Self-adjusting tensioning type timing wet belt transmission device
By using a self-adjusting tensioning wet belt drive, the problem of reduced belt tension caused by wear and temperature changes is solved, achieving stable power transmission from the engine and extending belt life, while reducing friction and noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGLING MOTORS
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-17
AI Technical Summary
In traditional timing belt drive systems, belt tension decreases due to wear and temperature changes, affecting the stability of engine power output and service life. Furthermore, dry belt drive systems have high friction, high noise, and short lifespan.
The system employs a self-adjusting tensioning wet timing belt drive, which includes a VCT assembly, crankshaft timing pulley, timing belt, and self-adjusting timing tensioner. It utilizes oil lubrication and a spring system to automatically adjust the tension, ensuring that the belt maintains appropriate tension under different operating conditions.
It improves the stability of engine power transmission, extends belt life, reduces friction and noise, and reduces maintenance costs.
Smart Images
Figure CN224135113U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine technology, specifically to a self-adjusting tensioned wet timing belt drive device. Background Technology
[0002] Traditional timing belt drive systems have the following shortcomings:
[0003] a) In traditional engine timing belt drive systems, a fixed tensioning device is often used. As the engine runs for a long time, the belt will gradually stretch due to fatigue, wear, and other factors, resulting in a decrease in tension. Once the tension is insufficient, the belt is prone to skipping teeth, which will seriously affect the engine's valve timing and ignition timing, leading to unstable engine power output, increased fuel consumption, and even causing the engine to malfunction.
[0004] (b) During operation, dry belt drive systems generate significant friction between the belt and pulleys, which not only produces a large amount of heat, accelerating belt aging and wear, but also generates considerable noise, affecting driving comfort. Furthermore, dry belts have a relatively short lifespan and require regular replacement, increasing vehicle maintenance costs. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a self-adjusting tensioning wet belt drive for timing, which solves the problem that after the engine has been running for a long time, the belt will stretch due to wear, heat and other factors, resulting in a decrease in tension, which will affect the transmission accuracy and may cause problems such as engine vibration and power reduction.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a self-adjusting tensioning type timing wet belt drive device, comprising:
[0007] The VCT assembly is mounted on the end of the engine camshaft;
[0008] The crankshaft timing belt pulley is installed at the end of the engine crankshaft;
[0009] The timing belt is fitted between the VCT assembly and the crankshaft timing belt pulley;
[0010] The timing tensioner is located in the engine and its rotation is located in the engine. The outer side of the timing tensioner is in close contact with the timing belt.
[0011] The timing tensioner provides initial tension to the timing belt, keeping it at an appropriate tension to ensure the normal operation of the engine timing system.
[0012] Preferably, the timing belt includes:
[0013] The rubber body has a smooth surface and a toothed surface on its two sides, respectively.
[0014] Glass cord, which is embedded inside the rubber body;
[0015] The toothed canvas layer covers the rubber main tooth surface;
[0016] A Teflon layer is applied to the outside of the toothed canvas layer.
[0017] Preferably, the timing tensioner includes:
[0018] Pivot tube;
[0019] The working arm is movably sleeved on the outside of the pivot tube, and the axis of the working arm does not coincide with the axis of the pivot tube.
[0020] A conical spring is positioned between the outer side of the pivot tube and the inner wall of the working arm;
[0021] The main spring is located between the outer side of the pivot tube and the inner wall of the working arm;
[0022] The pulley assembly is fixedly sleeved on the outside of the working arm, and the outside of the pulley assembly is in contact with the timing belt;
[0023] The conical spring, together with the main spring, provides elastic support for the working arm and pulley assembly, thereby providing initial tension to the timing belt and driving the working arm to rotate when the timing belt slackens.
[0024] Preferably, a pivot bushing is movably sleeved on the outer side of the pivot tube, and the pivot bushing is fixedly connected to the inner wall of the working arm. The two ends of the main spring are respectively connected to the pivot tube and the pivot bushing, and the two ends of the conical spring are respectively connected to the pivot tube and the pivot bushing.
