JPH0631587B2 - Stick operating position confirmation device - Google Patents

Description

The present invention relates to a kick operation position confirmation device, and more particularly to a device for confirming an appropriate position for starting the operation of a kick starter lever.

Normally, it is not possible to confirm the stroke state of the stopped engine. Now, when the engine is in the state shown in FIG. 1, that is, in the state of shifting from the expansion stroke to the exhaust stroke, if the kick operation is started from this state, the piston is driven smoothly and the piston is obtained in the exhaust stroke and the intake stroke. The ignition position a is reached via a compression stroke with the help of the inertial forces exerted. Then, the compressed air-fuel mixture in the combustion chamber is ignited there by the spark plug and explodes to operate the engine. However, if the kick operation is started from this state when the engine is in the state shown in FIG. 1, that is, in the state of shifting from the intake stroke to the compression stroke, the compression stroke is immediately entered, and the operation is extremely heavy. b
In many cases, it cannot start because it cannot obtain sufficient inertial force.

In view of such circumstances, an object of the present invention is to provide a kick operation position confirmation device capable of easily confirming the proper position for starting the operation of the kick starter lever.

The present invention forcibly pushes open the exhaust valve in the closed state when the decompression cam is operated to the operating position against the spring force of the return spring, maintains the decompression cam in the operating position, and performs the kick operation. In the engine equipped with a decompression mechanism that returns the decompression cam to the original position by the return spring when the exhaust valve is pushed further open than when the decompression cam is operated by the rotation of the camshaft due to When the decompression cam and the decompression cam are maintained in the operating position, the decompression cam is relatively separated from the abutment piece, and the decompression cam is returned to the original position from the state in which the decompression cam is maintained in the operating position. And the abutted portion that produces a tapping sound between the abutting piece when the abutting piece collides with the abutting piece.

The present invention will be described below with reference to the embodiments shown in the drawings.

2 to 4 show an embodiment of the kick operation position confirmation device according to the present invention. In this device, the second
As shown in the figure, the decompression shaft 3 is arranged above the rocker arm 2 for the exhaust valve 1. As shown in FIG. 4, a cam 4 is provided around one end of the decompression shaft 3 and an abutment piece 5 is provided around the other end thereof. In the decompression shaft 3, the cam 4 is made to face the upper surface of the rocker arm 2, and the abutting piece 5 is made to face the abutted portion 7 formed in the head cover 6 as shown in FIG. 6, a spring 8 mounted between the decompression shaft 3 and the head cover 6 urges the abutting piece 5 to abut the abutted portion 7. On the other hand, an operating lever (not shown) is installed at an appropriate portion of the vehicle body, such as a handle, and the operating lever and the abutting piece 5 are connected to each other by a cable 9.

The operation of the kick operation position confirmation device will be described below. Normally, the decompression shaft 3 is rotated in one direction by the urging force of the spring 8, and the abutting piece 5 is held in contact with the abutted portion 7 of the head cover 6. The cam 4 of the decompression shaft 3 in this state is in a state in which its valley 4a faces the upper surface of the rocker arm 2 and is separated from the arm (see FIG. 2).

Here, when the operation lever is operated and the cable 9 is pulled, the decompression shaft 3 is rotated via the abutting piece 5 against the biasing force of the spring 8. And this decompression shaft 3
Presses the upper surface of the rocker arm 2 with the mountain 4b of the cam 4 and presses the arm to open the exhaust valve 1. Even if the operation lever is released in this state,
The decompression shaft 3 is maintained in that state (set state) without returning to the original state due to the frictional resistance between the cam 4 and the rocker arm 2.

Then, when the kick lever is operated, the camshaft 10 is rotated in synchronization with the rotation of the crankshaft. When the camshaft 10 is rotated in this manner, the peak 11 of the exhaust cam 11 is
The a contacts the rocker arm 2, and the arm is rotated clockwise in FIG. 2 to further open the exhaust valve 1. Then, the rocker arm 2 is separated from the cam 4 of the decompression shaft 3, so that the decompression shaft 3 is returned to the original state shown in FIG. 2 by the urging force of the spring 8. At that time, the abutting piece 5 collides with the abutted portion 7 of the head cover 6 to generate a tapping sound.

This tapping sound indicates the proper position for the exhaust stroke, that is, the operation start of the kick starter lever. Therefore, when a tapping sound is generated, the stepping operation of the kick starter lever may be stopped, the kick starter lever may be returned to the initial position, and the lever may be stepped on again.

