JPS58195052A - Variable venturi carburetor - Google Patents

Abstract

PURPOSE:To improve the acceleration performance and output performance by energizing a negative pressure sliding throttle valve in the closing direction through a damper spring thereby preventing the abrupt lifting of said valve and eliminating dilution of mixture gas. CONSTITUTION:Upon abrupt opening of a throttle valve lever 14 to accelerate quickly, a throttle shaft 13 will rotate to remove a stopper between a stopper pin 22 and said lever 14 thus to release the press down force against a negative pressure sliding throttle valve 4 thereby only the press down force due to energizing of a damper spring 20 is applied on said valve 4. Upon abrupt opening of said lever 14, said valve 4 will lift slowly to open the Venturi section slowly resulting in the improvement of acceleration performance and output performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The 15101 bench nose type vaporizer 11 of the present invention is further characterized in that the bench m
The variable throttle type vaporizer has a negative pressure sliding throttle valve that variably controls the IJ surface, and the negative pressure me and the operating stroke of the throttle valve are controlled by a throttle valve lever provided in the negative pressure chamber. Concerning the improvement of utensils.

Conventionally, when the throttle valve lever is opened in the first stage of variable bench x IJ type vaporization as described above, the negative pressure sliding throttle valve is released from the pressing blade, and the structure is such that it opens and closes depending on the pressure difference between the upper and lower sides. There is. Therefore, when the throttle valve lever is suddenly opened, if strong negative pressure is acting in the negative pressure chamber at that time, or if the negative pressure sliding throttle valve itself is lightweight, the negative pressure sliding throttle The valve suddenly opens the venturi section, and the air flow increases, but the fuel is delayed and the mixture becomes lean temporarily, which can easily cause engine knock or so-called engine sluggishness. However, there was one case in which the acceleration was poor and the expected output was not obtained.

Since this was made in view of the above points,
The variable venturi type carburetor as described above is characterized in that a damper spring disposed in the negative pressure chamber biases the negative pressure sliding throttle ff in the fully closing direction, and its purpose is to When the lever is suddenly opened, the negative pressure sliding throttle valve should be raised slowly without causing a sudden rise, and the mixture, , 1', may be diluted. The purpose is to obtain the desired acceleration performance and output performance.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a carburetor main body through which an airway 2 penetrates, a guide cylinder 3 is formed above the intake path 2, and a negative pressure slide 1. The touch valve 4 is slidably arranged. A jet needle S is supported at the lower part of the negative pressure sliding throttle valve 4, and this jet needle 5 is inserted into a two-torque gasket 6 to form a fuel discharge gap. On the other hand, there is a diamond 7 ram 7 on the top of the negative pressure sliding grade valve 4.
is attached, and this diaphragm 7 has vertical and negative pressure 8
and an atmospheric chamber 9 are formed separately, and an air intake passage 2 is formed in the negative pressure chamber 8.
Is the negative pressure inside negative pressure slide 1 throttle valve 4? Negative pressure passage 10
, 10, and the atmospheric air is introduced through the atmospheric chamber 9KF1 through the atmospheric air introduction passage 11.

11 On the 1s- side of the top cage 12 where the negative pressure *s' was formed, there is a flat shaft 13 rotatably □
□, 3=1:・7°211. A, 1,300, □'1゜p The base S of the valve bar 14 is rotatably attached, and its tip is brought into contact with the top 15 of the negative pressure sliding throttle valve 4. The lever part 14 is made up of a plate body in which a long piece 16 and a short piece 17 are connected in a planar shape, and a cylindrical body 19 is attached to a plate body 18 that is connected to the end of the short piece 17, and the short piece 2 is parallel to the lever part 14. The cylindrical body 19 of the mounting part 14J is mounted on the throttle shaft 7) 13 so as to be rotatable. Then, one end of the damper spring protruding from the outside of the cylindrical body 19 forming the mounting portion 144 of the throttle valve lever 14 is hooked to the medullary edge of the short piece 17 of the lever portion 14a. By hooking the other end to the inner wall of the casing 12, when the throttle valve lever 14 is biased in the direction of the arrow 21, #1 of the throttle shaft 13 @I! The stopper hinge n protruding from the throttle valve lever 14 is brought into contact with the edge of the short piece 17 forming the lever straddle 14, thereby restricting the rotation of the throttle valve lever 14 in the direction of the arrow n. It is like π. In the above throttle shirt) 1301
1. The spring constant is connected to a rotating axle (not shown) and operated cold and controlled via the bar body. 2. Also, the ship spring constant is the negative pressure applied to the negative pressure sliding throttle valve 4. The power should be installed at a distance that does not cancel out the rising force caused by the rise.

