering the operating temperature of the timing chain, and contributing to stable engine performance and extended service life.

[0005] Furthermore, the longitudinal section of the chain tensioner plate mating with the timing chain has a U-shaped structure, and the groove is located in the middle of the bottom of the U-shaped structure. This structure ensures that the timing chain is located in the U-shaped structure and can store lubricating oil in the groove, improving the lubrication of the timing chain. During operation, the lubricating oil can also reduce the temperature on the chain, ensuring its normal operation.

[0006] Furthermore, the timing chain portion that cooperates with the chain tensioner is located within the U-shaped structure. By setting the U-shaped structure, it is possible to ensure that the timing chain operates within the range of the chain tensioner, while also ensuring the tension of the timing chain by the chain tensioner, thus guaranteeing the normal operation of the engine.

[0007] Furthermore, a chain guide plate is also provided on the opposite side of the chain tensioner plate. The chain guide plate guides the timing chain, and the mating part between the chain guide plate and the timing chain has a U-shaped structure. By providing the chain guide plate, the operation of the timing chain can be further guided, preventing it from deviating and malfunctioning.

[0008] Furthermore, one end of the chain guide plate is close to and directly below the timing drive sprocket, and the other end is close to and directly below the timing driven sprocket. By positioning the chain guide plate directly below the timing driven sprocket that engages with the timing chain, the timing chain can be better guided, thereby ensuring the engagement of the timing chain with both the timing drive and timing driven sprockets, and thus ensuring the normal operation of the engine.

[0009] Furthermore, the groove is a rectangular groove, and the direction of the rectangular groove along its length conforms to the shape of the chain tensioner plate. By designing the groove to conform to the shape of the chain tensioner plate and changing with the shape of the chain tensioner plate, it is possible to ensure that the lubricating oil stored in the groove better lubricates the timing chain.

[0010] This invention also provides an engine equipped with the tensioning device described above. An engine equipped with this tensioning device can ensure normal engine operation and extend engine lifespan.

[0011] The beneficial effects of this invention are as follows: By adding grooves to the working surfaces of the timing chain and the chain tensioner plate to store oil, the oil driven by the timing chain and the splashed oil from the camshaft rotation can be stored in the grooves of the chain tensioner plate through the timing chain. This provides a continuous supply of lubricating oil to the timing chain and the chain tensioner plate, ensuring sufficient lubrication of their surfaces and reducing friction and wear. The oil in the grooves also lowers the operating temperature of the timing chain, further reducing wear caused by temperature rise and poor lubrication, thereby ensuring engine performance and extending engine life. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the engine structure; Figure 2 This is a schematic diagram of the structure of the timing chain and the chain tensioning plate of this utility model. Figure 3 A schematic diagram of the structure of the chain tensioning plate of this utility model with a groove; Figure 4 for Figure 3 Enlarged view of the AA section. Detailed Implementation

[0013] Figure 1 This is a schematic diagram of the engine structure; Figure 2 This is a schematic diagram of the structure of the timing chain and the chain tensioning plate of this utility model. Figure 3 A schematic diagram of the structure of the chain tensioning plate of this utility model with a groove; Figure 4 for Figure 3 AA sectional view, such as Figure 1-3As shown, the engine in this utility model is an engine with a cylinder inclination angle of 9°, including a crankcase 1, a cylinder block 2 mounted on the crankcase, and a cylinder head 3 mounted on the cylinder block. A cylinder head cover 4 covers the cylinder head. A chain chamber is provided on one side of the engine, and a power transmission device is provided in the chain chamber, including a camshaft 13 located on the cylinder head, timing driven sprockets 8 and 9 located on the camshaft 13, and a timing drive sprocket 11 mounted on the crankshaft 12. The timing drive sprocket 11 transmits power to the timing driven sprockets 8 and 9 through a timing chain 7. A tensioner assembly 5 is installed on the outside to tension the timing chain 7. A chain tensioning plate 6 is provided between the tensioner assembly and the timing chain. The chain tensioning plate 6 is in contact with the timing chain 7. The tensioner assembly is installed in the mounting hole on the side of the cylinder block. At the same time, the tensioner assembly and the chain tensioning plate are located on top. The top cover of the tensioner assembly presses against the back of the chain tensioning plate 6. The end of the chain tensioning plate 6 near the crankshaft 12 is mounted on the housing by a pin and can rotate around the pin. A groove 14 is provided on the chain tensioning plate along the length of the chain tensioning plate. The opening of the groove 14 faces the timing chain. By creating grooves in the chain tensioner plate that mates with the timing chain, the oil driven by the timing chain and the lubricating oil splashed from the camshaft rotation can be stored in the grooves. As the timing chain moves, the lubricating oil in the grooves gradually drips onto the timing chain, increasing lubrication between the timing chain and the chain tensioner plate. This helps reduce wear on the timing chain and sprockets, lowers the operating temperature of the timing chain, and contributes to stable engine performance and extended service life.

