Anti-falling limiting device for engine one-way belt pulley

Abstract

This invention relates to the field of pulley technology and provides an anti-disengagement limiting device for a one-way pulley in an engine. The device includes a pulley assembly and a one-way clutch assembly, wherein the one-way clutch assembly is disposed inside the pulley assembly. The pulley assembly includes a pulley body and two stepped rings. The one-way clutch assembly includes a spindle and a movable collar. The inner walls of the two stepped rings are symmetrically fixedly connected to the outer surface of the movable collar. The pulley body is movably connected to the outer surface of the movable collar. Disc springs are fixedly connected to opposite sides of the pulley body. This invention, through the disc springs, allows the pulley body to absorb energy through elastic deformation when subjected to axial impact loads, effectively buffering axial displacement, preventing direct transmission of impact to the one-way clutch assembly, reducing wear between the rollers and the grooves, and extending the device's service life.

Description

Technical Field

[0001] This invention relates to the field of belt pulley technology, and in particular to an anti-disengagement limiting device for a one-way belt pulley of an engine. Background Technology

[0002] When a car engine is running, the crankshaft output speed fluctuates periodically due to the reciprocating motion of the piston and the uneven work done by each cylinder. This speed fluctuation is transmitted to the alternator and other front-end accessories via the belt, causing the alternator pulley to continuously bear irregular alternating impact loads and severe vibrations. In order to isolate engine torsional vibration and reduce vibration and noise of accessory transmission systems, the overrunning alternator pulley (OAP) was developed. The OAP has a built-in one-way clutch, which allows the alternator rotor to rotate freely over the outer ring of the pulley by its own inertia when the engine decelerates or shifts gears. This decouples the inner and outer ring motions, effectively reducing belt wobble noise by 30%-50%, reducing vibration amplitude by about 40%, and significantly extending the service life of the belt and pulley system components.

[0003] In existing technologies, the widely adopted integrated one-way clutch combined with needle roller bearings has a structure where the needle roller bearings have almost no ability to withstand axial loads. Under actual operating conditions, the belt tension fluctuates repeatedly with the engine speed, causing the outer ring of the pulley to shift axially periodically. Due to the lack of a reliable limiting structure or insufficient limiting rigidity, this shift will directly cause axial movement of the internal components of the pulley, resulting in inconsistent axial contact lengths when the one-way clutch transmits torque. This leads to reduced torque transmission efficiency and uneven force distribution. At the same time, frequent axial movement exacerbates the abnormal wear of the one-way clutch and related support bearings, shortening the service life of the entire one-way pulley. Summary of the Invention

[0004] The purpose of this invention is to address the problem in the existing technology where a widely used integrated one-way clutch is coupled with a needle roller bearing. Needle roller bearings have virtually no capacity to withstand axial loads. Under actual operating conditions, the belt tension fluctuates repeatedly with the engine speed, causing the outer ring of the pulley to periodically shift axially. Due to the lack of a reliable limiting structure or insufficient limiting rigidity, this shift directly leads to axial movement of the internal components of the pulley, resulting in inconsistent axial contact lengths when the one-way clutch transmits torque. This leads to reduced torque transmission efficiency and uneven stress. Furthermore, frequent axial movement exacerbates abnormal wear of the one-way clutch and related support bearings, shortening the overall service life of the one-way pulley.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an anti-disengagement limiting device for a one-way pulley of an engine, comprising: a pulley assembly and a one-way clutch assembly, wherein the one-way clutch assembly is disposed inside the pulley assembly, the pulley assembly includes a pulley body and two stepped rings, the one-way clutch assembly includes a spindle and a movable collar, the inner walls of the two stepped rings are symmetrically fixedly connected to the outer surface of the movable collar, the pulley body is movably connected to the outer surface of the movable collar, and disc springs are fixedly connected to opposite sides of the pulley body, one end of each of the two disc springs is respectively fixedly connected to one side of the inner wall of the two stepped rings.

