CN111873938B - Two-stage force limiting mandrel and retractor - Google Patents
Two-stage force limiting mandrel and retractor Download PDFInfo
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- CN111873938B CN111873938B CN202010748684.9A CN202010748684A CN111873938B CN 111873938 B CN111873938 B CN 111873938B CN 202010748684 A CN202010748684 A CN 202010748684A CN 111873938 B CN111873938 B CN 111873938B
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- force limiting
- limiting
- mandrel
- force
- mandrel body
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 251
- 210000000078 claw Anatomy 0.000 claims description 48
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000004308 accommodation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 206010008469 Chest discomfort Diseases 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
Abstract
The application discloses a secondary force limiting mandrel and a retractor, wherein the secondary force limiting mandrel comprises a mandrel body, a lockable shaft head, a fixed block, a force limiting torsion spring, a force limiting rod and a limiting structure; one end of the force limiting rod is limited in the first accommodating groove of the mandrel body, and the other end of the force limiting rod is limited in the limiting groove of the lockable shaft head; the fixed block is inserted into a second accommodating groove at the end part of the mandrel body; the force limiting torsion spring is fixed on the lockable shaft head through a limiting structure and is abutted with the fixed block; when the lockable shaft head is locked, the mandrel body drives the force limiting rod to rotate, and the fixed block is synchronously driven by the mandrel body to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring. The application has the advantages that the structure of each part is simple, each part is assembled on the mandrel body in a clamping or inserting manner, the assembling manner of the multistage force limiting structure and the mandrel body is simplified, the structure based on each part is simple, and the assembly with the mandrel body is simple, so that the cost of manufacturing the mandrel of the retractor is reduced.
Description
Technical Field
The application relates to the technical field of automobile equipment, in particular to a secondary force limiting mandrel and a retractor.
Background
With the rapid development of the automobile manufacturing industry, the requirements of users on the safety performance of automobile safety belts are also increasing.
When the conventional emergency locking safety belt collides, the safety belt webbing can generate larger pressure on the chest of the passenger, so that the chest of the passenger is injured to a certain extent. In order to improve the protection effect, the force limiting safety belt is born. The force limiting safety belt retractor is internally provided with a force limiting rod which can rotate at a specified torque. When a collision occurs, the seat belt retractor is locked, the seat belt webbing stops being pulled out from the retractor, and as the force value acting on the seat belt webbing increases, the torque of the force limiting rod inside the retractor gradually increases. When the torque reaches the actuation torque of the force limiting lever, the force limiting lever begins to rotate at a relatively constant torque. At this point, the retractor no longer limits the pull-out of the seat belt webbing, and the spool rotates with the force limiting lever, and the seat belt webbing is pulled out of the retractor at a relatively constant force value. In this way, the force value acting on the occupant's chest will no longer rise, maintaining the current chest pressure until the end of the collision. The pressure of the chest of the passenger is effectively controlled, so that the protection effect on the passenger is improved.
However, due to the large acting force generated by the collision, the existing force limiting rod may not meet the current protection requirement, and therefore injury is caused to passengers. In order to avoid this, a multi-stage force limiting structure, such as a combination of a plurality of force limiting rods, is provided in the retractor in the prior art. However, when the existing multi-stage force limiting structure is assembled with the mandrel of the retractor, the assembly mode is complex, and the cost of the multi-stage force limiting structure is high, so that mass production is not facilitated.
Therefore, the production of a mandrel of a retractor with a simple structure, which reduces the manufacturing cost, is a problem to be solved by the technicians in the field.
Disclosure of Invention
The embodiment of the application provides a secondary force limiting mandrel, which aims to solve the problems that the structure of a multistage force limiting structure of the mandrel of the existing retractor is complex, the cost is high, and mass production is not facilitated. The embodiment of the application also provides a retractor.
The embodiment of the application provides a secondary force limiting mandrel which is arranged on a retractor and comprises a mandrel body and a lockable shaft head arranged at the end part of the mandrel body, wherein the secondary force limiting mandrel comprises: the device comprises a fixed block, a force limiting torsion spring, a force limiting rod and a limiting structure;
one end of the force limiting rod is limited in a first accommodating groove in the mandrel body, and the other end of the force limiting rod is limited in a limiting groove of the lockable shaft head;
The fixing block is inserted into a second accommodating groove at the end part of the mandrel body and can rotate along with the mandrel body;
The limiting structure is arranged on one side of the lockable shaft head, which faces the mandrel body, and the force limiting torsion spring is fixed on the lockable shaft head through the limiting structure and is abutted with the fixed block;
when the lockable shaft head is locked, the mandrel body drives the force limiting rod to rotate, and the fixed block is synchronously driven by the mandrel body to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring.
