Motor drive with disengageable coupling

Patent metadata

Field	Value
Publication number	US-10242811-B2
Application number	US-201515318601-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Jul 29, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A motor drive for actuation of an on- or off-load tap changer the drive has a drive motor, a load transmission having a first drive shaft carrying a first drive wheel and connected with the drive motor and a second drive shaft carrying a second drive wheel, and a mechanical coupling between the first and second drive wheels. The second drive shaft is operatively connected at a first end with the on- or off-load tap changer and at a second end with an indicator transmission. A setting indicator operatively connected with the indicator transmission displays the current setting of the on- or off-load tap changer, and a disengageable coupling is provided between the setting indicator and the load transmission.

First claim

The invention claimed is:

1. A motor drive for actuation of an on- or off-load tap changer the drive comprising:
a drive motor;
a load transmission having a first drive shaft carrying a first drive wheel and connected with the drive motor and a second drive shaft carrying a second drive wheel;
a mechanical coupling between the first and second drive wheels;
an indicator transmission;
means operatively connecting the second drive shaft at a first end thereof with the on- or off-load tap changer, a second end of the second drive shaft being connected with the indicator transmission;
a setting indicator operatively connected with the indicator transmission to display the current setting of the on- or off-load tap changer; and
a disengageable coupling between the setting indicator and the load transmission.

2. The motor drive according to claim 1 , wherein the disengageable coupling is switchable in such a way that in a decoupled state the setting indicator is kinematically separated from rotation of the drive motor and in a coupled state the setting indicator is kinematically coupled with the drive motor for rotation thereby.

3. The motor drive according to claim 1 , wherein the disengageable coupling comprises:
a first coupling gear rotationally fixed on a drive input shaft;
a second coupling gear rotationally fixed on a third drive shaft parallel to the first coupling gear, and
an axially displaceable coupling pin extending parallel to the drive input shaft and carrying a third coupling gear rotationally fixed on the coupling pin and meshable with the first and second coupling gears.

4. The motor drive according to claim 3 , further comprising:
a compression spring on the coupling pin and braced between a mounting bracket and the third coupling gear.

5. The motor drive according to claim 4 , wherein the coupling pin is axially displaceable between a coupled position in which the third coupling gear meshes with the first and second coupling gears and a decoupled position in which in the third coupling gear meshes only with the first coupling gear.

6. The motor drive according to claim 3 , wherein the coupling pin has an externally accessible opening.

7. The motor drive according to claim 3 , wherein the third drive shaft is a cone shaft.

8. The motor drive according to claim 1 , wherein the disengageable coupling comprises:
a drive input shaft carrying a compression spring braced between an abutment and a cone bushing,
an output drive shaft with a frustoconical end facing the cone bushing, the cone bushing being axially displaceable between the drive input shaft and the output drive shaft, and
an axially displaceable coupling pin engaged in the cone bushing by a connecting fork.

9. The motor drive according to claim 8 , wherein the cone bushing is a clamping hub.

10. The motor drive according to claim 8 , wherein the coupling pin is axially displaceable between a coupled position in which the cone bushing is connected by friction with the frustoconical end of the output drive shaft and a decoupled position in which the cone bushing is displaced by the connecting fork toward the abutment so that the connection by friction releases.

11. The motor drive according to claim 8 , wherein the cone bushing is formed with a recess in which a pin mounted on the drive input shaft so engages that on rotation of the drive input shaft the pin transmits torque to the cone bushing through the pin with its outer surface on an inner side of the recess.

Assignees

• Reinhausen Maschf Scheubeck

Inventors

• Jobst Johann
• Goss Michael
• Pircher Christian

Classifications

• H02K7/116

  with gears · CPC title

• H01H9/0033 Primary

  with means for indicating the selected tap or limiting the number of selectable taps · CPC title

• H01H2003/323

  the mechanisms being adjustable · CPC title

• H01H19/12

  Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing · CPC title

• H01H3/32

  Driving mechanisms, i.e. for transmitting driving force to the contacts (snap-action arrangements H01H5/00; introducing a predetermined time delay H01H7/00) · CPC title