SU1240941A1 - Cylinder-piston unit of internal combustion engine - Google Patents

Description

The invention relates to mechanical engineering, in particular to internal combustion engines, and can be used in crankcase-chamber engines.

The purpose of the invention is to reduce the consumption of lubricating oil and increase the efficiency of lubrication.

The drawing schematically shows a cylinder piston group.

The cylinder piston group contains a piston 1 with a rod 2, an oil wiper 3, two oil wipers 4. Radial bores 5 and 6 are made in the bottom, e piston to drain the oil. On the rod made channels for the supply of 7 and outlet 8 lubricating oil. On the ring of the inlet channel, a plug 9 is installed. A spring-loaded plunger 10 with a check valve is placed in the outlet channel. The cavity between the oil wiper rings is connected to the supply channel by the radial channels 11. The radial bore holes 12 are made in the channel for the installation of the lower oil wiper ring 12. The check valve is equipped with a spring 13.

The device works as follows.

Lubricating oil is supplied to the wall of the cylinder through channels 7 and 11. When the piston moves downward, the oil removed by the upper oil scraper ring passes through the opening 5 into the bottom cavity of the piston, and the plunger 10 passes inertial through the non-return valve butter. The oil, which is located in the cavity between the piston and the oil outlet cup, through the opening 6 enters the cavity of the piston head.

When the piston moves upward, the oil removed by the lower oil scraper ring enters the cavity between the piston and the oil suction cup through the opening 12 and accumulates in the lower part of this cavity.

In the process of the engine piston 1 with the rod 2 and installed in it

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reusable piston 10 with a check valve makes a reciprocating motion. In this case, the engine parts are affected by inertia forces, which in one stroke of the piston change their direction. When piston 1 moves from TDC to mid-stroke of piston 1, the inertia forces are directed toward TDC, plunger 10 moves in the same direction, stretching spring 13 and slows down its movement, and lubricating oil flows through the check valve through channel 8 into crankcase the operation of the plunger 10, and under the action of excess pressure above the plunger 10.

Approximately from the middle of the stroke of the piston 1, when oi continues its movement towards the NMT, the inertia forces change their direction due to a decrease in the velocity of pressure 1, i.e. the inertia forces are directed toward the NMT.

Under their action, as well as under the action of the force stored in the spring 13, the plunger 10 begins to move to the BDC and the check valve closes due to the pressure difference before and after the plunger 10. In the channel 8 between the plunger 10 and the crankcase an overpressure is created due to forced displacement of the lubricant oil plunger 10. In channel 8 above the plunger 10, a vacuum is created, which leads to a decrease in pressure in the cavity between the oil wiper rings 4, as well as to a forced flow of lubricating oil into the drain channel.

When piston 1 moves from HMT to BHT, the described processes are repeated in reverse order.

Thus, the presence of a spring-loaded plunger with a valve allows to intensify the discharge of lubricating oil, to reduce the pressure between the oil wiper rings, which reduces the breakthrough of lubricating oil through the rings into the over piston and sub piston cavities.

Claims (1)

CYLINDER-PISTON INTERNAL COMBUSTION ENGINE GROUP, containing a piston with oil scraper rings placed in the cylinder and articulated with a connecting rod, and a lubrication system formed by supply and exhaust channels made in the piston and connecting rod and connected in series with one another and connected to one another that, in order to improve efficiency, the lubrication system is equipped with a spring-loaded plunger with a check valve placed in the outlet channel of the connecting rod with the possibility of axial movement, and subvalve the second cavity is located on the side of the piston rings.