JPS6033306Y2 - Throttle stop screw sealing device - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a throttle stop screw that positions the throttle valve at the idling position in a carburetor by regulating the tufting of the throttle lever during idling, and is particularly useful when adjusting the idling. This invention relates to a sealing device for a throttle stop screw that prevents the rotation speed from being adjusted outside the specified range.

[Conventional technology]

In a carburetor, a throttle stop screw is installed on the tufted side of the throttle lever that is attached to the valve stem of the throttle valve, and one end of the throttle stop screw is placed on the throttle lever during idling to control the idling, with the throttle valve almost closed. It is designed to be placed in position.

[Problem that the invention aims to solve] By the way, conventional throttle stop screws are simply screwed onto the carburetor body and can move freely without being restricted in any way. There is also a risk that the idle speed may be adjusted to an abnormal value, which may lead to increased pollution from exhaust gas.

Therefore, in recent years, there has been a demand for preventing the rotational speed during idling from being adjusted outside the specified range, as in the tamper-proof regulations in the United States.

[Means for solving problems]

The present invention was developed to meet these demands, and includes a throttle stop screw that is screwed into a threaded hole in the carburetor body through a screw sleeve, and a head that abuts against the throttle lever side; and a clip attached to the clip groove on the opposite side, and these heads and clips restrict movement when adjusting increase or deceleration, and also prevent the clip from vaporizing even if the throttle stop screw is moved all the way to the clip side. To provide a throttle stop screw sealing device which is held buried in a screw hole of a device main body, has a structure that makes it impossible to release the restriction by removing the clip, and virtually makes it impossible to adjust the idle outside the specified rotation speed range. It is something.

In addition, as a means to solve similar problems,
There are prior art techniques described in Japanese Utility Model Application Publication No. 4-3773@, Japanese Utility Model Application Publication No. 55-170451, and Japanese Utility Model Application Publication No. 56-86337, but these are all different in structure in that they do not include the screw sleeve of the present invention.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In FIG. A throttle lever 5 is integrally attached, and this lever 5
An accelerator cable 6 from an accelerator pedal (not shown) is connected in the direction to open the throttle valve 3, and a return spring 7 is urged in the direction to close the throttle valve 3.

Then, a throttle stop screw 8 is attached to the carburetor body 1 on the starting end side of the swinging range of the throttle lever 5.
is provided, and during idling, this screw 8 comes into contact with the throttle lever 5 to regulate the idling position of the throttle valve 3.

As detailed in FIG. 2, one end of the throttle stop screw 8 is integrally formed with a head 8a that comes into contact with the throttle lever 5, and the other end has a groove 9 for inserting a tool. The entire area except the head 8a is screwed,
Such a throttle stop screw 8 is screwed into the screw sleeve 10.

The screw sleeve 10 has a high-precision thread lea on the inside and tightly screws into the screw 8 as described above, whereas it has a loose thread 10b with low precision on the outside, and has a loose thread 10b at one end. For example, there is a groove 1 for inserting a tool in two opposing places.
3 and 13', and a recess 14 is formed inside thereof.

Then, with the screw sleeve 10 pushed all the way to the head 8a of the throttle stop screw 8,
A circlip 12 is fitted into the clip groove 11 on the opposite side of the head 8a of the screw 8, and the head 8a and the circlip 12 hold the screw 8 against the screw sleeve 10.
The forward and backward movement of people is now regulated.

In this way, the screw sleeve 10 and the head 8 of the screw 8
a and the screw sleeve 10.
Even if the screw 8 is moved fully to one side in order to provide a speed increase adjustment allowance β between the circlip 12 and the circlip 12 in the recess 14 and to make the deceleration adjustment allowance α zero, the recess 14 allows the screw of the circlip 12 to The amount of protrusion to the outside of the sleeve 10 is reduced.

On the other hand, the screw sleeve 10 equipped with the throttle stop screw 8 is further loosely screwed into the threaded hole 15 of the carburetor body 1 by the outer screw 10b, and after the initial idle adjustment (for example, adjustment performed on the production line), the screw sleeve 10 is screwed loosely into the screw hole 15 of the carburetor body 1. It is integrally fixed to the carburetor body side by caulking.

