Wet type clutch/brake device mounted in a flywheel

Claim 1

In an assembly of the type including a fixed machine body, a shaft mounted for rotation with respect to said body, a flywheel mounted about said shaft for rotation with respect thereto and for rotation with respect to said body, brake means operable when engaged to prevent rotation of said shaft relative to said body and operable when disengaged to enable rotation of said shaft relative to said body, and clutch means operable to be engaged when said brake means is disengaged to transmit rotation of said flywheel to said shaft and operable to be disengaged when said brake means is engaged to interrupt transmission of rotation of said flywheel to said shaft, the improvement comprising: a recess formed in said flywheel and extending axially from an open end thereof spaced from said body to a closed end adjacent said body, said shaft extending coaxially through said recess, said reces defining an annular chamber between said shaft and said flywheel; a cover member closing said open end of said recess, said cover member being fixed to said flywheel and rotatable therewith; said brake means comprising an annular brake hub fixed to said shaft within said recess adjacent said closed end thereof, said brake hub having outer peripheral teeth, an annular brake housing fixed to said body and positioned within said recess at said closed end thereof, said brake housing having inner peripheral teeth surrounding said outer peripheral teeth of said brake hub, a plurality of inner friction plates engaged with said outer teeth of said brake hub, and a plurality of outer friction plates engaged with said inner teeth of said brake housing, said inner and outer friction plates being arranged alternately between and in engagement with each other; said clutch means comprising an annular clutch hub fixed to said shaft within said recess adjacent said cover member, said clutch hub having outer peripheral teeth, an annular clutch housing fixed to said flywheel and positioned within said recess adjacent said cover member, said clutch housing having inner peripheral teeth surrounding said outer peripheral teeth of said clutch hub, a plurality of inner friction plates engaged with said outer teeth of said clutch hub, and a plurality of outer friction plates engaged with said inner teeth of said clutch housing, said outer and inner friction plates being arranged alternately between and in engagement with each other; a cylinder member surrounding said shaft between said clutch means and said brake means within said annular chamber of said recess, said cylinder member having first and second opposite axial annular ends directed toward said friction plates of said brake means and said friction plates of said clutch means, respectively, for alternate abutment therewith; a piston member positioned radially with said cylinder member and defining therewith a cylinder chamber; spring means positioned between said clutch hub and said cylinder member for biasing said cylinder member in a first axial direction toward said friction plates of said brake means and away from said friction plates of said clutch means, and thereby for engaging said brake means and disengaging said clutch means; an air passage extending through said shaft and connected to said cylinder chamber; means for supplying compressed air through said air passage into said cylinder chamber for moving said cylinder member against the force of said spring means in a second axial direction toward said friction plates of said clutch means and away from said friction plates of said brake means, and thereby for engaging said clutch means and disengaging said brake means; and means extending through said cover member for supplying oil into said recess for cooling said brake means and said clutch means.