JP5419643B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device in which a brake by a motor is not applied to a spindle when a pretensioner is operated.

  When it is predicted that the possibility of a collision is high, a seat belt device is used that eliminates the looseness of the seat belt to suppress the movement of the occupant before the collision, and winds up the seat belt at a high speed and restrains the occupant at the time of the collision. . In such a seat belt device, the spindle is rotated by a motor to wind up the seat belt, thereby eliminating the looseness of the seat belt. When an impact due to a collision is detected, the explosive pretensioner is activated to rotate the spindle, wind the seat belt at a high speed with a strong belt tension, and restrain the occupant.

  When the motor connected to the spindle rotates during the operation of the pretensioner, a regenerative current flows between the motor and the power supply unit that supplies power to the motor, and a regenerative brake is generated in the motor. Then, the rotation of the spindle by the pretensioner is braked, and the speed at which the seat belt is wound is reduced. In view of this, there is a seat belt device in which an off-clutch mechanism is provided so that the drive shaft of the motor is separated from the spindle when the pretensioner is operated so that the brake is not applied to the spindle (see, for example, Patent Document 1).

International Publication No. 2006/123750 Pamphlet

  However, the seat belt device according to the prior art cannot provide a seat belt device in which the brake by the motor is not applied to the spindle without providing an off-clutch mechanism that increases the number of parts.

  The present application has been made in view of such circumstances. The purpose of the seat belt is to prevent the motor brake from being applied to the spindle by providing a cutting part for cutting the power supply terminal of the motor and the conductor connecting the power source or the power line to be cut when the pretensioner is operated. To provide an apparatus.

  The seat belt device disclosed in the present application is a seat belt device including a motor and a pretensioner that winds up the seat belt, and a cutting portion interposed between a power supply terminal of the motor and a power source that supplies power to the power supply terminal. And a driving force transmission part that transmits a driving force for the pretensioner to wind up the seat belt to the cutting part, the cutting part being driven by the driving force transmitted by the driving force transmission part. Is to be cut.

  In the present application, when the pretensioner is activated, the seat belt is wound up by the rotational driving force, and the power supply line connecting the motor power supply terminal and the power source to the cutting portion is cut using the rotational driving force.

  The seat belt device disclosed in the present application includes a spindle on which the seat belt is wound, and the pretensioner is connected to a rotation shaft of the spindle, and includes a drive shaft that rotationally drives the spindle, and the driving force The transmission unit is connected to the drive shaft.

  In the present application, when the pretensioner is operated, the spindle is rotationally driven to wind the seat belt, and the rotational driving force is transmitted to the cutting part by the driving force transmission part connected to the driving shaft of the pretensioner. The

  The seat belt device disclosed in the present application includes the driving force transmission unit including a spindle connected to the driving shaft, and a belt connected to the cutting unit and wound around the spindle. Comprises a moving part that moves from a non-operating position to a cutting position for cutting the conductor by the belt.

  In the present application, one end of the belt is fixed to a spindle connected to the drive shaft of the pretensioner. When the pretensioner is activated, the other end of the belt wound around the spindle moves the cutting portion from the non-operating position to the cutting position.

  The seat belt device disclosed in the present application is a seat belt device including a motor and a pretensioner that winds up the seat belt, and a cutting portion interposed between a power supply terminal of the motor and a power source that supplies power to the power supply terminal. And a control unit that operates the cutting unit to cut the conductor when the seat belt is wound up by the pretensioner.

  In the present application, the looseness of the seat belt is wound up by the motor. The pretensioner operates after the power supply terminal of the motor and the power supply line connecting the power supply are disconnected. The seat belt is quickly wound up by the pretensioner without causing regenerative braking by the motor.

  The seat belt device disclosed in the present application is a seat belt device including a motor that winds up a seat belt and a pretensioner, and includes a spindle on which the seat belt is wound up, and the pretensioner is configured from a plurality of surfaces on which balls are fitted. A rotor having a rotating shaft connected to the rotating shaft of the spindle and a delivery port provided toward the outer peripheral surface, and delivering a plurality of balls contained therein to the outer peripheral surface. A ball delivery section for rotating the rotor by a ball fitted to the outer peripheral surface, and a power supply line for supplying power to the motor, the power supply line being cut by a ball moving in the ball delivery section It is.

