Piston and compressor using same
JP2026036578APending Publication Date: 2026-03-05HITACHI IND EQUIP SYST CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2026-03-05
AI Technical Summary
Technical Problem
Resin material pistons in compressors deteriorate due to high temperatures, leading to thermal decomposition, thermal oxidation, thermal deformation, and degassing, which reduces their strength and efficiency.
Method used
A piston design incorporating an insert material with a resin covering, where the side and top surfaces are covered with a resin material, and the piston's cross-sectional shape is formed by combining two different shapes to bring the high-temperature surfaces closer to the insert material for cooling.
Benefits of technology
Reduces the temperature of the high-temperature piston surfaces, thereby suppressing resin deterioration and maintaining the piston's strength and efficiency.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026036578000001_ABST
Abstract
To provide a compressor capable of reducing blow-by leaking from gaps between piston rings. [Solution] The piston 14 contains an insert material 14a, and at least the side surface 14b and the top surface 14c are covered with a resin material. The piston 14 is capable of swinging along one direction OD within a cylinder 15. The piston 14 also includes a piston ring 16 attached to the side surface 14b of the piston 14. The cross section of the piston 14 is located above the piston ring 16. The cross section perpendicular to the axial direction of the piston 14 is formed by combining two different shapes, a first shape 14ba and a second shape 14bb, which are defined by distances D1 and D2 from a central axis AX3 of the piston 14. When comparing the maximum values of the dimensions w1 and w2 of the first shape 14ba and the second shape 14bb in the orthogonal direction perpendicular to the one direction OD, the first shape 14ba is smaller.
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Citation Information
Patent Citations
Compressor
JP2021055646A