JPH0326280Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides a screw member whose tip end surface comes into contact with a throttle valve lever that is biased in a direction in which the throttle valve of a carburetor closes to adjust the idling opening of the throttle valve.
An idling opening adjustment screw mechanism for a throttle valve supported by a support member that includes a support portion that is threadedly engaged with the threaded portion on the tip side of the screw member, and a support portion that is loosely engaged with the shank portion on the head side of the screw member. Regarding.

Prior Art Figures 4 and 5 show an idling opening adjustment screw mechanism of a throttle valve that has been actually used in the past with the above-mentioned configuration, and Figure 6 shows an actual throttle valve idling opening adjustment screw mechanism that is related to the technical concept of the present invention which will be described later. This figure shows the configuration of an idling opening adjustment screw mechanism for a sliding valve type carburetor that was disclosed in Publication No. 37-8701 but has not yet been actually used.

In FIGS. 4 and 5, reference numeral 1 denotes a screw member that adjusts the idling opening degree of the throttle valve, 2 a threaded portion provided on the tip side of the screw member 1, and 3
4 is the head of the screw member 1, and 4 is the shank portion of the screw member 1 on the head 3 side, that is, the unthreaded portion. Reference numeral 5 denotes a support member for the screw member 1, which is fixed to the carburetor body directly or via a connecting member 6. The screw member 1
For the positional relationship of the support member 5 with respect to the carburetor body, please refer to FIG. 1, which will be described later in the description of the structure of the present invention. The support member 5 has a support portion 7 that is screwed into the threaded portion 2 and a support portion 8 that is loosely engaged with the shank portion 4. I support it.
Further, a guide ring 9 is interposed in the support portion 8 of the screw member 1 which is loosely engaged with the shank portion 4, thereby determining the lateral position of the screw member 1.
If the lateral position of the threaded member 1 at this portion is not determined, the threaded member 1 will swing about the threaded portion as a fulcrum, and the position of the tip portion 10 that comes into contact with the throttle valve lever will also fluctuate, causing the idling of the throttle valve to change. Makes the opening unstable. Reference numeral 11 denotes a coil spring for preventing loosening, and in the configuration shown in FIG. The screw member 1 is disposed between the head 3 of the screw member 1 and the loose support portion 8. Although the configurations shown in FIGS. 4 and 5 can stabilize the idling opening of the throttle valve, a problem arises in that a guide ring is required and extra cost is incurred. Next, Jiko Sho 37
The prior art of the idling opening adjustment screw mechanism for a sliding valve type carburetor shown in FIG. 6, which is disclosed in Japanese Patent Application No. 8701, will be referred to. To summarize the configuration of Fig. 6, the tip of the idling opening adjustment screw (screw member) a is guided by the sliding portion b.There is a gap between the tip and the sliding portion b, so the tip position is not constant. Therefore, since the idling opening of the throttle valve c varies, the seat e of the locking spring d is inclined, and the tip of the idling opening adjusting screw a is moved in the direction of closing the throttle valve opening within the sliding part b. It's about sending. The biggest problem with the configuration shown in FIG. 6 is that the idling opening adjustment screw is subject to twisting at the threaded portion.

Purpose of the invention Even if the guide ring 9 used in the idling opening adjustment screw mechanism of the conventional throttle valve configuration shown in FIGS. 4 and 5 is abolished, the direction of the screw member 1 is fixed and stable idling can be achieved. It is an object of the present invention to provide an idling adjustment screw mechanism for a throttle valve that can adjust the opening degree.

Structure of the invention A threaded member is provided on the leading end side of the threaded member, the end surface of which comes into contact with a throttle lever that is biased in the direction in which the throttle valve of the carburetor closes, thereby adjusting the idling opening of the throttle valve. a support part formed by screwing with the threaded part and a support part by loose engagement with the shank part on the head side of the screw member, and a support part loosely engaged with the shank part; A locking coil spring is disposed between the head and the locking coil spring, and a contact surface between the locking coil spring and the support portion that loosely engages with the shank portion is inclined with respect to the screw member.

