Timing tensioning wheel bearing capable of preventing belt from falling off
By optimizing the timing tensioner bearing for preventing belt slippage using an eccentric sleeve and spring structure, the problem of insufficient tension is solved, ensuring belt stability and system reliability, preventing belt slippage, and extending system life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2026-03-31
AI Technical Summary
The existing tensioner has insufficient tension, which makes the belt prone to loosening and falling off in the engine, affecting the stability and lifespan of the transmission system, especially in high-torque models.
A timing tensioner bearing designed to prevent belt slippage provides greater tension by optimizing the eccentric sleeve and spring structure, and improves sealing and stability by using an H-shaped housing and multi-lip seal to prevent belt slippage.
It effectively improves the tension of the tensioner pulley, prevents the belt from accidentally slipping off, reduces the risk of system damage, extends the service life of the system, and maintains stability under harsh working conditions.
Smart Images
Figure CN224064719U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile parts, and specifically relates to a timing tension pulley bearing preventing belt from falling off. BACKGROUND
[0002] The automobile tension pulley bearing is mainly used in the engine belt transmission system and is used for guiding and tensioning the transmission belt. In the engine, the belt transmission system is divided into a timing transmission system and an accessory transmission system. The timing belt plays a connecting and transmission role between the camshaft timing wheel and the crankshaft timing wheel of the engine, and the accessory belt plays a connecting and transmission role between the generator, water pump, air conditioner compressor and other automobile accessory systems, and both are important transmission parts in the automobile engine.
[0003] However, during the working process of the automobile engine, the four processes of intake, compression, explosion and exhaust continuously occur in the cylinder, so the engine crankshaft speed is nonlinear, and the belt connecting the crankshaft timing wheel and the camshaft timing wheel will also present periodic tight and loose fluctuations. In the normal driving of the vehicle, the stability of the belt transmission directly affects the stable driving of the vehicle, and the effective tensioning function and reliability of the timing tension pulley are the key factors determining the stability of the belt.
[0004] If the belt does not have sufficient tensioning force during the driving of the vehicle, the phenomenon of slipping will occur, which directly affects the function of the entire transmission system, and may cause damage to the vehicle, or even cause some irreparable accidents. If the belt suddenly deviates and falls off, it may cause the engine piston to suddenly lose power and top the cylinder, directly causing irreparable damage to the automobile engine and causing huge losses to the customers and vehicle owners. Most of the existing tension pulleys have small torque and small tensioning force, which are suitable for most vehicles, but for individual vehicle models, the engine running torque is large and the acceleration is fast. Using ordinary timing tension pulleys cannot well play the tensioning function, and the belt is prone to vibration, which affects the system stability and service life. SUMMARY
[0005] The utility model mainly solves the deficiency existing in the prior art, provides a timing tension pulley bearing preventing belt from falling off, and optimizes the tensioning force size and the cooperation outer shape structure of the belt of the tension pulley to improve the service performance and service life of the tension pulley product. The product can prevent the damage of the system caused by the accidental falling of the belt when providing greater tensioning force, reduce the damage of the system caused by the wear and deviation of the belt, avoid the destructive damage of the system caused by the accidental falling of the belt, and reserve sufficient reaction time for system maintenance and adjustment.
[0006] The above technical problems of the utility model are mainly solved through the following technical scheme:
[0007] A timing tensioner bearing for preventing belt slippage includes a positioning core, which serves as a support and positioning component for the bearing. The positioning core has an outer sleeve that engages with it. A tube is positioned between the outer sleeve and the positioning core. An eccentric sleeve is positioned between the tube and the outer sleeve, and the eccentric sleeve adjusts the tension through its eccentric design. A bearing is positioned between the eccentric sleeve and the outer sleeve. A cover plate, nested within the tube, is located at the front end of the eccentric sleeve. A spring is positioned between the cover plate and the eccentric sleeve, elastically engaging with both the eccentric sleeve and the cover plate.
[0008] Preferably, the bearing includes an inner ring, an outer ring that fits onto the inner ring, a plurality of cages between the outer ring and the inner ring, and a plurality of steel balls arranged in a ring and movably engaged with the cages.
