Rubber-coated steel automatic tensioning device for engine
By designing a rubber-clad steel automatic tensioning device for engines, the problems of large space, high cost and complex structure of tensioner plates and tensioners in the prior art are solved, and space saving, weight reduction, manufacturing cost reduction and tension stability are achieved.
Patent Information
- Application Number
- CN202420491888.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-14
AI Technical Summary
In the prior art, tensioning plates using PA66 or PA46 plastic materials must be designed with the tensioner, resulting in large space for tensioner and tensioner design, high cost and complex structure, which conflicts with the design direction of miniaturization and lightweight vehicle engines.
An automatic tensioning device for engines is designed, including arc spring steel plates, nitrile rubber, polytetrafluoroethylene coating and anti-reversing ratchet mechanism. The arc spring steel plate forms the skeleton of the tensioning device, outsourced nitrile rubber, and a polytetrafluoroethylene coating on the chain contact surface. The anti-reversing ratchet mechanism prevents the skeleton from rebounding under the impact of the chain, ensuring the stability of the tensioning force.
Through this design, the full functions of the tensioner plate and tensioner are replaced, the space structure is saved, the device weight is reduced, the manufacturing cost is reduced, and the buffering performance and tension force stability are improved.
Smart Images
Figure CN222559098U_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of chain tensioning devices, and in particular relates to a rubber-coated steel automatic tensioning device for an engine. Background Art
[0002] Currently in the vehicle manufacturing, internal combustion engine and other mechanical industries, the tension plate is an important part of the engine timing system. It is installed at the front end of the cylinder block or cylinder head and cooperates with the tensioner as a rotating pair to tighten and guide the chain from the crankshaft to the camshaft, while compensating for the deformation of the running track line after the timing chain is worn and elongated.
[0003] The tension plate works in a very harsh environment, bearing the positive pressure of the chain, friction, tensioner force and high temperature of the crankcase. Therefore, in order to ensure the stability of the engine timing system, strict requirements are placed on the strength, rigidity and wear resistance of the moving guide rail.
[0004] The engine space is limited, and the timing system needs to be designed in a small space and meet the use requirements: the chain does not damage the tension plate under high-speed friction and the maximum deformation under high pressure is less than 2mm. The tension plate using existing PA66 or PA46 plastic materials must be designed with a tensioner, resulting in a large space occupation, high cost, and complex structure for the tension plate and tensioner design, which conflicts with the current design direction of miniaturization and lightweighting of vehicle engines. Utility Model Content
[0005] In view of the problems of the prior art, the present invention discloses a rubber-coated steel automatic tensioning device for an engine, the purpose of which is to solve the problem in the prior art that the tensioning plate made of the existing PA66 or PA46 plastic material must be designed in conjunction with a tensioner, resulting in a large space occupation for the tensioning plate and the tensioner, high cost, and complex structure, which conflicts with the current design direction of miniaturization and lightweight of vehicle engines.
[0006] To achieve the above purpose, the technical solution of this novel invention is:
[0007] A rubber-coated steel automatic tensioning device for an engine comprises an arc spring steel plate, nitrile rubber, a polytetrafluoroethylene coating and an anti-reverse ratchet mechanism, wherein the arc spring steel plate constitutes the skeleton of the tensioning device, the skeleton is coated with nitrile rubber, the protruding side of the arc spring steel plate constitutes a chain contact surface, the chain contact surface is provided with a polytetrafluoroethylene coating, one end of the arc spring steel plate is curled into an annular structure, a shaft sleeve is provided in the annular structure, a fixed shaft is embedded in the shaft sleeve, an anti-reverse ratchet mechanism is provided between the fixed shaft and the inner wall of the shaft sleeve or between the outer wall of the shaft sleeve and the inner wall of the annular structure, when the anti-reverse ratchet mechanism is provided between the fixed shaft and the inner wall of the shaft sleeve, the outer wall of the shaft sleeve is fixedly connected to the inner wall of the annular structure, when the anti-reverse ratchet mechanism is provided between the outer wall of the shaft sleeve and the inner wall of the annular structure, the inner wall of the shaft sleeve is fixedly connected to the outer wall of the fixed shaft; the fixed shaft and the skeleton are connected via a torsion spring.
