JPH0322483Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention comprises at least three cylinders arranged in series and an eccentric shaft common to these cylinders that is arranged passing through the cylinders. This invention relates to an engine mount structure for an automotive rotary engine.

(Prior Art) As a multi-cylinder rotary piston engine having at least three or more cylinders each housing a rotor therein, there is known, for example, one described in Japanese Utility Model Publication No. 14723/1983. The disclosed multi-cylinder rotary piston engine is a so-called three-rotor type rotary piston engine consisting of three cylinders arranged in series,
It has a single rotor eccentric shaft extending through each cylinder. Each cylinder has a substantially triangular rotor arranged in a space defined by a side housing and a rotor housing so as to form an operating chamber, and a rotor bearing portion formed at a position corresponding to the rotor on an eccentric shaft is used to generate a rotor. It is constructed by supporting the Inside each cylinder, the rotor rotates while slidingly contacting the inner peripheral surface of the rotor housing at the apex and changing the volume of the working chamber. The process is starting to take place.
In such a multi-cylinder engine having three or more cylinders, the eccentric shaft is supported at three or more points by the side housings on both ends and the intermediate side housing. The contact pressure of the bearing portion is not uniform, resulting in problems such as uneven wear of the bearing and increased vibration of the eccentric shaft. In order to solve this problem, after making the rotor housing of the end cylinder movable in the radial direction of the eccentric shaft relative to the inner side housing and positioning the housing so that the contact pressure of each bearing part is equal, A fixed multi-cylinder rotary piston engine has been proposed in Japanese Patent Application Laid-Open No. 60-69209.

(Problems to be solved) Also, the structure proposed in Utility Model Application Publication No. 60-69209,
In general, engine mount structures are required to have sufficient strength because they need to support a large engine weight and suppress engine vibrations as much as possible. In this case, the mounting member of the rotary piston has conventionally been attached to a side housing that is stronger than the rotor housing due to the above-mentioned requirement for strength.

(Problem to be solved) However, the casing of a rotary piston engine is constructed by stacking a plurality of side housings and rotor housings alternately in the axial direction of the output shaft according to the number of cylinders. There is a limit to the width of the side housing to which the member is attached, making it difficult to ensure a sufficient size of the attachment portion of the mount member, and as a result, there is a risk that sufficient strength of the engine mount structure may not be obtained. Particularly in a rotary engine having three or more cylinders, the weight of the engine increases, so the problem of ensuring the strength of the engine mount member becomes serious. Furthermore, JP-A-60-69209
In the structure proposed in the above issue, the side housing at one end is configured to be movable in the radial direction, so in terms of installation strength, the mount member must be installed avoiding this side housing. There are also restrictions.

(Means for solving the above problems) The present invention is constructed in view of the above circumstances, and the rotary piston engine for automobiles of the present invention includes at least three cylinders arranged in parallel,
an eccentric shaft common to each cylinder extending through these cylinders, and a radius of the eccentric shaft is provided between the cylinder rotor housing at either end and the inner side housing, that is, the intermediate side housing to which the housing is joined. Positioning can be performed by slightly moving in the direction.

Further, the eccentric shaft is composed of a first eccentric shaft and a second eccentric shaft each having at least one eccentric bearing portion for supporting the rotor, and the second eccentric shaft is fitted into the first eccentric shaft in the axial direction. By doing so, the eccentric shaft is joined and has an integral structure. Furthermore, a joint portion between the first eccentric shaft and the second eccentric shaft is housed in the inner side housing.
An engine mount member is attached to the inner side housing. Preferably, the other end of the engine mount member is attached to a vehicle body or a differential gear case disposed below the engine via an elastic member.

(Effects of the present invention) According to the present invention, the engine mount member is
It is designed to be attached to the inner side housing of a multi-cylinder rotary piston engine. This inner side housing is provided with a bearing that supports the eccentric shaft, and is designed to accommodate the joint between the first eccentric shaft and the second eccentric shaft, so it is wider than the other side housings. It is composed of It also has sufficient strength compared to the rotor housing. Therefore, the engine mount member can be securely mounted with sufficient mounting position,
Thereby, a predetermined strength of the engine mount structure can be ensured.

(Description of Embodiments) Hereinafter, embodiments in which the present invention is applied to a three-cylinder rotary piston engine will be described with reference to the drawings.

FIG. 1 shows a sectional view of an engine according to an embodiment of the present invention.

