CN-121973724-A - Safety belt retractor

CN121973724ACN 121973724 ACN121973724 ACN 121973724ACN-121973724-A

Abstract

The invention relates to a seat belt retractor, which comprises a vehicle sensing assembly, an inertia body, an operating member, a locking rod, a supporting top and a locking rod, wherein the vehicle sensing assembly comprises a sensitive seat, the sensitive seat comprises a seat body provided with an inertia body supporting surface and a toothed plate provided with an external tooth part, the inertia body is provided with an operating member, a rib part with a convex structure is arranged on the toothed plate near the external tooth part and is formed at a position corresponding to a specified inclination angle of a seat back, the supporting top is arranged at the end part of the locking rod and can be abutted with the rib part to prevent the meshing part from meshing with the external tooth part, and the specified inclination angle is an angle at which a seat belt is not pulled out to be locked due to pulling out when the seat back is inclined. According to the safety belt retractor, the meshing action is prevented when the seat back reaches a specific inclination angle, the safety belt is allowed to be pulled out freely to adapt to the body change of a passenger, meanwhile, the passenger can define a normal functional area and an anti-misoperation locking area, the normal angle can meet the locking performance requirement, the normal pulling out of the webbing after the seat back is adjusted at a large angle can be realized, and the comfort requirement is met.

Inventors

YAMAMOTO KAZUMA
XU ZHIJUN
WANG CHAO
DUAN ZHONGXING

Assignees

宁波均胜汽车安全系统有限公司

Dates

Publication Date: 20260505
Application Date: 20260327

Claims (6)

1. A seatbelt retractor mounted on a seat back of a reclining seat provided on a vehicle and provided with a spindle for winding a seatbelt, a lock lever coupled to a shaft of the spindle in a friction-coupling manner, a vehicle-feel module for sensing an angle of the seat back and/or acceleration of the vehicle, and a locking mechanism for locking a pulling-out operation of the seatbelt in accordance with an adjustment of the angle of the seat back; the vehicle-sensing assembly is mounted on the frame of the retractor and can integrally tilt with the seat back, and comprises: A sensitive seat that is supported so as to be free from an axis along the vehicle width direction and that swings in the front-rear direction of the vehicle when the seatback is tilted, the sensitive seat including a seat body having an inertial body support surface and a toothed plate having external teeth; An inertial body supported on the inertial body support surface, the inertial body being displaced from a neutral position when an angle of the seatback and/or the vehicle acceleration exceeds a prescribed threshold; an operating member that, when the inertial body moves out of the neutral position, moves in conjunction therewith, and drives the locking mechanism to lock the spindle; The lock lever is configured to rotate in a first direction in which an engagement portion provided at a front end of the lock lever engages with the external tooth portion when the spindle is rotated in a direction in which the seat belt is pulled out in the spindle direction to lock the sensitive seat from swinging; it is characterized in that the method comprises the steps of, A rib part with a convex structure is arranged on the toothed plate and close to the external tooth part, and the rib part is formed at a position corresponding to a specified inclination angle of the seat back; The end part of the lock rod is also provided with a branch top part which is configured to be abutted with the rib part so as to prevent the meshing part from meshing with the external tooth part; the predetermined reclining angle is an angle at which the seat belt is not pulled out and locked when the seatback is reclined.
2. The seatbelt retractor according to claim 1, wherein the rib is one or more of a detachable structure, a position adjustable structure, or a combination of multi-shape components.
3. The seatbelt retractor according to claim 2, wherein the toothed plate is provided with a plurality of mounting holes or mounting grooves for the rib portion to be selectively mounted or position-adjusted, and the rib portion is at least partially embedded in the mounting holes or mounting grooves and extends at least partially to one side of the toothed plate.
4. The seatbelt retractor according to claim 3, wherein the engagement portion protrudes from an end portion of the lock lever toward the vehicle-sensing unit and is located on the same plane as the external gear portion, and the supporting portion protrudes from the lock lever toward the vehicle-sensing unit without being located on the plane, and is arranged such that a gap is left between the engagement portion and the external gear portion when the supporting portion is supported on the rib portion.
5. The seatbelt retractor according to any one of claims 1 to 4, wherein the vehicle sensing assembly further comprises a base and a bracket, the operating member comprises a main link and a secondary link, the base is mounted on the retractor frame through a back-off structure, two hollow cylinders of the bracket are in one-to-one correspondence and interference fit with two posts on the base, two sides of the sensitive base, opposite to the base and the bracket, are respectively provided with a coaxial shaft body, one side shaft body is rotatably mounted in a middle hole of the base, the other side shaft body is rotatably mounted in a middle hole of the bracket, the secondary link is movably mounted on the post of the base through a hole shaft clearance fit and is limited between the base and the bracket, the main link is rotatably mounted on the sensitive base and contacts with the secondary link when the inertial body is moved out of the neutral position, so that the main shaft is contacted with the secondary link to form locking the structure.
6. The seatbelt retractor according to claim 5, wherein a plate portion for supporting the sensitive seat is provided between the two hollow cylinders of the bracket, the plate portion is disposed opposite to and close to the toothed plate, and the plate portion has a recess for avoiding the rib portion and the top portion of the bracket.