[0025] Preferably, the end of the pivot tube passes through the working arm and is fitted with an end cap, and a gasket is provided between the end cap and the working arm.
[0026] Preferably, a support plate is installed at the end of the pivot tube, and the support plate serves as a support for the overall structure, providing a mounting base for the timing tensioner.
[0027] Preferably, a damping pad is installed between the pivot tube and the support plate.
[0028] Preferably, the engine is further provided with a timing idler pulley, and the timing idler pulley is in contact with the timing belt.
[0029] This utility model discloses a self-adjusting tension-type timing wet belt drive device, which has the following beneficial effects:
[0030] 1. This self-adjusting tensioned wet timing belt drive is equipped with a unique self-adjusting timing tensioner. It automatically and precisely adjusts the tension based on the actual condition of the timing belt under different operating conditions, such as length changes due to wear or temperature variations. When the timing belt elongates, the tensioner automatically applies additional tension to ensure the timing belt maintains appropriate tension, guaranteeing stable power transmission while keeping the timing belt in an oil environment. On one hand, the oil provides excellent lubrication for the timing belt, significantly reducing the coefficient of friction between the timing belt and the VCT assembly, crankshaft timing pulley, and timing tensioner, thus reducing wear and extending belt life. On the other hand, the oil effectively removes heat generated during belt operation, preventing the timing belt material from deteriorating due to excessive temperature.
[0031] 2. This self-adjusting tensioning wet timing belt drive, during installation, has the main spring and conical spring in a pre-compressed state, providing initial tension to the timing belt and maintaining it at an appropriate tightness to ensure the normal operation of the engine timing system. With increased use, the timing belt may stretch due to wear and temperature changes, leading to slack. In this case, the elastic force of the main spring and conical spring pushes the working arm to rotate around the pivot tube, causing the pulley assembly to move in the direction of tensioning the belt. This movement of the pulley assembly tightens the timing belt, restoring its tension. When the timing belt contracts due to temperature decrease, the pressure on the pulley assembly increases. Under the action of the timing belt, the pulley assembly moves in the opposite direction, compressing the main spring and conical spring, allowing them to absorb the contraction of the timing belt and prevent it from becoming too tight. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0034] Figure 2 This is a schematic diagram of the timing tensioner of this utility model;
[0035] Figure 3 This is a schematic diagram of the timing belt of this utility model.
[0036] In the diagram: 1. VCT assembly; 2. Crankshaft timing pulley; 3. Timing belt; 31. Rubber body; 32. Glass cord; 33. Toothed canvas layer; 34. Teflon layer; 4. Timing tensioner; 41. Pivot tube; 42. Conical spring; 43. Main spring; 44. Pivot bushing; 45. End cap; 451. Gasket; 46. Pulley assembly; 47. Working arm; 48. Damping pad; 49. Support plate; 5. Timing idler pulley. Detailed Implementation
[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0038] This utility model discloses a self-adjusting tensioning type timing wet belt drive device.
[0039] According to the appendix Figure 1-3 As shown, it includes:
[0040] VCT assembly 1, which is mounted on the end of the engine camshaft;
[0041] Crankshaft timing pulley 2 is mounted on the end of the engine crankshaft;
[0042] The timing belt 3 is fitted between the VCT assembly 1 and the crankshaft timing belt pulley 2;
[0043] The timing tensioner 4 is located in the engine and its rotation is located in the engine. The outer side of the timing tensioner 4 is in close contact with the timing belt 3.
[0044] The timing tensioner 4 provides initial tension to the timing belt 3, keeping the timing belt 3 at an appropriate tension to ensure the normal operation of the engine timing system.