[0008] Preferably, the cross-section of the nitrile rubber is an H-shaped structure, the lower part of the H-shaped structure is coated on the top and side of the arc spring steel plate, the upper part of the H-shaped structure constitutes a groove-shaped contact surface in contact with the chain, and the bottom of the groove-shaped contact surface is provided with a polytetrafluoroethylene coating.
[0009] Preferably, the arc spring steel plate is made of 65Mn steel plate.
[0010] Preferably, when an anti-reversal ratchet mechanism is provided between the fixed shaft and the inner wall of the sleeve, the anti-reversal ratchet mechanism includes a plurality of ratchets evenly arranged on one side of the outer surface of the fixed shaft, a sliding groove is radially provided on the inner wall of the sleeve, a wedge block is slidably connected in the sliding groove, a compression spring is connected between the top of the wedge block and the top of the sliding groove, a first sliding inclined surface is provided on the side of the bottom of the wedge block facing the ratchet, a second sliding inclined surface is provided on the end of the ratchet facing the wedge block, the first sliding inclined surface and the second sliding inclined surface are slidably matched, a first vertical surface is provided on the end of the ratchet away from the wedge block, a second vertical surface is provided on the end of the wedge block away from the ratchet, the first vertical surface and the second vertical surface are used in combination, the top of the ratchet is an arcuate surface, and the arcuate surface is slidably matched with the inner surface of the sleeve.
[0011] Preferably, one end of the fixed shaft away from the annular structure is fixedly connected to the casing or base of the engine.
[0012] The beneficial effects of the new rubber-coated steel automatic tensioning device for engines are:
[0013] 1. The present invention replaces all functions of the tensioning plate and tensioner in the existing design through the above design. On the other hand, through the above arrangement, the present invention combines all functions of the existing tensioner and tensioning plate, saves space structure, reduces device weight, and reduces the manufacturing cost of the tensioning system.
[0014] 2. This new model uses nitrile rubber + polytetrafluoroethylene coating to ensure the hardness of the contact surface. Nitrile rubber has better buffering performance than the existing plastic tensioning plate. The anti-reversal ratchet mechanism can prevent the skeleton from rebounding backwards under the impact pressure of the chain, ensuring the stability of the tensioning force. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 , a schematic diagram of the top view structure of the new model.
[0016] Figure 2 , this new type Figure 1 Schematic diagram of the structure in the AA direction.
[0017] Figure 3 , this new type Figure 2 BB structural diagram.
[0018] Figure 4 , this new type Figure 2 Schematic diagram of the CC structure.
[0019] Figure 5 , diagram showing the torque of the new torsion spring and the torque of the tension plate.
[0020] Figure 6 , a schematic diagram of an implementation method of an anti-reverse ratchet mechanism.
[0021] 1. Arc spring steel plate; 11. Anti-reverse ratchet mechanism; 2. Nitrile rubber; 3. Bushing; 31. Slide; 32. Wedge block; 33. Compression spring; 4. Polytetrafluoroethylene coating; 5. Chain contact surface; 6. Fixed shaft; 61. Ratchet; 7. Ring structure; 8. Torsion spring. DETAILED DESCRIPTION
[0022] 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.
[0023] 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.
