DE20020136U1 - Clutch and / or brake unit - Google Patents

Description

W:i-L HB-t Wed.&i. D.A US.

PATENT ATTORNEYS - EUROPEAN PATENT AND TRADEMARK ATTORNEYS

D-70174 STUTTGART HOSPITALSTRASSE 8 TELEPHONE (0711)228110 TELEPHONE (0711) 2281122

, , 24.11.2000

Applicant:

G13899

Stromag AG PW/wi

Hansastr. 120

59425 Unna

Clutch and/or brake unit

The invention relates to a clutch and/or brake unit with a drive part and an output part, which are aligned coaxially to a rotation axis and which are each provided with a toothing, wherein the toothings are located opposite one another in parallel radial planes relative to the rotation axis and can be connected to one another in a rotationally locking manner by an axial relative movement.

Gear couplings are generally known. Such a gear coupling has a drive part and an output part, each of which is mounted so that it can rotate about a common axis of rotation. The drive part or output part is mounted so that it can move axially. Both the drive part and the output part each have a toothing, with the toothings facing each other in parallel radial planes relative to the axis of rotation when the gear coupling is not engaged. The gear coupling can be designed as an electromagnetic coupling, so that the drive and output parts are moved axially towards each other by magnetic force. This causes the opposing toothings to engage, whereby the output part is driven along by the drive part in a rotationally locked manner.

φφφ φφ φ

» φφφ φφ φφφ

φ φ φ φφφ

•ΦΦ&phgr;&phgr;&phgr;&phgr; ·

The gears that mesh in the switched state have radially aligned teeth.

The object of the invention is to provide a clutch and/or brake unit of the type mentioned at the outset, which ensures improved power transmission at least in one direction of rotation of the clutch and/or brake unit.

This object is achieved in that the teeth of the gears are aligned obliquely in the direction of rotation with both a radial component and a directional component. This increases the transmittable torque of the clutch and/or brake unit in one direction of rotation compared to a gear clutch and/or brake provided with exclusively radially aligned teeth. The solution according to the invention is therefore particularly suitable for clutch and/or brake units in which a transmittable torque is only required in a single direction of rotation. The helical gearing can have straight teeth or teeth curved in the same direction. Thanks to the solution according to the invention, a smaller clutch or brake is sufficient to transmit the same torque in one direction of rotation compared to a purely radial gearing. The solution according to the invention is particularly suitable for locking mechanisms of large tool or production machine tools, such as plastics machines in particular.

In an embodiment of the invention, the teeth are curved in an arc shape in the direction of rotation. In a further embodiment, the gears are designed as palloid gears. This achieves a higher maximum transmittable torque compared to radial gears, depending on the direction of rotation.

Further advantages and features of the invention emerge from the claims and from the following description of a preferred embodiment of the invention, which is illustrated with reference to the drawings.

shows a longitudinal section through an embodiment of a brake unit according to the invention, wherein the unswitched rest state is shown in an upper half of the drawing and the switched power transmission state is shown in a lower half of the drawing,

Fig. 2 schematically shows a front view of the drive-side gearing,

Fig. 3 a front view of the output side gearing and

Fig. 4 is a sectional view of the gearing according to Fig. 2 along the section line IV-IV in Fig. 2.

An electromagnetic tooth brake, which represents a brake unit in the sense of the invention, has a brake body 1 as the drive part, which is provided with an electromagnetic coil (not specified in more detail). On the output side, the drive-side brake body 1 is assigned a brake flange 2, which is mounted so as to be axially movable. For this purpose, a membrane unit 5 is provided, to which the brake flange '2 is fastened. The membrane unit 5 is provided with an output part (not specified in more detail). The basic structure of such an electromagnetic tooth brake is generally known, so that it does not need to be discussed in more detail here.

In order to enable rotational engagement between the drive part and the driven part, i.e. between the brake body 1 and the brake flange 2, a toothing 3, 4 is assigned to both the brake body 1 and the brake flange 2. The brake body 1 and the brake flange 2 are aligned coaxially to a rotation axis D of the tooth brake. The toothings 3, 4 are also aligned coaxially to this rotation axis D.

·

·

·

·

t- 4· _<

tet, wherein the toothing 3 is fixed to the brake body 1 and the toothing 4 is formed in one piece on the brake flange 2. The toothings 3, 4 lie axially opposite one another on the front side, wherein the teeth of the toothings 3, 4 are arranged in radial planes parallel to one another - relative to the axis of rotation D, as long as the toothed brake is in its disengaged rest position according to the upper sectional view in Fig. 1.

By actuating the electromagnetic coil, the brake flange 2, designed as an armature disk, is pulled axially against the brake body 1, whereby the gears 3, 4 engage with each other.

As can be seen from Fig. 2 to 4, the gears 3, 4 are designed as helical gears in that the teeth 6 of the gears 3, 4 have a directional component running in the circumferential or rotational direction in addition to a radial component. In the present case, the helical gear formed in this way is designed by curved teeth 6, as can be seen from Fig. 2 and 3. The helical gear formed in this way is also referred to as palloid gear. The curvature of the teeth results in an increased contact of the tooth flanks in the switched functional state, i.e. with intermeshing gears 3, 4, whereby the transmittable torque is increased in one direction of rotation compared to a pure radial gear. In the other direction of rotation, the transmittable torque is correspondingly reduced, so that the tooth brake can only transmit a high torque in one direction of rotation. The tooth brake is therefore preferably suitable for use in one direction of rotation. Another area of application may arise if a clutch or brake unit is required that operates in different directions of rotation, but has to transmit different torques in these different directions of rotation.

..·· ·· · 13899.TXIiXX;

Claims (3)

1. Clutch and/or brake unit with a drive part and an output part, which are aligned coaxially to a rotation axis and which are each provided with a toothing, wherein the toothings lie opposite one another in parallel radial planes relative to the rotation axis and can be connected to one another in a rotationally locking manner by an axial relative movement, characterized in that the teeth ( 6 ) of the toothings ( 3 , 4 ) are aligned obliquely with both a radial component and a directional component in the direction of rotation. 2. Clutch and/or brake unit according to claim 1, characterized in that the teeth ( 6 ) are curved in an arc shape in the direction of rotation. 3. Clutch and/or brake unit according to claim 2, characterized in that the toothings ( 3 , 4 ) are designed as palloid toothings.