JPH0341080Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an air intake system for a small engine, and more particularly to an air purifier and an air intake system with a simplified choke mechanism that is suitable for a small engine.

[Conventional technology]

A small gasoline engine, which is one type of internal combustion engine, is equipped with an intake system equipped with a choke mechanism to facilitate starting.A typical intake system is shown in Fig. 6. A filter element 13 is housed in a casing 10 formed by two shells 11 and 12, and
A rotary air vent valve 15 disposed in the casing 10 closes the outlet 14 formed in the casing 10 by operating the shell 11 and a lever 15a protruding outward from the window hole 11a of the shell 11. ing.

[Problem that the invention attempts to solve]

In the above-mentioned intake device, since at least two shells are connected, there are problems such as a complicated configuration of the connecting surface of the shells, and an air leak between the air vent valve and the sliding surface around the outlet 14 of the shell 11. In addition, the support structure for the internal filter element and air vent valve is complicated, and the air vent valve must be rotated. Since the yoke operation is performed by this, some kind of mechanism is required for positioning. Therefore, the configuration of the entire intake system becomes complicated, and precision is required in the manufacturing process, and even with precision machining, air leaks cannot be completely prevented, which poses a problem in the performance of the intake system. It was hot.

[Means to solve the problem]

Therefore, this invention aims to provide an intake device that has an extremely simple configuration and is free from air leaks.For this purpose, a choke plate with an intake hole that communicates with the intake hole of the carburetor body is arranged. , a filter element such as an elastic sponge is layered on this chiyoke plate,
The blowback prevention plate covering the front of the filter element slightly compresses the filter element.
The present invention is characterized in that it is attached to the carburetor body and configured so that the chain yoke plate can be moved linearly.

[Effect]

The intake system for small engines of this invention linearly moves the chiyoke plate which is supported by the elasticity given to the filter element.
The suction hole drilled in the choke plate and the intake hole of the carburetor body are made to communicate or are closed, and the elasticity of the filter element generates a frictional force between the choke plate and the carburetor body. In addition to holding the engine yoke position, the engine yoke plate is pressed against the carburetor to prevent air leaks.

【Example】

Examples of this invention are shown in Figures 1 to 5 below.
This will be explained using figures. First, in FIG. 1, reference numeral 1 indicates a carburetor body that is attached to the engine via an insulator (not shown), and approximately in the center of the carburetor body 1 is an intake hole 1a for introducing air to obtain an air-fuel mixture. It is worn,
Screw holes 1b for attaching a blowback prevention plate, which will be described later, are formed on both sides thereof, and the side surface 1c of the intake hole 1a on the inlet side is formed into a flat surface. A chiyoke plate 2 is movably arranged along the side surface 1c of the carburetor body 1. This cheese plate 2 is a rectangular plate material, and both ends thereof are bent at right angles to form a finger rest part 2a, and a stopper 2b which also serves as a rib is formed inside this finger rest part 2a. There is. The stoppers 2a, 2b can come into contact with the end face of the carburetor main body 1, and are dimensioned to allow linear movement of the yoke plate 2 by the stroke required to open and close the intake hole 1a. Ribs 2c are formed on both sides of the carburetor body 1 on the side opposite to the contact surface with the side surface 1c, and between the ribs 2c, a diameter of the intake hole 1a is formed at an offset position in the length direction. A suction hole 2d of equal or slightly smaller diameter is bored. A filter element 3 made of sponge with open cells is stacked on this cheese plate 2.
An air intake hole 3a having a size corresponding to the dimension of the side surface 1c of the carburetor body 1 and having the diameter of the intake hole 1a is bored in the center position, and air sucked in from the surroundings is drawn into the air intake hole 3a. It seems to be flowing towards the sky. On both sides of filter element 3,
Notch 3 into which the attachment part of the blowback prevention plate to be described later is fitted
b is formed. This filter element 3 is slightly compressed when it is attached, and is attached to the carburetor body 1 by means of a blowback prevention plate 4 that has the function of closing the air intake hole 3a. This blowback prevention plate 4
is the size that covers the front of filter element 3,
The side plates 4a, 4a which have an internal space and form this internal space are set to have a dimension smaller than the sum of the thickness of the filter element 3 and the thickness of the yoke plate 2, and are used to guide the linear movement of the yoke plate 2. It has both the function and the positioning function of the filter element 3, and its ends are bent outward to form mounting flanges 4b, 4b, and screw holes 4c are bored in these mounting flanges 4b, 4b. . An index 4d indicating the opening/closing operation direction is marked on the end of the blowback prevention plate 4 in a direction orthogonal to the side plates 4a, 4a.
This blowback prevention plate 4 is attached to the engine body by penetrating the attachment part between the carburetor body 1 and the insulator with screws 4e, and at this time, the filter element 3 is placed in a slightly compressed state and elastically pushes the yoke plate 2. I have it. Next, the operation of the intake system will be explained with reference to FIGS. 3 and 4. First, when starting the engine, the air mixture is enriched by blocking the air passage sucked into the carburetor body 1, and the engine engine plate 2 is moved in the closing direction by at least the diameter of the suction hole 2d. (in the upper part of the figure), the intake hole 1a of the carburetor body 1 and
The suction hole 2d of the yoke plate 2 is placed in a disconnected state. In this state, filter element 3
The air intake hole 3a of the carburetor body 1 and the intake hole 1a of the carburetor main body 1 are blocked by a choke plate 2, and operation is performed with a rich air-fuel mixture. When the warm-up operation etc. are completed, the air intake hole 3a of the filter element 3 is communicated with the intake hole 1a of the carburetor body 1 via the suction hole 2d by moving the check plate 2 in the opening direction. This allows air to be introduced from the outside of the element 3. The linear movement of the chain yoke plate 2 as described above is restricted by any one of the stoppers 2b hitting the carburetor body 1.

[Effect of the idea]

As is clear from the above description, in the intake system for a small engine of this invention, the choke plate is held in an elastic position by the filter element and can slide linearly, and the air intake between the filter element and the carburetor is Since the structure is such that the communication state with the hole is opened and closed, the structure is extremely simple, and since there is no gap where there is a risk of air leakage, there is an effect that the yoke performance is not deteriorated.

[Brief explanation of the drawing]

The attached drawings show an embodiment of this invention, in which Fig. 1 is an exploded perspective view of the intake device, Fig. 2 is a longitudinal side view of the same,
FIG. 3 is a side sectional view of the yoke state, FIG. 4 is a side sectional view of the non-yoke state, FIG. 5 is a sectional view taken along the line shown in FIG. 4, and FIG. 6 is a schematic sectional view showing a conventional example. . 1... Carburetor body, 1a... Intake hole, 1b
...Screw hole, 1c...Side surface, 2...Chewing plate, 2a...Finger rest, 2b...Stopper, 2
c...Rib, 2d...Suction hole, 3...Filter element, 3a...Air intake hole, 3b...Notch, 4...Blow back prevention plate, 4a...Side plate, 4b...
...Mounting flange, 4c...screw hole, 4d...index.

Claims (1)

[Scope of utility model registration request] In an intake system for a small engine that is equipped with a filter element in the intake hole of the carburetor and is configured to perform a check by adjusting the opening of the intake hole of the carburetor, the check-yoke plate has an intake hole that communicates with the intake hole of the carburetor, and this check-yoke. A filter element made of sponge that can be stacked on the plate,
a blowback prevention plate that covers the front surface of the filter element and is fixed to the carburetor with the filter element in a compressed state; Can slide in a straight line,
An intake system for a small engine, characterized in that the filter element and the carburetor are configured to open and close communication with an intake hole.