DE2732241A1 - Sprung overload shaft coupling - has coaxial flanges to locate coupling balls by axial spring load and deflecting under excess load - Google Patents

Abstract

The coaxial shaft coupling includes a spring loaded overload clutch. The axial spring load on the movable coupling flange (4), is provided by an adjustable disc washer (5). The flange has a slide fit location on the shaft (1), coupled by four transmission keys (2). Four steel coupling balls (6) are located between the fixed (8) and the movable coupling flange. One flange has ball location holes (10) and the other has VEE-shaped radial grooves (14) at the same angular position. When an excessive torque is being transmitted, the flange with the VEE-grooves is deflected against the spring load.

Description

Adjustment drive with overload switching device "

The invention is based on an adjustment drive with one of one Motor driven shaft and an overload switching device with a non-rotatable and arranged axially displaceably on a division end of the divided shaft Switching ring, which by means of an adjustable spring means above Driving balls on one non-rotatable and axially immovable on the other end of the pitch the shaft provided pressure flange is supported and through which in the event of axial displacement against the action of the spring means, a motor switch can be actuated, the Driving balls evenly in the face on a circle concentric to the shaft distributed axial blind bores of the pressure flange or switching ring are held and the end face of the switching ring or pressure flange with a circular track Has locking recesses for the driver balls.

In the case of adjusting drives known from practice, this or a similar one Art have the circulatory path and the locking depressions seen in the circumferential direction regularly circular arc-shaped or V-shaped cross-section and the locking depressions seen in the radial direction circular arc-shaped cross-section.

This is very difficult to manufacture, at least only realize using complex processing machines and consequently makes such adjustment drives extremely expensive.

The invention is based on the object of a generic Adjustment drive to find a shape for the circular track with the locking depressions, which can be represented much more easily and cheaply without functional impairment is.

To solve this problem, the invention teaches that the locking depressions seen in the radial direction from V-shaped radial grooves in the otherwise flat, the Circulatory pathway forming End face exist.

The invention uses the knowledge that the driver balls on which the circular track having device part, d. H. the pressure flange or switching ring, do not require a guide in the radial direction, since they are anyway from the axial blind bores of the other device part both in the radial direction, and are held in the circumferential direction.

For this reason, in the adjustment drive according to the invention, the circle track outside of the locking depressions flat and in the plane of the end face arranged, while the locking recesses without radial limitation for the driver balls are only designed as V-shaped radial grooves of any length. This shaping can be produced very quickly with simple machines, so that the result Advantage of a considerable reduction in manufacturing costs is achieved.

According to a preferred, particularly easy-to-manufacture embodiment the radial grooves extend in the radial direction over the entire end face. Optimal load conditions are achieved when the two flanks of the radial grooves at right angles to each other and at an identical angle to the plane Are arranged end face. If you want different overload protection in the two directions of rotation of the shaft, other angular relationships will be achieved.

The invention is explained in more detail below with reference to a drawing. In a schematic representation: FIG. 1 shows a longitudinal section through an adjustment drive, Fig. 2 shows a section A-A through the object according to FIG. 1, FIG. 3 shows a detailed section B-B by the item of Fig. 2.

The adjustment drive shown has a motor driven Shaft 1 and an overload switching device.

For this purpose, 2 is rotationally fixed by means of a tongue and groove design as well axially displaceable on a division end 3 of the divided shaft 1, a switching ring 4 arranged. This switching ring 4 is by means of an adjustable spring means 5 in the form of a plate spring via driver balls 6 on a rotationally fixed and axially pressure flange 8 provided immovably at the other division end 7 of shaft 1 supported. By means of the switching ring 4 is opposite to the axial displacement Effect of the spring means 5, a motor switch 9 can be actuated.

The driver balls 6 are in axial blind bores 10 on the end face of the pressure flange 8 held on a concentric circle to the shaft 1 evenly are distributed. The maximum radius of the driving balls 6 protrudes from the axial blind bores 10 emerges. The end face 11 of the switching ring 4 has a circulatory path 12 Latching depressions 13 for the driver balls 6.

As can be clearly seen in the figures, these locking depressions exist 13 from V-shaped radial grooves 14 seen in the radial direction in the otherwise flat, the end face 11 forming the circulatory path 12. The radial grooves 14 extend in the radial direction over the entire end face 11. The two flanks 15 of the radial grooves 14 are at a right angle to each other as well as in an identical Arranged at an angle to the flat end face 11. The axial depth of the radial grooves 14 is dimensioned so that the switching ring 4 does not touch the pressure flange 8.

The mode of operation of the adjustment drive described results easy from the figures. If the shaft 1 is driven by the motor, take the Switching ring 4 and the pressure flange 8 via the axial blind bores 10 and radial grooves 14 lying driver balls 6 with each other.

If the torque to be transmitted exceeds a certain, the The value representing an overload case, which can be changed by adjusting the spring means 5 is, the driver balls 6 from the radial grooves 14 on the intermediate Circulatory path 12 rolled. The switching ring 4 moves against the effect of the Spring means 5 - fing. 1 to the right - off and actuates this switching ring 4 the Motor switch 9, which in turn switches off the motor or in its direction of rotation reverses. If the driver balls 6 get back into the radial grooves 14, this takes place again mutual entrainment of switching ring 4 and pressure flange 8.

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Claims (3)

Claims: tVerstellantrieb with a driven by a motor parts and an overload switching device with a non-rotatable and axially displaceable on a split end of the split shaft arranged switching ring, which mediates an adjustable spring means via driver balls on a non-rotatable as well as axially immovably supported on the other end of the division of the shaft provided pressure flange is and through which in the case of axial displacement against the action of the spring means a motor switch can be actuated, with the driver balls in the end face on a circle concentric to the shaft, evenly distributed axial blind holes of the Pressure flange or switching ring are held and the face of the switching ring or pressure flange a circular track with locking depressions for the driver balls has, d u r c h e k e n n n z e i c h -n e t, that the locking depressions (13) from V-shaped radial grooves (14) seen in the radial direction in the otherwise flat end face (11) forming the circulatory path (12). 2. Adjusting drive according to claim 1, characterized in that the radial grooves (14) extend in the radial direction over the entire length. 3. Adjusting drive according to claim 1 or 2, characterized in that that the two flanks (15) of the radial grooves (14) are at right angles to one another as well as in an identical one Arranged at an angle to the flat end face (11) are.