CS269671B1 - Connecting element for no-torque transmission of torque - Google Patents

Abstract

The connecting element is designed for connecting torque-transmitting shafts that require a rigid and backlash-free connection and that have limited design dimensions and assembly accessibility to secure the connection. It is especially suitable for connecting multiple concentric shafts and hollow shafts of large diameters with limited space for assembly. The connecting element is formed by wedge bushings that are pressed against the walls of the grooves created in the connected shafts. The compressive force is derived by the driving element and multiplied by the wedge-shaped yard stones.

Description

(57) The fastener is intended for the coupling of torque-transmitting shafts requiring a rigid and free-wheel connection and where the design dimensions and mounting accessibility are limited to secure the connection. It is especially suitable for joining multiple concentric shafts and large diameter hollow shafts with limited space for assembly. The connecting element is formed by two wedge bushes which are pressed against the walls of the grooves formed in the connecting shafts. The pressing force is exerted by the tightening element and multiplied by the two blocks of the wedge shape.

Γ-

O c \ o

(Z) o

FIG.1

CS 269 671 SI

The invention relates to a coupling element by means of which two torque transmitting shafts can be coupled, whereby a clearance or a bias is created at the coupling point according to the requirements of the construction of the device. The coupling element is suitable for precisely positioned shafts in which a high rigid connection is required at minimum coupling dimensions and in inaccessible places, mainly from the axial direction. '

The prior art fasteners and couplings utilize different principles for joining two shafts, for example by means of a tongue, a pin, a wedge, a spline shaft, screw connections and the like. Some examples of joints have the following drawbacks: Some types of joints make it difficult to ensure the jointlessness of the joint, others require machining and assembly, some require high precision manufacturing or expensive tooling, and many couplings require large design dimensions and accessibility when assembling from all sides.

These drawbacks are solved by a connecting element, the principle of which is to press the wedge sleeve against the walls of the grooves of two connected shafts by means of wedge-shaped stones, whereby the force for pressing the stones is exerted by a suitable tightening element, e.g. screw.

With this connection, a backlash-free torque transmission is provided; the production of the grooves of the two shafts is sufficient in routine precision by milling; the axial mounting displacement of the shafts relative to each other is possible; assembly is very simple, with little space required to insert and tighten the fastener from the direction perpendicular to the shaft axis.

In FIG. 1 is a cross-sectional view of the coupling element at the point of contact of the two shafts in the transverse direction; FIG. 2 is a cross section through the shafts and coupling element in the longitudinal direction, and FIG. 1 is the joining of hollow shafts of larger diameters by a plurality of connecting elements.

The connecting element is formed by two wedge bushes 4, which are supported by their planar surfaces on grooves 2, which are formed in the input and output shafts 1 and 4. The force required to engage the shafts and transmit the torque 9. 3 ^{e is obtained} by means of a tightening element which presses two wedge-shaped stones 2, which multiply the effects of the tightening element 2 and evenly distribute the thrust to the wedge sleeve surfaces and groove surfaces. is inserted through the mounting hole T formed in the housing 2 into the shaft grooves and tightened to a prescribed torque.

The coupling element can advantageously be used for coupling multiple coaxial shafts for which a rigid and clearance-free connection is required, for example, an industrial robot's wrist gears in which the drives are located at the opposite end of the arm and in devices where different types of connection cannot be used.

Claims (2)

OBJECT OF THE INVENTION 1. A non-backlash torque transmission element characterized in that both the drive shaft (1) and the drive shaft (2) have grooves (3) in which two wedge bushes (4) are inserted between which there are two stones (5) pressed by the tightening element (6). Connection element according to Claim 1, characterized in that one of the stones (5) is provided with a direct fastening by means of a tightening element (6).