Hydropneumatic vehicular suspension unit

Claim 1

A SUSPENSION UNIT FOR CONNECTING A SPRUNG MASS TO AN UNSPRUNG MASS COMPRISING, IN COMBINATION: (A) A CYLINDER MEMBER ENCLOSING A CAVITY THEREIN; (B) FIRST WALL MEANS DEFINING A STORAGE SPACE; (C) A SECOND WALL MEANS DIVIDING SAID CAVITY INTO A PUMP SPACE AND A PRESSURE SPACE, (1) SAID SECOND WALL MEANS BEING FORMED WITH AN OPENING THERETHROUGH, SAID OPENING PASSING THROUGH SAID SECOND WALL MEANS IN A PREDETERMINED DIRECTION; (D) A DIFFERENTIAL PLUNGER MEMBER ARRANGED FOR MOVEMENT IN SAID DIRECTION INWARD AND OUTWARD OF SAID PUMP SAPCE BETWEEN TWO TERMINAL POSITIONS, (1) SAID PLUNGER MEMBER HAVING A FIRST PORTION OF SUBSTANTIALLY UNIFORM CROSS SECTION SEALINGLY ENGAGING SAID CYLINDER MEMBER DURING SAID MOVEMENT, AND (2) A SECOND PORTION OF SUBSTANTIALLY UNIFORM CROSS SECTION DIFFERENT IN AREA FROM THE CROSS SECTION OF SAID FIRST PORTION, (3) SAID SECOND PORTION BEING ADAPTED SEALINGLY TO ENGAGE SAID OPENING WHEN SAID PLUNGER MEMBER IS ADJACENT ONE OF SAID TERMINAL POSITIONS THEREOF, AND (4) SAID SECOND PORTION BEING SPACED FROM SAID SECOND WALL MEANS WHEN SAID PLUNGER MEMBER IS ADJACENT THE OTHER TERMINAL POSITION THEREOF; (E) FIRST PRESSURE RESPONSIVE VALVE MEANS SELECTIVELY CONNECTING SAID STORAGE SPACE TO SAID PUMP SPACE FOR ADMITTING LIQUID FROM SAID STORAGE SPACE TO SAID PUMP SPACE WHEN THE PRESSURE IN THE LATTER IS LOWER THAN IN THE FORMER; (F) SECOND PRESSURE RESPONSIVE VALVE MEANS SELECTIVELY CONNECTING SAID PUMP SPACE TO SAID PRESSURE SPACE FOR ADMITTING LIQUID FROM THE PUMP SPACE TO THE PRESSURE SPACE WHEN THE PRESSURE IN THE LATTER IS LOWER THAN IN THE FORMER; (G) THIRD VALVE MEANS RESPONSIVE TO MOVEMENT OF SAID PLUNHER MEMBER INTO A POSITION ADJACENT SAID OTHER TERMINAL POSITION FOR CONNECTING SAID STORAGE SPACE TO SAID PUMP SPACE; (H) FASTENING MEANS FOR RESPECTIVELY FASTENING SAID CYLINDER MEMBER AND SAID PLUNGER MEMBER TO A SPRUNG MASS AND TO AN UNSPRUNG MASS.