FR2522600A1 - BELT REEL, ESPECIALLY FOR MOTOR VEHICLE SAFETY BELT - Google Patents

Abstract

THE INVENTION RELATES TO A BELT REEL WITH AUTOMATIC LOCKING, IN PARTICULAR FOR A MOTOR VEHICLE SAFETY BELT, REEL OF THE TYPE INCLUDING A LOCKING SYSTEM SENSITIVE TO THE VEHICLE AND CONSTITUTES IN THE FORM OF A BALL DETECTOR OR PENDULUM. ELEMENT WHICH IS SENSITIVE TO ACCELERATION - BALL OR PENDULUM - MOVES A LEVER WHICH PENETS INTO THE LOCKING ELEMENTS OF A DISC DETERMINING THE BLOCKING OF THE BELT WINDING SHAFT WHEN THE DETECTOR ACTS. IN THIS REEL IS PROVIDED AN ELASTIC MATERIAL TO MITIGATE NOISE IN THE LEVER AREA. THE PROBLEM IS THE NOISE FORMING IN THE AREA OF POINT 17 OF LEVER 14; WHEN THERE IS SHOCKING, THE POINT OF THE LEVER INACT CLICK ON THE TOOTHED PERIPHERY OF DISC 18 DETERMINING THE LOCKING OF THE BELT WELDER SHAFT; THIS CLIQUETIS IS GENERATING. TO SOLVE THIS PROBLEM, WE USE A SOUNDPROOFING BODY CONSTITUTED IN FLEXIBLE MATERIAL 22, 27, ON THE PERIPHERY WHICH THE LEVER 14, 17, 24 STRIKES DURING ITS MOVEMENTS; THIS BODY IS MOUNTED ON AN ELEMENT 18, 25 NEXT TO THE LEVER.

Description

The invention relates to an automatically locking belt retractor, in

  particular for a motor vehicle seatbelt, comprising a vehicle-responsive locking system in the form of a ball or pendulum detector, wherein the ball-pendulum responsive member deflects a lever which penetrates into interlocking elements of a disk determining the locking of the winding shaft of the belt when the detector reacts, winder in which is provided an elastic material to attenuate the noise in the

lever area.

  In a belt winder known for its use and public notoriety, the tip of the lever which is deflected by the acceleration sensitive element is provided with a layer of an elastic plastic material, and this is in this case a shaped element in the form of a cap which constitutes the layer and forms itself the tip properly

  This is a disadvantage

  relatively important, although in this area of the automatic device minimum tolerances are prescribed and must be complied with Another drawback is that the shaped element shaped cap requires a particular tool Finally, the known soundproofing device can not not be mounted on an already existing reel because the ratios between the weights applied to the lever would then be modified, which would have consequences for

the value,&.

  The subject of the invention is a belt retractor of the type mentioned above and in which the soundproofing is determined at the level of the detector and without this detector needing to be modified as such in its constitution.

and in its mode of operation.

  For this purpose a soundproofing element, preferably of annular shape and elastic material and on the periphery which comes to strike the lever during its movements, is mounted

on a neighboring element of the lever.

  Thanks to the invention, the ring-shaped soundproofing member is a component separate from the sensitive parts of the detector, so that it is unnecessary to modify certain parts of the detector and we can now be assured of its accuracy without to take into account the soundproofing measures In addition, the invention advantageously avoids, for bodies provided for soundproofing, precise positioning dimensions, because unlike the current state of the art narrow tolerances are no longer Finally, the result is a significant decrease in the cost, while still achieving the desired goal. The appended drawing represents by way of examples two embodiments of the invention; they will be described with reference to this drawing in which Figure 1 shows a ball detector, and a fraction of a toothed disk for determining the locking of the winding shaft of the belt, the assembly being seen from the side and the lever of the detector being in the blocking position, FIG. 2 is a radial sectional view of the disk along the line II-II of FIG. 1,

  Figure 3 is a side view corresponding to the.

