JPS647235Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is based on a sliding cylinder with a bottom that is movable in a direction across the intake passage installed in the carburetor body and constitutes a variable bench lily. Regarding a sliding throttle valve type carburetor having a throttle valve, in particular, the sliding throttle valve constitutes a variable bench lily in response to intake tract negative pressure obtained from a negative pressure introduction hole provided at the bottom thereof. The present invention relates to a sliding throttle valve type carburetor of the above type.

<Prior Art> Conventionally, in such a sliding throttle valve type carburetor, the upper end of the sliding throttle valve is connected to a diaphragm device, and the negative pressure introduction hole provided at the bottom of the sliding throttle valve is connected to a diaphragm device. By supplying the intake passage negative pressure obtained from the diaphragm device to the diaphragm device, the sliding throttle valve is driven to form a variable bench lily. Therefore, some of the mist-like fuel discharged into the intake tract may enter the sliding throttle valve, and if the fuel reaches the diaphragm device or accumulates inside it,
Problems such as impairing the dynamic function of the diaphragm device and deteriorating certain members may occur.

<Problems to be solved by the invention> In view of the drawbacks of the prior art, the main purpose of the present invention is to provide an improved sliding throttle valve that prevents fuel from reaching the upper part of the sliding throttle valve. Our goal is to provide a type of vaporizer.

<Means for Solving the Problems> This purpose of the present invention is characterized by providing a baffle plate that separates the inside of the sliding throttle valve vertically with a relatively small gap. This is achieved by providing a sliding throttle valve type carburetor of the type described above. In particular, it is preferable to form the baffle plate on a retainer that holds the jet needle.

<Function> In this way, if a baffle plate is provided to separate the upper and lower parts of the inside of the sliding throttle valve, even if mist-like fuel enters the inside, it will be difficult to rise, and it will settle downward due to gravity, causing negative pressure. It is returned to the intake passage through the introduction hole. By forming a baffle plate on the retainer, the structure can be simplified.

<Embodiments> The present invention will be described in detail below with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows in its entirety one embodiment of a sliding throttle valve type carburetor according to the present invention. 1st
In the figure, 1 indicates a carburetor main body, and the carburetor main body 1 has an intake passage 2 extending in the horizontal direction. The carburetor body 1 includes a bottomed cylindrical sliding throttle valve 3.
is provided so as to be movable in a direction across the intake passage 2, and the sliding throttle valve 3 protrudes into the intake passage 2 through a receiving hole 4, and a bottom wall 5 forming the tip thereof.
A variable bench lily portion 6 is formed between the intake passage 2 and the inner wall of the intake passage 2 facing thereto.

The carburetor body 1 is provided with a needle jet 7 that is attached to a position facing the bottom wall 5 of the sliding throttle valve 3 and opens into the intake passage 2. It communicates with the float chamber 10 through an air bleed tube 8 attached to the air bleed tube 8 extending vertically thereto and a main fuel jet 9 attached to the lower end of the air bleed tube 8.

A throttle valve 12 for controlling the amount of intake air mixture is provided on the downstream side of the variable bench lily portion 6 in terms of the intake air flowing through the intake passage 2 and is rotatably supported with respect to the carburetor body 1 by a valve shaft 11. It is being

In the carburetor main body 1, an intake passage 2 is installed at a position downstream of a throttle valve 12 which is at an idle opening position as shown in the figure when looking at the intake air flowing through the intake passage 2.
An idle port 13 opened to the intake passage 2 is provided, and a slow port 14 opened to the intake passage 2 at a position corresponding to the vicinity of the outer peripheral edge of the throttle valve 12 at the idle opening position. 14 communicates with the float chamber 10 via a slow fuel passage 15 provided in the carburetor body 1 and an air bleed tube 16 which also serves as a slow fuel jet.

The float chamber 10 is composed of a carburetor body 1 and a float chamber case 17 attached to the outer wall of the carburetor body, and a float (not shown) that controls the opening and closing of liquid fuel such as gasoline from a fuel inlet 18. It is supplied via a valve 20 and is adapted to store a fixed amount of liquid fuel.

The sliding throttle valve 3 is connected to a diaphragm 22 of a diaphragm device 21, and increases the spring force of a compression coil spring 24 in response to an increase in the negative pressure introduced into a diaphragm chamber 23 defined upward in the diagram of the diaphragm 22. The variable bench lily portion 6 is displaced upwardly in the figure against the pressure, thereby enlarging the variable bench lily portion 6.

