JPS5849693B2 - Rotary piston engine with oil consumption reduction structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary piston engine, and more particularly to a rotary piston engine equipped with an oil consumption reduction structure.

A polygonal rotor eccentrically rolls within a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, with its top portion sliding along the trochoidal inner circumferential surface, The rotor has a side seal extending along the periphery on its side surface and an annular oil seal concentric with the center of the rotor, and the rotor is a so-called side intake port type Wankel rotary rotor having a side intake port opening on the inner surface of the side housing. In a piston engine, the space between the side surface of the rotor and the inner surface of the side housing and enclosed between the side seal and the annular oil seal communicates with the intake port at the beginning and end of the intake stroke, so that the space is The engine is in a negative state during operation.

This negative pressure increases the pressure difference between the inside and outside of the annular oil seal, and this increased pressure difference increases the amount of oil flowing across the i-shaped oil seal from the inside to the outside, increasing oil consumption. This is a contributing factor.

Additionally, in the case of annular oil seals, gas pressure is generally introduced into the back of the seal ring, and the force of this gas pressure is applied to the sealing together with the spring force of the spring to maintain its close contact with the inner surface of the side housing. However, this gas pressure decreases due to the above-mentioned negative and positive effects, reducing the pushing force of the seal ring against the inner surface of the side housing, which also increases the amount of oil crossing the annular oil seal, and therefore reduces oil consumption. This is the cause of the increase.

In view of the above problems in Wankel type rotary piston engines of the side intake port type, the present invention aims to provide an improved rotary piston engine that reduces oil consumption by reducing the negative pressure. The purpose is

According to the present invention, the polygonal rotor is housed in a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, and the polygonal rotor has its top portion aligned along the trochoidal inner circumferential surface. The rotor has a side seal extending along its periphery on its side surface and an annular oil seal concentrically centered on the rotor, and the rotor has an annular oil seal that opens on the inner surface of the side housing and is crossed by the side seal. In a Wankel type rotary piston engine with a side intake port,
A hole is opened in the inner surface of the side housing in a region surrounded by an envelope inside the sliding trajectory of the side seal and an envelope outside the sliding trajectory of the annular oil seal, and the hole is opened in a region surrounded by an envelope inside the sliding trajectory of the side seal and an envelope outside the sliding trajectory of the annular oil seal. This is achieved by a rotary piston engine characterized in that it is connected to an auxiliary intake system independent of the intake system and is supplied with air from this.

As mentioned above, the hole opened in the area surrounded by the inner envelope of the sliding trajectory of the side seal and the outer envelope of the sliding trajectory of the annular oil seal is communicated with the auxiliary intake system independent of the main intake system of the engine. By supplying air from this, when the space surrounded by the above-mentioned side seal and the annular oil seal is brought into negative pressure by communicating with the side intake port, the above-mentioned Air is quickly supplied from the auxiliary intake system through the holes, and the negative pressure generation is reduced or avoided.

Thus, according to the present invention, the space is prevented from becoming substantially negative pressure, and the increase in oil consumption due to the negative pressure in the space as described above is avoided.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 is a diagram schematically showing the side structure of a side port type Wankel type rotary piston engine.

In the figure, 1 is a rotor housing having a trochoidal inner circumferential surface 2, and a polygonal rotor 4 is located at the top of the casing, which is composed of the rotor housing and side housings 3 that close both ends of the rotor housing. The provided avex seals 5a, 5b, 5c are provided so as to eccentrically roll around the eccentric shaft 6 while sliding along the trochoidal inner circumferential surface 2.

The rotor 4 has corner seals 7 a , 7 b t 7 c on both side surfaces close to each apex, and a side seal 8 extending along the rotor periphery between these corner seals.
a, 8b, and 8c, and an annular oil seal 9 concentric with the rotor center is provided inside the rotor.

At least one of the side housings 3 is provided with a side intake port 10 that opens on the inner surface thereof.

Reference numeral 11 is a peripheral exhaust port provided in the rotor housing 1 and opening in a part of the trochoidal inner peripheral surface thereof, and 12a and 12b are spark plugs similarly attached to the rotor housing 1.

