Kabushiki Kaisha Tokai Rika Denki Seisakusho

Shinji Mori

Fuminori Komiya

Teruhiko Koide

Tomonori Nagata

Takuhiro Saito

Keiichi Tamura

Katsuki Asagiri

Shingo Izuchi

Akira Sumiyashiki

Kenji Matsui

Tomonari Umakoshi

Takahiro Osaki

Teruhiko Kawaguchi

Hiroshi Tsuge

Yasuho Kitazawa

Hiroaki Shinto

Hitoshi Takamatsu

Fuminori Teraoka

Kozi Buma

Tomonori Kimura

Tosio Saitou

Toshimasa Yamamoto

Yuji Nishimura

Masakazu Hashimoto

Takashi Kawaharazaki

Takayuki Ando

Mitsuaki Katsuno

Kazuhiko Aihara

Akinori Fujiwara

Yasutaka Watanabe

Tetsushi Muromachi

Koki Sato

Masaki Yasuda

Takashi Ogasawara

Shuichi Harada

Takeo Matsui

Soichi Katsuyama

Satoshi Kurata

A webbing retractor that can alleviate the load on a reducing balance spring without increasing cost and weight is obtained. When a ring inertially rotates in a retraction direction together with a ratchet gear, a ring-side pressing portion of a load receiving portion accommodating portion formed in the ring presses a spring-side load receiving portion of a clutch spring in the retraction direction. Due to this, the clutch spring is loosened, whereby the ring can easily inertially rotate in the retraction direction together with the ratchet gear, and the load acting on a reducing balance spring can be alleviated.

Webbing retractor

A webbing take-up device which can improve the workability of the assembly work of a tension reducer is obtained. In this webbing take-up device, a take-up spring unit is arranged closer to the opening side of a case than a reduction spring unit within a case. For this reason, when a clutch is arranged inside the reduction balance spring and the inner end of the reduction balance spring in a spiral direction is locked to a spring case of the clutch, the clutch and the reduction balance spring can be easily and visually recognized from the opening side of the case. Thus, the other end of the reduction balance spring can be easily locked to the spring case.

Webbing take-up device

In a V-sensor of a webbing take-up device, concave portions are formed in supporting walls of a supporting member having a spring property, and peak ends of a rotating shaft of a sensor pawl gets into the concave portions, and the rotating shaft is thereby supported by the supporting walls. Cone-shaped concave portions come into contact by pressure with the cone-shaped peak ends of the rotating shaft due to the elasticity of the supporting walls, and therefore, when the rotating shaft attempts to be displaced in the axis direction thereof and in a direction orthogonal to the axis direction of the rotating shaft, the elasticity of the supporting walls withstand displacement of the rotating shaft. As a result, occurrence of a rattle of the rotating shaft, that is, the sensor pawl can be prevented or restrained.

A webbing winding device includes a clutch mechanism interposed between a spool and an output shaft of a motor and has a simple structure and high operability. In an interference piece that has an interference portion interfering with a connection pawl when an input gear of a clutch is rotated in the winding direction, a base portion is disposed between an outer retaining ring and an inner retaining ring formed at a gear box, and the base portion comes into press contact with an inner peripheral portion of the outer retaining ring and an outer peripheral portion of the inner retaining ring. The interference portion keeps interfering with the connection pawl until a pressing force more than a maximum static frictional force generated between the inner peripheral portion of the outer retaining ring and the outer peripheral portion of the inner retaining ring, and the base portion is applied to the interference portion, thereby rotating the connection pawl.

Webbing winding device

To obtain a webbing take-up device that can not only transmit to a take-up shaft only rotation from a motor by a clutch but is also simple and compact. A clutch of this webbing take-up device has a simply configuration where slidersof a clutch body portionare caused by frictional force to be retained in a case, whereby the slidersand lock barsare caused to relatively move and the lock barsare caused by this relative movement to move to positions where they engage with or disengage from a ratchet. Consequently, the overall configuration of a clutchcan be made significantly compact (thinned) in comparison to a configuration that causes a pawl to move using an inertial disk that is large and has weight as in a conventional clutch. Thus, the overall configuration of a webbing take-up devicecan be made compact.

A webbing retracting device that may prevent entering of an end-lock state when a spool rotates in the pull out direction on rebound just after completion of taking up of the webbing belt. A restriction weight is provided on a V gear. The restriction weight moves in the pull out direction relative to the V gear by acceleration when the V gear is rotated in the take up direction, and furthermore, the restriction weight pivots about a support pin under centrifugal force due to rotation of the V gear and attains a contact position. In such a state, even if the inertial mass attempts to displace toward the lock activation direction, the restriction weight interferes with the inertial mass and restricts displacement of the inertial mass toward the lock activation direction.

