# US 2017/0254382 A1 · Impact energy absorbing device

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- Number: US 2017/0254382 A1
- Document ID: US20170254382A1
- Status: Published application
- Kind: A1
- Application number: 15/506,869
- Filed: 2015-06-08
- Published: 2017-09-07
- Earliest claimed: 2014-08-27
- Assignees: Axtone Spolka Akcyjna
- Applicants: Axtone Spolka Akcyjna
- Inventors: Jan KUKULSKI; Leszek WASILEWSKI
- Web page: https://patentgrep.com/patent/US20170254382A1

## CPC

- F16F 9/483: {characterised by giving a particular shape to the cylinder, e.g. conical}
- F16F 9/19: with a single cylinder {and of single-tube type}
- F16F 9/3214: {of pistons (F16F9/0227 and F16F9/36 take precedence; throttling passages in or on piston body F16F9/3405)}
- F16F 9/3228: {of connections between pistons and piston rods}
- F16F 9/3235: {of cylinders (F16F9/483 takes precedence)}
- F16F 9/3242: {of cylinder ends, e.g. caps}
- F16F 9/3278: {for lubrication (lubricating per se F16N)}
- F16F 9/362: {Combination of sealing and guide arrangements for piston rods (F16F9/361, F16F9/365 take precedence)}
- F16F 9/363: {the guide being mounted between the piston and the sealing, enabling lubrication of the guide}
- F16F 2230/04: Lubrication
- F16F 2236/04: Compression
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

A device having two glands leading a piston rod the glands being located at one side of a piston, whereas an inner gland divides the chamber inside the closed cylinder into a working chamber limited axially by an inner surface of a bottom and into a lubricating chamber limited axially by the inner surface of the outer gland. The working chamber has a flow zone shaped as the cylinder with its inner diameter increased, placed adjacent to the inner gland, as well as the compression zone, whereas the inner diameter of the cylinder is slidingly fitted with the outer diameter of the piston.

## Claims

### Claim 1

A device absorbing energy of impacts created by railway vehicles, said device comprising a cylinder ended with a bottom inside which there is a piston being connected with a piston rod axially led through glands and protruding out of the front plane of the cylinder, wherein
it has two glands located on one side of the piston, whereas the inner gland divides a chamber created inside the closed cylinder into a working chamber limited axially by an inner surface of a bottom, as well as into a lubricating chamber limited axially by an inner surface of the outer gland, whereas
the working chamber has a flow zone having the cylinder with its inner diameter increased, placed adjacent to the inner gland, and a compression zone having an inner diameter of the cylinder slidingly fit with the outer diameter of the piston.

### Claim 2 (depends on 1)

The energy absorbing device according to claim 1, wherein at least one interim zone with a gradually changing inner diameter of the cylinder is created between the flow zone and the compression zone.

### Claim 3 (depends on 2)

The energy absorbing device according to claim 2, wherein said interim zone has a conically changing inner diameter of the cylinder.

### Claim 4 (depends on 1)

The energy absorbing device according to claim 1, wherein the piston has an arched front surface.

### Claim 5 (depends on 1)

The energy absorbing device according to claim 1, wherein the piston has a sliding ring.

### Claim 6 (depends on 1)

The energy absorbing device according to claim 1, wherein at least one overflow valve is located in the piston.

### Claim 7 (depends on 1)

The energy absorbing device according to claim 1, wherein at least one non-return valve is located in the piston.

### Claim 8 (depends on 1)

The energy absorbing device according to claim 1, wherein the outer gland has at least one through opening closed with a screwed-in plug.

### Claim 9 (depends on 1)

The energy absorbing device according to claim 1, wherein at least one through opening is made in the bottom of the cylinder, said opening being closed with a screwed-in plug.

### Claim 10 (depends on 1)

The energy absorbing device according to claim 1, wherein a valve located in the bottom of the cylinder is used to force the working fluid under pressure into the working chamber.

### Claim 11 (depends on 1)

The energy absorbing device according to claim 1, wherein the outer gland has a sliding bush leading the piston rod.

### Claim 12 (depends on 1)

The energy absorbing device according to claim 1, wherein the inner gland has a cylindrical sealing packet.