[0009] Preferably, a multi-lip skeleton sealing ring is provided at both ends of the outer ring and between the inner ring.
[0010] Preferably, a gasket that fits between the rear end of the eccentric sleeve and the positioning core is provided to engage with the sleeve.
[0011] Preferably, a bushing is provided between the eccentric sleeve and the sleeve.
[0012] Preferably, the outer casing has a design with side guards on both sides, and the cross-section of the outer casing has an "H" shape.
[0013] Preferably, the spring is a rectangular spring with a rectangular cross-section. It is used to provide elastic force, compensate for dimensional changes caused by temperature variations or load fluctuations, and provide greater tension.
[0014] This invention can achieve the following effects:
[0015] This invention provides a timing tensioner bearing for preventing belt slippage. Compared with existing technologies, the torque spring of the tensioner is optimized to provide higher torque within the original space, thereby improving the product tension. This spring can be installed within the original spring space to provide greater torque. The original circular spring is replaced with a square spring with a larger cross-sectional area, resulting in nearly double the torque provided compared to a circular spring of the same diameter, thus better tensioning the belt.
[0016] Anti-loosening design: The elastic structure of the eccentric sleeve and spring ensures that the bearing will not loosen due to vibration or temperature changes during high-speed operation.
[0017] Sealing performance: Multi-lip seals and dustproof design prevent contaminants from entering the bearing and extend its service life.
[0018] Tension adjustment: The belt tension can be adjusted by the eccentric design of the eccentric sleeve and the elasticity of the spring to keep the belt stable.
[0019] Stability and Reliability: The H-shaped housing design enhances resistance to deformation, ensuring the bearing operates normally under harsh conditions.
[0020] Optimizing the shape of the tensioner pulley's outer diameter and the belt's mating position, and adding appropriately high retaining edges on both sides of the outer diameter, can effectively prevent the belt from slipping off due to sudden events or accidents, reduce damage to the engine, and thus improve the lifespan of the engine system. Attached Figure Description
[0021] Figure 1 This is a structural cross-sectional view of the present invention.
[0022] Figure 2 This is a cross-sectional view of the bearing in this utility model.
[0023] Figure 3 This is a schematic diagram of the spring in this utility model.
[0024] In the diagram: 1. Outer sleeve; 2. Bearing; 3. Eccentric sleeve; 4. Cover plate; 5. Spring; 6. Sleeve; 7. Positioning core; 8. Shaft sleeve; 9. Gasket; 10. Cage; 11. Outer ring; 12. Steel ball; 13. Inner ring; 14. Multi-lip skeleton seal ring. Detailed Implementation
[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0026] Example: Figure 1 , Figure 2 and Figure 3 As shown, a timing tensioner bearing for preventing belt slippage includes a positioning core 7. A housing sleeve 1, which is fitted onto the positioning core 7, has a design with side flanges on both sides and an "H"-shaped cross-section. A sleeve 6 is provided between the housing sleeve 1 and the positioning core 7. An eccentric sleeve 3 is provided between the sleeve 6 and the housing sleeve 1. A bearing 2 is provided between the eccentric sleeve 3 and the housing sleeve 1. The bearing 2 includes an inner ring 13, and an outer ring 11 fitted onto the inner ring 13. Multi-lip skeleton seals 14 are provided at both ends of the outer ring 11 and the inner ring 13. A pair of retainers 10 are provided between the outer ring 11 and the inner ring 13. Ten steel balls 12, arranged in a ring and movably engaged with the retainers 10, are provided on the retainers 10. The eccentric sleeve 3 has a cover plate 4 nested at its front end, which is nested with the sleeve 6. A spring 5, which is elastically connected to the eccentric sleeve 3 and the cover plate 4, is provided between the cover plate 4 and the eccentric sleeve 3. The spring 5 is a rectangular spring with a rectangular cross-section. A gasket 9, which is nested with the sleeve 6, is provided between the rear end of the eccentric sleeve 3 and the positioning core 7. A bushing 8 is provided between the eccentric sleeve 3 and the sleeve 6.
