JPS63501302A - Cooling of pistons in rotating piston internal combustion engines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Cooling of the piston of a rotary piston internal combustion engine The present invention is directed to a trochoidal two-arc outer cylinder. It has a housing consisting of a middle part having a running surface and two side parts. An eccentric wheel shaft passes through the ring vertically, and a triangular piston is eccentrically mounted on the eccentric wheel. It rotates with a transmission ratio of 2:3 to the rotation of the core wheel shaft, and the piston has a flow through it. rotary piston internal combustion engine, adapted to be cooled by a fuel-air mixture that Regarding the cooling of Seki's piston.

Such a machine is shown in FIG. 7 of DE 255 347 (DE 256 0063), in which a partial flow of the fuel-air mixture is used for piston cooling. side intake openings through the piston and through passages in one or both side walls to guided by. In that case, since this substream is a fertile mixture, it contains The fuel evaporates on the hot inner wall of the piston, resulting in better cooling and simultaneous processing of the fuel is accomplished. At that time, the fuel supply to the combustion air is carried out by the carburetor. will be held. Suction air or fuel-air mixture for piston cooling purposes The introduction of the It is.

However, the air in such a piston also 2) Mixture cooling is not sufficient, especially when the machine is loaded with relatively high loads, especially when loaded with heat. The loaded parts cannot be cooled any more than the lower loaded parts.

The heat distribution in the piston is caused by flame propagation in the direction of rotation and therefore Highest temperature at and near the center of the leading piston angle in the leading part of the side However, the side of the piston that runs behind remains relatively cold. 500° Temperatures at full load reaching up to C result in carbonization of the oil, so Lubricating the sealing elements becomes a problem and these sealing elements are baked in their grooves. Ru. This results in leakage from the working chamber, increased wear and damage to the machine. Become. Conventionally, this is achieved by cooling the inside of the piston accordingly with air. Attempts are made to reduce the temperature by additional cooling ribs on the housing. but However, the problem is always heat transfer in the direction of the piston bearing, so housing cooling It must be kept without affecting. On the other hand, the gas itself can cause the piston to Internal cooling is used when the flow is in a particularly favorable direction towards hot corner areas. can be substantially strengthened.

The problem of the present invention is that in the machine mentioned at the beginning, the piston side surface is loaded with high temperature. achieving more effective cooling of the piston in the area of the leading part; and therefore possible in the case of such machines with fluid-cooled pistons Such machines with air- or mixture-cooled pistons, such as Another aspect of the present invention is to enable the machine to be used even under high loads. The challenge is to carry out effective treatment of the fuel in the same way before the fuel-air mixture enters the working chamber. It is a step.

Embodiments of the invention will now be described in detail and illustrated by the drawings. In these drawings , Figure 1 shows a piston in perspective view with an indication of the thermal distribution during full load; Figure 2 shows a radial cross-section of the machine according to the invention taken along the plane ■-■ of Figure 3; , Figure 3 shows an axial section of the same machine taken along the plane ■-■ in Figure 2; Figure 4 shows the radial direction as in Figure 2 with the position of the piston at the beginning of injection. Figure 4 shows a cross-section, Figure 5 has the position of the piston at the end of injection; The same radial cross section is shown.

Figure 1 shows the air cooling of the machine mentioned at the beginning at 5500 rpm and full load. The figure shows the temperature distribution on the side surface of the piston. The piston edge running behind is Habo 3 It has a temperature of 10 to 320°C. In the direction of the leading piston edge C, The temperature of the piston recess d increases from 400 to 450 °C, increasing the temperature of the leading recess end. Near the piston edge C that runs first in the middle (e reaches 490°C. These temperatures are: This causes carbonization of the oil, which is incompatible with the operation of such machines.

The radial cross section of FIG. 4 shows a housing having a two-arc trochoidal outer cylinder running surface 2. 3 shows the middle part 1 and the right side part 3 in FIG. 3 through which the eccentric shaft 4 passes vertically. . On the eccentric wheel 4, the piston 6 rotates in a planetary motion. piston 6 has angles 8.9.10. During its movement, the piston alternately fills the suction and compression chambers. 11, an expansion chamber 12 and an exhaust chamber 13 are formed.