Optionally, the lockable shaft head comprises a fixed plate, a locking wheel and a shaft head which are sequentially arranged along the extending direction of the force limiting rod;
the fixing plate is arranged close to the mandrel body;
The shaft head is provided with a protruding structure facing the mandrel body, the protruding structure penetrates through the locking wheel and the fixing plate and is fixed, and the limiting groove is located on the protruding structure;
the limiting structure is arranged on the fixed plate.
Optionally, the fixing block has an arc matching with a circumferential end surface of the fixing plate, including: the fixing protrusion, at least two claw arms and at least one accommodating opening;
the fixing protrusion is arranged at one end of the fixing block, which faces the second accommodating groove, and is inserted into the second accommodating groove at the end part of the mandrel body, in particular, the fixing protrusion is inserted into the second accommodating groove at the end part of the mandrel body;
the at least two claw arms are distributed in sequence along the arc direction of the fixed block, and the extending direction of each claw arm is the same as the axial direction of the lockable shaft head and opposite to the protruding direction of the fixed protrusion;
the accommodating port is formed between the adjacent claw arms;
the force limiting torsion spring is abutted with the claw arm and the accommodating port.
Optionally, the at least two claw arms include three claw arms, and the at least one receiving port includes a first receiving port and a second receiving port;
the tail ends of the three claw arms are respectively attached to the fixed plate;
the first and second receiving openings are formed between adjacent ones of the claw arms.
Optionally, the limiting structure includes a first limiting protrusion and a second limiting protrusion;
the first limiting protrusion is arranged on the circumferential end surface of the inner side of the fixed plate;
The second limiting protrusion is arranged on the side facing the mandrel body and located on the radial end face of the fixing plate.
Optionally, the force limiting torsion spring comprises an integrally formed clamping part and a force limiting part;
The clamping part is clamped with the first limiting protrusion and the second limiting protrusion;
The force limiting part passes through the first accommodating opening along the outward direction and passes through the second accommodating opening along the inward direction after bypassing one claw arm arranged between the first accommodating opening and the second accommodating opening.
Optionally, the clamping part comprises a clamping support body, a first clamping groove and a second clamping groove;
the clamping support body is provided with an radian matched with the fixed plate, and is attached to the circumferential end face of the inner side of the fixed plate;
The first clamping groove is arranged at the tail end of the clamping support body, can be clamped with the first limiting protrusion, and limits the movement of the force limiting torsion spring on the fixed plate along the first direction;
the joint of the clamping part and the force limiting part forms a second clamping groove, and the second clamping groove can be clamped with the second limiting protrusion and limits the movement of the force limiting torsion spring on the fixed plate along a second direction;
The first direction and the second direction are opposite directions.
Optionally, a claw arm disposed between the first accommodating port and the second accommodating port, and an end surface of the claw arm attached to a portion of the force limiting portion is an arc surface.
Optionally, edges of two sides of the plurality of claw arms along the arc direction of the fixed block are arranged to be round-corner structures.
The embodiment of the application also provides a retractor, which comprises a retractor body, and a secondary force limiting mandrel arranged on the retractor body, wherein the retractor comprises a mandrel body and a lockable shaft head arranged at the end part of the mandrel body, and the retractor comprises: the device comprises a fixed block, a force limiting torsion spring, a force limiting rod and a limiting structure;
one end of the force limiting rod is limited in a first accommodating groove in the mandrel body, and the other end of the force limiting rod is limited in a limiting groove of the lockable shaft head;
The fixing block is inserted into a second accommodating groove at the end part of the mandrel body and can rotate along with the mandrel body;
The limiting structure is arranged on one side of the lockable shaft head, which faces the mandrel body, and the force limiting torsion spring is fixed on the lockable shaft head through the limiting structure and is abutted with the fixed block;
when the lockable shaft head is locked, the mandrel body drives the force limiting rod to rotate, and the fixed block is synchronously driven by the mandrel body to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring.
