HYDRAULIC DRIVE DEVICE

• US 20190309769A1
• Filed: 03/27/2019
• Published: 10/10/2019
• Est. Priority Date: 04/04/2018
• Status: Active Grant

• Current Assignee: Nabtesco Corporation
• Original Assignee: Nabtesco Corporation
• Inventors: OKADA, Isamu, YOSHIDA, Makoto
• Granted Patent: US 11,168,709 B2
• Time in Patent Office: Days
• CPC Class Codes: F15B 11/04 for controlling the speed F15B11/024 takes precedence
• CPC Class Codes: F15B 2211/6336 representing a state of the output member, e.g. position, speed or acceleration
• CPC Class Codes: F15B 2211/75 Control of speed of the output member
• CPC Class Codes: F15B 7/008 with rotary output
• CPC Class Codes: F15B 7/08 Input units; Master units
• CPC Class Codes: G01P 3/44 for measuring angular speed G01P3/56 takes precedence
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

Provided is a hydraulic drive device configured not to be increased in length in an axial direction. The hydraulic drive device is provided with a body portion for converting energy of a supplied pressure oil into rotational power, the body portion including an output shaft configured to rotate along a rotational axis by the rotational power, a hydraulic block disposed in an extending direction of the output shaft of the body portion and having an oil passage for supplying the pressure oil to the body portion, and a rotation sensor for detecting rotation of the output shaft, at least part of the rotation sensor being disposed in the hydraulic block.

Claims

1. A hydraulic drive device, comprising:

a body portion for converting energy of a supplied pressure oil into rotational power, the body portion including an output shaft configured to rotate along a rotation axis by the rotational power;

a hydraulic block disposed in an extending direction of the output shaft of the body portion and having an oil passage for supplying the pressure oil to the body portion; and

a rotation sensor for detecting rotation of the output shaft, at least part of the rotation sensor being disposed in the hydraulic block.

2. The hydraulic drive device according to claim 1, wherein

with respect to the extending direction of the output shaft, the body portion is disposed on one side of the hydraulic block, while the rotation sensor is disposed on an other side of the hydraulic block,

an end portion of the hydraulic block on the other side has a concave portion, and

at least part of the rotation sensor is disposed in the concave portion.

3. The hydraulic drive device according to claim 1, wherein

the rotation sensor includes:

a rotary portion; and

a detection portion for measuring a rotational speed of the rotary portion,

the rotary portion is connected to the output shaft and axially rotates together with the output shaft, and

the rotation sensor determines a rotational speed of the output shaft with the detection portion measuring the rotational speed of the rotary portion.

4. The hydraulic drive device according to claim 3, wherein a connection part of the rotary portion at which the rotary portion is connected to the output shaft is disposed in the concave portion of the hydraulic block.

5. The hydraulic drive device according to claim 3, further comprising:

an interposition member secured to the hydraulic block, at least part of the interposition member being disposed in the concave portion of the hydraulic block,

wherein the detection portion is secured to the hydraulic block via the interposition member.

6. The hydraulic drive device according to claim 3, wherein

the output shaft includes a first connection shaft and a second connection shaft connected to each other,

the second connection shaft is disposed more distantly than the first connection shaft from the body portion, and

the rotary portion is connected to the second connection shaft.

7. The hydraulic drive device according to claim 1, wherein one end portion of the output shaft is disposed in the concave portion of the hydraulic block.