  In the present application, when the pretensioner operates, a plurality of balls sent toward the rotor are sequentially fitted to a plurality of surfaces provided on the outer peripheral surface of the rotor, and the rotor connected to the spindle is rotated. Let Further, the power supply line for supplying power to the motor is cut by the moving ball.

  According to one aspect of the apparatus, when the pretensioner is operated, the motor brake is applied to the spindle by providing a cutting portion for cutting a power supply terminal of the motor and a conductor connecting the power source, or a power line to be cut. There is nothing.

It is a schematic diagram which shows the outline | summary of the seatbelt apparatus and airbag apparatus which were each installed in the seat and the front side of the seat. 3 is an explanatory diagram illustrating an example of a seat belt retractor and a control unit according to Embodiment 1. FIG. It is a disassembled perspective view which shows a seatbelt retractor. It is a disassembled perspective view which shows the spindle and pretensioner attached to the housing. It is a longitudinal cross-sectional view which shows the principal part of the spindle attached to the housing which concerns on Embodiment 1, and a pretensioner. It is typical sectional drawing which shows the pretensioner before the action | operation in the VI-VI cross section in FIG. It is typical sectional drawing which shows the pretensioner just after the action | operation in the VI-VI cross section in FIG. It is typical sectional drawing which shows the pretensioner at the time of the completion | finish of operation | movement in the VI-VI cross section in FIG. 2 is a block diagram illustrating internal hardware of a control unit and hardware connected to the control unit according to Embodiment 1. FIG. It is a flowchart which shows the procedure of a collision process. FIG. 10 is a block diagram illustrating internal hardware of a control unit according to Embodiment 2 and hardware connected to the control unit. FIG. 10 is an explanatory diagram illustrating an example of a seat belt retractor and a control unit according to a third embodiment. It is a longitudinal cross-sectional view which shows the principal part of the spindle attached to the housing which concerns on Embodiment 3, and a pretensioner. FIG. 10 is an explanatory diagram illustrating an example of a seat belt retractor and a control unit according to Embodiment 4. 6 is a schematic cross-sectional view of a pretensioner according to Embodiment 4. FIG.

Embodiment 1
Hereinafter, embodiments will be specifically described with reference to the drawings. The seat belt system according to the present application is mounted on a vehicle in order to protect an occupant from an impact generated when the vehicle collides. The seat belt system includes a vehicle collision prediction unit that predicts a vehicle collision, an impact detection unit that detects an impact, an airbag device, and a seat belt device that protects an occupant. FIG. 1 is a schematic diagram showing an outline of a seat belt device and an airbag device installed on the seat and the front side of the seat, respectively. The seat belt device 10 includes a seat belt 13 that restrains the body of the occupant 11 to the seat 12. The seat belt 13 includes a belt portion 13 a that restrains the upper body of the occupant 11 and a belt portion 13 b that restrains the waist of the occupant 11.

  One end of the belt portion 13b is fixed to the vehicle body portion at the lower part of the passenger compartment by an anchor plate 14. The belt portion 13 a is folded back by a through anchor 15 provided at a location near the shoulder of the occupant 11, and an end portion thereof is connected to a spindle of the seat belt retractor 16. A tongue plate 17 is attached to the other common end of the seat belt 13. The tongue plate 17 is detachable from a buckle 18 fixed to the lower edge of the seat 12. The seat belt retractor 16 is controlled to be pulled out by the control unit described later.

  FIG. 2 is an explanatory diagram illustrating an example of the seat belt retractor 16 and the control unit according to the first embodiment. The seat belt retractor 16 includes a spindle 22 rotatably provided in the housing 21, a motor 23 and a pretensioner 25 that rotationally drive the spindle 22, and an urging portion 26 that urges the spindle 22 in the winding direction. Prepare. The end of the belt portion 13 a of the seat belt 13 is coupled to the spindle 22, and the belt portion 13 a is wound up by the spindle 22. The pretensioner 25 is provided on the side surface of the housing 21 and the shaft 22a of the spindle 22 is coupled thereto.

