JPS6069209A - Casing of multicylinder rotary piston engine - Google Patents

Abstract

PURPOSE:To prevent the generating of a stress between an eccentric shaft and a bearing by a method wherein the outside sidehousing of a rotor housing is shifted for the inside sidehousing located at the opposite side via the rotor housing. CONSTITUTION:Under the first and second cylinders 9, 10 are assembled in fitted condition, even in case that the axial line of the first eccentric shaft 28 is inclined for the horizontal line, after the first eccentric shaft 28 is engaged with the second eccentric shaft 49, the rotor 54 of the third cylinder 11 is engaged with an eccentric part 53, therefore, an outside sidehousing 3 and a rotor housing 8 are fixed with a positioning pin 23 for preventing the shifting in respective radial direction. The exterior diameter of the protruded end part for an inside sidehousing 5 of the pin 23 is made smaller than the diameter of a positioning hole 5a for absorbing the shifted portion due to the inclination of the first eccentric shaft, further, the rotor housing 8 is formed to be movable in radial direction. Therefore, the pin 23 can be easily engaged to the hole 5a. By such a structure, the generation of a stress between the eccentric shaft and the bearing caused by the deflection of the eccentric shaft can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a casing for a multi-cylinder rotary piston engine, in which an eccentric shaft is rotatably supported by the casing in at least three or more portions in the direction in which the eccentric shaft extends. It is something.

(Prior Art) In a multi-cylinder rotary piston engine, each cylinder is connected by a plurality of casing components consisting of an outer side housing, an inner side housing, and a rotor housing, as disclosed in Japanese Utility Model Publication No. 55-14723, for example. It is known that the eccentric shaft is formed so as to pass through the casing component, and that the eccentric shaft is rotatably supported by the casing in at least three or more parts in the extending direction of the eccentric shaft. There is.

Each casing component is provided with a fixed gear (external gear) corresponding to each cylinder, and an eccentric shaft passes through this fixed gear, and this fixed gear is attached to a rotor. In order to align the axes of each fixed gear with the same straight line -L, positioning pins for positioning the casing are used to determine the relative position of each casing component. It is carried out. This device aligns the axes of two fixed gears supported by a casing component, and inserts a first eccentric shaft having two eccentric portions among the split eccentric shafts into the fixed gear. First, both end portions of the first eccentric shaft are supported by the casing component via a fixed gear, and then a second eccentric shaft having one eccentric portion of the divided eccentric shafts is attached to the end of the first eccentric shaft by bolts. After connecting, the rotor housing,
By assembling the rotor and outer side housing,
The split eccentric shaft is rotatably supported by the casing at three locations: an intermediate portion and both end portions.

However, when the casing constituting the cylinder on the first eccentric shaft side is assembled, due to manufacturing errors in the casing components, the axial center of the eccentric shaft becomes oblique to the axial center of the fixed gear that supports it. The unsupported end, i.e. the end that has not been assembled, of the eccentric shaft on the cylinder side may be at a position away from the axis of the fixed gear (bearing) that supports this eccentric shaft. In that case, in order to align each axis of the fixed gear (bearing) on the same straight line, correct the oblique inclination of the eccentric shaft, and rotatably support the eccentric shaft in the casing, the assembly has already been carried out. If the rotor housing of the end cylinder to be assembled is forcibly positioned and installed with the positioning pin against the outer side housing of the intermediate cylinder that is attached, the eccentric shaft will cross the supported intermediate part. There are undesirable problems such as bending, stress, uneven wear of the bearings, and increased vibration of the eccentric shaft.

(Object of the Invention) The present invention has been made in view of the problems of the prior art described above, and its object is to provide a structure in which an eccentric shaft is rotatably supported by a casing at both end portions and an intermediate portion thereof. An object of the present invention is to provide a casing for a multi-cylinder rotary piston engine in which stress is minimized when supporting an eccentric shaft in the casing.

