A seat belt retractor with automatic tension and a seat belt device

Abstract

The present invention discloses a seat belt retractor with automatic tensioning and a seat belt device, comprising a bracket and a reel rotatably connected to the bracket, a seat belt connected to the reel, a retracting and discharging motor, a vehicle-sensitive sensing component and an inner tooth plate fixedly connected to the bracket, a coil spring reset member connected to the first end of the reel, a locking plate connected to the second end of the reel, a locking plate connected to the locking plate in linkage with the inner tooth plate, the vehicle-sensitive sensing component in linkage with the locking plate, a pre-tightening clutch component connected to the second end of the reel, the pre-tightening clutch component located on the side of the locking plate away from the bracket, and the pre-tightening clutch component in linkage with the retracting and discharging motor through a pre-tightening transmission component. In the present invention, the pre-tightening clutch component can cut off the transmission cooperation between the reel and the pre-tightening transmission component, so that the rotating shaft of the retracting and discharging motor will not be passively followed by the reciprocating motion of the seat belt, thereby avoiding damage to the mechanical properties of the retracting and discharging motor and ensuring the service life and mechanical stability of the retracting and discharging motor.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a seat belt retractor with automatic tensioning and a seat belt device. Background Art

[0002] The seat belt retractor is the core component of the car seat belt, which refers to the seat belt retractor with emergency locking function. Under normal circumstances, the occupant can pull the seat belt freely and at a constant speed on the seat, and the ratchet mechanism in the retractor allows the seat belt to be extended as needed; when the continuous pulling process of the seat belt from the retractor stops, or the vehicle encounters an emergency (such as collision, sudden braking, etc.), the ratchet mechanism will immediately lock the seat belt automatically to prevent it from being pulled out further.

[0003] In addition to the above functions, existing seat belt retractors can also retract and pre-tighten the seat belt after fastening the seat belt, eliminate the gap between the seat belt and the body, and more effectively prevent possible injuries in the event of an emergency; and in current high-end models, when the seat is adjusted or according to the passenger's body posture, the seat belt can be automatically released to adapt to the required belt length for the current seat position. The retraction, pre-tightening and automatic release of the seat belt require the installation of a retractor motor, which drives the seat belt reel to rotate through a transmission mechanism to achieve pre-tightening and proper release of the seat belt. However, during normal use, the reciprocating pulling and retracting of the seat belt will cause the retractor motor's rotating shaft to passively follow through the transmission mechanism, which will easily affect the mechanical properties of the retractor motor over time, resulting in the retractor motor being unable to pre-tighten and release the seat belt normally.

[0004] In view of this, it is urgent to design a seat belt retractor and a seat belt device with automatic tension to solve the technical defect of low life of the retractable motor when it is actually used. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a seat belt retractor with automatic tensioning and a seat belt device.

[0006] In a first aspect of the present invention, a seat belt retractor with automatic tensioning is provided, comprising a bracket and a reel rotatably connected to the bracket, the reel being connected to a seat belt, the bracket being fixedly connected to a retracting and discharging motor, a vehicle-sensitive sensing component and an inner tooth plate, a first end of the reel being connected to a coil spring reset member, a second end of the reel being connected to a locking plate, a locking plate being connected to the locking plate and cooperating with the inner tooth plate, the vehicle-sensitive sensing component and the locking plate being cooperating with each other, and a pre-tightening clutch member being further connected to the second end of the reel, the pre-tightening clutch member being located on a side of the locking plate away from the bracket, the pre-tightening clutch member being linked to the retracting and discharging motor through a pre-tightening transmission member; when the reel is rotated by pulling out the seat belt or recovering the reel spring reset member, the pre-tightening clutch member cuts off the transmission cooperation between the reel and the pre-tightening transmission member; when the retracting and discharging motor is actively running, the pre-tightening transmission member drives the reel to rotate through the pre-tightening clutch member to pre-tighten or release the seat belt.

[0007] The present invention is further configured that the pre-tightening clutch component includes a pre-tightening rotary disk, the outer circumference of the pre-tightening rotary disk is provided with pre-tightening external teeth, and the pre-tightening external teeth are meshed with the pre-tightening transmission component, and the pre-tightening rotary disk is internally encapsulated with a locking disk and a separation disk coaxially arranged with the pre-tightening rotary disk, and the separation disk is connected to the second end of the reel, and the locking disk and the separation disk are linked together. A forward clamping arm and a reverse clamping arm are symmetrically arranged on both sides of the locking disk, and the first end of the forward clamping arm and the first end of the reverse clamping arm are both hinged on the pre-tightening rotary disk, and the second end of the forward clamping arm and the second end of the reverse clamping arm are both provided with a protruding column, and a locking and unlocking composite part is provided on the side of the forward clamping arm close to the locking disk and the side of the reverse clamping arm close to the locking disk; the locking and unlocking composite part is respectively linked to the locking disk, and the protruding columns are respectively linked to the separation disk.