Embodiment Figure 1 shows the relationship between the carburetor body and the throttle valve lever of the first embodiment of the throttle valve idling opening adjustment screw mechanism of the present invention, and Figure 2 shows the idling opening adjustment screw mechanism of the throttle valve of the present invention. A second embodiment of the degree adjustment screw mechanism is shown, and FIG. 3 is a detailed explanatory diagram of the first embodiment. In FIG. 1, the numbers 1 to 8 and 10, 1
Reference numeral 1 indicates the same part as in FIGS. 4 and 5 showing the prior art, and 12 indicates a support portion 8 in which the support member 5 supports the shank portion 4 of the screw member 1 through loose engagement.
It is a through hole. 13 is a throttle valve lever; 14 is a return spring that biases the throttle valve lever 13 in the direction in which the throttle valve closes; 15 is the contour of the carburetor main body shown in chain lines; This is a cable that can be opened. In FIG. 1, the support member 5 supports the screw member 1 through screw engagement, and the support portion 7 is perpendicular to the screw member, whereas
The support 8, which supports the shank portion 4 of the screw member 1 by play, is inclined with respect to the screw member 1. That is, the angle indicated by θ in the figure forms an obtuse angle. Therefore, the locking coil spring 11 is compressed more strongly on the upper side than the lower side with respect to the screw member 1 in the figure, and a moment acts in the direction of the arrow 17, so that the screw member 1 is compressed against the inner periphery of the through hole 12. The direction of the screw member 1 is stabilized by being biased toward the lower end side of the surface, and the idling opening degree of the throttle valve is stabilized. The position of the through hole is given so that the threaded part 2 and the support part 7 which is screwed into the threaded part 2 are orthogonal to each other at this position. (Described later) In the second embodiment shown in FIG. 2, the angle θ is set to an acute angle so that the screw member 1 and the support portion 8 are inclined, and a moment 18 acts on the screw member 1, so that the screw member 1 is biased toward the upper end of the inner peripheral surface of the through hole 12, so that the direction of the screw member 1 is stabilized, and the idling opening of the throttle valve is stabilized. At this position, the through hole 1
2 positions are given. FIG. 3 is a partially enlarged view showing the relationship between the through hole 12 of the support part 8 and the screw member 1 in FIG. 1, and shows the locking coil spring 1.
It shows that the through hole 12 is eccentrically placed so that the support part 7 and the threaded part 2 are perpendicular to each other due to the biasing of the screw member 1 due to the imbalance of the compressive force of 1.
indicates the amount of eccentricity. 19 is the center line of the through hole 12.

Explanation of operation By the play of the support member 5, the contact surface between the support part 8 supporting the screw member 1 and the locking coil spring 11 is inclined with respect to the screw member 1, and the compressive force of the locking coil spring 11 is applied. By creating an imbalance and shifting the threaded member 1 toward the side with weaker compression force, the direction of the threaded member 1 and, therefore, the position of the tip end surface 10 are stabilized, and the throttle valve lever 13 and the threaded member 1 are stabilized.
It is possible to maintain the contact relationship with the tip surface of the throttle valve without changing, and to give reproducibility to the idling opening of the throttle valve, and the guide ring 9 shown in FIGS. 4 and 5 as the prior art is not required. Not only that, but the stability is even improved. The fundamental difference from the prior art disclosed in Japanese Utility Model Publication No. 37-8701 shown in FIG. In the configuration shown in Fig. 6, the idling opening degree is stabilized by twisting the threaded part, whereas in the present invention, the seat of the locking spring is inclined with respect to the threaded member, so that the threaded part is properly threaded. The point is that it can give

Effects of the invention: Due to the imbalance of the compression force of the locking coil spring, which causes the screw member to shift to one side, the conventionally used guide ring becomes unnecessary, which not only reduces costs, but also makes it possible to reproduce the idling opening. It has the effect of improving sexual performance.

[Brief explanation of the drawing]

Fig. 1 shows the relationship between the carburetor body and the throttle valve lever of the first embodiment of the throttle valve idling opening adjustment screw mechanism of the present invention, and Fig. 2 shows the second embodiment of the present invention. FIG. 3 is a detailed explanatory diagram of the embodiment shown in FIG. 1, and FIGS. 4, 5, and 6 show a conventional technology of the idling opening adjustment screw mechanism of the throttle valve. Explanation of symbols, 1... Screw member that adjusts the idling opening of the throttle valve, 2... Threaded portion, 3... Screw member 1
head, 4... shank portion of the screw member 1, 5... support member, 7... support part by screw engagement, 8... support part by loose engagement, 9... guide ring, 10... distal end surface, 11...
Locking coil spring, 12...Through hole, 13...
Throttle valve lever, 14...Return spring, 15...Contour of carburetor body, 16...Cable.

Claims (1)

[Scope of utility model registration request] A threaded member 1 whose distal end surface 10 comes into contact with a throttle valve lever 13 biased in the direction in which the throttle valve closes to adjust the idling opening of the throttle valve; and a threaded portion 2 on the distal end side of the threaded member 1. Support part 7 screwed together with
and a support member 5 that supports the screw member 1 by a support portion 8 that fits loosely with the shank portion 4 on the head side of the screw member 1, and the support portion 8 and the screw member that loosely fit together. In the idling opening adjustment screw mechanism for a throttle valve in which a coil spring 11 for preventing loosening is disposed between the head 3 of the throttle valve 1 and the head 3 of the throttle valve, the supporting portion 8 and the coil spring 11 are
An idling opening adjustment mechanism for a throttle valve, characterized in that a contact surface with the screw member 1 is inclined with respect to the screw member 1.