A three-cylinder rotary piston engine 1 includes three cylinders arranged side by side and an eccentric shaft 2 extending through these cylinders, and a flywheel is attached to one end of the eccentric shaft 2. A balance wheel 3a is attached to the other end of the eccentric shaft 2 to reduce vibrations of the eccentric shaft 2. The first cylinder, that is, the cylinder on the flywheel side, is configured using an end side housing 4, a rotor housing 5, an intermediate side housing 6, and a rotor 7 as basic elements. The rotor 7 is arranged to form a working chamber 8 in a space defined by the housings 4, 5, and 6, and rotates within this space while changing the volume of the working chamber to perform intake, compression, and The explosion and exhaust steps are carried out. In this case, the side housings 4 and 6 form side walls of a space in which the rotor 7 rotates, and the rotor housing 5 forms a peripheral wall of the space. Further, the second cylinder, that is, the intermediate cylinder, is configured in the same manner as the first cylinder with basic elements including an intermediate side housing 6, a rotor housing 9, an intermediate side housing 10, and a rotor 11, and the rotor 11 forms a working chamber 12. It is arranged like this. Furthermore, the third cylinder, that is, the balance foil side cylinder, is configured in the same manner as the first and second cylinders, with the intermediate side housing 10, the rotor housing 13, the end side housing 14, and the rotor 15 as basic elements. are arranged to form a working chamber 16.

Therefore, in the configuration of this example, the intermediate side housing 6 and the intermediate side housing 10, which constitute the side wall of the rotor rotation space, are connected to the first cylinder and the second cylinder, respectively.
It is a common component of the cylinder, the second cylinder, and the third cylinder. Above housing 4, 5, 6, 9, 1
0, 13, and 14 are positioned with respect to each other by positioning pins 17, 18, and 19, and are tightened by tension bolts 20 arranged at predetermined intervals around the rotor rotation space, as shown in FIG. This creates an integrated rotor casing.

Further, as shown in FIGS. 2 and 3, the positioning pin 23 of the third cylinder is located at the intermediate side housing 1.
0, the end side housing 14 and the rotor housing 13
can be moved slightly in the radial direction of the eccentric shaft 2 during positioning, and the eccentric shaft 2 has a
It is designed so that assembly can be performed after adjustment so that eccentric force is not applied.

A cooling water passage 20a is formed in the casing assembled in this way so that engine cooling water can circulate through each part of the casing. Further, as exemplarily shown in FIG. 2, the side housing 10 is formed with an intake port 14a.

Further, as shown in detail in FIG. 2, a leg portion 10b projecting laterally is formed at the lower part of the intermediate side housing 10, and an engine mount bracket 51 is attached to this leg portion 10b with a bolt 50. Installed. The engine mount bracket 51 is fixed to the vehicle body 53 via an elastic member, ie, a mount bar 52, so that the engine 1 is supported by the vehicle body 53. Furthermore, a reinforcing plate 54 is fixed to the bottom of the side housing 10.
The reinforcing plate 54 extends to cover the casing in the direction in which the eccentric shaft 2 extends, and serves to increase the integral rigidity of the casing.

The eccentric shaft 2 connects rotors 7, 11, 1 via bearings 21, 22, 23 at positions corresponding to each cylinder.
Eccentric bearing parts 24, 25, which rotatably support 5.
26, and a bearing 2 is attached to the rotor casing which is integrally formed with the housing.
3 rotatably supported via 7, 28, 29
It has three bearing parts 30, 31, and 32. In this case, the eccentric shaft 2 is supported by a fixed gear 34 fixed to the end side housing 4 by bolts 33 at the flywheel side end, and by a fixed gear 34 fixed to the intermediate side housing 10 by bolts 35 at the middle part. 36, and the end side housing 14 at the balance foil side end.
It is supported by a fixed gear 38 fixed by a bolt 37 to. These fixed gears 34, 36, and 38 function as bearing members for the eccentric shaft 2, and also have external teeth 34a, 36a, and 38, respectively.
38a, and these teeth 34a, 36
a, 38a are adapted to mesh with rotor gears 39, 40, 41 provided as internal gears on the rotors 11, 15, respectively.

