US 11,535,208 B2Granted

Hydraulic transaxle

AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.

InventorsJun Matsuura, Koji Iwaki, Toshifumi Yasuda

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Abstract

A hydraulic transaxle facilitates mounting a parking brake unit which requires no link mechanism and is compact. The parking brake unit includes a brake rotor provided on a rotation shaft and a locking member being displaceable between a first position where the brake rotor is locked and a second position where the brake rotor is unlocked. The locking member includes a locking portion which is engaged in a recess formed in the brake rotor that locks the brake rotor in the first position, and a non-locking portion which is placed at a position corresponding to the recess and which separates from the brake rotor in the second position. The hydraulic transaxle further includes an oil-supply mechanism capable of displacing the locking member to the second position.

Claims10

Dependent claims

A hydraulic transaxle comprising:

a housing which supports an axle and in which oil is stored;
a hydraulic continuously variable transmission for driving the axle disposed in the housing that uses the oil as hydraulic oil;
an oil-supply mechanism which draws the oil and which includes an external oil-supply circuit that transfers the oil from the housing to the exterior of the housing;
a hydraulic speed control mechanism for adjusting output of the hydraulic continuously variable transmission;
a parking brake mechanism configured to restrict rotation of the axle, comprising:
a brake rotor capable of rotating in association with the axle, and
a locking member being displaceable between a first position where the brake rotor is locked and cannot rotate and a second position where the brake rotor is unlocked and is free to rotate;
the hydraulic transaxle further comprising:
a hydraulic brake mechanism capable of displacing the locking member to the second position by hydraulic pressure of the oil, wherein the hydraulic speed control mechanism and the hydraulic brake mechanism are connected to the external oil-supply circuit in parallel;
and
an on-off valve configured to control supply of the oil from the external oil-supply circuit is provided at a location of the external oil-supply circuit closer to the oil-supply mechanism than a connecting point of the hydraulic speed control mechanism and the external oil-supply circuit, and a connecting point of the hydraulic brake mechanism and the external oil-supply circuit.

8 more elements

A hydraulic transaxle comprising:

a housing which supports an axle and in which oil is stored;
a hydraulic continuously variable transmission for driving the axle disposed in the housing that uses the oil as hydraulic oil;
a parking brake unit configured to restrict rotation of the axle, comprising:
a brake rotor which is provided on a rotation shaft constituting a transmitting mechanism and which can coaxially rotate with the rotation shaft;
a locking member being displaceable between a first position where the brake rotor is locked and cannot rotate and a second position where the brake rotor is unlocked and is free to rotate, and
the locking member comprising:
a locking portion that is engaged in a recess formed in the brake rotor and which locks the brake rotor in the first position;
and
a non-locking portion which is placed in a position corresponding to the recess and which separates from the brake rotor in the second position,
wherein the hydraulic transaxle comprises an oil-supply mechanism capable of displacing the locking member to the second position by hydraulic pressure.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/292,052Filed 4 Mar 2019
Priority: JP JP2018-390005 Mar 2018
Published: US 2019/0270435 A15 Sep 2019
Granted: 27 Dec 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B60T 1/005
Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles: by locking of wheel or transmission rotation
A01D 34/66
Mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle: with two or more cutters
B60K 17/105
Of fluid gearing: units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles
B60T 1/062
Acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels: acting on transmission parts