Retractor

Abstract

The utility model provides a retractor, which belongs to the technical field of safety belt retractors and comprises a support, a rotating shaft, a winding drum, a ratchet wheel, a pawl, a coil spring and a locking spring. The rotating shaft is rotationally installed on the support, the winding drum and the ratchet wheel are both installed on the rotating shaft in a sleeved mode, the axial end of the winding drum is provided with an insertion block, an inner hole of the ratchet wheel is provided with an anti-rotation edge matched with the rotating shaft, the side face of the ratchet wheel is provided with an insertion groove matched with the insertion block in an inserted mode, the pawl is rotationally installed on the support and matched with the ratchet wheel, and the coil spring is installed between the rotating shaft and the support. And the locking spring is arranged between the pawl and the bracket. According to the retractor provided by the utility model, the ratchet wheel is detachably connected with the winding drum and the rotating shaft, so that the ratchet wheel can be separated from the rotating shaft and the winding drum only by pulling the ratchet wheel outwards in the axial direction of the rotating shaft, and the convenience of dismounting and mounting the ratchet wheel is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat belt retractors, and more specifically relates to a retractor. Background Art

[0002] The seat belt is the most important protective device on a car. When a vehicle collides, it can avoid or reduce the risk of secondary collisions between the driver and the objects in the car or being thrown out of the car directly. The core component of the seat belt is the reel. In the existing reel, a coil spring is usually set at one end of the reel, and a ratchet and pawl mechanism is installed at the other end of the reel. When the seat belt is pulled out, it will drive the reel to rotate, thereby driving the coil spring connected to it to rotate in the same direction, causing the coil spring to reverse twist; when the seat belt is loosened, the coil spring will twist in the opposite direction to restore its original state, thereby driving the reel connected to it to rotate in the opposite direction, and the seat belt webbing will be wound onto the reel, thereby tightening the seat belt webbing. The ratchet and pawl mechanism is used to prevent the seat belt from tightening during normal operation. The ratchet of the existing reel is usually fixed to the reel by welding, which makes it inconvenient to disassemble and repair the ratchet. Utility Model Content

[0003] The utility model aims to provide a retractor, aiming to solve the problem that the ratchet wheel of the existing retractor is inconvenient to disassemble and repair.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a retractor, including: a bracket, a rotating shaft, a reel, a ratchet, a pawl, a coil spring and a locking spring; the rotating shaft is rotatably mounted on the bracket, the reel and the ratchet are both mounted on the rotating shaft, an insertion block is provided at the axial end of the reel, the inner hole of the ratchet is provided with an anti-rotation edge matching the rotating shaft, a slot is provided on the side of the ratchet for plugging and cooperating with the insertion block, the pawl is rotatably mounted on the bracket and installed in cooperation with the ratchet, the coil spring is installed between the rotating shaft and the bracket, and the locking spring is between the pawl and the bracket.

[0005] In a possible implementation, a mounting hole for the pawl to pass through is formed on the side wall of the bracket.

[0006] In a possible implementation, there are two ratchets, which are respectively located at two ends of the axial direction of the reel.

[0007] In a possible implementation, a shield is installed on the outer side wall of the bracket, the coil spring is located inside the shield, and a receiving cavity for receiving one free end of the coil spring is provided inside the shield.

[0008] In a possible implementation, a slot for accommodating the other free end of the coil spring is formed at the axial end of the rotating shaft.

[0009] In a possible implementation, the bracket is a U-shaped structure, and a crossbeam is installed at an open end of the U-shaped structure.

[0010] In a possible implementation manner, reinforcing ribs are provided on the crossbeam.

[0011] In a possible implementation, a top cover is detachably mounted on the top of the bracket.

[0012] In a possible implementation, an elastic force arm is provided at the bottom of the top cover, the elastic force arm is located on the inner side of the bracket, a conical clamping block is provided at the bottom of the elastic force arm, and a corresponding clamping groove that engages with the conical clamping block is provided on the side wall of the bracket.

[0013] In a possible implementation, a support arm is provided at one end of the pawl away from the ratchet, and the support arm is located outside the bracket. A pull wire is also installed on the bracket, and one end of the pull wire is connected to the support arm.

[0014] Compared with the prior art, the scheme shown in the embodiment of the present application is a retractor of the utility model, in which the reel and the ratchet are both mounted on a rotating shaft. An insert block is provided at the axial end of the reel, and the insert block is plugged into and matched with a slot on the side of the ratchet, thereby realizing the synchronous rotation of the reel and the ratchet. The inner hole of the ratchet is provided with an anti-rotation edge that matches the rotating shaft, thereby realizing the synchronous rotation of the rotating shaft and the ratchet. Since the ratchet is detachably connected to the reel and the rotating shaft, the ratchet can be separated from the rotating shaft and the reel by simply pulling the ratchet outward along the axial direction of the rotating shaft, which greatly improves the convenience of disassembling and assembling the ratchet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a retractor provided in an embodiment of the utility model;

[0017] Figure 2 An exploded diagram of a retractor provided in an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the three-dimensional structure of a bracket provided in an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the assembly structure of the protective cover and the coil spring provided in an embodiment of the utility model;

[0020] Figure 5 A schematic diagram of the three-dimensional structure of a top cover provided in an embodiment of the utility model.

