DE3218245A1 - Play-free, torsionally rigid, flexurally elastic coupling - Google Patents

Abstract

The invention has the aim of producing a play-free, torsionally rigid and flexurally elastic coupling, by use of a circular or annular membrane, or shear-stressed or tension-stressed rods or straps which are fitted as torque-transferring elements between two coupling hubs, and which are produced from a plastic having a fibre content of at least 60%, the element or elements serving for torque transfer being connected by means of a screw or plug connection to the driving or driven hub of the coupling halves.

Description

"Backlash-free, torsionally rigid, flexible coupling"

The application relates to a backlash-free, torsionally rigid, but flexurally elastic Coupling according to the preamble of claim 1.

Nerartire couplings are known in various types, e.g. Toothed couplings, membrane couplings, etc.

With the known gear couplings, even when new is a light one There is play due to the manufacturing tolerances in hobbing and broaching or butting the toothing, only with special manufacturing effort or afterwards Treatment methods, tooth couplings can also be manufactured backlash-free when new will. However, in operation are also initially due to special manufacturing effort or through complex post-treatment methods, backlash-free tooth couplings with a Backlash between the teeth of both coupling halves is affected by stress and abrasion due to insufficient lubrication and maintenance.

The game or the game change has a particularly disadvantageous effect then off when the angular velocity is between the power machine and the work machine for the purpose of regulating is tapped, and both parts of the system therefore have different angular velocities respectively; Have angular accelerations.

In addition, tooth clutches that are initially manufactured without play are also used even with slight angles between the two coupling halves, which is shown in a production can never be completely ruled out, a play, because the gear planes of the two coupling halves form an angle to each other. As a consequence, that there is play between the teeth is practically only in the final state still wear two teeth. In order to take account of this interference, this is the case reduce excessive torque; the more, the greater the angle of diffraction is.

Even with coaxial installation of such couplings, whereby to compensate different angular speeds between input and output coupling clutches must be used, there arises the need to reduce the transmitted Torque.

The maintenance sensitivity increases with increasing angular deflection. The necessary maintenance, lubrication, relubrication, oil and grease changes are provided represents an operational disadvantage in the case of tooth clutches. This applies in particular for tooth clutches that are lubricated with grease and run at high speeds, whereby the speed separates the components of the lubricating grease (after oil and saponification) occurs. The angular mobility of the tooth coupling becomes strong constricted.

Membrane couplings are also named, which are made up of three components are marked (two driving and driven coupling halves, as well as the one in between Membrane), which the introduced torque mostly by frictional engagement, occasionally transferred by form fit. Due to the shape of the components of this coupling type they remain maintenance-free and absolutely free of play, regardless of the operating conditions.

This angular mobility of these membrane couplings comes through the Flexural elasticity of the materials used for the torque-transmitting parts, that is, the membrane disks.

The disadvantage of the materials used so far is the elastic limit of metallic building materials for the sake of achieving a long service life allow only a low flexural elasticity. This flexural elasticity limits the Apply these clutches to about 0.5 grand per clutch half. The combination multiple membranes etc. to multiple systems increases the ability of the transmission of torques, however, the bending elasticity decreases in such a way that only a fraction of it this can be realized between input and output, so that the angular movement sinks. Another disadvantage is that when using multiple systems for maintenance the life of the flexible elements these membranes into several membranes need to be divided. Furthermore, they are necessary for the transmission of high torques The necessary alloys of ferritic building materials for the flexible membranes are notch-sensitive. If, for example, two membranes are used one on top of the other, the surfaces become shifted against each other by the deformation caused by the bending, which is at higher frequencies (higher speeds) to local temperature increases and thus leads to fretting corrosion (seizure). f) The service life of such components is decreasing Depending on the notch factors of the erosion imperfections, notch-sensitive materials.

The previously known coupling systems, made of ferritic Materials can only overcome this disadvantage by separating the individual, flexible ones Avoid links with intermediate layers, spacer plates or similar.

In addition, some couplings are known in which the flexurally elastic Links are made from thermoplastic materials. These material groups however, have low physical strength values, i.e. low tensile and flexural strength and low permissible ambient temperatures, as a result of which the structural dimensions increase and the possibility of use is limited.

The present invention has set itself the task of providing a backlash-free, To create torsionally rigid and flexible coupling while avoiding the disadvantages the known designs can transmit a sufficiently high torque and at an absolute zero backlash even after long operating times, works maintenance-free and a high flexural elasticity between input and output and a light and self centering assembly and disassembly ensured.

This is achieved with the characterizing features of claim 1.

The membrane is made of a material with a high proportion of fiber inserts produced which are intimately connected by impregnation with a resin. About the shaft hubs the torque is transmitted by means of frictional engagement, the friction factor that of steel usually 0.14 is increased to about 0.3 in the present invention.

This results, in particular, in the dimensioning of such Couplings have considerable advantages by reducing the overall dimensions and the for the frictional connection required screw connections.

Another feature is the transmission of torques Serving element made of tension and pressure straps, which are located in the coupling hubs on the input and output sides are clamped.

According to a further inventive advantage, the torque-transmitting Provide components at the clamping points with reinforcements to reduce the surface pressure lead.

According to a further inventive feature, the holes are the the torque-transmitting components with bars to achieve an untensioned Provide a plug connection between the connector pins on the shaft hub sides.

dachfrageJenå is a preferred embodiment of the invention explained in more detail with reference to the accompanying drawing.

In the drawing, Fig. 1 shows the cross section through a circular ring Membrane and FIG. 2 shows the plan view of such a membrane according to the cross section of Figure 1.

Figure 1 shows the cross section of an annular membrane 1 with the bore 2 serving for input or output and the bore 2 serving for output or drive Hole 3.

At these holes 2, 3 are the reinforcements (soffits) 4 and 5 provided.

Figure 2 shows the front view of this circular membrane 1 with the bores 2, 3, which serve alternately for the input and output of the torque to be transmitted.

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Claims (4)

P a t e n t a n 5 p r ti c h e CS Torsionally rigid, slit-free and flexible Coupling characterized in that a circular or annular membrane Made of fiber-reinforced synthetic resin with a fiber content of more than 60 7o between clamped in the shaft hubs of conventional materials on the input and output side is. 2. Coupling according to claim 1, characterized in that the torque Transmission element made of fiber-reinforced plastic in the form of tension and pressure straps Clamped between shaft hubs made of conventional materials on the input and output side is. 3. Coupling according to claim 1 or 2, characterized in that the the torque transmitting components at the clamping points reinforcements to reduce the surface pressure (hole reveal) in the direction of the center line of the screw connection of the components. 4. Supplun £ according to one or more of the preceding claims characterized in that the holes of the Torque transmitting Components with bushings to achieve an untensioned plug connection between Driving pins of the shaft hub sides and the torque transmitting elements enables.