JPS6069205A - Multicylinder rotary piston engine - Google Patents

Abstract

PURPOSE:To contrive to prevent an eccentric shaft from abrasion by a method wherein a filler disappearing under the rotating of an engine is provided between a concentrical bearing for a fixed gear and the eccentric shaft, then prevent a bearing from unsymmetrical contacting for the eccentric shaft. CONSTITUTION:When an outside side-housing 3 and a housing of a rotor 54 are fixed, in assembled manner, to an inside side-housing between the bearing 56 of a fixed gear 43 mounted on the side-housing and the second eccentric shaft 49, a filler 59 is provided to prevent the bearing 56 from unsymmetrical contacting for the eccentric shaft 49. The filler 59 is formed on the outer periphery surface of the eccentric shaft 49 or on the inner periphery surface of the bearing 56 by coating a molybdenum disulfide at the 120 deg. symmetrical position in periphery direction with designated space in axial direction. Thereby, at the initial phase of the rotation of an engine, the lubrication of a bearing part can be achieved by the early abrasion and extinction of the filler, accordingly, the abrasion caused by the unsymmetrical contacting of the eccentric shaft can be prevented.

Description

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

(Prior Art) As disclosed in Japanese Utility Model Publication No. 55-14723, a multi-cylinder rotary piston engine has a plurality of casing components each consisting of an outer side housing, an inner side housing, and a rotor housing. It is known that a cylinder is formed, an eccentric shaft is passed through the casing component, and the eccentric shaft is rotatably supported by the casing at three locations in the extending direction of the eccentric shaft.

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 on the same straight line, a positioning pin for positioning the casing is used to determine the relative position of each casing component. Is going. 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 the connection, the rotor housing, rotor, and outer side housing are assembled, so that the split eccentric shaft is rotatably supported by the casing at three locations: the 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.

Therefore, among the casings that form the cylinders present at the ends, the outer side housing having the fixed gear and the rotor housing that cooperates with the outer side housing to form the working chamber are fixed, and the rotor housing is The eccentric shaft is configured to position the outer side housing, the rotor housing, and the inner side housing so that the eccentric shaft can be shifted in the radial direction with respect to the inner side housing located on the opposite side of the outer side housing. While the shaft center is tilted diagonally with respect to the fixed gear's shaft center, the fixed gear is inserted smoothly along the eccentric shaft, and the eccentric shaft is rotatably supported in the casing at its middle and both ends. The applicant previously filed a patent application for a device that made it possible to do this.

With this configuration, it is possible to prevent the generation of stress on the eccentric shaft when the eccentric shaft is rotatably supported in the casing, but the eccentric shaft is If the shaft center of the eccentric shaft is assembled with eccentricity, the support end of the eccentric shaft will hit the peripheral wall of the bearing formed concentrically with the fixed gear, causing uneven wear of the part of the eccentric shaft and the bearing. There is a possibility that it will.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the axial center of the eccentric shaft from being obliquely inclined with respect to the axial center of the bearing concentric with the fixed gear. To provide a multi-cylinder rotary piston engine in which the axis of an eccentric shaft is prevented from coming into partial contact with the inner circumferential wall of a bearing as much as possible even when the engine is in use.

(Structure of the Invention) The structure of the present invention is such that, in a casing forming one of the cylinders existing at both ends, an outer side housing having a fixed gear and a working chamber working together with the outer side housing are provided. The outer side housing and the rotor housing are fixed so that the rotor housing can be displaced in the radial direction of the eccentric shaft with respect to the inner side housing located on the opposite side from the outer side housing. In addition to positioning the housing and the inner side housing, a filler that disappears during rotation of the eccentric shaft is provided between the eccentric shaft and a bearing attached to the outer side housing and concentric with the fixed gear. It's where it's set up.

(Example) An example of a multi-cylinder rotary piston engine according to the present invention will be described below based on the drawings.

FIG. 1 shows the overall configuration of a multi-cylinder rotary piston engine according to the present invention. It has an outer side housing 2.3, an inner side housing 4.5, and rotor housings 6 to 8 as elements, and the rotor housing 6 is kept airtight 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 outer valveoid housing 3 and the inner side housing 5. It is held to form a working chamber 11, and 12 to 20 are cooling water passages. Each housing 2 to 8 has a hollow positioning pin 21 to
23, and are tightened and connected by a tension bolt 24, and in FIG. 2, 25 is an insertion hole for the tension bolt 24;
26 is an intake hole, and 27 is 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 rotor housing 8 to the outside via 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. Triangular rotors 33 and 34 are respectively attached. 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 the small diameter end 3 of the small diameter portion 30 is attached to the first eccentric shaft 28 .
8, a bolt portion 39 is formed. At the same time, 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 fixed gears 4
It is assumed that the rotors 33 and 34 rotate planetarily around 1.42 mm.