The combustion air intake must be opened after the piston 6, as shown on the left in Figure 3. In the recess 16 in the side 17 it is rubbed by the sealing strip 15 of the piston 6. The piston corner 8.9.10 is made through the intake connection piece 14 into the recess 16 that is not through openings 18 provided in these in the area of The seal of the piston 5 must be located in the recess 20 on the right-hand side 3 in FIG. It flows into the recess 2o which is not rubbed by the strip 19. The recess 20 is Similarly, it is connected to a side intake port (not shown), which is a recess in the side part 3.

The suction air then flows through the piston 6 in a direction from left to right in FIG.

The side part 3 has an injection nozzle for the front corner of the side inlet of the recess 20, viewed in the direction of rotation. A jet 21 is provided, the jet 22 of which flows as shown in FIG. At the position of the piston 6 just before reaching the lower dead center position, the tip of the expansion chamber 1 and 2 is It is directed towards the middle of the inside 23 of the corner 10 that runs. Inside the leading corner IO of the expansion chamber 12 The front part 24 of the side 7 of the piston 6 which is passing through the side 23 and is to be present in the expansion chamber 12 , therefore passing through the inner side following said inner side 23 of the hottest area shown in FIG. An injection control period occurs. The injection nozzle 21 projects beyond the side wall 25 of the side part 3 not present. The inner wall 27 of the piston 6 carrying the eccentric bearing 26 provides a In order to create space, it is retracted to the width of the eccentric wheel 5.

Advantageous control periods are shown in FIGS. 4 and 5, in which case FIG. indicates the piston position at the beginning of the flow, at which point the centerline of the jet 22 is It cuts the leading corner 10 of the expansion chamber 12, so that the impingement surface of the jet 22 crosses this corner 10. The area of the piston inner wall preceding 0 has not yet been reached. Figure 5 shows the same piston Injection cycle at the piston position where the angle IO has just scraped the exhaust opening 28 Indicates the end of the file.

According to this arrangement, the hottest region of the piston 6, in particular the piston angle 8.9.10 This ensures that the sealing part 15.19 is cooled. At the same time, there are rumors that the fuel will be processed well. H63-501302 (3) and intimate mixing with combustion air. Because the injection passes through the piston The hot inner wall of the piston prevents the air from flowing in the direction of the suction air. A turbulent flow of the reduced fuel is thereby achieved together with the suction air. working chamber - because a homogeneous fuel-air mixture is already formed when it enters. Ru.

international search report “1”01-11”’PCT/DE 85100444ANN3XTOτ;+ E rNTERNATrONAL 5EARCHFC? ORT　0NINTER NATIONAL APPLICATION No, PCT/DE 8510 0444 (SA 11347) DE-B-1136532None FR-Person-1341373None CB-A-927585None F’R-A-571728None US-A-3196852None

Claims (1)

[Claims] 1. It consists of a middle part with a trochoidal two-arc outer cylinder running surface and two side parts. It has a housing with an eccentric shaft passing through the housing vertically. A triangular piston rotates on the center wheel with a transmission ratio of 2:3 to the rotation of the eccentric wheel shaft, and The piston is now cooled by the fuel-air mixture flowing through the piston. In cooling the piston of a rotating piston internal combustion engine, the side wall (3) is The injection nozzle (21) is arranged from 30° to 10° before reaching the bottom dead center position. When the piston (6) runs past the position that exists within the rotation of the eccentric shaft (4) at The axis of the jet (22) of the fuel injection nozzle (21) is aligned with the respective expansion chamber. (12) at the corners (8, 9, 10) of the piston (6) preceding and these corners (8, 9, 10) is oriented toward the axial center of the inside (23). Cooling of pistons in rotating piston internal combustion engines. 2. The injection nozzle (21) is arranged against the corner of the front side intake opening when viewed in the direction of rotation. Piston of a rotary piston internal combustion engine according to claim 1, characterized in that: Cooling of stone. 3. The flow direction of the suction air flowing through the piston (6) is in the direction of the jet (22). A rotary piston internal combustion engine according to claims 1 and 2, characterized in that the engine runs toward the cooling of the piston. 4. The beginning of the injection cycle is at the leading corner (8, 9, 10) of the expansion chamber (12). Each corner (8, 9, 10) of the piston (6) is aligned with a straight line on the axis of the jet. is determined by the position of the piston (6) and the end of the injection cycle is determined by the position of the piston (6). The leading corners (8, 9, 10) of the tension chamber (12) rub against the exhaust opening (28). Rotating piston internal combustion engine, characterized in that it is determined by the position of the piston (6) cooling of the piston.