DE3238030A1 - Twin-shaft engine - Google Patents

Abstract

The invention relates to a reciprocating piston internal combustion engine with two crankshafts (1) which are arranged in parallel, rotate in opposite directions and are each connected by connecting rods (3) to a common piston (5), either to a common gudgeon pin (4), which can be designed as a rocker lever (Fig. 3) or by means of two gudgeon pins (Fig. 4). Given an appropriate direction of rotation of the crankshafts (1), the angular motion of the connecting rods (3) relative to one another results in a rotary phase of the crankshafts (1) which is prolonged by the angle ( alpha ) during the intake or expansion stroke of the piston (5), while the rotary phase during the exhaust and compression stroke is reduced to the same degree (Fig. 1). Due to the symmetrical arrangement and function of the connecting rods (3), the piston and cylinder wall surfaces are not subjected to side forces. The prolonged intake stroke can be used to improve the charging of the cylinder with fresh gas or fresh air while the prolonged expansion stroke can be used to reduce consumption or increase power. The overall height of the piston can be reduced. <IMAGE>

Description

Dipl.-Ing.Alfred Wildanger 66o7 Qui Various

Beethovenstrasse 8

5 double shaft _-_ motor _i

The subject matter of the invention is a reciprocating internal combustion engine with two parallel and oppositely arranged mirror-like crankshafts, which are connected to connecting rods each with a common piston y whereby, given the appropriate direction of rotation of the crankshafts for the working stroke and the intake stroke, an extended rotational phase of the crankshafts results, than for the exhaust stroke and the compression stroke, and the piston and cylinder walls are relieved of laterally acting forces.

In conventional reciprocating internal combustion engines with a crank shaft, whose Technology is highly developed, the piston stroke between top and bottom dead center is only about half a time By swiveling the cylinder axis in the direction of the descending crank pin can be the descending piston stroke be slightly lengthened, but then the side forces increase on the piston and cylinder walls laugh to a considerable extent. Due to the changing angular position of each connecting rod to the stroke axis unilateral vibrations arise, which also lead to increased Lead friction between the piston and cylinder wall surface. To compensate for oscillating masses, there are variously counter-rotating masses Balance shafts arranged with counterweights, the piston height must be dimensioned relatively large to distribute the side forces. The working stroke of each piston is about half a turn the · crankshaft limited.

These disadvantages are inherent in the twin-shaft motor according to the invention.

construction

In the crankcase with the attached cylinder block, similar to the conventional reciprocating internal combustion engine, two mirror-identical crankshafts 1 are arranged parallel to each other at an appropriate distance and by gears or other precautions in opposite directions and frictionally precisely connected to one another in such a way that the radially opposite crank pins 2 when the crankshafts rotate 1

Alfred Wildanger
Twin shaft motor

Crankshafts 1, parallel to the piston pin plane, are always at the same height and symmetrical to the cylinder axis. Connecting rods 3 of the same length are arranged on each of the opposite crank pins 2 of both crankshafts 1, which are rotatably mounted there and on the piston pin k of the common piston 3 on the piston pin if fork-shaped and the other

ZfO connecting rod 3 arranged in this fork opening to a symmetrical Ensure power transmission (Fig. 2).

To compensate for slight tolerances in the movements of the connecting rod, the common piston pin Zf can be connected to one another by means of Eccentric rings 6 are designed as rocker arms, either

Zf5 the eccentric rings 6 are rotatably mounted on the piston pin Zf, or else connected to the piston pin k and this is rotatably mounted in the piston 5 (FIG. 3).

Another option is to use in the piston 5 for to arrange a separate piston pin for each of the two connecting rods 3 (Fig.Zf).

function

With an appropriate direction of rotation of the crankshafts 1, the crank pins 2 run on the inward stroke of the piston 5 on the outside to Cylinder towards and on the outward stroke on the inside away from the cylinder.

On the outward stroke of the piston 5, the path of the crank pin 2, depending on the length of the connecting rod 3 and the distance between the crankshafts 1 and the crank pin 2, is greater than half the circumference of the crank pin in one revolution by the angular amount OC Correspondingly, the path of the crank pin 2 on the inward stroke of the piston 5 by the angular amount OC is less than half the circumference. The stroke height H of the piston 5 is greater than the diameter of the circular movement of the crank pin 2.
With uniform rotation of the crankshafts 1 there is thus a longer piston stroke H for the intake and expansion stroke and a shorter piston stroke H for the exhaust and compression stroke Transferred half of each to the connecting rod 3 and the crank pin 2 of the ο crankshaft 1 via the piston pin Zf, without loading the piston 5 and cylinder wall surfaces with lateral forces.

Dipl.-Ing.Alfred Wildanger
Twin shaft motor

The piston stroke H can be in the area of the top dead center OT and the Bottom dead center BDC can be deliberately delayed by the crank pin 2 are slightly offset from one another in the sense of rotation, the differences at the ends of the connecting rods being caused by pivoting movements of the piston pin designed as a rocker arm (Fig. 3) be balanced.

The other components correspond to the known, conventional reciprocating internal combustion engines.

The main advantages of the double-shaft engine according to the invention ¹ compared to conventional reciprocating internal combustion engines are:

the extended intake stroke, which enables the cylinders to be better filled with fresh air or fresh gas; . the extended expansion stroke, which can serve both to better utilize the combustion gases to increase efficiency and to reduce consumption, as well as to increase output; the reduced _r friction of the piston on the cylinder wall, unloaded by side forces, in the high temperature range; the smooth running, due to the symmetrically opposing vibrating masses of the connecting rods and the crankshafts.

The twin-shaft engine can be used as a single-cylinder engine as well as a multi-cylinder in-line engine based on the Otto or diesel principle in the two-stroke or four-stroke process, or as a pump or Find compressor use.

In the drawing, the double-shaft motor is shown in a simplified way:
Fig. 1 Section through the double-shaft engine without crankcase,

Cylinder head and other known components, whereby the Crank pins are in the closest proximity. 1 oo Fig.2 Bearing of the connecting rod 3 on the piston pin if.

Fig. 3 arrangement of the eccentric rings 6 on the piston pin 4 as Rocker arm.

Fig. K Arrangement of two piston pins k in the piston 5 (schematic) Fig. 5 Stroke H of the piston 5 during a full revolution of the crankshaft 1 from bottom dead center BDC. The broken line represents the stroke of the piston of a conventional reciprocating engine :; dar (sine curve) -with the same lifting height.

Claims (1)

Dipl.-Ing.AIfred Wildanger
Twin shaft motor, "- 3238G30 Double shaft motor, characterized in that in one, conventional reciprocating piston engines with an attached cylinder block-like crankcase, two mirror-identical crankshafts 1 parallel, non-positive and rotatable in opposite directions Gears or similar interconnected and symmetrical are arranged to the cylinder axes in such a way that the radially opposite crank pins 2 of both crankshafts 1 in. each phase of rotation are at approximately the same height to the piston pin plane (Fig. 1) and the two opposite each other Connecting rod 3 of the crankshaft 1 with the common piston 5 via the common piston pin if, which is also known as a swing » lever · can be designed ('Fig.3) »are rotatably connected, where a connecting rod 3 is forked on the piston pin if, while the other connecting rod 3 in this fork opening is arranged (Fig. 2) 2 »double-shaft engine according to the preceding claim, characterized in that .that instead of the common piston pin Zj. for each connecting rod 3 a separate piston pin if can be arranged in the common piston (Fig, / +) Zo