Compared with the prior art, the embodiment of the application has the following advantages:
The embodiment of the application provides a secondary force limiting mandrel which is arranged on a retractor and comprises a mandrel body, a lockable shaft head arranged at the end part of the mandrel body, and further comprises: the device comprises a fixed block, a force limiting torsion spring, a force limiting rod and a limiting structure; one end of the force limiting rod is limited in a first accommodating groove in the mandrel body, and the other end of the force limiting rod is limited in a limiting groove of the lockable shaft head; the fixing block is inserted into a second accommodating groove at the end part of the mandrel body and can rotate along with the mandrel body; the limiting structure is arranged on one side of the lockable shaft head, which faces the mandrel body, and the force limiting torsion spring is fixed on the lockable shaft head through the limiting structure and is abutted with the fixed block; when the lockable shaft head is locked, the mandrel body drives the force limiting rod to rotate, and the fixed block is synchronously driven by the mandrel body to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring. The fixing block, the force limiting torsion spring, the force limiting rod and each part of the limiting structure are simple in structure, each part is assembled on the mandrel body in a clamping or inserting mode, the assembling mode of the multistage force limiting structure and the mandrel body is simplified, the structure based on each part is simple, the assembly with the mandrel body is simple, and therefore the cost of manufacturing the mandrel of the retractor is reduced.
Drawings
Fig. 1 is an exploded view of a secondary force limiting mandrel provided by a first embodiment of the present application.
Fig. 2 is a schematic view of an angle of a secondary force limiting mandrel according to a first embodiment of the present application.
Fig. 3 is a schematic structural view of a part of the structure in the secondary force limiting mandrel according to the first embodiment of the present application.
Fig. 4 is a schematic structural view of a fixing block in a secondary force limiting mandrel according to a first embodiment of the present application.
Fig. 5 is a schematic structural view of a force limiting torsion spring in a secondary force limiting mandrel according to a first embodiment of the present application.
Fig. 6 is a schematic structural view of a limiting structure in a secondary force limiting mandrel according to a first embodiment of the present application.
Reference numerals, a secondary force limiting mandrel 100, a mandrel body 1, a second accommodating groove 11, a lockable shaft head 2, a fixing plate 21, a circumferential end surface 211, a radial end surface 212, a locking wheel 22, a shaft head 23, a protrusion structure 231, a limiting groove 232, a fixing block 4, a fixing protrusion 41, a claw arm 42, a first accommodating opening 43, a second accommodating opening 44, a force limiting torsion spring 5, a clamping part 51, a clamping support 511, a first clamping groove 512, a second clamping groove 513, a force limiting part 52, a force limiting rod 6, a limiting structure 7, a first limiting protrusion 71, a second limiting protrusion 72 and a connecting shaft head 8.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present application may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present application is not limited to the specific embodiments disclosed below.
The first embodiment of the application provides a secondary force limiting mandrel which is arranged on a retractor and is used for limiting the retraction of an automobile safety belt. Fig. 1 is an exploded view of a secondary force limiting mandrel provided by a first embodiment of the present application. Fig. 2 is a schematic view of an angle of a secondary force limiting mandrel according to a first embodiment of the present application. Fig. 3 is a schematic structural view of a part of the structure in the secondary force limiting mandrel according to the first embodiment of the present application. Fig. 4 is a schematic structural view of a fixing block in a secondary force limiting mandrel according to a first embodiment of the present application. Fig. 5 is a schematic structural view of a force limiting torsion spring in a secondary force limiting mandrel according to a first embodiment of the present application. Fig. 6 is a schematic structural view of a limiting structure in a secondary force limiting mandrel according to a first embodiment of the present application.
As shown in fig. 1 to 6, a second-stage force limiting mandrel 100 according to a first embodiment of the present application is provided on a retractor for limiting the retraction of an automobile seat belt. The second-stage force limiting mandrel 100 provided in the first embodiment of the application includes a mandrel body 1, as shown in fig. 2, a connecting shaft head 8 capable of being connected with a coil spring is provided at the left end of the mandrel body 1, a lockable shaft head 2 with a locking function is provided at the right end of the mandrel body 1, and the lockable shaft head 2 can realize locking of the mandrel body 1. The mandrel body 1 is provided with an inner hollow structure, namely, a hollow structure is arranged in the mandrel body 1, and the hollow structure is used for installing the force limiting rod 6. Specifically, a first receiving groove (not shown) is provided inside one end of the connecting stub shaft 8, in which one end of the force limiting lever 6 is mounted; a limiting groove 232 is provided on the lockable spindle head 2 on the side facing the spindle body 1, and the other end of the force limiting lever 6 is mounted in this limiting groove 232.