  When the operation signal is input from the control unit 3, the pretensioner 25 ignites the built-in explosive, rotates the shaft 22 a forwardly with the generated gas, and rotationally drives the spindle 22. Thus, the pretensioner 25 instantaneously winds the seat belt 13 around the spindle 22 and has a strong belt tension so that the occupant 11 can be restrained. For example, the pretensioner 25 completes the winding of the seat belt 13 within a few milliseconds after receiving the operation signal. A gear mechanism 24 is attached to the pretensioner 25, and the shaft 22 a of the spindle 22 is connected to the drive shaft 23 a of the motor 23 via the gear mechanism 24.

  The rotation of the motor 23 is controlled by the control device 3. The gear mechanism 24 includes a reduction gear that decelerates the rotation of the drive shaft 23 a of the motor 23, and transmits the driving force of the motor 23 to the spindle 22. Then, the spindle 22 is rotationally driven in the winding direction by the motor 23, and the seat belt 13 (belt portion 13 a) is wound around the spindle 22. As a result, the seat belt 13 is pulled to increase the belt tension, and the movement of the occupant 11 can be suppressed.

  The power supply terminal 23b of the motor 23 and one output terminal of the power supply device 6 are connected to the terminal 5a and the terminal 5b of the switch 5 (disconnection unit), respectively. The other output terminal of the power supply device 6 is connected to the power supply terminal 23c of the motor. The switch 5 is a changeover switch that switches connection and release of the terminal 5a and the terminal 5b. Further, in the initial state where the switch signal is not given from the control unit 3, the switch 5 is in an initial position (non-operating position) where the terminal 5a and the terminal 5b are connected, and the power supply terminal 23b is connected to the power supply device. One output terminal 6 is connected. When a switch signal is given from the control unit 3, the switch 5 switches the switch position to an open position (cutting position) that opens between the terminal 5 a and the terminal 5 b, and outputs one of the output terminals of the power supply device 6 from the power supply terminal 23 b. Is disconnected.

  FIG. 3 is an exploded perspective view showing the seat belt retractor 16. The urging unit 26 includes a front cover 261, a winding spring 262, and a partition wall 263. A winding spring 262 for rotating and energizing the spindle 22 in the winding direction is coupled to one end of the shaft 22a of the spindle 22 with a substantially disk-shaped partition wall 263 having a through hole at the center. The winding spring 262 is configured by a spring, and has an inner peripheral end coupled to the shaft 22a, and an outer peripheral end coupled to the inner wall of the front cover 261 of the seat belt retractor 16. The front cover 261 is attached to the gear mechanism 24 by screwing after the winding spring 262 and the partition wall 263 are set inside the front cover 261.

  FIG. 4 is an exploded perspective view showing the spindle 22 and the pretensioner 25 attached to the housing 21. The housing 21 includes a frame 210 composed of three plates connected in a U-shape, a side cover 211 that covers the opening of the frame 210, and a rectangular hole through which the seat belt 13 extending from the spindle 22 passes. And a guide part 212 having The spindle 22 is rotatably inserted inside the frame 210 through a hole provided in the side surface of the frame 210. On the outer peripheral surface of the shaft 22a protruding with respect to the pretensioner 25, there is provided a sleeve 22b that contacts the clutch plate provided in the pretensioner 25 and transmits the rotational driving force from the pretensioner 25.

  The pretensioner 25 includes a synchro ring 252, a clutch portion 253, a rotor 254, and a pretension ring 255 between the drive cover 250 and the frame 210, and a tube housing 251 around the pretension ring 255. Prepare. The pretension ring 255 is rotatably supported between the drive cover 250 and the frame 210. The pretension ring 255 includes a plurality of locking pieces 255a that can project from the inner peripheral surface to the outer peripheral surface of the rotor 254. A plurality of shutter portions 252 a spaced in the circumferential direction are provided on the inner surface of the synchro ring 252, and the protrusion of the shutter portion 252 a is formed on the outer surface of the rotor 254 as the synchro ring 252 rotates. It has a sliding surface that slides along. Clutch portion 253 includes a circular frame and a plurality of clutch plates that are spaced apart in the circumferential direction and extend along the central axis of the frame.

