Hydraulic Drive Rotation Sensor Layout for Shorter Axial Length
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Solution Overview
Problem
Existing hydraulic drive devices with rotation sensors protrude significantly in the axial direction, increasing the overall length and complicating device configuration due to the placement of detection gears and electromagnetic pickup mechanisms on the hydraulic block's side surfaces.
Innovation Solution
The rotation sensor is partially or fully housed within a concave portion of the hydraulic block, with a rotary portion connected to the output shaft and a detection portion secured via an interposition member, allowing for reduced axial length by optimizing the placement of sensor components within the block's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation sensor is mounted on the side surface of the hydraulic block with protruding detection gear and electromagnetic pickup mechanism, then the rotational speed detection function is achieved, but the axial length of the device is increased
Solution Approach 1:
The rotation sensor is nested within the hydraulic block structure by forming a concave portion that houses the detection gear and electromagnetic pickup mechanism. The detection gear is formed on the inner peripheral surface of the concave portion, and the electromagnetic pickup mechanism is positioned within the same concave space, allowing both components to be integrated within the axial boundaries of the hydraulic block without protruding outward.
2Measurement precision
If the rotation sensor components are mounted on the side surface of the hydraulic block, then the rotational speed detection function is achieved, but the device configuration becomes complicated
Solution Approach 1:
The hydraulic block is designed to integrate multiple functions: it serves as the structural housing for the hydraulic motor, forms the detection gear through its inner peripheral surface, provides mounting positions for the electromagnetic pickup mechanism, and contains the concave portion that houses all rotation sensor components. This merging of functions into a single integrated block eliminates the need for separate mounting structures and reduces overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration minimizes the axial length of the hydraulic drive device while maintaining effective rotational speed detection, enabling more compact and efficient designs for hydraulic drive systems.
Implementation Method 1
a body portion (13) for converting energy of a supplied pressure oil into rotational power
Implementation Method 2
an electromagnetic pickup mechanism mounted to the hydraulic block... The electromagnetic pickup mechanism detects rotation of the detection gear
Data Source
AI summary
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.