piston
The piston design with a granular-filled space counteracts oscillation through inertial forces, reducing weight and vibration, addressing piston pitching issues in diesel engines.
JP7875448B2Active Publication Date: 2026-06-18MAZDA MOTOR CORP
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MAZDA MOTOR CORP
- Filing Date
- 2022-12-12
- Publication Date
- 2026-06-18
AI Technical Summary
⚠Technical Problem
Piston pitching and oscillation in reciprocating engines, particularly in diesel engines, lead to increased mechanical resistance, vibration, and noise, which existing damping structures fail to effectively suppress.
⚗Method used
A piston design with a space inside the piston body filled with granular material, shaped to expand from one end to the other in the width direction, utilizing the inertial force of the granular material to counteract piston oscillation.
🎯Benefits of technology
The design reduces piston weight and effectively suppresses oscillation, thereby reducing vibration and noise while maintaining efficient engine operation.
✦ Generated by Eureka AI based on patent content.
Smart Images
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Figure 3
Abstract
To provide a piston capable of reducing weight and decreasing vibrations and noise due to a swinging behavior.SOLUTION: A piston 5 is equipped with a piston body 50 that has a pin boss part 5d and is formed with a space part 5h inside the piston body 50, and powder and grains 17 that are movably filled in the space part 5h. The space part 5h, when viewed from an axial direction of the pin boss part 5d, is formed in a shape crossing an upper part of the pin boss part 5d in a width direction of the piston body 50 and gradually expanding from one end portion to the other end portion of the space part 5h.SELECTED DRAWING: Figure 3
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