Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Radially disposed cylinders
Patent
1986-11-13
1988-01-05
Freeh, William L.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Radially disposed cylinders
92130R, F01B 1306, F01B 3100
Patent
active
047168161
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulic motor, in which a rotating motion is generated by a combined effect of a cam ring and roller means connected to the pistons of a cylinder group and in which in connection with each piston in the cylinder group is arranged a spiral spring leaning against the cylinder group to disengage the piston with its roller means from the cam ring when the pressure ducts of the motor are connected to a space without pressure. The motor can be rotated freely by means of an outer force, if the roller means of the pistons, e.g. the piston rollers, are disengaged from the cam ring.
It is known to carry out this dummy coupling by connecting the pressure ducts of the motor with a space without pressure and by leading an overpressure into the motor casing, which overpressure disengages the pistons with their roller means and keeps them in disengagement from the cam ring. For this purpose, however, a pressure source is needed.
It is also known to arrange a dummy coupling by means of draw springs, which springs connect with each other the axle stubs joining together the pistons and piston rollers of a radial piston motor and which springs thus create force components pulling the pistons with the rollers towards the centre of the motor. The axle stubs required for the solution constitute a disadvantage.
The object is to provide a new and less complicated solution to a dummy coupling of a hydraulic motor.
A hydraulic motor of the invention is mainly characterized in that one end of the spiral spring mounted to lean against a support is arranged to influence the piston through a passage formed in the wall of the cylinder and the other end is arranged to lean against the support, while the spring thus acts as torsion spring.
A spiral spring acting as torsion spring is preferably used, which spring is mounted on a support fastened to the cylinder group, whereby one end of the spring is arranged to influence the piston through a passage formed in the cylinder wall and the other end of the spring is arranged to lean against the support. The support can generally resemble the letter T, whereby it is at its shaft fastened between two cylinders and round the branches a continuous spiral spring can be mounted, in the middle of which there is a substantially U-shaped supporting portion located against the shaft of the support.
In the dummy coupling of the invention there is thus no need of a pressure source or axle stubs mentioned above. The construction is simple and solid .
In the following, the invention is described in more detail with reference to the enclosed schematic drawing.
FIG. 1 is a longitudinal section of a radial piston motor.
FIG. 2 is a corresponding section of a cylinder group with dummy coupling springs.
FIG. 3 is a section of one cylinder.
FIG. 4 illustrates two adjacent cylinders from above.
In the embodiment example according to the drawing the hydraulic motor includes a rotating jacket, i.e. a casing 1 with cam rings 2. Pistons 5 moving to and fro in the cylinders 4 of a non-rotating cylinder group 3 make the casing 1 to rotate by means of rollers 6. The construction suggested for the dummy coupling of the motor is not presented in FIG. 1, but as it is apparent from FIG. 2, it can be located in the space defined by the casing 1, the cylinder group 3 and a plane divider 7. In the following, the FIGS. 2, 3 and 4 are referred to.
Plane divider 7 is a valving member that includes a plurality of fluid ports 20. Cylinders 4 have a corresponding number of passages 22 for transitting fluid between the cylinders 4 and the valving ports 20. The valving ports 20 are alternately connected to a high pressure chamber 24 or an exhaust chamber 26 as the casing 1 rotates.
In each particular case between two cylinders 4 is fastened a generally T-shaped support 8, 9, 10, the branches 9 and 10 of which are curved or form with each other an angle and thus at least substantially follow the periphery of the cylinder group 3. The branches 9 and 10 are not fastened to the divider 7, as could perhaps be th
REFERENCES:
patent: 2481754 (1949-09-01), Johnson
patent: 4225291 (1980-09-01), Bouwkamp
Freeh William L.
Oy Partek Ab
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