JPH0128243Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an eccentric shaft for a multi-cylinder rotary piston engine having at least three or more cylinders.

(Prior art) In a multi-cylinder rotary piston engine, when the number of cylinders increases to three or more, the number of eccentric shafts also increases to three or more, and it is said that assembly is difficult if three or more eccentric parts are formed on one eccentric shaft. For assembly reasons, it has been proposed that the eccentric shaft be divided into at least two parts for assembly (Utility Model Act 1973-
(See Publication No. 14723).

Such an eccentric shaft is divided into a first eccentric shaft having two eccentric parts and a second eccentric shaft having one eccentric part, and the tip of the first eccentric shaft and the tip of the second eccentric shaft are separated. and the second eccentric shaft is fitted with a bolt into a through hole opened in the eccentric shaft, and a threaded portion is formed at the tip of the first eccentric shaft to be screwed into the bolt, This bolt is used to connect the first eccentric shaft and the second eccentric shaft, but it is a so-called cantilever type construction in which the first eccentric shaft and the second eccentric shaft are connected at their tips. Because of this, engine vibration causes the end of the second eccentric shaft that is far from the tip that contacts the tip of the first eccentric shaft to swing significantly in the radial direction, causing the gear fixed to that part to move outward. There was a risk that the inner gear of the rotor located on the other side would be damaged due to repeated collisions.

(Purpose of the invention) The present invention has been made in view of the above points, and an object thereof is to provide an eccentric shaft for a multi-cylinder rotary piston engine that prevents the second eccentric shaft from swinging in the radial direction with respect to the first eccentric shaft due to engine vibration. With the goal.

(Structure of the invention) The structure of the invention is that a large diameter part having an eccentric part on the outer periphery and a small diameter part extending from the large diameter part are integrally formed, and a gap between the large diameter part and the small diameter part is formed. 1st
A first eccentric shaft formed with an inclined surface and an eccentric portion on the outer periphery, forming a through hole into which the small diameter portion of the first eccentric shaft is loosely fitted, and the above-mentioned portion on the large diameter side of the through hole. a second eccentric shaft formed with a second inclined surface that abuts the first inclined surface; and a second eccentric shaft that is fitted into the small diameter portion of the first eccentric shaft and is located on the opposite side of the second inclined surface. The present invention is characterized by comprising a regulating member that regulates the movement of the end portion in the radial direction, and a fastening member that presses the regulating member in the direction of the large diameter portion of the second eccentric shaft.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows the overall configuration of a multi-cylinder rotary piston engine. 1 is a multi-cylinder (3-cylinder) rotary piston engine body, end side housings 2, 3, intermediate side housings 4, 5, and a rotor housing. 6 to 8, the rotor housing 6 is kept airtight by the end side housing 2 and the intermediate side housing 4 to form the working chamber 9 of the first cylinder, and the rotor housing 7 is formed by the intermediate side housing 4. 4 and 5 to form the working chamber 10 of the second cylinder, and the rotor housing 8 is kept airtight by the end side housing 3 and the intermediate side housing 5 to form the working chamber 11 of the third cylinder. is formed.
Note that 12 to 20 are cooling water passages.

Each housing 2-8 has positioning pins 21-23
are positioned with respect to each other, and are tightened and connected by a tension bolt 24.

The engine body 1 has a first main body extending from the end side housing 2 to the end side housing 3.
An eccentric shaft 28 is inserted therethrough. This first eccentric shaft 2
8 is integrally formed with a large diameter part 29 extending in the axial direction and a small diameter part 30 extending from the large diameter part 29 and having a smaller diameter than the large diameter part 29, and the large diameter part 29 is formed on the end side. The small diameter portion 30 extending from the housing 2 to the intermediate side housing 5 is configured to protrude from the intermediate side housing 5 to the rotor housing 8 and the end side housing 3 to the outside. Eccentric shafts 31 and 32 are formed in the large diameter portion 29 at portions facing the working chambers 9 and 10, respectively, and triangular rotors 33 and 34 are attached to the eccentric portions 31 and 32, respectively. A flywheel 36 is attached to the large diameter end 35 of the first eccentric shaft 28, and a ring gear 3 is attached to the flywheel 36.
7 is attached, and the small diameter end 3 of the small diameter portion 30 is attached.
8 is formed with a threaded portion 39, and attached members 40 such as an oil pump driving sprocket and a balance weight are attached.

Fixed gears 41, 42, 43 are attached to the end side housings 2, 3 and the intermediate side housing 5, respectively, by bolts 44, and the fixed gears 41, 42 also serve as bearings for the first eccentric shaft 28. It's getting old. 41a to 43a are teeth of each of the fixed gears 41 to 43. Inner gears 47, 48 are attached to each rotor 33, 34, and are meshed with fixed gears 41, 42.
The fixed gears 41 and 42 are surrounded by rotors 33 and 34.
It is designed to rotate in a planetary manner.

