JPS63100227A - Construction of multicylinder rotary piston engine - Google Patents

Abstract

PURPOSE:To prevent oscillation of an eccentric shaft composed of a first eccentric shaft member, a second eccentric shaft member fitted on a portion of the outer surface of the first eccentric shaft and a plurality of rotors supported thereby by making the width of the rotor on the second eccentric shaft member smaller than that of the rotor on the first eccentric shaft member. CONSTITUTION:A first eccentric shaft member 1 extends through a multicylinder rotary engine body 1 and comprises a large diameter portion 17 and a small diameter portion 18 connected with each other through a tapered portion 25. The large diameter portion 17 is formed with eccentric portions 19 facing respective working chambers 10, 11 of cylinders, and rotors 20, 21 are supported by the eccentric portions 19, respectively. A second hollow eccentric shaft member 23 having a through hole 24 in which the small diameter portion 18 of the first eccentric shaft member 16 can be received along with the tapered portion 25 is fitted on the small diameter portion 18, and includes an eccentric portion 27 by which a rotor 28 is supported. In this case, the rotor 20 is formed smaller in width than the rotors 20, 21. This allows reduction of oscillation of the small diameter portion 18 having less rigidity, so that a stationary gear 35 and a cover 38 serving as bearing means can be prevented from seize and breakage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a multi-cylinder rotary piston engine having at least three or more cylinders.

(Prior art) In a Taly piston engine, when the number of cylinders increases to 3 or more, the number of eccentric parts also increases to 3 or more, and if 3 or more eccentric parts are formed on one eccentric shaft, assembly is difficult. There was a problem.

To solve this problem, an eccentric shaft is provided with a large diameter part having an eccentric part on the outer periphery, and a small diameter part smaller in diameter than the large diameter part, and between the small diameter part and the large diameter part. a first eccentric shaft having a tapered portion whose diameter increases as it extends from the small diameter portion toward the large diameter portion; an eccentric portion on the outer periphery; It is known to have a hollow second Ii core shaft which is press-fitted and formed separately (see, for example, Japanese Patent Application Laid-Open No. 60-69208).

However, in the above-mentioned conventional type, a clearance fit is used in consideration of serviceability when attaching and detaching the second eccentric shaft to and from the first s-center shaft, and the rotation of the eccentric shaft is Similarly, a small gap exists between the key for positioning the second eccentric shaft in the rotational direction of the first eccentric shaft and the keyway. These two minute gaps allow the second
The load that the eccentric shaft receives is transmitted through the second fB center shaft,
This is because the transmission is facilitated by the small diameter part of the first eccentric shaft with low rigidity, and the other is that the eccentric shaft has become longer and more easily deflected.
Due to two factors, the tip of the small diameter portion of the first eccentric shaft swings significantly in the high rotation range, and there is a risk that the bearing may seize and break.

(Object of the Invention) The present invention has been made in view of the above conventional problems, and provides a multi-cylinder rotary motor with excellent reliability and durability by reducing the swinging of the small diameter portion of the first eccentric shaft. The purpose is to provide piston engines.

(Structure of the Invention) In order to achieve the above object, the present invention includes a large diameter portion having an eccentric portion on the outer periphery, and a small diameter portion smaller in diameter than the large diameter portion, and the small diameter portion and the large diameter portion are connected to each other. a first eccentric shaft having a tapered portion whose diameter increases as it extends from the small diameter portion toward the large diameter portion; In a multi-cylinder rotary piston engine formed by holding a rotor in each eccentric part of an eccentric shaft consisting of a hollow second eccentric shaft that is press-fitted to the first second eccentric shaft, The width of the piece held in the eccentric part is
The width of the first eccentric shaft is smaller than the width of the shaft held by the eccentric portion of the first eccentric shaft.

(Effects of the Invention) The present invention focuses on the fact that rotary piston engines are superior in balance and low rate of pressure rise compared to reciprocating engines, and the present invention focuses on With a simple configuration in which the width, that is, the displacement is smaller than that of the rotor held on the eccentric part of the first eccentric shaft,
Swinging of the small diameter portion of the first eccentric shaft can be reduced, seizing and damage of the bearing can be prevented as much as possible, and displacement can be easily adjusted.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. The figure shows an overall view of a multi-cylinder rotary piston engine. In this figure, 1 is a multi-cylinder (3-cylinder) rotary piston engine main body, and this multi-cylinder rotary piston engine main body 1 has an end side housing 2. , 3 and intermediate side housing 4, 5 and rotor housing 6t7t
8, and the rotor housing 6, which is smaller in width than the rotor housings 7 and 8, is kept airtight by the end side housing 2 and the intermediate side housing 4.
The rotor housing 7 forms the working chamber 9 of the cylinder, and the rotor housing 7 is kept airtight by the intermediate side housings 4 and 5 to form the working chamber 10 of the second cylinder, and the rotor housing 8 is connected to the end side housing 3 and the intermediate side housing. 5, the working chamber 11 of the third cylinder is maintained airtight. Each housing 2 to 8 has a hollow positioning pin t2t.
13s14, and are fastened and connected by a tensile port 15.