[0008] The present invention is further configured such that the pre-tightening clutch component also includes a return spring, the return spring includes a return spring body and torsion ends located at both ends of the return spring body, the torsion ends are respectively connected to the bosses, the return spring body is located between the inner wall of the pre-tightening turntable and the separation disk, the return spring drives the forward clamping arm and the reverse clamping arm to move closer to the locking disk respectively; a cover is connected to the bracket, a bearing seat is provided in the cover, and a sleeve is provided at the center position of the locking disk and is passed through the pre-tightening turntable, and the sleeve is connected to the bearing seat.

[0009] The present invention is further configured such that a plurality of locking grooves are provided on the outer periphery of the locking disk, and arc-shaped guide surfaces are formed on both sides of the opening of the locking grooves, and the lock-release composite part is linked to the locking grooves; the outer periphery of the separation disk is provided with continuously alternating raised outer edges and recessed outer edges, and arc-shaped guide surfaces are formed on both sides of the raised outer edge, and the protruding columns are linked to the raised outer edge and the recessed outer edge respectively.

[0010] The present invention is further configured such that a positioning shaft is provided on the locking disk, a positioning groove is provided on the separation disk, and the positioning shaft is movably connected in the positioning groove.

[0011] The present invention is further configured such that the locking and unlocking composite part includes a locking outer edge and an unlocking outer edge; during the relative rotation of the locking disk and the preloaded rotating disk, when the locking groove first contacts the locking outer edge of the locking and unlocking composite part, the locking and unlocking composite part is clamped in the locking groove, and when the locking groove first contacts the unlocking outer edge of the locking and unlocking composite part, the locking and unlocking composite part is disengaged from the locking groove.

[0012] The present invention is further configured to provide an auxiliary plate between the locking plate and the pre-tightening clutch component, the locking plate and the auxiliary plate are coaxially arranged, the outer periphery of the locking plate is provided with a locking outer tooth, the outer side of the auxiliary plate is provided with an auxiliary outer tooth, the number of teeth of the auxiliary outer tooth is greater than the number of teeth of the locking outer tooth; the auxiliary plate is connected to a positioning plate, the positioning plate is connected to the second end of the reel, the positioning plate is provided with a positioning buckle, the auxiliary plate is clamped on the positioning buckle, the inner ring of the positioning plate is provided with an inner ratchet, and the auxiliary plate is provided with a ratchet portion matching the inner ratchet; the vehicle-sensitive sensing component includes a vehicle-sensitive seat body and a lever member movably connected to the vehicle-sensitive seat body, a movable steel ball is provided between the vehicle-sensitive seat body and the lever member, and one end of the lever member is provided with a locking claw, and the locking claw is respectively linked to the locking outer tooth and the auxiliary outer tooth.

[0013] The present invention is further configured that the second end of the reel is also connected to a compression spring positioning piece, the compression spring positioning piece is connected to a compression spring, the compression spring includes a sleeve portion, an extension portion and a pressing portion, the sleeve portion is connected to the second end of the reel, the lever member is provided with a pressure-bearing portion, the pressing portion is located on one side of the pressure-bearing portion and is linked to the pressure-bearing portion.

[0014] The present invention is further configured such that the inner circumference of the inner tooth plate is provided with engaging internal teeth, limiting portions are provided on both sides of the second end of the reel, the locking plate is overlapped on the limiting portion, the locking plate is provided with locking internal teeth on the side facing the engaging internal teeth, a torsion spring is sleeved on the locking plate, and the torsion spring is linked to the limiting portion.

[0015] In a second aspect of the present invention, a seat belt device is provided, comprising the above-mentioned seat belt retractor with pretensioning.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] In the present technical solution, a pre-tensioning clutch component is added to the seat belt retractor. During normal use of the seat belt, when the passenger pulls out or retracts the seat belt as needed, the pre-tensioning clutch component can cut off the transmission cooperation between the reel and the pre-tensioning transmission component, so that the rotating shaft of the retracting and discharging motor will not passively follow the reciprocating motion of the seat belt, thereby avoiding damage to the mechanical properties of the retracting and discharging motor. This ensures the service life and mechanical stability of the retracting and discharging motor, so that it can perform the pre-tensioning action normally after the seat belt is inserted into the buckle, realizing the pre-tensioning function of the seat belt, and when the seat is adjusted or according to the passenger's body posture, the seat belt can be automatically released to adapt to the belt delivery length required for the current seat position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a seat belt retractor according to an embodiment of the present invention.