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 the side of the through hole 50 that is closer to the tapered portion 51 is a tapered hole 52, and this tapered hole 52 is press-fitted into the tapered portion 51. , the tapered portion 51 and the tapered hole 52 are the second
It functions as an axial positioning means for the eccentric portion 53 formed on the eccentric shaft 49. The eccentric part 53 is positioned in the working chamber 11, and a rotor 54 is attached to the eccentric part 53. An internal gear 55 is fixed to the rotor 54, and its teeth are similar to the teeth s of the fixed gear 43.
43a, and the internal gear 55 rotates planetarily around the fixed gear 43 together with the rotor 54. Here, fixed gear 43
The bearing of the second eccentric shaft 49 also serves as a part, and 56 is the bearing.

The second eccentric shaft 49 is inserted into the small diameter portion 30 from the small diameter end 38, and the eccentric portion 53 of the second eccentric shaft 49 is inserted between the small diameter portion 30 and the second eccentric shaft 4'9. A key 57 is provided for positioning each eccentric portion 31 , 32 of the first eccentric shaft 28 in the rotational direction. The second eccentric shaft 49 is attached by a nut 58 screwed into the bolt portion 39 in the axial direction of the small diameter portion 30 through the member 4°, and is pressed in the direction in which the tapered hole 52 approaches the tapered portion 51. It is something that will be done. 57' 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 far from the end where the tapered hole 52 is formed is the press-fit portion 50a. The press-fitting part 50a is press-fitted into the small-diameter part 30, and the second eccentric shaft 49 is press-fitted between the lever part 51 and this press-fitting part 50a, so that it cannot rotate relative to the first eccentric shaft 28. It is supported,
The space between the tapered hole 52 and the press-fitting portion 50a is a non-press-fitting portion 50b that is not press-fitted into the small-diameter portion 30, thereby facilitating the insertion of the second eccentric shaft 49 into the small-diameter portion 30.

The outer side housing 2, the rotor housing 6, 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 gear 41, 42, 43, that is, the bearing 45, 46, 56, and is connected to each casing via the bearing 45, 46, 56 at both end portions and the intermediate portion. is supported.

2 Here, the outer side housing 3 and the rotor housing 8, which constitute a part of the third cylinder, can be shifted in position relative to the inner side housing 5 in the radial direction of the eccentric shaft. 6 are for explaining this, and as shown in FIG.
The end portion on the side to be fitted is reduced in diameter to form a reduced diameter portion 23a, and the outer diameter of the reduced diameter portion 23a is smaller than the hole diameter of the positioning hole 5a formed in the inner side housing 5. The outer diameter of the enlarged diameter portion 23b is the diameter of the positioning hole of the outer side housing 3, and the diameter of the positioning hole of the outer side housing 3.
The diameter of the positioning hole is approximately the same as that of the positioning hole, so that the positioning accuracy between the outer side housing 3 and the rotor housing 8 can be ensured. The positioning bin 23 is the positioning hole 5
a, and when the first cylinder and the second cylinder are assembled to the first eccentric shaft 28, and the first eccentric shaft 28 is inclined with respect to the horizontal line. Even if the position of the outer side housing 3 and the rotor housing 8 is shifted in the radial direction of the eccentric shaft with respect to the inner side housing 5, the outer side housing 3 and the rotor housing 8 are integrally shifted. The outer side housing 3 and the rotor housing 8 can be assembled to the inner side housing 5 using tension bolts, and the eccentric shaft can be rotated in the casing while the axis of the eccentric shaft is tilted obliquely. Be able to support.