Due to assembly problems, the eccentric shaft 2 is constructed by integrally joining two members, namely, a first eccentric shaft 42 and a second eccentric shaft 43. In this example, the flywheel 3 is attached to the end of the first eccentric shaft 42, and the first cylinder and the second
The rotor 7 is located at a position corresponding to the position corresponding to the cylinder.
Eccentric bearing parts 24 and 25 for supporting 11
and a bearing section 3 supported by the housings 4 and 10.
0,31 are provided. On the other hand, the second eccentric shaft 43 is provided with an eccentric bearing portion 26 that supports the rotor 15, and a bearing portion 32 that is supported by the housing 14. Referring also to FIG. 4, the first eccentric shaft 42 has a tapered portion 42a whose shaft diameter gradually decreases toward the balance foil side of the bearing portion 31.
It also has a small diameter portion 42b that extends to the balance foil side continuously from the taper 42a. This small diameter portion 42b is located at the end housing 1.
4, and has a threaded portion 42 at the tip.
c is provided. If FIG. 5 is also referred to, the second eccentric shaft 43 is configured as a tubular body having a through hole 43a, and the flywheel side end thereof has a tapered portion 42a of the first eccentric shaft 42. A tapered hole 43 having a complementary shape is formed therein. The second eccentric shaft 43 is adapted to fit into the small diameter portion 42b of the first eccentric shaft 42 in the through hole 43a. Further, the balance wheel 3a, the accessory drive gears 44, 45, and the pressure contact member 46 are fitted into the small diameter portion 42b of the first eccentric shaft 42 on the end side of the second eccentric shaft 43, respectively. ing. The threaded portion 4 at the end of the first eccentric shaft 42
A bag nut 46b is screwed into the nut 2c, and as the nut is screwed in, it engages with the stepped portion 46a of the pressure contact member 46, and the nut 46b
Press to the right in Fig. 1. As a result, the second eccentric shaft 43 is connected to the auxiliary drive gears 44, 4.
5 and the balance foil 3a, and comes into pressure contact with the tapered portion 42a of the first eccentric shaft 42 in the tapered hole 43b. As a result, the first eccentric shaft 42 and the second eccentric shaft 43 are integrally coupled to form the eccentric shaft 2. In this case, the relative movement of the second eccentric shaft 43 corresponding to the first eccentric shaft 42, the balance foil 3a, the gears 44, 45, and the pressure contact member 46 is prevented by the pin 47 inserted in the axial direction. It's getting old.

In the rotary piston engine 1 of this example, the engine components are sequentially assembled to the first eccentric shaft starting from the first cylinder, and the intermediate side housing 10 of the second cylinder is assembled to the first eccentric shaft 42. , the second eccentric shaft 43 is fitted to the first eccentric shaft, and then the components of the third cylinder, the balance wheel 3a, etc. are assembled for final assembly. In the structure of this example, the engine mount bracket 51
is attached to the middle side housing 10, which is the widest and has the highest strength, so the bracket 51
The mounting portion of the engine mount can be sufficiently wide and firmly mounted, and therefore, an engine mount structure having desired strength can be obtained. Note that the other end of the mount bracket 51 can be attached not only to the vehicle body but also to a differential gear case if it is disposed below the engine 1.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of a multi-cylinder rotary piston engine according to an embodiment of the present invention, and FIG.
FIG. 3 is a partial sectional view of the engine in FIG. 1, FIG. 4 is a partial sectional view of the first eccentric shaft, and FIG. 5 is a partial sectional view of the second eccentric shaft. FIG. 1...Rotary piston engine, 2...Eccentric shaft,
3...Flywheel, 3a...Balance wheel,
4, 14... End side housing, 5, 9, 13
... Rotor housing, 6, 11... Intermediate side housing, 7, 11, 15... Rotor, 24, 25,
26... Eccentric bearing part, 30, 31, 32... Bearing part,
34, 36, 38...Fixed gear, 39, 40, 41
...Rotor gear, 42...First eccentric shaft, 43...Second eccentric shaft, 47...Key, 51...Mount bracket,
52...Mount rubber.

Claims (1)

[Scope of utility model registration request] an inner side housing to which the rotor housing of either end cylinder is joined, comprising at least three cylinders arranged side by side and an eccentric shaft common to each cylinder extending through the cylinders; The eccentric shafts can be positioned by slightly moving the eccentric shafts in the radial direction, and the eccentric shafts are first eccentric shafts each having at least one eccentric bearing portion for supporting a rotor. and a second eccentric shaft, the second
The eccentric shaft is joined to the first eccentric shaft by fitting in the axial direction to form the integral eccentric shaft, and the joint portion with the first eccentric shaft and the second eccentric shaft is connected to the inner side housing. A rotary piston engine for an automobile housed in the rotary piston engine for an automobile, characterized in that an engine mount member is attached to the inner side housing.