FR2499189A1 - MECHANICAL ACTUATING DEVICE, IN PARTICULAR FOR DISC BRAKE WITH COMPLETE TRIMS FOR MOTOR VEHICLES - Google Patents

Abstract

THE INVENTION CONCERNS A MECHANICAL ACTUATION DEVICE, IN PARTICULAR FOR A DISC BRAKE WITH COMPLETE LININGS FOR MOTOR VEHICLES. THIS DEVICE INCLUDES TWO PRESSURE PLATES 1, 2 THAT CAN BE SPLIT FROM ONE OF THE OTHER, BY RELATIVE MOVEMENT, BY MEANS OF ROLLING BODIES 5 ROLLING ON OBLIQUE TRACKS 3, 4 HOLLOWED IN THE SAID PLATES. A COMMON CAGE 6 KEEP THE ROLLING BODIES IN POSITION. THIS CAGE CONTAINS, ON EACH SIDE OF THE ROLLING BODY, A FINGER 7, 8 ENGAGING WITH THE CORRESPONDING TRACK 3, 4 TO MAINTAIN THE CAGE IN A MIDDLE POSITION BETWEEN THE PLATES DURING THE MOVEMENT. THE INVENTION APPLIES TO DISC BRAKES WITH FULL LININGS.

Description

2 499189

  The invention relates to a mechanical actuation device, in particular for disc brakes with complete linings for motor vehicles, this device comprising two pressure plates which are opposite each other and which, by relative torsion, can be discarded. one of the other by means of rolling bodies which are arranged between the two plates and which run on oblique tracks, said rolling bodies being kept at a distance from each other by a common cage and being able to be displaced with respect to the cage in the direction of

spreading motion.

  In such a mechanical actuating device, a cage is needed which mutually connects the rolling bodies, in order to avoid that one

  of them remains behind when operating the brake. This provision

  sition allows the length of the oblique tracks to be limited to the path of angular displacement of the rolling bodies determined by the wear stroke (packing), because the cage prevents certain rolling bodies, which do not "carry" in the position initial, remain at their position

  initially on their oblique slopes during the movement causing the

  and thus may cause brake lock-up during

  rage, when the linings are worn.

  In a known complete brake disc brake,

  related to this type (German patent application DE-OS 26 32 541), the provision

  The mechanical operating system consists essentially of two pressure plates of the same configuration, between which the rolling bodies are on oblique slopes with an upward slope in the circumferential direction. The rolling bodies are connected to each other by a cage. This cage consists of two planar sheet metal rings which are connected to one another and which have common openings for receiving the rolling bodies. Sheet legs starting from the edges of the openings of the two sheet metal rings form braces around the rolling bodies which are thus also connected to the cage in the axial direction. The cage is thus worn on the rolling bodies. The manufacture of the cage from two sheet metal rings is expensive and complicated, and requires a free space in the region of oblique tracks

  arranged in the pressure trays.

  By the German patent application DE-OS 26 14 443, it is known in addition that the cage has three projections directed radially inwards towards the center of the brake, which are each fixed between two mutually parallel return springs and

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  oriented in the axial direction of the brake, these springs being hooked to pressure rings on both sides of the plates, so that the cage is maintained at its initial axial position in case of

  rotation of the pressure trays. This arrangement presents the Vincentian

  to be limited to a particular arrangement and form of

  return springs, as these must be mounted in a cinematic

  tically equivalent with the cage.

  The object of the invention is to provide the action device

  mechanical element of the type indicated, but in which the maintenance of the cage in a median position between the pressure plates is achieved simply and economically, and independently of the bodies

rolling and return springs.

  According to the invention, this is obtained by the fact that the cage has, on both sides, at least two projections which are arranged at a distance from one another and which are in engagement condition in an oblique slope of the plateau respective neighbor, these tracks which receive the salient slopes with a slope equal to that of the oblique tracks for the rolling bodies. Thus, in a simple manner, the cage is maintained at a precise median position between the pressure plates by its projections which slide along the oblique tracks, the rolling bodies then being maintained at a constant mutual interval. The cage consists of a sheet metal ring easy to manufacture, having circular openings through which the rolling bodies protrude. The mounting of the cage in the actuating device is extremely

simple and no problem.

  In an advantageous embodiment, each of the projections is engaged, with the possibility of sliding in an oblique track assigned to a rolling body, and is arranged in front of it, considering the direction of movement of the rolling body. relative to its oblique track during a movement causing the separation. This achievement is particularly appropriate because it allows to give up additional oblique tracks for guiding the cage. The very small additional length of the oblique tracks does not require any modification of existing machines and tools used to

  manufacture the actuating device.