Further, in the first embodiment of the present application, the lockable shaft head 2 includes a fixing plate 21, a locking wheel 22, and a shaft head 23 sequentially disposed, and the fixing plate 21 is disposed near the mandrel body 1. The side of the spindle head 23 facing the spindle body 1 is provided with a protruding structure 231, and the protruding structure 231 sequentially penetrates through the locking wheel 22 and the fixing plate 21 towards the spindle body 1 to fixedly connect the locking wheel 22 and the fixing plate 21 with the spindle head 23. And the end of the protruding structure 231, which is close to the mandrel body 1, is a specific setting position of the limiting groove 232, namely, the other end of the force limiting rod 6 is installed in the limiting groove 232 of the lockable shaft head 2, specifically, the other end of the force limiting rod 6 is installed in the limiting groove 232 of the protruding structure 231 of the shaft head 23. When the lockable spindle head 2 is locked, the spindle body 1 is driven by the safety belt to continue to rotate, and at this time, based on the fact that one end of the force limiting rod 6 is limited in the first accommodating groove in the spindle body 1, the other end of the force limiting rod 6 is limited in the limiting groove 232 of the lockable spindle head 2, the force limiting rod 6 rotates with relatively constant torque, so that the retractor does not limit the safety belt to be pulled out any more, the force limiting rod 6 rotates synchronously with the spindle body 1, and the safety belt is pulled out from the retractor with relatively constant force value. In this way, the force value acting on the occupant's chest will no longer rise, maintaining the current chest pressure until the end of the collision. The pressure of the chest of the passenger is effectively controlled, so that the protection effect on the passenger is improved.
For further maintenance of the pressure value to which the chest of the occupant is subjected no longer increases, the secondary force limiting spindle 100 of the first embodiment of the application further comprises a fixed block 4, a force limiting torsion spring 5 and a limiting structure 7.
The fixing block 4 is inserted into the second accommodating groove 11 at the end part of the mandrel body 1 and can rotate along with the mandrel body 1. Specifically, in the first embodiment of the present application, as shown in fig. 2, 3 and 4, the second receiving groove 11 is provided on the wall of the mandrel body 1 on the side close to the lockable shaft head 2. The fixing block 4 has an arc matching the circumferential end surface 211 of the fixing plate 21, wherein the whole body of the fixing plate 21 is a hollow cylinder, and the wall body thereof is circular arc-shaped, so that the circumferential end surface 211 thereof must have an arc. The fixing block 4 includes an integrally formed fixing protrusion 41 and at least two claw arms 42, and at least one receiving port. Specifically, the fixing protrusion 41 is disposed at one end of the fixing block 4 facing the second accommodating groove 11, the fixing block 4 is inserted into the second accommodating groove 11 at the end of the mandrel body 1, and specifically, the fixing protrusion 41 of the fixing block 4 is inserted into the second accommodating groove 11 at the end of the mandrel body 1. At least two claw arms 42 are distributed in turn along the arc direction of the fixed block 4, and the extending direction of each claw arm 42 is the same as the axial direction of the lockable shaft head 2 and opposite to the protruding direction of the fixed protrusion 41. The receiving openings are formed between adjacent ones of the claw arms 42. The force limiting torsion spring 5 is abutted with the claw arm 42 and the accommodating port.
Further, in the first embodiment of the present application, at least two of the claw arms 42 may be provided as three claw arms 42, and at least one of the receiving ports may be provided as two receiving ports, specifically defined as a first receiving port 43 and a second receiving port 44. The distal ends of the three claw arms 42 are respectively attached to the lockable shaft head 2, and the lockable shaft head 2 includes a fixing plate 21, so that the distal ends of the three claw arms 42 are respectively attached to the fixing plate 21, and the formed first receiving opening 43 and second receiving opening 44 are in a closed structure, so that degrees of freedom in more directions can be defined.
