DE4120207A1 - Torsion free safety clutch with displaceable pretensioned balls - has fixed indentations and recesses with freedom of play produced by widening space between clutch halves - Google Patents

Abstract

The balls or other entrainment bodies are mounted at intervals along a coaxial circular track displaceable in recesses in one of the clutch bodies. The recesses (1) of the driving clutch body (2) and the disengaging indentations (6) in the driven clutch body (5) are formed exactly on a centre axis (7) at an angle to the centre axis (8) of the clutch. By moving the driving and driven clutch bodies axially (9) there is a stagger (11) between the active lines of the balls (3) and detent indentations which changes proportional with the distance. The distance between the pairs of indentations does not change but rather the distance between the balls since these are mounted in the recesses at an angle to the clutch centre axis and can thus only move axially at this angle. ADVANTAGE - Simplified mfg. process wherein the clutch is self-adjusting in the event of wear.

Description

The invention relates to safety couplings, ( Fig. 5) in which recesses ( 1 ) of the coupling body ( 2 ) with the slave body ( 3 ) (z. B. balls) are slidably mounted, which is under tension ( 4 ) (z. B. Spring), in the locking recesses ( 6 ) of the second coupling body ( 5 ) (mostly output side) are mounted and disengage when a certain torque is exceeded, which is state of the art.

To ensure freedom of play between the input and output side afford, it is necessary to produce both parts very precisely deliver, with a little play for easy disengagement the driver body is essential.

It is also known to offset the recesses To produce snap-in recesses so that there is no play to ensure whereby the production of such Ver binding is complex, since both coupling halves independent must be processed dependent on each other.

Due to this manufacturing inaccuracy, the load is share of the individual driver body different what has a negative impact on system rigidity.

According to the invention, this was achieved in such a way that the recesses ( 1 ) and the snap-in recesses ( 6 ) are usually produced in pairs in one setting ( FIG. 4), the central axis ( 7 ) of the recesses (usually a bore) being angled to the central axis ( 8 ) Safety clutch are brought in, which has a significant cost reduction in production.

The backlash is achieved by simply expanding the position ( 9 ) of the two coupling halves (drive ( 2 ) and output side ( 5 )) to each other, so that the coupling body is self-adjusting braced even when worn.

Furthermore, by increasing or decreasing this distance ( 9 ), the supporting portions of the driving body ( 3 ) recesses of the coupling body ( 1 ) and engaging recesses ( 6 ) can be optimally adjusted, which gives a good distribution of the surface pressure ( 10 ) and thus high system rigidity .

To be considered for the assessment of patentability pulling publications.

DE 29 34 164 A1
DE 30 09 224 C2
DE 32 08 182 A1
DE 37 32 753 A1
G 88 06 205 8

Name of the invention

backlash-free, torsionally rigid safety coupling

Fig. 1 sectional drawing of the safety clutch with typical mounting situation

Fig. 2 operating principle engaged

Fig. 3 operating principle disengaged

Fig. 4 Production of the recesses and engaging recesses Development of a piece of the circular path on which the torque is transmitted

Fig. 5 backlash-free wedging of the driver and clutch body, by simply adjusting the distance. Development of a piece of the circular path

Reference symbol list

1 recesses
2 coupling bodies on the drive side
3 driver bodies
4 preload (spring)
5 coupling body on the output side
6 snap-in recesses on the output side
7 Central axis / line of action of the driver body
8 coupling center axis
9 Distance between the input and output side of the safety clutch
10 Distribution of surface pressure
11 offset of the line of action of the driver bodies ( 7 ) to the center line of the latching recess ( 6 ) at a distance ( 9 )
12 Input and output side when machining in the clamped state
13 thrust bearings
14 toothed belt wheel
15 proximity switch for emergency stop signal
16 ball screw

description

The invention relates to a safety clutch according to the preamble of claim 1.

Safety couplings in which driver bodies are in shape from Z. B. balls or rollers in recesses of one Coupling body are slidably mounted and usually with Spring preload in the recesses of the other Coupling body are pressed, and thus a torque limited transmission have been known for a long time.

