JPS5849695B2 - 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 is a so-called side intake port type Wankel type rotary rotor having a side intake port opening on the inner surface of the side housing. 'In a stone engine, the space between the side surface of the rotor and the inner surface of the side housing and surrounded 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 in a negative or positive state while the engine is operating.

Such negative and positive forces increase the pressure difference between the inside and outside of the annular oil seal, and this increase in pressure difference increases the amount of oil flowing across the annular oil seal from the inside to the outside, increasing oil consumption. This is the cause.

In addition, in the case of annular oil seals, a gas ball is generally introduced into the back of the seal ring, and the force of this gas pressure is applied to the seal ring along with the spring force of a spring to maintain its close contact with the inner surface of the side housing. However, this gas pressure decreases due to the negative pressure effect described above, reducing the pressing 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 increases oil consumption. This is the cause of an increase in

In view of the above-mentioned problems in the Wankel type rotary piston engine of the side intake port type, the present invention provides an improved rotary piston engine that reduces oil consumption by reducing the negative pressure. It is an object.

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 and an annular oil seal concentric with the center of the rotor, which opens into the inner surface of the side housing and is crossed by the side seal. In a Wankel type rotary piston engine with side intake ports,
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, and the hole is opened to allow engine oil to flow through the area. This is accomplished by a rotary piston engine, which communicates with the interior of the pan and is supplied with air or air containing lean fuel vapor.

As mentioned above, the hole that opens 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 internal space of the engine's oil pan, and the hole is connected to the inner space of the engine oil pan. By supplying air containing fuel vapor, the space enclosed between the side seal and the annular oil seal is brought into negative pressure by communicating with the side intake port. Air or air containing dilute fuel vapor is quickly supplied from the oil pan interior space through the hole, and the generation of negative pressure is reduced or avoided.

Thus, according to the present invention, the space is prevented from being under a 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 7a, 7b, 7c on both side surfaces close to each vertex, and side seals 8a, 8b, 8 extending along the rotor periphery between these corner seals.
c, and furthermore, 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.

11 is a peripheral exhaust port provided in the rotor housing 1 and opens in a part of the trochoidal inner circumferential 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 ■-■ and IV of 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 causes a suction effect. , air cleaner 16, carburetor 1
7. Along with the intake air sucked through the intake manifold 18,
Gas within the space 15 is also drawn toward the combustion chamber A.

However, at this time, air or gas introduced from the oil pan internal space (not shown in the figure) through the passage 16 is introduced into the space 15 through the hole 13a, so there is a substantial load inside the space 15. This will be avoided.

Thus, if there is a negative pressure in the space 15, 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 17 into the space 15; Since the gas balls acting on the back surface of the annular oil seal 9 are also kept high, 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 inside 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 ■-■ and IV of Figure 1, respectively.
FIG. 2 is a schematic diagram of a cross section according to -IV. 1... Rotor 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, 1 2 a t 1 2 b"・Spark plug, 1
3a-13b...hole, 14a, 14b...
... Area, 15 ... Space, 16 ... Passage, 17 ... Annular oil seal inner space.

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 housing, with its top portion sliding 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; 1. A rotary piston engine, wherein the hole communicates with an internal space of an oil pan of the engine, and air or air containing diluted fuel vapor is supplied from the hole.