Here, the screw hole 15 has a depth that allows the circlip 12 to remain in the screw hole 15 even when the deceleration adjustment allowance α is set to zero.
and has an inner diameter smaller than sufficient space to remove the circlip 12.

Further, the circlip 12 is formed to be easily cut when the throttle stop screw 8 is forcibly twisted with the screw sleeve 10 beyond a specified range.

Since the present invention is configured in this way, the throttle stop screw 8 is screwed onto the screw sleeve 10 and the circlip 12 is attached, and the screw sleeve 10 is connected between the head 8a of the screw 8 and the circlip 12. The screw sleeve 10 is positioned approximately in the center between the screw sleeves 10 and 10 so that predetermined deceleration and speed increase adjustment allowances α and β are obtained before and after the screw sleeve 10.

Next, the screw sleeve 10 equipped with the throttle stop screw 8 is further loosely screwed into the screw hole 15 on the side of the carburetor main body 1, and moved to a predetermined position to perform initial idle adjustment.

In this case, for example, a special tool is used, as indicated by the reference numeral 16 in FIG. 3a.

This tool 16 consists of a cylindrical portion 16a that loosely fits on a part of the outside of the throttle stop screw 8, and at least two teeth 17 and 17' protruding from the tip of the cylindrical portion 16a, as shown in the figure. While fitting the cylindrical portion 16a onto the screw 8, insert the teeth 17.
17' is engaged with the grooves 13 and 13' of the screw sleeve 10 and turned, thereby allowing the screw sleeve 10 to be rotated without touching the throttle stop screw 8.

When the initial idle adjustment is performed by moving the screw sleeve 10 in this manner, the screw sleeve 10 is fixed to the carburetor main body 1 by adhesive or the like so that the screw sleeve 10 does not move thereafter.

Therefore, after this, during periodic inspections, etc., the reduction distance α between the end face of the screw head 8a and one end face of the screw sleeve 10,
Idle adjustment is performed by moving the throttle stop screw 8 forward and backward within the speed increase adjustment range β between the circlip 12 and the inner surface of the recess 14 of the screw sleeve 10.

At this time, the circlip 12 is always buried in the screw hole 15, and the circlip 12 cannot be removed due to lack of space.
This prevents adjustment outside the specified number of circuits by removing 2.

[Effect of idea]

As described above, according to the present invention, the movement range of the throttle stop screw 8 is regulated by the head 8a at one end and the circlip 12 attached to the opposite side, and the circlip 12 is connected to the screw sleeve 10 when it is assembled.
Although the throttle stop screw can be easily installed due to the relationship between the 8 is reliably sealed, and idle adjustment within the specified rotational speed range can be almost permanently guaranteed.

In addition, such a sealing effect is achieved by attaching the screw sleeve 10 equipped with the throttle stop screw 8 to the carburetor main body 1.
This occurs automatically by screwing into the screw hole 15 of the
It has a simple structure and is easy to assemble.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of an embodiment of the device according to the present invention, Figure 2 is an enlarged sectional view of the main part, and Figures 3a and 3b are examples of tools used to rotate the screw sleeve. FIG. 2 is a perspective view showing the device and a sectional view showing the state of use. 1... Carburetor body, 3... Throttle valve, 4... Valve shaft, 5... Throttle lever, End... Throttle stop screw ,8a
...Head, 10...Screw sleeve, 12...Circlip, 14...Indentation.

Claims (1)

[Scope of utility model registration request] A throttle stop screw is brought into contact with a throttle lever attached to a valve shaft of the throttle valve to regulate the idle position of the throttle valve, and the throttle stop screw is screwed into a screw sleeve, and the throttle stop screw is provided. The screw sleeve is further screwed into the threaded hole of the carburetor main body, and the throttle stop screw has a head that contacts the throttle lever side and a clip that is attached to the clip groove on the opposite side of the head, and the throttle stop screw is A throttle stop screw sealing device, characterized in that the clip is configured to remain unremovably embedded in the screw hole of the carburetor body even when the clip is fully moved toward the clip side.