Automotive Products France, Sa

Schaeffler Technologies Ag & Co .kg

Patrick Desbois

Yannick Thenault

Loic Jean Bernard Bouyer

Yannick Frank Theophile Emile Christiaens

Yannick Frank Théophile Emile Christiaens

A housing ( ) for a master cylinder ( ) having a bore ( ) in which a piston ( ) is slideable to pressurize fluid ahead of a main seal ( ) on the piston for the supply of pressurized fluid to an outlet ( ). Two inlet openings ( ) are provided into the bore, a first opening ( ) for recuperation of fluid from an associated reservoir to that part ( ) of the bore ahead of the main piston seal ( ) when the piston is in a retracted position and a second opening ( ) placing that portion ( ) of the bore between the main piston seal and a second piston seal ( ) behind the main seal in permanent communication with the reservoir. The housing also has an external inlet connection ( ) formed integrally with the housing. The inlet connection has a free end for direct connection with a conduit ( ) connected with the associated reservoir and having a passage ( ) for connection with the conduit which opens into the housing bore at the first ( ) and second ( ) openings. The configuration of the passage and the first and second openings is such that the passage ( ) and the first and second openings ( ) can be formed by a single moulding core ( ).

Hydraulic cylinders

A hydraulic cylinder has a piston ( ) with a seal ( ) in sealed sliding contact within a bore ( ) to define a working chamber ( ) ahead of the piston for the discharge of pressurised fluid from the bore via an outlet ( ) when the piston is undertaking working stroke, an inlet ( ) is provided into the bore from an associated reservoir to allow connection between the reservoir and the working chamber when the piston is in a fully retracted state for recuperation of fluid from the reservoir to the working chamber. The connection between the reservoir and working chamber is provided via a sleeve ( ) in the bore ( ) winch includes axially extending grooves ( ), the grooves being closed by the piston seal ( ) during a working stroke of the cylinder but the ends ( ) of the grooves being open when the piston ( ) is in a fully retracted condition within the sleeve thus by-passing the piston sleeve to connect the working chamber and reservoir. The sleeve ( ) may also have a secondary function of providing an abutment ( ) for a return spring ( ) which returns the piston to its fully retracted position when an operating pedal ( ) associated with the piston ( ) is released.

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Olivet, France

Patrick Desbois