JPH0540278Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention consists of a case in which an engine and a working machine driven by the engine are housed in a case, and the case is equipped with a portable handle. This invention relates to engine working equipment.

(2) Prior Art The above-mentioned engine working device includes, for example, a portable handle that includes a grip portion that extends approximately horizontally, and that is integrally connected to one end of the grip portion via a bent portion and attached to the outer surface of the case. There are conventionally known devices equipped with a mounting portion.

(3) Problems to be solved by the invention In the conventionally known devices mentioned above, in order to suppress the intake noise to the air cleaner, it is necessary to make the intake passage from the intake port to the air cleaner element as long as possible. If the air cleaner element inside the case and the intake port on the outside of the case are connected by a long intake pipe inside the case, there is a problem that the piping structure inside the case becomes complicated and the case becomes larger.

The present invention has been developed in view of the above circumstances, and aims to provide a portable engine working device that can contribute to reducing intake noise to the air cleaner while reducing the size and simplifying the structure of the case. purpose.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, the present invention has an engine and a working machine driven by the engine housed in a case, and the case has a portable handle. is attached to the mobile phone handle, and the mobile handle has a grip portion that extends substantially horizontally, and a mounting portion that is integrally connected to one end of the grip portion via a bent portion and is attached to the outer surface of the case. In the engine working device, at least the gripping portion and the bending portion are formed hollow, and the hollow portions are directly communicated with each other to form an intake passage in the portable handle that connects to the engine on the downstream side. , an intake port of the intake passage is opened at the other end of the gripping portion, and an enlarged passage portion is formed in the intake passage within the bent portion to serve as a resonance chamber that cooperates with the intake passage within the gripping portion. The present invention is characterized in that an air cleaner element for cleaning intake air flowing through the intake passage is disposed at the outlet of the enlarged passage.

(2) Effect According to the above configuration, by utilizing the unique form of the mobile handle that has a grip portion that extends approximately horizontally and a bending portion connected to the grip portion, the grip portion and the bending portion are extended. It is possible to easily configure an intake passage with a resonance chamber that has a large effect of reducing intake noise. Moreover, since the mobile handle itself functions as an independent air cleaner unit with a long air intake path upstream of the air cleaner element, there is no need to make the case particularly large or complicated to install the air cleaner, and the mobile handle and air cleaner can be connected easily. Since they can be handled as one small assembly, the air cleaner can be assembled at the same time as the portable handle is assembled to the case, and the assembly work efficiency is extremely high.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. 1, this engine working device is an engine generator, and an engine E is installed in a case 1 constituting a soundproof case. A generator G as a working machine driven by the engine E is housed therein.

The engine body 2 of the engine E is fixedly arranged within the case 1 with its crankshaft 3 extending substantially vertically downward. The intake port of this engine body 2 is arranged on one side of the crankshaft 3,
A carburetor 4 is connected to the intake port. Further, an exhaust port of the engine body 2 is arranged on the other side of the crankshaft 3, and an exhaust muffler 5 is connected to the exhaust port on the side opposite to the carburetor 4. Further, a tail pipe 6 connected to the exhaust muffler 5 is opened to the outside at a lower side surface of the case 1.

The generator G is arranged below the engine E, and has a bowl-shaped rotor 7 fixed to the crankshaft 3.
, a magnetic pole 8 made of a permanent magnet fixed to the inner surface of the rotor 7, a cooling fan 9 fixed to the opening edge of the rotor 7, and a stator winding 10 facing the magnetic pole 8. The stator 11 is fixedly arranged within the rotor 7.

The recoil starter 1 is located on the top of the engine body 2.
2 is arranged, and this recoil starter 12
A rope 13 extending from the case 1 is pulled out from the case 1, and a knob 14 is provided at the protruding end of the rope 13.

Referring also to Fig. 2, the recoil starter 1
A synthetic resin fuel tank 15 is disposed in the upper part of the case 1 so as to partially cover the portion of the fuel tank 2 near the carburetor 4 and the carburetor 4. This fuel tank 1
5 is integrally provided with an injection cylinder 16 that projects upward from the upper part of the case 1.
The outer end of the cap is closed with a removable cap 17.

A mobile handle 18 made of synthetic resin is fixed to the top of the case 1.
An intake passage 19 is formed from the fuel tank 8 to the carburetor 4 via the fuel tank 15, and air purified by an air cleaner element 20 provided in the middle of the intake passage 19 is supplied to the carburetor 4.