  The tube housing 251 is attached to the frame 210, and includes a plurality of spheres 251a made of a sphere of metal or the like and a spring 251b, and one end thereof is sealed by a gas generator 251c. The other end of the tube housing 251 is provided with a delivery port 251 d, and the delivery port 251 d is arranged so as to face a groove provided on the outer peripheral surface of the pretension ring 255. Then, due to the gas pressure increase due to the ignition of the gas generator 251c, the plurality of balls 251a are pushed out and enter the groove portion of the pretension ring 255 from the outlet 251d of the tube housing 251, and the pretension ring 255 is rotated. A ball stop 161 that receives a ball 251 a that has escaped from the groove of the rotating pretension ring 255 is attached to the frame 210. The spring 251b prevents the generation of abnormal noise due to the rattling of the ball 251a at normal times.

  FIG. 5 is a longitudinal sectional view showing the main parts of the spindle 22 and the pretensioner 25 attached to the housing according to the first embodiment. The locking piece 255 a of the pretension ring 255 protrudes from the inner peripheral surface of the pretension ring 255 in the initial state, and is locked in a locking groove provided on the outer peripheral surface of the rotor 254. A clutch plate of the clutch portion 253 is disposed between the inner peripheral surface of the hole portion of the rotor 254 and the sleeve 22b. The drive cover 250 includes a locking claw 250 a that is biased toward a tooth portion provided on the outer periphery of the synchro ring 252.

  6 is a schematic cross-sectional view showing the pretensioner 25 before operation in the VI-VI cross section in FIG. The white arrows in FIG. 6 indicate the pull-out direction and the winding direction of the seat belt 13. In the initial state, since the clutch plate of the clutch portion 253 is separated from the sleeve 22b, the shaft 22a of the spindle 22 is rotatable and is urged to rotate in the winding direction by the urging portion 26. . In this case, only the shaft 22a having the sleeve 22b rotates in accordance with the withdrawal or winding of the seat belt 13.

  Each locking piece 255a of the pretension ring 255 has a rotation shaft at the base, and the tip projects from the outer peripheral surface of the rotor 254 from the storage portion provided on the inner peripheral surface with rotation. . In the initial state, the tip of each locking piece 255 a is locked in a locking groove provided on the outer peripheral surface of the rotor 254, and is pressed toward the locking groove of the rotor 254 by the shutter portion 252 a of the synchro ring 252. Has been. This prevents each locking piece 255a from coming off the locking groove of the rotor 254.

  The two locking claws 250a mesh with rack teeth provided on the outer periphery of the synchro ring 252 so that the synchro ring 252 can be rotated only in the rotation direction corresponding to the winding direction of the seat belt 13. It has become. In the tube housing 251, a plurality of spheres 251a are continuous from one end sealed by the gas generator 251c to a part of the groove portion of the pretension ring 255 located in the vicinity of the delivery port 251d with the spring 251b interposed therebetween.

  FIG. 7 is a schematic cross-sectional view showing the pretensioner 25 immediately after operation in the VI-VI cross section in FIG. A white arrow in FIG. 7 indicates a winding direction of the seat belt 13. When the pretensioner 25 receives the operation signal from the control unit 3, the gas generated by igniting the explosive contained in the gas generation unit 251 c pushes the plurality of balls 251 a from the outlet 251 d of the tube housing 251. The extruded ball 251a enters the groove on the outer peripheral surface of the pretension ring 255 and rotates the pretension ring 255 counterclockwise. The ball 251 a that has come out of the groove due to the rotation of the pretension ring 255 is stored in the ball stop 161. The pretension ring 255 rotates counterclockwise together with the rotor 254 in which each locking piece 255a is locked in the cam groove.

