CN203157930U - Safety belt retractor - Google Patents

Abstract

The utility model provides a safety belt retractor, the reel includes a reel, a torsion bar, a reel cover, a reel ring and a connecting piece, the torsion bar is located in the through hole of the reel, and the end part is provided with a threaded hole The winding part, the rod part, the locking part that is sleeved on the reel gland and forms a non-rotation connection with it, and the first limiting part that presses the reel gland on one end of the reel; the reel collar includes the first , the second collar, and the second collar through the first and second collars, the second collar is sleeved in the through hole and forms an anti-rotation connection with the reel; the winding part is sleeved in the second collar inside and form an anti-rotation connection with it; the connecting piece includes a second limiting part and a threaded joint that penetrates into the second sleeve hole and engages with the threaded hole; the second limiting part compresses the first collar on the other end of the reel . The connection between the parts of the reel of the utility model will not be loosened, and can avoid damage to the occupant's chest caused by heavy loads.

Description

A safety belt retractor

technical field

The utility model belongs to the field of safety belts, in particular to a safety belt retractor. the

Background technique

The reel of the seat belt retractor mainly includes a reel for winding the webbing, a torsion bar located in the reel, and a connecting part connecting the torsion bar to the reel. Currently, the torsion bar is connected to the reel The method is usually to make the reel, torsion bar and connecting parts into a whole through interference fit, and prevent the axial movement of each part of the reel. However, after long-term use of this connection method, there may be slight looseness. With the accumulation of time, the looseness will have a greater impact on the components, until the components of the reel visibly move in the axial direction, which will affect the The normal use of seat belts brings safety hazards to passengers. the

Contents of the invention

The utility model solves the technical problem that the parts of the reel are prone to move in the axial direction, and provides a safety belt retractor which reliably connects the torsion bar to the reel to prevent the parts of the reel from moving in the axial direction. the

In order to achieve the above purpose, the utility model provides a safety belt retractor, which includes a bracket, a reel, a coil spring, and a self-locking device. , the reel is used to wind the webbing of the safety belt, and a through hole is arranged inside; the torsion bar is located in the through hole, and includes a winding part, a rod part, a locking part, and a first limiting part fixedly connected in sequence. The end of the winding part is provided with a threaded hole; the reel gland is provided with a first set of holes, and the locking part is sleeved in the first set of holes and forms an anti-rotation connection with the reel gland. The first limiting part presses the reel gland on one end of the reel along the axial direction of the reel; the self-locking device is arranged between the reel gland and the reel; the reel collar includes a fixedly connected first A collar, a second collar, and a second collar passing through the first and second collars, the second collar is sleeved in the through hole and forms an anti-rotation connection with the reel; the winding The part is sleeved in the second sleeve hole and forms an anti-rotation connection with the reel collar; the connecting piece includes a coil spring connecting part, a second limiting part, and a threaded joint that are fixedly connected in sequence; the threaded joint penetrates into the The second sleeve hole is engaged with the thread of the threaded hole, and the second stopper presses the first collar on the other end of the reel along the axial direction of the reel; the preload direction of the coil spring is consistent with the tightening direction of the threaded joint . the

Preferably, the first and second limiting parts are circular rings respectively arranged in the radial direction of the torsion bar and the connecting piece. the

Preferably, the first and second limiting parts are a ring of discontinuous protrusions respectively arranged in the radial direction of the torsion bar and the connecting piece. the

Preferably, the locking part and the reel cover, the second collar and the reel, and the winding part and the reel collar are polyhedral structures that cooperate with each other. the

Preferably, the end of the first collar is provided with a counterbore for accommodating the second limiting part. the

Preferably, the scroll gland further includes a gland body and a protruding cylinder, the first set of holes passes through the gland body and the protruding cylinder, and the protruding cylinder can be inserted into the through hole and rotate freely. the

Preferably, the gap between the protruding cylinder and the inner wall of the through hole is 0.05-0.2mm. the

Preferably, the reel and the cover body are provided with positioning pins and positioning holes that cooperate with each other, and the positioning pins can be inserted into the positioning holes. the

The beneficial effect of the utility model is: since the torsion bar presses the reel gland on one end of the reel through the first limiting part, the connecting piece and the torsion bar are screwed together and the reel collar is pressed through the second limiting part At the other end of the reel, so that the connection between the various parts of the reel will not become loose. When braking in an emergency, the self-locking device locks the reel gland, and at this time the torsion bar and the reel are all fixed. However, due to inertia, when the load of the webbing on the passenger reaches a certain value, that is, when the webbing generates a certain torque on the reel, the reel drives the winding part to rotate, and the reel gland keeps the locking part stationary, causing the torsion bar to twist and deform , In this way, a small amount of webbing is released from the reel, so as to avoid the damage to the occupant's chest caused by the large load. the

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a safety belt retractor provided by the utility model. the

Fig. 2 is an exploded view of the reel provided by the utility model. the

Fig. 3 is a longitudinal sectional view of the reel of the present invention. the

Marked in the picture:

2-reel, 21-body part, 22-first disc part, 23-second disc part, 24-through hole,

3-torsion bar, 31-winding part, 311-threaded hole, 32-rod part, 33-locking part, 34-first limit part,

