Waistband pretensioner assembly

Abstract

The utility model discloses a belt pre-tightener assembly, which belongs to the technical field of belt pre-tighteners and comprises a support mounted on an automobile, a winding drum for winding and unwinding a belt is rotatably connected onto the support, a driving wheel is coaxially connected onto the winding drum, a rotor is sleeved outside the driving wheel in a clamping manner, and the driving wheel and the rotor rotate synchronously. A guide support sleeved outside the rotor is installed on the support, a ball channel is installed outside the guide support in a sleeved mode, an outlet for balls to roll out is formed in the ball channel, and the ball channel is in through connection with the guide support through the outlet; a guide block is embedded in the ball channel, one end, close to the outlet, of the guide block is inclined, a limiting mechanism for limiting the position of the guide block is arranged in the ball channel, and the limiting mechanism keeps that the guide block is sealed at the outlet in the ball channel; the balls in the ball channel in the pre-tightener can keep a smooth state when rolling in the balls, so that the pre-tightener can quickly respond to tighten the waistband.

Description

Technical Field

[0001] This utility model relates to the field of belt pretensioner technology, specifically a belt pretensioner assembly. Background Technology

[0002] The lap belt pretensioner assembly is an important component of modern automotive safety systems. In the event of a collision, it tightens the seat belt to hold passengers firmly in their seats, reducing impact injuries caused by inertia. For example, in a frontal collision, the pretensioner will quickly activate, tightening the seat belt to keep passengers pressed against their seats, and working in conjunction with the deployment of the airbag to provide further protection.

[0003] For example, patent CN111605511B discloses a seatbelt pretensioner retractor assembly for a vehicle, comprising: a housing adapted to be mounted to a vehicle frame and having an internal cavity; a pretensioner tube having an arcuate and curved shape; a sprocket rotatably mounted to the housing and securely connected to a main shaft; a rod disposed within the tube; and a guide plate having a guide portion and a rod guide; the rod extends from the tube along the periphery of the sprocket and toward the arcuate bearing surface of the guide portion; the guide plate further includes a pair of lugs and ribs to prevent the pretensioner tube from colliding and making noise during normal use of the retractor assembly; the ball bearings are the core component of the pretensioner, and their movement directly drives the pawl disc and shaft to rotate, realizing the pretensioning function of the seatbelt. If the ball bearing channel is blocked, the ball bearings cannot enter or exit the track, resulting in the seatbelt not being able to tighten in time, thus losing its protective function for the passenger. Keeping the ball bearing channel of the pretensioner unblocked is crucial for the smooth rolling of the ball bearings.

[0004] To address the aforementioned issues, there is an urgent need for innovative design based on the existing belt pretensioner. Utility Model Content

[0005] The purpose of this invention is to provide a lap belt pretensioner assembly to solve the problem mentioned in the background art that if the ball channel is blocked, the balls cannot enter or exit the track, which will cause the seat belt to fail to tighten in time and thus lose its protective function for passengers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waist belt pretensioner assembly, including a bracket mounted on a vehicle, a belt winding drum rotatably connected to the bracket, a drive wheel coaxially connected to the drum, a rotor fitted around the drive wheel, and the drive wheel rotating synchronously with the rotor; a guide support fitted around the rotor is mounted on the bracket, a ball bearing channel is fitted around the guide support, and an outlet for the balls to roll out of the ball bearing channel is provided on the ball bearing channel, the ball bearing channel communicating with the guide support through the outlet; a guide block is fitted into the ball bearing channel, the end of the guide block near the outlet is inclined, and a limiting mechanism is provided in the ball bearing channel to limit the position of the guide block, the limiting mechanism keeping the guide block sealed at the outlet position in the ball bearing channel; when the vehicle is driving normally, the internal sealing of the ball bearing channel can be maintained to prevent dust from entering the ball bearing channel and causing blockage, and in emergency situations, the balls can roll smoothly in the ball bearing channel.

[0007] Preferably, the limiting mechanism includes a stepped slide bar fixedly connected to the guide block away from the outlet end, and the stepped slide bar is slidably connected through the ball channel.

[0008] Preferably, a limit spring is elastically connected between the guide block and the ball channel.

[0009] Preferably, the ball channel is rotatably mounted on the bracket, and the bracket is provided with a steering mechanism for controlling the rotation of the ball channel.

