Power plants – Motor operated by expansion and/or contraction of a unit of... – Unit of mass is a gas which is heated or cooled in one of a...
Reexamination Certificate
2001-04-13
2002-09-03
Denion, Thomas (Department: 3748)
Power plants
Motor operated by expansion and/or contraction of a unit of...
Unit of mass is a gas which is heated or cooled in one of a...
C060S518000, C123S241000, C418S051000, C418S068000
Reexamination Certificate
active
06442935
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a driving system which is designed for use in various types of machines, such as combustion engines, pumps, compressors and the like.
BACKGROUND OF THE INVENTION
The driving system according to the invention comprises a housing having a spherical hollow space, a rotatable main shaft, a driving means drivingly connected to the main shaft and a piston construction connected to the driving means, where the the piston construction is rockable backwards and forwards in the hollow space relative to a stationary wall portion in the hollow space and where one end of the driving means which participates in the rotary motion of the main shaft, is pivotally mounted in the main shaft about a pivotal axis which forms an acute angle with the axis of rotation of the main shaft.
Various driving systems of the afore-mentioned kind are known. There are employed a housing with a spherical hollow space, a rotatable main shaft and one or more pistons which are moved backwards and forwards in a forced rocking motion in the spherical hollow space, where the piston/pistons constitute a driven or a driving component of the driving system.
In DE 466 916 there are employed a pair of semi-spherical chambers on opposite sides of a stationary, first partition plate, which extends radially, that is to say across the rotational axis of the driving system centrally in the spherical hollow space. A rigid main shaft part passes through the spherical hollow space and is rotatably mounted via opposite, mutually aligned shaft pins at opposite ends of the housing. The shaft pins carry their respective laterally displaced, globular cup-shaped transition portion having an intermediate centre pin (driving means), which extends obliquely of the rotational axis of the main shaft. The centre pin is rotatably mounted internally in a piston construction consisting of a pair of conical pistons. The pistons are subjected to an unrolling motion on opposite sides of such a first, radially extending partition plate in their respective semi-spherical chambers. In each semi-spherical chamber two work chambers are defined by means of a second, axially extending partition plate, which connects conical portions of the pistons to each other and which passes through a slot in the first radially extending partition plate, something which creates special sealing problems in between the partition plates.
In U.S. Pat. No. 4,938,025 a similar system is shown, where the second partition plate is avoided and simultaneously the sealing problems which accompany such a through-passing partition plate are avoided. Instead the first partition plate is rockably mounted about a rocking axis, which extends across the rotational axis of the main shaft.
In both of the of afore-mentioned known solutions, where pistons are employed, which are subjected to combined rocking and pivotal movement, one is dependent upon the pistons being subjected to a seal-forming unrolling movement along the associated (first) partition plate. In practice it is difficult to ensure precise sealing via the pistons, since during use there will necessarily occur significant wear between the partition plate and the pistons, by the very fact that the pistons are rolled directly against the partition plate.
In U.S. Pat. No. 5,147,193 a solution is shown, where said seal-forming unrolling motion is avoided. Instead a sliding sealing abutment is employed between the pistons and the partition plate. The main shaft part comprises a rotatable, axially extending partition plate, instead of the radially extending, that is to say the transversely extending partition plate. Together with the partition plate there is rotatably mounted a piston construction comprising a pair of mutually rigidly connected ball segment-formed, that is to say orange boat-formed pistons. By this solution the combined rockable and pivotable motion of the pistons relative to a locally arranged partition plate is avoided. This is achieved by allowing the partition plate and the pistons to rotate jointly and by allowing in addition the rotatable pistons to be set in a rectilinear rocking motion relative to the rotatable partition wall.
The piston construction during its rotational movement is forced into a rocking motion backwards and forwards relative to the partition plate via a stationary journal and a rotatable control member, which is moveable in an oblique plane relative to the rotational axis of the main shaft. The piston construction is subjected to considerable rocking movement relative to the partition plate and in addition participates in the rotational movement together with the partition wall. It is a significant practical problem that large rotational forces occur centrally in the rotor member via the stationary journal and the associated rotatable control member.
In U.S. Pat. No. 1,434,741 a pump is shown having a rotatable main shaft, which is connected to a disc-shaped piston via a piston rod rigidly connected to the piston, the longitudinal axis of which extends obliquely of the rotational axis of the main shaft. A stationary pump housing is employed having a part-spherical, central hollow space, which spans over an arc angle of about 30° relative to a spherical centre point. The hollow apace is divided by means of a stationary, axially extending partition plate, which passes through the piston via a transversely extending slot in the piston. The partition plate forces the piston into a combined rocking and pivoting movement relative to a conical stop in the surrounding pump housing. Consequently in a corresponding manner as in DE 466 916 one is dependent upon a complicated sealing abutment in a slot between two relatively moveable parts, of which the piston executes a combined sliding and rolling off movement. One end of the piston rod extends at right angles to the disc-shaped piston, while the opposite end of the piston rod, which participates in the rotational movement of the main shaft, is pivotally mounted in a head portion of the main shaft part, eccentrically about the rotational axis of the main shaft. Consequently one is compelled to employ a relatively narrow hollow space in the pump housing in combination with the stationarily arranged partition plate.
With the present invention the aim is a constructionally and operatively favourable solution, which provides a simple piston movement and minimal sealing problems.
As the state of the art in the area is taken the particular starting point of the solution according to U.S. Pat. No. 1,434,741. Inter alia in this connection the aim is to employ a considerably larger spherical hollow space than in the solution according to U.S. Pat. No. 1,434,741 plus avoiding the axially extending partition wall and the sealing problems connected therewith.
SUMMARY OF THE INVENTION
The driving system according to the present invention is characterised in that the piston construction, which comprises a pair of mutually rigidly connected pistons, is rockable relative to the surrounding housing about a first rocking axis, which passes centrally through the spherical hollow space at right angles to the rotational axis of the main shaft, that the piston construction is rockable towards and from an intermediate, stationary wall portion, which projects radially inwardly into a first hollow space section of the spherical hollow space and divides the hollow space section into two opposite work chambers, that the other end of the driving means is rockably mounted in the piston construction about a second rocking axis, which extends at right angles to the first rocking axis, the first and second rocking axes crossing the rotational axis of the main shaft at a common crossing point centrally in the spherical hollow space.
According to the invention three parts moveable relative to each other are employed instead of two parts moveable relative to each other according to the known solution, as shown in U.S. Pat. No. 1,434,741.
In the known two-part solution the piston is subjected to a rolling off movement, that is to say
3D International A/S
Denion Thomas
Shanks & Herbert
Trieu Thai-Ba
LandOfFree
Driving system for machinery, such as a motor, compressor etc. does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Driving system for machinery, such as a motor, compressor etc., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Driving system for machinery, such as a motor, compressor etc. will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2887153