Automotive seat belt retractor with silent guide wheel

Abstract

The utility model belongs to the technical field of automobile parts, especially automobile safety belt retractor with mute type guide wheel, the surface of retractor main part is equipped with three groups of guide wheel group for safety belt guide, the guide wheel group includes the wheel frame of retractor main part side setting, be provided with the angular bearing between the wheel frame and retractor main part, install the mute guide wheel in the wheel frame, the both ends of wheel frame are equipped with side wheel, make safety belt in the car pull through three groups of guide wheel group and guide, thereby avoid the noise that safety belt produces because of the friction of cable-stayed and retractor, simultaneously three groups of guide wheel group make every group of angle of regulation gradually reduce, and the guide wheel group is composed of wheel frame, angular bearing, mute guide wheel and side wheel, when mute guide wheel guides safety belt, mute guide wheel takes wheel frame and rotates on the surface of retractor main part around angular bearing, thereby realize the purpose that three groups of guide wheel group guide safety belt.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a car seat belt retractor with a silent guide wheel. Background Technology

[0002] As a core component of a vehicle's passive safety system, the seatbelt retractor's main function is to allow for flexible extension and retraction of the seatbelt during normal vehicle operation. In emergency situations such as sudden braking, collisions, or tilting, its internal locking mechanism quickly locks the seatbelt, securely restraining occupants in their seats and effectively reducing the risk of injury or death. Therefore, its performance stability and user experience directly affect the safety and comfort of passengers. With the continuous development of the automotive industry, consumers' demands for the driving experience have gradually upgraded from basic safety guarantees, with a significant increase in attention paid to in-vehicle NVH (noise, vibration, and harshness) performance. The noise generated by the seatbelt retractor during the seatbelt's pulling and rewinding process has become a significant factor affecting the quietness of the vehicle interior.

[0003] Traditional car seat belt retractors typically have only a single guide structure, or although they have guide wheels, the structure is simple in design. In actual use, due to differences in the operating habits of drivers and passengers and the limitations of the interior space layout of the vehicle, the seat belt often experiences situations such as diagonal or biased pulling. This causes severe friction between the seat belt and the edge of the retractor body and the guide structure, which not only easily causes wear on the surface of the seat belt and shortens its service life, but also generates obvious friction noise.

[0004] Further analysis reveals that traditional guide wheel structures are mostly designed with a fixed angle, unable to adaptively adjust their angle according to the direction of seat belt pull. When the seat belt pull angle changes significantly, the contact pattern between the guide wheel and the seat belt changes abruptly, easily causing vibration of the guide wheel. This vibration not only transmits to the retractor body, creating structural sound, but also resonates with the air, further exacerbating the noise problem. Furthermore, some guide wheels lack effective side restraint structures, making them prone to detachment during seat belt pull. This not only leads to guide failure, but the impact and friction at the moment of detachment also generate sudden noise, severely impacting the driving and riding experience.

[0005] While some existing technologies attempt to mitigate the aforementioned noise and guidance issues by optimizing the guide wheel material or increasing lubrication, the noise reduction effect of material optimization is limited, and material wear after long-term use can lead to noise rebound. Lubrication methods, on the other hand, pose risks such as grease aging and seatbelt contamination, failing to fundamentally address the core issues of adaptive guidance angle and vibration absorption. Therefore, designing an automotive seatbelt retractor capable of stable seatbelt guidance, adaptive adjustment of the traction angle, effective limitation of seatbelt deviation, and absorption of vibration noise has become a pressing technical need for those skilled in the art. Utility Model Content

[0006] This utility model addresses the shortcomings of existing technologies by providing a car seatbelt retractor with a silent guide wheel. The specific technical solution is as follows:

[0007] A car seat belt retractor with silent guide wheels includes a retractor body and a seat belt wound around a retractor body. Three sets of guide wheels for guiding the seat belt are mounted on the surface of the retractor body.

[0008] The guide wheel assembly includes a wheel frame disposed on the side of the retractor body, an angle-adjusting bearing disposed between the wheel frame and the retractor body, a silent guide wheel installed inside the wheel frame, and side wheels installed at both ends of the wheel frame;

[0009] The sides of the main body of the retractor are bonded with sound-absorbing cotton boards for absorbing vibration and noise.

[0010] Preferably, there are two side wheels, and the two side wheels are vertically arranged at both ends of the silent guide wheel.

