US12571449USUSPTO Grant XML

Damper device

The present invention addresses the problem of stabilizing the state of assembly of a seal member while allowing movement of a piston member in a direction that reduces one space inside a cylinder member with little resistance. The seal member includes a base portion located towards the one space, which is a first space inside the cylinder member, and an extending portion extending from the base portion toward the other space, which is the second space inside the cylinder member. The piston member is provided with a first holding portion that faces the base portion of the sealing member, a second holding portion that faces an extended edge of the extended portion of the sealing member, and a third holding portion that faces a held part formed on the inside of the extended portion of the seal member. A fluid passage is formed in the second holding portion.

Patent

Brief

Patent brief

Problem

How can vibration in electric motors and rotors be reduced?

Novelty

The seal member includes a base portion located towards the one space, which is a first space inside the cylinder member...

Uses

Motor mounts, Equipment isolation, Compact machinery

Assignee

NIFCO INC.

Published

Mar 10, 2026

Inventors

Katsutoshi Uchida

Domain

Electromechanical systems

Plain-English summary

Problem

How can vibration in electric motors and rotors be reduced?

Solution

addresses the problem of stabilizing the state of assembly of a seal member while allowing movement of a piston member in a direction that reduces one space inside a cylinder member with little resistance.

Key novelty

The seal member includes a base portion located towards the one space, which is a first space inside the cylinder member, and an extending portion extending from the base portion toward the other space, which is the second space inside the cylinder member.

Applications

Motor mountsEquipment isolationCompact machinery

Relevant search intents

damper

Claims preview

1 . A damper device comprising: a piston member, a cylinder member housing the piston member, and a seal member sealing between the piston member and the cylinder member, and forming a braking force by a movement or a relative movement of the piston member, wherein the piston member divides a first space and a second space in the cylinder member, the seal member has an annular shape surrounding the piston member, and includes a base portion located in a first space side of the cylinder member, and an extending portion extending from the base portion to a second space side of the cylinder member, the piston member includes a first holding portion facing the base portion of the seal member, a second holding portion facing an extending end of the extending portion of the seal member, a third holding portion facing a held portion formed at an inner side of the extending portion of the seal member, and a plurality of projections spaced apart from each other projecting, between the first holding portion and the second holding portion, from the piston member in a direction orthogonal to a moving central axis of the piston member, wherein the second holding portion is formed with one or more than two passing portions of the fluid, and the third holding portion includes a surface of the projection facing the first holding portion. 2 . A damper device according to claim 1 , wherein a dent forming a flow path of the fluid relative to the seal member is formed to continue to the passing portion at a portion between the first holding portion and the second holding portion in the piston member. 3 . A damper device according to claim 1 , wherein the first space of the cylinder member becomes a high pressure at a time that the piston member moves in a direction to reduce the first space.

Linked approaches

Damping mounts

Isolation and damping structures that absorb motor vibration.

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