Fixed shaft structure with force limiting effect for safety belt retractor

Abstract

The utility model discloses a fixed shaft structure for a safety belt retractor with a force limiting effect, which relates to the technical field of safety belts and comprises a shell and a coil spring seat mounted on the outer surface of the left side of the shell, the rotating shaft end of the coil spring seat is fixedly connected with a left shaft seat, and a locking device is arranged on the right side of the shell. The rotating shaft end of the locking device is fixedly connected with a right shaft seat, a main shaft is arranged on the inner surface of the shell, and force limiting mechanisms are arranged in the main shaft and at the two ends of the main shaft. Compared with an existing ordinary fixed shaft structure for the safety belt retractor, the fixed shaft structure with the force limiting effect for the safety belt retractor has the advantages that after the safety belt is locked by a locking device, if the inertia of a human body is large, the safety belt can drive the main shaft to rotate, and the torsion bar is twisted so that the safety belt can be buffered for a certain distance in a force limiting manner; the first fixing screw and the second fixing screw are screwed off, and the torsion bar can be installed and replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of safety belts, in particular to a fixed-axis structure for a safety belt retractor with a force-limiting effect. Background Art

[0002] The retractor refers to the retractor with emergency locking function, which is the core component of the car seat belt. It is used to lock the seat belt when the car collides, making it impossible to pull out and retract the seat belt, thereby fixing the person in the seat.

[0003] For example, the application number 202120689388.6 is a seat belt retractor and its fixed axis structure. The utility model changes the existing integrated fixed axis into a split fixed axis, which is formed by assembling the first and second parts, reducing the processing steps and improving production efficiency. However, it is difficult for the device to achieve a good force limiting effect to prevent the seat belt from being strangled too tightly and causing strangulation injuries to the driver or passengers. In addition, the internal force limiting components of the existing devices with force limiting effects are not easy to disassemble and replace.

[0004] Therefore, in view of this, the shortcomings of the existing structure are studied and improved, and a fixed-axis structure for a seat belt retractor with a force-limiting effect is proposed. Utility Model Content

[0005] The utility model aims to provide a fixed axis structure for a seat belt retractor with a force limiting effect, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fixed axis structure for a seat belt retractor with a force-limiting effect, comprising a shell and a coil spring seat installed on the left outer surface of the shell, the rotating shaft end of the coil spring seat is fixedly connected to the left shaft seat, a locking device is provided on the right side of the shell, the rotating shaft end of the locking device is fixedly connected to the right shaft seat, a main shaft is provided on the inner surface of the shell, a force-limiting mechanism is provided inside and at both ends of the main shaft, and the outer cylindrical surface of the main shaft is fixedly connected to one end of the seat belt.

[0007] Preferably, the force limiting mechanism comprises a transmission tooth fixedly connected to the inner circumferential surface of the left side of the main shaft, a torsion bar is arranged inside the main shaft, and a meshing gear is fixedly connected to the outer circumferential surface of the left end of the torsion bar.

[0008] Preferably, a left fixing groove is provided on the right outer surface of the left axle seat, and the upper and lower surfaces of the left axle seat extend to the left end of the torsion bar and are internally threadedly connected with a first fixing screw.

[0009] Preferably, a right fixing groove is opened on the left outer surface of the right axle seat, a spring is fixedly connected to the inner surface of the right fixing groove, a slide is fixedly connected to one end of the spring, and the upper and lower surfaces of the right axle seat extend to the right end of the torsion bar and are internally threaded with a second fixing screw.

[0010] Preferably, a locking gear is fixedly connected to the outer cylindrical surface of the right end of the right shaft seat, a gunpowder gas generator is fixedly connected to the right outer surface of the shell, and a rack is slidably connected to the inside of the gunpowder gas generator.

[0011] Preferably, a limiting slider is fixedly connected to the rear surface of the rack, and the limiting slider is slidably connected to the inner and outer surfaces of the pushing cylinder of the gunpowder gas generator.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model is provided with a housing, a coil spring seat, a left axle seat, a left fixing groove, a first fixing screw, a locking device, a right axle seat, a right fixing groove, a spring, a slide plate, a second fixing screw, a main shaft, a force limiting mechanism, a transmission tooth, a torsion bar, and a meshing gear. When the safety belt is locked by the locking device, if the inertia of the human body is large, the safety belt can drive the main shaft to rotate, and the transmission tooth can drive the meshing gear to rotate, thereby driving the left end of the torsion bar to rotate under force, while the right end is relatively fixed, and the torsion bar will be twisted so that the safety belt can limit the force buffering distance at one end to prevent the safety belt from being too tight and causing strangulation. The torsion bar can be removed by unscrewing the first fixing screw and the second fixing screw. When installing a new one, the right end of the torsion bar can be first extended into the inside of the right fixing groove of the right axle seat, the slide plate can be pressed to compress the spring, and then the left end of the torsion bar can be clamped into the left fixing groove of the left axle seat, and the torsion bar can be installed and replaced.

