JPS61157724A - Internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce a side pressure and improve a sealing characteristic, by constituting an engine such that a cylindrical cam, forming in its upper end a cam surface and rotating with a center shaft, engages a piston in an upper end peripheral edge of the cam and rotates in a peripheral direction by pressing force of the piston. CONSTITUTION:A cylindrical cam 2, being arranged surrounding a center shaft (rotary shaft) 1, is integrally rotated with the center shaft 1. The cylindrical cam 2 is constituted by forming in two places of its upper end peripheral edge a cam surface comprising a tilt part 2b, descending at a suitable angle from an upper end part 2a, and a rise-up part 2d rising from a tilt bottom end 2c of the part 2b. And an engine, providing two pistons 3 having a groove 4 so as to hold the peripheral edge of said cylindrical cam 2 and riding it, provides in each piston 3 an upper and a bottom roller 5, 6 so as to hold the tilt part 2b from the upper and the bottom. The engine, fitting each piston 3 into a cylinder chamber 8a provided in a cylinder 8 in a fixed side, rotates the cylindrical cam 2, that is, the center shaft 1 by pressing force of said piston 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 4-NiC internal combustion engine, and particularly to an internal combustion engine with low C side pressure and excellent sealing performance.

[Conventional technology]

This is a well-known 4-Nikle internal combustion engine.

A piston type is used, in which the piston is reciprocated by crank motion, and a rotor type, in which a ball-shaped rotor is eccentrically rotated within a case, is used.

[Problems to be solved by the present invention]

These conventional internal combustion engines each have their own advantages and are widely used in various fields, but the former has a theoretical disadvantage in that lateral pressure acts on the piston, resulting in an output loss corresponding to that amount.

Also, in the latter case, the seal between the rotor and the case is insufficient,
This causes output loss.

(Nipiston type has a complicated rank mechanism.

Since it requires a power mechanism and a valve mechanism and also employs a valve sling mechanism, it has the drawback of poor intake and exhaust flow and relatively low combustion efficiency.

In addition, the case and rotor are difficult to manufacture for the latter.

However, the above-mentioned seal structure also has the disadvantage of being complicated.

Furthermore, there is a drawback that the Nycl ratio of the conjugate exhaust cannot be freely changed.

The present invention was devised to solve the above-mentioned drawbacks, etc., and its purpose is to reduce side pressure, smooth the flow of intake and exhaust air, and increase combustion efficiency.
(To provide an internal combustion engine that can be formed compactly)
There are two.

[Means for solving problems]

In order to achieve the above object, the present invention surrounds a central axis,
It rotates together with this, and at an appropriate angle from the periphery and end face.
4, and the upper end r rising from the end of this slope.
A cylindrical cam formed by forming a cam surface having a rising portion that returns to M, and the periphery of the cylindrical cam are sandwiched and straddled.

A cylinder C on the immovable side has a piston supported so as to be freely movable; a roller disposed to suppress the piston at the circumference C of the cylindrical cam; When freely supported, the cylinder head has an intake and exhaust passage formed therein, a boat formed in the cylinder 4 and which communicates the intake and exhaust passage with the inside of the cylinder, and a boat along the cylindrical cam. A piston C is disposed at the lower end of the slanted cam of the cylindrical cam.

An internal combustion engine comprising a lifting member, and a moving means disposed between the central shaft and the lifting member C2 and moving the lifting member toward the top dead center of the piston in synchronization with the movement of the piston. That is.

[For production]

In the present invention, a cylindrical cam rotating together with a central shaft is moved in the circumferential direction by the pressing force of a piston to obtain rotational force of the central shaft. The push-up member is a protrusion formed on the periphery and functions to push up the piston in synchronization with the rotation of the central shaft.

It enables various operations such as gas, compression, combustion, and exhaust. The rotary valve has a simple mechanism that allows intake and exhaust to be performed in synchronization with the rotation of the central shaft, and has a high function to stabilize the intake and exhaust flow.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

First, some of the main parts of this embodiment will be explained in an easy-to-understand manner with reference to FIG.

A cylindrical cam 2 is disposed surrounding a central axis 1 (rotating axis). The cylindrical cam 2 rotates together with the central shaft 1. Cylindrical cam 2
A cam surface is formed around the periphery.

