Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Radially disposed cylinders
Patent
1996-05-23
1998-11-17
Thorpe, Timothy
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Radially disposed cylinders
91519, F01B 106
Patent
active
058362312
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a radial-piston hydraulic motor and a method for regulation of a radial-piston hydraulic motor.
BACKGROUND OF THE INVENTION
In the prior art, a number of axial-piston motor constructions are known, which operate at a high speed of rotation, and with these motors, a high torque is achieved exclusively by connecting the motor with a reduction gear at one or several stages. In the present patent application, a radial-piston motor construction will be described by whose means a high torque is achieved at low speeds of rotation. The construction also permits changing of the volume per revolution of the motor in one or several different stages. In this way, an exceptionally wide speed range is obtained by feeding a relatively little volumetric flow through the motor. A motor is provided which has a stepwise adjustable volume.
OBJECTS AND SUMMARY OF THE INVENTION
According to the invention, the radial hydraulic motor has been formed so that at least one of its piston mechanisms can be switched out of operation so as to change the volume per revolution of the motor and, thus, to regulate the speed of rotation and the torque. According to the invention, the equipment has been formed so that a separate valve, preferably a spindle valve, is used in a stationary stator part connected with a stationary shaft, which stator part contains the piston spaces of the piston mechanism. Thus, the valve is fitted in the stator part between the piston and the distributor valve that revolves as a rotor. By means of the valve, the pressurized medium is connected to the piston and, in a corresponding way, said fluid connection is closed in a situation in which said piston is switched out of operation.
The radial-piston hydraulic motor in accordance with the invention is mainly characterized in that the volume per revolution of the motor can be changed in one or several stages so that one or several piston mechanisms can be coupled into the interior of the cylinder group so that the press wheels of the piston mechanisms come out of contact with the cam ring, and that there is a closing valve by whose means the flow of the working pressure is connected to the piston mechanism connected with the closing valve, or the fluid flow to said mechanism is closed.
The method in accordance with the invention for regulation of a radial-piston hydraulic motor is mainly characterized in that, in the method, the fluid flow into at least one piston mechanism is closed and opened so that the closing valve is fitted in the cylinder frame of the piston mechanism, the flow of fluid into the piston mechanism connected with the closing valve being closed and opened by controlling the closing valve.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, the invention being, however, not supposed to be confined to said embodiments alone.
FIG. 1A is a schematic illustration of the operation of a radial-piston hydraulic motor.
FIG. 1B is a side view of the equipment shown in FIG. 1A, and, based on this illustration, the operation of the revolving distributor, i.e. of the distributor valve, will be explained in more detail.
FIG. 2 shows the hydraulic diagram of a first preferred embodiment of the radial-piston hydraulic motor in accordance with the invention.
FIG. 3 is a sectional view of a hydraulic motor related to the embodiment shown in FIG. 2.
FIGS. 4A, 4B are enlarged views of the closing valve, which is fitted in the stationary cylinder frame between the piston and the distributor valve, i.e. distributor, revolving as a rotor. In FIG. 4A the closing valve is in the position in which the working pressure is passed through the closing valve into the piston space of the piston mechanism. FIG. 4B shows the closing valve in the position in which the control pressure has been passed to the closing valve and the access of the working pressure into the piston s
REFERENCES:
patent: 3090361 (1963-05-01), Orshansky, Jr.
patent: 3527144 (1970-09-01), Firth et al.
patent: 4171732 (1979-10-01), Pinson
patent: 4326450 (1982-04-01), Bacquie
patent: 4398450 (1983-08-01), Louhio
patent: 4724742 (1988-02-01), Bigo et al.
patent: 4807519 (1989-02-01), Wusthof et al.
Thorpe Timothy
Tyler Cheryl J.
Valmet Voimansiirto Oy
LandOfFree
Radial-piston hydraulic motor and method for regulation of a rad does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radial-piston hydraulic motor and method for regulation of a rad, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial-piston hydraulic motor and method for regulation of a rad will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-874830