Kabushiki Kaisha Tokai Rika Denki Seisakusho

Kazuhiko Aihara

Tomonori Nagata

Masaki Yasuda

Hitoshi Takamatsu

Yasuho Kitazawa

Toshio Nakashima

Katsuki Asagiri

Shinji Mori

Akira Sumiyashiki

Teruhiko Koide

Takuhiro Saito

Masaru Ukita

Fuminori Komiya

Takashi Ono

Tomonori Kimura

Kenji Gotou

Shuichi Harada

In a webbing retractor, due to operation of a pretensioner mechanism, a stopper wire is moved, and second lock pawls of a second lock base mesh-together with an inner ratchet of a lock ring. In this way, a limit load by a torsion shaft can be switched to a high load. Therefore, immediately after operation of the pretensioner mechanism, the limit load by the torsion shaft can be made to be to the high load, and the limit load can be made to be the high load at an early stage.

Webbing retractor, method of controlling webbing retractor, and vehicle

In a webbing winder, when a webbing belt is wound around a spool, a V gear is rotated in a winding direction together with a W pawl, a friction spring, and a contact member, thereby generating a frictional force between the contact member and a sensor holder. As a consequence, the friction spring and the contact member are located at a restriction position, so that the friction spring engages with an engaging surface of the W pawl. Therefore, even if the spool and the V gear are rapidly and slightly rotated in a withdrawal direction in reaction when the webbing belt is completely wound by the spool, the W pawl cannot mesh with a ratchet gear formed at the sensor holder due to the restriction of oscillation of the W pawl, thus preventing any end lock.

Webbing winder

A webbing take-up device comprising: a take-up shaft that takes up a webbing belt; a metal frame that axially supports the take-up shaft; and a lock mechanism comprising a lock plate that blocks rotation in the pullout direction of the webbing of the take-up shaft by engaging the take-up shaft directly or indirectly. The lock plate is formed by performing press-punch and press-bend processing on a metal plate and has a connecting portion formed so that one end side thereof is continuous with a lock, which engages the take-up shaft. The connecting portion spans between one side and the other side of the frame.

Webbing take-up device

A webbing retractor is provided that reduces the amount of webbing that is pulled-out after operation of a pretensioner mechanism. In a webbing retractor, a lock pawlis set in a non-meshable state in which it cannot mesh with a lock gear. At a time when a pretensioner mechanismoperates and a clutch platerotates in a take-up direction, a lock stopperrotates together with the clutch plateand releases engagement with the lock pawl. Therefore, the lock pawlis rotated by a compression coil springand changed to a meshable state. In this way, immediately after rotational force in a pull-out direction is applied to the lock geardue to load from a vehicle occupant after operation of the pretensioner mechanism, the lock pawlmeshes with the lock gear, and pulling-out of a webbingis impeded. Therefore, an amount of the webbingwhich is pulled-out can be reduced.

Webbing retractor, webbing retracting method, and vehicle

A webbing take-up device () is disclosed, wherein a motor () is provided directly below a take-up shaft () between a pair of leg plates () with a rotary shaft () of the motor () disposed perpendicularly to the take-up shaft (), and a clutch () is provided at one side of one leg plate (). Further, a gear () of a motor gear portion () is removably connected to a worm gear () in a clutch gear portion (), and a mounting stay () is detachably attached to a case () with screws (), so that the motor () and the motor gear portion () can be detached independently of the case () while still being assembled together. Still further, a pretensioner mechanism () and a sensor mechanism () are provided at one end side of a spool (), and an urging mechanism () is disposed at the other end side thereof.

A webbing winding device includes a spool, a pair of leg plates, a torsion shaft, a first locking mechanism, a second locking mechanism, and a control mechanism. A webbing belt is wound onto the spool. The two leg plates oppose one another in an axial direction of the spool. The torsion shaft is provided passing through the spool and deforms when a torque is applied to the spool. The first locking mechanism, at the side of one of the leg plates, restricts rotation of the spool in an unwinding direction. The second locking mechanism, at the side of the other of the leg plates, switches from a lock-release state to a locking state, and restricts rotation of the torsion shaft in the unwinding direction. The control mechanism is provided passing through the spool and causes the second locking mechanism to switch into the locking state.

Webbing winding device

In a pretensioner device, engaging teeth of a pinion (rotating body) have first projections which project-out toward the other side in the peripheral direction of a cam portion. Meshing claws of a clutch plate have second projections which project-out toward a one side in the peripheral direction of the cam portion, and whose gear portion side end surfaces face the first projections. In a state before operation of the pretensioner device, movement of the clutch plate toward one side in the axial direction with respect to the pinion is restricted due to the second projections engaging with the first projections. Accordingly, in the pretensioner device, in the state before operation, even if some type of external force is applied to the clutch plate, positional offset of the clutch plate toward the one side in the axial direction with respect to the pinion can be prevented.

Pretensioner device

A webbing retractor which can prevent gas, which is for rotating a take-up shaft in a take-up direction, from affecting other structural parts. In the webbing retractor, when a pretensioner mechanism operates, gas for operation within a cylinder is exhausted toward a pinion via a gas venting hole formed in a flange portion of a piston. Because a blocking wall is provided between the pinion and an acceleration sensor, exhausted gas passes between the pinion and the blocking wall, and is exhausted to an outer side of the webbing retractor from an upper end side of a cover plate or the like. In this way, blowing-out of the exhausted gas onto the acceleration sensor is blocked, and the exhausted gas can be prevented from affecting the acceleration sensor.

Webbing retractor

A fixture is disclosed which can reliably attach an attachment member, such as a cylinder, to an attachment site, such as a frame. The fixture includes a fixing portion, which faces the attachment site at the side of the attachment site and is fixed to the attachment site, and a contact portion, which is disposed at the side opposite from the attachment site, with the attachment member therebetween. The contact portion is integrally coupled to the fixing portion, point-contacts or line-contacts the attachment member, and is configured to push the attachment member to the attachment site in a state where the fixing portion is fixed to the attachment site. A webbing take-up device including this fixture is also disclosed.

Fixture and webbing take-up device

A webbing take-up device is disclosed which includes a take-up shaft onto which a webbing is mound, and a mounting member nondetachably mounted to the take-up shaft by screw tightening. The take-up shaft and the mounting member are engaged with each other at a portion other than a portion where the screw tightening is carried out, thereby preventing relative rotation of the take-up shaft and the mounting member.

A pretensioner device in which, at a time of rapid deceleration of a vehicle such as a collision, a gas generator generates gas and the pretensioner device moves a piston in a direction of tensing a webbing. When, due to delayed detection by an acceleration sensor, the gas generator operates after a stretch-out load has been applied to a wire, high-pressure and high-temperature gas within a gas chamber contacts a guard pipe, which is formed of a material having a high thermal conductivity and is disposed within the gas chamber, and is cooled, and passes through a clearance and a pin hole communicating regions to a front and rear of the piston, and is discharged into a cylinder.

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.

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.

Growing community of inventors

Aichi-ken, Japan

Kazuhiko Aihara