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US 5,495,712 AGranted
Variable displacement type hydraulic system
AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.
InventorsKazuhiko Yano, Shigenori Sakikawa, Ryota Ohashi
Life of this patent
Estimating the term…
Abstract
A variable displacement type hydraulic system is contained in a housing. A guide is provided on an axis of slanting movement of a swash plate. The guide is fitted into an inner ring of a roller bearing. The roller bearing is fitted into a groove formed at an inner wall of the housing and a groove formed at a cylinder block mounting surface of a center section so as to be fixedly positioned in the housing. In accordance with the invention, sliding resistance of the swash plate is reduced to improve the ability of the swash plate to return to the neutral position.
Claims11
A hydraulic system, comprising:
- a housing;
- a variable displacement hydraulic unit contained in said housing, said hydraulic unit being provided with a rotatable cylinder block having a plurality of pistons movable in reciprocation and a swash plate having an abutting surface for abutting against heads of said pistons and an axis of slanting movement;
- operating means for controllably slantingly moving said abutting surface of said swash plate with respect to a rotary axis of said cylinder block;
- and
- a roller bearing fixedly positioned in said housing having an inner ring with an inner circumference, said swash plate including a guide on a side surface thereof having a circumference smaller than said inner circumference of said inner ring of said roller bearing such that a size and weight of said swash plate is reduced, said guide being fitted within said inner ring for slantingly movably supporting said swash plate in a slantingly movable position within said housing, wherein a center of radius of curvature of said guide coincides with the axis of slanting movement of said swash plate.
2 more elements
A hydraulic system, comprising:
- a housing;
- a variable displacement hydraulic unit contained in said housing, said hydraulic unit having a rotatable cylinder block having a plurality of pistons movable in reciprocation and a swash plate having an abutting surface abutting against heads of said pistons and an axis of slanting movement;
- operating means for controllably slantingly moving the abutting surface of said swash plate with respect to a rotary axis of said cylinder block, said swash plate including a guide on a surface of said swash plate, a center portion of a radius of curvature of said guide coinciding with the axis of slanting movement of said swash plate;
- a roller bearing having an inner ring, said guide being fitted in said inner ring of said roller bearing;
- and
- fixing means for mounting said roller bearing in said housing, said fixing means comprising two members separably mounted, said roller bearing being fixedly sandwiched between said two members, wherein one of said two members is a center section for rotatably and slidably mounting said cylinder block, and wherein said roller bearing supports said swash plate in a slantingly movably position.
3 more elements
A hydraulic system, comprising:
- a housing;
- a variable displacement hydraulic unit contained in said housing, said hydraulic unit having a rotatable cylinder block having a plurality of pistons each movable in reciprocation;
- a swash plate having an abutting surface abutting against heads of said pistons;
- a control shaft for controllably slantingly moving the abutting surface of said swash plate with respect to a rotary axis of said cylinder block, said control shaft being rotatably supported to said housing and extending substantially parallel to said rotary axis of said cylinder block, a portion of said control shaft being in an interior of said housing;
- an arm disposed on said portion of said control shaft for receiving an input force, said arm having a projection;
- a pair of roller bearings fixed within said housing each having an inner ring;
- and
- a pair of guides each including an arcuate portion being disposed on a side surface of said swash plate, one of said pair of guides having a groove, wherein said arcuate portion of each of said pair of guides are fitted in each of said inner rings such that said roller bearings support said swash plate in a slantingly movably position, and
- wherein said projection projects within one of said inner rings of said roller bearings so as to engage with said groove of one of said pair of guides for slantingly moving said swash plate.
6 more elements
Dependencies are inferred from the claim text.