Swash plate type hydraulic system
First Claim
1. A swash plate type hydraulic system comprising a cylinder block having a number of cylinder bores annularly arranged therein, a group of plungers each slidably received in each of said cylinder bores, a swash plate engaging those ends of said plungers which protrude from said cylinder bores, and higher and lower pressure oil passages concentrically defined in said cylinder block in a manner distanced from each other, wherein the transfer of a working oil between said cylinder bores and said higher and lower pressure oil passages is conducted during relative rotation between said cylinder block and a member supporting said swash plate, and wherein a plurality of distributor valves are provided in said cylinder block in a radially arranged configuration for reciprocation between radially outer and inner positions to permit said respective cylinder bores to alternately communicate with said higher and lower pressure oil passages;
- an eccentric wheel is provided to abut against the outer ends of said distributor valves in such a manner to permit each of said distributor valves to reciprocate interlockingly with the relative rotation between the cylinder block and the swash plate supporting member when said eccentric wheel assumes a position eccentric with respect to a center of rotation of said cylinder block; and
a shifting device is provided for shifting an eccentric relationship of said eccentric wheel with respect to the center of rotation of said cylinder block.
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Accused Products
Abstract
In a swash plate type hydraulic system such as a hydraulic pump, a hydraulic motor of the like, a group of cylinder bores in which plungers engaging a swash plate are slidably received are annularly arranged in a cylinder block, and higher and lower pressure oil passages are concentrically provided in the cylinder block. Further, a group of distributor valves are provided in the cylinder block in a radially arranged configuration for controlling the connection and disconnection between the higher and lower pressure oil passages and the group of cylinder bores by radial reciprocating motion of the valves, and an eccentric wheel is provided eccentrically with respect to the center of rotation of the cylinder block to abut against the outer ends of the distributor valves so as to impart a reciprocating motion to each of the distributor valves. A shifting device is provided for changing the eccentric relationship between the eccentric wheel and the cylinder block.
65 Citations
45 Claims
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1. A swash plate type hydraulic system comprising a cylinder block having a number of cylinder bores annularly arranged therein, a group of plungers each slidably received in each of said cylinder bores, a swash plate engaging those ends of said plungers which protrude from said cylinder bores, and higher and lower pressure oil passages concentrically defined in said cylinder block in a manner distanced from each other, wherein the transfer of a working oil between said cylinder bores and said higher and lower pressure oil passages is conducted during relative rotation between said cylinder block and a member supporting said swash plate, and wherein a plurality of distributor valves are provided in said cylinder block in a radially arranged configuration for reciprocation between radially outer and inner positions to permit said respective cylinder bores to alternately communicate with said higher and lower pressure oil passages;
- an eccentric wheel is provided to abut against the outer ends of said distributor valves in such a manner to permit each of said distributor valves to reciprocate interlockingly with the relative rotation between the cylinder block and the swash plate supporting member when said eccentric wheel assumes a position eccentric with respect to a center of rotation of said cylinder block; and
a shifting device is provided for shifting an eccentric relationship of said eccentric wheel with respect to the center of rotation of said cylinder block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
- an eccentric wheel is provided to abut against the outer ends of said distributor valves in such a manner to permit each of said distributor valves to reciprocate interlockingly with the relative rotation between the cylinder block and the swash plate supporting member when said eccentric wheel assumes a position eccentric with respect to a center of rotation of said cylinder block; and
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34. A swash plate type hydraulic system comprising a cylinder block having a number of cylinder bores annularly arranged therein, a group of plungers each slidably received in one of said cylinder bores, a swash plate engaging those ends of said plungers which protrude from said cylinder bores, and higher and lower pressure oil passages defined in said cylinder block in a manner distanced from each other, wherein the transfer of a working oil between said cylinder bores and said higher and lower pressure oil passages is carried out during relative rotation between said cylinder block and a member supporting said swash plate, and wherein a plurality of distributor valves are provided in said cylinder block in a radially arranged configuration for reciprocation between radially outer and inner positions to permit said respective cylinder bores to alternately communicate with said higher and lower pressure oil passages;
- a distributor valve driving means is provided to cause said distributor valves to reciprocate interlockingly with the relative rotation between the cylinder block and the swash plate supporting member; and
a shifting device is provided for shifting a relationship of said distributor valve driving means with respect to the distributor valves so as to change a mode of reciprocating movement of the valves. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
- a distributor valve driving means is provided to cause said distributor valves to reciprocate interlockingly with the relative rotation between the cylinder block and the swash plate supporting member; and
Specification