In the above embodiment, when the decompression shaft 3 is in the set state, the exhaust valve 1 is in the opened state,
That is, it goes without saying that it is in a decompression working state.

Another embodiment is shown in FIGS. In the kick operation position confirmation device of this embodiment, an actuation shaft 12 is attached to the decompression shaft 3 of the above embodiment, and the actuation shaft is linked to the operation mechanism of the kick starter interlocking decompression device.

The operating shaft 12 is located concentrically with the decompression shaft 3 and is supported by the head cover 6. A lever 13 having an abutting portion 7 is fixed to one end of the operating shaft 12, and an operating lever 14 is fixed to the other end thereof. One end of a cable 15 is locked to the operating lever 14, and the other end of the cable 15 is locked to an arm of an operation mechanism described later. One end of a tension spring 16 is further locked to the actuating lever 14, and the other end of the spring is locked to the head cover 6. The actuating shaft 12 has the abutted portion 7 fixed by the urging force of the spring 16, as shown in FIG. The decompression shaft 3 shown in FIG. 5 is installed on the head cover 6 in the same manner as in the above embodiment,
The urging force of the spring 8 normally causes the abutting piece 5 to abut against the abutting piece 7 as shown in FIG. 6 (a).

Therefore, when the cable 15 is pulled, the actuating shaft 12 is turned via the actuating lever 14, and the pulling abutting portion 7 of the lever 13 is turned against the biasing force of the spring 16. Therefore, the abutting piece 5 of the decompression shaft 3 is integrally rotated by the abutted portion 7 of the lever 13 against the biasing force of the spring 8 as shown in FIG. 6 (b). And the decompression shaft 3
The mountain 4b of the cam 4 presses the upper surface of the rocker arm 2, and the exhaust valve 1 is opened by pressing the arm. When the pulling force of the cable 15 is released in this state, the actuating shaft 12 is rotated in the opposite direction together with the actuating lever 14 by the urging force of the spring 16, and the abutted portion 7 of the lever 13 is returned to its original position. Restore. However, at that time, the decompression shaft 3 does not return to the original state due to the frictional resistance between the cam 4 and the rocker arm 2, and the decompression shaft 3 is not returned to the original state.
As shown in (c), the state (set state) is maintained.

The decompression shaft 3 in this set state is further depressed by the kick lever described later, and the mountain 11a of the exhaust cam 11 is
When the rocker arm 2 is pushed down, the rocker arm 2 separates from the rocker arm 2 and is returned by the biasing force of the spring 8 as shown in FIG. 6 (d). At that time, the abutting piece 5 collides with the abutted portion 7 of the lever 13 to generate a tapping sound.

This tapping sound indicates the proper position for the exhaust stroke, that is, the operation start of the kick starter lever. Therefore, when a tapping sound is generated, the stepping operation of the kick starter lever may be stopped, the kick starter lever may be returned to the initial position, and the lever may be stepped on again.

In addition, when pulling in the cable 15, the exhaust valve 1
If the rocker arm 2 is opened, the rocker arm 2 immediately
When it is in the state of riding on the mountain 11a, the cable 15 is retracted so that the decompression shaft 3 is moved to the position shown in FIG. 6 (b).
However, when the pulling force of the cable 15 is released, it is not set and the operating shaft
Along with 12, return to the original state. In this case, the collision between the abutting piece 5 and the abutted portion 7 does not occur, and therefore, no tapping sound is generated.

The operating mechanism of the cable 15 is shown in FIGS. 7 and 8. In this operating mechanism, an operating shaft 22 is continuously provided on the axis of the kick starter shaft 21, a cable operating arm 23 is fixed to an outer end portion of the operating shaft, and an inner end portion of the kick starter shaft 21 and an inner portion of the kick starter shaft 21 are fixed. Dog clutch 24 between the ends
Is configured. Reference numeral 25 is a kick starter lever.

The kick starter shaft 21 and the operating shaft 22 are independently supported by the transmission case 26, and the spline 21 is provided on the inner peripheral surface of the kick starter shaft 21.
a is formed. One clutch member 27 constituting the dog clutch 24 is fixed to the inner peripheral surface of the operating shaft 22, and the other clutch member 28 has a spline 28a formed on the inner peripheral surface of the clutch member 28.
Is fitted to the spline 21a of the kick starter shaft
It is arranged so that it cannot rotate with respect to 21 and can slide in the axial direction. The clutch member 28 is biased toward the clutch member 27 by a compression spring 29 arranged between the member and the case 26. Further, the clutch member 28 has a protrusion 30 formed in a part of the periphery thereof, and
A guide plate 31 is fixed to 26, and this plate is installed in the moving range of the protrusion 30 as shown in the figure. In the drawing, reference numerals 27a and 28b denote clutch members 27 and 28.
It is a dog formed in each.

