JPS6220601A - Lubricating device for rotary piston engine - Google Patents

Abstract

PURPOSE:To ensure excellent lubricating properties, by a method wherein, during colddown, the oil pressure of an eccentric shaft is decreased by a hydraulic regulating valve, and a warming-up time is shortened through decrease of an amount of oil for cooling, meanwhile, during high rotation running during colddown, an oil pressure is increased through closing of a relief passage. CONSTITUTION:Oil is fed with a pressure to an oil passage 13 in an eccentric rod 6 supporting a rotor, and is further fed to a main bearing part supporting the eccentric shaft 6. In which case, a temperature-sensitive type hydraulic regulating valve 17 is mounted in an oil passage 13 at the one end of the eccentric shaft 6. The hydraulic regulating value increases the energizing force of a spring 17b with the increase in an oil temperature, and an oil pressure in the oil passage 13 is increased through increase of the opening actuating pressure of a valve body 17a. A valve member 19, opened and closed depending upon the number of revolutions of the eccentric shaft 6, is located in a relief passage 18 opened and closed by the hydraulic regulating valve 17, and outward movement of a valve body 19a to the outside by means of an centrifugal force produced occasioned by an increase in rotation of the eccentric shaft 6 results in closing of a valve seat 19c.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a lubrication device for a rotary piston engine.

(Prior art) Generally, in a rotary piston engine, oil discharged from an oil pump is pumped into an oil passage of an eccentric shaft, and oil is supplied from the oil passage to the main bearing and rotor bearing for lubrication. ing. Further, the oil pressure-fed to the oil passage of the eccentric shaft is supplied to the inside of the rotor by an increase in oil pressure and centrifugal force, thereby cooling the rotor.

For example, as seen in Japanese Patent Publication No. 55-48162, a temperature-sensitive oil pressure regulating valve is provided in the oil passage of the eccentric shaft to relieve the oil in the eccentric shaft oil passage when the oil temperature is low. A known technique is to stop the supply of oil to the rotor. The above structure is
When cooling the rotor by supplying oil to the rotor, the rotor is cooled by the oil, even though it is desired to quickly increase the rotor humidity and shorten the warm-up time during warm-up after engine startup. Since the warm-up time becomes longer, the oil supply to the rotor is stopped.

In other words, the oil pressure-fed into the oil passage of the eccentric shaft is supplied to the main bearing section and rotor bearing section on the outer periphery of this eccentric shaft to perform mWI of these parts, and as described above, the oil is Sometimes, if the oil in the oil passage is relieved, when the engine speed increases to a high speed, there will be a shortage of oil supplied to the main bearing and rotor bearing, resulting in poor lubrication. This may cause an increase in frictional resistance, seizure, etc.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention provides a lubricating device for a rotary piston engine that supplies oil to the main bearing section and rotor bearing section during cold high rotation to ensure lubricity. The purpose is to

(Structure of the Invention) The lubricating device of the present invention is provided with a temperature-sensitive oil pressure regulating valve that increases the oil pressure in accordance with a rise in oil temperature in the oil passage of the eccentric shaft, and an eccentric oil pressure regulating valve in the oil relief passage of the oil pressure regulating valve. The invention is characterized in that a valve member is provided that closes the relief passage when the shaft rotates beyond a predetermined value.

(Effects of the Invention) According to the present invention, when the oil temperature is low, the oil pressure of the eccentric shaft is lowered by the temperature-sensitive oil pressure regulating valve, and the amount of cooling oil supplied to the rotor is reduced, thereby increasing the warm-up time. While trying to shorten the
In this high rotational state when cold, a valve member that operates according to the rotational speed of the eccentric shaft closes the relief passage of the oil pressure regulating valve to increase the oil pressure. It is possible to ensure lubricity by sufficiently supplying oil to the parts, and to prevent an increase in frictional resistance and occurrence of seizure.

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is an overall cross-sectional view of a two-cylinder rotary piston engine.
This casing 4 is provided with a casing 4 composed of
Each rotor 5 is supported on an eccentric shaft 6 for planetary rotation. The eccentric shaft 6 is connected to the casing 4
The rotor 5 is supported by main bearing portions 7.8 at the front and rear ends thereof, and the rotor 5 is supported via a rotor bearing portion 9.