In the above-mentioned variable bencheri type carburetor, the negative pressure generated in the airway 2 when the engine rotates is led to the negative pressure chamber 8 via the negative pressure passage 10°IO, and the pressure is applied to the negative pressure chamber 8 and the atmospheric chamber 9. V is generated, and the reconnaissance sliding throttle valve 4 gradually rises. This rising negative pressure slide expansion continues until the downward force due to the weight of the inner body of the throttle valve 4 and the upward force due to the pressure difference are balanced, and the throttle valve lever 14 is moved to a position below gI where this balance is achieved. If you set the opening so that the position is negative, it will stop at that position. If the throttle valve bar 14 is further opened from an arbitrary state, the negative pressure sliding throttle valve 4II'i is further raised, the bench area and the fuel discharge distance [11] are increased, and the engine is accelerated. Conversely, if the throttle valve lever 14 is moved to close from any of the above-mentioned states, the negative pressure sliding throttle valve 9 valve 4Fi is forcibly lowered to achieve deceleration.

The present invention exhibits the following characteristics in the above-described operation. That is, it is assumed that the throttle valve lever 14 is now in the closed position as shown in the first figure, and the negative pressure slide 1 throttle valve 4 is in the low opening position 11. Let us consider the case where a sudden opening operation is performed. In this case, the throttle valve lever 13 first rotates and the stopper bottle n and the teaching valve lever 14 are unlatched, and the throttle valve lever 14
Negative pressure P/4 bird 1 was applied from Slo-F Rusha 7th eye 3 through. $9? '1 The pressing blade for valve 4 is released.
1. Negative pressure sliding throttle valve 4KFi only the pressing blade is applied by the urging force of the damper. In this case, if a strong negative pressure is introduced into the negative pressure i1B, the negative pressure slide IEl comparison valve 4
Fi is about to rise rapidly, but the pushing blade is added by the urging force of the Danvers 7 rejuvenation (so it rises slowly without rising rapidly.The gradual cooling opening operation is caused by the negative pressure sliding valve 199). 4 top 15 and throttle valve lever 1
4 is always in contact with the lever s14 of the turning valve lever 14 (I). 1゛□□ When the throttle valve lever 14 is suddenly opened and swept in this way, the rise of the negative pressure sliding throttle valve 4 is made slow and the bench crease is gradually opened, so there is no damage to the engine. In addition to allowing the required amount of air to flow in, it is also possible to allow fuel to flow in by causing a flycatcher to flow.

When decelerating, the stopper pin 4 of the throttle shaft 13 and the throttle valve lever 14 collide with each other, so the throttle valve lever 14 rotates in the closing direction as the throttle shaft rotates 130 times. At the same time, the negative pressure sliding throttle valve 4 is also pushed down, and the throttle valve lever 14 and the negative pressure sliding throttle valve 4 operate integrally.

Next, the example company shown in Fig. 113, throttle shaft 7) 1
The tie-dye valve lever 14 is rotatably attached to 3, and the rotation of the valve lever 14 in the opening direction is limited by the stopper bottle protruding from the throttle shirt 13, and the %) tup nursing 12 and Mce valve are /(-14 Ruba part 14・
There is a KK damper spring section between the two.
"'i:: eo*"'"Kk vomit 1"l, -%-141'jiiM
When sweeping, the throat shaft 13 also releases the pressing blade applied to the negative pressure sliding throttle valve 4 via the valve lever 14, and the Danvers 7 ring is applied to the negative pressure sliding throttle valve 4. Only the pushing blade is applied due to the biasing force of the muscle. Therefore negative pressure N
Piece number valve 4#1m [IE and the same IIAK slowly rises, and when the valve is opened and the required amount of air flows in, the valve follows this and the fuel also flows in. If the slit shaft [13 is rotated in the closing direction to reduce Zln, the throttle shaft +-y to 1sK9! [Since the stopped stopper -n and the throttle valve lever 14 collide with each other, the throttle valve lever 14 also moves in the closing direction.
Accordingly, the noble pressure slide 11J and relief valve 4 are lowered.

