Abstract: A webbing retractor is provided. When assembled, due to a positional relationship which is such that insert-in portions are formed between a tubular portion of a lock base and a spool shaft, grooves are formed at the tubular portion and a portion of the spool shaft. An elastically deformable terminal end portion is formed at a stopper which is press-fit into an insert-in hole. In a state in which the stopper also is installed, not only press-in load in a thrusting direction, but also press-in load in a radial direction is applied between the lock base and a spool such that a structure is fixed.

Abstract: A webbing take-up device and a vehicle are provided in which different force limiter loads can be selected at arbitrary times with a simple structure. A wire is inserted into a spool. One end portion of the wire is fixed to a lock base. Thus, when rotation of the lock base is impeded, a twisting load of a torsion bar and a drawing-through load of the wire are applied to a webbing as force limiter load. Further, a cutting gear is disposed between the spool and the lock base. When the cutting gear is rotated at an arbitrary time, the wire is cut. In this way, the force limiter load is reduced to only the twisting load of the torsion bar. As a result, different force limiter loads can be selected at arbitrary times with a simple structure.

Abstract: A webbing retractor is disclosed. One end portion of a plate is fixed to a hollow cylindrical portion of a spool. An intermediate portion of the plate is entrained around an engaging pin and the like of a gear which can rotate relatively to the spool. A pawl provided at the gear abuts the plate, and is held at a position of non-engagement with stopper teeth against urging force of a coil spring. When the spool and the gear rotate relatively, the plate, whose widthwise dimension decreases toward a final end portion thereof, is taken-up onto the hollow cylindrical portion while being rubbed by the engaging pin and the like. A force limiter load in an energy absorbing process is decreased. The pawl, whose engagement with the plate is released, meshes with the stopper teeth such that rotation of the spool is impeded.

Abstract: In a webbing retractor, when a vehicle is in an emergency, a pretensioner mechanism supplies gas in a cylinder. A slider substantially closes a gas passing portion, and a piston thereby starts to move upward. A fitting portion pushes the slider upward so as to maintain the closure of the gas passing portion, and a webbing is taken up. When an energy absorbing member in a force limiter mechanism is deformed such that the webbing is pulled out, the piston is moved downward, the gas passing portion is opened by the slider so as to discharge the gas in the cylinder from the gas passing portion.

Abstract: A webbing retractor is provided. A wire for increasing force limiter load spans between a spool and a lock base. A concave groove is formed in one end portion of the wire. A push nut of a lock plate cover engages with the concave groove and the wire is fixed. One engagement piece of the push nut is longer than other engagement pieces so as to push the one end portion of the wire toward the other engagement pieces.

Abstract: A guide pin is provided erect at a lock plate of a webbing retractor. A guide hole is formed in a V gear in correspondence with the guide pin. The guide hole is formed from a first hole portion, a second hole portion and a third hold portion. A state in which the guide pin is positioned in the first hole portion is an initial state. When relative rotation between the V gear and a spool arises, the guide pin moves from the first hole portion and reaches the second hole portion. In this process, the guide pin pushes the V gear so as to rotate reversely, and locking is cancelled. When a pushing force causing a V gear reverse rotation angle to exceed a set value is applied from the guide pin, the guide pin escapes into the third hole portion such that excessive pushing force is cancelled.

Abstract: In a webbing retractor, a wire is inserted through a through-hole of a spool on which a webbing is taken-up and from which the webbing is pulled-out. At an initial stage of a process of absorbing inertial energy of a vehicle occupant, a large force limiter load is generated by adding a rubbing force of the wire at a peripheral portion of the through-hole, to a twisting load of a torsion bar. An energy absorption amount is made large, and an amount of pulling-out of the webbing is kept low. After a predetermined amount of energy has been absorbed, when the wire is completely pulled-out from the through-hole, the rubbing force of the wire is cancelled, the force limiter load is reduced, and force applied to the vehicle occupant via the webbing is reduced.

