192 clutches and power-stop control – Clutches – Axially engaging
Patent
1992-09-08
1994-04-12
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192109F, F16D 1368
Patent
active
053017790
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to friction clutches.
A known friction clutch includes a driven plate and hub assembly in which the hub has a plurality of radially extending fingers on either side of a circular web, the fingers extending axially from the web, and two carbon driven plates which have a plurality of radially extending slots such that the driven plates can be mounted on the hub, one on either side of the web, the fingers engaging with the slots such that the driven plates can move axially relative to the hub, but rotational movement of the driven plates relative to the hub is limited. When the assembly is included in a clutch the hub is mounted on an output shaft and the driven plates are positioned axially between, and coaxially with, annular driving plates. When the clutch is disengaged allowing limited axial separation of the driving plates axial movement of the driven plates is limited by the driving plates and axial movement of the hub is limited by engagement of the web with the driven plates.
The hub for such an assembly is complicated and expensive to manufacture.
The present invention provides a multi plate friction clutch assembly including a plurality of driven plates spaced apart by driving plates and arranged on a hub having a plurality of axially extending splines on the outer surface thereof, which splines engage with engaging means on the driven plates for rotation of the driven plates with the hub, and locating means formed separately from the hub and located in a cavity in the hub so that the locating means is arranged in the gap between a pair of adjacent spaced apart driven plates to limit axial movement of the driven plates relative to the hub.
Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a section through a hub of an assembly according to a first embodiment of the invention;
FIG. is a section on line II--II in FIG. 1;
FIG. 3 is an elevation of a driven plate for use with the hub of FIG. 1;
FIG. 4 is a section on line IV--IV of FIG. 3;
FIG. 5 is a section through a friction clutch incorporating the hub of FIG. 1 and the driven plate of FIG. 3;
FIG. 6 is a section through a hub according to a second embodiment of the invention; and
FIG. 7 is a section through a hub according to a third embodiment of the invention.
Referring to FIGS. 1 and 2 a hub 8 comprises an inner cylindrical portion 10 having grooves 12 in the inner surface thereof for engagement with a driven shaft (not shown).
Extending radially outwardly from the inner cylindrical portion 10 is an annular portion 14. An outer cylindrical portion 16 is supported on the outer edge of the annular portion 14. The inner and outer cylindrical portions 10,16 are coaxial and the annular portion 14 joins each of the cylindrical portion at a circle which is axially central thereon.
On the outer surface of the outer cylindrical portion 16 are a plurality of uniformly spaced axially extending splines 18 which are uniform over the whole length of the outer cylindrical portion. The shape of the splines 18 will be referred to below. In the illustrated example there are 20 splines but that number could be varied substantially.
Through each of two adjacent splines 19,21 is formed a hole 22,24. The holes 22,24 are aligned so as to be coaxial with each other and so as to extend in a direction parallel to a line tangential to the hub 8. The holes 22,24 are nearer to one end 26 of the hub 8 than the other end 28 thereof. A roll pin 30 has each end located in one of the holes 22,24. The pin 30 is dimensioned such that its ends 32,34 are flush with or below the surface of the splines 19,21 in which it is located. The splines 33,35 next to those 19,21 through which the roll pin 30 passes have truncated surfaces 37,39 respectively to allow the roll pin 30 to be inserted.
Three further pins 36,38,40 are located in holes 42,44,46,48,50,52 in further pairs of adjacent splines 18 and the pins 30,36,38,40 are spaced evenly around the hub.
REFERENCES:
patent: 1573217 (1926-02-01), Zetwo
patent: 2174316 (1939-09-01), Dunkelow
patent: 2276416 (1942-03-01), Nutt
patent: 4425994 (1984-01-01), Schele
patent: 4846326 (1989-07-01), Tilton et al.
Automotive Products plc
Germain Lee A.
Lorence Richard M.
Milliken Paul E.
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