NC machine building places very high demands Safety clutches that are common with common solutions sufficient, or to be realized with high manufacturing costs are.

Main requirements of such security systems are exact freedom of play, high torsion stiff, precise positioning accuracy when re-entering couple and inexpensive manufacture.

Are known for. B. Solutions according to claim OS 37 32 753 A1, where the recesses, which are called guides of the Coupling bodies serve, from the locking recesses around distinguish such an amount that a rotational Bracing against each other is achieved.

However, the input and output side of this clutch must be ge are made separately, which is expensive and is inaccurate. Uniform load shares of the coupling body cannot be guaranteed.

With this solution, freedom of play is only at the expense of Torsional stiffness is achieved because of the support arm of the coupling body uneven and usually only reached in spots will.  

The object of the invention is to provide a safety clutch to create that through

• a) a simple manufacturing process
• b) high backlash and torsional stiffness
• c) accurate re-engagement enables
• d) has high load-bearing components and system rigidity and
• e) self-adjusting when worn.

The object is achieved by the characterizing Features of claim 1 solved. In the following words and image descriptions, the invention is for example explained.

As with all safety couplings of this type, the driving coupling body with axially attached Aus operations carried out in which driver bodies (in us erem example balls) are slidably mounted. The With slave body are in the engaging recesses of the ge driven clutch body z. B. biased with spring force.

According to the invention, it is now proposed that the recesses ( 1 ) ( Fig. 4) of the coupling body ( 2 ) and the Einrastver recesses ( 6 ) of the other coupling body ( 5 ) in one setting in the prestressed state ( 12 ), for. B. by drilling or milling a groove so that the lines of action of the driver body are executed at an angle to the central axis ( 8 ).

The offset to the coupling center axis is approx. 2-5 °.

When assembling the coupling there is a clearance ( 9 ) between the input ( 2 ) and output ( 5 ) coupling body. The distance between the pair of snap-in recesses ( 6 ) does not change, but the distance between the 2 × driver bodies does, since they are mounted in recesses ( 1 ) made at an angle to the coupling center axis ( 8 ) and can only move axially at this angle .

The difference becomes greater the greater the distance ( 9 ) is set by positioning the axial bearing ( 13 ).

It has a positive impact on system rigidity, though the recesses in pairs in opposite directions leads are.

Furthermore, this ensures the correct re-engagement guaranteed.

With this solution are not only rotary, but also linear security systems can be implemented. (e.g. on train rods and linear guides).

Through the safety clutch designed according to the invention the following improvements to existing solutions enough:

• 1. Cost-effective manufacturing through simple manufacturing method.
• 2. Due to the possibility of production in one setting results in the highest load ratings of the driver bodies, which results in high system rigidity.
• 3. Freedom of play results from the system Assembly, the load-bearing component of the driver body, is adjustable by changing the distance.
• 4. The driver bodies do not have to be tight in the guides be fitted, but can be easily movable.
• 5. By arranging the Carrier on the circular path is a high angular loyal click position reached.

Claims (1)

Safety clutch with one driving and one driven via this coupling body and a number ent along a coaxial circular path at intervals arranged driver body, which are slidably mounted in recesses of a coupling body, and for torque transmission with pneumatic, hydraulic and mechanical-spring-elastic force in Locking depressions are biased, the locking recesses being so geared that, in the event of overload, the driver bodies are lifted against the biasing force, characterized in that the recesses ( 1 ) of the driving coupling body ( 2 ) and locking recesses ( 6 ) of the driven coupling body ( 5 ) Exactly on a central axis ( 7 ), which are attached at an angle to the central axis ( 8 ) of the safety coupling and, by moving the driving ( 2 ) and driven ( 5 ) coupling bodies in the axial direction ( 9 ), an offset ( 11 ) from the line of action ( 9 ) the driver body ( 3 ) and engaging recesses ( 6 ) occurs, which changes proportionally with the distance ( 9 ) ver, so that the force-loaded driver body ( 3 ) are rotationally braced against each other to the extent that the distance ( 9 ) is changed.