JP2509731Y2 - Air cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an air cleaner for a general-purpose internal combustion engine.

(Problems to be solved by conventional techniques and devices) General-purpose internal combustion engines are agricultural machinery, civil engineering machinery or portable generators.
It is used in many applications such as drive sources such as pumps.
Therefore, although various types of general-purpose internal combustion engines are provided,
A common need is a compact structure and easy maintenance. In particular, regarding the shape and structure of auxiliary equipment such as an air cleaner, it is an important point in the overall design whether or not it can be made compact and easy to perform maintenance without deteriorating its function.

In order to mount a general-purpose internal combustion engine so that the entire structure of the working machine becomes compact, for example, as shown in FIG.
There is one in which the cylinder 21 is inclined to lower the overall height of the engine (see Japanese Utility Model Laid-Open No. 59-62263). In the figure, 22 is a carburetor, 23 is an air cleaner, and 24 is a fuel tank. In this case, the air cleaner 23 is installed using the space above the cylinder 21, but since the space above is almost occupied depending on the shape of the fuel tank, the air cleaner is a fan housing, cylinder, carburetor, or the like. The layout must be designed so that it can be compactly stored under the fuel tank, taking into consideration the compatibility with other equipment.

By the way, as the shape of the air cleaner, there are many box-shaped ones as shown in FIG. 6 (see Japanese Utility Model Laid-Open No. 62-78361), and this box-shaped air cleaner 25 is shown in FIGS. 1 and 2. When the fuel tank 1 occupies the upper part and the cylinder 2 is attached to the carburetor 3 of the general-purpose internal combustion engine, the structure is as shown in FIG.

As shown in FIGS. 1 and 2, there are the recoil starter 4 and the fan housing 5 on the right side, and the projection amount of the air cleaner 25 from the recoil starter mounting surface 4a with respect to the fan housing 5 is too large as it is. , Second
In order to prevent the movement of the starting grip 6 of the coil starter operated in the direction of the arrow B in the drawing from being hindered, it is necessary to cut out the corner portion of the air cleaner 25 in FIG. 4 as shown by the broken line. However, in relation to other members, this may not be sufficient.

For example, as shown in FIG.
In a structure having a frame 28 at the corner (see Japanese Utility Model Laid-Open No. 56-29232), it is necessary to avoid interference with the frame. That is, since the frame 28 is located in the direction of attaching and detaching the cover of the air cleaner (the direction of arrow C in FIG. 4), the frame 28 becomes an obstacle even if the cover is to be removed for replacement of the elements of the air cleaner. In order to avoid this, the frame 28 must be subjected to an extra process of partially deforming it, or the frame size must be increased, which is the opposite of the compact design.

Further, if the cover is arranged so as to be removable so as to avoid interference with the frame, as shown in FIG. 5, the protruding amount of the air cleaner 25 from the recoil starter mounting surface 4a becomes large, and the operability of the recoil starter is increased. Deteriorate.

The present invention has been made in view of the above-mentioned problems of the conventional art, and an object thereof is to provide an air cleaner for a general-purpose internal combustion engine which is excellent in operability and maintainability and has a compact structure.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention arranges a cylinder in a tilted manner in a side view, and tilts the carburetor in a plan view so as to be separated from the fan housing side on the air cleaner side. In a general-purpose internal combustion engine in which a recoil starter provided on the side of the crank chamber projects in a direction wider than the cylinder portion in a plan view, and a fuel tank is provided from above the cylinder to above the crank chamber. In the air cleaner to be arranged, the air cleaner is placed in a space formed on a cylinder side of an imaginary plane extending the surface of the recoil starter at a corner portion on the recoil starter side of the cylinder upper part of the internal combustion engine, and Flat cutting so that the cover surface is parallel to the recoil starter mounting surface The element is configured as a trapezoid with a substantially sloping surface, and the elements are arranged at an angle that makes the angle between the carburetor mounting surface of the air cleaner body and the cover surface in plan view substantially equal. It is characterized in that a mating surface between the air cleaner body and the cover of the air cleaner is provided substantially in parallel.

(Operation) Then, the air cleaner having the above-described configuration has the following operations. That is, the air cleaner is formed in a corner of the upper part of the cylinder of the internal combustion engine on the recoil starter side in a space formed laterally from the upper part of the cylinder to the base end of the cylinder on the cylinder side of a virtual plane extending the surface of the recoil starter. Can be stored compactly, and
The air cleaner cover surface is parallel to the recoil starter mounting surface, and the flat cross-section is a trapezoid with a substantially beveled angle. You can Therefore, even when operating the recoil starter, it does not interfere with the operation of the starting grip. Further, as described above, the elements are arranged at an angle such that the angle formed by the carburetor mounting surface of the air cleaner main body and the cover surface of the air cleaner in plan view is substantially equal, and therefore the elements are substantially equal on both sides of the element. Since the space is formed, the function of the air cleaner body is not hindered. Furthermore, since the mating surface of the air cleaner body and the cover of the air cleaner is provided substantially parallel to the elements arranged as described above,
The air cleaner cover can be inserted and removed in a direction perpendicular to the recoil starter mounting surface. Therefore, even when mounted on an engine generator or the like having a frame, there is generally no obstacle in the above-mentioned direction, and therefore maintenance and inspection can be easily performed.

(Example) Hereinafter, the present invention will be described with reference to examples.

