Variable displacement hydraulic system

A variable displacement hydraulic system comprising:

• a housing;
• an arcuate slidable contact surface provided at an inner surface of said housing;
• a cylinder block having a rotary axis provided with a plurality of pistons movable in reciprocation and contained in said housing;
• a swash plate having a central opening and provided at both sides thereof with outwardly curved portions, said outwardly curved portions of said swash plate moving along said slidable contact surface to thereby control the reciprocation of each of said pistons;
• a rotary shaft connected to said cylinder block and perforating through said opening of said swash plate to extend along said rotary axis;
• an arcuate plate overlaps said outwardly curved portions of said swash plate and is formed of a material having a smooth surface and a high sliding efficiency;
• and
• means for shifting said arcuate plate in response to a slantwise rotation of said swash plate.

A variable displacement hydraulic system comprising:

• a housing;
• an arcuate slidable contact surface provided at an inner surface of said housing;
• a cylinder block having a rotary axis provided with a plurality of pistons movable in reciprocation and contained in said housing;
• a swash plate having a central opening and provided at both sides thereof with outwardly curved portions, said outwardly curved portions of said swash plate moving along said slidable contact surface to thereby control the reciprocation of said pistons;
• a rotary shaft connected to said cylinder block and extending through said opening of said swash plate to extend along said rotary axis;
• an arcuate plate which overlaps said outwardly curved portions of said swash plate formed of a material having a smooth surface and high sliding efficiency;
• and
• bent portions provided at said arcuate plate which fit said outwardly curved portions of said swash plate for maintaining said arcuate plate together with said swash plate when said swash plate is rotated slantwise.

A variable displacement hydraulic system comprising:

• a housing;
• an arcuate slidable contact surface provided at an inner surface of said housing;
• a cylinder block having a rotary axis provided with a plurality of pistons movable in reciprocation and contained in said housing;
• a swash plate having a central opening and provided at both sides thereof with outwardly curved portions, said outwardly curved portions of said swash plate moving along said slidable contact surface to thereby control the reciprocation of said pistons;
• a rotary shaft connected to said cylinder block and extending through said opening of said swash plate to extend along said rotary axis;
• and
• an arcuate plate which overlaps said outwardly curved portions of said swash plate formed of a material having a smooth surface and high sliding efficiency, said arcuate plate being cast on the surface of said outwardly curved portions of said swash plate when said swash plate is molded.