A seat belt retractor pre-tensioning structure

Abstract

The present application relates to the field of seat belt retractor, and aims to solve the problem of pre-tightening of the seat belt retractor, and discloses a seat belt retractor pre-tightening structure, which comprises a storage box and a positioning plate, the storage box is fixedly assembled with the positioning plate, a rotating shaft is transversely inserted into the storage box, a friction cylinder is fixedly sleeved on the middle part of the surface of the rotating shaft, second chain wheels are symmetrically sleeved on both ends of the surface of the rotating shaft, a support frame is sleeved on the rotating shaft between the second chain wheels and the friction cylinder, and the support frame is arranged on the left side and the right side respectively. The seat belt is quickly pulled out for positioning when the seat belt is pulled out in the mode of driving the small wheel by the large wheel, the seat belt remaining in the retractor is less, the danger caused by the failure of the seat belt retractor is prevented, and the pre-tightening of the seat belt is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seat belt retractor, in particular to a seat belt retractor pre-tightening structure. BACKGROUND

[0002] The retractor is the core component of the seat belt, accounting for 60%-95% of the cost of the seat belt. The seat belt retractor of the automobile seat is characterized in that the component sensing the acceleration of the belt is composed of a circular belt reel and at least one ratchet wheel fixedly installed at the end of the reel. The circular belt reel is movably penetrated into the oval-shaped shaft hole of the main plate on both sides of the belt reel chamber, and the inner ratchet tooth is arranged obliquely above the oval-shaped shaft hole on the inner side of the main plate, which forms a locking component with the ratchet wheel.

[0003] A pre-tightening type automobile seat belt retractor disclosed in CN201205903Y comprises a belt, a belt reel, a cover, a gas generator and a conduit. The belt is wound around the belt reel, the end of which is sleeved with a circular disc, and a plurality of spherical cavities are arranged on the outer edge of the circular disc. The cover is sleeved at the end of the circular disc of the belt reel, and a ball collector is arranged in the cover. The end of the conduit is provided with the gas generator, and the other end is connected with the cover. A plurality of abacus bead-shaped balls are arranged in the conduit, and the outer circumferential surface of each ball is in close contact with the wall of the conduit and cooperates with each spherical cavity. Through the above structure, the impact of the gas generator on the ball at the moment of collision can drive the circular disc to rotate, thereby effectively pre-tightening the seat belt and restraining the passenger on the back of the seat. Most of the current pre-tightening structures are controlled by the principle of the gas generator, which has certain risks and may fail. Pure mechanical pre-tightening is safer and has lower cost.

[0004] The current pre-tightening device of the seat belt retractor starts as follows: when a collision occurs, the sensor detects that the front collision is higher than the specified value, and the electric signal is transmitted to the electronic igniter of the power device to complete the start of the pre-tightening type seat belt. Specifically, the probe collects the collision information first, and then emits an electric pulse, which is transmitted to the gas generator to detonate the gas. The gas produced by the explosion rapidly expands in the pipeline and presses the so-called ball chain, causing the ball to move forward in the pipeline, driving the pawl disc to rotate. The pawl disc is integrated with the shaft, and the seat belt is wound around the shaft. The ball is driven to rotate by the gas pressure, thereby realizing the pre-tightening function. This explosive type has certain risks, and the probe may fail, thereby failing to complete the pre-tightening. When the retractor fails, the restraining force of the seat belt is reduced, which may cause danger. How to pre-tighten before the retractor to increase safety protection, the inventor has invented a seat belt retractor pre-tightening structure to solve the problem of pre-tightening of the seat belt retractor. SUMMARY

[0005] The present application aims at solving the problems of the prior art, and provides a safety belt retractor pre-tightening structure.

[0006] The present application is realized by the following technical scheme:

[0007] The safety belt retractor pre-tightening structure comprises a storage box and a positioning plate, the storage box and the positioning plate are fixedly assembled, a rotating shaft is transversely inserted into the storage box, a friction cylinder is fixedly sleeved on the middle part of the surface of the rotating shaft, second chain wheels are fixedly sleeved on both ends of the surface of the rotating shaft in a symmetrical manner, a support frame is arranged outside the rotating shaft and is arranged between the second chain wheels, the support frame is arranged on both left and right sides, a third chain wheel is fixedly sleeved on the rotating shaft on the left side of the friction cylinder, first sleeves are fixedly arranged on the top ends of the support frames, a first rotating shaft is rotatably connected between the two first sleeves, a sleeve frame is fixedly arranged on the middle part of the first rotating shaft, a sleeve box is fixedly sleeved on the sleeve frame, first chain wheels are sleeved on both ends of the surface of the first rotating shaft, a first chain is arranged between the first chain wheels and the second chain wheels, a second rotating shaft and a third rotating shaft are arranged between the support frames, first gears are fixedly sleeved on both sides of the surface of the second rotating shaft in a symmetrical manner, second gears are fixedly sleeved on both sides of the surface of the third rotating shaft in a symmetrical manner, a first rotating cylinder is sleeved on the surface of the second rotating shaft, a second rotating cylinder is sleeved on the surface of the third rotating shaft, a fourth chain wheel is sleeved on the left side of the second rotating cylinder and outside the third rotating shaft, a second chain is sleeved between the fourth chain wheel and the third chain wheel, an extrusion cylinder is arranged in front of the intersection of the first rotating cylinder and the second rotating cylinder, a movable shaft is arranged between the extrusion cylinder and the support frame on the right side, and a supporting shaft is arranged between the extrusion cylinder and the support frame on the left side.

