JPH066228Y2 - Engine starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of Invention] (Industrial field of application) The present invention facilitates starting by releasing the compression pressure in the combustion chamber at the time of starting a two-cycle engine that is started by a recoil starter or the like. The present invention relates to a starting device for an engine.

(Prior Art and Problems to Be Solved) Conventionally, in this type of engine, at the time of starting, the reaction force of the compression pressure by the piston acts on the recoil starter, and a large force is required to operate the recoil starter.
Moreover, when using a starting motor, a large motor was required.

[Constitution of device]

(Means and Actions for Solving the Problem) The present invention is provided with a cylindrical valve body that is closed by abutting against a valve seat provided at an opening in a valve chamber of a communication passage communicating with the atmosphere, In this valve chamber, a valve cylinder is slidably fitted with an appropriate gap, and a support cylinder whose lower part is sealed is provided. A gap portion for communicating the combustion chamber of the engine with the communication passage is provided on the outer periphery of the support cylinder. A communication hole is provided which penetrates the support cylinder and the valve body in the lateral direction and communicates the gap portion with the inner diameter portion of the valve body, and when the valve body is in the lower position by the urging force of the ammunition, the communication passage and When both the communication holes are opened and the valve body is in the upper position due to the explosion pressure of the engine, the engine starter is provided to close both the communication passage and the communication hole. The communication passage is open,
The compression pressure of the piston applied to the recoil starter is released, and the recoil starter can be operated easily. When the engine ignites, the valve body closes the communication passage by the explosion pressure, and this closed state is held by the pressure in the support cylinder that accumulates the explosion pressure, regardless of the fluctuation of the pressure in the combustion chamber due to the reciprocating motion of the piston. The engine operates normally with the closed state of the valve body. After the engine is stopped, the pressure in the support cylinder leaks from the gap and the valve body is restored to its original open state by the ammunition.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

Although the present invention relates to an engine in which the top of the cylinder is directed upward, the case where the engine is used in a position in which the cylinder is directed laterally or downward is also included in the present invention. is there.

In the figure, an ignition plug 7 and an on-off valve 9 are screwed into a combustion chamber 5 at the top of a piston 3 in a cylinder 1. On-off valve 9
Is constructed as follows. That is, the cylindrical valve body 11 is screwed onto the top of the cylinder 1 by the lower threaded portion 13 via the washer 15 and opens upward.
The valve seat body 19 is press-fitted in the upper part, and a cylindrical valve chamber body 23 having a valve chamber 21 opening upward is formed inside the screw 25.
Is screwed by. A communication passage 27 communicating with the atmosphere penetrates through the valve seat body 19, and a valve seat 29 is provided at an opening portion of the communication passage 27 in the valve chamber 21. A valve body 31 that abuts and closes the valve seat 29 is formed in a cylindrical shape with an upper part hermetically sealed.
It is pressed downward by 3. A valve retainer lid 35 is screwed onto the upper end of the valve seat body 19. In the valve chamber 21, a valve body 31 is slidably fitted with a proper gap, and a support cylinder 37 whose lower part is sealed is integrally fixed to the bottom of the valve body 11. A gap portion 39 that communicates the combustion chamber 5 of the engine with the communication passage 27 is provided on the outer periphery of the support cylinder 37. A communication hole 41 penetrating the support cylinder 37 and the valve body 31 in the lateral direction is provided to communicate the gap portion 39 and the inner diameter portion 43 of the valve body 31. When the valve body 31 is at the lower position by the ammunition 33, both the communication passage 27 and the communication hole 41 are opened and communicated, and when the valve body 31 is at the upper position due to the explosion pressure of the engine, the communication passage 27, The communication hole 41 is provided so as to be closed.

In the above configuration, when starting the engine, when the engine is rotated by the recoil starter (not shown), the on-off valve 9 is in the state shown in FIG. 1 and the air-fuel mixture compressed by the piston 3 is in the gap portion. 39 to ammo 3
3, the valve body 31 is released to the atmosphere through the communication passage 27 in the open state. Therefore, the reaction force due to the compression pressure in the combustion chamber 5 disappears, and the recoil starter allows easy rotation. When the air-fuel mixture is ignited by the spark plug 7, explosive pressure enters the inner diameter portion 43 of the valve body 31 from the gap 39 through the communication hole 41 and pushes up the valve body 31 against the ammunition 33 to move the communication passage 27. Simultaneously with the closing, the communication hole 41 is closed, the on-off valve 9 enters the state shown in FIG. 2, and the engine starts to rotate. The explosion pressure trapped in the inner diameter portion 43 keeps the valve body 31 closed. While the engine is rotating, even if the pressure in the inner diameter portion 43 of the valve body 31 leaks from the gap on the outer circumference of the valve body 31, the pressure in the gap portion 39 becomes the explosion pressure each time the engine explodes. The explosion pressure is maintained without lowering and the valve body 31 maintains the closed state. When the engine is stopped, the valve body 3
The pressure in the inner diameter portion 43 of the valve body 31 leaks from the gap on the outer periphery of the valve 1, and the pressure drops. Therefore, the valve body 31 is
3, the communication passage 27 and the communication hole 41 are opened to return to the original state shown in FIG.

[Effect of device]

According to the present invention, when the engine is started, the communication passage is opened to release the compression pressure of the piston applied to the recoil starter or the like to eliminate the reaction force, thereby facilitating the starting of the engine, and moreover, the communication passage while the engine is rotating. It is possible to prevent the vibration of the valve body by keeping the valve closed.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a side sectional view of an essential part in another state. 5 ... Combustion chamber, 21 ... Valve chamber 27 ... Communication passage, 29 ... Valve seat 31 ... Valve body, 33 ... Ammunition machine 37 ... Support cylinder, 39 ... Gap 41 ... Communication hole, 43 ... Inner diameter

Claims (1)

[Scope of utility model registration request] 1. A valve body having a communication passage 27 communicating with the atmosphere is closed by contacting a valve seat 29 provided at an opening in a valve chamber 21, and a cylindrical valve body 31 having a closed upper portion is provided. A support cylinder 37, in which the valve body 31 is slidably fitted with a proper gap and the lower part is sealed, is provided in the inside of the engine 21, and the combustion chamber 5 of the engine and the communication passage 27 are provided on the outer periphery of the support cylinder 37. And a communication hole 41 that communicates the space 39 with the inner diameter portion 43 of the valve body 31 by penetrating the support cylinder 37 and the valve body 31 in the lateral direction. When the valve body 31 is in the lower position due to the urging force of the machine 33, both the communication passage 27 and the communication hole 41 are opened, and when the valve body 31 is in the upper position due to the explosion pressure of the engine, the communication passage 27 is opened. The passage 27 and the communication hole 41 are provided so as to be closed. Engine starting system according to claim.