[0014] 2. The utility model is provided with a locking gear, a gunpowder gas generator, a rack and a limit slider. When a car collides urgently, the gunpowder gas generator will be triggered to generate gas to impact the upper end of the rack, so that the rack drives the locking gear to rotate, drives the main shaft to rotate, and thus tightens the seat belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0016] Figure 2 For this utility model Figure 1 A schematic diagram of a cross-sectional structure of a front view portion;

[0017] Figure 3 For this utility model Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0018] Figure 4 For this utility model Figure 1Schematic diagram of a partial three-dimensional structure;

[0019] Figure 5 For this utility model Figure 4 A schematic diagram of a partial split three-dimensional structure;

[0020] Figure 6 For this utility model Figure 5 A schematic diagram of the rear perspective structure of the propellant gas generator 9.

[0021] In the figure: 1, housing; 2, coil spring seat; 3, left shaft seat; 31, left fixing groove; 32, first fixing screw; 4, locking device; 5, right shaft seat; 51, right fixing groove; 52, spring; 53, slide plate; 54, second fixing screw; 6, main shaft; 7, force limiting mechanism; 71, transmission tooth; 72, torsion bar; 73, meshing gear; 8, locking gear; 9, gunpowder gas generator; 10, rack; 11, limit slider. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-Figure 3As shown, a fixed axis structure for a seat belt retractor with a force-limiting effect comprises a housing 1 and a coil spring seat 2 mounted on the left outer surface of the housing 1, a rotating shaft end of the coil spring seat 2 is fixedly connected to a left shaft seat 3, a locking device 4 is arranged on the right side of the housing 1, a rotating shaft end of the locking device 4 is fixedly connected to a right shaft seat 5, a main shaft 6 is arranged on the inner surface of the housing 1, a force-limiting mechanism 7 is arranged inside and at both ends of the main shaft 6, and the outer circumferential surface of the main shaft 6 is fixedly connected to one end of the seat belt, a spiral spring is arranged inside the coil spring seat 2, and a right shaft seat 5 is arranged inside the locking device 4. There are ratchet and lock teeth, the ratchet is fixedly connected to the right end of the right shaft seat 5, the force limiting mechanism 7 includes a transmission tooth 71 fixedly connected to the inner surface of the left side of the main shaft 6, a torsion bar 72 is arranged inside the main shaft 6, the outer surface of the left end of the torsion bar 72 is fixedly connected to a meshing gear 73, and the outer surface of the right end of the torsion bar 72 is fixedly connected to a pad to support the right end of the main shaft 6. The right outer surface of the left shaft seat 3 is provided with a left fixing groove 31, and the upper and lower surfaces of the left shaft seat 3 extend to the left end of the torsion bar 72 and are internally threaded with a first fixing screw 32. The left fixing groove The shape of the right fixing groove 51 and the right fixing groove 51 is square, the left and right ends of the torsion bar 72 are square, the left outer surface of the right shaft seat 5 is provided with a right fixing groove 51, the inner surface of the right fixing groove 51 is fixedly connected with a spring 52, one end of the spring 52 is fixedly connected with a slide plate 53, the upper and lower surfaces of the right shaft seat 5 extend to the right end of the torsion bar 72, and the second fixing screw 54 is connected with the inner thread. When the safety belt is locked by the locking device 4, if the inertia of the human body is large, the safety belt can drive the main shaft 6 to rotate, and the transmission tooth 71 can drive the meshing gear 73 to rotate. The left end of the torsion bar 72 is thereby driven to rotate under force, while the right end is relatively fixed. The torsion bar 72 will be twisted so that the safety belt can limit the force and buffer a certain distance to prevent the safety belt from being too tight and causing strangulation. The torsion bar 72 can be removed by unscrewing the first fixing screw 32 and the second fixing screw 54. When installing a new one, the right end of the torsion bar 72 can be first extended into the right fixing groove 51 of the right axle seat 5, the sliding plate 53 can be pressed to compress the spring 52, and then the left end of the torsion bar 72 can be stuck into the left fixing groove 31 of the left axle seat 3, and the torsion bar 72 can be installed and replaced.