(Configuration of the Invention) The configuration of the present invention includes an outer side housing having a fixed gear and a rotor housing that cooperates with the outer site housing to form a working chamber in a casing forming a cylinder existing at an end. The outer side housing and the rotor housing and the inner side housing can be moved in the radial direction of the eccentric axis with respect to the inner side housing located on the opposite side of the outer side housing through this rotor housing while remaining fixed. If the axes of multiple fixed gears that support the eccentric shaft do not align with each other on the same horizontal line, the axes of the eccentric shafts may be tilted diagonally relative to the axis of the fixed gear. By inserting the fixed gear along the eccentric shaft without any difficulty, the eccentric shaft can be rotatably supported by the casing at its intermediate portion and both end portions.

(Example) An example of an eccentric shaft of a multi-cylinder rotary piston engine according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of a multi-cylinder rotary piston engine to which the eccentric shaft according to the present invention is applied. Piston engine body
has an outer sight housing 2.3, an inner side housing 4.5 and a rotor housing 6 to 8 as casing components, the rotor housing 6 being separated by the outer side housing 2 and the inner side housing 4. The rotor housing 7 is kept airtight by the inner side housing 4.5 to form a working chamber 9, and the rotor housing 8 is kept airtight by the inner side housing 4.5 to form a working chamber 10. The working chamber 11 is maintained airtight by the housing 5, and the working chamber 12 is
-20 are cooling water passages. The respective housings 2 to 8 are positioned with respect to each other by hollow positioning pins 21 to 23, and are tightened and connected by tension bolts 24. In FIG. 2, 25 is an insertion hole of this tension port 24, and 26 is a 27 indicates an intake hole, and 27 indicates an exhaust hole.

The multi-cylinder rotary piston engine body 1 is provided with a first eccentric shaft 28 that passes through the multi-cylinder rotary piston engine body 1 from the outer side housing 2 toward the outer side housing 3. This first eccentric shaft 28
has a large diameter portion 29 extending in the axial direction and a small diameter portion 30 having a smaller diameter than the large diameter portion 29. Here, the large diameter portion 29 extends from the outer side housing 2 to the inner side housing 5. The small diameter portion 30 is configured to extend across the
It is configured to protrude from the inner side housing 5 to the outside via the rotor housing 8 and the outer side housing 3. In the large diameter portion 29, an eccentric portion 31 is formed in a portion facing the working chamber 9, and an eccentric portion 32 is formed in a portion facing the working chamber IO.
are formed, and triangular rotors 33, 34 as shown in FIG. 2 are attached to these eccentric parts 31, 32, respectively. Here, a flywheel 36 is attached to the large diameter end 35 of the first eccentric shaft 28, 37 indicates a ring attached to the flywheel, and a small diameter end 38 of the small diameter section 30 is attached to the first eccentric shaft 28. , a port portion 39 is formed, and a member 40 is attached to the attached member.

The outer side housing 2, the outer side housing 3, and the inner side housing 5 have fixed gears 41.42.4.
3 are respectively attached by ports 44, and the fixed gears 41 and 42 are configured so that the bearings of the first eccentric shaft 28 also serve as the bearings, 45 and 46 indicate the bearings, and 41a to 43a are the respective fixed gears. The teeth of gears 41 to 43 are shown. Each rotor 33, 34 has an internal gear 4.
7.48 is attached, and its teeth are teeth 41a, 42a.
The internal gears 47 and 48 are screwed into the rotor 33.
．． 34 and rotates planetarily around fixed gears 41 and 42.

A hollow second eccentric shaft 49 is provided in the small diameter portion 30 of the first eccentric shaft 28 . As shown in FIG. 3, the second eccentric shaft 49 has a through hole 50 extending in its axial direction, and the small diameter portion 30 is configured to fit into this through hole 50. The first eccentric shaft 28 has a tapered part 51 formed between its large diameter part 29 and small diameter part 30, as shown in FIG.
The diameter of the through hole 50 gradually increases as it extends toward 9, and a tapered hole 52 is formed in the through hole 50 on the side closer to the tapered portion 51.
are press-fitted, and the tapered part 51 and the tapered hole 52
The second eccentric shaft 49 functions as an axial positioning means for the eccentric portion 53 formed on the second eccentric shaft 49. Eccentric part 53
is positioned in the working chamber 11, and this eccentric portion 53
A rotor 54 is attached to the rotor 54, and an internal gear 55 is fixed to the rotor 54, and its teeth are connected to the fixed gear 43.
The internal gear 55 meshes with the tooth portion 43a of the fixed gear 43, and the internal gear 55 rotates planetarily around the fixed gear 43 together with the rotor 54. Here, the fixed gear 43 is the second eccentric shaft 4
The bearing 9 also serves as a part, and the numeral 56 is the bearing.

