JPS6323560Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic starting device for a vaporizer configured to open and close a plunger of a starting device using a temperature-sensitive wax, and in particular, the plunger and the operating rod of the temperature-sensitive wax are arranged orthogonally to each other. This invention relates to an automatic starting device for a carburetor.

In conventional automatic starting devices in which the plunger of the starting device is linked with temperature-sensitive wax and the plunger is actuated by the expansion and contraction of this temperature-sensitive wax, the temperature-sensitive wax does not protrude outward from the carburetor due to restrictions in fitting the engine. There is one in which a temperature-sensitive wax actuating rod is engaged with the starting plunger orthogonally.

Below is an example of a conventional automatic starting device for a carburetor.
This will be explained using figures. 1 is the carburetor main body, 2 is the intake passage, 3 is the throttle valve, 4 is the intake passage 2 bypassing the throttle valve 3
A bypass passage 5 connecting the two is a valve chamber provided on the bypass passage 4, and a starting fuel passage 6 that communicates with a carburetor fuel chamber (not shown) opens at the back of the valve chamber 5. 7 is a chamber formed by the carburetor body 1 and the cover 8; 9 is a plunger slidably accommodated in the valve chamber 5; and 10 is a rod projecting from the plunger 9. 11 is a pressure spring that presses the plunger 9 upward; 12 is a temperature-sensitive wax attached to the cover 8; 13 is an operating rod for the temperature-sensitive wax 12, which is provided in a direction perpendicular to the plunger 9; The hemispherical tip is attached to the rod 1 of the plunger 9.
0 is engaged with the head.

The conventional automatic starting device for a vaporizer constructed in this way is constructed such that the plunger 9 is pushed down by the tip inclined surface or hemispherical surface of the operating rod 13 of the temperature-sensitive wax 12, so that the rod 10 of the plunger 9 At the same time as it is pressed downward, it is also pressed laterally, increasing the sliding resistance of the plunger 9 and deteriorating its operability. Therefore, there is a drawback that galling of the plunger 9 is more likely to occur.

The present invention was devised in view of the above-mentioned drawbacks, and is an automatic starting device for a carburetor in which the starting plunger and the temperature-sensitive wax operating rod are arranged perpendicularly to each other. The purpose is to provide

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, with the same reference numerals assigned to the same parts as in the prior art.

14 is an operating rod for the temperature-sensitive wax 12;
The tip has an inclined surface and is provided eccentrically with respect to the center line XX of the temperature-sensitive wax 12. 1
5 has one end connected to the actuating rod 1 in the chamber 7 by a support shaft 16.
4 is a cam lever made of synthetic resin that is pivotally supported on the lower side and whose other end pressing portion 17 engages with the head of the rod 10 of the plunger 9. It is designed to push down the 9th rod 10th head. To further explain this cam lever 15 in detail, the cam lever 15 includes an engaging portion 18 whose surface that engages with the tip of the actuating rod 14 of the temperature-sensitive wax 12 is a hemispherical surface, and vertical walls 1 are provided on both sides of the engaging portion 18.
9, 19' are integrally provided, and these vertical walls 19,
A support shaft 16 is provided at one end of the plunger 19', and a pressing portion 17 for pressing the head of the rod 10 of the plunger 9 is formed at the other end.

The actuating rod 14 of the temperature-sensitive wax 12 is connected to the vertical wall 1 of the cam lever 15 as shown in FIG.
9 and 19', so that the actuating rod 14 itself does not rotate. 20 is a PTC heating element pressed into contact with the temperature-sensitive wax 12, and 21 is a heat insulating cover that accommodates the temperature-sensitive wax 12 and the PTC heating element 20.

The effect of the above configuration will be explained.

After the engine is started, the temperature-sensitive wax 12 is heated by the PTC heating element 20, and when the temperature-sensitive wax 12 expands, the actuation rod 14 protrudes to the left in the figure and presses the hemispherical engagement portion 18 of the cam lever 15. Then, the cam lever 15 is rotated counterclockwise, and the pressing portion 17 at the tip of the cam lever 15 presses the plunger 9 downward, thereby closing the bypass passage 4.
When the temperature-sensitive wax 12 cools and contracts, the actuating rod 14 moves to the right in the figure, so the plunger 9 is slid upward by the pressure spring 11 to open the bypass passage 4, and the cam lever 15 is moved to the rod of the plunger 9. 10 and rotated clockwise.

As described above, according to the present invention, in the automatic starting device for a carburetor, which is provided with a starting plunger and a temperature-sensitive wax operating rod orthogonally arranged, a support shaft is provided between the starting plunger and the operating rod. A cam lever is provided with an engaging part located on the lower side, the tip pressing part of which engages with the starting plunger head, and the tip of the actuating rod engaging between the support shaft and the pressing part, and the amount of protrusion of the actuating rod is adjusted. is converted into a rotational motion of a single cam lever, and this cam lever is used to push down the starting plunger, so that the acting force on the plunger is only in the downward direction, resulting in good operability of the starting plunger.

In addition, an engaging part with the actuating rod is provided between the support shaft of the cam lever and the pressing part, and the support shaft is positioned closer to the temperature-sensitive wax than the tip of the actuating rod, allowing the work rod to press the cam lever smoothly. There is an effect that can be done.

Furthermore, by changing the shape of the cam lever, the amount of descent of the starting plunger relative to the amount of movement of the actuating rod can be adjusted.

In addition, the operating rod of the tip inclined surface made of temperature-sensitive wax is provided eccentrically with respect to the center line of the temperature-sensitive wax,
By fitting this actuating rod between the vertical walls of the cam lever, the actuating rod itself does not rotate, so there is no need for positioning pins or slots as in the past, and there are fewer parts required for assembly. Work becomes easier.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example of a starting device for a carburetor, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG.
The figure is a plan view showing the engaged state of the cam lever and the actuating rod. 9...Plunger, 12...Temperature-sensitive wax,
14...Operating rod, 15...Cam lever, 16
... Support shaft, 17 ... Pressing part, 18 ... Engagement part, 2
0...PTC heating element.

Claims (1)

[Scope of utility model registration request] A starting plunger and a temperature-sensitive wax actuating rod are provided perpendicularly to each other, and the inclined surface of the tip of the actuating rod is engaged with the starting plunger head, so that the starting plunger is pushed down as the actuating rod protrudes. In the automatic starting device for a carburetor, the starting plunger and the actuating rod have an engaging part with which the tip of the actuating rod engages, and vertical walls provided on both sides of the engaging part. A cam lever is provided with a support shaft at one end of the vertical wall and a pressing portion at the other end, and the support shaft of the cam lever is positioned below the actuating rod,
An automatic starting device for a carburetor, characterized in that a pressing portion is engaged with a starting plunger head, and the actuating rod is eccentrically formed with respect to the center line of the temperature-sensitive wax.