JPS581630Y2 - Rotary piston engine rotor cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a rotor cooling device for a rotary piston engine.

In general, the rotor of a rotary piston engine is divided into a combustion chamber part that forms part of the combustion chamber, and a seal mounting part where the apex seal, corner seal, side seal button, and oil seal are mounted, and the former is the combustion chamber. Of course, it is desirable to keep the temperature of the latter part at an appropriate level in order to promote fuel atomization, etc. On the other hand, it is desirable to keep the latter part, that is, the seal mounting part, as cool as possible from the viewpoint of seal durability. There are conflicting demands between them.

Conventionally, in order to deal with the above conflicting demands, it has been proposed to surround the inside of the combustion chamber of the rotor with a suitable partition wall to prevent oil from entering the combustion chamber and promote atomization of the fuel. It has been proposed that

That is, in this proposed device, a plurality of partition walls are arranged between a boss and an outer wall consisting of a side wall and a peripheral wall that constitute the rotor of a U-Tary piston engine, and a cooling chamber is provided at the back of the top side of the rotor. At the same time, a sealed chamber is formed at the back of the rotary recess, and cooling passages opening radially inward are formed between the side walls on both sides of the sealed chamber in the axial direction and the side walls of the outer wall. The oil sent to the cooling chamber through the cooling passage is guided to a discharge hole provided in the side housing through the cooling passage.

However, in the above-mentioned proposed device, one oil supply nozzle provided on the eccentric shaft is opened toward the cooling passage and the cooling chamber located on one side of the sealed chamber. While the seal mounting area on one side is sufficiently cooled, the oil whose temperature has risen through the cooling chamber is introduced into the seal mounting area on the other side, resulting in insufficient cooling of the seal mounting area on the other side. was there.

The present invention has been developed in view of these points, and while maintaining heat insulation of the combustion chamber of the rotor, oil is supplied separately and forcibly to the seal mounting portions of both cylinders of the rotor, so that both seals can be sealed. The present invention provides a rotor cooling device for a rotary piston engine that can sufficiently cool both the mounting parts. Place the
A cooling chamber is formed at the back of the top portion, a sealed chamber is formed at the back of the rotary recess, and the cooling chamber is opened radially inward between the side walls on both axial sides of the sealed chamber and the side wall of the outer wall. In a rotary piston engine equipped with a rotor having respective passages, oil supply nozzles are provided on both sides of the eccentric portion of the eccentric shaft, and the oil supply nozzles are alternately connected to the cooling passages as the eccentric shaft rotates. The cooling passage bag is opened to face the cooling chamber, and oil is supplied to the cooling passage bag and the cooling chamber, respectively.

In this case, preferably, the oil passages communicating with the two oil supply nozzles are buttoned and gathered on the upstream side thereof, and a control valve for controlling the oil supply timing is provided in the gathering part, so that one control valve is formed. This makes it possible to control the timing of oil supply from the two oil supply nozzles, thereby simplifying the structure.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Referring to the first fixation and FIG. 2, 1 is a casing composed of a rotor housing 2 having a trochoidal inner periphery and side housings 3, 3 disposed on both sides of the rotor housing 2 and fixed integrally; is a polygonal rotor that rotates planetarily within the casing 1, and the rotation of the rotor 4 sequentially performs the suction, compression, explosion, expansion button, and discharge strokes of the working gas.

Reference numeral 5 denotes an eccentric shaft having an eccentric core portion 5a fitted into the rotor 4, and the rotor 4 is rotated by the planetary rotation motion of the rotor 4 through meshing between an external gear 6 and an internal gear T provided on the rotor 4. It rotates at a faster rotational speed.

The rotor 4 has a top portion 8 and a circular arc center portion 9, and a rotary recess 10 constituting a part of the combustion chamber is recessed in the circular arc center portion 9. 11,
11 and a peripheral wall portion 12, and a boss 14, and a plurality of partition walls 15, 15°, . . . are arranged between the outer wall 13 and the boss 14. A cooling chamber 16 is formed at the back of the rotary recess 10, and a sealed chamber 17 is formed at the back of the rotary recess 10, and side walls 18, 18 on both sides in the axial direction of the sealed chamber 17 and side wall portions 11, 11 of the outer wall 13 are formed. There are cooling passages 19, 19 which open radially inward and communicate with the cooling chamber 16.
are formed respectively.