[0024] like Figure 4-Figure 6 As shown, a locking gear 8 is fixedly connected to the outer cylindrical surface of the right end of the right shaft seat 5, a gunpowder gas generator 9 is fixedly connected to the right outer surface of the shell 1, and a rack 10 is slidably connected inside the gunpowder gas generator 9. The upper end of the rack 10 is a sliding piston, which can increase the contact surface.

[0025] Furthermore, the rear surface of the rack 10 is fixedly connected to a limiting slider 11, and the limiting slider 11 is slidably connected to the inner and outer surfaces of the push tube of the gunpowder gas generator 9. The right outer cylindrical surface of the gunpowder gas generator 9 extends to the inner cylindrical surface and is provided with a preset slide groove for the limiting slider 11 to slide.

[0026] Working principle: When using the fixed-axis structure for the seat belt retractor with force-limiting effect, first, after the seat belt is locked by the locking device 4, if the inertia of the human body is large, the seat belt can drive the main shaft 6 to rotate, and the transmission tooth 71 can drive the meshing gear 73 to rotate, thereby driving the left end of the torsion bar 72 to rotate under force, while the right end is relatively fixed, and the torsion bar 72 will be twisted so that the seat belt can be limited to buffer a distance to prevent the seat belt from being too tight and causing strangulation. The torsion bar 72 can be removed by unscrewing the first fixing screw 32 and the second fixing screw 54. When installing a new one, the right end of the torsion bar 72 can be first extended into the right fixed groove 51 of the right axle seat 5, the sliding plate 53 is pressed to compress the spring 52, and then the left end of the torsion bar 72 is inserted into the left fixed groove 31 of the left axle seat 3. The torsion bar 72 is installed and replaced. When the car collides urgently, the gunpowder gas generator 9 will be triggered to generate gas to impact the upper end of the rack 10, so that the rack 10 drives the locking gear 8 to rotate, and drives the main shaft 6 to rotate, thereby tightening the seat belt. This is the working principle of the fixed axis structure of the seat belt retractor with force limiting effect.

Claims

1. A fixed axis structure for a seat belt retractor with a force-limiting effect, comprising a housing (1) and a coil spring seat (2) mounted on the left outer surface of the housing (1), characterized in that: The rotating shaft end of the coil spring seat (2) is fixedly connected to a left shaft seat (3), a locking device (4) is arranged on the right side of the housing (1), the rotating shaft end of the locking device (4) is fixedly connected to a right shaft seat (5), a main shaft (6) is arranged on the inner surface of the housing (1), a limiting force mechanism (7) is arranged inside and at both ends of the main shaft (6), and the outer cylindrical surface of the main shaft (6) is fixedly connected to one end of the safety belt.

2. The fixed axis structure for a seat belt retractor with force limiting effect according to claim 1, characterized in that: The force limiting mechanism (7) comprises a transmission tooth (71) fixedly connected to the inner circumferential surface of the left side of the main shaft (6); a torsion bar (72) is arranged inside the main shaft (6); and a meshing gear (73) is fixedly connected to the outer circumferential surface of the left end of the torsion bar (72).

3. The fixed axis structure for a seat belt retractor with force limiting effect according to claim 1, characterized in that: A left fixing groove (31) is provided on the right outer surface of the left shaft seat (3), and a first fixing screw (32) is threadedly connected to the inner part of the upper and lower surfaces of the left shaft seat (3) extending to the left end of the torsion bar (72).

4. The fixed axis structure for a seat belt retractor with force limiting effect according to claim 1, characterized in that: A right fixing groove (51) is provided on the left outer surface of the right axle seat (5), a spring (52) is fixedly connected to the inner surface of the right fixing groove (51), one end of the spring (52) is fixedly connected to a slide plate (53), and the upper and lower surfaces of the right axle seat (5) extend to the right end of the torsion bar (72) and are internally threadedly connected to a second fixing screw (54).

5. The fixed axis structure for a seat belt retractor with force limiting effect according to claim 1, characterized in that: The outer cylindrical surface at the right end of the right shaft seat (5) is fixedly connected to a locking gear (8), the right outer surface of the housing (1) is fixedly connected to a gunpowder gas generator (9), and the inside of the gunpowder gas generator (9) is slidably connected to a rack (10).

6. The fixed axis structure for a seat belt retractor with force limiting effect according to claim 5, characterized in that: The rear surface of the rack (10) is fixedly connected to a limiting slider (11), and the limiting slider (11) is slidably connected to the inner and outer surfaces of the pushing cylinder of the gunpowder gas generator (9).

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