[0008] Compared with the prior art, the present application has the following beneficial effects:

[0009] Through the cooperation of the third chain wheel and the fourth chain wheel, the principle of large wheels driving small wheels is utilized to drive the first rotating cylinder and the second rotating cylinder to rotate, the safety belt is quickly conveyed, and two-thirds of the safety belt in the retractor is pulled out, only one-third is reserved, the first rotating cylinder and the second rotating cylinder play the role of positioning and tensioning, the extrusion of the pushing block in the extrusion cylinder can tension and position the pulled-out safety belt, most of the safety belt remaining in the retractor is pulled out, which prevents the danger caused by the failure of the retractor, the safety belt is pulled out first, the pulled-out safety belt is positioned, the pre-tightening of the safety belt is realized, the problem of retractor failure is avoided, the support frame supports, and the tightening structure is more stable.

[0010] As preferred, the extrusion cylinder is a hollow structure, and the extrusion cylinder is tightly fitted at the intersection of the first rotary cylinder and the second rotary cylinder.

[0011] As preferred, a through slot is arranged in the storage box, and a bearing is arranged between the first sleeve ring and the first rotary shaft.

[0012] As preferred, the first gear is engaged with the second gear, and bearings are arranged between the second rotary shaft and the third rotary shaft and the support frame respectively.

[0013] As preferred, a bearing is arranged between the extrusion cylinder and the movable shaft, the extrusion cylinder is arranged at the intersection of the first rotary cylinder and the second rotary cylinder, and long strip-shaped rubber blocks are evenly arranged on the surfaces of the first rotary cylinder and the second rotary cylinder.

[0014] As preferred, the diameter of the third sprocket is five times that of the fourth sprocket.

[0015] As preferred, a rubber sleeve is sleeved on the surface of the friction cylinder, the friction cylinder is fixedly assembled with the rotary shaft, and a bearing is arranged between the rotary shaft and the storage box.

[0016] The safety belt retractor pre-tightening structure uses the mode of driving a small wheel by a large wheel to quickly pull out the safety belt in the retractor, so that the storage of the safety belt in the retractor is less, and when the retractor fails, the safety belt cannot be used to constrain the user, and the pre-tightening mode makes the wearing of the safety belt safer. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a structural schematic diagram of the present application.

[0018] Fig. 2 It is a schematic diagram of the present application cooperating with the safety belt.

[0019] Fig. 3 It is a schematic diagram of the present application tightening the safety belt.

[0020] Label explanation: 1, box, 2, frame, 3, first rotary shaft, 4, first sleeve ring, 5, first chain, 6, first sprocket, 7, positioning plate, 8, support frame, 9, second rotary shaft, 10, first gear, 11, first rotary cylinder, 12, movable shaft, 13, extrusion cylinder, 14, second rotary cylinder, 15, storage box, 16, through slot, 17, friction cylinder, 18, second sprocket, 19, rotary shaft, 20, third sprocket, 21, second chain, 22, fourth sprocket, 23, second gear, 24, third rotary shaft, 25, support shaft. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0022] Please refer to Figs. 1-3 The present application provides a technical solution:

