JPH0377375B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a cylinder case equipped with a reciprocating piston that is rotatably supported in a main body case, and an intake and exhaust port formed on an end face of the cylinder case that is connected to the main body. The present invention relates to a governor device used in an engine that is configured to communicate circulation with an exhaust hole and an intake hole formed in the end face of a head portion of a case.

[Conventional technology]

Generally, the mechanical governor device installed in the engine is
A governor weight is provided at the engine speed, and its centrifugal force (governor force) is transmitted to the control means via a link mechanism, so that a control amount can be obtained according to the equilibrium point between the elasticity of the governor spring and the governor force. There is.

[Problem that the invention seeks to solve]

In the conventional governor device described above, the linkage structure for transmitting the governor force to the control means is generally complex, and the linkage structure also occupies a large space.

The present invention aims to provide a governor device that is simple and compact in structure by effectively and rationally utilizing the engine configuration described above.

[Means for solving problems]

In the present invention to achieve the above object,
In the engine configured as described above, the governor weight is pivotally mounted in the recess formed in the end face of the cylinder case, and the rod that shifts or rotates in response to the centrifugal force of the governor weight is mounted on the cylinder rotation axis. A governor spring is applied to this rod in a direction opposing the centrifugal force, and the control means is operated by forward and reverse operation of the rod.

[Effect]

According to the above configuration, for example, when the control means performs fuel injection amount control, when the rotation of the cylinder case increases due to load reduction, the governor force overcomes the elasticity of the governor spring, and the rod moves to the fuel reduction side. Conversely, when the load increases and the rotation of the cylinder case decreases, the elasticity of the governor spring overcomes the governor force and the rod is operated to increase the amount of fuel, bringing the governor spring and governor force into equilibrium. Fuel reduction or increase control is performed until

〔Effect of the invention〕

The governor device according to the present invention is constructed and operates as described above, and thus exhibits the following effects.

There is no need for a rotating shaft for rotationally driving the governor weight, a gear for driving the governor weight, etc., and the structure for driving the governor weight can be simplified.

Since the governor weight is installed inside a part of the rotating cylinder case, there is no need for a dedicated space for installing the governor weight, which is effective in making the device more compact.

Since the governor force is taken out to the head section side via a rod provided on the rotation axis of the cylinder case, the structure can be easily linked with the control means installed in the head section.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on illustrative drawings.

FIG. 1 shows an overall longitudinal side view of the engine, and FIG. 2 shows its longitudinal front view. The main body case 1 of this engine has a two-part structure in which a front case 1a, which is the output side, and a rear case 1b, which is the head side, are bolted together. 3 is rotatably supported horizontally.

The cylinder case 3 includes the bearings 2,
It consists of front and rear cylindrical shaft cases 4, 5 supported by the cylinder shaft 2, and an intermediate case 6 sandwiched and connected between them.
A through-type cylinder 7 having an axis perpendicular to the rotation axis P of the cylinder case 3 is attached to the intermediate case 6.
is formed.

A pair of pistons 8 , 8 are fitted inside the cylinder 7 so as to face each other, and a steel ball (solid or hollow) 9 is rotatably attached to the skirt portion of each piston 8 via a partially spherical bearing metal 10 . and is supported by a stopper ring 11 to prevent it from coming off.

A cam plate 12 is fastened together between the front and rear cases 1a, 1b of the main body case 1, and the steel balls of the pistons 8, 8 are inserted into an oblong cam hole 13 formed in the center of the cam plate 12. 9 and 9 are inscribed, and each piston 8 reciprocates twice for each rotation of the cylinder case 3.

The rear end surface of the cylinder 7 is configured to be in sliding contact with the head portion 14 formed at the center of the rear case 1b in the direction of the cylinder case axis, and a single suction shaft eccentric to the cylinder case rotation axis P is provided on the rear end surface of the cylinder. An exhaust port 15 is formed. Further, an exhaust hole 16, an intake hole 17, and a fuel injection hole 18 are provided on the sliding surface of the head portion 14 with a predetermined angular phase along the moving direction of the intake and exhaust port 15, and the cylinder case 3 As the cylinder case 3 rotates, the intake/exhaust port 15 is sequentially communicated with the exhaust/intake holes 16, 17 and the injection hole 18 at appropriate timings, and four cycles of exhaust-intake-compression-explosion-expansion are performed.
is continuously rotated in a fixed direction A.

