JPS6145342Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electric ignition device for a four-stroke engine, and the ignition timing setting shaft and its surrounding structure are made common to the fuel injection camshaft and its surrounding structure of a diesel engine, thereby improving mass production. The purpose of this invention is to prevent the performance of the electric ignition system from deteriorating due to the influence of lubricating oil in the engine.

In order to achieve the above object, the present invention provides an ignition timing setting shaft that is common to the camshaft of a diesel engine in the governor device chamber, and an electric ignition device is mounted on the rotating surface of the rotor provided at the tip of this ignition timing setting shaft. The electric ignition device is installed so that the ignition timing control device faces, making it compatible with diesel engines, and the electric ignition device is covered in an oil-tight manner with a cylindrical frame to protect it from lubricating oil in the governor device room. It is something.

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

FIG. 1 shows a longitudinal sectional front view of the main parts of a horizontal water-cooled electric ignition type engine. be.

Cylinder head 5 is located at the left end of crankcase 2.
and Rotsuka arm cover 6 are fixed in order,
A cylinder 8 in which a piston 7 is slidably housed is housed inside the crankcase 2.

The piston 7 is connected to a connecting rod 10 to a crankshaft 9 rotatably supported on the crankcase 2.
A combustion chamber 11 is formed between the upper part of the piston 7 and the cylinder head 5 which covers the left end of the crankcase 2.

The tip of the ignition plug 12 inserted and fixed from the outside of the cylinder head 5 faces the combustion chamber 11, and
It communicates with an intake and exhaust port 13 formed inside the cylinder head 5, and this communication is interrupted by an intake and exhaust valve 14 whose opening and closing are controlled via a valve mechanism V.

The valve train V has a valve train camshaft 16 that is driven via a 1/2 reduction mechanism 15 with respect to the rotation of the crankshaft 9.
, a tappet 17, a push rod 18, and a rocker arm 19.

The above-mentioned members are those of a horizontal diesel engine.

A centrifugal governor 22 is provided in a governor device chamber 20 formed at the front of the crankcase 2 and is driven by a governor gear 21 that meshes with the 1/2 speed reduction mechanism 15.
is housed inside, and an end of a valve drive camshaft 16 protrudes below it, and a rotor 23 is fixed to the tip of the valve camshaft 16 to form an ignition timing setting shaft T.

As shown in FIGS. 2 and 3, the rotor 23 is inserted from the outside of the shaft end of the camshaft 16 that protrudes into the governor device chamber 20, and is fixed with a bolt 24 at one location on the circumferential surface of the rotor 23. A protrusion 25 for ignition timing signal is formed on.

An ignition timing command device 26 is provided on the left side facing the rotation locus of the protrusion 25 provided on the rotor 23.

This ignition timing command device 26 is located in the governor device room 2.
The rear wall (inner end portion) 27a of the cylindrical frame 27 extends deep into the governor device chamber 20 from the large circular assembly opening 29 in the front wall (fixed wall) 20a of 0.
It is fixed with screws 28 to the rear wall 27 of the cylinder frame 27.
An oil seal 30, such as an O-ring, is used to provide an oil-tight seal between a and the ignition timing setting shaft T passing through it.

Further, a disc-shaped flange portion (outer end portion) 31 is formed near the front of the outer circumference of the cylinder frame 27, and this flange portion 31 is attached to the peripheral wall 20b of the assembly opening 29 with a screw 33 through a gasket 32. It is tightly fixed.

The peripheral wall 20 of the assembly opening 29 into which this screw 33 is inserted
As shown in FIG. 4, the screw hole 34 provided in b is formed into an arc concentric with the ignition timing setting axis T to constitute a phase adjustment means C. The screw hole 34 is loosened to rotate the cylinder frame 27. When the ignition timing command device 26 moves, the ignition timing command device 26 rotates relative to the ignition timing setting axis T, and the ignition timing is adjusted.

