Rotation device with a sealing plate

A sealing arrangement in a clutch for disposing between driving and driven parts of a mechanism, the driving part being adapted to rotate the driven part, the clutch including:

• a substantially cylindrical inner member adapted to be drivingly connected to the driven part of the mechanism;
• a substantially hollow cylindrical outer member coaxially and rotatably disposed on the inner member and adapted to be drivingly connected to the driving part of the mechanism, the outer member having front and rear end portions, the front end portion substantially fitting around the inner member, the rear end portion being spaced from the inner member so that an inner space receiving a lubricating agent is defined by the inner member and an inner face of the rear end portion, the inner space opening to a rear end face of the outer member;
• means for drivingly connecting and disconnecting the outer and inner members to each other;
• and an annular extension extending rearward from an outer periphery of the rear end face of the outer member, the annular extension having an annular groove circumferentially formed therein, said annular groove having an opening facing radially inward, the groove having front and rear internal walls defining the groove, the front wall being located closer to the rear end face of the outer member than is the rear wall;
• the sealing arrangement including a substantially annular sealing plate, which rotatably fits around the inner member and fixedly fits in the annular extension, for closing the opening of the inner space and for aligning the axes of the outer and inner members with each other, the sealing plate comprising:
• an annular plate body having one and the other faces and covering the opening of the inner space with the one face thereof in contact with the rear end face of the outer member;
• an annular peripheral wall extending rearward away from an outer periphery of the other face of the plate body;
• and
• an annular ridge extending from the peripheral wall and protruding into the groove of the annular extension so that the annular ridge is firmly engaged with at least the rear wall of the groove of the annular extension and so that the one face of the plate body is firmly attached to the rear end face of the outer member so as to hermetically seal the inner space, the rear end face of the outer member and the front wall of the groove defining a distance therebetween which is at least equal to the thickness of the plate body of the sealing plate.

A sealing arrangement, comprising:

• an inner member;
• an outer member coaxially and rotatably disposed on said inner member, said outer member having a front end portion fit around said inner member, said outer member having a rear end portion spaced away from said inner member so as to define an inner space therebetween, said outer member having an opening to said inner space;
• an annular extension projecting from an outer periphery of said outer member;
• sealing means for hermetically sealing said inner space and for keeping axes of said inner and outer members aligned with each other, said sealing means including a plate body closing said opening, said plate body being against said rear end portion;
• a peripheral wall extending from an outer periphery of said plate body;
• means for engaging said peripheral wall with said annular extension, said plate body being free of deformation caused by a stress that arises from engagement of said peripheral wall with said annular extension, said engaging means including a ridge protruding into a groove and engaging against a wall of said groove, said groove being on said annular extension, said ridge extending from said peripheral wall, said outer member having a rear end face to which said inner space is opened, said wall of said groove which is engaged by said ridge being a rear wall, said groove also having a front wall spaced from said rear wall and which is closer to said rear end face of said outer member than is said rear wall, said front wall and said rear end face of said outer member defining a distance therebetween which is at least equal to a thickness of said plate body.