Takata Corporation

Joyson Safety Systems Japan K.k.

Yuichiro Hodatsu

Hiroshi Tomita

Miguel Pruneda

To provide a seat belt retractor and a seat belt apparatus in which contact between a locking base and a base frame can be suppressed. A seat belt retractor includes a spoolthat retracts a webbing restraining an occupant, a base framethat accommodates the spoolwhile allowing the spoolto rotate, and a lock mechanismregulating rotation of the spool. The lock mechanismincludes a locking basedisposed at an end portion of the spool, an openingthat is formed in the base frameand allows the locking baseto be inserted therethrough, engagement teethformed at an inner edge of the opening, and a pawlthat is disposed radially outwardly movable relative to the locking baseand engageable with the engagement teeth. The lock mechanismfurther includes a protect coverthat is attached to the locking baseand includes a side wall portiondisposed along a side surface portion of the locking base

Seat belt retractor and seat belt apparatus

To provide a seat belt retractor and a seat belt device capable of shortening time taken to restrict rotation of a spool. A seat belt retractor according to the present invention includes a spool, a base frame, a spring unit, a vehicle sensor, a locking mechanism, and a pretensioner. The locking mechanismincludes a lock gearand a retainer. The lock gearincludes an outer circumferential wallthat is disposed at an end portion of the spooland engageable with the vehicle sensor. The retainerincludes an inner circumferential walldisposed on the inner side of the outer circumferential walland a side wallthat defines a space accommodating the lock gear. The lock gearbecomes engaged with the inner circumferential wallor the side wallof the retainerwhen the lock gearbecomes eccentric relative to the retainer

Seat belt retractor and seat belt device

To provide a seatbelt retractor and a seatbelt device that can suppress the occurrence of abnormal noise. A seatbelt retractorincludes a spoolthat retracts webbing configured to restrain an occupant, a base framethat houses the spoolrotatably, and a lock mechanismthat restricts rotation of the spool. The lock mechanismincludes a locking base, a pawl, a pawl spring, and a lock gear. The pawlincludes a first restraint portionthat restrains movement of the pawlin one rotating direction of the spoolwhile being located inside an outer periphery of the locking base, and a second restraint portionthat restrains the movement of the pawlin an opposite rotating direction of the spoolwhile the movement is retrained by the first restraint portion

A plurality of driving force transmitting members, a piston, a spring and a gas generator are inserted into the pipe from the end of the pipe where the gas generator is mounted. The gas generator is press-fitted in the pipe while the flat faces thereof are deformed by a pair of protrusions of the pipe. Accordingly, the gas generator is temporarily held by the protrusions of the pipe. Then, one end of the pipe is firmly pressed and the gas generator is mounted in the pipe.

Pretensioner, seat belt retractor, and seat belt device

A ring gearof a pretensionerincludes a plurality of leversand one arc-shaped stopperto allow force transmission members to smoothly move in a pipe, to facilitate setting of a stopper for stopping rotation of a ring gear, and to reduce the cost with a simple structure. During operation of the pretensioner, the leversare sequentially pressed by ballsto rotate a pinionand a spool in a seatbelt retracting direction. When the ring gearrotates by a predetermined rotation amount, an outer peripheral edgeof the stoppercontacts and presses the opposing ball. Since the ballis thereby clamped between the stopperand an inner peripheral surface1 of a pipe I, the ring gearis stopped.

Pretensioner, seatbelt retractor including the pretensioner, and seatbelt apparatus including the seatbelt retractor

There is provided a pretensioner. The pretensioner includes: a pipe; a gas generator that generates a gas in the pipe in an emergency case; a gas generator mount on which the gas generator is mounted; a spool driving mechanism that rotates a spool in a direction to retract a seatbelt by the gas generated by the gas generator in the emergency case; a discharge hole formed in the pipe so as to allow communication between inside and outside of the pipe; and a blocking member configured to block the discharge hole from inside of the pipe, the blocking member being configured to open the discharge hole when the blocking member is pressed from outside of the pipe with a pressing force equal to or greater than a given pressing force.

Pretensioner, seat belt retractor with pretensioner, and seat belt unit including seat belt retractor

A pipe includes a cutout portion through which levers of a ring gear enter the pipe. An inner peripheral surface of the pipe opposing the cutout portion includes a curved inner peripheral surface in a curved portion of the pipe, a linear inner peripheral surface in a linear portion of the pipe, and a transition portion from the curved inner peripheral surface to the linear inner peripheral surface. The transition portion is located closer to a position where balls start to press the levers of the ring gear, than an intersection where an imaginary straight line &#x3b1; extending from a cutout end portion of the cutout portion intersects an imaginary extension line of the inner peripheral surface of the linear portion of the pipe at a right angle.

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Tokyo, Japan

Yuichiro Hodatsu