Power plants – Pressure fluid source and motor – Pulsator
Patent
1996-05-14
1997-06-17
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Pulsator
60571, 60584, F15B 710
Patent
active
056386800
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for double-acting hydraulic systems.
From WO92/08914 it is known that double-acting hydraulic systems can be filled with hydraulic fluid, hereinafter called oil, by first filling one circuit and then the second circuit. In a known type of master cylinder, a channel in the cylinder wall at each piston end section connects the respective cylinder spaces with an oil reservoir via a boring in each piston end section. One end of this boring leads into the piston surface between two packings which are located at each piston end section, and in the boring there is provided a one-way valve which prevents flow from the cylinder space to the reservoir. Thus oil can flow almost unimpeded from the reservoir to each master cylinder space, but not in the opposite direction. If the latter is to be possible, the piston first has to be moved in one direction until the outermost packing at the piston end where the volume of the cylinder space increases has passed the channel outlet. The circuit of the double-acting master cylinder/slave cylinder system which comprises this cylinder space can now be filled with oil, the circuit first being evacuated and then connected with an oil reservoir from where the oil is sucked and fills this circuit.
Thereafter the master cylinder's piston can be moved the other way until the outermost packing at the second piston end section uncovers the second boring in the cylinder, whereupon the second circuit is first evacuated and then filled with oil in a similar manner.
In this method the same steps have to be repeated, which is cumbersome and time-consuming. Moreover the oil which has been sucked into the supply line to the evacuation coupling will be able to create difficulties during the evacuation of the second circuit.
Alternatively the system can be filled by means of oil under pressure. In this method the vent valves on the slave cylinder are first opened and oil supplied to the circuits via associated channels in the master cylinder. Oil flows hereby through the associated communicating borings in the piston and one-way valves in these, and into the associated slave cylinder space, the air in the circuits escaping through the vent valves. When oil flows out of the vent valve, this is closed.
This method too is cumbersome and time-consuming, and has the additional problem of oil spillage. This method is also unreliable in systems where there are a great many bends in the pipes and the pipe diameter is large.
Within the car industry, e.g., simpler and better methods are being sought whereby double-acting hydraulic systems can be filled.
The object of the invention is therefore to provide a device of the type mentioned in the introduction which is not encumbered by the above-mentioned disadvantages.
The invention will now be described in more detail with reference to the drawing which illustrates schematically an embodiment of a device according to the invention.
FIG. 1 is a perspective view of a double-acting slave cylinder and channels therein, where sections of the slave cylinder housing have been cut away.
FIGS. 2-5 show simplified longitudinal sections through a double-acting hydraulic system, where some of the components are illustrated in various relative positions in the various views.
As illustrated in FIG. 1 there extends centrally through a slave cylinder housing 1 a cylinder boring 2, which is closed at each end by respective cylinder end walls 3, 4. In the cylinder boring 2 there is slidably provided a piston 5 whose opposite ends are connected with respective piston rods 6, 7, which sealingly extend through borings in the cylinder end walls 3, 4.
According to FIG. 2 pipe lines 70, 71 whereby oil from the associated master cylinder's 72 two cylinder spaces 73, 74 can be supplied to the slave cylinder housing 1, are connected to respective supply borings 10, 11 in the housing 1, end sections of the lines being capable of comprising plugs with external threads and the supply borings can have an external section with corresponding internal thre
REFERENCES:
patent: 2520731 (1950-08-01), MacDuff
patent: 4030560 (1977-06-01), Parquet et al.
patent: 4033132 (1977-07-01), Priest et al.
patent: 4959960 (1990-10-01), LaFountain
patent: 4979366 (1990-12-01), Compton et al.
Kongsberg Automotive A/S
Lopez F. Daniel
LandOfFree
Device for double-acting hydraulic systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for double-acting hydraulic systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for double-acting hydraulic systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2151082