Oil supply passages 11 and 12 are formed in the front and rear side housings 3, 3, through which oil discharged from an oil pump (not shown) is fed under pressure, and these oil supply passages ii, 1
2 communicates with an oil passage 13 formed at the center of the eccentric shaft 6 through oil holes 11a and 12a opened in the main bearing parts 7 and 8. This oil passage 13
supplies oil to the rotor bearing part 9 through the communication hole 13a provided in the radial direction,
3 and the cooling chamber 5a of the rotor 5 are connected to the oil return passage 14.
A branch path 13b is provided which communicates through the branch path 13b.
1) includes a control jet 15 consisting of a one-way ball valve that opens the branch passage 13b to supply oil to the cooling chamber 5a when the rotational speed of the eccentric shaft 6 reaches a predetermined value.
is provided.

As shown in FIG. 2, one end of the eccentric shaft 6 is equipped with a temperature-sensitive oil pressure regulating valve 17 in its oil passage 13. A valve body 17a is provided to open and close the passage 13, and the biasing force of a spring 17b that biases the valve body 17a is variably adjusted by a thermopellet 17C. The opening operation pressure of the body 17a is increased to increase the oil pressure in the oil passage 13. This increase in oil pressure in the oil passage 13 increases the amount of oil supplied to the main bearing parts 7, 8, rotor bearing part 9, and cooling chamber 5a inside the rotor 5, and when the temperature is low, the oil supply m is reduced to improve warm-up. It is intended to improve

Furthermore, a valve member 19 that operates Itflrs1 according to the rotation speed of the eccentric shaft 6 is interposed in the relief passage 18 provided by the oil pressure regulating valve 17 . This valve member 19 has a ball-shaped valve body 19a biased toward the center by a spring 19b, and a valve seat 19C disposed on the outside. It is configured to close the relief passage 18 by moving and closing the valve seat 19G. Due to the blockage of the relief passage 18, oil relief is stopped and the oil pressure increases,
This increases the amount of oil supplied to the main bearing section 7.8, rotor bearing section 9, etc.

The oil pressure regulating valve 17 is attached to the tip of the lock bolt 20 and inserted from one end of the oil passage 13. Further, in FIG. 2, 21 is a sleeve forming a relief passage, and 22 is a gear for driving the distributor.

According to the above configuration, when the oil temperature in the oil passage 13 of the eccentric shaft 6 is low, the oil pressure adjustment valve 17 releases oil.

This reduces the oil pressure and reduces the cooling oil supply layer, shortening the warm-up time. On the other hand, during cold high rotation, the relief passage 18 is closed by the valve member 19,
The oil pressure in the relief state is increased and the bearing parts 7 to 9 are
This prevents burn-in.

FIG. 3 shows a modification in which the relief passage 18 of the oil pressure regulating valve 17 is formed in the boss portion of the gear 23 for driving an auxiliary device such as an oil pump, and the other features are formed in the same manner as in the previous example.

The valve member 19 provided in the relief passage 18 may be a ball valve that utilizes centrifugal force as in the embodiment, or may have a function of detecting the rotational speed of the eccentric shaft, that is, the engine rotational speed, and closing the relief passage 18. A known valve member having the following can be appropriately employed as needed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a rotary piston engine according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the section ■ in FIG. 1, and FIG. 3 is a cross-sectional view showing a modification. 1...Rotary piston engine 2...
・Rotor housing 3...Side housing 4...Casing 5...Rotor 5a...Cooling chamber 6...Eccentric shaft 7.8. ...Main bearing part 9...
...Rotor bearing part 11.12...Oil supply passage 13...
・Oil passage 13b... Branch road 17...
...Hydraulic pressure adjustment valve 18...Relief passage 19...Valve member Fig. 2

Claims (1)

[Claims] (1) In a rotary piston engine in which oil discharged from an oil pump is pumped to an oil passage in an eccentric shaft, and oil is supplied from the oil passage to a main bearing part and a rotor bearing part, the oil in the eccentric shaft is A temperature-sensitive oil pressure regulating valve that increases oil pressure in response to a rise in oil temperature is provided in the passage, and a valve member that closes the relief passage when the eccentric shaft rotates above a predetermined rotation is provided in the oil relief passage of the oil pressure regulating valve. A lubricating device for a rotary piston engine.