Road structure – process – or apparatus – Apparatus – Automatic control
Reexamination Certificate
1999-08-31
2001-06-05
Will, Thomas B. (Department: 3673)
Road structure, process, or apparatus
Apparatus
Automatic control
C404S117000, C091S529000, C060S374000, C060S394000, C060S422000, C060S424000, C060S484000, C060S494000
Reexamination Certificate
active
06241420
ABSTRACT:
CONTROL SYSTEM FOR A VIBRATORY COMPACTOR
1. Technical Field
This invention relates to a vibratory compacting machine and, more particularly, to a control system for actuation of the vibratory mechanisms.
2. Background Art
Vibratory compactors typically comprise rotatable drums that are oscillated or vibrated to impose compaction forces on a compactable surface, such as ground soil, roadway base, or paving material. Generally the compacting machine includes an engine that is mounted on a main frame to which the rotatable drums are resiliently mounted.
Vibratory mechanisms or eccentric masses mounted inside the drums are used to create these compaction forces. A fluid pump connected to the engine is used to power hydraulic motors to rotate the eccentric masses. During initial start up a large amount of energy is required from the engine to rotate the eccentric masses from a static state. This initial draw on the engine creates a noticeable drawdown on the engine. If the machine is being propelled on an incline, starting or excitation of the eccentric masses can cause the engine to stall. This requires either the engine to be oversized to meet the full application needs of the machine or a system that controls the initial start-up of the eccentric masses.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a fluid control system is provided for a work machine. The work machine has first and second compacting drums rotatably mounted on a main frame. The main frame supports an engine that has a pump connected thereto. The first and second compacting drums respectively include first and second vibratory mechanisms. The fluid control system comprises a first and a second hydraulic motor. The first hydraulic motor is connected to the pump and operatively connected to the first vibratory mechanism. The second hydraulic motor is connected in series with the first hydraulic motor and operatively connected with the second vibratory mechanism. A fluid control valve is disposed between and connected to the pump and the first hydraulic motor. A bypass valve is connected to the first and second hydraulic motors. A sequencing device is responsive to actuation of the fluid control valve and is connected to the bypass valve and controls actuation of said second hydraulic motor.
In another aspect of the present invention a method is provided for controlling the excitation of a first vibratory mechanism and a second vibratory mechanism. The method comprises the steps of actuating the first vibratory mechanism of the work machine and actuating the second vibratory mechanism of the compacting machine dependant on a predetermined amount of time or a predetermined event.
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Debrock Gerard
Perrin Jacques
Caterpillar Paving Products Inc.
Greene Jeff A.
Hartmann Gary S.
Will Thomas B.
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