[0045] Equipped with a unique self-adjusting timing tensioner 4, it can automatically and precisely adjust the tension according to the actual condition of the timing belt 3 under different operating conditions, such as changes in length due to wear and temperature variations. When the timing belt 3 elongates, the timing tensioner 4 can automatically apply additional tension to ensure that the timing belt 3 always maintains appropriate tension, ensuring stable power transmission, and placing the timing belt 3 in an oil environment. On the one hand, the oil can provide good lubrication for the timing belt 3, greatly reducing the coefficient of friction between the timing belt 3 and the VCT assembly 1, crankshaft timing pulley 2, and timing tensioner 4, reducing wear and extending belt life; on the other hand, the oil can effectively remove the heat generated by the belt during operation, preventing the material properties of the timing belt 3 from deteriorating due to excessive temperature.
[0046] The crankshaft timing belt pulley 2 is mounted on the engine crankshaft and connected to the VCT assembly 1 on the camshaft via the timing belt 3, thereby controlling the engine's valve timing. The timing tensioner 4 is located on the slack side of the timing belt 3 and is close to the VCT assembly 1, allowing for more effective adjustment of the timing belt 3 tension.
[0047] Specifically disclosed, the timing belt 3 includes:
[0048] The rubber body 31 has a smooth surface and a toothed surface on its two sides, respectively.
[0049] Glass cord 32, which is embedded inside the rubber body 31;
[0050] The toothed canvas layer 33 covers the tooth surface of the rubber body 31.
[0051] Teflon layer 34 is coated on the outside of the toothed canvas layer 33.
[0052] The timing belt 3 is a wet belt made of special materials. The rubber body 31 is made of HNBR rubber material that is resistant to deteriorating oil, and the inside is made of high-strength oil-resistant glass cord 32. The tooth surface is increased with a tooth canvas layer 33 and a Teflon layer 34, which can maintain good transmission performance in wet environments and has high strength and wear resistance.
[0053] Specifically disclosed, the timing tensioner 4 includes:
[0054] Pivot tube 41;
[0055] The working arm 47 is movably sleeved on the outside of the pivot tube 41, and the axis of the working arm 47 does not coincide with the axis of the pivot tube 41.
[0056] A conical spring 42 is disposed between the outer side of the pivot tube 41 and the inner wall of the working arm 47;
[0057] The main spring 43 is disposed between the outer side of the pivot tube 41 and the inner wall of the working arm 47;
[0058] The pulley assembly 46 is fixedly sleeved on the outside of the working arm 47, and the outside of the pulley assembly 46 is in contact with the timing belt 3;
[0059] The conical spring 42, together with the main spring 43, provides elastic support for the working arm 47 and the pulley assembly 46, thereby providing initial tension to the timing belt 3 and pushing the working arm 47 to rotate when the timing belt 3 slackens.
[0060] Specifically disclosed, a pivot bushing 44 is movably sleeved on the outer side of the pivot tube 41, and the pivot bushing 44 is fixedly connected to the inner wall of the working arm 47. The two ends of the main spring 43 are respectively connected to the pivot tube 41 and the pivot bushing 44, and the two ends of the conical spring 42 are respectively connected to the pivot tube 41 and the pivot bushing 44.
[0061] Specifically disclosed, the end of the pivot tube 41 passes through the working arm 47 and is fitted with an end cap 45, and a gasket 451 is provided between the end cap 45 and the working arm 47.
[0062] Furthermore, a support plate 49 is installed at the end of the pivot tube 41. The support plate 49 serves as a support for the overall structure and provides a mounting base for the timing tensioner 4.
[0063] Furthermore, a damping pad 48 is installed between the pivot tube 41 and the support plate 49.
[0064] Throughout the entire operation, the damping pad 48 continues to function, absorbing the vibrations and impacts caused by the tension changes of the timing belt 3 and the adjustment action of the timing tensioner 4, ensuring that the adjustment process of the timing tensioner 4 is carried out smoothly, reducing component wear, and maintaining the stable operation of the engine timing system.
[0065] Furthermore, a timing idler pulley 5 is rotatably installed in the engine, and the timing idler pulley 5 is in contact with the timing belt 3.