The rotational output of the cylinder 3 is then fitted into the pulley 19 attached to the outer end of the front cylinder shaft case 4 or into the shaft end spline hole 20.
It is adapted to be taken out from a PTO shaft (not shown).

Further, a fan 21 is attached to the shaft end of the cylinder shaft case 4 together with the output pulley 19, and the fan 21 is attached to the shaft end of the cylinder shaft case 4 so that the outside air taken in from an opening 22 formed at the center of the rear part of the rear cylinder shaft case 5 is distributed around the cylinder 7. After the cooling air passes through the cooling air passage 24 formed between the ribs 23, it is sucked and discharged from the exhaust port 25 provided on the front end circumference of the front cylinder shaft case 4, and is discharged from the head portion 14 and the cylinder 7.
It is configured to provide cooling.

The exhaust hole 1 is provided on the outer side of the head portion 14.
A muffler 26 that communicates with the intake hole 6 and an air cleaner 27 that communicates with the intake hole 17 are connected to each other, and a fuel inlet 28 that is connected via piping to a fuel tank (not shown) is provided. is connected to a fuel injection device described below.

Details of the fuel injection system are shown in FIG.

That is, a plunger type pump casing 29 is embedded and fixed inside the head portion 14, and the injection hole 18 is formed at the tip thereof. A plunger 32 is fitted into the pump casing 29 and is driven forward and backward by a rocker arm 30 and urged back and forth by a spring 31. A group of small holes 34 that are opened when the plunger 32 is retracted are formed around the circumference of the plunger chamber 33 formed in the pump casing 29. It is connected to the air intake hole 17 in communication.

A fuel control valve 37 whose opening degree is adjusted is provided in the intake system passage 36. The fuel control valve 37 includes a fixed sleeve 38 located on the rotational axis P of the cylinder case 3 and embedded in the head 14, and a tapered needle that moves back and forth along the axis P with respect to the fixed sleeve 38. 39, the fuel inlet 28 communicates with the inside of the sleeve 38 via a flow path 40, an annular groove 41, and a communication hole 42, and a gap between the sleeve 38 and the needle 39 is opened by moving the needle 39 back and forth. By adjusting the temperature, the amount of fuel flowing into the passage 36 of the intake system is adjusted.

The needle 39 is configured to be controlled to advance and retreat by a mechanical governor. This governor is
A governor spring 43 that presses the needle 39 in a direction that increases the opening degree of the control valve 37, and a governor weight 4 that generates a governor force that presses the needle 39 in a direction that decreases the opening degree of the control valve 37.
4, and is configured to be able to set the speed by adjusting the forward and backward movement of a spring receiving rod 45 that receives the rear end of the governor spring 43 using a speed regulating arm 46. The speed regulating arm 46 is linked to a speed regulating lever (not shown) via a release wire 47.

The governor weight 44 is attached to the cylinder case 3
It is housed in a recess 48 formed eccentrically with respect to the rotation axis P at the rear end, and is pivotably supported on a bracket 49 screwed and fixed to the cylinder case 3. An arm 44a connected from the governor weight 44 is brought into contact with the tip of a push rod 39a connected from the needle 39, so that the centrifugal force (governor force) of the governor weight 44 is transmitted to the needle 39. .

The rocker arm 30 for driving the plunger is supported by a ball fulcrum 51 formed integrally with the head cover 50, and one end of the arm 51 is connected to the push rod 5.
2 to one end of the bell crank 53,
Furthermore, the other end of this bell crank 53 is provided with a ball 5 on the outer periphery of a cam 54 which is integrally formed with the rear cylinder shaft case 5.
5, and the plunger 32 is driven to reciprocate once for each rotation of the cylinder case 3. The tip of the rocker arm 30 on the plunger side is engaged in a recess 57 of an abutment piece 56 that is driven and fixed to the rear end of the plunger 32, thereby preventing the rocker arm 30 from swinging laterally.

The engine according to the present invention is constructed as described above, and its operation will be explained next.