[0010] Preferably, the steering mechanism includes a protruding rod connected in the axial direction of the ball channel rotation, the surface of the protruding rod being in contact with the outer inclined surface of the stepped slide rod.

[0011] Preferably, a locking block is slidably connected to the guide block, and a guide spring is elastically connected between the locking block and the guide block.

[0012] Preferably, the ball channel has a slot, and the locking block moves laterally and engages with the slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the belt pretensioner assembly can maintain the sealing of the ball channel when the car is driving normally, preventing dust from entering the ball channel and causing blockage, and ensuring that the balls can roll smoothly in the ball channel in an emergency.

[0014] Furthermore, a guide block is fitted into the ball channel, and a limiting mechanism is provided in the ball channel to limit the position of the guide block. The guide block is fitted into the ball channel and kept within the range of the outlet distance from the ball. The ball channel is kept in a relatively sealed state to prevent dust from entering the interior of the ball channel.

[0015] Furthermore, the ball channel is rotatably mounted on the bracket, which is equipped with a steering mechanism to control the rotation of the ball channel. When the balls start rolling, the ball channel is pushed and rotates, tilting towards the outlet end, which accelerates the rolling of the balls in the ball channel towards the outlet, further assisting the smooth movement of the balls in the ball channel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the bracket of this utility model.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the roll of this utility model.

[0018] Figure 3 This is a schematic diagram of the ball bearing channel structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the guide block structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the stepped slide bar structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the limiting spring structure of this utility model.

[0022] Figure 7 This is a schematic diagram of the card block structure of this utility model.

[0023] Figure 8 This is a schematic diagram of the protruding rod structure of this utility model.

[0024] Figure 9 This is a schematic diagram of the guide spring structure of this utility model.

[0025] In the diagram: 1. Support; 11. Drum; 12. Drive wheel; 13. Rotor; 14. Guide support; 15. Ball bearing channel; 16. Outlet; 2. Guide block; 3. Stepped slide bar; 4. Limiting spring; 5. Protruding rod; 6. Locking block; 61. Guide spring; 62. Locking groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: Please refer to Figures 1-9This utility model provides the following technical solution: a waist belt pretensioner assembly, including a bracket 1 mounted on a car, a waist belt rewinding drum 11 rotatably connected to the bracket 1, a drive wheel 12 coaxially connected to the drum 11, a rotor 13 being fitted around the drive wheel 12, and the drive wheel 12 and rotor 13 rotating synchronously; a guide support 14 fitted around the rotor 13 is mounted on the bracket 1, a ball channel 15 is fitted around the guide support 14, a plurality of balls are arranged in the ball channel 15, and the balls at the entrance of the ball channel 15 are subjected to pulsating loads. Under the influence of the load, this force gradually increases as the balls enter the load-bearing area, eventually reaching its maximum value in the load-bearing area, thereby pushing the balls to roll along the ball guide rail. The ball channel 15 has an outlet 16 for the balls to roll out, and the ball channel 15 is connected to the guide support 14 through the outlet 16. A guide block 2 is fitted in the ball channel 15, and the end of the guide block 2 near the outlet 16 is inclined. A limiting mechanism is provided in the ball channel 15 to limit the position of the guide block 2, and the limiting mechanism keeps the guide block 2 sealed at the outlet 16 in the ball channel 15.

[0028] The limiting mechanism includes a stepped slide bar 3 fixedly connected to the guide block 2 at the end away from the outlet 16, and the stepped slide bar 3 is slidably connected to the ball channel 15.

[0029] A limit spring 4 is elastically connected between the guide block 2 and the ball channel 15.

[0030] The bracket 1 is installed on the car, and the waist belt is connected and wound around the outside of the drum 11. Under normal conditions, the drum 11 can rotate in both directions to realize the operation of tightening and loosening the waist belt. Multiple rolling balls are provided in the ball channel 15. In case of emergency, high-pressure gas enters the inlet of the ball channel 15. The gas pushes the balls to move directionally along the path direction in the ball channel 15. The balls roll out through the outlet 16 on the ball channel 15 and enter the side of the rotor 13, pushing the rotor 13, drive wheel 12 and drum 11 to rotate, thereby realizing the tightening operation of the waist belt.

[0031] When the car is driving normally, the guide block 2 is fitted into the outlet 16 of the ball channel 15 to maintain the sealing of the ball rolling path in the ball channel 15 at this time, preventing external dust from entering the ball channel 15, thereby maintaining the unobstructed flow inside the ball channel 15 during the ball rolling process.