[0024] Example 1
[0025] A rubber-coated steel automatic tensioning device for an engine, such as Figure 1 , 2As shown, it includes an arc spring steel plate 1, nitrile rubber 2, polytetrafluoroethylene coating 4, and an anti-reverse ratchet mechanism 11. The arc spring steel plate 1 constitutes the skeleton of the tensioning device, and the skeleton is coated with nitrile rubber 2. The protruding side of the arc spring steel plate 1 constitutes a chain contact surface 5, and the chain contact surface 5 is provided with a polytetrafluoroethylene coating 4. One end of the arc spring steel plate 1 is curled into an annular structure 7, and a sleeve 3 is provided in the annular structure 7. A fixed shaft 6 is embedded in the sleeve 3. An anti-reverse ratchet mechanism 11 is provided between the fixed shaft 6 and the inner wall of the sleeve 3 or between the outer wall of the sleeve 3 and the inner wall of the annular structure 7. When the anti-reverse ratchet mechanism 11 is provided between the fixed shaft 6 and the inner wall of the sleeve 3, the outer wall of the sleeve 3 is fixedly connected to the inner wall of the annular structure 7. When the anti-reverse ratchet mechanism 11 is provided between the outer wall of the sleeve 3 and the inner wall of the annular structure 7, the inner wall of the sleeve 3 is fixedly connected to the outer wall of the fixed shaft 6; the fixed shaft 6 and the skeleton are connected by a torsion spring 8.
[0026] In this embodiment, there are two ways to set the anti-reverse ratchet mechanism 11, namely: set between the fixed shaft 6 and the inner wall of the sleeve 3 or between the outer wall of the sleeve 3 and the inner wall of the annular structure 7. The anti-reverse ratchet mechanism is a common technology, and its implementation method can refer to the existing technical content.
[0027] Example 2
[0028] like Figure 3 As shown, the cross-section of the nitrile rubber 2 is an H-shaped structure, the lower part of the H-shaped structure is covered on the top and side of the arc spring steel plate 1, the upper part of the H-shaped structure constitutes a groove-shaped contact surface in contact with the chain, and the bottom of the groove-shaped contact surface is provided with a polytetrafluoroethylene coating 4.
[0029] Example 3
[0030] like Figure 1 , 2 As shown, the arc spring steel plate 1 is made of 65Mn steel plate.
[0031] Example 4
[0032] like Figure 5As shown, when an anti-reverse ratchet mechanism 11 is provided between the fixed shaft 6 and the inner wall of the sleeve 3, the anti-reverse ratchet mechanism 11 includes a plurality of ratchet teeth 61 evenly arranged on one side of the outer surface of the fixed shaft 6, a slide groove 31 is radially provided on the inner wall of the sleeve 3, a wedge block 32 is slidably connected in the slide groove 31, a compression spring 33 is connected between the top of the wedge block 32 and the top of the slide groove 31, a first sliding inclined surface is provided on the bottom of the wedge block 32 facing the ratchet 61, a second sliding inclined surface is provided on the end of the ratchet 61 facing the wedge block 32, the first sliding inclined surface and the second sliding inclined surface are slidably matched, a first vertical surface is provided on the end of the ratchet 61 away from the wedge block 32, a second vertical surface is provided on the end of the wedge block 31 away from the ratchet 61, the first vertical surface and the second vertical surface are used in combination, the top of the ratchet 61 is an arcuate surface, and the arcuate surface is slidably matched with the inner surface of the sleeve 3.
[0033] This embodiment provides a common implementation method of the anti-reversal ratchet mechanism 11, such as Figure 5 As shown, when the shaft sleeve 3 fixedly connected to the annular structure 7 rotates driven by the arc spring steel plate 1, the wedge block 32 is squeezed and contracted by the ratchet 61 and enters the slide groove 31. After the wedge block passes over the arc surface at the top of the ratchet, it is reset under the elastic force of the spring, and the second vertical surface of the wedge block abuts against the first vertical surface of the ratchet, forming a one-way rotation limit. It can be understood that when an anti-reversal ratchet mechanism is provided between the annular structure and the shaft sleeve, the anti-reversal ratchet mechanism can refer to the structural setting of this embodiment.
[0034] Example 5
[0035] like Figure 1-3 As shown, one end of the fixed shaft 6 away from the annular structure 7 is fixedly connected to the housing or base of the engine.
