Clutch seal with fluid operated check valve

  • US 3,880,266 A
  • Filed: 11/20/1973
  • Issued: 04/29/1975
  • Est. Priority Date: 11/23/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. A fluid actuated clutch assembly comprising:

  • a. a rotary structure of substantially annular shape secured to a shaft for rotating therewith, said rotary structure having a groove formed on its radially outer periphery, b. a stationary structure of substantially annular shape received within the annular groove of said rotary structure at a spacing therefrom for allowing relative rotation of said rotary structure and for forming a space in between, c. two substantially annular sealing pistons mounted in said stationary structure and slidable in the longitudinal direction of said shaft of rotation, said sealing pistons being biased away from the inner side walls of said annular groove and movable, upon application of a fluid pressure thereto, against the biasing force for bringing their extending ends into sealing contact with said inner side walls of said groove in the rotating structure to form a closed chamber in said space, d. an inflatable friction element affixed to the rotating structure, e. a passage formed in said rotary structure communicating the interior of said friction element with said closed chamber, f. a one-way valve mounted in said rotary structure radially inside at least one of said sealing pistons and connecting said chamber with said passage, said one-way valve having its valve member biased into a first position for blocking communication between said chamber and said passage, g. an actuating piston mounted in said rotary structure substantially in alignment with said one-way valve and slidable in said longitudinal direction, said actuating piston being biased away from said one-way valve, h. a substantially annular discharging piston mounted in said stationary structure in a manner to have one side facing said actuating piston, said discharging piston being slidable in said longitudinal direction and biased away from one of said inner side walls, said discharging piston being movable, upon application of a fluid pressure thereto, against the biasing force for bringing said one side thereof into abutting engagement with the actuating piston to move said piston and said valve member against the biasing forces into a second position in which the communication between said chamber and said passage is allowed, and i. means for selectively supplying the working fluid to said closed chamber and a working fluid both to said sealing pistons and to said discharging piston in accordance with a predetermined sequence.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×