JPH0322484Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bearing device for a rotary piston engine.

(Prior art) Generally, when the number of rotors is increased to increase the output of a rotary piston engine, the number of housings increases and the drive shaft becomes longer due to this multi-cylinder design (Japanese Patent Laid-Open No. 60-69208) reference). When the drive shaft is supported in the housing, the center of the bearing part and the center of the drive shaft do not match due to manufacturing errors, and as the drive shaft rotates, a large locally biased force is applied to the bearing part. comes into play,
Seizure of the bearing member may occur.

In other words, the housing of a rotary piston engine is installed by positioning the end side housing, the rotor housing, and the intermediate side housing (intermediate housing) in order, and even if the error between the individual housings is small, these If they are piled up, there will be a large error at both ends, and since the drive shaft is long, there are three or more bearings on the drive shaft, so when assembled, the drive shaft will hit the bearing members unevenly. .

(Purpose of the invention) In view of the above-mentioned circumstances, the present invention provides a bearing device for a rotary piston engine that absorbs the misalignment between the center of the drive shaft and the bearing portion caused by manufacturing errors in the housing of the rotary piston engine. The purpose is to

(Structure of the invention) The bearing device of the invention includes an eccentric member interposed between the drive shaft and the housing in the bearing portion of the drive shaft,
The present invention is characterized in that the centers of the drive shaft and the bearing portion are made to coincide with each other by adjusting the eccentric member.

(Effects of the invention) According to the invention, an eccentric member is provided in the bearing portion of the drive shaft, and this eccentric member can absorb the deviation of the center of the drive shaft caused by manufacturing errors of the housing. Seizure and uneven wear of bearing members can be prevented. Furthermore, the management of manufacturing accuracy and assembly accuracy of each part is reduced, and manufacturing costs can be reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing the overall configuration of a three-cylinder rotary piston engine.

The three-cylinder rotary piston engine main body 1 has end side housings 2, 3, intermediate side housings 4, 5, and rotor housings 6-8. The first rotor housing 6 is kept airtight by the side housing 2 at one end and the intermediate side housing 4 to form the working chamber 9 of the first cylinder, and the second rotor housing 7 is connected to the intermediate side housings 4 at both ends. , 5 to maintain airtightness.
A working chamber 10 of the cylinder is formed, and the third rotor housing 8 is kept airtight by the other end side housing 3 and the intermediate side housing 5 to form a working chamber 11 of the third cylinder. Cooling water passages 12-20 are formed in each housing 2-8.

Further, the housings 2 to 8 are positioned relative to each other by hollow positioning pins 21 to 23, and are fastened and connected by tension bolts 24.

Further, a drive shaft 27 is provided that passes through the engine body 1 from the side housing 2 at one end to the side housing 3 at the other end.
This drive shaft 27 is composed of a first eccentric shaft 28 and a second eccentric shaft 29. The first eccentric shaft 28 penetrates from one end of the engine body 1 to the other end, and the second eccentric shaft 28
9 is formed short.

The first eccentric shaft 28 has a large diameter part 28a and a small diameter part 28b, and the large diameter part 28a has a first eccentric part 31 in a part facing the first working chamber 9 and a part facing the second working chamber 10. A second eccentric portion 32 is formed at the facing portion, and first and second rotors 33 and 34 are rotatably supported on the first and second eccentric portions 31 and 32, respectively. Further, a flywheel 35 is attached to the end of the large diameter portion 28a of the first eccentric shaft 28, a bolt portion 36 is formed at the end of the small diameter portion 28b, and accessory drive gears 37, 3 are formed.
8, sleeves 39, 40, etc. are inserted.

A hollow second eccentric shaft 29 is fitted into the small diameter portion 28b of the first eccentric shaft 28. A third eccentric portion 41 is formed in the second eccentric shaft 29 at a portion facing the third working chamber 11.
1, a third rotor 42 is rotatably supported. The second eccentric shaft 29 is positioned relative to the first eccentric shaft 28 in the rotational direction by a key 43, and the nut 4 is connected to the bolt portion 36 of the first eccentric shaft 28.
4, the drive shaft 27 is assembled via the gears 37, 38, sleeves 39, 40, etc.

The bearing of the drive shaft 27 with respect to the engine body 1 is such that the tip of the first eccentric shaft 28 at one end is connected to the side housing 2 at one end, and the first eccentric shaft 28 at the middle part is connected to the wide intermediate side housing 2. and the second eccentric shaft 29 at the other end is connected to the bearing member 4 with respect to the side housing 3 at the other end.
5, 46, 47 (metal) and fixed gear 48,
The fixed gears 48 to 50 are rotatably supported via the housings 2, 5, and 3, respectively. Tooth portions 48a of the fixed gears 48 to 50
50a is meshed with the internal gears 51, 52, 53 of each rotor 33, 34, 42, and the rotor 3
3, 34, and 42 planetary rotational motions are obtained.

In the structure in which the drive shaft 27 is supported by three bearing portions, at the bearing portion of the other end of the drive shaft 27 for the second eccentric shaft 29, as shown in cross section in FIG. A bearing member 47 (metal) is fitted onto the outer periphery of the second eccentric shaft 29 that is fitted onto the first eccentric shaft 28, and a sleeve-shaped eccentric member 5 is further attached to the outer periphery of the fixed gear 50 attached to the outer periphery of the bearing member 47 (metal).
5 is interposed between the end side housing 3 and the end side housing 3.

The eccentric member 55 is formed in the shape of an eccentric sleeve in which the center of the outer circumferential surface 55a and the center of the inner circumferential surface 55b are shifted by a predetermined amount, and the eccentric member 55 is eccentric to the center of the drive shaft 27 supported by the other two bearings. The center of the inner circumferential surface 55b of the member 55 is made to coincide with the center of the inner circumferential surface 55b of the member 55, thereby absorbing center deviations due to manufacturing errors and assembly errors. In reality, each housing 2 to 8 and the drive shaft 27 are assembled, and the amount of eccentricity of the drive shaft 27 at the bearing portion with respect to the second eccentric shaft 29 is measured. It is to be adjusted by attaching it.

With the above structure, the drive shaft 27 is well supported by the bearing members 45 to 47 by using the eccentric member 55, and the abnormal load due to center deviation can be eliminated, and seizure and abnormal wear can be prevented. It is something that can be prevented.

In the above embodiment, the eccentric member 55 made of an eccentric sleeve is interposed on the outer periphery of the fixed gear 50, but in addition, the bearing member 47 of the bearing portion may be formed into an eccentric shape to constitute an eccentric member. Alternatively, the inner diameter of the fixed gear 50 may be formed eccentrically, and the fixed gear may be configured as an eccentric member.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view showing the overall configuration of a rotary piston engine equipped with a bearing device according to an embodiment of the present invention, and FIG. 2 is a side view of the rotary piston engine showing the bearing section in section. 1...Rotary piston engine body, 2, 3...
End side housing, 4, 5... Intermediate side housing, 6-8... Rotor housing, 21-23
...Positioning pin, 27...Drive shaft, 28...First eccentric shaft, 29...Second eccentric shaft, 33, 34, 42...Rotor, 45-47...Bearing member, 48-50...Fixed gear, 55...Eccentric member.

Claims (1)

[Scope of utility model registration request] A bearing device for a rotary piston engine that includes a plurality of rotors, is provided with a large number of housings, and supports a drive shaft passing through the housing,
A bearing device for a rotary piston engine, characterized in that an eccentric member is interposed between the drive shaft and the housing in the bearing portion of the drive shaft to absorb deviation of the center of the drive shaft.