[0011] Preferably, the silent guide wheel includes a wheel body and a rubber sleeve bonded to the outer surface of the wheel body. A shaft is provided at both ends of the wheel body. A silent bearing is installed between the wheel body and the shaft. The outer ring of the silent bearing is fixed in a hole opened at the end of the wheel body. The inner ring of the silent bearing is fixed to the outer surface of the shaft. An elastic retaining ring for blocking the outer ring of the silent bearing is installed in the hole opened at the end of the wheel body. A noise reduction component for noise reduction of the silent bearing is also provided between the wheel body and the shaft.

[0012] Preferably, the noise reduction component includes a first cotton ring bonded to the inner surface of a hole at the end of the wheel body, and a second cotton ring bonded to the outer surface of the shaft, wherein the first cotton ring and the second cotton ring are staggered.

[0013] Preferably, the surface of the sound-absorbing cotton board is provided with a plurality of sound-absorbing grooves, and the sound-absorbing grooves are of a zigzag structure.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Three sets of guide wheels mounted on the surface of the retractor body guide the seat belt when it is pulled inside the car, thus avoiding noise caused by friction between the seat belt and the retractor due to oblique pulling. The three sets of guide wheels allow for progressively lower adjustment angles. Each guide wheel set consists of a wheel frame, an adjustment bearing, a silent guide wheel, and side wheels. When the silent guide wheel guides the seat belt, it rotates around the adjustment bearing on the surface of the retractor body, thus achieving the purpose of guiding the seat belt with the three sets of guide wheels. The side wheels mounted at both ends of the wheel frame are used for lateral restraint of the seat belt to prevent it from detaching during guidance. Sound-absorbing cotton panels bonded to the sides of the retractor body absorb vibration and noise when the guide wheels guide the seat belt, achieving noise reduction.

[0016] 2. A silent guide wheel is constructed by means of a wheel body, a rubber sleeve, a shaft, a silent bearing, an elastic retaining ring, a first cotton ring, and a second cotton ring. The shaft is installed in a hole at the end of the wheel body through the silent bearing. The silent bearing is limited by the elastic retaining ring. The noise reduction component composed of the first and second cotton rings is used to reduce noise when the silent bearing rotates, thereby reducing the noise of the guide wheel assembly guiding the seat belt. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the silent guide wheel structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the sound-absorbing cotton board structure in this utility model;

[0021] Figure 5 This is a schematic diagram of a half-section of the sound-absorbing cotton board in this utility model.

[0022] Reference numerals: 1. Retractor body; 2. Safety belt; 3. Guide wheel assembly; 31. Wheel frame; 32. Adjustable bearing; 33. Silent guide wheel; 331. Wheel body; 332. Rubber sleeve; 333. Shaft; 334. Silent bearing; 335. Elastic retaining ring; 336. First cotton ring; 337. Second cotton ring; 34. Side wheel; 4. Sound-absorbing cotton board; 41. Sound-absorbing groove. Detailed Implementation

[0023] The technical solution of this utility model will now be described with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1-5This embodiment provides the following technical solution: a car seat belt retractor with silent guide wheels, including a retractor body 1 and a seat belt 2 wound around a retractor body 1 on a retractor shaft. Three sets of guide wheel sets 3 for guiding the seat belt 2 are installed on the surface of the retractor body 1.

[0025] The guide wheel assembly 3 includes a wheel frame 31 arranged on the side of the retractor body 1, an angle-adjusting bearing 32 arranged between the wheel frame 31 and the retractor body 1, a silent guide wheel 33 installed inside the wheel frame 31, and side wheels 34 installed at both ends of the wheel frame 31.

[0026] The main body 1 of the retractor has a sound-absorbing cotton board 4 bonded to its side for absorbing vibration and noise.

[0027] In this embodiment, three sets of guide wheels 3 are installed on the surface of the retractor body 1, so that the seat belt 2 is guided by the three sets of guide wheels 3 when pulled in the car, thereby avoiding noise caused by friction between the seat belt 2 and the retractor due to oblique pulling. At the same time, the three sets of guide wheels 3 allow the adjustment angle of each set to gradually decrease. The guide wheel set 3 is composed of a wheel frame 31, an angle adjustment bearing 32, a silent guide wheel 33, and a side wheel 34. When the silent guide wheel 33 guides the seat belt 2, the silent guide wheel 33 carries the wheel frame 31 to rotate around the angle adjustment bearing 32 on the surface of the retractor body 1, thereby achieving the purpose of guiding the seat belt 2 by the three sets of guide wheels 3. The side wheels 34 installed at both ends of the wheel frame 31 are used to limit the side of the seat belt 2 to prevent the seat belt 2 from detaching during guidance. The sound-absorbing cotton board 4 bonded to the side of the retractor body 1 is used to absorb vibration and noise when the guide wheels 3 guide the seat belt 2, thereby achieving the purpose of noise reduction.

