Internal-combustion engines – Valve – Rotary
Patent
1998-03-26
1999-12-07
Moulis, Thomas N.
Internal-combustion engines
Valve
Rotary
12319014, 12319016, 12319017, F01L 708
Patent
active
059965444
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotary valve control for internal combustion engines and reciprocating pumps, having a cylinder head, in which a dynamically balanced cup-shaped rotary valve which is coupled with a drive, is arranged to be rotatable around the cylinder shaft, and at least one inlet conduit and at least one outlet conduit are provided in the cylinder head, and a control opening, which corresponds with the inlet conduit, or respectively the outlet conduit, is provided in the rotary valve, wherein a freely rotatable seal ring is provided in the area of the inlet conduit and the outlet conduit at least on the side of the rotary valve facing the cylinder, the rotary valve is centrally driven and the cylinder head and the cylinder are provided with cooling conduits on both sides of the rotary valve.
Such a rotary valve control is known (DE-A-43 12 492).
Another rotary valve control is known (DE-PS-911 791). In this known rotary valve control the rotary valve is provided with teeth on the edge, which are in engagement with a pinion gear arranged at the end of a shaft. Furthermore, the cylinder head, and therefore the rotary valve, are cooled by cooling ribs arranged on the exterior of the cylinder head.
This known rotary valve control has the disadvantage that the rotary valve does not have sufficient sealing, required for a long service life, in respect to the openings in the cylinder head. Furthermore, cooling of the rotary valve does not appear to be sufficient.
The technical problem on which the invention is based therefore consists in improving the known rotary valve control mentioned at the outset in respect to its dependability, load-carrying ability, service life and economy.
This technical problem is solved by the invention in that
a. the rotary valve is coupled with the drive by means of the interposition of a spring device acting in the circumferential direction,
b. the rotatable seal rings are coupled with a drive,
c. the seal rings, which are arranged on the side of the rotary valve facing away from the cylinder, are embodied as an axial bearing,
d. the seal rings are provided with lubrication and cooling.
The rotatable seal rings have a multiple function in the solution in accordance with the invention. Because now they are continuously driven mechanically, or preferably hydraulically, independent of the rotation of the rotary valve, they are simultaneously lubricated and cooled.
The seal rings on the exterior, i.e. the side of the rotary valve facing away from the cylinder, not only seal the rotary valve in respect to the inlet and outlet conduits, but also act as axial bearings for damping the pressure forces generated by the piston and acting on the rotary valve.
The seal rings acting as axial bearings also prevent the possible vibration of the rotary valve during load changes in the course of the operation of the device. This simultaneously permits a reduction of the wall thickness of the rotary valve, so that less heat is stored in it and the centrifugal forces caused by their mass are reduced.
The spring device inserted into the drive of the rotary valve, which acts in the direction of rotation and can act mechanically or hydraulically, permits a fluctuation of the circular velocity of the rotary valve. Such a fluctuation is caused, for example, by the changing pressure conditions in the cylinder. The rotary movement of the rotary valve is evened out by the resilient drive of the rotary valve, and shock-like loads of the drive system are prevented.
If required, the spring unit can also be designed with springs, whose spring characteristics can be controlled in order to match the engine characteristic--for example when employed in an internal combustion engine--to the requirements and to be able to achieve a higher torque, for example.
Advantageous details of the invention are contained in FIGS. 2 and 3. It will be explained below by means of an exemplary embodiment represented in FIGS. 1 and 2. Shown are in:
FIG. 1, a longitudinal section along the line AB in FIG. 2 of an exemplary
REFERENCES:
patent: 1996200 (1935-04-01), Hall
patent: 2247984 (1941-07-01), Densinger et al.
patent: 3603299 (1971-09-01), Lamperti
patent: 4418658 (1983-12-01), DiRoss
patent: 5558049 (1996-09-01), Dubose
patent: 5673663 (1997-10-01), Kim
Moulis Thomas N.
Striker Michael J.
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