JPH0311376Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in the rotor structure of a rotary piston engine, and particularly to a structure for preventing the occurrence of knocking.

(Prior Art) Conventionally, in a rotary piston engine, a rotor whose rotor housing is interlocked with planetary rotation has a recess for a combustion chamber on the rotor flank surface, as disclosed in Japanese Patent Application Laid-Open No. 53-48112, for example. A rotary recess having a concave portion is formed.

In such a rotary piston engine, when the rotor is in a position near compression top dead center, the gap between the combustion chambers is narrowed by the trochoid short shaft, so as the rotor rotates, the end gas on the trailing side A strong squishing flow is generated from the zone toward the leading side, and this squishing flow flows into the recess of the rotary recess, thereby increasing the combustion speed of the air-fuel mixture.

(Problem to be solved by the invention) However, in the above-mentioned conventional type, the concave portion of the rotary recess is simply recessed in the rotor flank surface, and the connecting portion between the rotor flank surface and the rotary recess surface is angular, so that the end gas The squish flow from the zone does not flow smoothly from the rotor flank surface to the rotor recess surface, but instead flows in the tangential direction of the rotor flank surface. For this reason, during flame propagation in the explosive combustion stroke, the flame heading toward the end gas zone collides with the above-mentioned squishy flow and the flame propagation to the end gas zone is inhibited, so that combustion in the end gas zone is not performed properly. Unburned components remain, and as a result, these unburned components self-ignite,
There is a problem in that so-called knocking tends to occur.

The present invention was made in view of these points,
The purpose of this is to smoothly guide the strong squish flow from the end gas zone to the recess of the rotary recess, and to prevent the flames heading towards the end gas zone from colliding with the squish flow, thereby improving flame propagation to the end gas zone. The objective is to reduce the remaining amount of unburned components by ensuring that the engine reliability is improved by increasing the limit of occurrence of knocking.

In that case, in order to guide the squish flow to the concave part of the rotary recess, it is conceivable to chamfer one step, for example, at the connecting part on the trailing side between the rotor flank surface and the rotary recess surface, but this idea does not allow for angular chamfering at the end of the chamfer. This area forms a heat point and becomes a cause of knocking, so the present invention aims to effectively increase the limit of knocking without creating such a heat point.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention provides a rotary piston engine in which a rotary recess is formed on the rotor flank surface as described above.
A plurality of inclined parts are formed at the trailing side connecting part between the rotor flank surface and the rotary recessed surface, and the inclination angle of the inclined part connected to the rotor recessed surface with respect to the rotor recessed surface is made larger than the inclination angle of the inclined part connected to the rotor flank surface. The structure is such that the squish flow during the explosive combustion process is guided to the concave portion of the rotary recess along the plurality of inclined portions.

(Function) With the above configuration, in the present invention, the trailing side connecting portion between the rotor flank surface and the rotary recess surface is connected by a plurality of inclined portions, and the inclination angle of each of the inclined portions is set from the rotor flank surface to the rotary recessed surface. During the explosion combustion stroke, the strong squish flow generated from the end gas zone flows smoothly from the rotor flank surface to the rotary recess surface along the plurality of slopes mentioned above, and is guided into the recess of the rotary recess. It turns out. As a result, the flame heading toward the end gas zone propagates well to the end gas zone without colliding with the above-mentioned squish flow, and combustion in the end gas zone is performed well, so that the remaining amount of unburned components is reduced. This will greatly reduce the occurrence limit of knocking. Further, since the connecting portion is smoothly continuous with a plurality of inclined portions, no heat points are created, and the above-mentioned knocking generation limit is ensured.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a schematic configuration of a rotary piston engine, in which 1 shows a rotor housing 2 having a two-bar trochoidal inner peripheral surface 2a, and two side housings (not shown) located on both sides of the rotor housing 2. 3 is a polygonal rotor that planetarily drives the inner circumferential surface 2a of the rotor housing 2 of the casing 1, and three rotor flank surfaces 3a, 3a, 3 of the rotor 3.
Rotary recesses 4, 4, 4 are formed in the central portion a, each having a recess 4a as a recess for a combustion chamber formed by recessing the rotor crank surface 3a.