[0019] Figure 2 It is an exploded view of a seat belt retractor according to an embodiment of the present invention.

[0020] Figure 3 This is an exploded view of the seat belt retractor after removing the cover according to an embodiment of the present invention.

[0021] Figure 4 The figure is a schematic diagram of the interior of a seat belt retractor cover according to an embodiment of the present invention.

[0022] Figure 5 It is an exploded view of the preload clutch assembly according to an embodiment of the present invention.

[0023] Figure 6 It is an exploded view of some components of the preload clutch assembly according to an embodiment of the present invention.

[0024] Figure 7 Schematic diagram of the internal structure of the pre-tightening clutch assembly according to an embodiment of the present invention.

[0025] Figure 8 This is a cross-sectional view of the internal structure of the pre-tightening clutch assembly according to an embodiment of the present invention.

[0026] Fig. 9 It is an exploded view of the auxiliary plate and the positioning plate according to an embodiment of the present invention.

[0027] Fig.10 This is an exploded view of the reel and locking disk according to an embodiment of the present invention.

[0028] Fig.11 This is a three-dimensional diagram of a scroll according to an embodiment of the present invention.

[0029] Description of the accompanying drawings: 1. bracket; 11. retractable discharge motor; 12. vehicle sensitive sensing member; 121. vehicle sensitive seat; 122. lever member; 1221. engaging claw; 1222. pressure receiving portion; 123. steel ball; 13. inner tooth plate; 131. occlusal inner tooth; 14. cover; 2. reel; 21. first end; 22. second end; 23. limit portion; 3. coil spring reset member; 4. locking plate; 41. locking plate; 411. locking inner tooth; 42. locking outer tooth; 43. torsion spring; 5. pre-tightening clutch member; 51. pre-tightening rotating plate; 511. pre-tightening outer tooth; 512. clamping arm shaft; 52. locking plate; 521. shaft sleeve; 522. locking groove; 523. positioning shaft; 53. separation plate; 531 , raised outer edge; 532, recessed outer edge; 533, positioning groove; 54, forward clamping arm; 541, forward boss; 542, forward locking and unlocking composite part; 543, forward locking outer edge; 544, forward unlocking outer edge; 55, reverse clamping arm; 551, reverse boss; 552, reverse locking and unlocking composite part; 553, reverse locking outer edge; 554, reverse unlocking outer edge; 56, return spring; 561, return spring body; 562, torsion end; 6, pre-tightening transmission component; 7, auxiliary disk; 71, auxiliary outer teeth; 72, ratchet part; 8, positioning disk; 81, positioning buckle; 82, inner ratchet; 9, compression spring positioning member; 10, compression spring; 101, sleeve part; 102, extension part; 103, pressing part. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] Combined with Figure 1 To Attachment Fig.11The technical solution of the present invention is a seat belt retractor with automatic tension, comprising a bracket 1 and a reel 2 rotatably connected to the bracket 1, the reel 2 is connected to a seat belt, the bracket 1 is fixedly connected to a retracting and discharging motor 11, a vehicle sensitive component 12 and an inner tooth plate 13, the first end 21 of the reel 2 is connected to a coil spring reset member 3, the second end 22 of the reel 2 is connected to a locking plate 4, the locking plate 4 is connected to a locking piece 41 that cooperates with the inner tooth plate 13, the vehicle sensitive component 12 cooperates with the locking plate 4, the second end of the reel 2 22 is also connected to a pre-tightening clutch component 5, which is located on the side of the locking plate 4 away from the bracket 1, and the pre-tightening clutch component 5 is linked to the retracting and discharging motor 11 through a pre-tightening transmission component 6; when the reel 2 is rotated by pulling out the seat belt or recovering the coil spring reset member 3, the pre-tightening clutch component 5 cuts off the transmission cooperation between the reel 2 and the pre-tightening transmission component 6; when the retracting and discharging motor 11 is actively running, the pre-tightening transmission component 6 drives the reel 2 to rotate through the pre-tightening clutch component 5 to pre-tighten or release the seat belt.

[0033] In this embodiment, the safety belt is wound around the reel 2, which is not shown in the drawings.

[0034] In this embodiment, the preload transmission component 6 is a transmission gear or a transmission gear set, which is selected and determined according to the output torque of the transceiver motor 11 .

[0035] In this embodiment, the Figure 2 and attached Figure 5 The X direction is the seat belt pulling direction, and the Y direction is the seat belt retracting direction.

