JPS6115224Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an idle adjustment device that regulates the throttle valve to the idling position by bringing the throttle stop screw into contact with the throttle lever during idling in a carburetor. In particular, it relates to something that prevents the rotation speed from being adjusted outside the specified range.

[Conventional technology]

In a carburetor, a throttle stop screw is provided at the starting end of a throttle lever that is attached to the valve stem of the throttle valve.During idling, the throttle lever comes into contact with the throttle stop screw to stop the throttle valve from idling. Location is now regulated.

[Problem that the invention attempts to solve]

By the way, since the conventional throttle stop screw is simply screwed onto the carburetor body, there is a risk that the engine speed may be adjusted outside the specified rotation speed range, causing the idle speed to be set to an abnormal value. This caused an increase in 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 in order to meet these demands.The screw sleeve to which the throttle stop screw is screwed is further screwed onto the carburetor body, and the throttle stop screw is screwed onto the carburetor body. It has a head that touches the lever side and a clip that is attached to the opposite side, allowing it to move slightly in either forward or backward directions within the throttle lever, making it possible to adjust the specified deceleration and speed increase during idling. An object of the present invention is to provide an idle adjustment device that makes it impossible to adjust the rotation speed outside the specified rotation speed range.

In addition, as a means to solve similar problems,
There are prior art techniques described in Japanese Utility Model Application Publication No. 54-37730, Japanese Utility Model Application Publication No. 55-170451, and Japanese Utility Model Application Publication No. 56-86337, but these are all lacking in that they do not include the screw sleeve of the present invention. The configuration is different.

〔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 an accelerator cable 6 from an accelerator pedal (not shown) is connected to the lever 5 in the direction of opening the throttle valve 3, and a return spring 7 is biased in the direction of closing the throttle valve 3. has been done. A throttle stop screw 8 is provided in the carburetor body 1 at the starting end of the swing range of the throttle lever 5, and when idling, the screw 8 is brought into contact with the throttle lever 5 to close the throttle valve. The idling position of No. 3 is regulated.

By the way, as detailed in FIG. 2, a head 8a that comes into contact with the throttle lever 5 is integrally formed at one end of the throttle stop screw 8, and a groove 9 for inserting a tool is formed at the other end. The entire area except the head 8a is threaded, and such a throttle stop screw 8 is connected to the screw sleeve 10.
It is screwed inside. The screw sleeve 10 has a high-precision screw 10a on the inside and tightly screws into the screw 8 as described above, whereas the screw sleeve 10 has a loose screw 10b with low accuracy on the outside and has one end. For example, there are grooves 13 for inserting tools in two opposing places,
13', and a recess 14 is formed inside thereof. Then, with the screw sleeve 10 fully pushed toward the head 8a of the throttle stop screw 8,
A circlip 12 is fitted into the clip groove 11 on the opposite side, and the head 8a and the circlip 12
The forward and backward movements of the screw 8 with respect to the screw sleeve 10 are restricted. In this way, a deceleration adjustment allowance α is created between the screw sleeve 10 and the head 8a of the screw 8, and the screw sleeve 10
Even when the screw 8 is moved all the way to one side in order to set a speed increase adjustment allowance β between the recess 14 and the circlip 12 and to make the deceleration adjustment allowance α zero, the recess 14 prevents the screw sleeve of the circlip 12. 10 The amount of protrusion to the outside is reduced.

On the other hand, the screw sleeve 10 equipped with the throttle stop screw 8 is further loosely screwed into the screw hole 15 of the carburetor body 1 by an outer screw 10b, and is used for initial idle adjustment (for example, adjustment performed on a production line). After that, it is integrally fixed to the carburetor body side using Loctite or 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 an inner diameter that is smaller than a sufficient space to remove the circlip 12. Further, the circlip 12 is formed so as to be easily cut when the throttle stop screw 8 is screwed in beyond a specified range and the screw sleeve 10 is forcibly screwed.

Since the present invention is constructed in this way, the throttle stop screw 8 is screwed onto the screw sleeve 10 and the circlip 12 is attached.
The screw sleeve 10 is attached to the head 8 of the screw 8.
a and the circlip 12, so that predetermined deceleration and acceleration 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 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. That is, this tool 16 is made up of a cylindrical portion 16a that is loosely fitted to a part of the outside of the throttle stop screw 8, and at least two teeth 17, 17' protruding from the tip of the cylindrical portion 16a, as shown in the figure. As shown in b, while fitting the cylindrical portion 16a to the screw 8, insert the teeth 17, 17' into the screw sleeve 1.
It is rotated by meshing with the grooves 13 and 13' of 0,
This allows 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 way,
The screw sleeve 10 is fixed to the vaporizer main body 1 by adhesive or the like so that the screw sleeve 10 does not move after that.

Therefore, after this, during periodic inspections, etc., the deceleration adjustment allowance α between the end face of the screw head 8a and one end face of the screw sleeve 10, and the speed increase between the circlip 12 and the inner surface of the recess 14 of the screw sleeve 10 will be checked. Idle adjustment is performed by moving the throttle stop screw 8 forward and backward within the range of adjustment allowance β. At this time, the circlip 12 is always buried in the screw hole 15 and cannot be removed due to lack of space, so it is not possible to remove the circlip 12 and adjust the rotation speed outside the specified rotation speed range. It is prevented.

[Effect of idea]

As described above, according to the present invention, the forward and backward movement range of the throttle stop screw 8 is restricted by the head 8a at one end and the circlip 12 attached to the opposite side, and the screw 8 cannot be moved beyond this range. Since this makes it impossible to perform idle adjustment after the initial stage, it is possible to accurately perform idle adjustment outside the specified rotation speed range. The throttle stop screw 8 can of course be moved forward and backward and can be adjusted to increase or decelerate.One side is regulated by a head 8a that is integrated with the screw 8, and the other is regulated by a circlip 12 attached to the screw 8. and its circlip 12 is easy to install but difficult to remove, which makes the screw 8
It is highly reliable as the regulations will be fixed almost permanently.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of an embodiment of the device according to the present invention, FIG. 2 is an enlarged sectional view of the main parts,
Figures 3a and 3b are a perspective view showing an example of a tool used to rotate the screw sleeve, and a sectional view showing the tool in use. 1... Carburetor body, 3... Throttle valve, 4...
... Valve stem, 5... Throttle lever, 8... Throttle stop screw, 8a... Head, 10...
Screw sleeve, 12...Circlip, 14
……dimple.

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 idling position of the throttle valve, wherein the throttle stop screw is screwed onto the screw sleeve; A screw sleeve equipped with the throttle stop screw is further screwed onto the carburetor body, and the throttle stop screw has a head that abuts on the throttle lever side;
and a clip attached to the side opposite to the head, and the throttle stop screw is configured to be movable forward and backward within the screw sleeve for a predetermined amount of deceleration and acceleration adjustment. Device.