[0027] The bearing assembly clearance needs to be confirmed after pressure testing of the outer casing and eccentric sleeve to ensure that the finished clearance meets the requirements. The bearing and casing are interference fit, and the separation force between the casing and bearing after assembly should be ≥3000N. The eccentric sleeve and bearing are interference fit, and the separation force between the eccentric sleeve and bearing after assembly should be ≥2000N. The cover plate and sleeve are interference fit, and the separation force between the cover plate and sleeve after assembly should be ≥1000N. After installation, the locating core end face is riveted to prevent the product from loosening and falling apart; the separation force between the locating core and sleeve should be ≥200N.
[0028] The outer shell is machined, deburred, and phosphated, resulting in a smooth and flat surface that ensures reliable fit with the belt. The edge design effectively prevents the belt from accidentally slipping off.
[0029] The spring cross-section is rectangular, and the angle and wire diameter must be manufactured strictly according to the drawings to ensure the stable tension provided by the finished product.
[0030] To ensure the product's tensioning function, the spring's manufacturing angle and wire dimensions must be strictly controlled. To ensure the product's anti-belt slippage function, the assembly dimensions and release forces of each part during assembly, as well as the dimensions of the outer casing's edge, must be controlled to meet the design requirements of the drawings.
[0031] Regarding material selection, 65Mn square springs were chosen, and the outer shell was made of 45# steel. After machining to the design dimensions, the surface was phosphated. This achieved a balance between reducing costs and meeting usage requirements.
[0032] In summary, this anti-belt slippage timing tensioner bearing effectively solves the problems of poor sealing, limited tension adjustment, and weak anti-slippage performance in existing technologies. By optimizing the tensioner's tension and its external structure in conjunction with the belt, the performance and lifespan of the tensioner product are improved. It ensures that the product prevents damage to the system from accidental belt slippage when providing greater tension, reduces damage caused by belt wear, misalignment, and slippage, avoids destructive damage to the system due to accidental belt slippage, and allows sufficient reaction time for system maintenance and adjustment.
[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0034] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.
Claims
1. A belt slip prevention timing pulley bearing, characterized by: The positioning core (7) is provided with a shell sleeve (1) sleeved with the positioning core (7), the shell sleeve (1) and the positioning core (7) are provided with a sleeve pipe (6), the sleeve pipe (6) and the shell sleeve (1) are provided with an eccentric sleeve (3), the eccentric sleeve (3) and the shell sleeve (1) are provided with a bearing (2), the eccentric sleeve (3) is provided with a cover plate (4) nested with the sleeve pipe (6) at the front end, and the cover plate (4) and the eccentric sleeve (3) are provided with a spring (5) elastically sleeved with the eccentric sleeve (3) and the cover plate (4).
2. A belt slip prevention timing tension pulley bearing according to claim 1, characterized in that: The bearing (2) comprises an inner ring (13), the inner ring (13) is provided with an outer ring (11) sleeved with the inner ring (13), the outer ring (11) and the inner ring (13) are provided with a plurality of retainer rings (10), and the retainer rings (10) are provided with a plurality of steel balls (12) distributed in a ring shape and movably clamped with the retainer rings (10).
3. A belt slip prevention timing pulley bearing according to claim 2, characterized in that: The outer ring (11) is provided with a multi-lip skeleton sealing ring (14) at both ends of the inner ring (13).
4. A belt slip prevention timing pulley bearing according to claim 1, wherein: The eccentric sleeve (3) is provided with a gasket (9) sleeved with the sleeve pipe (6) between the rear end and the positioning core (7).
5. A belt slip prevention timing pulley bearing according to claim 1, wherein: The eccentric sleeve (3) and the sleeve pipe (6) are provided with a shaft sleeve (8).
6. A belt slip prevention timing pulley bearing according to claim 1, wherein: The shell sleeve (1) is designed with a flange on both sides, and the shell sleeve (1) has a cross section in the shape of "H".
7. A belt slip prevention timing pulley bearing according to claim 1, wherein: The spring (5) is a rectangular spring with a rectangular cross section.