4-reel gland, 41-gland body, 411-positioning hole, 42-protruding cylinder, 43-first set of holes, 44-groove,

5-spool collar, 51-first collar, 511-counterbore, 52-second collar, 53-second set of holes,

6-connector, 61-coil spring connection part, 62-second limit part, 63-threaded joint,

7-Bracket,

8-coil spring,

9- Self-locking device.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. the

Referring to Figures 1-4, a safety belt retractor includes a bracket 7, a reel, a coil spring 8, and a self-locking device 9, and the reel includes a reel 2, a torsion bar 3, a reel gland 4, and a reel collar 5 , and connector 6. The reel 2 is used for winding the webbing, and a through hole 24 is provided inside it. The torsion bar 3 is located in the through hole 24 of the reel 2, and includes a winding portion 31, a rod portion 32, a locking portion 33, and a first limiting portion 34 fixedly connected in sequence. The end of the winding portion 31 Threaded holes 311 are provided. The reel gland 4 is provided with a first sleeve hole 43, the locking portion 33 is sleeved in the first sleeve hole 43 and forms a rotation-proof connection with the reel gland 4, and the first limiting portion 34 is The cylinder 2 axially compresses the reel gland 4 on one end of the reel 2 ; the self-locking device 9 is arranged between the reel gland 4 and the bracket 7 . The reel collar 5 includes a first collar 51 and a second collar 52 fixedly connected, and a second collar 53 passing through the first and second collars 52, and the second collar 52 is sleeved on the roll The through hole 24 of the barrel 2 forms an anti-rotation connection with the reel 2 ; the winding portion 31 is sleeved in the second sleeve hole 53 and forms an anti-rotation connection with the reel collar 5 . The connecting piece 6 includes a coil spring connecting portion 61 , a second limiting portion 62 , and a threaded joint 63 fixedly connected in sequence; the threaded joint 63 penetrates into the second sleeve hole 53 and engages with the threads of the threaded hole 311 , the second limiting portion 62 compresses the first collar 51 on the other end of the reel 2 along the axial direction of the reel 2; the

Referring to FIG. 2 , the reel 2 includes a body portion 21 and first and second disk portions 22, 23 located at both ends of the body portion 21. The outer diameters of the first and second disk portions 22, 23 are larger than the outer diameter of the body portion 21. diameter, the webbing is wound on the body part 21. the

The rod portion 32 of the torsion bar 3 is located between the winding portion 31 and the locking portion 33 for torsion deformation. the

The first limiting part 34 can be a circular ring (such as this embodiment) or a circle of discontinuous protrusions arranged in the radial direction of the torsion bar 3, and the first limiting part 34 cooperates with the end surface of the reel 2 to fix and clamp the reel Gland 4. the

Similarly, the second limiting portion 62 can also be a circular ring (as in this embodiment) or a circle of discontinuous protrusions arranged in the radial direction of the connecting member 6, and the second limiting portion 62 is matched with the other end surface of the reel 2 To securely clamp the reel collar 5. the

The anti-rotation connection between the locking part 33 and the reel gland 4 described in the utility model, the anti-rotation connection between the second collar 52 and the reel 2, and the connection between the winding part 31 and the reel collar 5 The anti-rotation connection refers to the non-rotatable connection between two parts. In this embodiment, the rotation between the two parts is prevented through the polyhedral structure that cooperates with each other. For example, the locking portion 33 of the torsion bar 3 is a hexahedral columnar structure, and the first sleeve hole 43 of the reel gland 4 matched with it is a hexahedral hole; the second collar 52 is a hexahedral columnar structure, and the matching The through hole 24 of the reel 2 is a hexagonal hole, or the through hole 24 only forms a hexagonal hole at one end close to the second collar 52, and forms a round hole at other positions; the winding portion 31 of the torsion bar 3 is a hexahedral Columnar structure, the second set hole 53 of the reel collar 5 matched with it is a hexagonal hole. Of course, the number of faces of the polyhedron structure of the locking portion 33 , the second collar 52 , and the winding portion 31 may be different. the

In this embodiment, the reel gland 4 includes a gland body 41, a protruding cylinder 42 functioning as a guide post, and a first sleeve hole 43. The protruding cylinder 42 is provided on the side of the gland body 41 facing the reel 2, and The first set of holes 43 runs through the protruding cylinder 42 and the gland body 41 . The outer diameter of the protruding cylinder 42 is smaller than the diameter of the through hole 24 of the reel 2, so that the protruding cylinder 42 can be inserted into the through hole 24 of the reel 2 with a gap of 0.05-0.2 mm. Referring to Fig. 2, on the first disc part 22 and the gland body 41, there are also positioning pins and positioning holes 411 that cooperate with each other. In this embodiment, the positioning pins are located on the first disc part 22, and the positioning holes 411 Set on the gland body 41 . The design of 42, positioning pin and positioning hole 411 can make the reel gland 4 roughly positioned on the reel 2 when the safety belt retractor is installed. Of course, the positions of the positioning pin and the positioning hole 411 can be interchanged. the