Here, as shown in FIG. 7, the bearing of the fixed gear 43 is connected between the outer side housing 3 and the rotor housing 8 between the bearing 56 provided in the portion 43b and the second eccentric shaft 49. A filler 59 is provided to prevent the bearing 56 from coming into partial contact with the second eccentric shaft 49 when assembled to the second eccentric shaft 49. This filler 59 disappears during engine rotation and the bearing 56
and the second eccentric shaft 49, and a self-lubricating material is used for this filler 59. The outer peripheral surface of the second eccentric shaft 49 or the inner peripheral surface of the hair ring 56 is coated with molybdenum disulfide. The filler 59 has its second portion as shown in FIG.
They are provided at predetermined intervals in the axial direction of the eccentric shaft 49, and are provided at 120' symmetrical positions in the circumferential direction of the second eccentric shaft 49, as shown in FIG. , the part where the filler 59 is not provided between the bearing 56 and the second eccentric shaft 49 is worn out quickly in the early stage of engine rotation.
A clearance 60 between the bearing 56 and the bearing 56 ensures lubrication of the bearing. The second eccentric shaft 49 and the bearing 56 cause the filler 59 to disappear quickly.
This is because sufficient lubricating oil is quickly supplied to the oil clearance section 60 between the bearing and the bearing to ensure lubrication of the section.

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

■ In the embodiment, the eccentric shaft was explained as having a two-divided structure consisting of the first eccentric shaft and the second eccentric shaft, but the present invention is also applicable to a structure in which the eccentric shaft is one without being divided. It is possible.

(O) In the embodiment, a structure in which the eccentric shaft is rotatably supported at three locations on the casing has been described, but the present invention can also be applied to a structure in which the eccentric shaft is supported at four or more locations.

In the bB7 embodiment, the diameter of the end of the positioning pin facing the inner side housing is reduced and the pin is loosely fitted into the positioning hole formed in the inner side housing.
Instead of reducing the diameter of the positioning pin, the diameter of the positioning hole formed in the inner side housing may be made larger than the outer diameter of the positioning pin, and the positioning pin may be loosely fitted into the positioning hole.

←) In the embodiment, a single positioning pin extending from the outer side housing 3 to the inner side housing 5 is used. It is also possible to do this.

- [Phase] In the embodiment, the fillers 6 were provided at equal intervals in the oil clearance portion, but the filler material may be provided over the entire oil clearance portion instead of being provided partially like this.

(Effects of the Invention) As explained above, the present invention provides a filling material that disappears during engine rotation between a bearing concentric to a fixed gear and an eccentric shaft, so that the bearing is in one-sided contact with the eccentric shaft. This prevents wear caused by uneven contact of the eccentric shaft.

[Brief explanation of drawings]

FIG. 1 is an overall configuration 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 sectional view showing the detailed structure of the casing of the multi-cylinder rotary piston engine according to the present invention. 7. FIG. 6 is a sectional view taken along the line xx in FIG. 5. FIG. 7 is an enlarged view showing the detailed configuration of the end cylinder of the multi-cylinder rotary piston engine according to the present invention. FIG. 8 is a sectional view taken along the Y-Y line in FIG. 7. l...Multi-cylinder rotary piston engine body 2.3, fist outer side housing 4 to 6, inner side housing 6 to 8, rotor housing 9 to 11, working chamber 21-@locating pin 22...locating pin 23・・Positioning pin 33・・Rotor 34・Rerotor 280−1st eccentric shaft 41−−Fixed gear 42・−Fixed gear 43・−Fixed gear 49・e2nd eccentric shaft 54 units・Rotor 8 Procedural amendment (voluntary) October 31, 1980 Mr. Commissioner of the Japan Patent Office l Display of the case 1988 Patent Application No. 171264 2 Name of the invention Multi-cylinder rotary piston engine 3 Relationship to the person who makes corrections Patent applicant May 19, 1988 Date name (313) Mazda Motor Corporation Name changed (all at once) 4 agents 105 Address (508) 1801 Address 3-7-3 Shinbashi, Minato-ku, Tokyo, Midoriya 2nd Building drawings (Fig. 1,
(Figure 7) Contents of 6 amendments Figures 1 and 7 of the drawings will be revised as shown in the attached drawings.

Claims (1)

[Claims] (1) In a multi-cylinder rotary piston engine in which an eccentric shaft is rotatably supported in a casing via bearings at both end portions and an intermediate portion thereof. An outer side housing that constitutes a casing of one of the cylinders at both ends and is provided with an externally toothed fixed gear that meshes with an internally toothed gear of the rotor and a rotor housing of the cylinder are fixed to each other by a positioning pin, The rotor housing is positioned on the inner side housing by a positioning pin and attached to the outer side housing so that the rotor housing can move in the radial direction of the eccentric axis relative to the inner side housing of the cylinder. A multi-cylinder rotary piston engine characterized in that a filler that disappears during rotation of the eccentric shaft is provided between a bearing concentric with the gear and the eccentric shaft.