Description

Safety belt retractor Technical Field The invention relates to the technical field of vehicle safety, in particular to a safety belt retractor. Background With continued advances in the automotive industry, consumer demand for ride comfort is increasing, particularly in the wide range of applications where recumbent seats such as zero gravity seats are used. Such seats allow the occupant to adjust the back tilt angle according to personal preferences to optimize the resting experience. In existing seat belt systems, the retractor is typically mounted to the seat back with the vehicle feel assembly responsible for monitoring the seat back angle change or vehicle acceleration. When the seat back is in a vertical or small-angle inclined state (for example, the inclined angle is not more than 15-27 degrees), the vehicle sensing component is kept stable, the locking mechanism is not activated, the safety belt can be pulled out smoothly, the shoulder and chest of a passenger are prevented from being pressed, and natural and comfortable wearing feeling is provided. However, when the reclining angle of the seat back increases beyond this range, the vehicle-feel assembly is displaced by gravity, triggering the locking mechanism, and the webbing cannot be pulled out further. According to the ergonomic principle, the larger the backward inclination angle of the seat back, the shoulder and chest of the passenger can be significantly protruded forward, and additional safety belt length is required to adapt to the body contour change, so that the fitting comfort is ensured. However, in the prior art, the locking mechanism is fixed once the seat belt is actuated, and cannot respond to such dynamic demands. As the angle of inclination continues to increase, the belt is gradually tightened, applying a continuously increasing pressure to the relevant body part, causing significant pressure and discomfort, and in severe cases, potentially affecting respiratory smoothness or causing local blood circulation obstruction. This problem is particularly pronounced in deep reclined or long ride scenarios, not only reducing the ride experience, but also potentially contributing to improper adjustment of the sitting position by the occupant or avoidance of seat belt use, thereby compromising the safety protection effect. The existing solutions fail to effectively coordinate the dynamic matching between the seat tilt angle and the seat belt pull-out amount, resulting in increasingly acute contradictions between comfort and safety. Disclosure of Invention Therefore, an object of the present invention is to provide a seatbelt retractor having an advantage of solving a problem of compression discomfort caused by a seatbelt being unable to be pulled out when a reclining angle of a seatback is increased, and improving comfort of a passenger. In order to solve the above-mentioned problems, the present invention provides a seatbelt retractor which is mounted on a seat back of a reclining seat provided in a vehicle and includes a spindle for winding a seatbelt, a lock rod coupled to the spindle in a friction-fit manner, a vehicle-feel module for sensing an angle of the seat back and/or acceleration of the vehicle, a lock mechanism for locking a pulling-out operation of the seatbelt during an adjustment of the angle of the seat back, a sensor seat which is mounted on a frame of the retractor and is capable of tilting integrally with the seat back, and which has a seat body which is supported in a free manner around an axis in a vehicle width direction, and which swings in a front-rear direction of the vehicle when the seat back is tilting-operated, and which includes a seat body having an inertial body support surface and a toothed plate having an external tooth portion, an inertial body which is supported on the seat body support surface, and which moves in a direction from a center position when the angle of the seat back and/or the acceleration of the vehicle exceeds a predetermined threshold value, a sensor seat back is mounted on the seat back, a sensor seat-feel module which is mounted on a frame of the retractor, and which is capable of tilting-feel integrally with the seat back, and which is provided with a boss-like outer tooth-shaped toothed portion which is engaged with the spindle in a rotation-shaped portion, and which is rotatably moves toward a first toothed portion when the spindle, and which is rotatably moves toward a second toothed portion, and which is disposed in a rotation-side of the spindle, and which is engaged with a rotation-shaped portion of the spindle, when the seat-shaped sensor seat is rotatably and which is rotatably moves toward a second toothed portion, and which is rotatably moves toward a boss portion, the rib portion is formed at a position corresponding to a predetermined inclination angle of the seat back, and a leg portion is further provided at an end portion of the lock lever, the leg portion being conf