[0032] Under high pressure, the ball contacts the inclined surface of the guide block 2, pushing the guide block 2 to move away from the outlet 16. The guide block 2 drives the stepped slide bar 3 to move synchronously. The stepped slide bar 3 moves to compress the limit spring 4. When the guide block 2 moves to the end position of the ball channel 15, the inclined surface of the guide block 2 can guide the ball to roll into the guide support 14 so that the ball can contact the rotor 13.

[0033] Example 2: Based on Example 1, a steering mechanism is also disclosed, the specific structure of which is as follows: the ball channel 15 is rotatably mounted on the bracket 1, and the bracket 1 is provided with a steering mechanism for controlling the rotation of the ball channel 15.

[0034] The steering mechanism includes a protruding rod 5 connected to the ball channel 15 in the rotational axial direction, and the surface of the protruding rod 5 is in contact with the outer inclined surface of the stepped slide rod 3.

[0035] A locking block 6 is slidably connected to the guide block 2, and a guide spring 61 is elastically connected between the locking block 6 and the guide block 2.

[0036] The ball bearing channel 15 has a slot 62, and the locking block 6 moves laterally and engages with the slot 62.

[0037] When the stepped slide bar 3 slides through the ball channel 15, the inclined surface on the side of the stepped slide bar 3 contacts the protruding rod 5. When the protruding rod 5 contacts the outer surfaces of the stepped slide bar 3 with different diameters, the protruding rod 5 rotates. The rotating protruding rod 5 drives the ball channel 15 to rotate, causing the ball channel 15 to rotate towards the outlet 16. This allows the balls to roll faster towards the outlet 16 under the action of the inclined ball channel 15, thereby further maintaining the smooth rolling of the balls in the ball channel 15.

[0038] When the guide block 2 moves to the end of the ball channel 15, the locking block 6 on the guide block 2 corresponds to the locking groove 62 on the ball channel 15. At this time, the surface of the locking block 6 is not subjected to pressure. Under the elastic thrust of the guide spring 61, the locking block 6 pops outward, so that the locking block 6 is engaged in the locking groove 62. This limits the position of the guide block 2 at this time, and keeps the internal channel of the ball channel 15 unobstructed.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A belt pretensioner assembly, comprising a bracket (1) mounted on a vehicle, wherein a belt rewinding / unwinding reel (11) is rotatably connected to the bracket (1), characterized in that: A drive wheel (12) is coaxially connected to the drum (11), and a rotor (13) is fitted onto the outside of the drive wheel (12). The drive wheel (12) and the rotor (13) rotate synchronously. The bracket (1) is equipped with a guide support (14) sleeved on the outside of the rotor (13). A ball channel (15) is sleeved on the outside of the guide support (14). An outlet (16) for the balls to roll out is opened on the ball channel (15). The ball channel (15) is connected to the guide support (14) through the outlet (16). A guide block (2) is fitted into the ball channel (15). The end of the guide block (2) near the outlet (16) is inclined. A limiting mechanism is provided in the ball channel (15) to limit the position of the guide block (2). The limiting mechanism keeps the guide block (2) sealed at the outlet (16) in the ball channel (15).

2. A belt pretensioner assembly according to claim 1, characterized in that: The limiting mechanism includes a stepped slide bar (3) fixedly connected to the guide block (2) at the end away from the outlet (16), and the stepped slide bar (3) is slidably connected through the ball channel (15).

3. A belt pretensioner assembly according to claim 2, wherein: A limit spring (4) is elastically connected between the guide block (2) and the ball channel (15).

4. A belt pretensioner assembly according to claim 1, characterized in that: The ball channel (15) is rotatably mounted on the bracket (1), and the bracket (1) is provided with a steering mechanism to control the rotation of the ball channel (15).

5. A belt pretensioner assembly according to claim 4, wherein: The steering mechanism includes a protruding rod (5) connected in the axial direction of the ball channel (15), and the surface of the protruding rod (5) is attached to the outer inclined surface of the stepped slide rod (3).

6. A belt pretensioner assembly according to claim 5, wherein: The guide block (2) is fitted with a sliding block (6), and a guide spring (61) is elastically connected between the block (6) and the guide block (2).

7. A belt pretensioner assembly according to claim 6, wherein: The ball channel (15) is provided with a slot (62), and the card block (6) moves laterally and engages with the slot (62).

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