[0023] The safety belt retractor pre-tightening structure comprises a storage box 15 and a positioning plate 7, the storage box 15 is fixedly assembled with the positioning plate 7, a rotating shaft 19 is transversely inserted into the inside of the storage box 15, a friction cylinder 17 is fixedly sleeved on the middle part of the surface of the rotating shaft 19, the friction cylinder 17 is arranged to increase the friction between the safety belt, the safety belt drives the friction cylinder 17 to rotate when the safety belt is pulled, a second sprocket 18 is fixedly sleeved on the surface of the rotating shaft 19 at both ends in a symmetrical manner, a support frame 8 is arranged outside the rotating shaft 19 between the second sprocket 18 and the friction cylinder 17, the support frame 8 is arranged in two and is arranged on the left and right sides respectively, a third sprocket 20 is fixedly sleeved on the rotating shaft 19 on the left side of the friction cylinder 17, a first sleeve ring 4 is fixedly arranged on the top end of the support frame 8, a first rotating shaft 3 is rotatably connected between the two first sleeve rings 4, a sleeve frame 2 is fixedly arranged in the middle of the first rotating shaft 3, a sleeve box 1 is fixedly sleeved outside the sleeve frame 2, a first sprocket 6 is fixedly sleeved on the surface of the first rotating shaft 3 at both ends, a first chain 5 is arranged between the first sprocket 6 and the second sprocket 18, a second rotating shaft 9 and a third rotating shaft 24 are arranged between the two support frames 8, a first gear 10 is fixedly sleeved on the surface of the second rotating shaft 9 at both sides in a symmetrical manner, a second gear 23 is fixedly sleeved on the surface of the third rotating shaft 24 at both sides in a symmetrical manner, a first rotating cylinder 11 is fixedly sleeved on the surface of the second rotating shaft 9, a second rotating cylinder 14 is fixedly sleeved on the surface of the third rotating shaft 24, a fourth sprocket 22 is fixedly sleeved outside the third rotating shaft 24 on the left side of the second rotating cylinder 14, a second chain 21 is sleeved between the fourth sprocket 22 and the third sprocket 20, in the manner of a large wheel driving a small wheel, the safety belt can be quickly pulled out when the safety belt is pulled, the safety belt in the retractor is pulled out, a pressing cylinder 13 is arranged in front of the intersection of the first rotating cylinder 11 and the second rotating cylinder 14, a movable shaft 12 is arranged between the pressing cylinder 13 and the support frame 8 on the right side, and a supporting shaft 25 is arranged between the pressing cylinder 13 and the support frame 8 on the left side.

[0024] The pressing cylinder 13 is a hollow structure, the pressing cylinder 13 is tightly fitted at the intersection of the first rotating cylinder 11 and the second rotating cylinder 14, and a pushing force towards the middle is provided by the pressing cylinder 13 when the safety belt is pulled, so as to assist the excess safety belt to enter between the first rotating cylinder 11 and the second rotating cylinder 14.

[0025] The storage box 15 is provided with a through slot 16 in the middle, and a bearing is arranged between the first collar 4 and the first rotating shaft 3.

[0026] The first gear 10 is engaged with the second gear 23, bearings are arranged between the second rotating shaft 9 and the third rotating shaft 24 and the support frame 8, and a bearing is arranged between the support frame 8 and the rotating shaft 19.

[0027] The extrusion cylinder 13 is arranged at the intersection of the first rotating cylinder 11 and the second rotating cylinder 14, and long rubber blocks are evenly arranged on the surfaces of the first rotating cylinder 11 and the second rotating cylinder 14.

[0028] The diameter of the third chain wheel 20 is five times that of the fourth chain wheel 22.

[0029] The friction cylinder 17 is provided with a rubber sleeve on the surface, is fixedly assembled with the rotating shaft 19, and a bearing is arranged between the rotating shaft 19 and the storage box 15.

[0030] Working principle: the friction force of the friction cylinder 17 on the safety belt is utilized, and when the safety belt is pulled, the friction cylinder 17 is driven to rotate, and through a series of chain transmission, the large wheel drives the small wheel, and the first rotating cylinder 11 and the second rotating cylinder 14 are rapidly rotated, due to the engagement of the first gear 10 and the second gear 23, the safety belt between the first rotating cylinder 11 and the second rotating cylinder 14 is pulled to the rear of the rotating cylinder, at the same time, through the cooperation of the first chain 5 and the first chain wheel 6 and the second chain wheel 18, the sleeve box 1 is driven to rotate, and the safety belt inserted in the sleeve box 1 is wound in the sleeve box 1, and the positioning of the safety belt is further realized, that is, when the locking buckle of the safety belt is clamped, most of the safety belt in the winding device is pulled out in advance, so that even if the winding device fails, the safety of the personnel is ensured due to the positioning of the safety belt in front.