FIG. 1 is a partial perspective view of a general-purpose internal combustion engine equipped with an air cleaner according to the present invention and a side view including a notch, and FIG. 2 is a partial perspective view and a partial view of a general-purpose internal combustion engine equipped with an air cleaner according to the present invention. FIG. 3 is a plan view including a notch portion, and FIG. 3 is a plan sectional view of the air cleaner according to the present invention (a sectional view taken along the line AA of FIG. 1).

As shown in FIG. 1, the cylinder 2 is viewed from the side.
Are arranged in an inclined manner, and a crank chamber (not shown because it is located behind the recoil starter 4) is located at the lower right of the base end portion of the cylinder 2, and the recoil starter is located on the front side thereof. 4 are arranged. Further, as shown in FIG. 2, the carburetor 3 has the above-mentioned cylinder 2
On the other hand, in plan view, the air cleaner side is separated from the fan housing side, that is, the fan housing 5
Is inclined and arranged so that the connecting portion to the cylinder 2 side is located on the upper side as much as possible. A fuel tank 1 is arranged from above the cylinder to above the crank chamber so as to cover them.

Further, as shown in FIG. 2, the recoil starter 4 projects laterally (downward in FIG. 2) from the cylinder 2 in a direction in which it becomes wider in a plan view.
Then, as shown in FIG. 2 or FIG. 1, a corner portion of the cylinder upper portion of the internal combustion engine on the recoil starter 4 side,
An air cleaner 16 is arranged so as to be accommodated in a space formed on the cylinder 2 side of a virtual plane extending from the surface of the recoil starter 4 (referred to as a cylinder side of a space partitioned by the virtual plane). As shown in FIG. 3, the air cleaner 16 has an air cleaner body 7, a cover (cover of the air cleaner) 8, and elements 9 and 10 contained therein. The cover surface 8a of the cover 8 is parallel to the recoil starter mounting surface 4a, and the cover surface 8a, the cover side surfaces 8b, 8c,
Carburetor mounting surface 3a and air cleaner body side surface 7
The a and 7b form a trapezoid whose plane cross section is substantially sloping. Further, in FIG. 3, 9 is a primary element made of urethane, 10 is a secondary element of filter paper, and these two elements are installed at positions where the angle formed by the carburetor mounting surface 3a and the cover surface 8a is approximately divided. Has been done. Also, the third
As shown in the drawing, the mating surface 13 between the air cleaner body 7 and the cover is configured to be substantially parallel to the elements 9 and 10.

11 is an air inlet, 12 is an air outlet to the carburetor side, 1
Reference numerals 4 and 15 are air passage portions having a substantially triangular cross section.

Since the air cleaner according to the present invention has a compact structure, as shown in FIG.
The starting grip 6 can be operated in the direction of arrow B without being disturbed by the air cleaner 16.

The cover 8 can be attached and detached in the direction of arrow E in FIG. In this case, although there is a portion that slightly interferes with the starting grip 6, since the starting grip has a structure in which a stretchable string-like member is attached to a plastic grip portion, the starting grip 6 covers the cover 8. It is not difficult at all so as not to interfere with the attachment and detachment of the vehicle, and it does not substantially interfere with the starting grip 6.

The air flow of the air cleaner according to the present invention constructed as above will be described. The air is taken in from the lowermost part of the air cleaner 16 as shown by the arrow D in FIG. 1, the relatively coarse dust is removed by the primary element 9 through the air passage portion 14 in FIG. 3, and then the secondary element is removed. At 10, fine dust is removed. And the air passage part 15
And then flows into the carburetor 3.

(Effect of the Invention) As described in detail above, the air cleaner according to the present invention is
It has a compact structure and excellent operability and maintainability, and is extremely useful in practice as an air cleaner for a general-purpose internal combustion engine.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a general-purpose internal combustion engine equipped with an air cleaner according to the present invention and a side view including a notch, and FIG. 2 is a partial perspective view and a partial view of a general-purpose internal combustion engine equipped with an air cleaner according to the present invention. A plan view including a notch portion, FIG. 3 is a sectional view taken along the line AA of FIG. 1, and FIGS. 4 and 5 are plan sectional views when a conventional air cleaner is attached to a carburetor, respectively.
FIG. 6 is a longitudinal sectional view of a conventional air cleaner, FIG. 7 is a perspective view of a conventional engine generator having a frame, and FIG. 8 is a side view of a conventional general-purpose internal combustion engine. 1 ... Fuel tank, 2 ... Cylinder, 3 ... Carburetor, 3a
... Carburetor mounting surface, 4 ... Recoil starter, 4a ... Recoil starter mounting surface, 7 ... Air cleaner body, 8 ... Cover, 8a ... Cover surface, 9 ... Primary element, 10 ... Secondary element, 13 ... Mating surface, 16 ... Air cleaner

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder is disposed so as to be inclined in a side view, and a carburetor is disposed so as to be separated from a fan housing side on an air cleaner side in a cylinder in a plan view, and is provided on a side of a crank chamber. In a general-purpose internal combustion engine in which the recoil starter projects in a direction in which the recoil starter becomes wider in a plan view than the cylinder portion, and a fuel tank is arranged from above the cylinder to above the crank chamber, the air cleaner is The corner of the upper part of the cylinder on the recoil starter side should fit in the space formed on the cylinder side of the virtual plane that extends the surface of the recoil starter, and the cover surface of the air cleaner should be parallel to the recoil starter mounting surface. The flat cross-section is a trapezoid with a substantially unilateral slope, and When viewed, the elements are arranged at an angle that makes the angle between the carburetor mounting surface of the air cleaner body and the surface of the cover approximately equal, and the mating surface of the air cleaner body and the cover of the air cleaner is provided substantially parallel to the element. An air cleaner characterized by that.