On the other hand, openings are provided on both sides of the eccentric portion 5a of the eccentric shaft 5 to the cooling passages 19, 11- and the cooling chamber 16 located on both sides of the sealed chamber 170 so as to alternately face each other as the eccentric shaft 50 rotates. An oil supply nozzle 20.20 is provided;
Each of the oil supply nozzles 20.20 communicates with an oil passage 21.21 provided in the axial direction in the eccentric part 5a, and both oil passages 21.21 are gathered together at the central part of the eccentric part 5a, Collection oil passage 2 provided in the radial direction in 5a
2, and communicates with an oil supply passage 23 provided in the eccentric shaft 5.

A control valve 24 for controlling oil supply timing is provided at the gathering portion of both the oil passages 21 and 210, and the control valve 24j
d The valve seat 24a is provided with a ball 24b disposed in a seating position and a spring 24c that biases the ball 24b in the seating direction.When the pressure of oil supplied from the oil supply passage 23 is below a set value, the spring 24c The urging force of the spring 24c causes the ball 24b to sit on the valve seat 24a and close the oil passage 21°21, while the ball 24b is seated on the valve seat 24a against the urging force of the spring 24c when the oil pressure exceeds the set value. The oil passage 21.21 is opened by moving the oil passage 21.21 away from the oil passage 21.21.

In addition, 25 indicates the eccentric portion 5a of the eccentric shaft 5 and the boss 14 of the rotor 4.
26 is a two-part apex seal mounted on the top of the peripheral wall 12 that extends radially outward of the cooling chamber 16 and is attached to the top 8 of the rotor 4;
γ is a corner seal attached to the edge of the side wall 11 which is buttoned on the axially outer side of the cooling chamber 16 and which is buttoned on the top side 8 of the rotor 4;
28 is a side seal attached to the side wall portion 11 of the rotor 4 by pressing a button on the axially outer side of the cooling passage 19; 29 is a side seal that is attached to the axially outer side of the cooling passage 19 or the cooling passage 19 and the cooling chamber 16 and is attached to the side wall of the rotor 4; With the oil seal attached to part 11,
Each has a rubber auxiliary seal.

30 to 33 are springs that urge each of the seals 26 to 29 from the back side; 34 is a branch oil supply passage branched from the oil supply passage 23 to supply oil to the bearing 25; and 35 is a branch oil supply passage to the side housing 3. This is an oil discharge passage provided.

Therefore, in the above embodiment, the oil supply passage 2
The oil supplied from 3 passes through the collective oil passage 22 and each oil passage 21.21 to each oil supply nozzle 2.
0.20.

At this time, since the eccentric shaft 5 rotates at a faster speed than the rotor 4, the oil supply nozzles 20 and 20 attached to the eccentric shaft 5 are connected to the cooling passages 19 and 19 buttons as the eccentric shaft 50 rotates. Now facing the cooling chamber 16,
The oil is fed from the nozzles 20, 20 toward the cooling passages 19, 19 and the cooling chamber 16 located on both sides of the sealed chamber 1T, and as shown by the arrows in FIG. After cooling each seal mounting portion from the inside by flowing the oil, each cooling passage 19 is also discharged to the oil discharge passage 35.

In this case, the sealed chamber 17 at the back of the rotary recess 10 is sealed with respect to the cooling passage 19 and the cooling chamber 16 by the side wall 18 and the partition wall 15.
7 and the rotary recess 10 is not cooled due to the heat insulation effect of the sealed chamber 17, so that the rotary recess 10 can be kept at a relatively high temperature.