  The inner peripheral surface of the rotor 254 has a cam surface in which the inner diameter of the position where the clutch plate of the clutch portion 253 is disposed becomes shorter as it rotates counterclockwise. As the rotor 254 rotates counterclockwise together with the pretension ring 255, the cam surface comes into contact with the clutch plate of the clutch portion 253 and presses toward the sleeve 22b. Due to the frictional force between the clutch plate of the clutch part 253 and the sleeve 22b, the rotational driving force of the pretension ring 255 and the rotor 254 is transmitted to the shaft 22a having the sleeve 22b. As a result, the shaft 22a of the spindle 22 is rotated counterclockwise, and the seat belt 13 starts to be wound.

  FIG. 8 is a schematic cross-sectional view showing the pretensioner 25 at the completion of the operation in the VI-VI cross section in FIG. 5. The white arrows in FIG. 8 indicate the direction in which the seat belt 13 is pulled out. When the extrusion of the sphere 251a by the gas generated by the gas generator 251c is completed, the pretensioner 25 is completed and the winding of the seat belt 13 is completed. Then, the occupant 11 moves forward due to the collision, and the seat belt 13 is pulled out. The spindle 22 starts rotating right together with the pretension ring 255.

  By rotating the pretension ring 255 to the right, the front end of each locking piece 255a is disengaged from the shutter portion 252a, and each locking piece 255a rotates rightward with the base as a center, and is stored on the inner peripheral surface of the pretension ring 255 Stored in the unit. Thereby, the front end of each locking piece 255a is removed from the locking groove of the rotor 254, and the rotor 254 connected to the shaft 22a can be rotated.

  FIG. 9 is a block diagram illustrating internal hardware of the control unit 3 and hardware connected to the control unit 3 according to the first embodiment. The control unit 3 includes a CPU (Central Processing Unit) 30 that controls the hardware via a bus 30a, a ROM (Read-Only Memory) 31 that stores a program, variables that are generated during the execution of the program, and the like. RAM (Random-Access Memory) 32 for storing. The control unit 3 includes a timer 33 in which a predetermined time is set in advance as a timer value, a prediction signal input unit 34 to which a prediction signal is input, and an impact signal input unit 35 to which an impact signal is input.

  The timer value set in the timer 33 may be determined by empirically and empirically obtaining a period until the impact due to the collision is detected after the collision is predicted. For example, several seconds are set as the timer value. The timer 33 starts a countdown by the CPU 30 and outputs a timer signal to the bus 30a when the timer value becomes zero. The prediction signal input unit 34 receives a prediction signal output when the collision prediction unit 1 included in the vehicle body predicts a collision. The collision prediction unit 1 predicts a collision by measuring time-dependent changes in the positional relationship between the own vehicle and other vehicles with a radar or the like mounted on the vehicle body.

  An impact signal is input to the impact signal input unit 35 from the impact detection unit 2 included in the vehicle body. The impact detection unit 2 is an acceleration sensor, and outputs an impact signal when an acceleration of a predetermined value or more due to a collision or the like is detected. Further, the CPU 30 has a drive signal output unit 36 that outputs a drive signal that instructs the motor 23 to rotate, a switch signal output unit 37 that outputs a switch signal to the switch 5, and an operation that outputs an operation signal to the pretensioner 25. And a signal output unit 38.

  FIG. 10 is a flowchart showing the procedure of the collision process. The collision process is executed by the CPU 30 of the control unit 3. The CPU 30 determines whether or not a prediction signal is input from the collision prediction unit 1 to the prediction signal input unit 34 (step S11). If the CPU 30 determines that the prediction signal is not input (NO in step S11), the CPU 30 waits until the prediction signal is input. When it is determined that the prediction signal has been input (YES in step S11), the CPU 30 outputs a drive signal for instructing rotation from the drive signal output unit 36 to the motor 23 to rotate the motor 23 (step S12). Thereby, the seatbelt 13 is wound up and the movement of the passenger | crew 11 is suppressed.

  The CPU 30 gives the timer 33 a timing start signal to cause the timer 33 to start timing (step S13). The CPU 30 determines whether or not an impact signal is input from the impact detection unit 2 to the impact signal input unit 35 (step S14). When determining that the impact signal is not input (NO in step S14), the CPU 30 determines whether the timer signal output from the timer 33 is detected (step S15). When it is determined that the timer signal is not detected (NO in step S15), the CPU 30 returns the process to step S14.