13a and 13b are holes provided to open into the inner surface of the side housing according to the present invention, and these holes are arranged within specific regions 14a and 14b.

The regions 14a and 14b are both regions surrounded by the inner envelope of the sliding locus of the side seals 8a to 8c and the outer envelope of the sliding locus of the annular oil seal 9 during eccentric rotation of the rotor, and their contours and positions are is better shown in FIG.

In FIG. 2, the curve made up of two arcuate curves 15a and 15b is the inner envelope of the sliding trajectory of the side seals 8a to 8c, and the circular curve 15c is the outer envelope of the sliding trajectory of the annular oil seal 9. It is a line.

Therefore, a region 14a surrounded between the side seal sliding locus inner envelope and the annular oil seal sliding locus outer envelope
and 14b are located in a space between the inner surface of the side housing 3 and the side surface of the rotor 4 and surrounded between the side seals 8a to 8c and the annular oil seal 9 at any position of the eccentric rotation of the rotor 4. Holes 13a and 13b, which face each other and open into this area, are always open to the space.

Figures 3 and 4 are lines ``1'' and ``IV'' in Figure 1, respectively.
It is a figure which schematically shows the cross-sectional structure by -IV.

As better shown in FIG. 4, the side seal 8a
When the oil crosses the side intake port 10, the space 15 enclosed between the side seal 8a and the annular oil seal 9 communicates with the combustion chamber A during the intake stroke through the port, and its negative pressure exerts a suction effect. Receiver, air cleaner 16, carburetor 17
, together with the intake air drawn in through the intake manifold 18, the gas in the space 15 is also drawn into the combustion chamber A.

However, at this time, the auxiliary air cleaner 19,
Since the air led through the auxiliary intake manifold 20 and the passage 21 is introduced through the holes 13a, the generation of a substantial vacuum in the space 15 is avoided.

Thus, if the space 15 becomes negative, the negative pressure reduces oil consumption by an amount corresponding to the amount of oil leaking across the annular oil seal 9 from its inner space 22 into the space 15; Since the gas flow acting on the back surface of the annular oil seal 9 is maintained at a correspondingly high level, the annular oil seal is more securely attached to the inner surface of the side seal 3 (in this case, due to the presence of an oil film on the front surface of the annular oil seal 9, Due to such improved sealing of the annular oil seal, the amount of oil leaking across the annular oil seal is further reduced by that amount.

From the above, it will be understood that according to the present invention, a rotary piston engine that can achieve a reduction in oil consumption compared to conventional structures can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the side structure of a low-return piston engine according to the present invention. FIG. 2 is a diagram showing an envelope within the sliding trajectory of the side seal and an envelope outside the sliding trajectory of the annular oil seal in the rotary piston engine shown in FIG. Figures 3 and 4 are lines ``1'' and ``IV'' in Figure 1, respectively.
-Fig. 1...Roke housing, 2...Trochoidal inner peripheral surface, 3...Side housing, 4
......Rotor, 5a-5c...Avex seal, 6...Eccentric shaft, 7a-7c...
... Corner seal, 8a-8c ... Side seal, 9 ... Annular oil seal, 10 ...
・Side intake port, 11... Peripheral exhaust port, 12a, 12b... Spark plug, 13a
> 13b...hole, Ha7i4b...
Area, 15... Space, 16... Air cleaner, 17... Carburetor, 18... Intake manifold, 19... Auxiliary air cleaner, 2
0... Auxiliary intake manifold, 21...
Passage, 22... Space inside the annular oil seal.

Claims (1)

[Claims] 1. A polygonal rotor is eccentrically rolled in a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor, while sliding its top portion along the trochoidal inner circumferential surface; The rotor has a side seal extending along the periphery of the rotor, an annular oil seal concentric with the center of the rotor, and a Wankel type rotary piston having a side intake port that opens on the inner surface of the side housing and is crossed by the side seal. In the engine, a hole is opened in the inner surface of the side housing in a region surrounded by an envelope within the sliding trajectory of the side seal and an envelope outside the sliding trajectory of the annular oil seal; A rotary piston engine 0 characterized in that the hole is connected to an auxiliary intake system independent of the main intake system of the engine, and air is supplied from this.