Automobile safety belt end piece pretensioner

Abstract

The invention discloses an automobile safety belt end piece pretensioner which comprises a supporting frame, a reel, a coil spring structure and a braid, the reel is arranged on the supporting frame, the braid is wound on the reel, one end of the reel is connected with the coil spring structure arranged on the supporting frame, the automobile safety belt end piece pretensioner further comprises a motor and a transition wheel, the motor is arranged on the supporting frame, and the transition wheel is arranged on the supporting frame. The output end of the motor is connected with a transition wheel, and the transition wheel is arranged at the other end of the reel through a one-way meshing device. Under the normal wearing condition of the electric end piece pretensioner, the braid is attached to the human body, wearing is more comfortable, when a driver and passengers lean over to take objects or move the body to be relaxed, the braid can be pulled out, and wearing is more convenient and more comfortable; under the collision condition, the braid can be actively recycled, a gap between the braid and a human body is eliminated, and the collision safety is improved; in addition, the motor can be reused, no pungent gas is generated compared with a traditional scheme, the experience feeling is better, and the cost is relatively low.

Description

Technical Field

[0001] The invention relates to the technical field of automobile safety belts, in particular to an automobile safety belt end piece pretensioner. Background Art

[0002] The lower end piece of the car seat belt is one of the fixing points of the three-point car seat belt, which plays a role of restraint and fixation. At present, there are two structural forms in the industry. One is a metal lower end piece with a simple structure and only plays a fixing role; the other is a gunpowder end piece pretensioner, which can tighten the abdominal webbing of the driver and passenger before the car collision to reduce the movement of the driver and passenger's abdomen to the front of the car, which can better protect the driver and passenger, but has a complex structure and relatively high cost.

[0003] For example, the patent CN106032136A discloses a retractor, a seat belt winding device and a seat belt winding control method, wherein the retractor comprises: a coil spring, fixed to a mounting plate on one side of a frame of the seat belt winding device and connected to one end of a winding shaft of the seat belt winding device, for rotating the winding shaft and thus recovering the webbing; a motor, fixed to the frame and connected to one end of the winding shaft through a transmission device, for rotating the winding shaft and thus recovering the webbing; a damping device, for providing resistance to the webbing rewinding when the remaining rewinding amount of the webbing reaches a preset value damping force; before the remaining rewinding amount of the webbing reaches the preset value, the webbing rewinding speed can be made to rise and fall stably and evenly through the joint action of the motor and the coil spring. When the remaining rewinding amount of the webbing reaches the preset value, the damping device begins to intervene and provide a damping force to hinder the rewinding of the webbing, so as to reduce the rewinding speed of the webbing until the rewinding speed of the webbing is zero. The webbing runs smoothly during the whole process; this solution cannot tighten the abdominal webbing of the driver and passenger before a car collision to reduce the movement of the driver and passenger's abdomen toward the front of the car, and the active safety performance is relatively poor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an automobile safety belt end plate pretensioner, which can actively retract the webbing to eliminate the gap between the webbing and the human body in the event of a collision, thereby improving the collision safety performance and having a relatively low cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The automobile safety belt end plate pretensioner comprises a support frame, a reel, a coil spring structure and a webbing, wherein the reel is arranged on the support frame, the webbing is wound on the reel, one end of the reel is connected to the coil spring structure arranged on the support frame, and further comprises a motor and a transition wheel, wherein the motor is arranged on the support frame, the output end of the motor is connected to the transition wheel, and the transition wheel is arranged on the other end of the reel through a one-way clutch.

[0007] Further:

[0008] The transition wheel is a transition gear, and the output end of the motor is provided with a motor gear, and the motor gear and the transition gear are meshed.

[0009] A reel one-way meshing device is arranged on the other end of the reel, and a gear one-way meshing device corresponding to the reel one-way meshing device is arranged in the shaft hole of the transition wheel.

[0010] The support frame includes a mounting plate and a pair of ear plates arranged on the mounting plate. One end of the reel passes through an ear plate and is connected to a coil spring structure located outside the ear plate. The other end of the reel is arranged on the other ear plate through a bushing. The webbing is located between the pair of ear plates, and the motor is fixed on the mounting plate.

[0011] The transition wheel is located between a pair of ear plates.

[0012] A webbing guide sleeve is provided at the upper end of the mounting plate between a pair of ear plates, and a webbing lead-out groove for leading out a webbing lead-out end is provided on the webbing guide sleeve.

[0013] The coil spring structure comprises a coil spring and a coil spring cover, wherein the coil spring is located inside the coil spring cover, the coil spring cover is fixed to the outside of an ear plate, and the inner end of the coil spring is connected to one end of the winding shaft through a claw structure.