[0036] In this embodiment, as shown in the attached Figure 2 As shown, when the seat belt is pulled out, the reel 2 rotates around the X direction, and the coil spring reset member 3 stores energy. When the seat belt is locked in the buckle, the energy-stored coil spring reset member 3 retracts most of the pulled-out seat belt, but there is still an obvious gap between the seat belt and the body (there is still excess seat belt that has not been pulled back); at this time, the retracting and discharging motor 11 needs to work, and drive the reel 2 to rotate around the Y direction through the pre-tightening transmission member 6 and the pre-tightening clutch member 5 to retract the remaining seat belt, thereby realizing the pre-tightening function of the seat belt; when the passenger adjusts the seat, the original seat belt length may restrain the passenger during the adjustment process, causing discomfort during the adjustment process. At this time, the retracting and discharging motor 11 works, and drives the reel 2 to rotate around the X direction through the pre-tightening transmission member 6 and the pre-tightening clutch member 5 to release the seat belt, and performs the above-mentioned seat belt pre-tightening action after the seat adjustment is completed.

[0037] In this embodiment, the signal for the active operation of the retractable discharge motor 11 is controlled by an ECU (Electronic Control Unit) electronic control unit. The seat belt pre-tightening action can be triggered by inserting the seat belt into a buckle or after the vehicle starts, etc., and the present invention does not make specific limitations on this. The seat belt automatic release action can be triggered by adjusting the seat position or a human body posture sensing signal, etc., and the present invention does not make specific limitations on this.

[0038] In this embodiment, the vehicle-sensitive sensing member 12 is linked with the locking plate 4 when the vehicle tilts or brakes suddenly, so that the locking plate 4 stops rotating, thereby preventing the reel 2 from rotating in the X direction and the seat belt from being pulled out, thereby protecting the passengers.

[0039] In this embodiment, when the seat belt is pulled out quickly (the seat belt pulling-out acceleration reaches a threshold value), the locking plate 41 is displaced relative to the locking plate 4, so that the locking plate 41 forms a locking fit with the inner tooth plate 13, so that the locking plate 4 stops rotating, thereby preventing the reel 2 from rotating in the X direction and the seat belt from being pulled out, thereby protecting the passengers.

[0040] In this embodiment, by adding a pre-tightening clutch component 5 to the seat belt retractor, during normal use of the seat belt, when the passenger pulls out or retracts the seat belt as needed, the pre-tightening clutch component 5 can cut off the transmission cooperation between the reel 2 and the pre-tightening transmission component 6, so that the rotating shaft of the retracting and discharging motor 11 will not passively follow the reciprocating motion of the seat belt, thereby avoiding damage to the mechanical properties of the retracting and discharging motor 11, which ensures the service life and mechanical stability of the retracting and discharging motor 11, so that it can perform the pre-tightening action normally after the seat belt is inserted into the buckle, realize the pre-tightening function of the seat belt, and when the seat is adjusted or according to the passenger's body posture, the seat belt can be automatically released to adapt to the belt length required for the current seat position. How the pre-tightening clutch component 5 specifically realizes the above functions is referred to the following embodiments.

[0041] In this embodiment, combined with the attached Figure 5 To Attachment Figure 8The pre-tightening clutch component 5 includes a pre-tightening rotating disk 51, and the outer periphery of the pre-tightening rotating disk 51 is provided with pre-tightening external teeth 511, and the pre-tightening external teeth 511 are meshed with the pre-tightening transmission component 6. The pre-tightening rotating disk 51 is encapsulated with a locking disk 52 and a separation disk 53 coaxially arranged with the pre-tightening rotating disk 51. The separation disk 53 is connected to the second end 22 of the reel 2, and the locking disk 52 and the separation disk 53 are linked. The two sides of the locking disk 52 are symmetrically provided with a forward clamping arm 54 and a reverse clamping arm 55, and the first end of the forward clamping arm 54 and the first end of the reverse clamping arm 55 are respectively hinged. On the arm shaft 512 of the pre-tightening turntable 51, the second end of the forward arm 54 is provided with a forward boss 541, and the second end of the reverse arm 55 is provided with a reverse boss 551. The forward arm 54 is provided with a forward locking and releasing composite part 542 on the side close to the locking disk 52, and the reverse arm 55 is provided with a reverse locking and releasing composite part 552 on the side close to the locking disk 52; the forward locking and releasing composite part 542 and the reverse locking and releasing composite part 552 are respectively linked to the locking disk 52, and the forward boss 541 and the reverse boss 551 are respectively linked to the separation disk 53.