[0066] During installation, the main spring 43 and the conical spring 42 are in a pre-compressed state, providing initial tension to the timing belt 3 and maintaining it at an appropriate tension to ensure the normal operation of the engine timing system. With increased use, the timing belt 3 may stretch due to wear and temperature changes, leading to slack. In this case, the elastic force of the main spring 43 and the conical spring 42 will push the working arm 47 to rotate around the pivot tube 41, causing the pulley assembly 46 to move in the direction of tensioning the belt. This movement of the pulley assembly 46 will tighten the timing belt 3, restoring its tension. When the timing belt 3 contracts due to temperature decrease, the pressure on the pulley assembly 46 increases. Under the action of the timing belt 3, the pulley assembly 46 will move in the opposite direction, compressing the main spring 43 and the conical spring 42, allowing them to absorb the contraction of the timing belt 3 and preventing it from becoming too tight.
[0067] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A self-adjusting tensioned timing wet-belt drive characterized by, include: VCT assembly (1), which is mounted on the end of the engine camshaft; Crankshaft timing pulley (2), which is installed at the end of the engine crankshaft; The timing belt (3) is fitted between the VCT assembly (1) and the crankshaft timing pulley (2); The timing tensioner (4) is rotated in the engine, and the outer side of the timing tensioner (4) is in close contact with the timing belt (3); The timing tensioner (4) provides initial tension to the timing belt (3), keeping the timing belt (3) at an appropriate tension to ensure the normal operation of the engine timing system.
2. A self-adjusting, tensioned, timing, wet-belt drive as set forth in claim 1, wherein, The timing belt (3) includes: The rubber body (31) has a smooth surface and a toothed surface on its two sides, respectively. Glass cord (32), which is embedded inside the rubber body (31); The toothed canvas layer (33) covers the toothed surface of the rubber body (31); A Teflon layer (34) is coated on the outside of the toothed canvas layer (33).
3. A self-adjusting, tensioned, timing, wet-belt drive as set forth in claim 1, wherein, The timing tensioner (4) includes: Pivot tube (41); The working arm (47) is movably sleeved on the outside of the pivot tube (41), and the axis of the working arm (47) does not coincide with the axis of the pivot tube (41); A conical spring (42) is disposed between the outer side of the pivot tube (41) and the inner wall of the working arm (47); The main spring (43) is located between the outer side of the pivot tube (41) and the inner wall of the working arm (47); The pulley assembly (46) is fixedly sleeved on the outside of the working arm (47), and the outside of the pulley assembly (46) is in contact with the timing belt (3); The conical spring (42), together with the main spring (43), provides elastic support for the working arm (47) and the pulley assembly (46), thereby providing initial tension to the timing belt (3) and pushing the working arm (47) to rotate when the timing belt (3) slackens.
4. A self-adjusting, tensioned, timing, wet-belt drive as set forth in claim 3, wherein, The pivot tube (41) is movably fitted with a pivot bushing (44), and the pivot bushing (44) is fixedly connected to the inner wall of the working arm (47). The two ends of the main spring (43) are connected to the pivot tube (41) and the pivot bushing (44) respectively, and the two ends of the conical spring (42) are connected to the pivot tube (41) and the pivot bushing (44) respectively.
5. The self-adjusting tensioning type timing wet belt drive device according to claim 3, characterized in that, The end of the pivot tube (41) passes through the working arm (47) and is fitted with an end cap (45), and a gasket (451) is provided between the end cap (45) and the working arm (47).
6. A self-adjusting, tensioned, timing, wet-belt drive as set forth in claim 3, wherein, The pivot tube (41) is fitted with a support plate (49) at its end. The support plate (49) serves as a support for the overall structure and provides a mounting base for the timing tensioner (4).
7. A self-adjusting, tensioned, timing, wet-belt drive as defined in claim 6, wherein, A damping pad (48) is installed between the pivot tube (41) and the support plate (49).
8. A self-adjusting, tensioned, timing, wet-belt drive as set forth in claim 1, wherein, The engine is also equipped with a timing idler pulley (5), which is in contact with the timing belt (3).