In the first embodiment of the present application, the force limiting torsion spring 5 abuts against the fixed block 4, wherein, as shown in fig. 5, the force limiting torsion spring 5 includes an integrally formed clamping portion 51 and force limiting portion 52. The locking portion 51 is locked to the limiting structure 7. The force limiting portion 52 passes through the first receiving opening 43 in an outward direction and passes through the second receiving opening 44 in an inward direction after bypassing one of the claw arms 42 provided between the first receiving opening 43 and the second receiving opening 44. The inward direction is the direction facing the central axis of the lockable shaft head 2.
When the force limiting portion 52 bypasses one of the claw arms 42 provided between the first accommodation port 43 and the second accommodation port 44, the force limiting portion 52 is in contact with the claw arm 42. It should be noted that, when the fixing block 4 is provided with only two claw arms 42, a receiving opening may be formed by the two claw arms 42, corresponding to the above. At this time, the force limiting portion 52 passes around the claw arm 42 on the side of the receiving port in the outward direction, and then passes through the receiving port in the inward direction. When the force limiting portion 52 passes around the claw arm 42 on the side of the accommodation opening in the outward direction, the force limiting portion 52 abuts against the claw arm 42.
Of course, the number of the claw arms 42 is also large, so that the number of the formed accommodating openings is also large, and the manner of making the force limiting portion 52 of the force limiting torsion spring 5 pass through each accommodating opening is also different, but the scope of the first embodiment of the present application is all that is required to be protected as long as the contact between the force limiting portion 52 and the claw arms 42 can be realized.
In the first embodiment of the present application, one claw arm 42 provided between the first accommodation opening 43 and the second accommodation opening 44, the end face thereof which is attached to the portion of the force limiting portion 52 is provided as an arc face, and both side edges of the plurality of claw arms 42 in the arc direction of the fixed block 4 are provided as rounded structures.
In the first embodiment of the present application, based on the abutment of the force limiting portion 52 with the claw arm 42, the force limiting torsion spring 5 is allowed to receive the torsion transmitted by the fixed block 4 during the start of the rotation of the fixed block 4 with a relatively constant torque, and the force limiting portion 52 is deformed by the torsion, so that the retractor is no longer limited to pull out the webbing, the force limiting lever 6 rotates in synchronization with the spindle body 1, and the webbing is pulled out from the retractor with a relatively constant force value. In this way, the force value acting on the occupant's chest will no longer rise, maintaining the current chest pressure until the end of the collision. The pressure of the chest of the passenger is effectively controlled, so that the protection effect on the passenger is improved.
In the first embodiment of the present application, the clamping portion 51 of the force limiting torsion spring 5 includes a clamping support 511, a first clamping groove 512 and a second clamping groove 513. The clamping support body 511 has an arc matching with the circumferential end surface 211 on the inner side of the fixing plate 21, and the clamping support body 511 is attached to the circumferential end surface 211 on the inner side of the fixing plate 21. The circumferential end surface 211 on the inner side of the fixing plate 21 is a circumferential surface that can be bonded to the outer circumferential surface of the protrusion 231 when the protrusion 231 of the stub shaft 23 passes through the fixing plate 21. The first clamping groove 512 is disposed at the end of the clamping support body 511, and the first clamping groove 512 can be clamped with a limiting structure 7 (a first limiting protrusion 71 described below) disposed on the inner circumferential end surface 211 of the fixing plate 21 and limits movement of the force limiting torsion spring 5 on the fixing plate 21 along the first direction. The connection between the locking portion 51 and the force limiting portion 52 forms a second locking groove 513, and the second locking groove 513 can be locked with a limiting structure 7 (a second limiting protrusion 72 described below) on the radial end surface 212 of the fixing plate 21 and limits movement of the force limiting torsion spring 5 on the fixing plate 21 in the second direction. Wherein the first direction and the second direction are opposite directions, so that the force limiting torsion spring 5 can be fixedly clamped.
