US 5,085,053 AGranted

Swashplate assembly for a swashplate type hydraulic pressure device

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsTsutomu Hayashi, Noritaka Koga, Kiyoshi Katahira, Atuo Hojo, Toshifumi Ito, Mitsuru Saito, Yoshihiro Nakajima, Shinkichi Miyazawa, Yoshihiro Yoshida

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Abstract

A power train for vehicles having a swashplate type continuously variable transmission having a swashplate hydraulic pump and a swashplate hydraulic motor, a transmission cylinder therebetween with a plurality of pump plunger holes and motor plunger holes formed therein. The transmission cylinder is rotatable about an axis and is coupled with the crankshaft of the engine. The pump swashplate is rotatable and disposed at an angle to the axis of the transmission cylinder and is coupled with pump plungers. A motor swashplate which is variably inclined relative to the axis of the cylinder and includes motor plungers associated with the cylinder. The swashplates have a number of spherical protruding portions which are abutted by spherical concave portions on the plungers with the concavities having a larger radius of curvature than the protruding portions with engagement varying from radially outwardly to radially inwardly of the axes of the plungers relative to the cylinder and radial forces are diametrically disposed to center the swashplate.

Claims30

Dependent claims

A power train for vehicles, the vehicles having engines, the power train comprising, a swashplate type continuously variable transmission having:

(a) a transmission cylinder having an axis and supported rotatable about the axis, a plurality of pump plunger holes and motor plunger holes formed therein parallel to the axis and annularly about the axis, the transmission cylinder being connected to a crankshaft of the engine to be rotated thereby;
(b) a plurality of pump plungers having plunger heads and disposed slidable in respect pump plunger holes so that the plunger heads protrude out of the transmission cylinder, each of the heads having a concavity formed therein;
(c) a pump swashplate having an axis and a plurality of projections formed on a surface thereof, the pump swashplate being disposed so that the axis thereof is inclined to the axis of the transmission cylinder and the pump swashplate is rotatable about the axis thereof, the projections of the pump swashplate being received by the respective concavity in the head of the pump plungers, whereby the pump plungers pump out a fluid by a reciprocal movement thereof according to rotational movement of the transmission cylinder;
(d) a plurality of motor plungers having plunger heads and disposed slidable in respective motor plunger holes so that the heads protrude out of the transmission cylinder, each of the heads having a concavity formed therein;
(e) motor swashplate having an axis and a plurality of projections formed on a surface thereof, the projections of the motor swashplate being received by the respective concavity in the head of the motor plungers, the motor swashplate being disposed so that the angle formed between the axis thereof and the axis of the transmission cylinder is changeable and the motor swashplate is rotatable about the axis thereof, whereby the ratio of the rotational speed of the transmission cylinder and the motor swashplate being variable in accordance with the angle of the swashplate to the axis of the transmission cylinder.

2 more elements

A swashplate type hydraulic pressure device comprising:

a cylinder having an axis;
a number of plungers axially slidably disposed in a number of cylinder bores which are arranged in said cylinder annularly around the axis thereof, each of the plungers having a spherical concave portion formed at a tip end thereof;
a swashplate holder disposed opposedly to the tip ends of said plunges;
and
a swashplate rotatably supported on said swashplate holder and having a number of spherical protruding portions formed on a surface thereof to be abutted by spherical concave portions of the plungers;
wherein said spherical concave portions of the plungers are each formed to have a radius of curvature larger than that of the associated spherical protruding portions of the swashplate and a center point of engagement between the spherical concave portions of the plungers and the associated spherical protruding portions of the swashplate is displaceable in an inclined state of the swashplate, in response to sliding motion of the plunger in said cylinder bore, between a radially outer side position at which said center point of engagement is located radially outer than an axis of the plunger with respect to the cylinder axis and a radially inner side position at which said center point is located radially inner than said axis of the plunger with respect to the cylinder axis;
and
wherein radial forces acting on said swashplate at respective center points of engagement between the spherical concave portions of the plungers and the spherical protruding portions of swashplate are directed such that the radial forces appearing in the spherical protruding portions located on a substantially same diametrical line on the swashplate work to offset each other regardless of the angle of inclination of the swashplate so as to center said swashplate.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/483,277Filed 20 Feb 1990 · continuation
Priority: JP 62-33244228 Dec 1987
Granted: 4 Feb 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F02B 61/02
Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing: for driving cycles
B62M 19/00
Transmissions characterised by use of non-mechanical gearing
F02B 75/16
Other engines: engines characterised by number of cylinders, e.g. single-cylinder engines
F04B 1/205
Valves: cylindrical