JPS6323032A - Fluid friction clutch - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention has a rotatable housing filled with a viscous liquid, a shaft extending into the housing, and a plurality of outer shafts in the housing that are in toothed engagement therewith. A plurality of inner plates are provided which fit axially intermeshing between the plates and these outer plates, each of the two cooperating plates being provided with one of the holes and the other with a slit opening towards the edges of the plates. Related to liquid friction clutches.

[Conventional technology]

Recesses in the lamellas are known to increase the transmittable torque. However, it is not possible to provide all the sheets with slots that are advantageous for torque transmission. This is because the tongue remaining between the slits will then bend away from the thin plate surface and catch on the tongue of the adjacent thin plate. In each case, only one of the two cooperating laminae is provided with a slit, while the other has an outer edge or inner line that is closed by a simple hole. Until now, the inner lamellae had slits extending radially outwards and the outer lamellas had holes (
British Patent No. 1357106). Since the slits in the inner lamina extend inwardly for a relatively long time and a large number of such slits is desirable, the spacing between the inner edges of the slits is relatively small, so that the slits extend inwardly for a relatively long time. becomes significantly weaker.

In order to avoid breakage of the lamellas or strong twisting of the tongues remaining between the slits, the inner lamellas must have a suitable thickness, which increases the overall length and weight of the clutch.

Outer plates, especially for solid friction clutches, with slits are also known (US Pat. No. 3,025,686), but these slits emanate from the inner edges of the plates and are therefore difficult to manufacture. Furthermore, the tongues between the slits are loose within the sheet metal and therefore also have the risk of bending.

Finally, multi-plate clutches are known (DE 527 061) in which the outer sheet edges have slits which extend radially from both the outer and inner edges. However, this is not a liquid friction clutch, and the slits force oil between the horizontally overlapping thin plates when the clutch is disengaged.
Its only purpose is to avoid friction between the thin plates.

[Problem that the invention seeks to solve]

The problem underlying the invention is therefore to improve the most-mentioned liquid friction clutch in such a way that these drawbacks are eliminated and the weight and dimensions are reduced.

[Means for solving problems]

In order to solve this problem, according to the invention, the outer lamina has a closed inner edge and a slit that opens towards the toothed outer edge.

〔Effect of the invention〕

Since the inner lamella thus now has holes, a higher strength is generated from the beginning, and the perforated inner lamella can be made thinner than previously with slits. However, according to the invention, the outer lamella with the slit opening towards the outer edge is prevented from bending, since the free edge of the tongue remaining between the slits is gripped by the tooth mesh. Moreover, the number of slits can also be large, since the laminate cross-section between the inner ends of the slits is relatively far away from the outer edge teeth and therefore receives relatively small loads. Apart from this, the slits opening towards the outer edge do not pose manufacturing difficulties.

〔Example〕

An exemplary embodiment of the invention is shown in the drawing.

The liquid friction clutch has a rotatable housing 1 filled with viscous liquid, the drive and driven shafts of which are not shown.

A shaft 2 is inserted into the housing l. housing l
Inside, there is provided an outer lamella 3 which engages with teeth, and between these outer lamellas an inner lamella 4, which also engages with teeth, is provided on the shaft 2. The inner lamina 4 is provided with holes 5. On the other hand, the outer lamina 3 has a slit 7 which opens towards the toothed outer edge 6. These slits do not have to extend precisely radially. The slits may be inclined at acute angles to their respective radial directions. Of course, in FIG. 1 the sheets 3, 4 are shown much thicker than they actually are.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the axis of the liquid friction clutch, and FIG. 2 is a front view of its outer thin plate. l...housing, 2...shaft, 3...outer thin plate,
4... Inner thin plate, 5... Hole, 6... Outer edge, 7...
·slit.

Claims (1)

[Claims] a rotatable housing filled with a viscous liquid, a shaft extending into the housing, a plurality of outer lamellas toothed within the housing and a plurality of inner laminas axially interlockingly interlocked between the outer lamellas. in which the outer lamella (3) has a closed inner rim and a toothed outer rim, in which each of the two cooperating lamellas is provided with a hole and the other with a slit opening towards the lamina edge. A liquid friction clutch characterized in that it has a slit (7) that opens toward (6).