JPS591335B2 - Rotary piston engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an intake system for a low-return piston engine.

In general, the intake system for rotary piston engines is
There are two types: peripheral intake boat type and side intake port type.

Side intake boat system. The passage resistance is large because the direction of the intake air flow is changed in a complicated manner, and since the intake port is completely covered by the side surface of the rotor until the intake stroke of the preceding working chamber ends and the intake stroke of the succeeding working chamber begins, the intake port There is a drawback that the intake air flow inside the pump is interrupted, and due to this intake resistance and interruption of the intake air flow, sufficient filling efficiency cannot be obtained and high output cannot be obtained.

On the other hand, with the peripheral intake port method, the flow of intake air is smooth, and the opening and closing of the port is controlled by the apex seal, and at the end of the intake stroke of the preceding working chamber, the apex seal passes through the starting line of the intake port. Until it passes the edge, the intake port opens across the preceding working chamber and the following working chamber, and the intake air flowing through the intake port becomes a continuous flow, increasing the filling efficiency compared to the side intake boat method. The output can be guaranteed.

However, even with this peripheral intake port system, there is still room for improvement in racing engines that require higher output.

In other words, when the apex seal is on the intake port, the intake air flowing through the intake port basically flows into both working chambers, but at this time, the leading part of the succeeding working chamber is caused by the rotor flank reaching the intake port. Since they are very close together and extremely flat, the intake port is substantially blocked by the flank surface, making it impossible to maintain sufficient intake inertia within the intake port.

The present invention has been made in view of the above-mentioned conventional problems, and
In addition to the position of the starting line of the peripheral intake boat and the position of the trailing side end of the low recess, we also devised the shape of the inner wall surface on the trailing side of the intake passage, so that each time the peripheral intake boat is opened or closed using the apex seal, An intake system for a rotary piston engine that improves the filling efficiency of intake air by creating a continuous intake wave that is not blocked by the rotor flank, and by supercharging using the inertia of the intake air flow. This is provided to all new customers.

Embodiments of the invention will now be described in detail with reference to the accompanying drawings.

As shown in the figure, a rotary piston engine 1 includes a polygonal rotor 4 that rotates planetarily while sliding an apex seal 3 on a top portion 4a within a rotor housing 2 having a trochoidal inner peripheral surface. The top part 4a
The interior of the rotor housing 2 is divided into three working chambers 5, 6 .
It is configured to be divided into 7 sections.

The rotor housing 2 is provided with a peripheral intake boat 8 and a peripheral exhaust port 9, while a rotor flank 10 of the rotor 4 is provided with a concave rotary recess 11.

Therefore, firstly, the starting line 8a of the peripheral intake boat 8
is formed so as to be located slightly on the trailing side from the leap ink side starting end 11a of the rotary recess 11 in the illustrated rotor posture immediately before the apex seal 3 passes through the starting point i8a and reaches the terminal end 8b of the peripheral intake port 8. .

Second, the trailing side end portion 11 of the rotary recess 11
b is located on the trailing side from the short axis position of the rotor housing 2.

Third, the rotor housing 2 connected to the intake boat 8
Trailing side inner wall surface 1 of intake passage 12 formed inside
2a is tilted so that the intake air flow is deflected in the trailing direction.

The starting line 8a' of the conventional peripheral intake port 8 and the inner wall surface 12a' of the intake passage 12 are illustrated with two-dot chain lines for reference.

For the first configuration, the conventional peripheral intake boat 8
If the starting line 8a' of If it is the starting line 8a, just before the apex seal 3 reaches the terminal edge 8b of the peripheral intake port 8, the leading side starting end 11a of the rotary recess 11 reaches the starting line 8a of the peripheral intake boat 8, so the peripheral intake The intake air flow from port 8 is
The air is supplied from the preceding working chamber 5 to the following working chamber 6 without interruption, resulting in a continuous intake flow.

Therefore, in combination with inertial supercharging in the intake passage, the intake air filling efficiency is greatly improved.

Immediately before the apex seal 3 reaches the terminal edge 8b of the peripheral intake port 8 means that the apex seal 3 and the terminal edge 8b
Regarding the relationship between the angle of the eccentric axis of the rotor 4 and
degree range is optimal.

Regarding the second configuration, the trailing side terminal end 11b of the rotary recess 11 is located on the leading side from the short axis position of the rotor housing 2, that is, the point where the rotor housing 2 and the rotor 4 are closest to each other and the passage resistance is maximum. Once positioned, a flow of intake air toward the subsequent working chamber occurs, but it is virtually impossible to improve the filling efficiency by this flow because the passage is constricted by the short axis position. On the other hand, by locating the trailing side terminal end 11b of the rotary recess 11 on the tray link side from the above-mentioned short axis position as in this embodiment, intake air can be smoothly drawn into the combustion chamber on the downstream side of the short axis position. Ni style nine.

Continuous intake flow improves filling efficiency.

Regarding the third configuration, the trailing side wall surface 12a of the intake passage 12 formed in the rotor housing 2 is arranged substantially parallel to the conventional trailing side wall surface 12a', and the trailing side wall surface 12a of the intake passage 12 formed in the rotor housing 2 is positioned more closely than the conventional trailing side wall surface 12a'. When formed on the ring side, the intake air flows almost along the side of the intake passage, so the intake air sucked into the subsequent working chamber first hits the rotor flank, and then flows in the direction along the rotary recess 11 at approximately right angles. It changes its direction and flows into the subsequent working chamber.

Therefore, for the reasons mentioned above, if only the first and second configurations are used, the intake port 8 section becomes a passage resistance, making it difficult for the intake flow to be a continuous flow, and reducing the filling efficiency of intake air into the subsequent working chamber. There is a problem in that it is not possible to expect much improvement.

Therefore, in order to solve the above problem, in addition to the first and second configurations described above, the trailing side inner wall surface 12a of the intake passage 12 formed in the rotor housing 2 is made to have a third configuration. , since the intake air flows along the trailing side inner wall surface 12a, the intake air to the subsequent working chamber @f
L becomes smooth and the intake air flow becomes a continuous flow, and together with the inertial supercharging, the intake air filling efficiency can be sufficiently improved, which is an excellent effect.

As is clear from the above description, the present invention has the following features.

In addition to the position of the starting line of the peripheral intake boat and the position of the trailing side end of the rotary recess, the shape of the trailing side inner wall surface of the intake passage is specified.
The intake air becomes a continuous intake air flow, and in combination with inertial supercharging, the intake air filling efficiency is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a sectional view of an intake device of a rotary piston engine. 1...Lower piston engine, 2...
... Rotor housing, 3 ... Apex seal, 4 ... Rotor, 8 ... Peripheral intake port, 8a ... Start line, 8b ...・
・Terminal edge, 11... Rotary recess, 11a...
... Leading side starting end, 11b... Trailing side end, 12... Intake passage, 12a
...Inner wall surface on the trailing side.

Claims (1)

[Scope of Claims] 1. In a rotary piston engine equipped with a peripheral intake boat, the apex seal passes the starting line of the peripheral intake port and the rotor posture immediately before reaching the terminal edge of the peripheral intake boat. In. The rotary recess is located slightly on the trailing side from the starting end on the leading side, and the trailing side inner wall surface of the nine intake passage formed in the rotor housing that connects to the intake port is inclined so that the intake air flow is deflected in the trailing direction. An intake device for a low repeat piston engine, characterized in that the trailing side terminal end of the rotary recess in the rotor attitude is located on the trailing side from the short axis position of the loaf housing.