  It is furthermore advantageous that, towards each of the two oblique tracks associated with a rolling body, a protrusion is directed, in order to avoid any catching or wedging of the cage between the two pressure plates. The cage thus receives an extremely stable guide which reliably keeps it at its median position between the two plates, this

  whatever the operating condition of the actuating device.

  Preferably, the longitudinal axis of the projections is disposed perpendicularly to the plane of the cage, so that there is substantially only holding forces directed perpendicular to the cage, which prevents blocking thereof. This avoids almost completely the creation of bending moments in the salient, which makes it possible to

  give them only small sections.

  It is advantageous for each projection to consist of a finger connected to the cage. These fingers can be, for example, fixed to the cage by screwing, gluing, press fitting or welding. In order that the force due to sliding friction between a protrusion and an oblique track is minimized, the end of this projection applied against the track is of spherical shape. Another simplification and a reduction in the cost price of the cage can be obtained if the projections are shaped by forming from the cage, for example by folding,

punching or stamping.

  The invention will be better understood and other features

  will appear with the following description and accompanying drawings

  o: - Figure 1 shows a partial sectional view of a mechanical actuating device in the relaxed position; and - Figure 2 shows a partial sectional view of the device

  mechanical actuation in the active position.

  The mechanical actuating device consists essentially of two circular pressure plates 1 and 2, arranged opposite one another, which, by a relative rotation, can be separated from each other. other by means of rolling bodies 5 which are arranged between the plates 1, 2 and roll on oblique tracks 3, 4. These rolling bodies 5 are kept at a distance from each other by a common cage 6. On the Figures 1 and 2, the rolling bodies 5 are shown in the form of balls. On each pressure plate 1, 2 are provided, parallel to the other oblique tracks 3, oblique tracks 4 to which

  protrusions 7, 8 of the cage 6 apply with the possibility of sliding

  ment. In Figure 1, the projections 7, 8 are made in the form of cylindrical fingers which are in holes 9, 10 of the cage 6 to which they are welded. The cage 6 has holes 11 which are traversed by the rolling bodies 5 which protrude. The diameter of

  holes It is slightly greater than the diameter of rolling bodies 5.

  When the actuating device is in the release position, the rolling bodies 5 are placed, next to the plate 1 and the plate side 2, against a shoulder 12, 13 whose surface is adapted to the rolling bodies 5. The rolling bodies 5 move in oblique tracks 3, 4 parallel to each other, which are formed as cylindrical concave surfaces whose diameters are slightly greater than those of the rolling bodies 5. The length of the projections 7, 8 must be chosen so that the cage 6 can not get caught between

the oblique tracks 3, 4.

  Of course, the described embodiment is in no way

limiting of the invention.

Claims (7)

  1. Mechanical actuating device, in particular for disc brakes with complete linings for motor vehicles, this device comprising two pressure plates which are opposite each other and which, by relative torsion, can be separated from each other. other by means of rolling bodies which are arranged between the two plates and which run on oblique tracks, said rolling bodies being kept at a distance from each other by a common cage and movable relative to the cage in the direction of the spacing movement, this device being characterized in that the cage (6) has, on both sides, at least two projections (7, 8) which are arranged at a distance from each other and which are each in condition of engagement in an oblique track (3, 4) of the respective neighboring plateau (1, 2), these tracks (3, 4) which receive the projections having a slope equal to that of the oblique tracks (3, 4) for rolling bodies.   2. Device according to claim 1, characterized in that each of the projections (7, 8) is engaged with the possibility of sliding in an oblique track (3, 4) assigned to a rolling body (5) and is arranged forward of it by considering the direction of movement of this rolling body (5) with respect to its oblique track (3, 4) during a movement causing the gap.   3. Device according to one of claims 1 or 2, characterized   in each of the two oblique tracks (3, 4) associated with   a rolling body (5) is directed a salient (7, 8).   4. Device according to any one of claims 1 to 3,   characterized in that the longitudinal axis of the projections (7, 8) is disposed   perpendicular to the plane of the cage (6).   5. Device according to any one of claims 1 to 4,   characterized in that the projection (7, 8) consists of a finger connected to the cage (6).   6. Device according to any one of claims 1 to 5,   characterized in that the end of a projection (7, 8) applied to a   oblique track (3, 4) is substantially spherical in shape.   7. Device according to any one of claims 1 to 6,   characterized in that the projections (7, 8) are formed by forming at from the cage (6).