The intake passage 19 consists of a first intake passage 21 formed in the portable handle 18 and a second intake passage 22 formed in the fuel tank 15 and communicating with the first intake passage 21. 22 is communicated with the carburetor 4 via a connecting member 23.

In FIGS. 1 and 3, the mobile handle 18 includes a hollow gripping portion 26 extending in a substantially horizontal direction, and a gripping portion 26 extending substantially horizontally.
6, a hollow flat attachment part 27 extending along the grip part 26 below the grip part 26; and a hollow bent part bent downward from one end of the grip part 26 and extending toward one end of the attachment part 27. 25, a grip part 26, and a mounting part 27
It is composed of a solid connecting part 28 that connects the other ends to each other, and an enlarged part 29 is integrally formed at the lower part of one end side of the mounting part 27, which opens outward on the one end side and bulges downward. will be installed consecutively. Furthermore, the enlarged portion 29 is formed in a substantially U-shape with a downwardly opened cross section so as to straddle the knob 14 of the recoil starter 12.

A connecting pipe 40 is integrally protruded from the lower part of the other end of the mounting portion 27 . Further, one end of the grip portion 26 is closed by an end plate 31, and a half-moon-shaped intake port 32 communicating with the inside of the grip portion 26 is bored in the end plate 31.

The bent portion 25 includes a grip portion 26 and a mounting portion 27.
a base 25 that extends integrally across one end of the other;
b, and a cover 25a that is removably fitted into the opening of the base 25b. The base 25a of the bent portion 25 and the gripping portion 2
6, the mounting portion 27 including the enlarged portion 29, and the connecting portion 2
8 are formed integrally with each other and the handle body 2
4. Further, the base 25 of the bent portion 25
A protrusion 33 that protrudes outward is integrally provided approximately at the center of the inner surface of b, and a locking hole 34 is provided in this protrusion 33 .

By fitting the cover 25a with the handle main body 24 (the base 25b of the bent portion 25), it extends over the entire length of the grip portion 26 and is reversed 180 degrees at one end so that the handle body 24 (the base portion 25b of the bent portion 25) extends from the bent portion 25 to the mounting portion. 27
A first intake passage 21 is formed leading to the other end,
The cover 25a is formed to bulge outward to form an enlarged passage portion 35 that becomes a resonance chamber within the bent portion 25 in the middle of the first intake passage 21.
Moreover, the cover 25a is provided with a protrusion 36 that abuts the protrusion 33, and a fastening member 37 that can penetrate the protrusion 36 from the outside of the cover 25a and engage with the locking hole 34 is attached to the handle body. A cover 25a is detachably connected to 24.

The bent portion 25 is provided with a fitting receiving portion 39 into which the air cleaner element 20 that partitions the first intake passage 21 into an upstream portion and a downstream portion thereof can be fitted, and when the cover 25a is removed. By pressing the air cleaner element 20 against the fitting receiving portion 39 and fitting it, the air cleaner element 20 is inserted in the middle of the first intake passage 21 (particularly at the outlet of the enlarged passage portion 35). As a result, an air cleaner AC is configured within the portable handle 18.

Thus, a large passage chamber 3 is provided in the middle of the first intake passage 21.
5, between the intake port 32 and the air cleaner element 20, there is a so-called chamber (corresponding to the enlarged passage part 35) connected to the nose (corresponding to the intake passage 21 in the grip part 26). A resonant chamber type silencing structure is constructed. In such a silencing structure, when the length and cross-sectional area of the nose are L and S, the capacitance of the chamber is V, and the speed of sound is C, the resonant frequency is obtained by the following Helmholtz equation.

=(C/2π)×√(×) The human ear is generally insensitive to sounds with frequencies below 100Hz, and if quietness is desired, it is necessary to suppress the resonance frequency to below 100Hz. In other words, based on the above formula, it is necessary to choose between reducing the cross-sectional area S, increasing the capacity V, or increasing the length L, but S and V are approximately equal to the output of the engine E. Therefore, it is necessary to increase L.

From this point of view, the grip portion 26 of the first intake passage 21
The length and cross-sectional area within the handle are determined, and in order to make the cross-sectional area appropriate, the grip portion 26 is integrally provided with a semicircular partition plate 38 that forms a flow path with an appropriate cross-sectional area.

