US 6,981,558 B2 | ||
Controller for an unbalanced mass adjusting unit of a soil compacting device | ||
Franz Riedl, München (Germany) | ||
Assigned to Wacker Construction Equipment AG, Munich (Germany) | ||
Appl. No. 10/473,475 PCT Filed Apr. 17, 2002, PCT No. PCT/EP02/04260 § 371(c)(1), (2), (4) Date Sep. 26, 2003, PCT Pub. No. WO02/087789, PCT Pub. Date Nov. 07, 2002. |
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Claims priority of application No. 101 21 383 (DE), filed on May 02, 2001. | ||
Prior Publication US 2004/0101367 A1, May 27, 2004 | ||
Int. Cl. E02D 7/18 (2006.01) |
U.S. Cl. 173—49 | 23 Claims |
1. A controller for an unbalanced mass-adjusting unit in a vibration exciter, comprising:
an adjusting piston which can be actuated hydraulically for the purpose of changing the relative position of unbalanced masses
in the vibration exciter;
a reference piston whose first side is hydraulically coupled to one side of the adjusting piston;
a signal-generating device for the purpose of generating an electrical position signal in dependence upon a position of the
reference piston;
a control device which can be influenced by the electrical position signal and by an operating signal which is provided by
an operator, wherein the control device generates a control signal in dependence upon the electrical position signal and the
operating signal; and
a pilot valve which is coupled to the reference piston for the purpose of controlling a supply of oil from a pressure oil
source or controlling a discharge of oil to an oil return line on a second side of the reference piston, wherein the position
of the pilot valve can be changed in dependence upon the control signal of the control device.
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