[0036] The use principle of this new model:
[0037] When the chain system is working, the tension plate torque fluctuates with the chain force, while the torque provided by the torsion spring is a stable value. During the operation of the system, the chain wears out, causing the tension plate to rotate and the tension force to decrease. When the minimum tension force (minimum frame torque) is less than the torsion spring torque, the torsion spring pushes the frame to rotate. When the frame rotates, the anti-reverse ratchet mechanism limits the rotation angle and prevents reversal, ensuring the stability of the tension force. Figure 1-3 As shown, the present invention replaces all functions of the tensioning plate and tensioner in the existing design through the above design. On the other hand, through the above arrangement, the present invention combines all functions of the existing tensioner and tensioning plate, saves space structure, reduces device weight, and reduces the manufacturing cost of the tensioning system.
[0038] The new type uses nitrile rubber + polytetrafluoroethylene coating to ensure the hardness of the contact surface. The nitrile rubber has better buffering performance than the existing plastic tensioning plate. The anti-reversal ratchet mechanism can prevent the skeleton from rebounding backwards under the impact pressure of the chain, ensuring the stability of the tensioning force.
Claims
1. A rubber-coated steel automatic tensioner for an engine, characterized by: It includes an arc spring steel plate, nitrile rubber, polytetrafluoroethylene coating, and an anti-reverse ratchet mechanism. The arc spring steel plate constitutes the skeleton of the tensioning device, and the skeleton is coated with nitrile rubber. The protruding side of the arc spring steel plate constitutes the chain contact surface, and the chain contact surface is provided with a polytetrafluoroethylene coating. One end of the arc spring steel plate is curled into an annular structure, and a shaft sleeve is provided in the annular structure. A fixed shaft is embedded in the shaft sleeve. An anti-reverse ratchet mechanism is provided between the fixed shaft and the inner wall of the shaft sleeve or between the outer wall of the shaft sleeve and the inner wall of the annular structure. When the anti-reverse ratchet mechanism is provided between the fixed shaft and the inner wall of the shaft sleeve, the outer wall of the shaft sleeve is fixedly connected to the inner wall of the annular structure. When the anti-reverse ratchet mechanism is provided between the outer wall of the shaft sleeve and the inner wall of the annular structure, the inner wall of the shaft sleeve is fixedly connected to the outer wall of the fixed shaft. The fixed shaft and the skeleton are connected by a torsion spring.
2. The rubber-coated steel automatic tensioner for an engine as claimed in claim 1, characterized in that: The cross section of the nitrile rubber is an H-shaped structure, the lower part of the H-shaped structure is covered on the top and side of the arc spring steel plate, the upper part of the H-shaped structure forms a groove-shaped contact surface in contact with the chain, and the bottom of the groove-shaped contact surface is provided with a polytetrafluoroethylene coating.
3. The rubber-coated steel automatic tensioner for an engine as claimed in claim 2, characterized in that: The arc spring steel plate is made of 65Mn steel plate.
4. A rubber-coated steel automatic tensioning device for an engine as described in claim 3, characterized in that: when an anti-reverse ratchet mechanism is provided between the fixed shaft and the inner wall of the sleeve, the anti-reverse ratchet mechanism includes a plurality of ratchets evenly arranged on one side of the outer surface of the fixed shaft, the inner wall of the sleeve is radially provided with a slide groove, a wedge block is slidably connected in the slide groove, a compression spring is connected between the top of the wedge block and the top of the slide groove, a first sliding inclined surface is provided on the side of the bottom of the wedge block facing the ratchet, a second sliding inclined surface is provided on an end of the ratchet facing the wedge block, the first sliding inclined surface and the second sliding inclined surface are slidably matched, a first vertical surface is provided on the end of the ratchet away from the wedge block, and a second vertical surface is provided on the end of the wedge block away from the ratchet, the first vertical surface and the second vertical surface are used in combination, the top of the ratchet is an arcuate surface, and the arcuate surface is slidably matched with the inner surface of the sleeve.
5. The rubber-coated steel automatic tensioner for an engine as claimed in claim 4, characterized in that: One end of the fixed shaft away from the annular structure is fixedly connected to the outer shell or base of the engine.