In this way, the oil seal 30 and the gasket 32
As a result, the ignition timing setting shaft T provided in the cylinder space 41 of the cylinder frame 27 and the ignition timing command device 26 are isolated and protected from the high temperature lubricating oil in the governor device chamber 20, so that the performance of the ignition timing command device 26 is improved. Deterioration is prevented.

Reference numeral 35 in the figure is a lid plate that covers the front opening of the cylinder frame 27. A cord 37 for transmitting a command signal from the ignition timing command device 26 to the ignition control device 36 is connected to the lid plate 35 via a rubber bush 38. It has been penetrated.

The ignition control device 36 is fixed to an end surface of a cover plate 40 that covers a pump mounting hole 39 into which a fuel injection pump is mounted when the engine 1 is a diesel engine.

In this way, the rotor 23, the ignition timing command device 2
6. The ignition control device 36 and the ignition plug 12 constitute an electric ignition device E for the engine.

Since the present invention is configured as described above, the shape and size of the ignition timing setting shaft, the supporting part of this shaft, the governor device chamber housing this shaft, and other structures around the shaft are all Since the structure, shape, and dimensions of the fuel camshaft and its surroundings can be made the same as that of a diesel engine, the equipment and processes for manufacturing and assembling the fuel camshaft can be made common, and mass productivity can be improved.

Moreover, unlike the structure of a diesel engine, the rotor for setting the ignition timing is fixed to the ignition timing setting shaft, which corresponds to the fuel camshaft, and the ignition timing command device, which constitutes the electric ignition system, is not placed facing the rotating surface of the rotor. Since the structure is simple and the manufacturing cost can be reduced, the structure is simple and the manufacturing cost can be reduced.

In addition, the rotor and ignition timing control device located in the governor chamber are installed in an oil-tight cylindrical frame, which prevents the high temperature lubricating oil in the governor chamber from heating up and reducing its performance. can be reliably prevented.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of a 4-cycle electric ignition engine, Figure 2 is a cross-sectional plan view of the main parts, Figure 3 is an enlarged cross-sectional plan view of the main parts, and Figure 4 is a front view of Figure 3. be. 1...Engine, 9...Crankshaft, 15...
Speed reducer, 20...Governor device room, 20a...2
0 fixed wall, 20b... peripheral wall, 23... rotor,
26...Ignition timing command device, 27...Cylinder frame, 29
... Assembly port, 30 ... Oil seal, 31 ... Outer end, 41 ... Cylinder space, E ... Electric ignition device,
T...Ignition timing setting axis.

Claims (1)

[Claims for Utility Model Registration] 1. A governor 22 and an ignition timing setting shaft T are provided in the governor device chamber 20 of the four-cycle engine 1, and the ignition timing setting shaft T is connected to the crankshaft 9 of the 1/2 reduction gear device 1.
5, an assembly opening 29 is formed in the fixed wall 20a on the outside of the tip surface of the ignition timing setting shaft T, and the cylinder frame 27 is placed in a position to be externally fitted onto the ignition timing setting shaft T through the assembly opening 29. The outer end 31 of the cylinder frame 27 is oil-tightly fixed to the peripheral wall 20b of the assembly port 29, and the ignition timing setting shaft T is fixed to the inner end 27a of the cylinder frame 27 with an oil seal. 3
The rotor 23 is fixed to the protruding shaft portion of the ignition timing setting shaft T, which is rotatably penetrated through the shaft in an oil-tight manner and protrudes into the cylinder space 41 of the cylinder frame 27. The ignition timing command device 26 of E is facing, and this ignition timing command device 26
An electric ignition device for a four-cycle engine, characterized in that the is fixed to a cylinder frame 27. 2.4 stated in paragraph 1 of claims for utility model registration
In an electric ignition device for a cycle engine, a cylindrical frame 27 is fixed to a peripheral wall 20b of an assembly port via a phase adjustment means C so as to be able to adjust its forward and backward phases along the rotational direction of a rotor 23.