Referring to FIG. 2 , in this embodiment, the first collar 51 and the second collar 52 of the reel collar 5 are integrally formed. the

The end of the first collar 51 is provided with a counterbore 511 for accommodating the second limiting portion 62 . the

The coil spring connecting part 61 of the connecting piece 6 is used to connect with the coil spring 8, and the pretightening force of the coil spring 8 is transmitted to the reel 2 through the connecting piece 6, so the pretightening direction of the coil spring 8 should be consistent with the tightening direction of the threaded joint 63 , so as to ensure that the threaded joint 63 of the connector 6 and the threaded hole 311 of the winding portion 31 are always in a tightened state. the

Referring to Fig. 3, the installation process of the safety belt retractor of the present invention is described below. First, the reel 2 is loaded into the bracket 7, and then the protruding cylinder 42 of the reel gland 4 is inserted into the through hole 24 of the reel 2, Simultaneously, the positioning pin on the first disc portion 22 is inserted in the positioning hole 411 of the reel gland 4, and the self-locking device 9 is set between the reel gland 4 and the support 7 simultaneously, and the self-locking device 9 can be contained in the reel gland. 4 in the groove 44, and when it needs to be locked, the teeth on it mesh with the teeth on the bracket 7 to lock the reel gland 4, so that the reel gland 4 is roughly fixed on the reel 2. Then, the winding portion 31 of the torsion bar 3 passes through the reel gland 4 and the reel 2 in sequence until the first limit portion 34 contacts the reel gland 4 and presses the reel gland 4 on the first position of the reel 2 . on the disk part 22. At the second disc portion 23 of the reel 2 , insert the second collar 52 of the reel collar 5 into the through hole 24 of the reel 2 until the first collar 51 abuts against the second disc portion 23 . Then the threaded joint 63 of the connecting piece 6 is inserted into the second sleeve hole 53 and screwed into the threaded hole 311 of the torsion bar 3 until the second limiting portion 62 presses the reel collar 5 onto the reel 2 . Wind the webbing on the reel 2 again. Finally, an upper coil spring 8 is installed on the connector 6 . the

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models. the

Claims (8)

1. A safety belt retractor, comprising a bracket (7), a reel, a coil spring (8), and a self-locking device (9), characterized in that the reel includes: The reel (2), used for winding the webbing of the safety belt, has a through hole (24) inside; The torsion bar (3), located in the through hole (24), includes a winding portion (31), a rod portion (32), a locking portion (33), and a first limiting portion (34) fixedly connected in sequence, so that The end of the winding part (31) is provided with a threaded hole (311); The reel gland (4) is provided with a first set of holes (43), the locking part (33) is sleeved in the first set of holes (43) and forms an anti-rotation connection with the reel gland (4). The first limiting part (34) compresses the reel gland (4) on one end of the reel (2) along the axial direction of the reel (2); the self-locking device (9) is arranged on the reel gland ( 4) Between the reel (2); The reel collar (5), including a first collar (51) and a second collar (52) fixedly connected, and a second collar (53) passing through the first and second collars (52), the The second collar (52) is sleeved in the through hole (24) and forms an anti-rotation connection with the reel (2); the winding part (31) is sleeved in the second sleeve hole (53) and form an anti-rotation connection with the reel collar (5); and The connecting piece (6) includes a coil spring connecting part (61), a second limiting part (62), and a threaded joint (63) fixedly connected in sequence; the threaded joint (63) penetrates into the second set of holes (53) and engaged with the threads of the threaded hole (311), the second stopper (62) compresses the first collar (51) on the other end of the reel (2) along the axial direction of the reel (2); The pre-tightening direction of the coil spring (8) is consistent with the tightening direction of the threaded joint (63). 2. The safety belt retractor according to claim 1, characterized in that: the first and second limiting parts (34, 62) are respectively arranged on the diameter of the torsion bar (3) and the connecting piece (6). Up ring. 3. The seat belt retractor according to claim 1, characterized in that: the first and second limiting parts (34, 62) are respectively arranged on the diameter of the torsion bar (3) and the connecting piece (6). An upward circle of discontinuous bulges. 4. The seat belt retractor according to claim 1, characterized in that: the locking part (33) and the reel gland (4), the second collar (52) and the reel (2) , and the winding portion (31) and the reel collar (5) are polyhedral structures that cooperate with each other. 5. The seat belt retractor according to claim 1, characterized in that: the end of the first collar (51) is provided with a counterbore (511) for accommodating the second limiting portion (62). 6. The seat belt retractor according to claim 1, characterized in that: the reel gland (4) further comprises a gland body (41) and a protruding cylinder (42), and the first set of holes (43 ) through the gland body (41) and the protruding cylinder (42), and the protruding cylinder (42) can be inserted into the through hole (24) to rotate freely. 7. The seat belt retractor according to claim 6, characterized in that: the gap between the protruding cylinder (42) and the inner wall of the through hole (24) is 0.05-0.2mm. 8. The seat belt retractor according to claim 6, characterized in that: the reel (2) and the cover body (41) are provided with positioning pins and positioning holes (411) that cooperate with each other, and the positioning pins Can be inserted into the positioning hole.

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