[0031] Specific operation process: first, the pre-tightening structure is installed above the retractor, the first time, the seat belt is pulled out through the slot 16 and the slot in the box 1, the lock is above the box 1, each time the seat belt is retracted to the retractor, the lock is also above the box 1, the size of the pre-tightening structure is similar to the size of the retractor, if the length of the seat belt is 2 meters, the length of the seat belt pulled out is controlled to be 1.8 meters, the specific operation is that the seat belt is pulled, the friction between the seat belt and the friction cylinder 17 drives the friction cylinder 17 to rotate, and then the rotating shaft 19 rotates, the third sprocket 20 rotates through the meshing of the second chain 21, thereby driving the fourth sprocket 22 to rotate, the third rotating shaft 24 rotates, the second rotating cylinder 14 rotates, since the extrusion cylinder 13 is also attached to the seat belt, the extrusion cylinder 13 also rotates when the seat belt is pulled, since the extrusion cylinder 13 is attached to the first rotating cylinder 11 and the second rotating cylinder 14, the excess seat belt between the first rotating cylinder 11 and the second rotating cylinder 14 is extruded, the seat belt is clamped between the first rotating cylinder 11 and the second rotating cylinder 14, since the large wheel drives the small wheel, the rotating speed of the first rotating cylinder 11 and the second rotating cylinder 14 is fast, the excess part of the seat belt is pulled out from behind the first rotating cylinder 11 and the second rotating cylinder 14, at the same time, the sleeve frame 2 and the box 1 rotate circumferentially, further winding the seat belt, pre-tightening through the pre-tightening structure, when using the seat belt, most of the seat belt in the retractor can be pulled out for positioning, which can make the seat belt work in time when the retractor fails, and plays a pre-tightening role.

[0032] The specific embodiment is only an explanation of the application, not a limitation of the application, and those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, but as long as it is within the scope of the claims of the application, it is protected by the patent law.

Claims

1. A safety belt retractor pre-tensioning arrangement comprising a storage box (15) and a positioning plate (7), characterized in that: The storage box (15) is fixedly assembled between the positioning plate (7), a rotating shaft (19) is transversely inserted into the storage box (15), a friction cylinder (17) is fixedly sleeved on the middle part of the surface of the rotating shaft (19), second sprockets (18) are fixedly sleeved on both ends of the surface of the rotating shaft (19) in a symmetrical manner, a support frame (8) is arranged outside the rotating shaft (19) between the second sprockets (18) and the friction cylinder (17), the support frame (8) is arranged in two and is arranged on the left and right sides, respectively, a third sprocket (20) is fixedly sleeved on the rotating shaft on the left side of the friction cylinder (17), first collars (4) are fixedly assembled on the top ends of the support frames (8), a first rotating shaft (3) is rotatably connected between the two first collars (4), a sleeve frame (2) is fixedly assembled on the middle part of the first rotating shaft (3), a sleeve box (1) is fixedly sleeved on the sleeve frame (2), first sprockets (6) are fixedly sleeved on both ends of the surface of the first rotating shaft (3), a first chain (5) is arranged between the first sprockets (6) and the second sprockets (18), a second rotating shaft (9) and a third rotating shaft (24) are arranged between the two support frames (8), first gears (10) are fixedly sleeved on both sides of the surface of the second rotating shaft (9) in a symmetrical manner, second gears (23) are fixedly sleeved on both sides of the surface of the third rotating shaft (24) in a symmetrical manner, a first rotating cylinder (11) is fixedly sleeved on the surface of the second rotating shaft (9), a second rotating cylinder (14) is fixedly sleeved on the surface of the third rotating shaft (24), a fourth sprocket (22) is fixedly sleeved on the left side of the second rotating cylinder (14) and outside the third rotating shaft (24), a second chain (21) is sleeved between the fourth sprocket (22) and the third sprocket (20), a pressing cylinder (13) is arranged in front of the intersection of the first rotating cylinder (11) and the second rotating cylinder (14), a movable shaft (12) is arranged between the pressing cylinder (13) and the support frame (8) on the right side, and a supporting shaft (25) is arranged between the pressing cylinder (13) and the support frame (8) on the left side.

2. The pre-tensioner structure of a seat belt retractor according to claim 1, wherein: The pressing cylinder (13) is of a hollow structure, and the pressing cylinder (13) is tightly attached to the intersection of the first rotating cylinder (11) and the second rotating cylinder (14).

3. The pre-tensioner structure of claim 1, wherein: A through groove (16) is formed in the middle of the storage box (15), and a bearing is arranged between the first collar (4) and the first rotating shaft (3).

4. The pre-tensioner structure of claim 1, wherein: The first gear (10) is engaged with the second gear (23), and bearings are arranged between the second rotating shaft (9) and the third rotating shaft (24) and the support frame (8).

5. The pre-tensioner structure of a seat belt retractor according to claim 1, wherein: The pressing cylinder (13) is arranged at the intersection of the first rotating cylinder (11) and the second rotating cylinder (14), and long strip-shaped rubber blocks are evenly arranged on the surfaces of the first rotating cylinder (11) and the second rotating cylinder (14).

6. The pre-tensioner structure of a seat belt retractor according to claim 1, wherein: The diameter of the third sprocket (20) is five times that of the fourth sprocket (22).

7. The pre-tensioner structure of a seat belt retractor according to claim 1, wherein: A rubber sleeve is sleeved on the surface of the friction cylinder (17), the friction cylinder (17) is fixedly assembled with the rotating shaft (19), and a bearing is arranged between the rotating shaft (19) and the storage box (15).

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