Furthermore, the supply timing of oil to each of the oil supply nozzles 20, 20 is controlled by one control valve 24, and only when the oil pressure from the oil supply passage 23 is above a set value (during high rotation). The control valve 24 is opened to supply oil and cool the rotor 4 (especially the parts where each seal is attached) appropriately, while the control valve 24 is closed when the oil pressure is below the set value (during low rotation). Oil supply is stopped, and overcooling of the rotor 4 can be prevented.

As explained above, according to the present invention, a plurality of partition walls are arranged between the outer wall consisting of the side wall part and the peripheral wall part and the boss,
A cooling chamber is formed at the back of the top portion, a sealed chamber is formed at the back of the rotary recess, and the cooling chamber is opened radially inward between the side walls on both axial sides of the sealed chamber and the side wall of the outer wall. In a rotary piston engine equipped with a rotor in which passages are formed, oil supply nozzles are provided on both sides of the eccentric portion of the eccentric shaft, and the oil supply nozzles are alternately connected to the cooling passages as the eccentric shaft rotates. By having an opening facing the button and the cooling chamber, and supplying oil to the cooling passage and the cooling chamber, respectively,
The seals on both sides of the rotor do not interfere with the high temperature maintenance of the combustion chamber (rotary recess) of the rotor due to the heat insulation effect of the sealed chamber, regardless of the rotational position of the oil supply nozzle on the eccentric shaft relative to the rotor. Since the mounting part can be forcibly and sufficiently cooled by oil from individual oil supply nozzles, the rotor can be cooled effectively, which in turn improves the durability of each seal and vaporizes the working gas. This promotes atomization and maintains engine performance in an optimal state over a long period of time.

In addition, if the oil passages that communicate with the two oil supply nozzles are assembled on the upstream side thereof, and a control valve that controls the oil supply timing is provided in the collection part, one control valve can handle two oils. Since the timing of oil supply to the supply nozzle can be controlled, this has the advantage that the structure can be simplified.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 shows the main parts of a rotary piston engine equipped with a rotor cooling device according to the present invention, and is a longitudinal sectional front view taken along line C-C in FIG. , Figure 2 shows the cross section taken along line A-A in Figure 1 in the left half;
It is a sectional view showing a cross section taken along line BB in the figure on the right side. 1...Casing, 2...Rotor housing, 3.
... Side housing, 4... Rotor, 5... Eccentric shaft, 5a... Eccentric part, 6... External gear, 7... Internal gear, 8... Top part, 9・・・Central part of the arc, 10・
...Rotary recess 11...Side wall part, 12...Peripheral wall part,
13...Outer wall, 14...Boss, 15...Partition wall, 1
6... Cooling chamber, 17... Sealed chamber, 18...-ffl
Q wall, 19... Cooling passage, 20... Oil supply nozzle, 21... Oil passage, 22... Collection oil passage, 23... Oil supply passage, 24... Control valve, 24
a... Valve seat, 24b... Ball 24c... Spring, 25... Bearing, 26... Apex seal, 27... Corner seal, 28... Side seal, 29... Oil Seal, 30-33... Spring, 34... Branch oil supply passage, 35... Oil discharge passage.

Claims (2)

[Scope of utility model registration request] (1) A plurality of partition walls are arranged between the outer wall consisting of the side wall and the peripheral wall and the boss to form a cooling chamber at the back of the top part and a sealed chamber at the back of the rotary recess, and furthermore, the above-mentioned A rotary piston engine equipped with a rotor having cooling passages opening radially inward between side walls on both axial sides of a sealed chamber and a side wall portion of an outer wall,
Oil supply nozzles are provided on both sides of the eccentric portion of the eccentric shaft, and the oil supply nozzles are alternately opened to face the treasury passage button and the cooling chamber as the eccentric shaft rotates,
A rotor cooling device for a rotary piston engine, characterized in that it is configured to supply oil to a cooling passage button and a cooling chamber, respectively. (2) A utility model registration claim characterized in that oil passages communicating with two oil supply nozzles are assembled by buttoning on the upstream side thereof, and a control valve for controlling oil supply timing is provided in the assembly part. A rotor cooling device for a rotary piston engine according to scope (1).