Abstract: A webbing retractor having a force limiter mechanism whose energy absorption amount is large and which can reliably absorb energy. To this end, a wire is provided as an energy absorbing member having a fixing portion, a curved portion and a fit-in portion. When a spool rotates in a pull-out direction relative to a lock base, the fit-in portion is forcibly pulled-out from a fit-in hole and deformed while being strongly rubbed. Here, the fit-in portion deforms along an imaginary extended line of the curved portion. Thus, breaking of the wire due to concentration of shearing stress at one portion of the wire can be prevented. Deformation load which is applied to the wire can be reliably applied as force limiter load until a position of relative rotation of the spool with respect to the lock base which position is set in advance.

Abstract: An object of the present invention is to obtain an acceleration sensor that can reliably detect acceleration when inclination of an inclining member is within a fixed range, and that can reduce unnecessary movement of relevant members when inclination of the inclining member is outside of the range, so that space efficiency in an inner portion is high. In the present invention, a gear of a fixed gear fixed at a seat cushion is formed in only a portion in the circumferential direction, and a portion at which the gear is not formed is a sliding surface. One of teeth among a plurality of teeth of a pinion of a revolving gear is short, to form a notched tooth portion. In a state in which the forward-collapsed angle of a seatback exceeds a predetermined angle, the notched tooth portion faces the sliding surface and the revolving gear body no longer rotates. At this time, since a bracket at which a sensor ball is mounted also does not rotate, the bracket is held at a fixed position relative to a frame plate.

Abstract: There is provided a pretensioner which can as a whole be made smaller. A rack and pinion type pretensioner is disposed outside a second leg plate of a webbing take-up device. A driving mechanism of the pretensioner includes, as principal components, a piston formed as a rack bar, and a pinion. The pinion includes a toothed portion and a clutch portion, and is directly connected to a winding shaft. Accordingly, as compared with a conventional system in which intermediate gears are disposed between the pinion and the rack bar, the pretensioner can as a whole be made smaller both in radial and axial directions thereof.

Abstract: A webbing retractor is disclosed. One end portion of a plate is fixed to a hollow cylindrical portion of a spool. An intermediate portion of the plate is entrained around an engaging pin and the like of a gear which can rotate relatively to the spool. A pawl provided at the gear abuts the plate, and is held at a position of non-engagement with stopper teeth against urging force of a coil spring. When the spool and the gear rotate relatively, the plate, whose widthwise dimension decreases toward a final end portion thereof, is taken-up onto the hollow cylindrical portion while being rubbed by the engaging pin and the like. A force limiter load in an energy absorbing process is decreased. The pawl, whose engagement with the plate is released, meshes with the stopper teeth such that rotation of the spool is impeded.

Abstract: An inexpensive webbing retractor is obtained by making a pretensioner and a lock device small and reducing the number of parts. A plurality of protrusions are formed on an inner peripheral portion of the bearing body, which pivotally supports a clutch portion. These protrusions are brought into linear contact with an outer peripheral portion of the clutch portion, whereby the bearing body pivotally supports the clutch portion indirectly via the protrusions. Since the protrusions are brought into linear contact with the clutch portion, the contact area becomes quite small. Hence, the protrusions are easily plastically deformed due to friction resistance with the clutch portion. Therefore, resistance that obstructs the rotation of the clutch portion becomes small, and gas pressure can be efficiently supplied for the rotation of a take-up shaft.

Abstract: Shear ribs are formed at a bottom portion of a fitting hole of a spool for positioning a lock base, and respective end portions of the positioning portion abuts on a shear rib. Further, ribs are formed between the shear ribs. When the spool rotates in an unwinding direction with respect to the lock base, the end portion of the positioning portion deforms and breaks a shear rib, a rib and then another shear rib in that order. By being able to combine the effects of energy absorption due to deformation of the ribs with that of energy absorption due to twisting deformation of the torsion bar, a force limiter load immediately increases as soon as the spool starts to rotate.

Abstract: A webbing retractor having a force limiter mechanism whose energy absorption amount is large and which can reliably absorb energy. To this end, a wire is provided as an energy absorbing member having a fixing portion, a curved portion and a fit-in portion. When a spool rotates in a pull-out direction relative to a lock base, the fit-in portion is forcibly pulled-out from a fit-in hole and deformed while being strongly rubbed. Here, the fit-in portion deforms along an imaginary extended line of the curved portion. Thus, breaking of the wire due to concentration of shearing stress at one portion of the wire can be prevented. Deformation load which is applied to the wire can be reliably applied as force limiter load until a position of relative rotation of the spool with respect to the lock base which position is set in advance.