[0006] Preferably, a second staggered ring is fixedly connected to each opposite side of the pulley body, a first staggered ring is fixedly connected to one side of the stepped ring, the outer surface of the first staggered ring is movably sleeved on the outer surface of the second staggered ring, the inner diameter of the first staggered ring is equal to the outer diameter of the second staggered ring, and the disc spring is located between the second staggered ring and the movable collar.

[0007] Preferably, the outer surface of the second staggered ring is fixedly connected with multiple guide strips in a circumferential array, and the inner wall of the first staggered ring is provided with multiple guide grooves in a circumferential array, with the outer surface of the guide strips slidably connected to the inside of the guide grooves.

[0008] Preferably, a buffer member is fixedly connected to the inner wall of the stepped ring, and the outer surface of the buffer member is fixedly connected to one side of the staggered ring two.

[0009] Preferably, a fixed collar is fixedly connected to the outer surface of the mandrel, and the outer surface of the fixed collar is rotatably connected to the inner wall of the movable collar.

[0010] Preferably, two needle roller bearings are symmetrically fixedly connected to the outer surface of the fixed collar, and the outer surfaces of the two needle roller bearings are symmetrically rotatably connected to the inside of the movable collar.

[0011] Preferably, the outer surface of the fixing collar is provided with a plurality of rectangular grooves in a circumferential array, and rollers are movably connected inside the rectangular grooves. The outer surface of the mandrel is provided with a plurality of oblique grooves in a circumferential array, and the outer surface of the rollers is movably connected inside the oblique grooves.

[0012] Preferably, a spring sheet is fixedly connected to the inner wall of the rectangular groove by a bracket, and the spring sheet is configured in an arc shape.

[0013] Preferably, one side of the fixing collar has multiple threaded holes arranged in a circumferential array, one end of the mandrel is provided with a protective cover, and one side of the protective cover is movably connected with multiple bolts arranged in a circumferential array, with one end of the bolts threaded into the inside of the threaded holes.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention, through the design of a disc spring, allows the disc spring to elastically deform and absorb energy when the pulley body is subjected to axial impact load, effectively buffering axial displacement, preventing the impact from being directly transmitted to the one-way clutch assembly, reducing wear on the rollers and inclined grooves, and extending the service life of the device.

[0015] This invention, through the sliding engagement of the guide groove on the first interlaced ring and the guide strip on the second interlaced ring, ensures that the pulley body stably transmits rotational torque to the stepped ring while allowing the two to move axially relative to each other, adapting to the buffer deformation of the disc spring, preventing interruption of torque transmission, and improving operational stability.

[0016] This invention utilizes a buffer element, made of elastic rubber or a buffer airbag, between the stepped ring and the staggered ring. This element further absorbs residual vibration energy, enhances the buffering effect, and simultaneously seals the connection gap, providing an auxiliary sealing function to prevent external contaminants from entering, protecting the needle roller bearing and the one-way clutch from entering, and extending the maintenance cycle. Attached Figure Description

[0017] Figure 1 This invention provides a partial cross-sectional structural diagram of an anti-detachment limiting device for a one-way pulley of an engine. Figure 2 This invention provides an anti-detachment limiting device for a one-way pulley of an engine. Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the left side of an anti-detachment limiting device for a one-way pulley of an engine, provided by the present invention. Figure 4 This is a schematic diagram of the right side of an anti-detachment limiting device for a one-way pulley of an engine, provided by the present invention. Figure 5 An exploded structural diagram of an anti-disengagement limiting device for a one-way pulley of an engine, provided by the present invention; Figure 6 This invention provides a schematic diagram of a partially axially disassembled structure of an anti-detachment limiting device for a one-way pulley of an engine. Figure 7 A schematic diagram of a partially radially split structure of an anti-detachment limiting device for a one-way pulley of an engine provided by the present invention; Figure 8 This is a radial cross-sectional view of an anti-detachment limiting device for a one-way pulley of an engine, provided by the present invention.