  Figure 1, the lever of the detector being out of its locking position, Figure 4 shows another embodiment, in a position identical to that of Figure 3, the lever is therefore outside its locking position, the FIG. 5 represents this second embodiment in a similar manner to FIG. 1, that is to say when the lever

is in the blocking position.

  In the first embodiment according to the Figures

  1 to 3, a ball detector (10) is fixed in the usual manner.

  the on the side wall (11) of a belt winder housing which is not shown The ball sensor is constituted by four components, namely a ball bowl

  (12); a ball (13), a lever (14) and a lever axis (15).

  The ball cup (12) comprises two vertical branches (16) between which the axis (15) of the lever (14) extends. This lever is pivotally mounted at one end and rests in its central zone on the ball (13) When, under the influence of acceleration forces acting on the whole device, the ball is moved from its central position in the bowl (12) and rolls laterally, the lever (14) is lifted. central position of the ball (13) is shown in Figure 3; FIG. 1 represents the position occupied by the elements of the ball detector (10) when the ball

  (13) is moved to the right.

  The lever (14) has a curved tip (17) adapted to engage the ring gear of a disk (18) mounted near the ball detector (10) and provided with teeth 19 so as to block the disc (18) so that it can not continue to rotate about its axis (20) This axis (20) is also the central axis of the tree of the belt winder which is not shown The disc (18), although this is not shown either, is advantageously connected to a locking member which blocks the winding shaft of the belt when the acceleration forces exceed a certain limit and may constitute a danger to the attached person, which could happen for example in case of accident The disc (18) with the teeth (19) is also used, in certain types of belt retractors, of inertia member for the sensitive locking system of the belt,

  and that is why it is also called a disk of inertia.

  Because the lever (14, 17) is not only light, but is also freely mounted on the axis (15) and the distance between the tip (17) of the lever and the disc (18) n is that of the order of magnitude of one-millimeter, it can form a noise, it is true light, but however unpleasant when for any reason such as a bad floor frequencies due to vibrations are transmitted to the detector (10) -In this case, the tip (17) of the lever is repeatedly and rapidly hit the periphery of the disc (18) and causes a rattling noise This phenomenon can also occur when the ball (13) is brought to jump into its bowl (12) The resistant material that must be used to constitute the lever (14, 17) and the disk (18) as a rule a synthetic material with a smooth surface

  and lasts maintains the formation of noise.

  To avoid this phenomenon, a thin ring of rubber

  rubber (22) is mounted in a peripheral forge (21) of the disc (18) (Fig 2); this ring has a circular section, and protrudes slightly on the periphery of the disk (18) so that the tip of the lever (17) does not strike the material

  disc (18) between the teeth (19), but the rubber ring

  The essential feature is that the rubber ring (22) protrudes outwardly relative to the teeth (19) and over a distance such that a meshing can remain. reliable between the pol * nte (17) of the lever and the teeth (19), with effective blocking

of the disc (18).

  As can be seen in Figure 2, the groove (21) for the rubber ring (22) is located outside the peripheral row of teeth (19), which makes it easier to

  in place of the rubber ring (22) during manufacture.

  The tip (17) of the lever has a width such that it passes as well on the rubber ring (22) as on the teeth (19) It is thus ensured both an attenuation of noise that blocking in this area , for all positions on the

periphery of the disk (18).

  Figures 4 and 5 show a second form of

  realization which is fundamentally analogous to the first.

  In this case also, there is provided a ball detector (10) and a ball cup (12), a ball (13) and a lever (14) having a tip (17), designed to come

  snap into the teeth (19) of an inertia disk (18).

  The lever (14) is mounted between the legs (16) of the housing, on an axis (15). In this second embodiment, the lever (14) comprises two arms (23, 24), the arm (231 applying on the ball (13) and being deflected by it when there are changes of acceleration, so that the tip (17) of the lever pivots in the opposite direction Thanks to this constructive arrangement, there is also in this embodiment the possibility of rattling noises, because the tip (17) of the lever can strike the bottom of the teeth on the periphery of the disc

(18).