[0014] A limiting piece is arranged inside the coil spring cover, and the outer end of the coil spring is hung on the limiting piece.

[0015] The clamping claw structure comprises a coil spring clamping claw arranged at the inner end of the coil spring and a reel winding claw arranged on one end of the reel, and the coil spring clamping claw and the reel winding claw are matched with each other.

[0016] The coil spring of the coil spring structure is pre-wound with a corresponding number of turns to have an initial driving force setting.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The structure of the automobile seat belt end plate pretensioner is reasonably designed. When the electric end plate pretensioner is worn normally, the webbing fits the human body and is more comfortable to wear. When the driver or passenger leans over to take something or moves the body to relax, the webbing can be pulled out, making it more convenient and comfortable to wear. In the event of a collision, the webbing can be actively recovered to eliminate the gap between the webbing and the human body, thereby improving collision safety. In addition, the motor is reusable and does not produce pungent gas compared to traditional solutions, providing a better user experience and at a relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 It is an isometric schematic diagram of the pretensioner of the present invention.

[0021] Figure 2This is a schematic diagram of the explosion of the pretensioner of the present invention.

[0022] Figure 3 It is a front view schematic diagram of the pretensioner of the present invention.

[0023] Figure 4 For along Figure 3 AA section diagram.

[0024] Figure 5 For along Figure 3 Schematic diagram of the BB cross-section.

[0025] Figure 6 This is a working schematic diagram of the pretensioner of the present invention.

[0026] In the figure:

[0027] 1-spring cover, 1.1-limiting plate, 1.2-fixing structure, 2-spring, 2.1-spring claw Ⅰ, 2.2-spring claw Ⅱ, 3-spring plate, 4-support frame, 4.1-support frame limiting hole, 4.2-support frame upper end, 4.3-spring fixing hole, 5-reel, 5.1-reel winding claw, 5.2-reel one-way mesher, 5.3-reel limiting column, 6-ribbon, 6.1-ribbon lead-out end, 7-transition gear, 7.1-gear claw, 7.2-gear one-way mesher, 8-motor, 8.1-motor gear, 9-bushing, 10-ribbon guide sleeve, 10.1-ribbon lead-out groove. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0029] like Figures 1 to 6 As shown, the automobile seat belt end plate pretensioner includes a support frame 4, a reel 5, a coil spring structure, a motor 8, a transition wheel and a webbing 6; the reel 5 is arranged on the support frame 4, the reel is rotatably arranged on the support frame, the webbing is wound on the reel, and one end of the reel is connected to the coil spring structure arranged on the support frame; the motor is fixedly installed on the support frame, the output end of the motor 8 is connected to the transition wheel, and the transition wheel is arranged on the other end of the reel through a one-way clutch.

[0030] The output end of the motor is connected to the transition wheel through a transmission structure; the transmission structure can be a gear transmission structure or a toothed belt transmission structure; the output end of the motor is connected to the transition wheel through a toothed belt, or the output end of the motor is connected to the transition wheel through a meshing gear structure.

[0031] Preferably, a gear transmission structure is adopted; the transition wheel is a transition gear 7, the transition gear is arranged on the other end of the reel, and the output end of the motor is provided with a motor gear 8.1, and the motor gear and the transition gear are meshed.

[0032] Furthermore, a reel one-way meshing device 5.2 is provided on the other end of the reel, and a gear one-way meshing device 7.2 corresponding to the reel one-way meshing device is provided in the axial hole of the transition gear; the reel can recycle the webbing, and the reel one-way meshing device and the gear one-way meshing device are one-way meshing. When the reel is driven to rotate by the winding spring, the clockwise rotation of the reel one-way meshing device will not drive the gear one-way meshing device to rotate, making it easier to recycle the webbing and less pressure on the driver and passengers caused by the webbing; the motor drives the motor gear to rotate counterclockwise, and the motor gear drives the gear claw to rotate clockwise, and the wheel one-way meshing device drives the reel to rotate to realize webbing recovery, and the webbing wrapped around the reel can be pulled out by manually pulling the webbing lead-out end.

[0033] The support frame 4 includes a mounting plate and a pair of ear plates arranged on the mounting plate. The mounting plate is provided with a fixing hole for the overall installation of the pretensioner. The mounting plate and the pair of ear plates are an integrally bent structure with high structural strength. One end of the reel passes through an ear plate and is connected to a coil spring structure located outside the ear plate. The other end of the reel is arranged on the other ear plate through a bushing. The reel is rotatable on the pair of ear plates, the webbing is located between the pair of ear plates, and the motor is fixed on the mounting plate. The integrated arrangement has a compact structure.