This cam surface has an inclined portion 2b at an appropriate angle from the upper end 2a.
It is formed from rising portions 2d rising from the slope end 2o, and in the case of FIG. 1, 211 portions are formed. (Therefore, two pistons 3 may be provided).

The piston 3 forms a groove 4 which opens at one end side C2.

As shown in the figure, the cylindrical cam 2 is disposed so as to sandwich the periphery of the cam 2 and straddle the a4. Also, as will be explained in detail later, the piston 3 is
is pressed against the peripheral edge C2 of the cylindrical cam 2, and is disposed so as to be able to move up and down along the end surface 2a, force surface 2b, etc.

As shown in FIGS. 2 and 3, the central boss portion 2e of the cylindrical cam 2 is fixed to the central shaft 1 by a key 7, and the cam surface 2b etc. are formed on the peripheral edge C2 of the cylindrical cam 2 as described above.

Note that the upper end surface 2a, cam surface 2b, etc. are narrow portions 2f as shown in the figure.
1: Supported and a service letter 12 is formed.

The piston 3 is disposed astride the cylindrical cam 2 as described above, and the upper roller 5 and the F-lower 76 are pivotally supported at the upper and lower portions C2 of the piston 3 that sandwich the upper end surface 2a, cam surface 2b, etc. of the cylindrical cam 2.

Further, a recess 3a forming a part of the combustion chamber is formed at the upper end of the piston 3.

A cylinder chamber 8a that slidably supports the piston 3 is formed in the cylinder 8 on the immovable side, and a case 9 surrounding the cylindrical cam 2 is fixed to the lower side of the cylinder chamber 8a. Further, the cylinder 8 is formed with a circumferential groove (not shown) through which the cylindrical cam 2 can pass. A cylinder 8 and a case 9 integrally constructed therewith; second, the central shaft 1 is rotatably supported via bearings 10 and 11, and the central shaft 1 is supported by a thrust bearing 12;
It is thrust supported by a nut 13 via. Further, the cylindrical cam 2 is also supported by the case 9C by the thrust bearing 14. The upper side of the cylinder 8 (: indicates a slide plate for a rotary valve 15 fixed to the central shaft 1) is rotatably supported via a cylinder 16. Note that the joint surface of the rotary valve 15 with the cylinder 8 is formed into a tapered shape to improve contact performance. As shown in FIG. 4, the rotary valve 151 is provided with an intake passage 17 and an exhaust passage 18, and the intake passage $1
7 is a two-connection T (on the carburetor side (not shown) via a damper 19 etc.)
Ru.

Further, the exhaust passage 18 communicates with an exhaust pipe 20.

Note that since the carburetor and exhaust pipe 20 are located on the immovable side, they are connected to the intake passage 17 and the exhaust passage 18 via a seal member (not shown) or the like.

Prevents leakage of gas, etc. Further, the cylinder 8C is formed with a boat 21 (shown in FIGS. 2 and 4) that communicates the cylinder chamber 8a with the joint surface of the rotary valve 15. Therefore, the port 21 has an intake passage 1 which is rotationally positioned.
7 and exhaust passage 18 are in synchronous communication. Further, a plug mounting hole 22 (not shown) is formed in the cylinder head 8b6=.

Franc for rotary valve 15! >23 is advance angle adjustment port 2
4, and the flange 23 is fixed to the central shaft 1 via a key 25.

Therefore, the relative positional relationship between the center shaft 1 and the rotary valve 15 can be moved, and the advance angle adjustment is thereby performed.

As shown in FIG. 2, the push-up member 26 is formed from an arcuate plate member that extends along the inner peripheral surface of the cylindrical cam 2.

On its upper periphery is a shoulder-width protrusion 28a as shown in Figure 5I.
is formed. The protrusion 26a has a cam surface of the cylindrical cam 2.
In the case of locations, C2 is formed at two locations on the circumference in alignment with the cam surface 2a, etc. Note that, as shown in FIG.
The piston 3 is formed so as to pass through the first groove 27 (FIG. 5) and come into contact with the upper roller 5, so that the piston 3 can be pushed upward in the figure. In addition, Fig. 6 and Fig. 7)
As shown in 2, the cam surface 2b of the cylindrical cam 2, etc. (: indicates the protrusion 26
A second groove 28 is formed to prevent interference with a.