The multi-cylinder rotary piston engine body 1 is provided with a first eccentric shaft 16 that passes through the multi-cylinder rotary piston engine body 1 from the end side housing 2 toward the end side housing 3. This first eccentric shaft 16
has a large diameter portion 17 extending in the axial direction and a small diameter portion 18 smaller in diameter than the large diameter portion 17, and an eccentric portion 19 is formed in the large diameter portion 17 at a portion facing the working chamber 11. An eccentric portion 19 is formed in a portion facing the working chamber 10, and each of the eccentric portions 19919 holds a rotor 20t21, and is supported by a bearing on the back surface of two fixed gears 36t37. Further, the small diameter portion 18 of the 111i-th core shaft 16 is provided with a second eccentric shaft 23 that is hollow and is supported on the back surface of the fixed gear 35 . The second eccentric shaft 23 has a through hole 24 extending in the axial direction thereof, and the small diameter portion 18 is configured to fit into the through hole 24. The first eccentric shaft 16 has a tapered portion 25 formed between the large diameter portion 17 and the small diameter portion 18, and the tapered portion 25 extends from the small diameter portion 18 toward the large diameter portion 17. The through hole 24 has a tapered hole 26 formed on the side closer to the large diameter portion 17, and this tapered hole 26
A tapered portion 25 is press-fitted into the tapered portion 25.
The tapered hole 26 functions as an axial positioning means for the eccentric portion 27 formed on the second eccentric shaft 23.

The eccentric part 27 is located in the working chamber 9 of the first cylinder, and the eccentric part 27 holds a plunger 28.

The positioning of the second eccentric shaft 23 relative to the first eccentric shaft 16 in the rotational direction is performed by a key (not shown).
The second eccentric shaft 23 is fixed to the end of the thrust plate 29.
is brought into contact with this thrust plate 29, and a balance weight 30. This is accomplished by transmitting the tightening force of the fixed port 34 through each of the sprockets 31 to 33.

Further, a cover member 38 whose one end is fixed to the end side housing 2 is provided on the outer circumference of the sprocket 33 to seal the seal 33.
9.

Furthermore, the width of the rotor 28 held by the eccentric portion 27 of the second eccentric shaft 23 is set to 60 m (10A type rotor...
...490cc), and the eccentric portion 1 of the first eccentric shaft 16
The width of the rotor 20+21 held by each of 9ν19 is 7
0m (12B type rotor...572cc)
It is said that That is, the width of the rotor 28 held by the eccentric portion 27 of the second eccentric shaft 23 is set smaller than the widths of the other rotors 20 and 21.

Since the configuration is as described above, the eccentric portion 2 of the second eccentric shaft 23
7, the width of the quarter 28, that is, the displacement, is
Rotor 20 held on eccentric part 18.19 of eccentric shaft 16
? By making it smaller than 21, the first g1i axis 1
The swinging of the small diameter portion 18 with low rigidity of the bearing 6 can be reduced, seizure and damage of the fixed gear 35 and the cover member 38 can be prevented as much as possible, and the exhaust ffi can be easily adjusted.

Although this embodiment discloses a combination of an IOA type rotor and a 12B type rotor, it can be applied to combinations with various types of rotors.

[Brief explanation of the drawing]

The figure shows an embodiment of the invention. FIG. 1 is an overall view of a multi-cylinder rotary piston engine. 16......First eccentric shaft (eccentric shaft), 17...Large diameter section, 18...
・・・・・・・・・・・・Small diameter part, 19・・・・・・
...... Eccentric part (first eccentric shaft) *20t21
s28・・・・・・・・・・・・・・・-Ita, 23・
...... Second eccentric shaft (eccentric shaft), 25.
・・・・・・・・・・・・・・・Taper part, 27...
・・・・・・・・・・・・Eccentric part (2nd i center axis).

Claims (1)

[Claims] (1) A large diameter part having an eccentric part on the outer periphery and a small diameter part smaller in diameter than the large diameter part, and between the small diameter part and the large diameter part, from the small diameter part to the large diameter part. a first eccentric shaft formed with a tapered portion that increases in diameter as it extends toward;
A rotor is formed by holding a rotor in each eccentric part of an eccentric shaft having an eccentric part on the outer periphery and a hollow second eccentric shaft whose inner diameter part is press-fitted into the small diameter part and the tapered part. A multi-cylinder rotary piston engine, characterized in that the width of the rotor held by the eccentric portion of the second eccentric shaft is smaller than the width of the rotor held by the eccentric portion of the first eccentric shaft. Structure of rotary piston engine.