[0028] Specifically, there are two side wheels 34, which are vertically arranged at both ends of the silent guide wheel 33. The silent guide wheel 33 includes a wheel body 331 and a rubber sleeve 332 bonded to the outer surface of the wheel body 331. A shaft 333 is provided at both ends of the wheel body 331. A silent bearing 334 is installed between the wheel body 331 and the shaft 333. The outer ring of the silent bearing 334 is fixed in a hole at the end of the wheel body 331, and the inner ring of the silent bearing 334 is fixed to the outer surface of the shaft 333. An elastic retaining ring 335 for blocking the outer ring of the silent bearing 334 is installed in the hole at the end of the wheel body 331. A noise reduction component for noise reduction of the silent bearing 334 is also provided between the wheel body 331 and the shaft 333. The noise reduction component includes a first cotton ring 336 bonded to the inner surface of the hole at the end of the wheel body 331 and a second cotton ring 337 bonded to the outer surface of the shaft 333. The first cotton ring 336 and the second cotton ring 337 are staggered.

[0029] In this embodiment, a silent guide wheel 33 is constructed by a wheel body 331, a rubber sleeve 332, a shaft 333, a silent bearing 334, an elastic retaining ring 335, a first cotton ring 336, and a second cotton ring 337. The shaft 333 is installed in a hole at the end of the wheel body 331 through the silent bearing 334. At the same time, the silent bearing 334 is limited by the elastic retaining ring 335. The noise reduction component composed of the first cotton ring 336 and the second cotton ring 337 is used to reduce noise when the silent bearing 334 rotates, thereby reducing the noise when the guide wheel assembly 3 guides the seat belt 2.

[0030] Specifically, the surface of the sound-absorbing cotton board 4 is provided with several sound-absorbing grooves 41, and the sound-absorbing grooves 41 have a zigzag structure.

[0031] How to use:

[0032] Initial state preparation

[0033] The retractor body 1 is pre-installed in the designated position on the vehicle using bolts or other fixing structures to ensure a secure and stable installation. At this time, the seatbelt 2 is naturally wound around the reel of the retractor body 1. The silent guide wheel 33 and side wheel 34 in the guide wheel assembly 3 are in their initial stationary positions, the angle-adjusting bearing 32 remains stable, and the sound-absorbing cotton board 4 is tightly fitted against the side of the retractor body 1, ready for operation. After installation, it is necessary to check whether the seatbelt 2 passes through the guide area of ​​the three guide wheel assemblies 3 without twisting, and whether the side wheel 34 effectively limits the side movement of the seatbelt 2 to prevent the seatbelt 2 from shifting or jamming in its initial state.

[0034] Seatbelt pull-out operation

[0035] After the occupants are seated, they grasp the latch end of the seatbelt 2 and pull it gently away from the retractor. During the pulling process, the seatbelt 2 drives the retractor body 1 to rotate, and at the same time, the seatbelt 2 moves along the guide path of the guide wheel assembly 3.

[0036] Guiding adjustment: Since the three sets of guide wheels 3 are arranged in sequence along the pull-out direction of the seat belt 2, when the pulling angle of the seat belt 2 changes, the silent guide wheel 33 is subjected to the lateral force of the seat belt 2. Through the angle adjustment bearing 32 between the wheel frame 31 and the retractor body 1, the wheel frame 31 is driven to rotate as a whole, so that the silent guide wheel 33 always matches the pulling direction of the seat belt 2, ensuring smooth guidance;

[0037] Noise reduction and limiting: The rubber sleeve 332 on the outer surface of the silent guide wheel 33 directly contacts the seat belt 2, reducing the noise generated by hard friction. At the same time, the silent bearing 334 between the wheel body 331 and the shaft 333, together with the first cotton ring 336 and the second cotton ring 337, forms a noise reduction component to reduce the bearing noise during the rotation of the wheel body. The side wheels 34 vertically arranged at both ends of the wheel frame 31 limit the two sides of the seat belt 2 to prevent the seat belt 2 from leaving the guide area of ​​the silent guide wheel 33 during the pulling process, and avoid the additional noise generated by offset friction.

[0038] Noise absorption: The slight vibrations and residual noise generated during the pulling process are efficiently absorbed by the sound-absorbing cotton plate 4 on the side of the retractor body 1 through the sound-absorbing groove 41 with the folded structure on the surface, further improving the quietness effect.

[0039] After pulling the seat belt 2 to the appropriate length, insert the latch into the corresponding buckle on the car seat to complete the wearing and fixing of the seat belt. At this time, the seat belt 2 is kept under moderate tension by the spring mechanism inside the retractor.

