192 clutches and power-stop control – Clutches – Operators
Patent
1985-12-05
1988-12-20
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 7011, 192 7013, 192 703, 192 94, F16D 1360, F16D 1900
Patent
active
047920297
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a clutch arrangement for providing disengageable drive between co-axial shafts.
According to the invention, there is provided a clutch arrangement for co-axial shaft members, one of which is a drive or input shaft member and the other of which is a driven or output shaft member. The arrangement includes an annular disc concentrically mountable on one of the shaft members and rotatable with that one member, and a plate member projecting at least diametrally of the other shaft member in substantially parallel relationship with the disc. The plate member has at least two openings therethrough, in each of which is provided a respective force applying arm extending therethrough parallel to the clutch axis; with each of those arms being inter-connected by a frame member. The clutch arrangement further includes respective friction pad means on each side of the disc; the respective pad means being operatively mounted such that, on application of an axial force to the frame member, the axially extending arms are movable to cause each of the pad means to move relative to the disc from one to the other of respective positions in a first one of which the pad means grip the disc for rotation of the shaft members in unison and in the second of which the pad means release the disc so the drive or input shaft member is rotatable relative to the driven or output shaft member.
The shaft members may be co-axial shafts. Alternatively, one shaft member may be a shaft, with the other member being a sleeve mounted on one end of the shaft and extending beyond that end to enable a second shaft to be coupled to the one shaft in end to end relation. With this alternative in mind, the description hereinafter will refer t the co-axial shaft members simply as shafts, for ease of description.
The clutch arrangement of the invention is such that, with the pad means in their position in which they release the disc, the one shaft and the disc thereon are rotatable relative to the other shaft, the plate member, the axially extending arms and the frame member. However, with the pad means in their position in which they grip the disc, the arrangement is such that both shafts, the disc, the plate member, the axially extending arms and the frame member all are rotatable in unison.
The clutch arrangement of the invention is of simple construction, enabling it to be built in a robust, inexpensive form. Also, it is able to be dismantled readily for servicing such as to replace worn pad means. The clutch arrangement is adaptable to a wide variety of applications and can be installed for a low cost compared with conventional clutches. Also, compared with conventional clutches, such as of the type disclosed in U.S. Pat. No. 3,199,646, they for example are more compact, and have higher torque capabilities, permit higher rotational speeds, and have lower inertia loads.
Thus, one commercially available clutch of the type disclosed by that U.S. specification of 15 inch diameter, and a clutch arrangement according to the invention of 10 inch diameter provide the following comparative data:
______________________________________ Characteristic Prior Art Invention
______________________________________
Maximum revolutions 1200 rpm 2400 rpm
Maximum torque (at 80 psi air
18,000 lb 34,000 lb
pressure)
Maximum Horsepower transmitted
150 560
Pad means replacement
Total Slip in new
Dismantling
pads
______________________________________
Also, the clutch according to the invention can be made and installed at
less than half the cost for the prior art device; while clutch arrangement
of the present invention can be readily provided in a form normally
engaged by spring action with actuator release, if required, while the
prior art device can not without very extensive modification.
The clutch arrangement of the invention has a wide range of applications. The arrangement is particularly well suite to use as a steering clutch for tracked vehicles, particularly snow-traversing vehicles, because of
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Bonck Rodney H.
Testardi David A.
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