JPS5823017Y2 - Contact breaker device in engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a contact breaker device for an ignition circuit in a small, general-purpose, side-valve internal combustion engine.

The applicant of the present application has previously developed a device of this type in which a crankshaft and a camshaft having a valve drive cam are housed in a crankcase.
A follower that engages with the valve operating cam and a rod that is pushed forward by the follower as the follower tilts are provided, and the rod protrudes outside through a shaft hole formed in a side wall of the case. A point part consisting of a movable contact at the tip of the rod and a fixed contact opposite thereto, and a capacitor part connected to the point part are accommodated in the small chamber. However, a method was proposed in which the valve drive cam was also used as a point cam to simplify the configuration (see Utility Application No. 52-80561). Generally speaking, there is a type in which the above-mentioned follower is disposed at a side position of the valve rod in the vertical direction and is substantially parallel to the valve rod and engages with the lower surface of the above-mentioned valve drive cam at the base thereof, which is substantially perpendicular to the above-mentioned follower. In such a system, the follower is arranged on the lower surface of the valve drive cam, and the rod is arranged on the side thereof, resulting in an abbreviated arrangement as a whole, which requires a relatively large space, and is not always suitable. It's not right.

The purpose of the present invention is to obtain a device that eliminates such inconveniences. A follower 5 that engages with the follower 5 and a rod 6 that is pushed forward by the follower 5 as it tilts are provided, and the rod 6 is inserted through a shaft hole 8 formed in the side wall 7 of the case 4. A movable contact 10 at the tip of the rod 6 is projected outside and faces into a small chamber 9 previously formed outside.
, a contact breaker device in an engine that accommodates a point part 12 that is connected to a fixed contact 11 facing the fixed contact 11 and a capacitor part 13 connected to the fixed contact 11 is pressed, and the rod 6 is connected to the valve drive cam. The follower 5 is disposed in a lateral direction substantially perpendicular to the valve rod 14 in the vertical direction on its upper surface that engages with the valve rod 6, and the follower 5 is disposed substantially perpendicular to the valve rod 6. The special driven element 5, which is characterized by being engaged with the side surface of the cam 2, is made up of an elastic tongue piece that is bent into a generally rectangular shape, which is fixed at its lower end with a screw 15, and whose upper end is bent into a generally arc shape. It is curved to engage the side surface of the valve operating cam 2, and is further connected to the root end of the rod 6 at its intermediate portion.

The small chamber 9 is formed in the horizontal direction along the length of the rod 6, and the capacitor section 13 inside thereof is stabilized in a predetermined position by a spring 19 at one end and a screw 20 at the other end. I did it like that.

The valve rod 14 can also be formed into an incline between an intake valve and an exhaust valve.

In the drawings, reference numeral 16 indicates a piston inside the cylinder barrel 17, and reference numeral 18 indicates a combustion chamber on its upper surface.

Its operation is not significantly different from that proposed earlier,
As the valve operating cam 2 rotates, the valve rod 14 is moved up and down, and the rod 6 moves back and forth via the follower 5, thereby opening and closing the point portion 12.

In this way, according to the present invention, the rod 14 is arranged in the lateral direction, and the rod 14 is engaged with the side surface of the valve drive cam 2 at the follower 5 at its root, which is substantially orthogonal to this, and these rods as a whole form the valve drive cam. By being concentrated at a side position close to the cam 2, the entire structure can be made relatively compact, and the following effects of the rod 14 on the valve operating cam 2 can be improved.

[Brief explanation of the drawing]

The drawing is a cutaway side view of an example of the present device. DESCRIPTION OF SYMBOLS 1... Crankshaft, 2... Valve drive cam, 3... Camshaft, 4... Crank case, 5... Follower, 6...
・Rod, 7... Side wall, 8... Shaft hole, 9... Small chamber, 10... Movable contact, 11... Fixed contact, 12...
・Point part, 13... Capacitor part.

Claims (1)

[Scope of utility model registration request] In a crankcase 4 that accommodates a crankshaft 1 and a camshaft 3 having a valve cam 2, there is a follower 5 that engages with the valve cam 2, and is pushed by the follower 5 as the follower 5 tilts. A rod 6 that moves forward is provided, and the rod 6 is made to protrude to the outside through a shaft hole 8 formed in the side wall 7 of the case 4 so as to face into a small chamber 9 previously formed outside the case 4. Small room 9
In a contact breaker device for an engine, which houses a point part 12 consisting of a movable contact 10 at the tip of the rod 6 and a fixed contact 11 opposite thereto, and a capacitor part 13 connected to the fixed contact 11. , the rod 6 is disposed in a horizontal direction substantially perpendicular to the valve rod 14 in the vertical direction on the upper surface thereof that engages with the valve operating cam 2, and the follower 5 is disposed substantially perpendicular to the rod 6. A contact breaker device for an engine, characterized in that the follower 5 is engaged with a side surface of the valve drive cam 2.