DE20210523U1 - Pendulum piston engine with improved lubrication - Google Patents

Description

Pendulum piston engine with improved lubrication

The invention relates to a pendulum piston engine according to the preamble of claim 1.
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Pendulum piston engines are known as two- and four-stroke engines. For example, DE 33 03 509 A1 describes a two-stroke machine with two double-acting pistons. It consists of a cylinder with a central shaft on which the pistons are arranged opposite one another in a web-like manner, which oscillate between the cylinder heads that protrude like a web from the cylinder wall into the cylinder. The pistons are sealed against the cylinder wall and the cylinder heads against the piston shaft. There is an overflow channel in the piston shaft.

Furthermore, from DE 43 24 097 Al a four-stroke internal combustion engine is known consisting of a 270° circular hollow cylinder with pivoting pistons working therein.

DE 36 16 376 A1 describes an internal combustion engine in which a symmetrical disk in a spherical cylinder, which is cut in a V-shape at the top and bottom, performs a movement alternating from left to right.

The disadvantage of these pendulum piston engines is the control of lubrication and the seal between the pendulum piston and the cylinder wall.

The object of the invention is to optimize the lubrication and sealing between the pendulum piston and the cylinder wall. This object is achieved with the features of claim 1, advantageous embodiments are the subject of the subclaims.

In the pendulum piston engine according to the invention, consisting of a cylinder which has opposing V-shaped cylinder heads which protrude into the cylinder and are sealed off from the pendulum piston shaft, and two pendulum pistons arranged opposite one another on the pendulum piston shaft and which are sealed off from the cylinder, it is provided that the pendulum pistons are each arranged in a groove in the pendulum piston shaft

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are arranged to be displaceable in the direction of the cylinder wall, the pendulum piston shaft has, in at least one section, a lubricant bore which runs in the longitudinal direction of the pendulum piston shaft and which is connected via one or more channels to a lubricant groove of the pendulum pistons in the sliding region of the pendulum pistons on the cylinder wall.

During operation, the pendulum pistons are optimally pressed against the cylinder wall due to centrifugal force and are sufficiently supplied with lubricant.

It is also advantageous if at least one channel is used as a lubricant inlet to the lubricant groove and at least one channel is used as a lubricant outlet. This allows the lubricant to circulate and to a certain extent also serve for cooling.

In one embodiment, the pendulum pistons are pressed towards the cylinder wall as a result of a force applied at the base in addition to the centrifugal force. This can be achieved by means of springs.

An advantageous embodiment according to the invention provides that this is done by means of lubricant, in that the base of the pendulum piston is supplied with lubricating oil introduced into the groove in which the pendulum pistons are each slidably mounted. 20

In order to ensure optimal lubrication of the pendulum pistons on the front side, one embodiment of the invention provides that the channels to the lubricant groove of the pendulum pistons each run on the front side from the foot of the pendulum piston to its head and are designed as a groove.

An embodiment of the invention is shown in the drawing.

Fig. 1 Pendulum piston engine in perspective view and Fig. 2 Pendulum piston engine in section.
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Fig. 1 and 2 show a pendulum piston engine consisting of a cylinder with cylinder wall 1, which has opposite V-shaped cylinder heads 11 projecting into the cylinder, which are sealed against the pendulum piston shaft 2, and

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two pendulum pistons 3, 4 arranged opposite one another on the pendulum piston shaft 2, which are sealed against the cylinder wall 1.

The pendulum pistons 3, 4 are each arranged in the pendulum piston shaft 2 in a groove 5 so as to be displaceable in the direction of the cylinder wall 1, so that they are pressed against the cylinder wall 1 solely as a result of the centrifugal force.

The pendulum piston shaft 2 has, in at least one section, a lubricant bore 6 running in the longitudinal direction of the pendulum piston shaft, which is connected via one or more channels 7, 8 to a lubricant groove 9, 10 of the pendulum pistons 3, 4 in the sliding area of the pendulum pistons 3, 4 on the cylinder wall 1. In the embodiment shown, the channels 7, 8 to the lubricant groove 9, 10 of the pendulum pistons 3, 4 each run on the front side from the base of the pendulum piston 3, 4 to its head and are designed as a groove.
The channel 7 serves as an inlet for lubricant to the lubricant groove 9, 10 and a channel 8 serves as an outlet for lubricant.

Furthermore, it can be seen that the base of the pendulum pistons 3, 4 is pressurized in the direction of the cylinder wall 1 by lubricating oil introduced into the groove 5 in which the pendulum pistons 3, 4 are each slidably mounted.

The illustrated pendulum piston engine has another special feature, namely that the cylinder heads 11 in the sealing area to the pendulum piston shaft 2 are designed as bearings 12 for the pendulum piston shaft 2. They can be spring-loaded in the direction of the pendulum piston shaft 2 or pressurized with oil. This increases the smoothness of operation and allows for larger dimensions, particularly in relation to the length of the pendulum piston shaft 2, without sealing and/or lubrication problems occurring.

List of reference symbols Cylinder wall 1 Oscillating piston shaft 2 Pendulum piston 5 3 Pendulum piston 4 Groove 5 Lubricant hole 6 channel 7 channel 10 8 Lubricant groove 9 Lubricant groove 10 Cylinder head 11 Pendulum piston shaft bearing 12

Claims (6)

1. Pendulum piston engine comprising a cylinder which has opposing V-shaped cylinder heads which protrude into the cylinder and are sealed with respect to the pendulum piston shaft, and two pendulum pistons which are arranged opposite one another on the pendulum piston shaft and are sealed with respect to the cylinder, characterized in that the pendulum pistons ( 3 , 4 ) in the pendulum piston shaft ( 2 ) are each arranged so as to be displaceable in a groove ( 5 ) in the direction of the cylinder wall ( 1 ), the pendulum piston shaft ( 2 ) has, in at least one section, a lubricant bore ( 6 ) which runs in the longitudinal direction of the pendulum piston shaft and which is connected via one or more channels ( 7 , 8 ) to a lubricant groove ( 9 , 10 ) of the pendulum pistons ( 3 , 4 ) in the sliding region of the pendulum pistons ( 3 , 4 ) on the cylinder wall ( 1 ). 2. Pendulum piston engine according to claim 1, characterized in that the channels ( 7 , 8 ) to the lubricant groove ( 9 , 10 ) of the pendulum pistons ( 3 , 4 ) each run on the front side from the foot of the pendulum piston ( 3 , 4 ) to its head and are designed as a groove. 3. Pendulum piston engine according to claim 1 or 2, characterized in that a channel ( 7 ) serves as an inlet for lubricant to the lubricant groove ( 9 , 10 ) and a channel ( 8 ) serves as an outlet for lubricant. 4. Pendulum piston engine according to one of claims 1 to 3, characterized in that the pendulum pistons ( 3 , 4 ) are pressed in the direction of the cylinder wall ( 1 ) as a result of a force effect on the base introduced in addition to the centrifugal force. 5. Pendulum piston engine according to one of claims 1 to 4, characterized in that the foot of the pendulum pistons ( 3 , 4 ) is pressurized in the direction of the cylinder wall ( 1 ) by lubricating oil introduced into the groove ( 5 ) in which the pendulum pistons ( 3 , 4 ) are each displaceably mounted. 6. Pendulum piston engine according to one of claims 1 to 5, characterized in that the cylinder heads ( 11 ) in the sealing area to the pendulum piston shaft ( 2 ) are designed as bearings ( 12 ) for the pendulum piston shaft ( 2 ).