[0042] In this embodiment, the separation disc 53 rotates along with the rotation of the reel 2 ; the forward clamping arm 54 and the reverse clamping arm 55 rotate along with the rotation of the pre-tightening rotary disc 51 .

[0043] In this embodiment, the preload clutch component 5 also includes a return spring 56, which includes a return spring body 561 and torsion ends 562 located at both ends of the return spring body 561, and the torsion ends 562 are respectively connected to the forward boss 541 and the reverse boss 551, and the return spring body 561 is located between the inner wall of the preload turntable 51 and the separation disk 53, and the return spring 56 drives the forward clamping arm 54 and the reverse clamping arm 55 to move closer to the locking disk 52 respectively; a cover 14 is connected to the bracket 1, and a bearing seat is provided in the cover 14, and a shaft sleeve 521 is provided at the center position of the locking disk 52, which is penetrated by the preload turntable 51, and the shaft sleeve 521 is connected to the bearing seat.

[0044] In this embodiment, the bearing seat is not shown in the accompanying drawings, and its main function is to provide a rotation axis for the locking disk 52; the torsion end 562 can be a columnar structure inserted into the forward boss 541 or the reverse boss 551, or it can be an annular structure sleeved on the forward boss 541 or the reverse boss 551.

[0045] In this embodiment, the function of the return spring 56 is to make the forward locking and releasing composite part 542 of the forward clamping arm 54 and the reverse locking and releasing composite part 552 of the reverse clamping arm 55 fit the outer edge of the locking plate 52 .

[0046] In this embodiment, a plurality of locking grooves 522 are provided on the outer periphery of the locking disk 52, and arc-shaped guide surfaces are formed on both sides of the opening of the locking grooves 522. The forward locking and releasing composite part 542 and the reverse locking and releasing composite part 552 are respectively linked to the locking grooves 522; the outer periphery of the separation disk 53 is provided with continuously and alternately arranged raised outer edges 531 and recessed outer edges 532, and arc-shaped guide surfaces are formed on both sides of the raised outer edges 531, and the forward boss 541 / the reverse boss 551 are respectively linked to the raised outer edge 531 and the recessed outer edge 532.

[0047] In this embodiment, a positioning shaft 523 is provided on the locking disk 52, and a positioning groove 533 is provided on the separation disk 53. The positioning shaft 523 is movably connected in the positioning groove 533. The above structure enables the locking disk 52 and the separation disk 53 to have a period of relative displacement before synchronous rotation, which is the key to the pre-tightening clutch component 5 to achieve bidirectional clutch.

[0048] In this embodiment, the forward locking and unlocking composite part 542 includes a forward locking outer edge 543 and a forward unlocking outer edge 544, and the reverse locking and unlocking composite part 552 includes a reverse locking outer edge 553 and a reverse unlocking outer edge 554; during the relative rotation of the locking disk 52 and the preload rotating disk 51, when the locking groove 522 first contacts the forward locking outer edge 543 of the forward locking and unlocking composite part 542 or the reverse locking and unlocking composite part 552 When the reverse locking outer edge 553 is engaged, the forward locking and unlocking composite part 542 or the reverse locking and unlocking composite part 552 is clamped in the locking groove 522; when the locking groove 522 first contacts the forward unlocking outer edge 544 of the forward locking and unlocking composite part 542 or the reverse unlocking outer edge 554 of the reverse locking and unlocking composite part 552, the forward locking and unlocking composite part 542 or the reverse locking and unlocking composite part 552 is disengaged from the locking groove 522.

[0049] In this embodiment, as shown in the attached Figure 8 As shown, the forward locking outer edge 543 forms an angle less than 90° with the forward clamping arm 54 body and the angle forms an arc chamfer, and the forward unlocking outer edge 544 forms an angle greater than 90° with the forward clamping arm 54 body; the reverse locking outer edge 553 forms an angle less than 90° with the reverse clamping arm 55 body and the angle forms an arc chamfer, and the reverse unlocking outer edge 554 forms an angle greater than 90° with the reverse clamping arm 55 body. The two inner corners of the locking groove 522 form inner concave arc surfaces that match the forward locking outer edge 543 and the reverse locking outer edge 553.

[0050] In the above embodiment, the structure of the forward locking outer edge 543 and the locking groove 522 is such that when the forward clamping arm 54 forms a locking fit with the locking groove 522, the end of the protruding outer edge 531 touches the forward protruding column 541, and the forward locking and unlocking composite portion 542 cannot be separated from the locking groove 522, and the forward protruding column 541 acts on the end of the protruding outer edge 531 to drive the separation disk to rotate. The reverse clamping arm 55 is the same as the reverse clamping arm 55 after forming a locking fit with the locking groove 522, and no further description is given.

