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Steering control unit
| Details |
Inventors: Uppal, Sohan L.;
Assignee: Eaton Corporation (Cleveland, OH)
Primary Examiner: Michalsky; Gerald A.
Assistant Examiner:
Attorney, Agent or Firm: Kasper; L. J.
A fluid controller (11) of the type comprising a rotatable spool valve (31) and a relatively rotatable follow-up sleeve valve (33), in which fluid flows through a fluid meter (15) of the type in which a star member (39) orbits and rotates as fluid flows through the meter (15). The rotation of the star (39) is transmitted to the sleeve valve (33) to provide follow-up movement thereto. In accordance with the present invention, the star (39) defines a set of internal teeth (41) and a terminal portion (42) of the sleeve valve (33) extends axially into the star and defines a set of external teeth (43), in driven engagement with the internal teeth (41). As a result of the follow-up arrangement of the invention, the need for the conventional drive shaft and transverse pin is eliminated, the spool and sleeve can have smaller diameters, and the overall fluid controller can be smaller, less complicated, and less expensive. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an improved fluid controller of the type having a primary, spool valve and a follow up, sleeve valve, wherein the above-described disadvantages of the prior art fluid controller are overcome.
It is a more specific object of the present invention to provide a fluid controller of the type described in which the typical mechanism for transmitting follow-up movement to the sleeve valve is eliminated, and instead, there is a more simple and direct transmission of follow-up movement from the orbiting and rotating gerotor star to the sleeve valve.
The above and other objects of the invention are accomplished by the provision of a controller operable to control the flow of fluid from a source of pressurized fluid to a fluid pressure operated device.
The controller is of the type including housing means defining an inlet port for connection to the source, a return port for connection to a reservoir, and first and second control fluid ports for connection to the fluid pressure operated device.
Valve means is disposed in the housing means and comprises a primary, rotatable valve member and a cooperating, relatively rotatable follow up valve member, the primary and follow-up valve members defining a neutral position and a rotary operating position in which the primary and follow up valve members are relatively rotatably displaced.
The housing means and the valve means cooperate to define a main fluid path communicating between the inlet port and the first control fluid port, and between the second control fluid port and the return port, when the valve members are in the rotary operating position.
Fluid actuated means is included for imparting follow up movement to the valve means proportional to the volume of fluid flow therethrough, the fluid actuated means including a stationary internally toothed ring member, and an externally toothed star member having rotational movement relative to the ring member.
The controller is characterized by the follow up valve member including a terminal portion disposed immediately adjacent the externally toothed star member
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Metal Working 
