초록 ▼

The invention relates to a safety belt arrangement in vehicles having a belt tensioner comprising: a holder which is to be secured to the vehicle chassis, with a belt winding reel with a safety belt wound thereon being rotatably mounted on the holder; a belt retraction spring arrangement by means of

The invention relates to a safety belt arrangement in vehicles having a belt tensioner comprising: a holder which is to be secured to the vehicle chassis, with a belt winding reel with a safety belt wound thereon being rotatably mounted on the holder; a belt retraction spring arrangement by means of which the safety belt is continuously lightly pretensioned in the draw-in direction so that it only loosely lies against the vehicle occupant secured by it; and an auxiliary drive which is separated drivewise by a clutch from the belt winding reel but is activated abruptly with an accident-dependent acceleration and is rotationally fixedly coupled to the belt winding reel via the then engaged clutch. The auxiliary drive has two band running chambers separated by sealing walls and two draw bands which are each arranged in one band running chamber, with the draw bands being secured at one end to a housing and at the other end to a drive reel and being acted on by the pressure source in the event of an accident-dependent acceleration of the vehicle in order to drive the drive reel which is fixedly connected to the belt winding reel in the belt draw-in direction. In accordance with the invention, the clutch is accommodated in a hollow coupling cavity provided in the drive reel.

대표청구항 ▼

[ What is claimed is:] [1.] A safety belt arrangement in motor vehicles having a belt tensioner comprising:a holder to be secured to the vehicle chassis, with a belt winding reel with a safety belt wound thereon being rotatably mounted on the holder;a belt retraction spring arrangement by means of w

[ What is claimed is:] [1.] A safety belt arrangement in motor vehicles having a belt tensioner comprising:a holder to be secured to the vehicle chassis, with a belt winding reel with a safety belt wound thereon being rotatably mounted on the holder;a belt retraction spring arrangement by means of which the safety belt is continuously lightly pretensioned in the drawing direction so that it only loosely lies against the vehicle occupant secured by it;a fixing arrangement, in particular between the belt winding reel and the holder on the vehicle chassis, which, on suddenly pulling on the belt and/or with an accident-dependent acceleration, blocks the safety belt against being pulled out;an auxiliary drive connected via a clutch to the belt winding reel, the auxiliary drive being normally separated drivewise by the disengaged clutch from the belt winding reel, but being activated abruptly with an accident-dependent acceleration and being rotationally fixedly coupled to the belt winding reel via the then engaged clutch in order to reel up the safety belt by a length such that the safety belt lies tightly against the vehicle occupant before the vehicle occupant secured by it falls into the safety belt;with the auxiliary drive having:a pressure source, in particular a pyrotechnical pressure source, which can be triggered or ignited with an accident-dependent response of an acceleration sensor and which, on being triggered, abruptly builds up a high pressure in a pressure space;a torque generating device acted on by the pressure in the pressure space; anda drive shaft or a drive reel connected to the torque generating device which is rotationally fixed connected to the belt winding reel via the clutch,wherein the torque generating device has at least one flexible draw band, in particular consisting of spring steel, which is secured at the one end, at a first mounting point, to the circumference of the drive shaft, or to a drive reel concentrically mounted thereon, and is partially wound onto the drive shaft or onto the drive reel, and is secured at the other end, at a second mounting point, to the peripheral wall of a band running chamber disposed within a housing and arranged around the drive shaft or the drive reel with the housing including an end wall portion adjacent the belt reel,wherein the band running chamber has a width corresponding to the width of the draw band, in such a way that the draw band, which divides the band running chamber into two partial spaces sealed off from one another, extends through the band running chamber,wherein the partial space, which brings about an unwinding of the draw band from the rotating shaft or drive reel when subjected to pressure, is connected to the pressure space and the other partial space is vented, andwherein, for the decoupling of the partial spaces pressure-wise, at least one sealing wall is provided between the housing and the periphery of the drive shaft or of the drive reel concentrically mounted thereon, or the flexible draw band wound thereon,the drive shaft, or the drive reel, containing a hollow coupling space, the peripheral wall of which is formed as a rotary engagement surface and in which a rotary clutch member rotationally fixedly connected to the belt winding reel is concentrically arranged, with its peripheral wall being formed as a clutch engagement surface; andan intermediate space between the rotary engagement surface and the clutch engagement surface in which coupling elements which are normally out of engagement with the clutch engagement surface are arranged which produce a rotationally fixed coupling engagement between the rotary engagement surface and the clutch engagement surface when the drive shaft or the drive reel starts a rotary process in the event of triggering of the pressure source,wherein the coupling elements are coupling pins which are radially movably held, which extend axially into the intermediate space and which stand at least approximately in contact with the rotary engagement surface and also move radially inwardly against the clutch engagement surface on the start of their rotation in the case of a triggering of the pressure source and are clamped or latched between the rotary engagement surface and the clutch engagement surface in such a way that a rotationally fixed coupling engagement is present between the rotary engagement surface and the clutch engagement surface, andthe coupling pins are releasable relative to their holder with a predetermined loading during a triggering, and in particular are designed to be sheared off, and the coupling pins are initially releasably mounted in the end region axially remote from the housing end wall portion in mounting recesses of a centering ring which is rotationally fixedly connected to the drive shaft, or to the drive reel, and are axially subsequently in peripheral engagement with fixed abutment surfaces of the housing in such a way that, on the start of rotation of the drive shaft, or of the drive reel, and on co-movement of the coupling pins caused thereby, the mounting of the coupling pins at the centering ring is released and the coupling pins come into an angular position relative to the centering ring where they are displaced radially inwardly towards the clutch engagement surface.