A diaphragm chamber 25 defined downward in the diagram of the diaphragm 22 is connected to the intake passage 2 by a port 26.
The upstream side of the diaphragm chamber 23 is almost open to the atmosphere, and the diaphragm chamber 23 receives bench lily negative pressure from a negative pressure introduction hole 40 provided in the bottom wall 5 of the sliding throttle valve 3 and opened in the variable bench lily portion 6. supply is becoming available. Therefore, the sliding throttle valve 3 is displaced upward in the figure against the spring force of the compression coil spring 24 in response to an increase in the negative pressure of the bench lily, that is, in response to an increase in the amount of intake air, and the variable bench lily portion 6 will be enlarged.

A jet needle 27 is attached to the sliding throttle valve 3. As clearly shown in FIGS. 1 and 5, the jet needle 27 passes through a through hole provided in the center of the bottom wall 5 of the sliding throttle valve 3 and projects into the intake passage 2. It is adapted to be axially movably fitted within the needle jet 7 and air bleed tube 8, and cooperate with the needle jet 7 to control the fuel flow rate from the needle jet. The protruding base end of the jet needle 27 is located within the cylinder of the sliding throttle valve 3, and a flange member 27a is fixed to the protruding base end by appropriate means such as caulking. The jet needle 27 is prevented from coming off downward by engagement between the flange member 27a and an annular seat portion 3a formed protruding inside the bottom wall 5.

A cylindrical portion 28 is formed in the sliding throttle valve 3 so as to protrude from the bottom wall 5 concentrically with the through hole, and the opening edge at the upper end of the cylindrical portion has a cylindrical portion 28 extending radially inward from the opening edge. Two protruding tongue-shaped locking pieces 28a are provided spaced apart from each other in the circumferential direction (FIGS. 3 and 5).

A cylindrical retainer 29 is inserted into the cylindrical portion 31 . As clearly shown in FIGS. 2 to 5, the lower portion of the retainer 29 includes a locking flange piece 32 that selectively engages with the undercut surface of the locking piece 28a. A bottom flange piece 31 that joins to the bottom wall 5 is provided, and on the upper surface of the locking flange piece 31, the lower surface of the locking piece 28a,
That is, by engaging with the undercut surface, the sliding throttle valve 3 is sandwiched between the locking piece 28a and the bottom wall 5.
Fixed to . A compression coil spring 36 is provided in the lower cylinder of the retainer 29 (the fifth
(Fig. 6), the compression coil spring is connected to the retainer 2
The jet needle 27 is provided between the downward facing surface in the lower cylinder of the cylinder 9 and the flange member 27a, and urges the jet needle 27 in the projecting direction, that is, downward in the figure.

As clearly shown in FIGS. 3 and 5, the locking flange piece 34 and the bottom flange piece 35 of the retainer 29 each have a shape in which diagonal positions of a circle are cut out parallel to each other. .

Insertion of the retainer 29 into the cylindrical portion 28 is as follows:
Locking flange piece 32 and bottom flange piece 3
After the retainer 29 is inserted into the cylindrical portion 31 beyond the locking piece 28a by the cutout, the retainer 29 is inserted at a predetermined angle, e.g. By being rotated 90 degrees, the upper surface of the locking flange piece 32 engages with the undercut surface of the locking piece 28a, as clearly shown in FIGS. 6 and 7. , it is becoming more and more difficult to get out of the way.

Further, as shown in FIGS. 2 to 5, a sliding throttle valve 3 is provided on the upper part of the retainer 29.
Disc-shaped flanges 33 and 34 having outer diameters that are very slightly smaller than the inner diameter of the flange portions 33 and 34 are integrally connected vertically. A cut surface 33 formed by cutting off a portion of the outer periphery of each of these flange portions 33 and 34 so as to be located diagonally to each other at one location.
a, 34a. Therefore, the sliding throttle valve 3
The inside of the cutout surfaces 33a, 34a and the sliding throttle valve 3
The inside of the sliding throttle valve 3 is separated vertically by leaving a gap defined by the inner circumferential wall surface of the sliding throttle valve 3.
The fuel that has entered the sliding throttle valve 3 through the negative pressure introduction hole 40 can reach the upper part of the sliding throttle valve 3 only after passing through the passage bent by both the flange parts 33 and 34, and most of the fuel is not able to reach the upper part of the sliding throttle valve 3 due to gravity. dynamic throttle valve 3
, and is returned to the intake passage 2 through the negative pressure introduction hole 40 by the suction action of the intake passage negative pressure.