[0021] In the figure: 1, bracket; 101, rotating shaft; 102, reel; 103, ratchet; 104, pawl; 105, coil spring; 106, locking spring; 107, plug block; 108, anti-rotation edge; 109, slot; 110, mounting hole; 111, shield; 112, accommodating cavity; 113, slot; 114, crossbeam; 115, reinforcing rib; 116, top cover; 117, elastic force arm; 118, conical block; 119, slot; 120, support arm; 121, pull wire. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Please also read Figures 1 to 3 Now, a retractor provided by the utility model is described. The retractor comprises: a bracket 1, a rotating shaft 101, a reel 102, a ratchet 103, a pawl 104, a coil spring 105 and a locking spring 106; the rotating shaft 101 is rotatably mounted on the bracket 1, the reel 102 and the ratchet 103 are both mounted on the rotating shaft 101, an insert block 107 is provided at the axial end of the reel 102, an anti-rotation edge 108 matching the rotating shaft 101 is provided at the inner hole of the ratchet 103, a slot 109 plugged with the insert block 107 is provided on the side of the ratchet 103, the pawl 104 is rotatably mounted on the bracket 1 and mounted in cooperation with the ratchet 103, the coil spring 105 is installed between the rotating shaft 101 and the bracket 1, and the locking spring 106 is between the pawl 104 and the bracket 1.

[0024] Compared with the prior art, the reel provided in this embodiment has a reel 102 and a ratchet 103 both mounted on a rotating shaft 101. An insert block 107 is provided at the axial end of the reel 102, and the insert block 107 is plugged into a slot 109 on the side of the ratchet 103, thereby realizing the synchronous rotation of the reel 102 and the ratchet 103. The inner hole of the ratchet 103 is provided with an anti-rotation edge 108 matching the rotating shaft 101, thereby realizing the synchronous rotation of the rotating shaft 101 and the ratchet 103. Since the ratchet 103 is detachably connected to the reel 102 and the rotating shaft 101, the ratchet 103 can be separated from the rotating shaft 101 and the reel 102 by simply pulling the ratchet 103 outward along the axial direction of the rotating shaft 101, which greatly improves the convenience of disassembling and assembling the ratchet 103.

[0025] In this embodiment, the ratchet 103, the pawl 104 and the locking spring 106 constitute a ratchet 103-pawl 104 mechanism, thereby realizing the unidirectional rotation of the reel 102 in the working state. One end of the pawl 104 extends to the outside of the bracket 1, and the locking spring 106 is located outside the bracket 1, and the two ends of the locking spring 106 hook the pawl 104 and the bracket 1 respectively.

[0026] In some embodiments, see Figure 2 and Figure 3 , a mounting hole 110 for the ratchet 104 to pass through is provided on the side wall of the bracket 1. In this embodiment, a movable space for the ratchet 104 to rotate is provided on the two opposite side walls of the bracket 1. A mounting hole 110 is provided on the side wall of the bracket 1, and the mounting hole 110 is connected to the above movable space. When the ratchet 104 and the mounting hole 110 are aligned, the ratchet 104 can be disassembled and assembled. When the ratchet 104 is in the working state, the ratchet 104 and the mounting hole 110 are staggered with each other, thereby preventing the ratchet 104 from falling off during operation.

[0027] In some embodiments, see Figure 2 The number of ratchets 103 is two, and they are respectively located at the two ends of the axial direction of the reel 102. In this embodiment, the two ratchets 103 are respectively located at the two ends of the axial direction of the reel 102. The two ratchets 103 are both located on the inner side of the bracket 1. The two ratchets 103 are both provided with an insert block 107, and at least one of the ratchets 103 is provided with an anti-rotation edge 108.

[0028] In some embodiments, see Figure 2 and Figure 4, a shield 111 is installed on the outer wall of the bracket 1, and the coil spring 105 is located inside the shield 111. A receiving cavity 112 for receiving one of the free ends of the coil spring 105 is provided inside the shield 111. In this embodiment, the coil spring 105 is located outside the bracket 1, and the coil spring 105 is sleeved on the rotating shaft 101. The shield 111 is fixed to the outer wall of the bracket 1 by screws. The shield 111 covers the coil spring 105 inside, which plays a protective role for the coil spring 105. The free end of the outer ring of the coil spring 105 is located in the receiving cavity 112, so as to fix the free end of the outer ring of the coil spring 105.

[0029] In some embodiments, see Figure 2 and Figure 3 The axial end of the rotating shaft 101 is provided with a slot 113 for accommodating the other free end of the coil spring 105. In this embodiment, the slot 113 is provided on the axial end face of the rotating shaft 101, and the slot 113 is located at the center of the rotating shaft 101 and runs through the entire rotating shaft 101. The free end of the inner ring of the coil spring 105 is located in the slot 113, so that the free end of the inner ring of the coil spring 105 is fixed.