[0014] In this embodiment: as shown in Figure 4, the longitudinal cross-section of the mating part between the chain tensioning plate 6 and the timing chain 7 is U-shaped, and the groove is located in the middle of the bottom of the U-shaped structure. This structure ensures that the timing chain is located in the U-shaped structure and can store lubricating oil in the groove, improving the lubrication of the timing chain. Furthermore, during operation, the lubricating oil can reduce the temperature on the chain, ensuring its normal operation.

[0015] In this embodiment: as Figure 2 , 3 As shown, the timing chain 7 that cooperates with the chain tensioner 6 is located within the U-shaped structure. By setting the U-shaped structure, it is possible to ensure that the timing chain operates within the range of the chain tensioner, while also ensuring the tension of the timing chain by the chain tensioner, thus ensuring the normal operation of the engine.

[0016] In this embodiment: as Figure 2As shown, a chain guide plate 10 is also provided on the opposite side of the chain tensioning plate. The chain guide plate 10 guides the timing chain, and the mating part between the chain guide plate and the timing chain has a U-shaped structure. By providing the chain guide plate, the operation of the timing chain can be guided, preventing it from deviating and malfunctioning.

[0017] In this embodiment: as Figure 2 As shown, one end of the chain guide plate 10 is close to and directly below the timing drive sprocket, and the other end is close to and directly below the timing driven sprocket. One end of the chain guide plate is inserted into the mounting groove of the crankcase, and the other end is limited and fixed by the cylinder head limiting part. By positioning the chain guide plate directly below the timing drive sprocket that meshes with the timing chain, the timing chain can be better guided, thereby ensuring the meshing of the timing chain with the timing drive sprocket and the timing driven sprocket, and thus ensuring the normal operation of the engine.

[0018] In this embodiment: as Figure 2 , 3 As shown in Figure 4, the groove is a rectangular groove, and its length direction conforms to the shape of the chain tensioner plate. The chain tensioner plate has an overall arc-shaped structure, bulging outward towards the inside of the timing chain. The groove also bulges outward, conforming to the inward contraction of the timing chain when it is tensioned. By designing the groove to conform to the shape of the chain tensioner plate, and allowing it to change with the shape of the chain tensioner plate, the lubricating oil stored in the groove can be better lubricated to the timing chain. Note: Here, "outward" refers to relative to the chain tensioner plate.

[0019] This utility model also provides an engine, such as Figure 1 As shown, the engine is equipped with the tensioning device described above. The engine equipped with this tensioning device ensures normal engine operation and extends engine lifespan.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tensioning device, comprising a camshaft located on a cylinder head and a timing driven sprocket located on the camshaft, and a timing drive sprocket mounted on a crankshaft, wherein the timing drive sprocket transmits power to the timing driven sprocket via a timing chain, a tensioner assembly is mounted on the outside of the timing chain to tension the timing chain, and a chain tensioning plate is disposed between the tensioner assembly and the timing chain, wherein the chain tensioning plate contacts and engages with the timing chain, characterized in that: A groove is provided on the chain tensioning plate along the length of the chain tensioning plate, and the opening of the groove faces the timing chain.

2. The tensioning device according to claim 1, characterized in that... The longitudinal cross-section of the chain tensioning plate that engages with the timing chain is U-shaped, and the groove is located in the middle of the bottom of the U-shaped structure.

3. The tensioning device according to claim 2, characterized in that: The timing chain portion that cooperates with the chain tensioner is located within the U-shaped structure.

4. The tensioning device according to claim 2, characterized in that: A chain guide plate is also provided on the opposite side of the chain tensioning plate. The chain guide plate guides the timing chain, and the mating part between the chain guide plate and the timing chain has a U-shaped structure.

5. The tensioning device according to claim 4, characterized in that: One end of the chain guide plate is close to and directly below the timing drive sprocket, and the other end is close to and directly below the timing driven sprocket.

6. The tensioning device according to claim 2, characterized in that: The groove is a rectangular groove, and the direction of the rectangular groove along its length conforms to the shape of the chain tensioning plate.

7. An engine, characterized in that: The engine is equipped with a tensioning device as described in any one of claims 1-6.

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