[0034] The transition gear 7 is located between a pair of ear plates; a webbing guide sleeve 10 is provided at the upper end of the mounting plate between a pair of ear plates, and a webbing lead-out groove 10.1 for leading out the webbing lead-out end is provided on the webbing guide sleeve, which has a compact structure, occupies little space, and is convenient for layout.

[0035] Preferably, the coil spring structure includes a coil spring 2 and a coil spring cover 1, the coil spring is located in the coil spring cover, the coil spring cover is fixed to the outside of an ear plate, and the inner end of the coil spring is connected to one end of the winding shaft through a claw structure.

[0036] A limit plate 1.1 is provided inside the coil spring cover, the outer end of the coil spring is hung on the limit plate through a coil spring claw Ⅰ2.1, and the coil spring cover is fixed on the ear plate through a fixing structure 1.2 and a coil spring plate 3; the claw structure includes a coil spring claw Ⅱ2.2 provided at the inner end of the coil spring and a reel winding claw provided at one end of the reel, and the coil spring claw and the reel winding claw are arranged in coordination. The coil spring structure has an initial driving force setting for the corresponding number of pre-wound turns, and the initial state of the reel can drive the webbing to be recovered.

[0037] The vehicle seat belt end plate pretensioner of the present invention has a reasonable structural design. When the electric end plate pretensioner is worn normally, the webbing fits the human body and is more comfortable to wear. When the driver or passenger leans over to take something or moves the body to relax, the webbing can be pulled out, making it more convenient and comfortable to wear. In the event of a collision, the webbing can be actively recovered to eliminate the gap between the webbing and the human body, thereby improving collision safety. In addition, the motor can be reused and will not produce pungent gas compared to traditional solutions, thus providing a better user experience and at a relatively low cost.

[0038] Preferred embodiments of the present invention are:

[0039] like Figure 2 As shown, an exploded view of the comfortable electric end plate pretensioner of a car seat belt; the basic implementation mechanism of the comfortable electric end plate pretensioner of the car seat belt includes a coil spring cover 1, a limit plate 1.1, a fixing structure 1.2, a coil spring 2, a coil spring claw Ⅰ2.1, a coil spring claw Ⅱ2.2, a coil spring plate 3, a support frame 4, a support frame limit hole 4.1, a support frame upper end 4.2, a coil spring fixing hole 4.3, a reel 5, a reel winding claw 5.1, a reel one-way meshing device 5.2, a reel limit column 5.3, a webbing 6, a webbing lead-out end 6.1, a transition gear 7, a gear claw 7.1, a gear one-way meshing device 7.2, a motor 8, a motor gear 8.1, a bushing 9, a webbing guide sleeve 10, a webbing lead-out groove 10.1 and other parts.

[0040] One end of the webbing 6 is fixed in the groove of the reel 5, the webbing 6 is wound around the axis of the reel 5, the webbing lead-out end 6.1 is led out from the webbing lead-out groove 10.1 of the webbing guide sleeve 10, the reel 5 can rotate freely, the reel winding claw 5.1 at one end of the reel 5 is connected with the reel clamping claw II2.2 of the reel spring 2, the reel 5 can wind the reel spring 2, the tightened reel spring 2 can drive the reel 5 to rotate, the reel one-way meshing device 5.2 at the other end of the reel 5 is meshed with the gear single meshing device 7.2 of the transition gear 7, the gear claw 7.1 is meshed with the motor gear 8.1 of the motor 8, the bushing 9 is installed in the support frame limit 4.1 of the support frame 4, and the reel 5 is constrained in the hole of the bushing 9 by the reel limit column 5.3.