The cylinder case 3 is rotated clockwise in FIG. 5, and the intake/exhaust port 15 overlaps the exhaust port 16, and both pistons 8, 8 move toward each other to perform exhaustion, and then the intake/exhaust port 15 overlaps with the exhaust port 16. The exhaust port 15 overlaps with the intake hole 17, and both pistons 8, 8 move away from each other due to centrifugal force, so that the cylinder 7
Air is taken into the engine and continues into the intake compression stroke.

Then, the plunger 32 is driven backward once until the intake compression stroke ends, and air is rapidly sucked into the plunger chamber 33 by the retreat of the plunger 32 via the spring 31, and at this time air is generated in the passage 36. Fuel is sucked from the control valve 37 by the negative pressure generated, and is atomized and mixed with the air. The air-fuel mixture thus formed is transferred to the small hole 34.
The fuel flows into the plunger chamber 33 via the group, and atomization of the fuel is further promoted at this time. Then, due to the forced advance of the plunger 32, a certain amount of the air-fuel mixture in the plunger chamber 33 is compressed and becomes a high-pressure, high-temperature air-fuel mixture.

After this air-fuel mixture compression is completed, the intake/exhaust port 15 of the cylinder case 3, which has completed the intake compression stroke, is connected to the injection hole 1.
8, the high-pressure, high-temperature air-fuel mixture in the plunger chamber 33 is ejected into the high-temperature compressed air in the cylinder 7, and the explosion and expansion stroke begins. During this explosion and expansion stroke, the plunger 32 is held at the final advance (compression) position, and the combustion gas is maintained in a state where it is prevented from flowing into the plunger chamber 33.

Then, following the explosion and expansion stroke, the engine moves to the exhaust stroke, and this cycle is repeated thereafter.

The intake/exhaust port 15 and the head portion 1 when the cylinder 7 is in the intake compression stroke and the explosion expansion stroke.
4, a thrust ring 59 with a seal ring 58 is fitted into the edge step of the intake/exhaust port 15, and the internal pressure of the cylinder 7 is transferred to the front gap 60 of the thrust ring 59. The thrust ring 59 is brought into close contact with the head portion 14 by acting on the thrust ring 59.

Further, on the end surface of the head portion 14, the air intake/exhaust port 1 is provided.
An annular groove 61 is formed to collect gas leaking from the groove 6, and a part of the groove 61 is communicated with the intake hole 17 via a passage 62.
The cylinder 7 is configured to return the gas recovered in the cylinder 1 to the cylinder 7 together with the intake air.

Incidentally, lubricating oil is stored in the main body case 1 to lubricate various sliding and rolling parts.

[Another embodiment] As the fuel control means, a general fuel injection pump having an injection amount adjustment function may be used.
Also, in an electroplated engine, this corresponds to the carburetor.

As a control means operated by the rod 39a,
The fuel injection timing may be controlled by changing the position of the fuel injection hole 18 around the cylinder rotation axis P.

It is also possible to operate the control means by rotating the rod 39a in forward and reverse directions.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of an engine according to the present invention;
Figure 2 is a longitudinal front view, Figure 3 is an enlarged sectional view of the fuel injection device, Figure 4 is a front view from the head side,
FIG. 5 is a front view of the head portion taken longitudinally. 1...Body case, 3...Cylinder case, 8
...Piston, 14...Head part, 15...Intake/exhaust port, 16...Exhaust port, 17...Intake port, 37...
...Control means, 39a...Rod, 44...Governor weight, 48...Recess.

Claims (1)

[Scope of Claims] 1. A cylinder case 3 equipped with a reciprocating piston 8 is rotatably supported on the main body case 1, and an intake/exhaust port 15 formed on the end face of the cylinder case 3 is connected to a head portion 14 of the main body case 1. In this engine, a governor weight 44 is pivotally mounted in a recess 48 formed in the end surface of the cylinder case 3, and the governor weight 44 is connected to the exhaust hole 16 and the intake hole 17 formed in the end surface of the cylinder case 3. A rod 39a that shifts or rotates in response to centrifugal force is installed on the cylinder rotation axis P, and a governor spring 43 is applied to the rod 39a in a direction that opposes the centrifugal force.
An engine governor device configured to operate the control means 37 by forward and reverse operation of the engine 9a. 2. The governor device according to claim 1, wherein the control means 37 controls the fuel injection amount. 3. The governor device according to claim 1, wherein the control means 37 controls fuel injection timing.