This operating mechanism works as follows. When the kick starter lever 25 is operated, the kick starter shaft 21 is rotated with the lever, and the clutch member 28 is rotated with the shaft. When the clutch member 28 is rotated, its rotational force is transmitted to the clutch member 27 via the dogs 28b and 27b, and the operating shaft 22 is transmitted via the clutch member.
To rotate the operating shaft. When the actuating shaft 22 is rotated in this manner, the actuating arm 23 is accordingly rotated and the cable 15 is pulled in. Kick starter lever 25
When is further stepped on, the kick member 28 further rotates together with the kick starter shaft 21, and the projection 30 of the clutch member comes into contact with the guide plate 31. Then, the clutch member 28 is guided by the guide plate to rotate further, and is separated from the clutch member 27. When the clutch member 28 separates from the clutch member 27, the clutch member 27, the operating shaft 22, the operating arm 23, and the cable 15
Is returned to its original position by the spring 16.

When the operation of the kick starter lever 25 is released, the kick starter shaft 21 is reversely rotated with the return of the kick lever, and the clutch member 28 is also rotated in the reverse direction along with the shaft, so that the clutch member 28 is re-clutched. It meshes with the member 27.

The kick operation position confirmation device provided with such an operation mechanism is used as follows. First, when the kick starter lever 25 is actuated, the cable 15 is pulled in, whereby the decompression shaft 3 is set. When the kick starter lever 25 is further operated, the set state of the decompression shaft 3 is released along with the exhaust operation of the rocker arm 2 by the exhaust cam 11 of the camshaft 10, and the abutting piece 5 of the decompression shaft 3 is released by the lever 13. The striking sound is generated by colliding with the hitting portion 7 of. Therefore, the operator can surely start the engine by stopping the operation of the kick starter lever 25, returning the lever to the initial position, and starting the operation of the kick starter lever 25 from there.

In this embodiment, even when the engine is in the state of shifting from the intake stroke to the compression stroke (state in FIG. 1), the decompression action is performed at the initial operation of the kick starter lever 25, so that the kick operation is performed. It can be done easily.

As described above, the kick operation position confirmation device according to the present invention can confirm the proper position of the kick operation start by the striking sound, and therefore can surely start the engine.

[Brief description of drawings]

FIG. 1 is a graph for explaining the kick operation start position and engine startability, FIG. 2 is a cross-sectional front view showing a main part of a kick operation position confirmation device according to the present invention, and FIG. FIG. 4 is a sectional side view of the same, FIG. 5 is a perspective view of essential parts showing another embodiment of a kick operation position confirmation device according to the present invention, and FIG. 6 is a view showing its operation mode, FIG. FIG. 7 is a vertical sectional view showing the operating mechanism, and FIG. 8 is a sectional view taken along the line AA in FIG. 1 ... Exhaust valve, 2 ... Rocker arm, 3 ...
… Decompression shaft, 4 …… Cam, 4a …… Valley, 4b ……
Mountain, 5 ... Abutting piece, 6 ... Head cover, 7 ... Abutting portion, 8 ... Spring, 9 ... Cable, 10 ... Cam shaft, 11 ... Exhaust cam, 11a ... Mountain, 12 …… Operating shaft, 13 …… Lever, 14 …… Operating lever, 15 …… Cable, 16 …… Spring, 21 …… Kick starter shaft, 22…
… Actuating shaft, 23 …… Cable actuating arm, 24 …… Dog clutch, 25 …… Kick starter lever, 26 …… Transmission case, 27,28 …… Clutch member, 29 …… Spring, 30 …… Projecting part, 31… …Guide plate.

Claims (1)

[Claims] 1. An exhaust valve in a closed state is forcibly pushed open when the decompression cam is operated to an operating position against the spring force of a return spring, and the decompression cam is maintained at the operating position. In an engine provided with a decompression mechanism that returns the decompression cam to the original position by the return spring when the exhaust valve is further pushed open than when the decompression cam is operated by the rotation of the camshaft accompanying the operation, The interlocking abutment piece and the decompression cam are spaced apart from the abutment piece when the decompression cam is maintained at the operating position, and the decompression cam is maintained at the operating position from the original position by the return spring. And an abutted portion that generates a tapping sound between the abutting piece and the abutting piece when returning to the Click the operating position verification device.