In the above two embodiments, the Danvers 1 ring 20 is rotatably attached to the safety throttle valve lever 141 and the throttle lever 7) 13 and urges the negative pressure sliding throttle valve 4 in the closing direction.
The force behind the death is the shibori lever! In the embodiment shown in FIGS. 4 and 4, the base of a part of the throttle valve lever is fixed to the throttle shaft 7) 13, while the cap FJ-, the slide 11+ A damper spring r that biases the throttle valve 4 in the closing direction is provided with the negative pressure slide 1/throttle valve 4, top cage jig 120, and 01RK. That is, a rib-like four-piece part n is formed on the upper surface of the negative pressure sliding throttle valve 4, and four protrusions are formed on the lower surface of the top plate of the totsubu nursing 12, facing the vi-annular part. 1111IK is vertically installed in a position that does not hinder the rotation of a part of the relief valve lever,
A seat for the damper spring 27 is formed, and the tambour spring 27 is installed between the bottom of the annular recess and the lower end of the screen frame. The spring constant of the damper spring in this case is also such that it can give a one-ton action as in each of the above embodiments, and cancels the upward force caused by the negative pressure applied to the negative pressure sliding throttle valve 4 tE'& Set to a high degree.

In this example, if the company, the choking valve, and the bar name are expanded,
At the same time as the throttle shaft 13 rotates, the throttle valve lever suddenly opens in one direction, but the pressure slide 1F1M valve 4F!
Since the damper spring is pressed down by a nail, its rise is done slowly.Therefore, the required amount of air as well as the amount of fuel that follows the damper spring are forced to flow into the engine. a. Throttle shaft 13 and aperture*
Since the valve lever n is fixed, both members operate integrally, and at the same time, the negative pressure sliding throttle valve 4 also closes.

In addition to this embodiment, the throttle shaft 13 and the throttle valve lever lever are rotatably connected as in the embodiment shown in FIG. Needless to say, the same effect can be achieved by aligning the valve levers and restricting the rotation of the throttle valve lever in one direction.

That’s all! As is clear, the present invention has a negative pressure sliding plate valve that device-controls the bench & lJ area according to the air flow rate flowing through the intake tract, and also has an operating stroker of the experimental negative pressure sliding in valve inside the negative pressure type. In the carburetor, the negative pressure t should be controlled by the lever.
IIIl# Since the shark valve is placed in a negative pressure type and biased towards the closing valve by a damper fling, in order to achieve a sudden acceleration state of 11, the throttle valve lever 111 *1kWkn L****M... (Dh*FJ:, W
Even if IWc*VltFE is introduced), the H of Tanhaasbrinda will not suddenly increase the number of pieces per slide.
Since it is gradually raised by e force and gradually opened 17 parts, it is possible to reduce the pressure and some of the sluggishness.
This has the effect of slowing down the engine speed and maintains the acceleration performance of the engine.

[Brief explanation of the drawing]

The accompanying drawings show embodiments of the present invention, and FIG. 1 is a vertical sectional side view of the first embodiment, FIG. 2 is an enlarged perspective view of the main part of the first embodiment, and FIG. J is the vertical side of the second embodiment, @J1,
FIG. 4 shows the longitudinal section 1ii11! of the third embodiment. H, supply 5 figure shows the same <wS3 actual & side, I of the throttle valve lever and protrusion
02 is a partial cross-sectional view showing the fI section...Intake path 4...Negative pressure sliding throttle valve 8...Precious pressure chamber 12...Top Casing 13... Throttle shaft 14, 26... Throttle valve lever 11, 20, 25, 27... Damper spring:':1...:.・ ″″′1 Figure 4

Claims (1)

[Scope of Claims] (1) It has a negative pressure sliding throttle valve that variably controls the inch-trimmed area according to the air flow rate flowing through the intake passage, and 1) the operating stroke of the negative pressure sliding throttle valve is set to a negative pressure. In a bench-type carburetor, which is controlled by a throttle valve lever installed indoors, the negative pressure sliding throttle valve is placed in a negative pressure chamber.
．． Closing direction with damper spring Kftft-1111
Negative pressure when operating 11! A usable benzamari-type carburetor characterized by a gradual opening of the M-operated throttle valve. (2) The damper spring company mentioned above has a throttle valve lever mounted on a rotatable throttle shaft, and the negative pressure sliding throttle valve is biased in the closing direction via the throttle valve lever. 8(3) The damper spring is installed between the pressure chamber and the valve lever that constitute the negative pressure chamber, and The variable Pente & IJ type vaporizer according to claim 1, wherein the pressure sliding throttle valve is biased in the closing direction via the throttle valve lever (4) The above-mentioned Danvers 7 line valve, negative pressure The claim is that the valve is installed between the top casing constituting the chamber and the negative pressure sliding throttle valve, and the negative pressure sliding throttle valve is directly biased in the closing direction by the Danvers 7 cylinder. The rotating pliers island type vaporizer according to item 1.