  When it is determined that the timer signal has been detected (YES in step S15), the CPU 30 outputs a drive signal instructing stoppage from the drive signal output unit 36 to the motor 23 and stops the motor 23 (step S16). And CPU30 resets the timer 33 (step S17), and returns a process to step S11. Thus, when a predetermined time set in the timer 33 has elapsed since the input of the prediction signal, the motor 23 is stopped assuming that a predicted collision has not occurred, and the prediction signal is returned to the standby state.

  If the CPU 30 determines that an impact signal has been input in step S14 (YES in step S14), the CPU 30 outputs a switch signal for instructing disconnection from the switch signal output unit 37 to the switch 5 and from the power supply terminal 23b of the motor 23 to the power supply device. 6 is disconnected (step S18). As a result, the rotation of the motor 23 stops. The CPU 30 outputs an operation signal from the operation signal output unit 38 to the pretensioner 25 to operate the pretensioner 25 (step S19), and ends the collision process.

  A regenerative current does not flow in the motor 23 that rotates together with the spindle 22 by the operation of the pretensioner 25 because the power supply terminal 23b and one output terminal of the power supply device 6 are disconnected. Accordingly, the pretensioner 25 can rotate the spindle 22 without causing the motor 23 to brake. Further, in order to prevent the motor 23 from braking the pretensioner 25, a gear mechanism is used as an off-clutch mechanism for separating the drive shaft 23a of the motor 23 from the shaft 22a of the spindle 22 when the pretensioner 25 is operated. 24 need not be provided.

Embodiment 2
FIG. 11 is a block diagram illustrating internal hardware of a control unit and hardware connected to the control unit according to the second embodiment. In the second embodiment, the power supply connection to the motor 23 is disconnected by the switch 5 that receives the switch signal in the first embodiment, whereas the switch 5 that receives the operation signal to the pretensioner 25 is disconnected. It is. The control unit 7 includes an operation signal output unit 78 that outputs an operation signal to the pretensioner 25 and the switch 5. The switch 5 receives the operation signal given from the operation signal output unit 78 as a switch signal, and disconnects between the terminal 5a and the terminal 5b. Since other internal hardware of the control unit 7 is the same as that of the control unit 3 of the first embodiment, only the difference in reference numerals is described, and detailed description thereof is omitted.

  The control unit 7 includes a CPU 70 that controls the hardware via the bus 70a, a ROM 71, a RAM 72, a timer 73, a prediction signal input unit 74, an impact signal input unit 75, and a drive signal output unit 76. Prepare. When it is determined that the impact signal is input in step S14 of the collision processing procedure shown in FIG. 10 (YES in step S14), the CPU 70 executes step S19 without executing step S18 and ends the collision processing. . An operation signal is given to the pretensioner 25 to start the operation, and the operation signal is given to the switch 5 to disconnect the power supply terminal 23b of the motor 23 from one output terminal of the power supply device 6. Accordingly, the pretensioner 25 can rotate the spindle 22 without causing the motor 23 to brake.

  The second embodiment is as described above, and the other parts are the same as those of the first embodiment. Therefore, the corresponding parts are denoted by the same reference numerals and processing names, and detailed description thereof is omitted.

Embodiment 3
FIG. 12 is an explanatory diagram illustrating an example of a seat belt retractor and a control unit according to the third embodiment. Reference numeral 46 in FIG. 12 denotes a seat belt retractor including the pretensioner 55. Since the other parts of the seat belt retractor 46 are the same as those of the seat belt retractor 16 of the first embodiment, only the difference in reference numerals will be described, and detailed description will be omitted. The seat belt retractor 46 includes a spindle 52 provided in the housing 51, a motor 53 having power supply terminals 53b and 53c and a drive shaft 53a, a gear mechanism 54, a pretensioner 55, and an urging portion 56. The pretensioner 55 and the motor 53 are connected to the control unit 7 that is supplied with power from the power supply device 6.

