# US 10,309,478 B2 · End cap for a piston-cylinder unit

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- Number: US 10,309,478 B2
- Document ID: US10309478B2
- Status: Granted
- Kind: B2
- Application number: 15/528,601
- Filed: 2015-11-03
- Published: 2017-09-14
- Granted: 2019-06-04
- Earliest claimed: 2014-12-02
- Assignees: ZF Friedrichshafen AG
- Applicants: Zf Friedrichshafen AG
- Inventors: Younsik Choi; Yunhyung Kim
- Web page: https://patentgrep.com/patent/US10309478B2

## CPC

- 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 9/32: Details
- F16F 9/3242: {of cylinder ends, e.g. caps}
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

An end cap for a piston-cylinder unit with a base which has a through-opening and carries a seal, wherein at least one discharge channel extends radially proceeding from the seal, and wherein the discharge channel is constructed at the end cap on the inner side with respect to an outer cover surface.

## Claims

### Claim 1

An end cap for a for a piston-cylinder unit comprising:
a fastening portion;
a base having a through-opening and an inner side opposite an outer cover surface;
a seal carried by the base of the end cap;
at least one discharge channel extending radially proceeding from the seal, the at least one discharge channel constructed at the end cap on the inner side with respect to the outer cover surface and with respect to the fastening portion.

### Claim 2 (depends on 1)

The end cap according to claim 1, wherein the seal comprises a socket and the at least one discharge channel comprises a channel base constructed so as to be lower in a discharge direction than the socket of the seal.

### Claim 3 (depends on 2)

The end cap according to claim 2, additionally comprising a fastening ring separate from the seal and wherein the seal is held at the end cap by the fastening ring.

### Claim 4 (depends on 1)

The end cap according to claim 1, wherein the at least one discharge channel is constructed as an open groove at the inner side of the end cap.

### Claim 5 (depends on 4)

The end cap according to claim 4, additionally comprising an axial groove in the fastening portion of the end cap, and wherein the open groove adjoins the axial groove.

### Claim 6 (depends on 5)

The end cap according to claim 5, additionally comprising a fastening ring separate from the seal and wherein the seal is held at the end cap by the fastening ring.

### Claim 7 (depends on 4)

The end cap according to claim 4, additionally comprising a fastening ring separate from the seal and wherein the seal is held at the end cap by the fastening ring.

### Claim 8 (depends on 1)

The end cap according to claim 1, wherein the base comprises a wall and wherein the at least one discharge channel is constructed as a tube inside the wall.

### Claim 9 (depends on 8)

The end cap according to claim 8, additionally comprising a fastening ring separate from the seal and wherein the seal is held at the end cap by the fastening ring.

### Claim 10 (depends on 1)

The end cap according to claim 1, additionally comprising a fastening ring separate from the seal and wherein the seal is held at the end cap by the fastening ring.