[0018] Legend: 1. Pulley body; 101. Stepped ring; 102. Interlaced ring one; 103. Interlaced ring two; 104. Guide bar; 105. Guide groove; 106. Disc spring; 2. Protective cover; 201. Bolt; 3. Mandrel; 301. Fixed collar; 302. Threaded hole; 303. Needle roller bearing; 304. Movable collar; 305. Rectangular groove; 306. Roller; 307. Spring plate; 308. Inclined groove; 4. Buffer component. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Examples, such as Figure 1 - Figure 8 As shown, the present invention provides an anti-disengagement limiting device for a one-way pulley of an engine, comprising: a pulley assembly and a one-way clutch assembly. The one-way clutch assembly is disposed inside the pulley assembly. The pulley assembly includes a pulley body 1 and two stepped rings 101. The one-way clutch assembly includes a spindle 3 and a movable collar 304. The inner walls of the two stepped rings 101 are symmetrically fixedly connected to the outer surface of the movable collar 304. The pulley body 1 is movably connected to the outer surface of the movable collar 304. Disc springs 106 are fixedly connected to opposite sides of the pulley body 1. One end of each disc spring 106 is fixedly connected to one side of the inner wall of the two stepped rings 101.

[0021] Furthermore, such as Figure 1 - Figure 8 As shown, a second staggered ring 103 is fixedly connected to both opposite sides of the pulley body 1, and a first staggered ring 102 is fixedly connected to one side of the stepped ring 101. The outer surface of the first staggered ring 102 is movably sleeved on the outer surface of the second staggered ring 103. The inner diameter of the first staggered ring 102 is equal to the outer diameter of the second staggered ring 103. The disc spring 106 is located between the second staggered ring 103 and the movable collar 304. By setting the sleeve structure of the first staggered ring 102 and the second staggered ring 103, a smooth guide can be provided for the axial relative movement between the pulley body 1 and the stepped ring 101. At the same time, it cooperates with the disc spring 106 to form a reliable axial buffer and limiting unit.

[0022] Furthermore, such as Figure 1 - Figure 8As shown, the outer surface of the staggered ring 103 is fixedly connected with multiple guide strips 104 in a circumferential array, and the inner wall of the staggered ring 102 is provided with multiple guide grooves 105 in a circumferential array. The outer surface of the guide strips 104 is slidably connected to the inside of the guide grooves 105. Through the sliding cooperation between the guide strips 104 and the guide grooves 105, the rotational torque of the pulley body 1 can be stably transmitted to the stepped ring 101, and the direction of axial buffer displacement can be precisely guided to prevent circumferential misalignment and ensure that the power transmission and buffering action do not interfere with each other.

[0023] Furthermore, such as Figure 1 - Figure 8 As shown, a buffer 4 is fixedly connected to the inner wall of the stepped ring 101. The outer surface of the buffer 4 is fixedly connected to one side of the interlaced ring 103. The buffer 4 can be made of elastic materials such as elastic rubber or buffer airbags. It further absorbs residual axial vibration on the basis of the disc spring 106 buffer, and fills the gap between the stepped ring 101 and the interlaced ring 103 to play an auxiliary sealing role and prevent external dust and mud from entering the interior.

[0024] Furthermore, such as Figure 1 - Figure 8 As shown, a fixed collar 301 is fixedly connected to the outer surface of the spindle 3. The outer surface of the fixed collar 301 is rotatably connected to the inner wall of the movable collar 304. Two needle roller bearings 303 are symmetrically fixedly connected to the outer surface of the fixed collar 301. The outer surfaces of the two needle roller bearings 303 are symmetrically rotatably connected to the inside of the movable collar 304. Through the symmetrical support of the two needle roller bearings 303, a high-precision, low-friction relative rotation between the movable collar 304 and the fixed collar 301 can be achieved, providing precise radial positioning for the stable operation of the one-way clutch.