  The pretensioner 55 includes a switch belt (belt) 556 that is wound during operation, and the switch belt 556 is connected to the switch (cutting unit, moving unit) 8. Each of the terminal 8 a and the terminal 8 b of the switch 8 is connected to one output terminal of the power supply device 6 and the power supply terminal 53 b of the motor 53. The power supply terminal 53 c of the motor 53 is connected to the other output terminal of the power supply device 6. The switch 8 is a changeover switch whose switch position is movable between a position where the terminals 8a and 8b are connected and a position where the terminals 8b and 8c are connected. When the pretensioner 55 is activated and the switch belt 556 is wound in the direction indicated by the white arrow, the switch position is moved to a position where the switch 8 is connected between the terminal 8b and the terminal 8c, and the power supply terminal 53b of the motor 53 is connected. Is disconnected from one output terminal of the power supply device 6.

  FIG. 13 is a longitudinal sectional view showing the main parts of the spindle 52 and the pretensioner 55 attached to the housing 51 according to the third embodiment. The pretensioner 55 includes a pretension ring 555 having a locking piece 555a and a belt reel 555b around which the switch belt 556 is wound. The belt reel 555 b and the switch belt 556 function as a driving force transmission unit that transmits the rotational driving force of the pretensioner 55 to the switch (cutting unit) 8. Since the other parts of the pretensioner 55 are the same as those of the pretensioner 25 of the first embodiment, only the difference in reference numerals is described, and detailed description thereof is omitted.

  The pretensioner 55 includes a drive cover 550 having a locking claw 550a, a tube housing 551 filled with a plurality of balls 551a, a synchro ring 552, a clutch portion 553, and a rotor 554. Further, the shaft 52a of the spindle 22 passes through the pretensioner 25, and the outer peripheral surface of the shaft 52a includes a sleeve 52b. When it is determined that the impact signal is input in step S14 of the collision processing procedure shown in FIG. 10 (YES in step S14), the CPU 70 executes step S19 without executing step S18 and ends the collision processing. .

  In the third embodiment, the switch belt 556 wound by the rotational driving force of the pretension ring 555 switches the switch position of the switch 8 and disconnects one output terminal of the power supply device 6 from the power supply terminal 53b of the motor 53. . Thereby, the pretensioner 55 can rotate the spindle 52 without causing a brake by the motor 53.

  The third embodiment is as described above, and the other parts are the same as in the first embodiment. Therefore, the corresponding parts are denoted by the same reference numerals and processing names, and detailed description thereof is omitted.

Embodiment 4
FIG. 14 is an explanatory diagram illustrating an example of a seat belt retractor and a control unit according to the fourth embodiment. The seat belt retractor 86 includes a pretensioner 95 having terminals 95a and 95b. Since the other parts of the seat belt retractor 86 are the same as those of the seat belt retractor 16 of the first embodiment, only the difference in reference numerals will be described. The pretensioner 95 includes a housing 91, a spindle 92 having a shaft 92 a, a motor 93 having a drive shaft 93 a, power supply terminals 93 b and 93 c, a gear mechanism 94, and an urging portion 96. Further, the controller 7 is connected to the motor 93 and the pretensioner 95. A power supply device 6 is connected to the motor 93 and the control unit 7. The terminals 95 a and 95 b of the pretensioner 95 are connected to one output terminal of the power supply device 6 and the power supply terminal 93 b of the motor 93.

  FIG. 15 is a schematic cross-sectional view of the pretensioner 95 according to the fourth embodiment. The pretensioner 95 includes a power line 95c that connects the terminals 95a and 95b. Since the other parts of the pretensioner 95 are the same as those of the pretensioner 25 of the first embodiment, only the difference in reference numerals is described, and detailed description thereof is omitted. The pretensioner 95 is filled with a locking claw 950a, a plurality of balls 951a, a tube housing 951 having a delivery port 251d, a synchro ring 952 having a shutter portion 952a, a clutch portion 953, a rotor 954, And a pretension ring 955 having a locking piece 955a. A shaft 92 a having a sleeve 92 b is inserted inside the clutch portion 953. A ball stop 161 that receives a sphere 951 a discharged from the tube housing 951 is provided in the housing 91.

