JPS6336055A - Two-stage carburetor - Google Patents

Abstract

PURPOSE:To keep venturi tubes warm and favorably keep the atomized condition of fuel in said venturi tubes by surrounding the opening frames of the inlet side and outlet side of plural venturi tubes with installing outer frames and forming warming spaces between these frames. CONSTITUTION:A two-stage carburetor 10 consists of plural carburetors which are connected in an alignment in the width direction and plural venturi tubes 11, 12 are provided mutually steppedly in parallel on its center part. And, the opening ends of the inlet side and outlet side of the venturi tubes 11, 12 are formed as the installing opening frame 11a, 12a and 11b, 12b to engine cylinders etc. In this structure, installing outer frames 13, 14 for installing venturi tubes to cylinder intake ports etc. are provided on the outside of the installing opening frames, on an oval frame. And, warming spaces 15, 16 are provided in between the installing opening frames and the installing outer frames respectively. Thereby, the venturi tubes can be kept warmed by means of air inside the warming spaces.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technology applied to a two-stage carburetor in which two venturi tubes are arranged in parallel.

[Prior Art] Conventionally, a two-stage carburetor in which two venturi tubes are arranged in parallel has been known.

[Problems to be Solved by the Invention] However, in cold regions, the air passing through the Venturi tube is affected by the wind passing through the outer wall of the Venturi tube during travel, and cools down midway.As a result, the two-stage type There was a problem in that the atomization state of the fuel liquid within the venturi pipe of the carburetor became unstable.

[Purpose of the Invention] This invention was made to solve the above problems, and it improves the heat retention of the venturi pipe to reduce the influence of outside air, and makes it possible to atomize fuel liquid inside the venturi pipe even in cold regions. The purpose of the present invention is to provide a two-stage vaporizer that can be maintained in good condition.

[Means for Solving the Problems] The present invention was made to solve the above problems, and in a two-stage carburetor in which two Venturi tubes are arranged in parallel, For installation on the inlet side, the opening frames are mutually connected, and for installation on the exit side, the opening frames are surrounded by an outer frame for the approximately elliptical installation that circumscribes each other, and for installation on the inlet side and outlet side of the two venturi tubes, the opening frames are surrounded by an outer frame. The above-mentioned mounting has a structure in which a space for heat insulation is provided between the outer frame and the outer frame.

[Even while driving, the two venturi tubes installed on the inlet side retain heat by trapping air in the heat-retaining space between the opening frame and the outer frame, making it ideal for use in cold regions. It works to maintain a good atomization state of the fuel liquid within the venturi pipe even while driving.

[Example 3] What is shown as a side view in FIG. 3 is a motorcycle 1 to which a two-stage carburetor 10 according to the present invention is applied.

A two-stage carburetor 10 is attached to a cylinder 3 that constitutes a combustion chamber of an internal combustion engine 2 of this motorcycle 1.

As shown in FIG. 1, this two-stage carburetor 10 is formed into a unit by connecting a plurality of them in the width direction.

A venturi pipe 11 of a small diameter, which mainly operates at low speeds of the internal combustion engine 2, is installed approximately in the middle of each two-stage carburetor 10.
and a large-diameter Venturi tube 12 that mainly operates at high speeds are arranged parallel to each other in different stages.

The opening ends of the inlet and outlet sides of the venturi tubes 12 and 11 are as shown in FIG. 2 (only the cross section on the side of the large-diameter venturi tube 12 is shown).

An opening frame 12a (lla) is installed to the cylinder 3 of the internal combustion engine 2 or the air cleaner (not shown) by protruding outward so that the end faces of adjacent ones coincide with each other.
, 12b (llb).

These protruding attachments are attached to the opening frames 11a, 12a and ll.
b and 12b are in contact with each other, and the figure 8-shaped mounting forms a frame. These "8" shaped mountings are provided on the outside of the opening frames 11a, 12a and llb, 12b, with venturi pipes 11 attached to the intake port of the cylinder 3 and an air cleaner (not shown) in a state circumscribing them, respectively.
12 together, the outer frame 13.14 (
1 and 2) is provided in a substantially oval frame shape.

And, each "8" shaped mounting is the opening frame 11a,
On the outside of 12a, llb, and 12b, an outer frame 13.14 (Fig. and Figure 2)
is provided on a substantially elliptical frame.

Then, the above-mentioned installation is performed on the opening frames 11a, 12a and Ilb.
, 12b and the mounting outer frames 13 and 14, as shown in FIG.
．． 16 are formed in total at a predetermined depth as shown in FIG.

The presence of these heat-retaining spaces 15.16 makes the inside of the venturi tube 11.12 less susceptible to the influence of outside temperature. For example, when driving in a cold region, heat retention is maintained by trapping air in the heat retention space 15.16, and as a result, the atomization state of the fuel liquid in the venturi pipe 11.12 is reduced. Well kept.

As shown in FIGS. 1 and 2, this two-stage carburetor 10 includes a butterfly valve 17 that adjusts the opening degree of the venturi tube 11, 12, and a piston valve 18 (of the small diameter venturi tube 11). A piston valve for adjusting the opening degree is omitted), a diaphragm chamber 19, a float chamber 20, and the like. In Figure 1, 21, 22.2
3 is a through hole for a mounting bolt (not shown).

[Effects] As described above, the two-stage carburetor according to the present invention has two venturi tubes arranged in parallel.
The two Venturi tubes are mounted on the inlet side with an opening frame, and the two venturi tubes are attached on the inlet side with an outer frame, and the two venturi tubes are attached with an outer frame, and the two venturi tubes are attached on the inlet side and outlet side. Since a heat-retaining space is provided between the opening frame and the outer frame for mounting, the heat-retaining space of the Venturi tube is maintained even when riding a motorcycle in cold regions by trapping air in the heat-retaining space. As a result, the inside of the venturi pipe does not get too cold, and the atomization state of the fuel liquid inside the venturi pipe is maintained in a good condition.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, of which FIG. 1 is a plan view of a two-stage carburetor according to the present invention. FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. 3 is a motorcycle to which the two-stage carburetor according to the present invention is applied. 10...Two-stage vaporizer, 11.12...Venturi tube, lla, 12a...Opening frame for inlet side installation,
llb, 12b...Exit side installation is opening frame, 13.1
4... Installation is an opening frame, 15.16... Space for heat insulation. Figure 1 of 111 n.

Claims (1)

[Claims] In a two-stage vaporizer in which two bench lily tubes are arranged in parallel, a substantially elliptical mounting outer frame that circumscribes the inlet side mounting opening frames and the outlet side mounting opening frames of the two bench lily tubes, respectively. A two-stage vaporizer, characterized in that a heat-retaining space is provided between opening frames on the inlet side and outlet side of the two bench lily tubes and the outer mounting frame.