[0025] Furthermore, such as Figure 1 - Figure 8 As shown, the outer surface of the fixed collar 301 has multiple rectangular grooves 305 arranged in a circumferential array. Rollers 306 are movably connected inside the rectangular grooves 305. The outer surface of the spindle 3 has multiple oblique grooves 308 arranged in a circumferential array. The outer surface of the rollers 306 is movably connected inside the oblique grooves 308. The inner wall of the rectangular grooves 305 is fixedly connected to a spring plate 307 by a bracket. The spring plate 307 is set in an arc shape. When the movable collar 304 rotates in the locking direction, the rollers 306 wedge into the shallower side of the oblique groove 308 under the action of the thrust and friction of the spring plate 307, locking the movable collar 304 and the fixed collar 301 together to transmit torque. When the movable collar 304 moves relative to the fixed collar in the overrunning direction, the rollers 306 overcome the thrust of the spring plate 307 and roll towards the deeper side of the oblique groove 308, releasing the lock and allowing the inner and outer rings to freely overrun and rotate, realizing the unidirectional transmission function.

[0026] Furthermore, such as Figure 1 - Figure 8 As shown, a plurality of threaded holes 302 are arranged in a circumferential array on one side of the fixed collar 301. A protective cover 2 is provided at one end of the spindle 3. A plurality of bolts 201 are movably connected in a circumferential array on one side of the protective cover 2. One end of the bolts 201 is threaded into the inside of the threaded holes 302. By fixing the protective cover 2 and the bolts 201, the internal rollers 306, spring plates 307 and other parts can be sealed and protected to prevent grease leakage and the entry of external foreign objects, thus ensuring the long-term reliable operation of the one-way clutch.

[0027] Working principle: The engine crankshaft drives the pulley body 1 to rotate via a transmission belt. The pulley body 1, relying on the sliding engagement between the guide bar 104 on the second interlaced ring 103 and the guide groove 105 on the first interlaced ring 102, transmits the rotational torque to the stepped ring 101, which in turn drives the movable collar 304, which is fixedly connected to the stepped ring 101, to rotate synchronously. During this process, the engagement between the guide bar 104 and the guide groove 105 ensures stable torque transmission and provides precise guidance for the axial buffer displacement of the pulley body 1, preventing interruption of torque transmission and improving the system's operational stability. When the movable collar 304 rotates in the locking direction, the friction of its inner wall against the rectangular groove... The combined action of the inner arc-shaped spring plate 307 pushes the roller 306 into the shallower area of ​​the inclined groove 308, locking the movable collar 304 and the fixed collar 301 together. This, in turn, drives the spindle 3 and the generator rotor to rotate via the fixed collar 301, generating electricity. When the engine decelerates or shifts gears, causing a sudden drop in the speed of the pulley body 1 and the movable collar 304, the generator rotor, due to inertia, tends to maintain high-speed rotation. At this time, the speed of the spindle 3 and the fixed collar 301 is higher than that of the movable collar 304. The roller 306 is drawn into the deeper side of the inclined groove 308, compressing the spring plate 307 and disengaging it from the locked position, thus locking the movable collar 304 and the fixed collar 301 together. The separation between the 01 and 1 allows the generator rotor to rotate freely due to inertia, thus isolating the engine from torsional vibration impact. During operation, if belt tension fluctuations or other factors cause the pulley body 1 to be subjected to axial impact force, the pulley body 1 can compress the disc spring 106 through the interlaced ring 2 103, causing the disc spring 106 to elastically deform and absorb the impact energy, effectively buffering axial displacement and preventing the impact force from directly acting on the precision mating surfaces such as the rollers 306 and the inclined grooves 308 of the one-way clutch assembly, significantly reducing wear and extending service life. At the same time, the buffer 4 installed between the stepped ring 101 and the interlaced ring 2 103 can further absorb residual shaft impact. The device reduces vibration, enhances overall buffering effect, and seals connection gaps, providing auxiliary sealing to prevent external dust and mud from entering the internal needle roller bearing 303 and one-way clutch, thus protecting the lubrication environment. Under the synergistic effect of the above structures, this device not only ensures efficient transmission of rotational torque and one-way overrunning function, but also effectively solves the problems of internal component movement, increased wear, and reduced torque transmission efficiency caused by the lack of reliable axial limiting through the anti-disengagement limiting system composed of disc spring 106, guide bar 104, guide groove 105, and buffer 4. This significantly improves the working reliability and service life of the engine one-way pulley under alternating loads and high vibration conditions.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A one-way pulley anti-disengagement limiting device for an engine, characterized in that, include: A pulley assembly and a one-way clutch assembly are provided. The one-way clutch assembly is disposed inside the pulley assembly. The pulley assembly includes a pulley body (1) and two stepped rings (101). The one-way clutch assembly includes a spindle (3) and a movable collar (304). The inner walls of the two stepped rings (101) are symmetrically fixedly connected to the outer surface of the movable collar (304). The pulley body (1) is movably connected to the outer surface of the movable collar (304). Disc springs (106) are fixedly connected to opposite sides of the pulley body (1). One end of each disc spring (106) is fixedly connected to one side of the inner wall of the two stepped rings (101).

2. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 1, characterized in that: The pulley body (1) is fixedly connected to the opposite side of the two interlocking rings (103), and the stepped ring (101) is fixedly connected to one side of the interlocking ring (102). The outer surface of the interlocking ring (102) is movably sleeved on the outer surface of the interlocking ring (103). The inner diameter of the interlocking ring (102) is equal to the outer diameter of the interlocking ring (103). The disc spring (106) is located between the interlocking ring (103) and the movable collar (304).

3. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 2, characterized in that: The outer surface of the second interlaced ring (103) is fixedly connected with multiple guide strips (104) in a circumferential array. The inner wall of the first interlaced ring (102) is provided with multiple guide grooves (105) in a circumferential array. The outer surface of the guide strips (104) is slidably connected to the inside of the guide grooves (105).

4. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 3, characterized in that: The inner wall of the stepped ring (101) is fixedly connected to a buffer (4), and the outer surface of the buffer (4) is fixedly connected to one side of the staggered ring (103).

5. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 1, characterized in that: The outer surface of the mandrel (3) is fixedly connected to a fixed collar (301), and the outer surface of the fixed collar (301) is rotatably connected to the inner wall of the movable collar (304).

6. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 5, characterized in that: Two needle roller bearings (303) are symmetrically fixedly connected to the outer surface of the fixed collar (301), and the outer surfaces of the two needle roller bearings (303) are symmetrically rotatably connected to the inside of the movable collar (304).

7. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 6, characterized in that: The outer surface of the fixed collar (301) is provided with a plurality of rectangular grooves (305) arranged in a circumferential array. Rollers (306) are movably connected inside the rectangular grooves (305). The outer surface of the mandrel (3) is provided with a plurality of oblique grooves (308) arranged in a circumferential array. The outer surface of the rollers (306) is movably connected inside the oblique grooves (308).

8. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 7, characterized in that: The inner wall of the rectangular groove (305) is fixedly connected to a spring sheet (307) by a bracket, and the spring sheet (307) is set in an arc shape.

9. The anti-disengagement limiting device for a one-way pulley of an engine according to claim 5, characterized in that: The fixed collar (301) has multiple threaded holes (302) arranged in a circumferential array on one side. The mandrel (3) has a protective cover (2) at one end. Multiple bolts (201) are movably connected in a circumferential array on one side of the protective cover (2). One end of the bolt (201) is threaded into the inside of the threaded hole (302).

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