  The power line 95c passes through the inside of the tube housing 951. When the pretensioner 95 starts operating, the power line 95c is cut by the ball 951a that has started moving toward the ball stop 161. When the power line 95c is disconnected, the power supply terminal 93b of the motor 93 connected to the terminal 95a is disconnected from one output terminal of the power supply device 6 connected to the terminal 95b. When it is determined that the impact signal is input in step S14 of the collision processing procedure shown in FIG. 10 (YES in step S14), the CPU 70 executes step S19 without executing step S18 and ends the collision processing. .

  In the fourth embodiment, the power supply line 95 c is cut by the moving sphere 951 a, and one output terminal of the power supply device 6 is cut from the power supply terminal 93 b of the motor 93. As a result, the pretensioner 95 can rotate the spindle 92 without causing a brake by the motor 93. Moreover, although the case where the power supply line 95c penetrates the inside of the tube housing 951 has been shown, the present invention is not limited to this, and the inside of the ball stop 161 may be penetrated and arranged on the movement locus of the sphere 951a. If there is.

  The fourth embodiment is as described above, and the other parts are the same as in the first and second embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and processing names, and detailed description thereof is omitted. .

DESCRIPTION OF SYMBOLS 1 Collision prediction part 2 Impact detection part 3, 7 Control part 5, 8 Switch (cutting part, moving part)
6 Power supply device 10 Seat belt device 11 Passenger 12 Seat 13 Seat belt 13a, 13b Belt portion 16, 46, 86 Seat belt retractor 161 Ball stop 21, 51, 91 Housing 22, 52, 92 Spindle 22a, 52a, 92a Shaft 22b, 92b Sleeve 23, 53, 93 Motor 23a, 53a Drive shaft 23b, 23c, 53b, 53c, 93b, 93c Power supply terminal 24, 54, 94 Gear mechanism 25, 55, 95 Pretensioner 250a, 550a, 950a Locking claw 251 551, 951 Pipe housing 251a, 551a, 951a Sphere 251d Outlet 252, 552, 952 Synchro ring 252a, 952a Shutter part 253, 553, 953 Clutch part 254, 554, 954 Rotor 255, 555, 955 Pre-tension ring 255a, 555a, 955a Locking piece 555b Belt reel 556 Switch belt (belt)
30, 70 CPU
33, 73 Timer 95c Power line

Claims (5)

In a seat belt device including a motor and a pretensioner that winds up a seat belt,
A cutting part inserted in a conductor connecting between a power supply terminal of the motor and a power supply supplying power to the power supply terminal;
A driving force transmitting portion for transmitting a driving force for the pretensioner to wind up the seat belt to the cutting portion;
The said cutting part is a seatbelt apparatus which cut | disconnects the said conductor with the driving force transmitted by the said driving force transmission part. A spindle on which the seat belt is wound,
The pretensioner is connected to a rotation shaft of the spindle, and includes a drive shaft that rotates the spindle.
The seat belt device according to claim 1, wherein the driving force transmission unit is connected to the driving shaft. The driving force transmission unit includes a spindle connected to the driving shaft,
A belt connected to the cutting portion and wound by the spindle;
The seat belt device according to claim 2, wherein the cutting unit includes a moving unit that moves from a non-operating position to a cutting position for cutting the conductor by the belt. In a seat belt device including a motor and a pretensioner that winds up a seat belt,
A cutting part inserted in a conductor connecting between a power supply terminal of the motor and a power supply supplying power to the power supply terminal;
A seat belt device comprising: a control unit that operates the cutting unit to cut the conductor when the seat belt is wound up by the pretensioner. In a seat belt device including a motor and a pretensioner that winds up a seat belt,
A spindle on which the seat belt is wound,
The pretensioner is
A rotor having an outer peripheral surface composed of a plurality of surfaces into which balls are fitted, and a rotation shaft connected to the rotation shaft of the spindle;
A delivery port is provided toward the outer peripheral surface, a plurality of balls contained therein are sent out to the outer peripheral surface, and a ball delivery unit that rotationally drives the rotor by a ball fitted to the outer peripheral surface;
A power line for supplying power to the motor,
The seat belt device, wherein the power line is cut by a ball moving in the ball delivery section.

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