TH38498A - Arrangement in 2-stroke, internal combustion engine - Google Patents

Abstract

The DC60 is an internal combustion engine (10) consisting of a number of engine cylinders (21) arranged in an annular configuration around a common central drive shaft (11). Each cylinder contains a pair of pistons (44, 45) that move toward and apart from each other, and a working (combustion) chamber (K) at the common central shaft for each pair of pistons. Each piston (44,45) is provided by its connecting rod (48,49) with its rollers (53) which together form supports against each other. A sine-curved cam (12a,12b) controls the relative motion of the pistons to the combined cylinders, and at least one of the two pistons (44, 45) in each cylinder (21) is axially adjustable within the cylinder. Specifically to adjust the compression ratio in the common working chamber (K), the internal combustion engine (10) consists of a number of engine cylinders (21) arranged in a ring-like configuration around a common central drive shaft (11). Each cylinder contains a pair of pistons (44,45) that move toward and apart, and a common central working chamber (K) for each pair of pistons. Each piston (44,45) is provided by each of its connecting rods (48,49) together with their roller supports (53), which act as supports for each of the sine-curved camshaft guides (12a,12b), which control the relative motion of the pistons to the combined cylinders, and where at least one of the two pistons (44,45) in each cylinder (21) is axially adjustable in the cylinder, specifically to adjust the compression ratio. The compression ratio in the joint working chamber (K) is as follows:

Claims (9)

1. An arrangement in an internal combustion engine (10) consisting of a number of engine cylinders (21) arranged in an annular configuration around a common drive shaft (11) and whose axis of the cylinders is parallel to the drive shaft. Each cylinder is fitted with a pair of pistons (44,45) that can move towards and away from each other and a working (combustion) chamber at the common center (K) for each pair of pistons, while each piston (44,45) is fitted with each connecting rod that moves along its axis (48,49), with the free outer end of the piston acting as a support against each annular section via roller supports (53), i.e. against sine-shaped cam guides (12a,12b) which are fitted at each opposite end of the cylinder (21) and which control the relative motion of the pistons with respect to the combined cylinders, which are characterized in such a way that at least One of the two pistons (44,45) in each cylinder is axially adjustable in the cylinder to adjust the relative clearance between the two pistons and, in particular, to adjust the compression ratio (K) in the working chamber between the two pistons. 2. The arrangement in claim 1 is characterized in such that the position of the piston (44,45) in cylinder (21) is adjusted to be limited by the combined cam-type guide devices (12a,12b) of the piston by means of a separate adjustable control arrangement (13b). 3. The arrangement in claim 1 is characterized in such a way that 1 such cam-type guide device (12b) is able to move axially along the drive shaft (1) in a manner of sliding on this part and can be adjusted within the limited length of the drive shaft (11) by means of such separate control arrangement (13b). 4. The arrangement in claim 3 is described in such a way that the control arrangement (13b) can be adjusted by means of pressurized oil. 5. The arrangement in claim 4 is characterized in such a way that the control arrangement shall consist of an annular pressurized oil chamber (13b) which is confined between the drive shaft (11) and the camshaft guide (13b) which is confined between the drive shaft (11) and the camshaft guide (12b) and the compression fitting which is a piston (12b'') which extends radially inward from the camshaft guide (12b) into the pressurized oil chamber (13a) and which is separated into two chambers, namely each on each side of the compression fitting, and each chamber is connected to its mutually optimized pressurized oil circuit. 6. Any of the arrangements in claims 1 through 5 are characterized in such that a cam-type guide device (12b) is fixed in place so that it rotates together with the drive shaft (11). A compression immobilizer (12b) is inserted parallel to the axis of the drive shaft (11) by a set of drive bolts (12b'') which cause the compression immobilizer (12b'') to have a certain degree of axial movement relative to the drive shaft (11), while the drive bolts (12'') are connected at each opposite end of it to the drive shaft (11) and connected to the bearing element (13) which is fixed to the drive shaft (11). 7. The arrangement in claim 6 is characterized in such that the drive shaft (11) is extended axially at its outer end in the form of a radially tapered end, which is firmly connected to the bearing element (13) in the form of a cup-shaped end piece. A pressurized oil chamber (13b) is positioned specifically between the drive shaft (11) and the cup-shaped bearing element (13). 8. The arrangement in claim 6 or 7, which is described as such that the oil guide element (14), which extends axially through the axial hole in the cup-shaped bearing element (13) and also enters internally into the axial hole in the drive shaft (11) which is arranged in line with the first such element, shall be provided with a pair of pressurized oil pipes (14a,14b) which extend axially internally and open externally radially into each of its associated pressurized oil ring sections (14a'',14b''), which are connected to the pressurized oil pipes (11f,11g) that go to each sub-chamber of the pressurized oil chamber (13b). 9. Any arrangement under claims 1 through 8, which is described in such a way that one piston (44) of cylinder (21) which will adjust the position of the assembled cylinders will also form a piston which controls the opening and closing of the exhaust port (24) of the cylinders. (Clause 9, 2 pages, Figure 18)