Further, 5, 5, 5 are three working chambers defined by the outer peripheral surface of the rotor 3 and the inner peripheral surface of the casing 1, and the volume of each working chamber 5 is adjusted to the planetary rotational motion of the rotor 3. The intake, compression, explosion, expansion, and exhaust strokes are sequentially performed by changing the size accordingly, and near the compression top dead center, the trailing side of the combustion working chamber 5 is A strong squishing flow is generated from the end gas zone toward the trading side, and this squishing flow flows into the recess 4a of the rotary recess 4.

Each rotor flank surface 3 of the rotor 3
A and the rotary recess surface 4b of the rotary recess 4 at the trailing side connecting portion A (one of which is shown surrounded by a broken line in FIG. 1), as shown in enlarged detail in FIG. Third inclined portion 6a, 6b, 6
c is formed, and the inclination angle θa of the first inclined portion 6a connected to the rotor flank surface 3a with respect to the rotary recess surface 4b, the inclination angle θc of the third sloped portion 6c connected to the rotor recessed surface 4b, and the position between the two. The inclination angle θb of the second inclined portion 6b is formed to increase from the rotor flank surface 3a toward the rotary recess surface 4b (θa<θb<θc).

Therefore, in the above embodiment, a strong squishing flow is generated from the end gas zone of the combustion working chamber 5 near the compression top dead center, and this squishing flow flows into the rotary recess 4, so that the combustion speed of the air-fuel mixture is increased. .

At this time, the trailing side connecting portion A between the rotor flank surface 3a and the rotary recess surface 4b is connected by three sloped portions 6a, 6b, and 6c, and each sloped portion 6
Since the inclination angles θa, θb, and θc of a, 6b, and 6c are formed to increase from the rotor flank surface 3a toward the rotary recess surface 4b, the squish flow from the end gas zone is as shown by the solid line in Figure 2. As shown by the arrows, the fluid flows smoothly from the rotor flank surface 3a to the rotary recess surface 4b along the three slopes 6a, 6b, and 6c of the connecting portion A, and is guided to the recess 4a of the rotary recess 4. Due to this,
The flame heading toward the end gas zone (indicated by the broken line arrow in the figure) does not collide with the above-mentioned squish flow and propagates smoothly to the end gas zone, and combustion in the end gas zone is performed well. The residual amount of the component is greatly reduced, and the limit for knocking occurrence is increased. In addition, the connecting portion A is 3
Since the slopes 6a, 6b, and 6c are smoothly continuous, no heat points are created, and the knocking limit can be improved.

Incidentally, in the above embodiment, the trailing-side connecting portion A between the rotor flank surface 3a and the rotary recess surface 4b is formed by three sloped portions 6a to 6c, but it may be formed by two or four or more sloped portions. In short, it is sufficient that there are a plurality of inclined portions, and that the angle of inclination of each of the inclined portions increases from the rotor flank surface 3a toward the rotary recessed surface 4b.

(Effects of the invention) As explained above, according to the rotor structure of the rotary piston engine of the invention, the trailing side end can be heated without creating a heat point at the trailing side joint between the rotor flank surface and the rotary recess surface. The squish flow generated from the gas zone flows smoothly from the rotor flank surface to the rotary recess surface along multiple slopes, and is guided to the concave part of the rotary recess, thereby preventing the collision between the flames heading toward the end gas zone and the squish flow, and ending the end gas zone. The flame propagates well to the gas zone, ensuring good combustion in the end gas zone.
This makes it possible to effectively raise the limit of occurrence of knocking and improve engine reliability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram, and FIG. 2 is an enlarged view of the portion surrounded by a broken line circle in FIG. 1. 2...Rotor housing, 3...Rotor, 3a
...Rotor flank surface, 4...Rotary recess, 4
a... recess, 4b... rotary recess surface, 6a...
First slope part, 6b... Second slope part, 6c...
Third inclined part, A... Connection part, θa, θb, θc...
Tilt angle.

Claims (1)

[Scope of utility model registration request] In a rotary piston engine in which a rotor in which a rotor recess having a predetermined concave portion is formed in the rotor flank surface is planetarily driven in a rotor housing, a plurality of inclinations are formed at the trailing side connecting portion between the rotor flank surface and the rotary recess surface in the rotor. At the same time, the angle of inclination of the inclined part connected to the rotary recess surface is formed to be larger than the angle of inclination of the inclined part connected to the rotor flank surface, so that the squish flow in the explosion combustion process is directed to the plurality of inclined parts. A rotor structure for a rotary piston engine, characterized in that the rotor is guided along the recess into a recess of a rotary recess.