[0051] In this embodiment, the action principle of the pre-tightening clutch component 5 in the seat belt retractor is:

[0052] When the seat belt is pulled out by the driver, the reel 2 rotates around the X direction, driving the separation disk 53 to rotate around the X direction; the raised outer edge 531 of the separation disk 53 acts on the reverse boss 551 of the reverse clamp arm 55, so that the reverse clamp arm 55 rotates outward with the clamp arm shaft 512 as the rotation center, so that the reverse lock and release composite part 552 of the reverse clamp arm 55 cannot form a locking match with the locking groove 522 of the locking disk 52; when the locking disk 52 rotates with the separation disk 53, the reverse lock and release composite part 552 of the reverse clamp arm 55 cannot form a locking match with the locking groove 522 of the locking disk 52. The arc-shaped guide surface on the side of the locking groove 522 of the locking plate 52 acts on the forward unlocking outer edge 544 of the forward clamping arm 54, so that the forward clamping arm 54 also rotates outward with the clamping arm shaft 512 as the rotation center, so that the forward locking and unlocking composite part 542 of the forward clamping arm 54 cannot form a locking fit with the locking groove 522 of the locking plate 52; thereby, the pre-tightening rotating disk 51 will not rotate with the rotation of the reel 2, and the transmission fit between the pre-tightening transmission component 6 and the retracting and discharging motor 11 is disconnected;

[0053] When the safety belt is retracted by the coil spring return member 3, the reel 2 rotates around the Y direction, driving the separation disk 53 to rotate around the Y direction; the raised outer edge 531 of the separation disk 53 acts on the forward protrusion 541 of the forward clamping arm 54, so that the forward clamping arm 54 rotates outward with the clamping arm shaft 512 as the rotation center, so that the forward locking and unlocking composite part 542 of the forward clamping arm 54 cannot form a locking cooperation with the locking groove 522 of the locking disk 52; the locking disk 52 rotates with the separation disk 53 , the arc-shaped guide surface on the side of the locking groove 522 of the locking disk 52 acts on the reverse unlocking outer edge 554 of the reverse clamping arm 55, so that the reverse clamping arm 55 also rotates outward with the clamping arm shaft 512 as the rotation center, so that the reverse locking and unlocking composite part 552 of the reverse clamping arm 55 cannot form a locking match with the locking groove 522 of the locking disk 52; thereby, the pre-tightening rotating disk 51 will not rotate with the rotation of the reel 2, and the transmission match between the pre-tightening transmission component 6 and the retracting and discharging motor 11 is disconnected;

[0054] When the retractable and discharge motor 11 receives the ECU instruction to perform the pre-tightening action, the retractable and discharge motor 11 drives the pre-tightening turntable 51 to rotate in the Y direction through the pre-tightening transmission member 6, and the pre-tightening turntable 51 drives the forward clamping arm 54 and the reverse clamping arm 55 to rotate synchronously, and the reverse locking outer edge 553 of the reverse clamping arm 55 forms a locking fit with the locking groove 522, and the reverse protrusion 551 of the reverse clamping arm 55 acts on the end of the protruding outer edge 531, driving the separation disk to rotate in the Y direction, thereby driving the reel 2 to rotate, and realizing the recovery and pre-tightening of the seat belt;

[0055] When the retractable and discharge motor 11 receives an ECU instruction to execute a releasing action, the retractable and discharge motor 11 drives the pre-tightening turntable 51 to rotate in the X direction through the pre-tightening transmission component 6, and the pre-tightening turntable 51 drives the forward clamping arm 54 and the reverse clamping arm 55 to rotate synchronously, and the forward locking outer edge 543 of the forward clamping arm 54 forms a locking fit with the locking groove 522, and the forward protrusion 541 of the forward clamping arm 54 acts on the end of the protruding outer edge 531, driving the separation disk to rotate in the X direction, thereby driving the reel 2 to rotate, and realizing the active release of the seat belt.

[0056] In this embodiment, during the process of manually pulling out the seat belt and retracting the seat belt by the coil spring return member 3, the pre-tensioning turntable 51 of the pre-tensioning clutch component 5 will not follow; during the process of retracting, pre-tensioning and actively releasing the retracting and discharging motor 11, the pre-tensioning clutch component 5 drives the reel 2 to perform the retracting and releasing action, thereby avoiding the risk of motor damage of the retracting and discharging motor 11 due to passive transmission.

