Claims
- 1. A hydraulic motor, comprising:
- a surrounding rotatable frame casing;
- a stationary internal cylinder block with radially arranged cylinders and a stationary axle of the hydraulic motor attached thereto;
- pistons reciprocating in the cylinders and bearing the inner surface of the frame casing, said inner surface being formed as a running surface guiding the movement of the pistons;
- feed and exhaust channels for the hydraulic fluid;
- a fluid distributor mounted around the axle to rotate together with the frame casing, for the distribution of the hydraulic fluid from said feed channel in the stationary axle into cylinder chambers and away therefrom to said exhaust channel in the stationary axle via openings provided in the cylinder block;
- at least two ring-shaped spaces provided between the rotatable fluid distributor and the stationary axle thereby forming a rotatable interface between the stationary axle and the fluid distributor, said spaces being formed in the feed and exhaust channels for the hydraulic fluid, said ring-shaped spaces being formed by stepwise formations in counter surfaces of the fluid distributor and the axle, a first ring-shaped space being formed between a first stepped surface of the fluid distributor and a first stepped counter surface of the axle, a second ring-shaped space being formed between a second stepped surface of the fluid distributor and a second stepped counter surface of the axle; and
- the area of the end counter surface facing the cylinder block in the ring-shaped spaces being so dimensioned that the force caused by the hydraulic fluid in the ring-shaped spaces presses the fluid distributor against the cylinder block compensating for the force separating the fluid distributor and the cylinder block.
- 2. Hydraulic motor according to claim 1, characterized in that the ring-shaped spaces in the axial direction are defined by the radial ring surfaces of the counter surfaces of the fluid distributor and the axle and in the radial direction by the axial peripheral surfaces of the counter surfaces of the fluid distributor and the axle.
- 3. Hydraulic motor according to claim 1, characterized in that the two ring-shaped spaces are provided between the fluid distributor and the axle, the first space thereof being formed in the feed channel before the openings of the cylinder block and the second space in the exhaust channel after the openings of the cylinder block, with respect to the flow direction of the fluid.
- 4. Hydraulic motor according to claim 3, characterized in that in the first ringshaped space the area of the end surface towards the cylinder block is of the same size as the area of the end surface towards the cylinder block in the second ring-shaped space.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 834477 |
Dec 1983 |
FIX |
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Parent Case Info
This application is a continuation of application Ser. No. 678,713, filed Dec. 6,1984, now abandoned.
The invention relates to a hydraulic motor which comprises a surrounding frame casing; an internal cylinder block with radially arranged cylinders and a stationary axle of the hydraulic motor attached thereto; pistons reciprocating in the cylinders and bearing the inner surface of the frame casing, which surface is formed as a running surface guiding the movement of the pistons; a fluid distributor mounted around the axle to rotate together with the frame casing, for the distribution of the hydraulic fluid into cylinder chambers and away therefrom via openings provided in the cylinder block; and feed and exhaust channels for the hydraulic fluid.
In this type of known hydraulic motors, efforts have been made to counterbalance the force separating the distribution surface between the fluid distributor and the cylinder block by means of various balancing elements. A common feature and disadvantage of said balancing elements is their complicated structure.
The object of the present invention is to improve a hydraulic motor of the above-mentioned type by eliminating the complicated balancing elements and the disadvantages and difficulties caused thereby and to provide a hydraulic motor with lower production costs and reliable operation simultaneously counterbalancing the force separating the distribution surface between the fluid distributor and the cylinder block.
These objects have been achieved by means of the invention in such a manner that at least one ringshaped space is provided between the fluid distributor and the axle, said space being formed at least in the feed channel for the hydraulic fluid, and that the ring space is formed by stepwise formations of the counter surfaces of the fluid distributor and the axle.
One advantage of the present invention is that no separate balancing elements are required for balancing the fluid distributor and pressing it against the cylinder block, but the force separating the fluid distributor and the cylinder block is compensated by the force caused by the hydraulic fluid on the cylinder block side wall of the ring space.
According to one preferred embodiment of the invention, two separate ring spaces are provided between the fluid distributor and the axle, one in the feed channel and the other in the return channel. Thereby, a hydraulic motor is provided, wherein the fluid distributor is balanced regardless of the direction of operation of the motor. The direction of operation of the motor is thereby changed simply in such a manner that the channel which was previously acting as a feed channel is turned into an exhaust (return) channel and the channel which was previously acting as an exhaust channel is turned into a feed channel.
US Referenced Citations (10)
Foreign Referenced Citations (4)
| Number |
Date |
Country |
| 2537552 |
Mar 1977 |
DEX |
| 1285698 |
Aug 1972 |
GBX |
| 1399596 |
Jul 1975 |
GBX |
| 2086991 |
May 1982 |
GBX |
Continuations (1)
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Number |
Date |
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| Parent |
678713 |
Dec 1984 |
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Patent Grant
4700613
