JPS5924825Y2 - Rotary piston engine rotor cooling system - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotor cooling device, particularly a rotor cooling device that actively cools the area around oil seal devices installed on both sides of the rotor.

Normally, in a rotary piston engine, an oil seal device is installed on both sides of the rotor, and this oil seal device uses the heat transferred from the combustion chamber to cause the rubber O-ring attached to the oil seal to There is a problem that the sealing performance deteriorates due to thermal deterioration of the oil seal ring or thermal deformation of the lip portion of the oil seal ring.

For this reason, cooling around the oil seal device has been a concern for some time.

Therefore, conventionally, it has been proposed to form a cooling chamber at the back of the oil seal device on both sides of the rotor, and supply oil to the cooling chamber to actively cool the area around the oil seal device. In this conventional device, the structure was extremely complicated when forming the cooling chamber, resulting in high cost.

(For example, Utility Model Application Publication No. 13404/1983,
In other words, in the conventional cooling chamber, a rotor gear is fitted on the rotor gear side into the open end of an annular groove that is open radially inward, and an annular press-fit ring is press-fitted on the side opposite to the rotor gear. The rotor gear and the press-fit ring covered the open end of each annular groove to form a cooling chamber with a closed cross section.

Therefore, since the rotor gear unique to rotary piston engines is used on the rotor gear side, the annular groove can be covered and a cooling chamber can be formed by installing the rotor gear, and the work is not complicated, but on the opposite rotor gear side, A completely new task was added: press-fitting the press-fit ring, and it was also necessary to form a vent in the press-fit ring to drain the cooled oil, which not only made the work difficult but also complicated the structure. .

The present invention has been made with attention to this point, and at least the cooling chamber on the side opposite to the rotor gear is formed by compressing an outer elastic ring having an abutment into the opening of the annular groove, and The aim is to eliminate the drawbacks of conventional ones by removing the abutment.

Next, embodiments of the present invention will be described along with the drawings.

In FIG. 1, 1 is a casing composed of a rotor housing 2 and a side housing 3, and 4 is a rotor supported by an eccentric shaft 5 within the casing 1 to perform planetary rotation.

The rotor 4 has a peripheral wall 4a and a side wall 4 as a rotor flank.
b, 4C, a rotor boss 4d, and a rotor rib 4e.

A rotor gear 6 is fitted into a stepped portion formed on one side of the rotor 4, that is, one side wall 4b, and is firmly attached to the rotor boss 4d with fixing means such as a spring pin.

7 is an oil passage provided in the eccentric shaft 5; 8 is a jet passage formed in the eccentric shaft 5; one end communicates with the oil passage 7;
The other end opens toward a hollow portion 4g having a cooling surface 4f of the rotor flank back portion, that is, the peripheral wall 4a, formed inside the rotor 4.

A control valve 9 is interposed in the jet passage 8 and opens when the oil flowing through the oil passage 7 exceeds a set pressure, that is, when the engine speed exceeds a set value. The rotor temperature is controlled by supplying oil to the hollow portion 4g through an opening 4h serving as a discharge port.

10a and 10b are oil seal devices provided on the rotor side portions, that is, rotor side walls 4b and 4C, and 11a and 11b are annular cooling chambers provided on the backs of the oil seal devices 10a and 10b.

Of the cooling chambers 11a and 11b, the cooling chamber 11a on the rotor gear side has an annular groove 1 open on the inside in the radial direction.
2a and a rotor gear 6 that covers the opening of the annular groove 12a, and the rotor gear 6 has a cooling chamber 11a.
A discharge hole 13a is formed as a discharge port for discharging the cooled oil inside.

In addition, the cooling chamber 11 b on the side opposite to the rotor gear has an annular groove 12
b, and an outer elastic ring 14 that is compressed into the opening of the annular groove 12b and covers the opening.

This elastic ring 14 is made of wire and has an abutment 15.
The abutment 15 is configured to be used as a discharge port 13b for discharging cooled oil in the cooling chamber 11b.

In this case, the elastic ring 14 may be formed of a plate material other than a wire rod, or if the surface of the elastic ring is coated with a soft material such as rubber or synthetic resin, the elastic ring 14 and the annular groove 1
It is more preferable because it can improve the airtightness between the opening and the opening of b.

Furthermore, the elastic ring 14 may be curved at multiple locations in the circumferential direction to form a non-contact portion between it and the opening of the annular groove, and the oil may be discharged from this non-contact portion in addition to the abutment. .

16a and 16b are the respective cooling chambers 11a and 11b
The oil supply passages 16 a and 16 b communicate with a branch passage 7 a branched from the oil passage 7 via an oil hole 17 provided in the bearing.

Note that 18 is an oil drain chamber, and 19 is an oil recovery passage formed in the side housing 3.

With the above structure, the oil supply passage 1
The oil supplied to 6a and 16b is supplied to each cooling chamber 11.
a, 11b, each oil seal device 10
a, 10b, and each cooling chamber 11a.

The cooled oil in 11b is discharged into the oil drain chamber 18 from the discharge hole 13a on the rotor gear side, and is discharged into the oil drain chamber 18 from the abutment 15 of the elastic ring 14, that is, the discharge port 13b on the side opposite to the rotor gear. These oils are collected into an oil pan (not shown) through collection passages 19 formed in each side housing 3, respectively.

At this time, when the engine speed is low and the control valve 9 is closed, no oil flows into the hollow portion 4g, but since oil is constantly supplied to each cooling chamber 11a, 11b, the oil seal device The rotor temperature can be maintained at a relatively high temperature without adversely affecting the surroundings.

In addition, when the engine speed is high and the control valve 9 opens, the hollow part 4
A preset amount of oil is supplied into g, and the rotor temperature is maintained at the set value.

The oil supplied to the hollow part 4g flows through the opening 4h to the oil drain chamber 1.
8 and is collected into the oil pan via the collection passage 19 in the side housing 3.

Therefore, the present invention forms the cooling chamber at least on the side opposite to the rotor gear by fitting an outer elastic ring having a cut in the opening of the annular groove, and using the abutment of the elastic ring as the outlet of the cooling chamber. Therefore, it is extremely easy to form a cooling chamber and a discharge port for discharging cooled oil from the cooling chamber, and the drawbacks of the conventional ones can be completely eliminated.

[Brief explanation of the drawing]

FIG. 1 is a vertically sectioned front view of a rotary piston engine according to this invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a side view taken along line III--III of FIG. 2. 4... Rotor, 6... Rotor gear, 1
0 a, 10 b...Oil seal device, l
la, llb...cooling room, 12 a12b...
...Annular groove, 14...Elastic ring, 15.
...Aiguchi.

Claims (1)

[Scope of utility model registration request] In a rotary piston engine that cools the oil seal device by supplying oil to annular cooling chambers formed at the back of the oil seal device on both sides of the rotor, at least one of the cooling chambers on the side opposite to the rotor gear is provided. , consists of an annular groove that is open radially inward and an outer elastic ring that is fitted into the opening of the annular groove and has an abutment that covers the opening, and allows the cooled oil in the cooling chamber to flow into the cooling chamber. A rotor cooling device for a rotary piston engine, characterized in that the air is discharged from an abutment of an elastic ring.