Damper

Patent metadata

Field	Value
Publication number	US-9995361-B2
Application number	US-201515304881-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 19, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A damper includes a cylinder, an annular rod guide, an annular seat, a rod, an annular oil seal, a rebound cushion, and a communication passage. The cylinder houses an action chamber. The rod guide is secured to one side opening of the cylinder. The seat is secured to the rod guide. The rod is inserted through inner peripheral sides of the rod guide and the seat. The oil seal is held to an inner periphery of the rod guide and slidably in contact with an outer peripheral surface of the rod. The rebound cushion bumps against the seat. The communication passage transmits a pressure in the action chamber to the oil seal. An opening on the communication passage on the action chamber side is disposed on an outer peripheral side relative to a part of the seat against which the rebound cushion bumps.

First claim

The invention claimed is:

1. A damper comprising:
a cylinder that internally forms an action chamber;
an annular rod guide secured to one side opening of the cylinder;
an annular seat secured to the rod guide on the action chamber side;
a rod inserted through inner peripheral sides of the rod guide and the seat so as to be axially movable;
an annular oil seal held to an inner periphery of the rod guide, the oil seal being slidably in contact with an outer peripheral surface of the rod;
a rebound cushion installed to an outer periphery of the rod inserted into the cylinder, the rebound cushion bumping against the seat at a most extension; and
a communication passage configured to transmit a pressure in the action chamber to the oil seal, wherein
an opening on the communication passage on the action chamber side is disposed on an outer peripheral side relative to a part of the seat against which the rebound cushion bumps, and
an outer peripheral end of the rebound cushion is located on an inner peripheral side of an inner peripheral end of the opening,
wherein the communication passage is defined by a groove in an outer peripheral end of the annular seat and an inner surface of the cylinder.

2. The damper according to claim 1 , wherein:
a cutout is formed on the outer peripheral portion of the seat, and
the communication passage includes a vertical passage formed of the cutout.

3. The damper according to claim 2 , wherein:
an inclined surface is formed on an outer periphery of the rod guide, the inclined surface gradually decreasing in diameter toward the seat side end, the inclined surface being opposed to the cutout, a bottom groove being formed along a radial direction on the seat side of the rod guide, and
the communication passage includes an annular passage and a lateral passage, the annular passage being formed between the inclined surface and the cylinder, the lateral passage being formed between the bottom groove and the seat.

4. The damper according to claim 2 , wherein:
a lateral groove extending from the cutout to the seat center side along a radial direction is formed on the rod guide side of the seat, and
the communication passage includes a lateral passage formed between the lateral groove and the rod guide.

5. The damper according to claim 1 , wherein
the seat is in contact with the rod guide.

6. The damper of claim 1 , wherein the communication passage is formed in the annular seat to transmit the pressure in the action chamber through the annular seat to the annular oil seal.

7. A damper comprising:
a cylinder that internally forms an action chamber;
an annular rod guide secured to one side opening of the cylinder;
an annular seat secured to the rod guide on the action chamber side;
a rod inserted through inner peripheral sides of the rod guide and the seat so as to be axially movable;
an annular oil seal held to an inner periphery of the rod guide, the oil seal being slidably in contact with an outer peripheral surface of the rod;
a rebound cushion installed to an outer periphery of the rod inserted into the cylinder, the rebound cushion bumping against the seat at a most extension; and
a communication passage configured to transmit a pressure in the action chamber to the oil seal, wherein
an opening on the communication passage on the action chamber side is disposed on an outer peripheral side relative to a part of the seat against which the rebound cushion bumps,
a cutout is formed on the outer peripheral portion of the seat,
the communication passage includes a vertical passage formed of the cutout,
an inclined surface is formed on an outer periphery of the rod guide, the inclined surface gradually decreasing in diameter toward the seat side end, the inclined surface being opposed to the cutout, a bottom groove being formed along a radial direction on the seat side of the rod guide, and
the communication passage includes an annular passage and a lateral passage, the annular passage being formed between the inclined surface and the cylinder, the lateral passage being formed between the bottom groove and the seat.

8. The damper according to claim 7 , wherein the seat is in contact with the rod guide.

9. The damper of claim 7 , wherein the communication passage is formed in the annular seat to transmit the pressure in the action chamber through the annular seat to the annular oil seal.

10. A damper comprising:
a cylinder that internally forms an action chamber;
an annular rod guide secured to one side opening of the cylinder;
an annular seat secured to the rod guide on the action chamber side;
a rod inserted through inner peripheral sides of the rod guide and the seat so as to be axially movable;
an annular oil seal held to an inner periphery of the rod guide, the oil seal being slidably in contact with an outer peripheral surface of the rod;
a rebound cushion installed to an outer periphery of the rod inserted into the cylinder, the rebound cushion bumping against the seat at a most extension; and
a communication passage configured to transmit a pressure in the action chamber to the oil seal, wherein
an opening on the communication passage on the action chamber side is disposed on an outer peripheral side relative to a part of the seat against which the rebound cushion bumps,
a cutout is formed on the outer peripheral portion of the seat,
the communication passage includes a vertical passage formed of the cutout,
a lateral groove extending from the cutout to the seat center side along a radial direction is formed on the rod guide side of the seat, and
the communication passage includes a lateral passage formed between the lateral groove and the rod guide.

11. The damper according to claim 10 , wherein the seat is in contact with the rod guide.

12. The damper of claim 10 , wherein the communication passage is formed in the annular seat to transmit the pressure in the action chamber through the annular seat to the annular oil seal.

Assignees

• Kyb Corp

Inventors

• Takeuchi Hideaki

Classifications

• F16F9/362 Primary

  Combination of sealing and guide arrangements for piston rods (F16F9/361, F16F9/365 take precedence) · CPC title

• F16F9/3242

  of cylinder ends, e.g. caps · CPC title

• F16F9/585

  within the cylinder, in contact with working fluid · CPC title

• F16F9/061

  Mono-tubular units · CPC title

• F16F9/3235

  of cylinders (F16F9/483 takes precedence) · CPC title