Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1993-06-22
1995-04-25
Basinger, Sherman
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
60385, 114150, B63H 2542
Patent
active
054094100
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hydraulic steering arrangement comprising a first hydraulic pump connected to a steering wheel, a piston cylinder device hydraulically coupled to the first hydraulic pump and arranged for connection to a steering mechanism, a second hydraulic pump and a second piston cylinder device hydraulically coupled via a servo valve to the second hydraulic pump, said second piston cylinder device being arranged to be connected to the steering mechanism, said servo valve having an actuating element which is affected by the first piston cylinder device to activate the second piston cylinder device and which comprises a tubular element limitedly displaceable relative to the servo valve housing.
BACKGROUND OF THE INVENTION
In a known steering arrangement of this type especially designed for boats, the piston rod of the first hydraulic cylinder is displaceably mounted in the tubular actuating element of the servo valve, while its cylinder has one end fixed to one end of the actuating element. The distal end of the piston rod together with the piston rod of the other piston cylinder device is connected to a steering arm on a rudder shaft or a steerable outboard drive unit. In such a steering device, the maximum piston rod extension is determined by the length of stroke of the piston in the first cylinder and in order to adapt the maximum extension of the piston rod to the required maximum deflection of the steering arm, a stop sleeve at the distal end of the cylinder is used or alternatively axially spaced mounting holes in the distal end of the piston rod. By means of the stop sleeve or the choice of mounting holes, the length of travel can be varied in steps and in this manner be adapted to the steering arm pivot movement required for the installation in question.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a steering arrangement of the type described by way of introduction in which the maximum steering arm swing can be simply varied with the steering arrangement mounted in place to thus make it possible for the customer to make the required adjustment. Said arrangement can also be made more compact and less bulky athwartships.
This is achieved according to the invention by virtue of the fact that a guide means is axially displaceably mounted in the tubular element and is joined to the piston cylinder devices and that the guide means is provided, at a portion extending out of the tubular element, with a stop which can be fixed at different axial positions on the extending portion to limit the maximum extent of stroke of the piston cylinder devices in one direction.
The stop can be formed of a nut on a threaded portion of the guide rod, which makes possible, in a simple manner, continuous adjustment of the maximum extension of the piston rod. The arrangement makes possible placement of piston cylinder devices side by side, which reduces the total length of the steering arrangement and thus the space requirement athwartships.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail with reference to an example shown in the accompanying drawings, where
FIG. 1 shows a partially sectioned sideview of a preferred embodiment of a steering arrangement according to the invention, and
FIG. 2 is a view from above of the device in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, 1 designates a boat steering wheel, which is mounted on a shaft 2 which constitutes the driving shaft of a reversible hydraulic pump 3. The pump 3 is connected via hydraulic lines 4 to the cylinder chambers of a double-acting hydraulic piston cylinder device 5, the piston rod 6 of which is fixed to a connecting piece 7, which is coupled via a pivot pin 8 to a steering arm 9 on a rudder shaft 10 or the steering shaft of an outboard drive unit. As the steering wheel is turned in one direction or the other, oil is pumped to one or the other cylinder chamber at the same time as the opposite cylinder chamber is drained, and this extends or retracts the p
REFERENCES:
patent: 4632049 (1986-12-01), Hall et al.
patent: 4892494 (1990-01-01), Ferguson
patent: 5213527 (1993-05-01), Fetchko
"Installation Instructions Hydraulic Steering for Servo cylinders Kit No. 1140585-9" by Volvo Penta.
AB Volvo Penta
Basinger Sherman
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