Abstract: A gear mechanism and webbing retractor having a compact size in which a pinion is prevented from being damaged when a large initial driving force is applied from a gear. When a sensor detects an emergent deceleration of a vehicle, a piston driving device is actuated so as to move a rack at its standby position in a direction to a pinion. When the rack is located at the standby position, a tooth face on a side near a front end, of a front end tooth thereof is in contact with a pressure receiving surface of the initially driving member. The rack is moved along a pitch line in the direction to the pinion so that the front end tooth presses the pressure receiving surface. As a result, the initially driving member converts the initial driving force from the rack to a rotation force thereby rotating the pinion in the taking-up direction.

Abstract: A guide pin is provided erect at a lock plate of a webbing retractor. A guide hole is formed in a V gear in correspondence with the guide pin. The guide hole is formed from a first hole portion, a second hole portion and a third hold portion. A state in which the guide pin is positioned in the first hole portion is an initial state. When relative rotation between the V gear and a spool arises, the guide pin moves from the first hole portion and reaches the second hole portion. In this process, the guide pin pushes the V gear so as to rotate reversely, and locking is cancelled. When a pushing force causing a V gear reverse rotation angle to exceed a set value is applied from the guide pin, the guide pin escapes into the third hole portion such that excessive pushing force is cancelled.

Abstract: In a webbing retractor, when a vehicle is in an emergency, a pretensioner mechanism supplies gas in a cylinder. A slider substantially closes a gas passing portion, and a piston thereby starts to move upward. A fitting portion pushes the slider upward so as to maintain the closure of the gas passing portion, and a webbing is taken up. When an energy absorbing member in a force limiter mechanism is deformed such that the webbing is pulled out, the piston is moved downward, the gas passing portion is opened by the slider so as to discharge the gas in the cylinder from the gas passing portion.

Abstract: In a webbing retractor having a pretensioner mechanism and a force limiter mechanism, when a drive member is rotated in one direction by the pretensioner mechanism, a cam plate is disposed at a sleeve side by an inner peripheral surface of a clutch ring. Thus, a roller engages with a sleeve, the sleeve is rotated integrally with the drive member, and a webbing is taken-up. When the sleeve is rotated in another direction by the force limiter mechanism, the cam plate is inserted into a recess portion of the clutch ring, and the cam plate is disposed at a side opposite to a sleeve side. Thus, rotation of the sleeve with respect to the drive member is permitted, and impeding of the pulling-out of the webbing can be prevented. Accordingly, a force limiter load can be determined by only a load required for deforming an energy absorbing member.

Abstract: A webbing take-up device and a vehicle are provided in which different force limiter loads can be selected at arbitrary times with a simple structure. A wire is inserted into a spool. One end portion of the wire is fixed to a lock base. Thus, when rotation of the lock base is impeded, a twisting load of a torsion bar and a drawing-through load of the wire are applied to a webbing as force limiter load. Further, a cutting gear is disposed between the spool and the lock base. When the cutting gear is rotated at an arbitrary time, the wire is cut. In this way, the force limiter load is reduced to only the twisting load of the torsion bar. As a result, different force limiter loads can be selected at arbitrary times with a simple structure.

Abstract: A webbing winding device having a pre-tensioner for tensioning a webbing for restraining a passenger in a passenger restraining direction in an emergency deceleration of a vehicle, comprising a winding shaft to which an end of the webbing is fixed and a gear train mechanism comprising a plurality of gears arranged in such a manner that adjacent gears mesh with each other, wherein a driving gear which receives an external driving force when the pre-tensioner is actuated is driven from a starting end position to a terminating end, position which are set in advance, so as to rotate the winding shaft in a direction for retracting the webbing, and when a driving of the driving gear is completed, at least a pair of adjacent gears are separated so as to enable the winding shaft to be rotated in the direction for retracting the webbing by inertial force.