[0057] In this embodiment, as shown in the attached Fig. 9 As shown, an auxiliary plate 7 is further provided between the locking plate 4 and the pre-tightening clutch member 5, the locking plate 4 and the auxiliary plate 7 are coaxially arranged, the outer periphery of the locking plate 4 is provided with locking external teeth 42, the outer part of the auxiliary plate 7 is provided with auxiliary external teeth 71, the number of teeth of the auxiliary external teeth 71 is greater than the number of teeth of the locking external teeth 42; a positioning plate 8 is connected to the auxiliary plate 7, the positioning plate 8 is connected to the second end 22 of the reel 2, a positioning buckle 81 is provided on the positioning plate 8, and the auxiliary plate 7 is clamped on the positioning buckle 8 1, the inner ring of the positioning plate 8 is provided with an inner ratchet 82, and the auxiliary plate 7 is provided with a ratchet portion 72 that cooperates with the inner ratchet 82; the vehicle-sensitive sensing component 12 includes a vehicle-sensitive seat body 121 and a lever member 122 movably connected to the vehicle-sensitive seat body 121, a movable steel ball 123 is provided between the vehicle-sensitive seat body 121 and the lever member 122, and a clamping claw 1221 is provided at one end of the lever member 122, and the clamping claw 1221 is respectively linked to the locking outer tooth 42 and the auxiliary outer tooth 71.

[0058] In this embodiment, the auxiliary plate 7 is additionally provided and the number of teeth of the auxiliary outer teeth 71 is greater than the number of teeth of the locking outer teeth 42, so that when the vehicle sensitive sensing member 12 is sensing, the engaging claw 1221 of the lever member 122 is first stopped with the auxiliary outer teeth 71 and then stopped with the locking outer teeth 42, thereby improving the reliability of the retracting stop.

[0059] In this embodiment, as shown in the attached Figure 4 As shown, the second end 22 of the reel 2 is also connected to a compression spring positioning member 9, and the compression spring positioning member 9 is connected to a compression spring 10, and the compression spring 10 includes a sleeve portion 101, an extension portion 102 and a pressing portion 103, and the sleeve portion 101 is connected to the second end 22 of the reel 2, and a pressure-bearing portion 1222 is provided on the lever member 122, and the pressing portion 103 is located on one side of the pressure-bearing portion 1222 and is linked to the pressure-bearing portion 1222; the compression spring 10 is used to suppress the noise caused by the shaking of the steel ball 123 during the driving of the car.

[0060] In this embodiment, as shown in the attached Fig.10 As shown, the inner circumference of the inner tooth plate 13 is provided with an engaging inner tooth 131, and the two sides of the second end 22 of the reel 2 are provided with a limiting portion 23, the locking plate 41 is overlapped on the limiting portion 23, and the locking plate 41 is provided with a locking inner tooth 411 on the side facing the engaging inner tooth 131, and a torsion spring 43 is sleeved on the locking plate 4, and the torsion spring 43 is linked to the limiting portion 23.

[0061] In this embodiment, a retaining spring may be provided between the pre-tightening clutch member 5 and the auxiliary disk 7 to separate them and avoid friction therebetween.

[0062] Example 2

[0063] Combined with Figure 1 To Attachment Fig.11 The technical solution of the present invention is a seat belt device, including the seat belt retractor with pretensioning as described in Example 1; and can obtain the beneficial effects brought by the retractor of the above-mentioned embodiment. The assembly of the retractor, webbing and other related parts and components can refer to the existing technology and will not be discussed in detail here.

[0064] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seat belt retractor with automatic tensioning, comprising a bracket and a reel rotatably connected to the bracket, the reel being connected to a seat belt, the bracket being fixedly connected to a retracting and discharging motor, a vehicle-sensitive sensing component and an inner tooth plate, the first end of the reel being connected to a coil spring reset member, the second end of the reel being connected to a locking plate, the locking plate being connected to a locking sheet that cooperates with the inner tooth plate, the vehicle-sensitive sensing component being in linkage with the locking plate, characterized in that: The second end of the reel is also connected to a pre-tightening clutch component, which is located on a side of the locking disk away from the bracket, and the pre-tightening clutch component is linked to the retracting and discharging motor through a pre-tightening transmission component; when the reel is rotated by pulling out the seat belt or recovering the coil spring reset member, the pre-tightening clutch component cuts off the transmission cooperation between the reel and the pre-tightening transmission component; when the retracting and discharging motor is actively running, the pre-tightening transmission component drives the reel to rotate through the pre-tightening clutch component to pre-tighten or release the seat belt; The locking plate is connected to the second end of the reel, and the locking plate and the separation plate are linked together. A forward clamping arm and a reverse clamping arm are symmetrically arranged on both sides of the locking plate, and the first end of the forward clamping arm and the first end of the reverse clamping arm are both hinged on the pre-tightening rotating plate, and the second end of the forward clamping arm and the second end of the reverse clamping arm are both provided with a protruding column, and a locking and releasing composite part is provided on the side of the forward clamping arm close to the locking plate and the side of the reverse clamping arm close to the locking plate; the locking and releasing composite part is respectively linked to the locking plate, and the protruding columns are respectively linked to the separation plate.