A cylindrical second eccentric shaft 49 having an eccentric portion 53 is fitted onto the small diameter portion 30 of the first eccentric shaft 28 .
That is, the second eccentric shaft 49 has a through hole 50 extending in the axial direction, and the small diameter portion 3 is inserted into the through hole 50.
0 is loosely fitted. The first eccentric shaft 28 has a large diameter portion 2
A tapered portion 51 as a first inclined surface is formed between the small diameter portion 9 and the small diameter portion 30, and the diameter of the tapered portion 51 gradually increases from the small diameter portion 30 toward the large diameter portion 29. Further, the through hole 50 has a tapered hole 52 as a second inclined surface formed on the side closer to the large diameter portion 29, and this tapered hole 52 is in contact with the tapered portion 51, and the tapered portion 51 and the tapered hole 52 are different from each other. Eccentric part 5
This functions as the axial positioning means of No. 3. The eccentric part 53 is located in the working chamber 11 of the third cylinder, a rotor 54 is attached to the eccentric part 53, an inner gear 55 is fixed to the rotor 54, and the inner gear 55 meshes with the fixed gear 43. . The inner gear 55 and the rotor 54 rotate planetarily around the fixed gear 43.

Further, as shown in detail in FIGS. 2a and 2b, at the end of the second eccentric shaft 49 opposite to the tapered hole 52, another tapered hole 60 whose diameter becomes smaller toward the tapered hole 52 side is provided. is formed in the tapered hole 60, and a first hole is formed in the tapered hole 60.
The notch 61 is fitted into the small diameter end 38 of the eccentric shaft 28.
Tapered portion 61b of annular regulating member 61 having a
is in constant contact. However, this regulating member 6
1 is connected to the small diameter portion 30 via the attached member 40 by a nut 58 as a fastening member that is screwed into the threaded portion 39 formed on the small diameter end 38 of the first eccentric shaft 28.
and the tapered hole 52 is in the axial direction of the tapered part 5
1, and movement of the second eccentric shaft 49 in the radial direction is restricted. Since the second eccentric shaft 49 is loosely fitted into the small diameter portion 40, it is easy to insert the second eccentric shaft 49 into the small diameter portion 30. In addition, the taper hole 5
A second eccentric shaft 49 and a first eccentric shaft 2 are provided on the inner peripheral surface of the shaft 2.
In order to prevent relative rotation with 8 as much as possible, copper plating is applied to increase the coefficient of friction.
Porous chrome plating is applied to the outer peripheral surface of the tapered portion 51.
Ceramic coating is applied using the ion plating method.

Note that 62 and 63 are bearings for the first eccentric shaft 28, 64 are bearings for the second eccentric shaft 49, and 65 are each eccentric portion 3 of the first eccentric shaft 28.
1 and 32, a key for positioning the eccentric portion 53 of the second eccentric shaft 49 in the rotational direction, 66 a key for positioning the attached member 40 in the rotational direction, and 67 a positioning pin. be.

In the above embodiment, the regulating member 61 is
It is configured to have a substantially trapezoidal cross section with b.
As shown in the figure, the regulating member 70 may have a circular cross section. 70a is a notch.

Further, in the above embodiment, the attached member 40
and the nut 5 via the regulating member 61 or 70.
8 and the threaded portion 39 to press the second eccentric shaft 49 toward the large diameter portion 29 of the first eccentric shaft 28 . A collar may be interposed between the control member 61 or 70 and the pressure may be pressed through the collar. In addition, the attached member 4
0 is omitted and the regulating member 61 or 7 is replaced by the nut 58.
It is also possible to press 0 directly.

Further, in the above embodiment, an example in which the present invention is applied to a three-cylinder rotary piston engine has been described, but it goes without saying that the present invention can also be applied to engines with four or more cylinders. In that case, in the above embodiment, the eccentric shaft is divided into two, the first eccentric shaft and the second eccentric shaft, but in the case of a multi-cylinder rotary piston engine with four or more cylinders, the second eccentric shaft has two eccentric shafts. It is also possible to provide an eccentric portion, or to provide a configuration in which two second eccentric shafts are provided and a plurality of them are supported by the small diameter portion of the first eccentric shaft.

(Effects of the Invention) Since the present invention is configured as described above, it is possible to suppress the vibration of the second eccentric shaft in the radial direction with respect to the first eccentric shaft due to engine vibration, and it is possible to prevent damage to the inner gear of the rotor.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall configuration diagram of a multi-cylinder rotary piston engine, FIG. 2a is a detailed view of the main part of FIG. 1, FIG. FIG. 3 is a diagram similar to FIG. 2a for a modified example. 1... Engine body, 28... First eccentric shaft, 2
9... Large diameter part, 30... Small diameter part, 31, 32, 5
3... Eccentric part, 47, 48, 55... Inner gear, 49... Second eccentric shaft, 50... Through hole, 51
... Tapered part, 52, 60 ... Tapered hole, 61,
70...Regulation member.

Claims (1)

[Scope of utility model registration request] A large diameter portion having an eccentric portion on the outer periphery and a small diameter portion extending from the large diameter portion and having a smaller diameter than the large diameter portion are integrally formed, and a first inclined surface is provided between the large diameter portion and the small diameter portion. a first eccentric shaft having an eccentric portion on its outer periphery, a through hole into which a small diameter portion of the first eccentric shaft is loosely fitted, and a first eccentric shaft formed on a large diameter side of the through hole. a second eccentric shaft having a second inclined surface that abuts the inclined surface; and a radius of an end of the second eccentric shaft that is fitted into the small diameter portion of the first eccentric shaft and is opposite to the second inclined surface. An eccentric shaft for a multi-cylinder rotary piston engine, comprising: a regulating member that regulates movement in the direction; and a fastening member that presses the regulating member in the direction of the large diameter portion of the second eccentric shaft.