As shown in FIGS. 2 and 5, the push-up member 26 (:) has a square hole 29 recessed therein, and a bottle 31 of a moving means 30 (to be described later) is inserted into this square hole 29C via a square medal 32. Note that a gap 33 is formed between the square medal 32 and the square hole 29.

Next: The second moving means 30 will be explained.

As shown in FIG. 2, a bevel gear 34 is pivotally supported on the central boss portion 2e of the cylindrical cam 2, and the bevel gear 34 meshes with a fixed bevel gear 35 on the cylinder 8 side. 35, half the number of teeth C2 is formed. Therefore, when the central shaft rotates half a rotation, the bevel gear 34
The half 31 is similarly inserted into the square medal 32 as described above. The amount of eccentricity of the bottle 31 is set to an appropriate amount that can push the piston 3 up to near the top dead center when the piston 3 is pushed up for compression and exhaust.

The above-mentioned moving means 3 (position C in which the push-up member 26 connected to H2 is synchronized with the cam surface 2b etc. of the cylindrical cam 2; from the arrangement C2, the piston 3 is the cam surface 21 of the cylindrical cam 2),
During the compression and exhaust strokes, the push-up member 261 = therefore actively deformed.
It is formed to be pushed up.

As shown in FIG. 2, a thrust receiver 36 is provided on the outer periphery of the cylindrical cam 2 and within the inner periphery of the gauge 9.

During the combustion process, the slant force acting on the C2 cylindrical cam 2c is maintained. The thrust receiver 3% 36 is pivotally supported on the cylindrical cam 2 side C;

Next, the operation of the second embodiment will be explained.

When the central shaft 1 rotates, a cylindrical cam 2 fixed thereto rotates. As mentioned above, the piston 3 is connected to the upper roller 5 and F.
Cam surfaces 2b, 2o, 2dl of cylindrical cam 2 via roller 6
:To touch, go back and forth along this line.

In other words, it inhales and compresses at a rate of approximately 1/4 rotation.

Repeating each process of combustion and exhaust is C2. piston 3
When C2 moves to the compression and exhaust process C; the pin 31 of the bevel gear 34 moves to the upper side C; as shown in FIG.
As a result of this C2, the push-up member 26 is lifted, and the protrusion 26a contacts the upper roller 5, moving the piston 3 toward the top dead center (
Lift it up with Nipiston 3 and move it. On the other hand, during the combustion and suction process C2, as shown in FIG. 7C2, the bevel gear 34's beam 31 is pushed downward, and the push-up member 2b is separated from the upper roller 5 and moves downward.

On the other hand, the one-turn valve 15 rotates to align the intake passage 17 or the exhaust passage 18 with the boat 21 (the boat 21), and a predetermined intake or exhaust is performed.Of course.

During the pressure testing and combustion process, the boat 21 is connected to the rotary valve 15.
C: More closed. The slide plate 16 brings the rotary valve 15 and cylinder 8 into close contact to prevent gas leakage.

Combustion takes place in the recess 3a of the piston 3 through ignition C of a plug (not shown), ensuring good combustion. As mentioned above, since the piston 3 is in pressure contact with the cylindrical cam 2C at a substantially right angle to the inclined portion 2bl and reciprocated up and down, almost no lateral pressure acts on it, and the output loss due to this is large and low. Further, when a large pressure is applied during an explosion, the thrust at 1: is held by the thrust receiver R36C as described above, so there is no problem.

Also, since the piston type reciprocates, it has excellent sealability compared to the rotor type. In addition, the valves for opening and closing the intake and exhaust air are not complicated as in the case of a piston type, and no valve springs are used, and as described above, by forming the recess 3a, a good airflow can be obtained and efficiency is improved.

Furthermore, the relative position of the cylindrical force 1m2 with respect to the second piston 3 can be easily changed by operating the advance angle adjustment bolt 24, and the timing of intake and exhaust can also be easily changed by the advance angle adjustment bolt 24. .