The second eccentric shaft 49 is inserted into the small diameter portion 30 from the small diameter end 38, and between the small diameter portion 30 and the second eccentric shaft 49, the rotation direction of the eccentric portion 53 of the second eccentric shaft 49 is A key 57 is provided for positioning each eccentric portion of the first eccentric shaft 28. The second eccentric shaft 49 is connected to the bolt portion 3
The nut 58 screwed into the member 9 is attached to the small diameter portion 30 through the member 40 in the axial direction of the small diameter portion 30 and presses the tapered hole 52 in a direction toward the tapered portion 51. 5
7' is a key for preventing movement of the attached member 40 (for example, a gear for driving an auxiliary device such as an oil pump) in the rotational direction. The second eccentric shaft 49 is fitted into the small diameter portion 30 while being press-fitted, and here, the portion near the end on the side far from the end where the tapered hole 52 is formed is the press-fit portion 50a.
The press-fitting portion 50a is press-fitted into the small-diameter portion 30, and the second eccentric shaft 49 is press-fitted by the tapered portion 51 and the press-fitting portion 50a, so that the second eccentric shaft 49 cannot rotate relative to the first eccentric shaft 28. The space between the tapered hole 52 and the press-fitting part 50a is a non-press-fitting part 50b which is not press-fitted into the small diameter part 030, making it easy to insert the second eccentric shaft 49 into the small diameter part 30. The goal is to

The outer side housing 2, the rotor housing 8, and the inner side housing 4 constitute a first cylinder, and the inner side housing 4, the inner side housing 5, and the rotor housing 7 constitute a second cylinder. and the inner side housing 5 and the outer side housing 3
and the rotor housing 8 constitute a third cylinder, in which the first cylinder and the third cylinder are located at the ends, and the first eccentric shaft 28 and the second eccentric shaft 49
The eccentric shaft consisting of is configured to pass through the fixed gears 41, 42, 43, and its both end portions and middle portion are supported by each casing via the fixed gears 41, 42, 43. There is.

Here, the outer side housing 3 and the rotor housing 8, which constitute a part of the third cylinder, can be shifted in position with respect to the inner side housing 5 in the radial direction of the eccentric shaft. 5 and 6 are for explaining this. As shown in FIG. 2, the positioning pins 23 provided at two locations, upper and lower, have an end that is fitted into the inner side housing 5. The diameter is reduced to form a reduced diameter portion 23a, and the outer diameter of the reduced diameter portion 23a is determined by the positioning hole 5 formed in the inner side housing 5.
The enlarged diameter portion 23b has an outer diameter that is approximately the same as the positioning hole diameter of the outer side housing 3 and the positioning hole diameter of the rotor housing housing 8. Positioning accuracy with respect to the rotor housing 8 can be ensured. The positioning pin 23 is loosely fitted into the positioning hole 5a, and the outer side housing 3 and the rotor housing 8 are integrally connected to the inner side housing while ensuring the positioning accuracy between the outer side housing 3 and the rotor housing 8. The outer side housing 3 and the rotor housing 8 can be assembled to the inner side housing 5 by shifting their positions in the radial direction of the eccentric shaft with respect to the inner side housing 5 using a tension port.

With this configuration, even if the axis of the first eccentric shaft 28 is inclined with respect to the horizontal line when the first cylinder and the second cylinder are assembled, the first eccentric shaft 28 After fitting the second eccentric shaft 49 to the eccentric portion 53 of the second eccentric shaft 49, the rotor 54 is fitted to the eccentric portion 53 of the second eccentric shaft 49, and then the outer side housing 3 and the rotor housing 23 are displaced from each other in the radial direction by the positioning pin 23. The outer diameter of the end of the casing of the third cylinder, which is fixed such that it is fixed so that it does not move toward the inner side housing 5, is smaller than the hole diameter of the positioning hole 5a of the inner side housing 5 so as to be able to sufficiently absorb the shift due to the above-mentioned inclination. Since the rotor housing 8 is movable in the radial direction of the eccentric shaft, the positioning pin 23 can be easily fitted into the positioning hole 5a.

