JPS6215474Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a throttle valve operating mechanism in a forced opening/closing type carburetor.

A conventional forced opening/closing type vaporizer is configured as shown in FIG. 1, for example. That is, throttle valve 2
is connected to an arm 5 fixed to a rotating shaft 4 via a connecting rod 3, and when the arm 5 rotates clockwise, the throttle valve 2 listens to the intake passage 6, and the arm 5 rotates in the opposite direction to the clockwise direction. When rotated, the throttle valve 2 closes the intake passage 6, and a rotating shaft 4 is rotatably supported by the carburetor body 1, and a wire drum 7 is fixed to the rotating shaft 4. . The tip of the support piece 8 fixed to the carburetor main body 1 is bifurcated, and one end of the pull-up side outer wire 9 is fixed to the end of one branch arm 8a, and One end of the return side outer wire 10 is fixed to the end 8b. A pull-up inner wire 11 and a return-side inner wire 12 are movably inserted into each of the outer wires 9 and 10, and one end of the pull-up inner wire 11 is connected to one side of the wire drum 7, wire 12
One end of each is attached to the wire drum 7 at a position facing (approximately diametrically) the above-mentioned one side. The other end of each inner wire 11, 12 is fixed to a rotatable operator 13, respectively. or,
An adjustment screw 14 is screwed onto the support piece 8 to limit the idle opening of the throttle valve 2, that is, the range of rotation of the wire drum 7 in the counterclockwise direction.

In the conventional forced opening/closing type carburetor configured as described above, when the operator 13 is rotated to pull the pulling-side inner wire 11 and the wire drum 7 is rotated clockwise, the The arm 5 rotates in the same direction and the throttle valve 2 is pulled upward to increase the area of the intake passage 6. Also, if the operator 13 is rotated in the opposite direction to the above case and the return side inner wire 12 is pulled, and the wire drum 7 is rotated in the counterclockwise direction, the arm 5 is rotated in the same direction via the rotating shaft 4. The throttle valve 2 is forcibly pushed down to reduce the area of the intake passage 6.

In such a conventional case, the wire drum 7 is forcibly rotated in the direction of closing the throttle valve 2, so if this operation is performed suddenly, the wire drum 7 closes the throttle valve 2 during rotation. Adjustment screw 14 for stopping at a predetermined idle opening position
As a result, a considerably large force is applied to the adjustment screw 14, the support piece 8, the wire drum 7, etc. Therefore, during long-term use, frequent operations of the operator 13 may cause the support part 8 to
Also, the adjustment screw 14, wire drum 7, etc. may be deformed, resulting in a safety problem.

The present invention was devised in view of the above-mentioned drawbacks, and its features are that the return side inner wire 1
2 is provided with a tension mechanism 21 which is always pressed against the return side inner wire 12 by a spring 18 to flex it, so that even when the operator 13 is suddenly operated in the direction of closing the throttle valve 2, the wire drum 7 can be adjusted. After it comes into contact with the screw 14 and stops at a predetermined position, even if the operator 13 is rotated further, the tension mechanism 21 reduces the operating force of the return inner wire 12, and the wire drum 7 and the support The purpose is to prevent excessive operating force from acting on the piece 8, adjustment screw 14, etc.

Hereinafter, the tension mechanism 21 according to the present invention will be specifically described based on the illustrated embodiment, using the same reference numerals for the same components as shown in FIG. 1. In the embodiment, a bracket 16 with a roller 15 rotatably attached to its tip is supported by a shaft 17 on the carburetor main body 1 or support piece 8, and the roller 15 attached to the tip of the bracket 16 moves in an arc shape. Further, the bracket 16 is urged by the spring 18 so that the roller 15 keeps the return side inner wire 12 under tension, and the roller 15 is pressed against the return side inner wire 12. The wire 12 is in a bent state.

Therefore, the operator 13 controls the throttle valve 2 in the high opening state.
After the wire drum 7 comes into contact with the adjusting screw 14 and stops during this operation, if an action in the same direction is further applied, the inner wire 12 on the return side will straighten out. As a result, the bracket 16 is pushed, and the bracket 16 rotates about the shaft 17 against the acting force of the spring 18, thereby reducing the operating force of the return inner wire 12.

FIG. 3 shows another embodiment of the tension mechanism 21, in which a slit hole 19 is formed in the support piece 8, and the rotating shaft 20 of the roller 15 is slidably attached to the slit hole 19 and returned. The rotating shaft 20 is biased by a spring 18 so that the side inner wire 12 is always kept in a bent and tensioned state, and the roller 15 is brought into pressure contact with the return side inner wire 12.

Therefore, when the operator 13 is operated to forcibly return the throttle valve 2, after the wire drum 7 comes into contact with the adjustment screw 14 and stops, it is pushed by the return side inner wire 12 and the roller 15 moves against the force of the spring 18, and the return side inner wire 12
Reduces the operating force of

In this way, in this invention, by operating the operator to pull the return side inner wire and forcibly rotating the wire drum, after the wire drum comes into contact with the adjustment screw and stops, the return side inner wire The tension mechanism absorbs the tensile force acting on the wire drum, support piece, adjustment screw, etc. even when the operator is operated suddenly, without applying excessive force to the wire drum, support piece, adjustment screw, etc. with each operation. Since these structural members do not deform, various problems associated with deformation of these members can be solved, and furthermore, it is possible to prevent the inner wire from breaking, which has practical advantages. It is beneficial.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal sectional view showing a conventional forced-open/close type carburetor, Fig. 2 is a side view showing the main part of an embodiment of the present invention, and Fig. 3 is a main part of another embodiment of the invention. The side view shown in FIG. 4 is a sectional view taken along the - line in FIG. 3. DESCRIPTION OF SYMBOLS 1... Carburetor main body, 2... Throttle valve, 7... Wire drum, 8... Support piece, 11... Pulling side inner wire, 12... Returning side inner wire, 1
4...adjustment screw, 15...roller, 18...spring, 21...tension mechanism.

Claims (1)

[Scope of utility model registration request] 1. A forced opening/closing type carburetor, characterized in that a tension mechanism is provided in the middle part of the return side inner wire, the tension mechanism being constantly pressed against the inner wire by a spring so as to flex it.