[0030] In some embodiments, see Figure 2 , the bracket 1 is a U-shaped structure, and a crossbeam 114 is installed at the open end of the U-shaped structure. In this embodiment, the bracket 1 is a U-shaped structure, and the crossbeam 114 is used to connect the two vertical walls opposite to the open end of the U-shaped structure, so that the structure of the bracket 1 is more solid. The bottom surfaces of the two opposite side walls of the bracket 1 are provided with grooves for installing the crossbeam 114. The crossbeam 114 is fixed to the bracket 1 by welding.

[0031] In some embodiments, see Figure 2 , a reinforcing rib 115 is provided on the cross beam 114. In this embodiment, the cross beam 114 is a sheet metal part, and the reinforcing rib 115 is provided along the length direction of the cross beam 114. The reinforcing rib 115 is integrally formed with the cross beam 114 by stamping. The reinforcing rib 115 can improve the structural strength of the cross beam 114 and prevent the cross beam 114 from bending and deformation.

[0032] In some embodiments, see Figure 2 A top cover 116 is detachably mounted on the top of the bracket 1. In this embodiment, the top cover 116 is detachably mounted on the top of the bracket 1 to shield the movable parts (reel 102, ratchet 103 and pawl 104) inside the bracket 1, thereby preventing the operator from accidentally touching the movable parts inside the bracket 1.

[0033] In some embodiments, see Figure 3 and Figure 5, an elastic force arm 117 is provided at the bottom of the top cover 116, and the elastic force arm 117 is located on the inner side of the bracket 1. A conical block 118 is provided at the bottom of the elastic force arm 117, and a slot 119 that is engaged with the conical block 118 is provided on the side wall of the bracket 1. In this embodiment, there are three elastic force arms 117, which are evenly arranged along the outer contour of the top cover 116. The elastic force arm 117 is located on the inner side of the bracket 1. A conical block 118 is provided at the bottom of the elastic force arm 117. The top cover 116 is detachably connected to the bracket 1 through the engagement of the conical block 118 with the slot 119. When the top cover 116 needs to be disassembled, a force is applied to the conical block 118, and the elastic force arm 117 is elastically deformed, and finally the conical block 118 is disengaged from the slot 119, and the top cover 116 can be removed from the bracket 1.

[0034] In some embodiments, see Figure 1 , a support arm 120 is provided at one end of the pawl 104 away from the ratchet 103, and the support arm 120 is located on the outside of the bracket 1. A pull wire 121 is also installed on the bracket 1, and one end of the pull wire 121 is connected to the support arm 120. In this embodiment, the support arm 120 and the pawl 104 are integrally formed. The support arm 120 is located at the end of the pawl 104 away from the ratchet 103 and is located on the outside of the bracket 1. Since one end of the pull wire 121 is connected to the support arm 120, the pawl 104 is driven to rotate by pulling the pull wire 121, and the pawl 104 is then disengaged from the ratchet 103, thereby manually unlocking the ratchet 103, and automatically winding the safety belt under the elastic force of the coil spring 105.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A retractor, characterized in that: include: A bracket, a rotating shaft, a reel, a ratchet, a pawl, a coil spring and a locking spring; the rotating shaft is rotatably mounted on the bracket, the reel and the ratchet are both mounted on the rotating shaft, an insert block is provided at the axial end of the reel, the inner hole of the ratchet is provided with an anti-rotation edge matching the rotating shaft, a slot is provided on the side of the ratchet for plugging and cooperating with the insert block, the pawl is rotatably mounted on the bracket and mounted in cooperation with the ratchet, the coil spring is installed between the rotating shaft and the bracket, and the locking spring is between the pawl and the bracket.

2. A retractor as claimed in claim 1, characterized in that: A mounting hole for the ratchet to pass through is provided on the side wall of the bracket.

3. A retractor as claimed in claim 1, characterized in that: There are two ratchets, which are respectively located at two ends of the axial direction of the reel.

4. A retractor as claimed in claim 1, characterized in that: A shield is installed on the outer side wall of the bracket, the coil spring is located inside the shield, and a receiving cavity for receiving one free end of the coil spring is provided inside the shield.

5. A retractor as claimed in claim 4, characterized in that: A slot for accommodating the other free end of the coil spring is formed at the axial end of the rotating shaft.

6. A retractor as claimed in claim 1, characterized in that: The bracket is a U-shaped structure, and a crossbeam is installed at the open end of the U-shaped structure.

7. A retractor as claimed in claim 6, characterized in that: The crossbeam is provided with reinforcing ribs.

8. A retractor as claimed in claim 1, characterized in that: A top cover is detachably mounted on the top of the bracket.

9. A retractor as claimed in claim 8, characterized in that: An elastic force arm is provided at the bottom of the top cover, and the elastic force arm is located on the inner side of the bracket. A conical clamping block is provided at the bottom of the elastic force arm, and a clamping groove that is clamped and matched with the conical clamping block is correspondingly provided on the side wall of the bracket.

10. A retractor as claimed in claim 1, characterized in that: A support arm is provided at one end of the pawl away from the ratchet wheel. The support arm is located outside the bracket. A pull wire is also installed on the bracket, and one end of the pull wire is connected to the support arm.

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