Hydraulic motor unit
AssigneeNabtesco Corporation
InventorHiromi Nagayama
Life of this patent
Estimating the term…
Abstract
An oil pressure motor unit according to an aspect of the disclosure includes: an oil pressure motor having an output shaft and a brake; a two-speed switching valve for switching a speed of the output shaft; and a brake release actuator for releasing braking of the brake. The oil pressure motor is connected to a first channel and a second channel each conveying a hydraulic fluid for driving. One of the hydraulic fluids conveyed by the first channel and the second channel conveyed under a lower pressure is supplied separately to the brake release actuator and the two-speed switching valve.
Claims6
A hydraulic motor unit, comprising:
- a hydraulic motor having an output shaft and a brake for braking the output shaft;
- a two-speed switching valve for switching a speed of the output shaft;
- and
- a brake actuator for releasing braking of the brake,
- wherein the hydraulic motor is connected to a first channel and a second channel each conveying a hydraulic fluid for driving, and
- wherein one of the hydraulic fluids conveyed by the first channel and the second channel conveyed under a lower pressure, which is a low-pressure hydraulic fluid, is supplied separately to the brake actuator and the two-speed switching valve.
A hydraulic motor unit, comprising:
- a hydraulic motor having an output shaft and a brake for braking the output shaft;
- a two-speed switching valve for switching a speed of the output shaft;
- and
- a brake actuator for releasing braking of the brake,
- wherein the hydraulic motor is connected to a first channel and a second channel each conveying a hydraulic fluid for driving by a hydraulic pump, and the hydraulic motor is connected in a closed circuit with the hydraulic pump to form an HST circuit, and
- wherein the hydraulic motor unit further comprises:
- a low-pressure selector valve connected to the first channel and the second channel and configured to select a low-pressure hydraulic fluid under a lower pressure from the hydraulic fluids conveyed by the first channel and the second channel;
- and
- one proportional valve connected to a third channel downstream of the low-pressure selector valve and housed inside the HST circuit, and
- wherein the hydraulic fluid under a lower pressure is branched and supplied to the brake actuator and the two-speed switching valve through a pilot channel connected to the proportional valve.
Dependencies are inferred from the claim text.