  To exclude these noises, there is provided in this case an appendage (25) to the ball cup (12) of the detector (10)

  this appendix has a protrusion (26) forming a counter

  clearance on which is applied a rubber ring (27) of circular cross-section, which partially projects out of the projection (26) Because the element (25) is in the pivoting position of the lever arm (24) (14), in a position such that the arm (24) of the lever bears against the rubber ring (27) before the point (17) of the lever can come into contact with the periphery of the disc (18), The essential thing is that the teeth (19) protrude sufficiently beyond the lower position of the tip (17) of the lever so that the disc (18) is firmly locked by the

lever (14).

  The rubber rings (22, 27) can be put in place quickly, without incurring any expense worthy of mention, and this because of their elasticity, which is important economically for the manufacture. life of the rubber rings can be significantly lengthened by encapsulating them in a material not leaving

  light and thus avoiding a phenomenon of aging

  To suit the various types of belt retractors, rubber rings are available on the market.

  having the most diverse dimensions.

  In the embodiment of Figures 4 and 5, it is also possible to provide, instead of the rubber ring (27), a shaped element of annular or partially annular shape filling the same purpose and made from of an elastic material, solidified and brought to the fluid or pasty state, the appendage (25) of the detector (10) being

  for example immersed in an appropriate brain.

Claims (10)

  An automatic locking belt retractor, particularly for a motor vehicle seat belt, comprising a vehicle-responsive locking system in the form of a ball or pendulum detector, in which the sensing element is ball or pendulum acceleration   deflect a lever that penetrates into elements of   latching arranged in a disc determining the blocking of   the winding of the belt when the detector reacts,   in which an elastic material is provided to attenuate the noise in the zone of the lever, characterized in that   soundproofing element, preferably in the form of   nular and elastic material (22, 27) and on the periphery of which is struck the lever (14) during its movements,   is mounted on a member (18, 25) adjacent the lever (14).   Belt retractor according to claim 1, characterized in that the soundproofing element   ring (22, 27) has a circular section (ring ring).   3. Belt retractor according to the claims   1 and 2, characterized in that the ring-shaped soundproofing element (22) surrounds in a known manner the toothed disk (18) in the region of contact of the tip (17) of the lever (14), the arrangement and the diameter of the ring (22) being such that the active surfaces of the teeth (19) protrude the periphery of the ring (22).   4. Belt retractor according to claim 3, characterized in that the ring (22) is mounted in a groove   device (21) of the toothed disk (18), this peripheral groove   phérique being arranged near the row of teeth.   5 belt retractor according to claim 3, characterized in that the ring (22) is mounted between two rows of disc teeth (18).   6. Belt retractor according to claim 1, characterized in that the housing (12) of the detector in the water is mounted on the ball (13), or the pendulum, comprises a mounting bearing (25), which allows to exceed the periphery of the ring (27) in the pivoting zone of the lever (14) so that the lever (14), in the deflected position, comes by its tip (17) on the path followed by the teeth (19) of the toothed disc (18), but does not come into contact with the bottom of the teeth 7. Belt retractor according to any one of   Claims 1, 2 and 6, characterized in that the casement   (12) of the detector includes, below the pivot zone   lever (14), an undercutting appendix (25) on which the ring (27) is mounted, the periphery of the ring   (27) limiting the pivoting stroke of the lever.   Belt retractor according to Claim 7, characterized in that the appendix (25) is arranged on the side of the casing (12) of the detector, facing the toothed disc (18), and the ring (27) is mounted so that its outer generator is substantially tangent to the   corresponding edge of the lever (14) in the locking position.   9. Belt retractor according to any one of   Claims 1 to 8, characterized in that the element   ring-shaped soundproofing device (22, 27) consists of an elastomer, advantageously rubber, and that its support bearing (21, 25) is encapsulated   not to let the light through.   10. Belt retractor according to claim 1, characterized in that the soundproofing element is constituted by a solidified flexible material such as a material   synthetic which is brought to the fluid or pasty state.