Swashplate type hydraulic rotary machine
The swash plate type hydraulic rotary machine addresses displacement issues by allowing the valve plate to displace within defined ranges, reducing mechanical losses and improving durability without bearings.
JP2026085959APending Publication Date: 2026-05-26HITACHI CONSTRUCTION MACHINERY CO LTD
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- HITACHI CONSTRUCTION MACHINERY CO LTD
- Filing Date
- 2024-11-14
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing hydraulic rotary machines face issues with incomplete suppression of displacement between the valve plate and cylinder block, leading to mechanical losses and increased part count due to the use of bearings for alignment.
Method used
A swash plate type hydraulic rotary machine design where the valve plate is supported by the casing and allowed to displace within specific ranges to follow the cylinder block, eliminating the need for bearings and enhancing alignment through spherical sliding surfaces.
Benefits of technology
This design reduces mechanical losses and improves durability by ensuring proper alignment between the valve plate and cylinder block, while minimizing the number of parts.
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Smart Images
Figure 2026085959000001_ABST
Abstract
To provide a swashplate type hydraulic rotary machine that can reduce mechanical losses and improve durability. [Solution] The hydraulic pump 1, which is a swashplate type hydraulic rotary machine, comprises a casing 2, a cylinder block 5, a plurality of pistons 7, a valve plate 8, and a swashplate 10. The valve plate 8 is supported by the casing 2 so as to be displaceable from a reference position S, where the center of the second spherical sliding contact surface 8C of the valve plate 8 coincides with the center of the first spherical sliding contact surface 5C of the cylinder block 5, to the following first, second, and third movable ranges: 1) The first movable range, corresponding to the first direction 21 from the top dead center to the bottom dead center of the piston 7. 2) The second movable range, corresponding to the second direction 22 from the discharge port 8B to the suction port 8A. 3) The third movable range, corresponding to the third direction 23, which is the direction of the smaller of the two angular ranges α and β formed by the first imaginary line 41 extending in the first direction 21 and the second imaginary line 42 extending in the second direction 22.
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