[0040] Stability guidance during seat belt use

[0041] During vehicle operation, when the occupants experience slight body swaying, seatbelt 2 will extend and contract slightly accordingly:

[0042] The angle-adjusting bearing 32 in the guide wheel assembly 3 can adjust the angle of the wheel frame 31 in real time, so that the silent guide wheel 33 is always consistent with the force direction of the seat belt 2, avoiding noise and wear caused by hard contact;

[0043] The rubber sleeve 332 of the silent guide wheel 33 has a certain elasticity, which can buffer the impact force between the seat belt 2 and the wheel body. Combined with the smooth rotation of the silent bearing 334, it ensures that the small movement of the seat belt 2 is stable and noiseless.

[0044] The sound-absorbing cotton panel 4 continues to function, absorbing the vibration noise generated by the main body of the retractor 1 and the guide wheel assembly 3 during dynamic processes, maintaining a quiet environment inside the vehicle.

[0045] When the vehicle encounters emergencies such as emergency braking or collision, the locking mechanism inside the retractor body 1 is quickly activated, locking the reel to stop it from rotating, and the seat belt 2 is no longer pulled out. The stable support of the guide wheel group 3 effectively restrains the driver and passengers, ensuring personal safety.

[0046] Seatbelt rewinding operation

[0047] When passengers need to unbuckle their seatbelts, they should press the unlock button on the seat buckle to disengage the latch from the buckle.

[0048] The rewinding spring mechanism inside the main body 1 releases elastic potential energy, causing the rewind shaft to rotate in the opposite direction and begin to retract the seat belt 2;

[0049] Under the action of the rewinding force, the seat belt 2 moves in the opposite direction along the guide path of the guide wheel group 3. The silent guide wheel 33 rotates smoothly under the drive of the seat belt 2. The angle adjustment bearing 32 adjusts the angle of the wheel frame 31 to the initial position. The side wheel 34 continues to play a limiting role to prevent the seat belt 2 from getting tangled or deviating during the rewinding process.

[0050] The noise generated during the rewinding process is absorbed by the structural design of the silent guide wheel 33 and the sound-absorbing cotton board 4, achieving low-noise rewinding until the safety belt 2 is completely wound on the roller and returns to the initial static state.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A car seat belt retractor with a silent guide wheel, comprising a retractor body (1) and a seat belt (2) wound around a retractor body (1) on a reel, characterized in that: The surface of the retractor body (1) is equipped with three sets of guide wheels (3) for guiding the seat belt (2); The guide wheel assembly (3) includes a wheel frame (31) provided on the side of the retractor body (1), an angle adjustment bearing (32) is provided between the wheel frame (31) and the retractor body (1), a silent guide wheel (33) is installed inside the wheel frame (31), and side wheels (34) are installed at both ends of the wheel frame (31). The main body (1) of the retractor is bonded with a sound-absorbing cotton board (4) for absorbing vibration and noise.

2. The automotive seatbelt retractor with a silent guide wheel according to claim 1, characterized in that: Two side wheels (34) are provided, and the two side wheels (34) are vertically arranged at both ends of the silent guide wheel (33).

3. The automotive seatbelt retractor with a silent guide wheel according to claim 2, characterized in that: The silent guide wheel (33) includes a wheel body (331) and a rubber sleeve (332) bonded to the outer surface of the wheel body (331). Both ends of the wheel body (331) are provided with shafts (333). A silent bearing (334) is installed between the wheel body (331) and the shafts (333). The outer ring of the silent bearing (334) is fixed in a hole opened at the end of the wheel body (331). The inner ring of the silent bearing (334) is fixed on the outer surface of the shafts (333). An elastic retaining ring (335) for blocking the outer ring of the silent bearing (334) is installed in the hole opened at the end of the wheel body (331). A noise reduction component for noise reduction of the silent bearing (334) is also provided between the wheel body (331) and the shafts (333).

4. The automotive seatbelt retractor with a silent guide wheel according to claim 3, characterized in that: The noise reduction component includes a first cotton ring (336) bonded to the inner surface of a hole at the end of the wheel body (331), and a second cotton ring (337) bonded to the outer surface of the shaft (333), with the first cotton ring (336) and the second cotton ring (337) being misaligned.

5. The automotive seatbelt retractor with a silent guide wheel according to claim 1, characterized in that: The surface of the sound-absorbing cotton board (4) is provided with a number of sound-absorbing grooves (41), and the sound-absorbing grooves (41) are of a zigzag structure.

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