Belt retractor
AssigneeTRW Repa GmbH
InventorArtur Fohl
Life of this patent
Estimating the term…
Abstract
The belt retractor is provided with a vehicle-sensitive and webbing-sensitive locking mechanism. At the two side faces of the belt coiling shaft in each case two locking pawls are pivotably mounted eccentrically thereto. They are each biased by a return spring into their rest position out of engagement with the teeth of a housing-fixed ratchet toothing member. The locking pawls are each mounted in their center of gravity. The webbing-sensitive locking takes place solely under the action of inertia forces.
Claims21
A belt retractor for a motor vehicle safety belt restraining system comprising a housing, a belt coiling shaft rotatably mounted in said housing and a vehicle-sensitive and webbing-sensitive locking mechanism, said locking mechanism having a ratchet toothing member fixed to said housing and a pair of locking pawls pivotably and eccentrically mounted on a side face of said belt coiling shaft and which are biased by a return spring into a rest position out of engagement with the teeth of said ratched toothing member and are mounted for pivotal vehicle-sensitive movement into locking engagement with the teeth of said ratchet toothing member under the action of a cam member which is rotatable relatively to said belt coiling shaft and is provided at its outer periphery with control teeth which cooperate with a control pawl drivable by a vehicle-sensitive sensor, each of said locking pawls being mounted in its center of gravity and the webbing-sensitive locking taking place solely under the action of inertia forces occurring upon sudden acceleration of said belt coiling shaft, and said locking pawls having engagement faces which are offset with respect to each other in the peripheral direction of said belt coiling shaft by an angle which corresponds to a fraction of the pitch of the teeth of said ratchet toothing member.
A belt retractor for a motor vehicle safety belt restraining system comprising a housing, a belt coiling shaft rotatably mounted in said housing, and a vehicle-sensitive and webbing-sensitive locking mechanism, said locking mechanism having a ratchet toothing member fixed to said housing and a pair of locking pawls pivotably and eccentrically mounted on each side face of said belt coiling shaft, each locking pawl being biased by a return spring into a rest position out of engagement with the teeth of said ratchet toothing member and being mounted for pivotal movement into locking engagement with the teeth of said ratchet toothing member, each locking pawl on one side of said belt coiling shaft being rigidly interconnected with a corresponding locking pawl on the other side of said belt coiling shaft by means of a rod rotatably supported in an axial bore of said belt coiling shaft, a cam wheel being mounted rotatably with respect to said belt coiling shaft and provided at its outer periphery with control teeth which cooperate with a pilot lever drivable by a vehicle-sensitive sensor, each of said locking pawls being mounted in its center of gravity so that a webbing-sensitive locking takes place solely under the action of inertia forces occurring upon sudden acceleration of said belt coiling shaft, and said control wheel being provided with cam means for engagement of at least one pair of said locking pawls for vehicle-sensitive movement of said locking pawls into engagement with said ratchet toothing member upon relative rotary movement between said control wheel and said belt coiling shaft, and said locking pawls of each pair having engagement faces which are offset with respect to each other in the peripheral direction of said belt coiling shaft by an angle which corresponds to a fraction of the pitch of the teeth of said ratchet toothing member.
Dependencies are inferred from the claim text.