Also, changing the shape of the cam surface 2b of the cylindrical cam 2):
Since the Nycle ratio can be set more freely, sufficient intake and exhaust can be achieved.

Figure 8 shows the arrangement of the bevel gears 34, etc. in the case of a three-cylinder engine.The bevel gears 34 are arranged radially, and each bevel gear 34 may be the same regardless of whether it engages with the push-up member 26'c, but the rotating balloon whistle intake The passage 17, the exhaust passage 1B, and the boat 21 may be changed depending on the number of cylinders C2.

In addition, this embodiment does not have a crank shut, camshaft, connecting rod, valve spring, etc., and is small in size, particularly in the height direction. Moreover, it is formed into a cylindrical shape, making it compact.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention C2,
Combustion efficiency is improved, and the effect of being relatively small and compact is increased.

[Brief explanation of drawings]

FIG. 1 is an explanatory perspective view showing the general structure of the main part of an embodiment of the present invention, FIG. 2 is an axial sectional view of the embodiment, and FIG.
FIG. 4 is an explanatory view showing the state of engagement between the piston and the cylindrical cam, as seen from the direction of arrow I in the figure, and FIG. 4 is a plan view showing the intake and exhaust passages of the rotary valve. FIG. 5 is a partially developed front view of the push-up member, and FIGS. 6 and 7 are explanatory diagrams showing the operation of the push-up member. FIG. 8 is a plan view showing the arrangement of bevel gears, etc. in the case of three cylinders. 1... Central shaft 2.2'... Cylindrical cam 2a.
...Top end surface 2b...Slanted portion 2...Slanted end 2d...Rising portions 2e, 2e'...Central boss portion 3...Piston 3a...Recessed portion 4... fit
s...Upper roller 6...R roller 7, 25...Key 8...Cylinder
8a...Cylinder chamber 8b...Cylinder head 9
...Case 10.11...Bearing 12.14...
・Thrust bearing 13...Nut 15...Rotary valve 16...Slide plate 17...Intake passage 18...Exhaust passage 19...
・Damper 20...Exhaust pipe 21...Port
22...Plug mounting hole 23...Flange 24...Advance angle adjustment bolt 26.26'...Pushing member 26a...Protrusion 27...First groove 28...
・Second groove 29...Square hole 30...Moving means
31... Bin 32... Square medal 33...
・Gap 34.35...Bevel gear 36...Slant receiver Fig. 2 Fig. 3 Fig. 4 Fig. 8 Procedure Ne City correct f! IF4 direction illusion

Claims (5)

[Claims] (1) Forming a cam surface that surrounds and rotates with the central axis and has an inclined part that descends at an appropriate angle from the upper end surface of the periphery, and a rising part that rises from the end of this inclined part and returns to the upper end surface. a cylindrical cam, a piston sandwiching and straddling the periphery of the cylindrical cam and slidably supported by the immovable cylinder; and a piston arranged to press the piston against the periphery of the cylindrical cam. a rotary valve that rotates with the central axis and is rotatably supported around the cylinder by the cylinder and has intake and exhaust passages formed therein; a port that communicates with the interior of the cylindrical cam; a push-up member that is arranged along the cylindrical cam and is arranged to abut the piston located near the inclined lower end of the cylindrical cam; An internal combustion engine comprising: a moving means that engages with the member and moves the push-up member near the top dead center side of the piston in synchronization with the movement of the piston. (2) The internal combustion engine according to claim 1, characterized in that a thrust receiver is interposed between the outer periphery of the cylindrical cam and the immovable side thereof and is disposed substantially perpendicular to the moving direction of the piston. . (3) The internal combustion engine according to claim 1 or 2, characterized in that a combustion chamber recessed in the head of the piston is formed. (4) The internal combustion engine according to any one of claims 1 to 3, wherein the cylinder having the above configuration is formed from a multi-cylinder cylinder. (5) In the multi-cylinder internal combustion engine set forth in item 4 above, the rotary valve has a disc shape that rotates simultaneously with the central axis, and the intake passage 1
5. The internal combustion engine according to claim 4, wherein the internal combustion engine is provided with one exhaust passage and one exhaust passage so that intake and exhaust are performed simultaneously.