# US 2018/0320752 A1 · Bump stopper and shock absorber

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- Number: US 2018/0320752 A1
- Document ID: US20180320752A1
- Status: Published application
- Kind: A1
- Application number: 15/773,249
- Filed: 2016-09-16
- Published: 2018-11-08
- Earliest claimed: 2015-11-20
- Assignees: KYB Corporation
- Applicants: KYB Corporation
- Inventors: Hirohito KATO; Naoki YAMAMOTO
- Web page: https://patentgrep.com/patent/US20180320752A1

## CPC

- F16F 9/58: Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder (F16F9/49 takes precedence)
- F16F 9/32: Details
- F16F 9/3242: {of cylinder ends, e.g. caps}
- F16F 9/36: Special sealings, including sealings or guides for piston-rods ({F16F9/325, F16F9/3485 take precedence; arrangements for filling via piston rod sealing or guiding means F16F9/432} ; sealing of moving parts in general F16J15/16 - F16J15/56)
- F16F 9/362: {Combination of sealing and guide arrangements for piston rods (F16F9/361, F16F9/365 take precedence)}
- F16F 9/366: {functioning as guide only, e.g. bushings}
- B60G 5/00: Resilient suspensions for a set of tandem wheels or axles having interrelated movements
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})

## Abstract

A bump stopper includes a cap, a stopper configured to receive a bump cushion, and a collar, wherein the cap includes a plate-shaped part having a rod hole into which a piston rod is inserted, and a cylindrical part configured to receive a cylinder, the stopper is provided to the plate-shaped part, and the collar provided to the plate-shaped part opposing the cylinder.

## Claims

### Claim 1

A bump stopper for absorbing shocks generated during maximum contraction of a shock absorber in cooperation with a bump cushion, the bump stopper comprising:
a cap including a plate-shaped part having a rod hole into which a piston rod of the shock absorber is inserted, and a cylindrical part configured to receive a portion of a cylinder of the shock absorber;
a stopper provided to the plate-shaped part, the stopper being configured to receive the bump cushion; and
a collar provided to the plate-shaped part opposing the cylinder.

### Claim 2 (depends on 1)

The bump stopper according to claim 1, wherein the collar comprises a plurality of support parts arranged in a radial manner on the plate-shaped part, the plurality of support parts being configured to support the plate-shaped part,
a passage is formed by the cap and the collar, the passage being configured to allow the rod hole to communicate with an outside of the cylindrical part via an inside of the cylindrical part, and
the passage is formed between the adjacent support parts.

### Claim 3 (depends on 2)

The bump stopper according to claim 2, wherein the collar further comprises a connection part configured to connect the adjacent support parts.

### Claim 4 (depends on 3)

The bump stopper according to claim 3, wherein the rod hole has an opening, and
the connection part is positioned more toward an inside in a radial direction than an inner peripheral surface of the opening, the connection part being formed in a planar shape along the support parts.

### Claim 5 (depends on 3)

The bump stopper according to claim 3, wherein the rod hole has an opening, and
the connection part is positioned more toward an inside in a radial direction than an inner peripheral surface of the opening, the connection part being formed to be depressed relative to the support parts.

### Claim 6 (depends on 3)

The bump stopper according to claim 3, wherein the rod hole is circular, and
the connection part is positioned more toward an inside in an radial direction than a circular inner peripheral surface of the rod hole, the connection part being formed to be depressed relative to the support parts.

### Claim 7 (depends on 6)

The bump stopper according to claim 6, wherein the connection part is formed in an annular shape and is disposed within the rod hole of the plate-shaped part.

### Claim 8 (depends on 2)

The bump stopper according to claim 2, wherein the plurality of support parts are separated from each other.

### Claim 9 (depends on 1)

The bump stopper according to claim 1, wherein an inner peripheral surface of the stopper is positioned more toward the inside in the radial direction than the inner peripheral surface of the rod hole of the plate-shaped part.

### Claim 10 (depends on 2)

A shock absorber comprising:
the bump stopper according to claim 2; and
a piston rod that is inserted into the rod hole of the plate-shaped part,
wherein a flow passage cross-section of the passage is larger than a flow passage cross-section in a gap between the stopper and the piston rod.