2. A seat belt retractor with automatic tensioning according to claim 1, characterized in that: The pre-tightening clutch component also includes a return spring, which includes a return spring body and torsion ends located at both ends of the return spring body, the torsion ends are respectively connected to the bosses, the return spring body is located between the inner wall of the pre-tightening turntable and the separation disk, and the return spring drives the forward clamping arm and the reverse clamping arm to move closer to the locking disk respectively; a cover is connected to the bracket, a bearing seat is provided in the cover, and a sleeve is provided at the center of the locking disk and is penetrated through the pre-tightening turntable, and the sleeve is connected to the bearing seat.

3. A seat belt retractor with automatic tensioning according to claim 1, characterized in that: The outer periphery of the locking disk is provided with a plurality of locking grooves, and both sides of the openings of the locking grooves are arc-shaped guide surfaces, and the lock-release composite part is linked to the locking grooves; the outer periphery of the separation disk is provided with continuously and alternately arranged raised outer edges and recessed outer edges, and both sides of the raised outer edges are arc-shaped guide surfaces, and the protruding columns are linked to the raised outer edges and the recessed outer edges respectively.

4. A seat belt retractor with automatic tensioning according to claim 3, characterized in that: The locking disk is provided with a positioning shaft, the separation disk is provided with a positioning groove, and the positioning shaft is movably connected in the positioning groove.

5. A seat belt retractor with automatic tensioning according to claim 3, characterized in that: The lock-and-release composite part includes a locking outer edge and an unlocking outer edge; during the relative rotation of the locking disk and the preloaded rotating disk, when the locking groove first contacts the locking outer edge of the lock-and-release composite part, the lock-and-release composite part is engaged in the locking groove, and when the locking groove first contacts the unlocking outer edge of the lock-and-release composite part, the lock-and-release composite part is disengaged from the locking groove.

6. A seat belt retractor with automatic tensioning according to any one of claims 1 to 5, characterized in that: An auxiliary plate is also provided between the locking plate and the pre-tightening clutch component, and the locking plate is coaxially arranged with the auxiliary plate, and the outer periphery of the locking plate is provided with a locking outer tooth, and the outer side of the auxiliary plate is provided with an auxiliary outer tooth, and the number of teeth of the auxiliary outer tooth is greater than the number of teeth of the locking outer tooth; the auxiliary plate is connected to the positioning plate, and the positioning plate is connected to the second end of the reel, and the positioning plate is provided with a positioning buckle, and the auxiliary plate is clamped on the positioning buckle, and the inner ring of the positioning plate is provided with an inner ratchet, and the auxiliary plate is provided with a ratchet portion that cooperates with the inner ratchet; the vehicle-sensitive sensing component includes a vehicle-sensitive seat body and a lever member movably connected to the vehicle-sensitive seat body, a movable steel ball is provided between the vehicle-sensitive seat body and the lever member, and one end of the lever member is provided with a locking claw, and the locking claw is respectively linked to the locking outer tooth and the auxiliary outer tooth.

7. A seat belt retractor with automatic tensioning according to claim 6, characterized in that: The second end of the reel is also connected to a compression spring positioning piece, and a compression spring is connected to the compression spring positioning piece. The compression spring includes a sleeve portion, an extension portion and a pressing portion. The sleeve portion is connected to the second end of the reel, and a pressure-bearing portion is provided on the lever member. The pressing portion is located at one side of the pressure-bearing portion and is linked to the pressure-bearing portion.

8. A seat belt retractor with automatic tensioning according to any one of claims 1 to 5, characterized in that: The inner circumference of the inner tooth plate is provided with engaging inner teeth, and limiting parts are provided on both sides of the second end of the reel. The locking plate is overlapped on the limiting part, and the locking plate is provided with locking inner teeth on the side facing the engaging inner teeth. A torsion spring is sleeved on the locking plate, and the torsion spring is linked to the limiting part.

9. A seat belt device, characterized in that: A seat belt retractor with automatic tensioning comprising the device described in any one of claims 1 to 8.

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