Further, in the first embodiment of the present application, in order to fix the limiting torsion spring to the lockable stub shaft 2, a limiting structure 7 is also provided. Specifically, the limiting structure 7 is disposed on a side of the lockable spindle head 2 facing the spindle body 1, and the force limiting torsion spring 5 is fixed on the lockable spindle head 2 through the limiting structure 7. Wherein, corresponding to the foregoing, the limiting structure 7 is provided on the fixing plate 21 of the lockable stub shaft 2. The limiting structure 7 comprises: a first defining protrusion 71 and a second defining protrusion 72. Specifically, the first defining projection 71 is provided on the circumferential end surface 211 of the inner side of the fixing plate 21, and the second defining projection 72 is provided on the radial end surface 212 of the fixing plate 21 toward the mandrel body 1 side. Corresponding to the above-mentioned clamping support body 511, the first clamping groove 512 and the second clamping groove 513 in the clamping portion 51 included in the force limiting torsion spring 5, the first clamping groove 512 may be clamped with the first limiting protrusion 71 to limit the movement of the force limiting torsion spring 5 on the fixing plate 21 along the first direction, and the second clamping groove 513 may be clamped with the second limiting protrusion 72 to limit the movement of the force limiting torsion spring 5 on the fixing plate 21 along the second direction, where the first direction and the second direction are opposite directions, so that the force limiting torsion spring 5 may be fixedly clamped on the fixing plate 21.
The first embodiment of the present application provides a two-stage force limiting mandrel 100, which is arranged on a retractor, and comprises a mandrel body 1 and a lockable shaft head 2 arranged at the end part of the mandrel body 1, and further comprises: the device comprises a fixed block 4, a force limiting torsion spring 5, a force limiting rod 6 and a limiting structure 7; one end of the force limiting rod 6 is limited in a first accommodating groove in the mandrel body 1, and the other end of the force limiting rod is limited in a limiting groove 232 of the lockable shaft head 2; the fixed block 4 is inserted into a second accommodating groove 11 at the end part of the mandrel body 1 and can rotate along with the mandrel body 1; the limiting structure 7 is arranged on one side of the lockable shaft head 2 facing the mandrel body 1, and the force limiting torsion spring 5 is fixed on the lockable shaft head 2 through the limiting structure 7 and is abutted with the fixed block 4; when the lockable shaft head 2 is locked, the mandrel body 1 drives the force limiting rod 6 to rotate, and the fixed block 4 is synchronously driven by the mandrel body 1 to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring 5. The fixing block 4, the force limiting torsion spring 5, the force limiting rod 6 and the limiting structure 7 provided by the first embodiment of the application have simple structures, and the components are assembled on the mandrel body 1 in a clamping or inserting manner, so that the assembly manner of the multistage force limiting structure and the mandrel body 1 is simplified, the structure based on the components is simple, and the assembly with the mandrel body 1 is simple, thereby reducing the cost of manufacturing the mandrel of the retractor.
A second embodiment of the present application provides a retractor (not shown) comprising: the coiler body to and set up the second grade limit force dabber 100 on the coiler body, but including dabber body 1 and the locking spindle nose 2 of setting in the tip of dabber body 1 still include: the device comprises a fixed block 4, a force limiting torsion spring 5, a force limiting rod 6 and a limiting structure 7; one end of the force limiting rod 6 is limited in a first accommodating groove in the mandrel body 1, and the other end of the force limiting rod is limited in a limiting groove 232 of the lockable shaft head 2; the fixed block 4 is inserted into a second accommodating groove 11 at the end part of the mandrel body 1 and can rotate along with the mandrel body 1; the limiting structure 7 is arranged on one side of the lockable shaft head 2 facing the mandrel body 1, and the force limiting torsion spring 5 is fixed on the lockable shaft head 2 through the limiting structure 7 and is abutted with the fixed block 4; when the lockable shaft head 2 is locked, the mandrel body 1 drives the force limiting rod 6 to rotate, and the fixed block 4 is synchronously driven by the mandrel body 1 to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring 5.
Based on the fact that the secondary force limiting mandrel 100 is a structure provided in the first embodiment, the specific structure is set forth with reference to the description of the first embodiment, and will not be repeated here.
