Hydraulic damper

Patent metadata

Field	Value
Publication number	US-12018732-B2
Application number	US-202117394992-A
Country	US
Kind code	B2
Filing date	Aug 5, 2021
Priority date	Mar 8, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A hydraulic damper includes: a rod that is inserted into a cylinder containing liquid; a piston that is connected to the rod and partition the cylinder into a first liquid chamber and a second liquid chamber; a channel forming part having a channel between the first liquid chamber and the second liquid chamber; a valve part configured to open and close the channel and generate damping force; and a damping force changer including an inflow part into which the liquid flows and configured to change the damping force by using liquid pressure in the inflow part. The damping force changer includes: a pressure changing part that changes the liquid pressure in the inflow part by being deformed or displaced; a support part that supports the pressure changing part; and an inflow forming part that holds the support part and forms the inflow part jointly with the support part.

First claim

The invention claimed is:

1. A hydraulic damper comprising:
a rod configured to be inserted into a cylinder containing liquid, the rod being provided so as to be movable relative to the cylinder in an axial direction;
a piston configured to be connected to the rod and partition a space inside the cylinder into a first liquid chamber and a second liquid chamber each containing the liquid;
a channel forming part configured to form a channel for the liquid between the first liquid chamber and the second liquid chamber;
a valve part configured to open and close the channel in the channel forming part and generate damping force; and
a damping force changer including an inflow part into which the liquid flows, the damping force changer being configured to change the damping force generated in the valve part by using pressure of the liquid in the inflow part, wherein
the damping force changer includes:
a pressure changing part configured to change pressure of the liquid in the inflow part by being deformed or displaced;
a support part configured to support the pressure changing part;
an inflow forming part configured to hold the support part by a crimped portion that is crimped and to form the inflow part jointly with the support part;
a filter part including a filter, the filter being provided in a channel through which the liquid flows into the inflow part and being configured to collect foreign matters contained in the liquid, the filter part being held at the inflow forming part by the crimped portion along with the support part; and
a pressing part interposed between the crimped portion of the inflow forming part and the support part and configured to press the filter part.

2. The hydraulic damper according to claim 1 , wherein the pressing part is an elastic planar member.

3. The hydraulic damper according to claim 1 , wherein the filter part protrudes farther toward the pressing part than the support part.

4. The hydraulic damper according to claim 1 , further comprising an end structure disposed at an end of the cylinder opposite to an end thereof provided with the rod, wherein
the pressing part is provided between the end structure and the filter part and includes a facing portion facing the end structure.

5. The hydraulic damper according to claim 1 , wherein
the support part includes a first tapered portion at a position different from the crimped portion, and
the inflow forming part includes a second tapered portion facing the first tapered portion of the support part.

6. The hydraulic damper according to claim 2 , wherein the filter part protrudes farther toward the pressing part than the support part.

7. The hydraulic damper according to claim 2 , further comprising an end structure disposed at an end of the cylinder opposite to an end thereof provided with the rod, wherein
the pressing part is provided between the end structure and the filter part and includes a facing portion facing the end structure.

8. The hydraulic damper according to claim 3 , further comprising an end structure disposed at an end of the cylinder opposite to an end thereof provided with the rod, wherein
the pressing part is provided between the end structure and the filter part and includes a facing portion facing the end structure.

9. The hydraulic damper according to claim 6 , further comprising an end structure disposed at an end of the cylinder opposite to an end thereof provided with the rod, wherein
the pressing part is provided between the end structure and the filter part and includes a facing portion facing the end structure.

Assignees

• Hitachi Astemo Ltd

Inventors

• KAWATE Isamu
• KOTERA Kenta

Classifications

• F16F9/3485 Primary

  characterised by features of supporting elements intended to guide or limit the movement of the annular discs (F16F9/3488 takes precedence) · CPC title

• F16F9/3285

  for filtering (filters per se B01D) · CPC title

• F16F9/185 Primary

  Bitubular units (where compression of gas leads to a clear spring action F16F9/062) · CPC title