Webbing retracting device

To obtain a webbing take-up device that can not only transmit to a take-up shaft only rotation from a motor by a clutch but is also simple and compact. A clutch of this webbing take-up device has a simply configuration where slidersof a clutch body portionare caused by frictional force to be retained in a case, whereby the slidersand lock barsare caused to relatively move and the lock barsare caused by this relative movement to move to positions where they engage with or disengage from a ratchetConsequently, the overall configuration of a clutchcan be made significantly compact (thinned) in comparison to a configuration that causes a pawl to move using an inertial disk that is large and has weight as in a conventional clutch. Thus, the overall configuration of a webbing take-up devicecan be made compact.

In a motorized retractor, due to an ECU and a driver switching a speed of rotation of an output shaft of a motor to a first speed or a second speed, a transfer path of rotational force from the motor to a spool is switched to a first driving force transferring section (a path through a meshing clutch and a slip mechanism) or a second driving force transferring section (a path through an overload mechanism and a centrifugal clutch). Accordingly, there is no need for a complex switching mechanism including a solenoid which is employed in conventional motorized retractors. A device can thereby be made more compact.

Motorized retractor

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 take-up device includes: a spool to which a base end portion of a long band-like webbing belt is attached and which is rotatable such that the webbing belt can be taken up and pulled out; and a rotating body that is coaxially relatively rotatable with respect to the spool. A coupling member, which causes the rotating body to rotate in a pullout direction together with the spool rotating in the pullout direction of the webbing belt when the coupling member is directly or indirectly engaged with the spool, is disposed on the rotating body. The webbing take-up device also includes: a lock member that regulates the rotation of the spool; acceleration detecting unit that is actuated when a vehicle disposed with the webbing take-up device abruptly decelerates; rotation detecting unit that is actuated by the abrupt rotation of the spool in the pullout direction and causes the coupling member to move to a position where the coupling member is engageable with the spool; and regulating unit that engages with the coupling member when the webbing belt has been taken up and accommodated onto the spool and regulates the displacement of the coupling member toward the engageable position.

A clutchof the present webbing retractor has a gear wheeland spring claws, and has peripheral direction load receiving portionsat the gear wheel, and load from the spring clawsis applied along a peripheral direction via the peripheral direction load receiving portions. Therefore, compactness and weight reduction of the clutchcan be aimed for. Further, the clutchhas a ring, and the ringintegrally has a cover portionholding respective clutch structural members at predetermined assembly positions, and the spring claws, and is held integrally with a rotorby elastic forces of the spring claws. In this way, the respective clutch structural members can be temporarily held (sub-assembled) integrally.

A motorized retractor which includes a spool with a webbing wound therearound, a reversible motor, a forward and a reverse driving force transmission mechanisms. The forward and the reverse driving force transmission mechanisms are provided between the spool and an output shaft of the motor, respectively. The forward driving force transmission mechanism reduces forward rotation of the output shaft by a predetermined reduction ratio and transmits this rotation to the spool for rotating the spool in a winding direction. The reverse driving force transmission mechanism reduces reverse direction rotation of the output shaft by a reduction ratio which is lower than the predetermined reduction ratio of the forward driving force transmission mechanism, and transmits this rotation to the spool for rotating the spool in the winding direction. The forward and the reverse driving force transmission mechanisms both block transmission to the output shaft of rotations generated at the spool side.

A webbing retractor for an elongated, strip-shaped webbing belt used for application to a body of a vehicle occupant riding in a vehicle. The webbing retractor has: a frame in which a pair of leg plates, which are disposed so as to face one another, are connected by a back plate so as to be integral; a spool which is disposed between the pair of leg plates, one end of the webbing belt being anchored to the spool; a driving mechanism which is disposed between the pair of leg plates and has an output shaft and which is for rotating the spool in at least a take-up direction; and a clutch disposed between the pair of leg plates, transmitting rotation of the output shaft to the spool. Because a motor and gears can be disposed between the leg plates of the frame, the webbing retractor can be made compact.

A webbing retractor has two torque transmitting routes for taking-up, such that rapid and reliable taking-up, and gentle taking-up are possible. When an engaging claw of a pawl restricts rotation of a ratchet plate, due to planetary gears rotating around a sun gear, rotation is transmitted from a drive gear to a carrier plate. On the other hand, when restriction of rotation of the ratchet plate is released, a clutch spring tightens around a tube portion of the carrier plate while rotation of the drive gear pulls one peripheral direction end of the clutch spring in a direction of rotation thereof. Frictional resistance between the tube portion and the clutch spring is increased, and rotation is transmitted from the drive gear to the carrier plate.

Growing community of inventors

Aichi-ken, Japan

Shinji Mori