Tamping unit for tamping sleepers of a track

Patent metadata

Field	Value
Publication number	US-11549220-B2
Application number	US-201816498019-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	May 3, 2017
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A tamping unit for tamping sleepers of a track includes a lowerable tool carrier and oppositely positioned tamping tools. Each tamping tool is connected via a pivot arm to a squeezing drive for producing a squeezing motion and to an electric vibration drive for producing a vibratory motion. The electric vibration drive includes an eccentric shaft which, together with a rotor of an electric motor, is mounted merely in an eccenter housing. A stator of the electric motor with a motor housing is flange-mounted to the eccenter housing. As a result of the omission of a separate motor mounting, the motor housing has a particularly small overall depth.

First claim

The invention claimed is:

1. A tamping unit for tamping sleepers of a track, the tamping unit comprising:
a lowerable tool carrier;
oppositely-positioned tamping tools;
a squeezing drive for producing a squeezing motion;
an electric vibration drive for producing a vibratory motion, said electric vibration drive having an eccentric shaft and an electric motor with a rotor, a stator and a motor housing;
pivot arms each connecting a respective one of said tamping tools to said squeezing drive and to said electric vibration drive;
an eccenter housing;
said eccentric shaft and said rotor being mounted only in said eccenter housing;
said eccentric shaft having an end facing said motor housing, and a form-locking connection disposed between said end and said rotor; and
said stator and said motor housing being flange-mounted to said eccenter housing.

2. The tamping unit according to claim 1 , wherein said electric motor is an internal-rotor torque motor.

3. The tamping unit according to claim 1 , which further comprises a bushing connected to said rotor, said bushing having internal teeth, said eccentric shaft having external teeth, and said form-locking connection being formed by said external and internal teeth.

4. The tamping unit according to claim 1 , wherein said form-locking connection is a screw connection.

5. A tamping unit for tamping sleepers of a track, the tamping unit comprising:
a lowerable tool carrier;
oppositely-positioned tamping tools;
a squeezing drive for producing a squeezing motion;
an electric vibration drive for producing a vibratory motion, said electric vibration drive having an eccentric shaft and a water-cooled electric motor with a rotor, a stator and a motor housing;
pivot arms each connecting a respective one of said tamping tools to said squeezing drive and to said electric vibration drive;
an eccenter housing;
said eccentric shaft and said rotor being mounted only in said eccenter housing; and
said stator and said motor housing being flange-mounted to said eccenter housing.

6. A tamping unit for tamping sleepers of a track, the tamping unit comprising:
a lowerable tool carrier;
oppositely-positioned tamping tools;
a squeezing drive for producing a squeezing motion;
an electric vibration drive for producing a vibratory motion, said electric vibration drive having an eccentric shaft and an electric motor with a rotor, a stator and a motor housing;
pivot arms each connecting a respective one of said tamping tools to said squeezing drive and to said electric vibration drive;
an eccenter housing;
said eccentric shaft and said rotor being mounted only in said eccenter housing;
said stator and said motor housing being flange-mounted to said eccenter housing; and
a sealing ring sealing said motor housing relative to said eccenter housing at a feed-through of said eccentric shaft.

7. The tamping unit according to claim 1 , which further comprises a centering positioning said motor housing relative to said eccenter housing.

8. The tamping unit according to claim 1 , wherein said eccentric shaft has a plurality of different eccentric sections, and said different eccentric sections are associated with respective oppositely-positioned tamping tools.

9. The tamping unit according to claim 1 , wherein said eccentric shaft has an eccentric section, and a transmission element for transmitting the vibratory motion is mounted on said eccentric section.

Assignees

• Plasser & Theurer Export Von Bahnbaumaschinen Gmbh
• Piasser & Theurer Export Von Bahnbaumaschinen Ges M B H

Inventors

• Matzinger Nikolaus
• Stadler Lothar

Classifications

• E01B27/16 Primary

  Sleeper-tamping machines · CPC title

• B06B1/16 Primary

  operating with systems involving rotary unbalanced masses · CPC title

• E01B2203/12

  Tamping devices · CPC title

• E01B2203/127

  vibrating the track surface · CPC title