In FIG. 4, the connecting tube 4 of the mobile handle 18 is
A communication pipe 41 into which the fuel tank 10 is fitted at the upper end is provided to pass through the fuel tank 15 above and below, and a second intake passage 22 is formed within this communication pipe 41.
Further, below the fuel tank 15, there is a bowl-shaped half body 23a connected to the carburetor 4, and a half body 2 that is removably connected to the half body 23a and defines a second bulk chamber 43.
3b is disposed, and a cone tube 45 connected to the lower end of the communication pipe 41 is fitted into a connection hole 44 formed in one half 23a. In this way, the first intake passage 21 is connected to the carburetor 4 via the second intake passage 22, the cone tube 45, and the second enlarged chamber 43. Moreover, by providing the second enlarged chamber 43 midway, it is possible to obtain the sound damping effect of the above-mentioned resonance chamber type sound damping structure.

Next, to explain the operation of this embodiment, when the generator G is driven by the operation of the engine E,
The engine E has a first intake passage 2 from the intake port 32.
1. An air-fuel mixture in which fuel atomized in the carburetor 4 is mixed into the air that has flowed into the carburetor 4 through the second intake passage 22 and the second expansion chamber 43 is supplied.
At this time, since the suction port 32 is provided at the top, it is possible to prevent dust from being sucked into the suction port 32 as much as possible, and since the air is taken in from the outside of the case 1, the temperature of the intake air is kept relatively low. Thus, the output of the engine E can be improved.

In addition, the air cleaner AC is provided in the middle of the first intake passage 21 provided inside the portable handle 18 outside the case 1, and the length from the intake port 32 to the air cleaner element 20 is made relatively long outside the case 1. Since this is possible, the case 1 can be made more compact while reducing intake noise.

Moreover, the mobile handle 18 includes a handle body 24 attached to the case 1, and a handle body 24 attached to the case 1.
Since the air cleaner element 20 can be attached and detached with the cover 25 removed, maintenance of the air cleaner AC can be performed outside the case 1 without having to open or close the case 1. Work can be done easily.

Also, a second intake passage 2 connected to the first intake passage 21
2, and a communication pipe 4 that vertically penetrates the fuel tank 15.
1, the intake passage within the case 1 can be made shorter and the first intake passage 21 can be communicated with the carburetor 4, which contributes to making the case 1 more compact.

C. Effects of the invention As described above, according to the invention, by utilizing the unique shape of the mobile handle that has a gripping part that extends approximately horizontally and a bending part connected to the gripping part, the gripping part and the bending part are In addition, since it is possible to configure an intake passage with a resonance chamber that is highly effective in reducing intake noise, intake noise to the air cleaner can be effectively reduced. Moreover, the mobile handle itself
Since the air cleaner element functions as an independent air cleaner unit having a long intake passage on the upstream side, the structure of the case can be made smaller and simpler, and the workability of assembling the air cleaner can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall longitudinal sectional side view, Fig. 2 is a cross-sectional view taken along the line -- in Fig. 1, and Fig. 3 is an enlarged exploded perspective view of a mobile handle.
FIG. 4 is a sectional view taken along the line -- in FIG. 2. 1...Case, 18...Mobile handle, 20...
...Air cleaner element, 21...First intake passage as an intake passage, 25...Bend portion, 26...
Gripping part, 27...Mounting part, E...Engine, G...
...A generator as a working machine.

Claims (1)

[Scope of utility model registration request] An engine E and a work machine G driven by the engine E are housed in a case 1.
A mobile handle 18 is attached to the case 1 , and the mobile handle 18 includes a grip portion 26 that extends approximately horizontally, and is integrally connected to one end of the grip portion 26 via a bent portion 25 . In an engine working device having a mounting portion 27 attached to the outer surface, at least the gripping portion 26 and the bending portion 25 are formed hollow, and the hollow portions are directly communicated with each other, so that the downstream side is An intake passage 21 connected to the engine E is formed in the portable handle 18, and an intake port 32 of the intake passage 21 is opened at the other end of the grip part 26, and is connected to the intake passage 21 in the bent part 25. , an air cleaner element forming an enlarged passage section 35 that serves as a resonance chamber in cooperation with the intake passage 21 in the gripping part 26, and at an outlet of the enlarged passage section 35, cleaning the intake air flowing through the intake passage 21; 1. A portable engine working device, characterized in that: 20 is disposed therein.