DE970088C - Pistons for internal combustion engines, compressors, etc. Like. With oil return openings - Google Patents

Description

The invention relates to pistons for internal combustion engines, compressors and the like the ring zones of the piston ^ or in the piston stick arranged oil return openings or e return chambers, which open into the interior of the piston. With the known »piston of this kind lies the inner opening of the oil return channels at the point at which the oil return channel and penetrate the inner wall of the piston, so usually directly on the Inner wall. This .has the consequence that the oil located on the inner wall of the piston during the reciprocating movement of the piston due to the inertia partially flush with the inner surface horizontal mouth enters the oil channel. As a result, under certain pressure and suction conditions oil from the interior of the piston get into the lubrication zone of the cylinder, what in view the resulting increased oil consumption is undesirable. The desired oil circulation is also achieved thereby impaired.

But it is also known to arrange oil return openings at such points on the shaft. which this has an annular bead on its inner wall

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shows. The oil return ducts open in this case on the ring bead. In this case too, however, there is a high possibility that the oil on the inner wall of the piston as a result of the inertia over the ringwust arrives and thereby enters the mouths of the oil channels lying on the bead. Also several Transverse webs or toroidal bead sections containing openings next to one another act as one ίο weir, which is the oil on the inside of the piston dams and finally causes it to overflow and flow into the mouths.

The invention aims to remedy this drawback. According to the invention, this is achieved by that the outlets of the oil return openings or channels in individual wart-shaped bumps the piston inner wall or short pipe sockets are inserted into the piston wall, which the Form oil return channels and close to the inner wall of the piston open out at a distance that protrudes beyond the oil film. The radially arranged oil return channels can in a known manner upwards or downwards against the horizontal plane be inclined.

· The arrangement of radially arranged pipes for the oil return is known per se, however it is a relatively long tube, which extends through one in the piston skirt the attached inner jacket protrude and the oil that has penetrated through the piston skirt into, lead the area of the connecting rod. In contrast to such double-walled pistons, which require a lot of construction, in which the purpose of the pipes intervenes in the passage of the oil through the space The piston outer and inner jacket is, the invention is limited to such a piston, in which the jacket is single-walled in the area of the oil S bores. At a such a piston, as it is mainly used for large-scale production in If, according to the previous knowledge, there would be no reason to consider the invention to use oil return pipes. Furthermore, a racing engine piston has become known, in which at the inner end of the oil return holes due to the drilling work a little more irregular A ridge is formed that has neither a closed ring nor a wart or a stool within the meaning of the invention and forms the passage of the oil from the inner wall of the piston into the bores cannot effectively prevent it. The main advantage of the invention is in that the penetration of the oil located on the inner wall of the piston into the oil return bores is largely made more difficult because the oil under the action of inertia on the cusps or other jumps, which contain the mouths of the oil return channels, inhibited in its course and is diverted laterally.

Further features and advantages emerge from the following description of the in the drawing illustrated embodiment.

Fig. Ι is a vertical section through a broken piston head;

Fig. 2 is a horizontal section through this piston head at the level of the oil return channels.

On the inside of the ring zone 1 of the piston 2 and 3 stools are formed in which the Outlets 4 and 5 of the oil return channels 6 and 7 are located.

The warts, stools or pipe sockets having the outlets can also only open a piston side, namely either on the pressure-loaded or on the pressure-relieved side of the Piston, provided.be, which is known per se in the arrangement of oil return openings in pistons is to influence the oil balance.

Claims (3)

PATENT CLAIMS: 1. Pistons for internal combustion engines, compressors and the like with arranged in the ring zones of the piston head or piston skirt, oil return openings opening out on elevations of the inner wall of the single-walled piston jacket or oil return channels, characterized in that the outlets the oil return openings or channels in individual wart-shaped cusps on the inner wall of the piston or short pipe sockets are inserted into the piston wall, which the oil return channels form and open out near the inner wall of the piston in a distance protruding beyond the oil film. 2. Piston according to claim 1, characterized in that the orifices having Warts, stools or pipe sockets only on the inside of the piston, namely either on the pressure-loaded or on the pressure-relieved side of the piston are provided. 3. Piston according to claim 1 or 2, characterized in that the oil return channels in As is known, the horizontal planes are inclined. Documents considered: German Patent No. 804048; British Patent No. 556 224; U.S. Patent Nos. 1,953,109, 2,108,194. 1 sheet of drawings © 509 696/272 2.56 (809 594/2 » &. 58)