Although the embodiments have been described above, the present invention is not limited thereto, and includes, for example, the following cases.

9) In the embodiment, the eccentric shaft was explained as having a two-divided configuration of the first eccentric shaft and the second eccentric shaft, but the present invention is also applicable to a partial configuration in which the eccentric shaft is not divided. It is possible.

In the embodiment, the eccentric shaft is rotatably supported at three locations on the casing, but it may be supported at four or more locations.

■In the example, the diameter of the end of the locating pin facing the inner side housing was reduced and it was loosely fitted into the locating hole formed in the inner side housing, but the locating pin was not reduced in diameter. Alternatively, the diameter of the positioning hole formed in the inner side housing may be made larger than the outer diameter of the positioning pin so that the positioning pin can be fitted loosely therein.

In the O embodiment, a positioning pin that partially extends from the outer side housing 3 to the inner side housing 5 is used, but the positioning pin is divided into two parts at the part where it passes through the rotor housing 8. You can also do that.

4 (Effects of the Invention) As described in 1-1 below, the present invention provides a method in which the unsupported end of the eccentric shaft, which is previously supported by the casing component at the intermediate portion and the end portion, is supported later. When the eccentric shaft is rotatably supported by the casing component, the axial center of the eccentric shaft is a fixed gear (bearing) that supports the eccentric shaft first.
Even if the eccentric shaft is installed obliquely to the axis of the fixed gear (bearing),
Since the eccentric shaft can be rotatably supported by the middle part and both end parts of the eccentric shaft while being tilted diagonally with respect to the axis of the eccentric shaft, the eccentric shaft is bent and the space between the eccentric shaft and the bearing is The generation of stress can be prevented as much as possible.

[Brief explanation of drawings]

FIG. 1 is an overall 4R diagram of a multi-cylinder rotary piston engine according to the present invention. FIG. 2 is an internal configuration diagram of a multi-cylinder rotary piston engine according to the present invention. 3 and 4 are side views of the eccentric shaft according to the present invention. FIG. 5 is a partial cross-sectional view showing the main structure of the casing of the multi-cylinder rotary piston engine according to the present invention. FIG. 6 is a sectional view taken along line X-X in FIG. 5. l...Multi-cylinder rotary piston engine body 2.3...
Outer side housing 4-6 Inner side housing 6-8 Rotor housing 9-11 Working chamber 21 Locating pin 22 Positioning pin 23 Locating pin 33 Rotor 34 Rotor 28・First eccentric shaft 4 construction...Fixed gear 42...Fixed gear 43...Fixed gear 49...Second eccentric shaft 6 54...Rotor 7 Procedural amendment (voluntary) October 31, 1980 Commissioner of the Japan Patent Office Display of the case 1982 Patent Application No. 166800 2 Name of the invention Casing of a multi-cylinder rotary piston engine 3 Relationship to the case of person who corrects the casing of a multi-cylinder rotary piston engine Patent applicant May 19, 1980 Name (313) Mazda Motor Corporation Name changed (all at once) 4 Agents 〒105 Location (50B) 1801 Drawing (Figure 1) 6 Contents of amendment Figure 1 of the drawings will be amended as shown in the attached drawing. 7. Inventory correction drawing of attached documents (Figure 1)

Claims (1)

[Claims] (1) In a multi-cylinder rotary piston engine in which an eccentric shaft is rotatably supported in a casing at both end portions and an intermediate portion thereof, a piston that constitutes the casing of one of the cylinders at both ends and meshes with the internal gear of the rotor. An outer side housing provided with an externally toothed gear and a rotor housing are fixed to each other by a locating pin, such that the rotor housing can be moved in the radial direction of the eccentric shaft relative to the inner side housing. A casing for a multi-cylinder rotary piston engine, characterized in that the housing is positioned on an inner side housing by a locating pin.