[0041] like Figures 3 to 5 As shown, the internal coordination diagram of the electric end plate pretensioner for the comfort of the automobile seat belt; the coil spring claw II 2.2 of the coil spring 2 is connected to the winding claw 5.1 of the reel, and the coil spring claw I 2.1 of the coil spring 2 is connected to the limit plate 1.1 of the coil spring cover 1. The coil spring 2 can be pre-wound with the corresponding number of turns so as to have the driving force to drive the reel 5 to rotate. The reel 5 can recycle the webbing 6 when rotating. The reel one-way meshing device 5.2 and the gear one-way meshing device 7.2 are one-way meshing. The reel is driven by the coil spring 2. When the shaft 5 rotates, the reel one-way meshing device 5.2 rotates clockwise without driving the gear one-way meshing device 7.2 to rotate, making it easier to recycle the webbing and reducing the pressure on the driver and passengers. The motor 8 drives the motor gear 8.1 to rotate counterclockwise, and the motor gear 8.1 drives the gear claw 7.1 to rotate clockwise. The one-way meshing device 7.2 drives the reel 5 to rotate to achieve webbing recycle. The webbing lead-out end 6.1 can be manually pulled out to pull out the webbing wound on the reel 5. Figure 6 Working diagram of the electric end-piece pretensioner for the comfort of the car seat belt: Under normal wearing conditions, the webbing on the abdomen of the driver and passenger drives the reel 5 to retract the webbing through the coil spring 2, eliminating the slack webbing and making the webbing fit the human body better. When the driver and passenger leans forward to take something or moves the body to relax, the movement of the abdomen can pull out the webbing wrapped around the reel 5;

[0042] In the event of a collision, the motor gear 8.1 of the motor 8 drives the transition gear 7 to rotate, and the transition gear 7 drives the reel 5 to rotate. The reel 5 recycles the webbing, eliminating the gap between the webbing and the human body, which can better restrain the human body and actively improve the safety performance. In addition, the webbing recovered by the motor 8 can be reused, and compared with the gunpowder-type end-piece pretensioner, it does not produce pungent gas and has a relatively low cost.

[0043] To sum up, the purpose of the patent of this invention is to provide a comfortable electric end plate pretensioner for a car seat belt. When it is worn normally, the webbing fits the human body and is more comfortable to wear. When the driver or passenger leans over to take something or moves the body to relax, the webbing can be pulled out, making it more convenient and comfortable to wear. In the event of a collision, the webbing can be recycled to eliminate the gap between the webbing and the human body, thereby improving collision safety. In addition, the motor can be reused and will not produce pungent gas, providing a better user experience.

[0044] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0045] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An automobile safety belt end plate pretensioner, comprising a support frame, a reel, a coil spring structure and a webbing, wherein the reel is arranged on the support frame, the webbing is wound on the reel, and one end of the reel is connected to the coil spring structure arranged on the support frame, characterized in that: It also includes a motor and a transition wheel. The motor is arranged on a support frame. The output end of the motor is connected to the transition wheel. The transition wheel is arranged on the other end of the reel through a one-way clutch.

2. The vehicle safety belt end plate pretensioner according to claim 1, characterized in that: The transition wheel is a transition gear, and the output end of the motor is provided with a motor gear, and the motor gear and the transition gear are meshed.

3. The vehicle safety belt end plate pretensioner according to claim 1 or 2, characterized in that: A reel one-way meshing device is arranged on the other end of the reel, and a gear one-way meshing device corresponding to the reel one-way meshing device is arranged in the shaft hole of the transition wheel.

4. The vehicle safety belt end plate pretensioner according to claim 1, characterized in that: The support frame includes a mounting plate and a pair of ear plates arranged on the mounting plate. One end of the reel passes through an ear plate and is connected to a coil spring structure located outside the ear plate. The other end of the reel is arranged on the other ear plate through a bushing. The webbing is located between the pair of ear plates, and the motor is fixed on the mounting plate.

5. The vehicle safety belt end plate pretensioner according to claim 4, characterized in that: The transition wheel is located between a pair of ear plates.

6. The vehicle safety belt end plate pretensioner according to claim 4, characterized in that: A webbing guide sleeve is provided at the upper end of the mounting plate between a pair of ear plates, and a webbing lead-out groove for leading out a webbing lead-out end is provided on the webbing guide sleeve.

7. The vehicle safety belt end plate pretensioner according to claim 4, characterized in that: The coil spring structure comprises a coil spring and a coil spring cover, wherein the coil spring is located inside the coil spring cover, the coil spring cover is fixed to the outside of an ear plate, and the inner end of the coil spring is connected to one end of the winding shaft through a claw structure.

8. The vehicle safety belt end plate pretensioner according to claim 4, characterized in that: A limiting piece is arranged inside the coil spring cover, and the outer end of the coil spring is hung on the limiting piece.

9. The vehicle safety belt end plate pretensioner according to claim 7, characterized in that: The clamping claw structure comprises a coil spring clamping claw arranged at the inner end of the coil spring and a reel winding claw arranged on one end of the reel, and the coil spring clamping claw and the reel winding claw are matched with each other.

10. The vehicle safety belt end plate pretensioner according to any one of claims 1 to 9, characterized in that: The coil spring of the coil spring structure is pre-wound with a corresponding number of turns to have an initial driving force setting.

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