While the application has been described in terms of preferred embodiments, it is not intended to be limiting, but rather, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (6)
1. The utility model provides a second grade limit force dabber, sets up on the coiler, including dabber body and setting are in but the locking spindle nose of the tip of dabber body, its characterized in that includes: the device comprises a fixed block, a force limiting torsion spring, a force limiting rod and a limiting structure;
One end of the force limiting rod is limited in a first accommodating groove in the mandrel body, and the other end of the force limiting rod is limited in a limiting groove of the lockable shaft head; the fixing block is inserted into a second accommodating groove at the end part of the mandrel body and can rotate along with the mandrel body; the limiting structure is arranged on one side of the lockable shaft head, which faces the mandrel body, and the force limiting torsion spring is fixed on the lockable shaft head through the limiting structure and is abutted with the fixed block; when the lockable shaft head is locked, the mandrel body drives the force limiting rod to rotate, and the fixed block is synchronously driven by the mandrel body to rotate and bears the force limiting effect of the elastic force of the force limiting torsion spring;
The lockable shaft head comprises a fixed plate, a locking wheel and a shaft head which are sequentially arranged along the extending direction of the force limiting rod; the fixing plate is arranged close to the mandrel body; the shaft head is provided with a protruding structure facing the mandrel body, the protruding structure penetrates through the locking wheel and the fixing plate and is fixed, and the limiting groove is located on the protruding structure; the limiting structure is arranged on the fixed plate;
The fixed block has with the radian that the circumference terminal surface of fixed plate matches, include: the fixing protrusion, at least two claw arms and at least one accommodating opening; the fixing protrusion is arranged at one end of the fixing block, which faces the second accommodating groove, and is inserted into the second accommodating groove at the end part of the mandrel body, in particular, the fixing protrusion is inserted into the second accommodating groove at the end part of the mandrel body; the at least two claw arms are distributed in sequence along the arc direction of the fixed block, and the extending direction of each claw arm is the same as the axial direction of the lockable shaft head and opposite to the protruding direction of the fixed protrusion; the accommodating port is formed between the adjacent claw arms; the force limiting torsion spring is abutted with the claw arm and the accommodating port;
The at least two claw arms comprise three claw arms, and the at least one accommodating port comprises a first accommodating port and a second accommodating port; the tail ends of the three claw arms are respectively attached to the fixed plate; the first accommodating opening and the second accommodating opening are formed between the adjacent claw arms;
the limiting structure comprises a first limiting protrusion and a second limiting protrusion; the first limiting protrusion is arranged on the circumferential end surface of the inner side of the fixed plate; the second limiting protrusion is arranged on the side facing the mandrel body and located on the radial end face of the fixing plate.
2. The secondary force limiting mandrel of claim 1, wherein the force limiting torsion spring comprises an integrally formed snap-fit portion and force limiting portion;
The clamping part is clamped with the first limiting protrusion and the second limiting protrusion;
The force limiting part passes through the first accommodating opening along the outward direction and passes through the second accommodating opening along the inward direction after bypassing one claw arm arranged between the first accommodating opening and the second accommodating opening.
3. The secondary force limiting mandrel of claim 2, wherein the clamping portion comprises a clamping support, a first clamping groove, and a second clamping groove;
the clamping support body is provided with an radian matched with the fixed plate, and is attached to the circumferential end face of the inner side of the fixed plate;
The first clamping groove is arranged at the tail end of the clamping support body, can be clamped with the first limiting protrusion, and limits the movement of the force limiting torsion spring on the fixed plate along the first direction;
the joint of the clamping part and the force limiting part forms a second clamping groove, and the second clamping groove can be clamped with the second limiting protrusion and limits the movement of the force limiting torsion spring on the fixed plate along a second direction;
The first direction and the second direction are opposite directions.
4. A secondary force limiting mandrel as claimed in claim 3 wherein a claw arm disposed between said first and second receiving openings has an end surface thereof abutting a portion of said force limiting portion provided as an arc surface.
5. The secondary force limiting mandrel of claim 4, wherein the two side edges of the plurality of claw arms along the arc direction of the fixed block are provided with rounded corner structures.
6. A retractor comprising a retractor body and a secondary force limiting mandrel as claimed in any one of claims 1 to 5 disposed on the retractor body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010748684.9A CN111873938B (en) | 2020-07-30 | 2020-07-30 | Two-stage force limiting mandrel and retractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113183915B (en) * | 2020-11-18 | 2023-05-09 | 上海和励信息科技有限公司 | Retractor and motor-driven retractor |
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| JP2015127174A (en) * | 2013-12-27 | 2015-07-09 | オートリブ ディベロップメント エービー | Retractor for seat belt |
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| CN110562191A (en) * | 2019-10-16 | 2019-12-13 | 沈阳金杯锦恒汽车安全系统有限公司 | multistage force-limiting mandrel assembly and safety belt retractor |
| CN213199681U (en) * | 2020-07-30 | 2021-05-14 | 浙江松原汽车安全系统股份有限公司 | Two-stage force-limiting mandrel and retractor |
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| CN111873938A (en) | 2020-11-03 |
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