Novel safety belt locking device based on non-Newtonian fluid

Abstract

The invention discloses a novel safety belt locking device based on non-Newtonian fluid. The novel safety belt locking device is characterized by mainly comprising a belt containing groove, a bearing, a locking device cover plate, a rotating shaft, a limiting key and a locking device base. The limiting key is composed of a locking hook, a limiting magnet, a spring and a stress flat plate, and the locker base is composed of an outer wall, a liquid storage gap, a locking hole and a threaded hole. The limiting magnet is a permanent magnet and is welded on the limiting key, and the rotating shaft body is of an electromagnet structure. During use, the rotating shaft penetrates through the bearing and a central hole of the locking device cover plate, a connecting pair is arranged in a central notch of the locking device base, a shaft body part of the rotating shaft is connected with the belt containing groove, a safety belt braid is hung on the shaft body of the rotating shaft, the bearing is loaded in the central notch of the locking device cover plate, and an inner ring is welded to the rotating shaft. The locking device cover plate and the locking device base are fixed and sealed through bolts, and shear thickening type non-Newtonian fluid is poured into the base. The shaft body of the rotating shaft can be lengthened during manufacturing so as to be compatible with other traditional safety belt components such as a retractor. The invention can realize the following functions: (1) sensitive locking of the braid; and (2) sensitive locking of the vehicle.

Description

Technical Field

[0001] The invention relates to a core component of a vehicle passenger front restraint system, in particular to a core component of a safety belt retracting and locking system. Background Art

[0002] In actual production and use, the traditional seat belt retraction and locking system has shown good reliability and can effectively reduce the injuries caused by car accidents and high-altitude operations. However, the system still has the following problems that need to be solved: (1) The extension position of the pawl and the position of the ratchet teeth need to be highly matched, otherwise serious problems such as tooth collision, tooth slippage, and jamming are likely to occur. This places extremely high demands on assembly and part stability. (2) The webbing sensitive parts work based on centrifugal force. Whether the webbing is pulled out or put back quickly, it will move. Therefore, when the occupant unfastens the seat belt, the webbing is quickly retracted under the action of the winding spring, and there is a certain probability that it will be locked, resulting in the occupant being unable to pull out the webbing the next time he uses it. This phenomenon is called Back Locking. This problem is caused by the design principle, and currently no major supplier has a good solution. (3) The vehicle sensitive parts are free-moving steel balls. When the vehicle body moves, it is very easy to produce noise due to vibration. [1] In the current environment where vehicle noise control is getting better and better, this problem is becoming increasingly prominent. (4) Considering the comfort needs of passengers, OEMs have increasingly stringent requirements on the error range of the locking threshold. The current mechanical system is restricted by parts and assembly processes and cannot meet the requirements of some OEMs. (5) Under conditions such as long-term use and rust caused by water ingress, the strength of the locking mechanism material is easily reduced, and the steel balls, ratchets, and ratchet parts in the locker are worn, which may even cause the locker to fail. [2] (6) To adapt to the development of active safety systems, more and more OEMs have proposed the concept of electronic vehicle sensitivity, which uses sensors to sense vehicle status and actuators to control triggers. The current design cannot meet this future market demand.

[0003] Considering that with the popularity of new energy vehicles around the world, the degree of automobile intelligence, automation, and networking has further deepened, the demand for developing a new seat belt locking structure that can be combined with the seat belt protection structure and can adapt to the development of automobile intelligence and active tensioning seat belts has further increased. Therefore, a new seat belt locker that adapts to technological progress and market demand is urgently needed. Summary of the invention

[0004] In order to make up for the defects of the prior art, the present invention provides a new seat belt locker based on non-Newtonian fluid.

[0005] The technical solution adopted by the present invention is: a new type of seat belt locker based on non-Newtonian fluid, characterized in that: it mainly consists of a belt placement groove (1), a bearing (2), a locker cover plate (3), a rotating shaft (4), a limit key (5), and a locker base (6); the limit key consists of a locking hook (9), a limit magnet (10), a spring (11) and a force-bearing plate (12); the locker base consists of an outer wall, a liquid storage gap (11), and a locking hole (14); the rotating shaft consists of a shaft body (13) and a connecting pair (8); the limit magnet (10) is a permanent magnet and is welded on the limit key (5). The rotating shaft body (13) is an electromagnet structure; when in use, the rotating shaft (4) passes through the central hole of the bearing (2) and the lock cover plate (3), the connecting pair (8) is placed in the central notch of the lock base (6), the rotating shaft body (13) is connected to the belt placement groove (1), the safety belt webbing is mounted on the rotating shaft body (13), the bearing (2) is loaded in the central notch of the lock cover plate (3), the inner ring is welded to the rotating shaft (4), the lock cover plate (3) and the lock base (6) are fixed and sealed with bolts, and the lock base (6) is filled with a shear thickening type non-Newtonian fluid.