A hexagonal portion 35 is provided at the center of the upper flange portion 33, with which a tool for rotationally displacing the retainer 29 is engaged when the retainer 29 is assembled. Further, a locking hole 38 that can be engaged with a cross-shaped screwdriver is provided inside the locking hole 35, and the retainer 29 can also be assembled using this locking hole 38. Further, on the outer periphery of the retainer 29 above the locking flange piece 32,
In order to fix the retainer 29 in a rotational position where the locking flange piece 32 engages with the locking piece 28a, a pair of anti-rotation protrusions 36 sandwich the locking piece 28a from both sides thereof. , 37 are provided.

At this time, two bulges are provided at diagonal positions on the upper surface of the locking flange piece 32 so that the retainer 29 is positively held by the locking piece 28a. The portion 28a may elastically hold the locking flange piece portion 32 and the retainer 29 itself downward by the action of the bulging portion.

The preferred embodiment of the present invention has been described above,
The present invention is not limited to the above. For example, the partition wall constituting the baffle plate can be made of a separate member from the retainer, and in that case, such a partition wall can be configured freely regardless of the structure of the jet needle or the structure of the retainer. Benefits can be obtained.

<Effects of the invention> As described above, according to the invention, even if fuel enters the sliding throttle valve from the negative pressure introduction hole, it will not reach the upper part of the sliding throttle valve or the diaphragm device. Inconveniences such as damage to the function of the diaphragm device due to intrusion can be effectively avoided. In particular, if the baffle plate is integrally formed with the retainer for holding the jet needle, the manufacturing and assembly process can be significantly simplified.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the entirety of one embodiment of a sliding throttle valve type carburetor according to the present invention. FIG. 2 is an enlarged vertical front view showing the retainer shown in FIG. 1 in detail. FIG. 3 is a sectional view taken along the line - in FIG. 2. FIG. 4 is a plan view of FIG. 2. FIG. 5 is an exploded perspective view showing the main parts of the sliding throttle valve type carburetor according to the present invention shown in FIGS. 1 to 4. FIG. 6 is an enlarged longitudinal sectional view showing the main part of FIG. 1. Figure 7 is the 6th
7 is a view similar to FIG. 6, shown longitudinally along a plane that differs by 90 degrees from the longitudinal section of the figure; FIG. DESCRIPTION OF SYMBOLS 1... Carburetor body, 2... Intake path, 3... Sliding throttle valve, 3a... Annular seat, 4... Hole, 5... Bottom wall, 6... Variable bench lily part, 7... Needle Jet, 8... Air bleed tube, 9... Main fuel jet, 10... Float chamber, 11...
... Valve shaft, 12 ... Throttle valve, 13 ... Idle port, 14 ... Slow port, 15 ... Slow fuel passage, 16 ... Air bleed tube, 1
7...Float chamber case, 18...Fuel inlet, 1
9...Float, 20...Float valve, 21...
Diaphragm device, 22...Diaphragm, 23
...Diaphragm chamber, 24...Compression coil spring,
25...Diaphragm chamber, 26...Port, 27
... Jet needle, 27a ... Flange member, 28 ... Cylindrical part, 28a ... Locking piece part, 29
... Retainer, 30 ... Compression coil spring, 31,
32...Locking flange part, 33, 34...Flange part, 33a, 34a...Removed surface, 35...Hexagonal part, 36, 37...Rotation stopping protrusion, 38...
Engagement hole, 39...hexagonal part, 40...negative pressure introduction hole.

Claims (1)

[Claims for Utility Model Registration] A device that is movable in a direction across the intake passage installed in the carburetor body and is variable in response to the intake passage negative pressure obtained from the negative pressure introduction hole provided at the bottom of the carburetor body. In a sliding throttle valve type carburetor equipped with a bottomed cylindrical sliding throttle valve constituting a bench lily, the interior of the sliding throttle valve is arranged at intervals in the axial direction of the sliding throttle valve. The top and bottom are separated by a baffle plate consisting of a pair of flanges.
and the flanges are adapted to hang from the bottom of the sliding throttle valve to hold the jet needle, which is supported so as to be loosely inserted into a fuel nozzle that opens toward the intake passage so as to face the bottom. A sliding throttle valve type carburetor, characterized in that the carburetor is integrally formed with a retainer installed in the sliding throttle valve, and has cutout portions formed at positions that do not align with each other on the circumferential edges of both flanges.