[0006] The limit key locking hook (9) will engage with the locking hole (14) in the locked state. Beneficial Effects

[0007] The lock has the following advantages: (1) Simple structure, few parts, and most of them can be manufactured by casting; large tolerance range, low part precision requirements, economical and practical. (2) When the webbing is subjected to impact force, the rotating shaft can provide a strong reaction force and release a small displacement (the fluid will still have a small displacement when the shear thickening effect occurs). At this time, the webbing is similar to a spring with a very high stiffness coefficient, which can transform the rigid impact on the chest of the occupant given by the existing lock design into a flexible impact. Reduce the damage to the body caused by the occupant after being restrained by the seat belt. (3) Add active restraint links, which can be used in conjunction with intelligent vehicles (4) The system has high integration, good sealing performance, and is not easy to get water and rust (5) The ratchet-ratchet meshing system is eliminated, which is less prone to wear and tear and has improved durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 An exploded view of the overall structure of a new seat belt lock based on non-Newtonian fluid Figure 2 Isometric view of a new seat belt locker based on non-Newtonian fluid Figure 3 Axonometric drawing of the working structure of a new seat belt locker based on non-Newtonian fluid (hidden belt device, locker cover, bearing) Figure 4A plan view of the working structure of a new seat belt locker based on non-Newtonian fluid (unlocked state) Figure 5 A cross-sectional view of the working structure of a new seat belt locker based on non-Newtonian fluid Figure 6 A plan view of the working structure of a new seat belt locker based on non-Newtonian fluid (locked state) DETAILED DESCRIPTION

[0009] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0010] As shown in the figure, a new type of seat belt locker based on non-Newtonian fluid is characterized in that it is mainly composed of a belt groove (1), a bearing (2), a locker cover plate (3), a rotating shaft (4), a limit key (5), and a locker base (6); the limit key is composed of a locking hook (9), a limit magnet (10), a spring (11) and a force-bearing plate (12); the locker base is composed of an outer wall, a liquid storage gap (11), and a locking hole (14); the rotating shaft is composed of a shaft body (13) and a connecting pair (8); the limit magnet (10) is a permanent magnet, welded on the limit key (5), and rotates The shaft body (13) is an electromagnet structure; when in use, the rotating shaft (4) passes through the central hole of the bearing (2) and the lock cover (3), the connecting pair (8) is placed in the central notch of the lock base (6), the rotating shaft body (13) is connected to the belt placement groove (1), the safety belt webbing is mounted on the rotating shaft body (13), the bearing (2) is loaded in the central notch of the lock cover (3), the inner ring is welded to the rotating shaft (4), the lock cover (3) and the lock base (6) are fixed and sealed with bolts, and the lock base (6) is filled with a shear thickening type non-Newtonian fluid. The limit key locking hook (9) will engage with the locking hole (14) in the locked state.

[0011] Working process of the present invention: Webbing sensitive locking. When the webbing is pulled by a person, there are three possibilities: (1) When the webbing is pulled out slowly, the rotation speed of the rotating shaft is low, and the speed of the limit key is low, which makes the viscosity of the non-Newtonian fluid low. At the same time, the force exerted by the fluid on the force plate is weak, which is not enough to push the limit key to the engagement position with the locking hole, so the webbing can be pulled out smoothly. (2) When the webbing is pulled out quickly, the rotation speed of the rotating shaft is high, and the movement speed of the limit key is high. The shear force on the non-Newtonian fluid increases, the viscosity of the fluid increases, and the relative speed between the force plate of the limit key and the fluid increases. Under the dual effects of increased viscosity and increased relative speed, the force exerted on the force plate increases, pushing the limit key inward, so that the locking hook can hook the locking hole on the base of the lock, preventing the webbing from continuing to stretch. After the force exerted on the webbing disappears, the locking hook disengages from the lock, and under the action of the spring, the limit key returns to the initial position, allowing the webbing to continue to stretch. (3) When the webbing is subjected to a great impact force (for example, a car collides with an obstacle in front), the speed of the rotating shaft suddenly increases, and the speed and acceleration of the limit key suddenly increase. Due to the shear thickening characteristics of the non-Newtonian fluid, the force of the non-Newtonian fluid on the load-bearing plate and the connecting pair increases instantly, and the reaction force on the connecting pair also increases instantly to the maximum value. At the same time, the limit key is instantly ejected and engages with the locking hole, preventing the webbing from extending, thereby firmly fixing the occupant in the seat.

[0012] Vehicle sensitive locking. When the vehicle detects a dangerous situation ahead or brakes suddenly, the sensor responds, energizing the rotating shaft to form an electromagnet. The magnetic pole of the rotating shaft near the base of the lock is opposite to the limit magnetic pole. The electromagnetic repulsive force causes the limit key to pop out and engage with the locking hole, fixing the occupant in the seat.

[0013] The present invention is not limited to the above-mentioned specific embodiments. Those skilled in the art to which the present invention belongs may make various modifications, supplements or substitute the described specific embodiments in similar ways without departing from the spirit of the present invention or exceeding the scope defined by the attached claims, which are all within the scope of protection required by the present invention.

Claims

1. A new seat belt locker based on non-Newtonian fluid, characterized by: The invention mainly comprises a belt groove (1), a bearing (2), a locking cover plate (3), a rotating shaft (4), a limit key (5), and a locking base (6); the limit key comprises a locking hook (9), a limit magnet (10), a spring (11), and a force-bearing plate (12); the locking base comprises an outer wall, a liquid storage gap (11), and a locking hole (14); the rotating shaft comprises a shaft body (13) and a connecting pair (8); the limit magnet (10) is a permanent magnet welded on the limit key (5), and the rotating shaft shaft body (13) is an electromagnet structure; use When the safety belt is installed, the rotating shaft (4) passes through the central hole of the bearing (2) and the lock cover (3), the connecting pair (8) is placed in the central notch of the lock base (6), the rotating shaft body (13) is connected to the belt groove (1), the safety belt webbing is mounted on the rotating shaft body (13), the bearing (2) is loaded in the central notch of the lock cover (3), the inner ring is welded to the rotating shaft (4), the lock cover (3) and the lock base (6) are fixed and sealed with bolts, and the shear thickening type non-Newtonian fluid is poured into the lock base (6).

2. A novel seat belt locker based on non-Newtonian fluid according to claim 1, characterized in that: The limit key locking hook (9) will engage with the locking hole (14) in the locked state.

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