JPH08319812A - Soundproof engine - Google Patents

Abstract

PURPOSE: To suppress icing on a tube leading-out part at a cold district by erecting a cylindrical body whose bottom end opening part is faced to an underfloor space from a floor plate in a soundproof case, housing the tube leading-out end part of a blazer tube in the cylindrical body, and facing the leading-out end part to the lower end opening part of the cylindrical body. CONSTITUTION: In a soundproof case l, a cylindrical body 7 is erected from a bottom plate 6 of the soundproof case 1, and the lower end opening part 8 of the cylindrical part 7 is faced to the underfloor space 5 out of the soundproof case 1. The tue leading-out part 9 of a blazer tube 4 is housed in the cylindrical body 7 in a condition in which it is not brought in contact with the cylindrical body 7, the leading-out end opening part 10 of the blazer tube 4 is faced to the lower end opening part 8 of the cylindrical body 7. Since wind 13 venting out the underfloor space 5 not attack with the tube leading-out end part 9 and cooling operation is not carried out, icing in the tube leading-out end part 9 at a cold district is suppressed, and it is suppressed that lubricating oil is leaked from an oil seal and the like.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a soundproof engine. In the present invention, the soundproof type engine refers to one in which the engine is housed in a soundproof case, and includes both one housing only the engine and one housing the working machine such as the engine and the generator.

[0002]

2. Description of the Related Art As a conventional technology of a soundproof engine, there is one having the following basic structure as in the present invention. That is, there is a structure in which an engine is housed in a soundproof case, a blazer tube is led out from a breather chamber of the engine, and blow-by gas is led out from the blazer chamber to the underfloor space outside the soundproof case via the blazer tube. .

In the soundproof type engine of this type, the fifth type is conventionally used.
As shown in the figure, a tube insertion hole 112 is opened in the floor plate 106 of the soundproof case, and the tube lead-out end portion 109 is inserted into the tube insertion hole 112.
09 is exposed to the underfloor space 105 outside the soundproof case in an exposed state.

[0004]

In the above-mentioned prior art, the wind 113 blown through the underfloor space 105 hits the exposed tube lead-out end portion 109, and the tube lead-out end portion 109.
Is cooled strongly. Therefore, in cold regions, water contained in the blow-by gas passing through the breather tube 104 may freeze in the tube lead-out end portion 109 and clog the breather tube 104. In this case, the lubricating oil may leak from the oil seal or the like due to an abnormal increase in the internal pressure of the crankcase.

An object of the present invention is to provide a soundproof engine capable of suppressing freezing in the tube outlet end.

[0006]

[Means for Solving the Problems]

(First Invention) As shown in FIG. 1 (A), the first invention accommodates an engine 2 in a soundproof case 1, guides a breather tube 4 from a breather chamber 3 of the engine 2 and
In the soundproof engine configured so that the blow-by gas is led out to the underfloor space 5 outside the soundproof case 1 via the breather tube 4, it is characterized as follows.

That is, as shown in FIGS. 1B to 4, a cylindrical body 7 is raised from the bottom plate 6 in the soundproof case 1, and a lower end opening 8 of the cylindrical body 7 is placed under the floor outside the soundproof case 1. The tube lead-out end portion 9 of the blazer tube 4 is housed inside the tube body 7 in a state where it faces the space 5 and does not come into contact with the tube body 7, and the lead-out end opening 10 of the breather tube 4 is placed at the lower end of the tube body 7. It is characterized in that it faces the opening 8.

(Second Invention) A second invention is characterized in that, in the soundproof engine of the first invention, as shown in FIG. 4, a heating element 11 is attached to the cylindrical body 7.

[0009]

Actions and effects of the present invention

(First Invention) In the first invention, as shown in FIGS.
Since the wind 13 blowing through the underfloor space 5 does not hit the tube lead-out end 9, cooling of the tube lead-out end 9 by the wind 13 does not occur. Therefore, freezing in the tube lead-out end portion 9 in the cold district is suppressed, abnormal increase in the internal pressure of the crankcase due to clogging of the breather tube 4 is suppressed, and leakage of lubricating oil from the oil seal or the like can be suppressed.

(Second Invention) In the second invention, as shown in FIG. 4, the wind 13 blown through the underfloor space 5 does not hit the tube lead-out end 9, so that the wind 13 blows away the tube lead-out end 9. In addition to no cooling, the heat generated by the heating element 11 warms the tube lead-out end 9. Therefore, freezing in the tube lead-out end portion 9 in a cold region is prevented, an abnormal increase in the internal pressure of the crankcase due to clogging of the breather tube 4 is suppressed, and leakage of lubricating oil from an oil seal or the like can be suppressed.

[0011]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a first embodiment of the present invention. In this first embodiment, a soundproof engine generator, which is a kind of soundproof engine, is used, and its basic structure is as follows. That is, as shown in FIG.
The engine 2 is housed in the engine, and the engine 2 has a breather chamber 3
And the blow-by gas is led out from the breather chamber 3 to the underfloor space 5 outside the soundproof case 1 through the breather tube 4.

The engine 2 is a horizontal engine, and the cylinder head is provided at the lateral end of a cylinder block 16 in which a crankcase and a cylinder are integrally formed with the cylinder axis 14 as the lateral direction and the crankshaft axis 15 as the front-rear direction. 17
The timing transmission case 18 is mounted on the front side of the cylinder block 16, and the output wheel 19 is arranged on the rear side of the cylinder block 16. The breather chamber 3 is arranged on the upper lateral side of the timing transmission case 18. The breather tube 4 is made of rubber. The breather tube 4 is led out directly below the breather chamber 3 so that the lubricating oil and the water condensed in the breather tube 4 flow out naturally. Floor board 6 of soundproof case 1
Legs 20 are attached to the lower surface of the floor, and the underfloor space 5 is provided below the floor plate 6.
Has been formed.

A generator 21 is provided on the lateral side of the engine 2.
Is arranged, and the power transmission belt 23 is wound around the output wheel 19 of the engine 2 and the input wheel 22 of the generator 21. The engine 2 and the generator 21 are mounted on a mounting plate 24, and are vibration-proof supported by a vibration-proof rubber 25 on the floor plate 6 of the soundproof case 1. The blazer tube 4 penetrates the mounting plate 24 and is led out to the vicinity of the floor plate 6. In FIG. 1A, reference numeral 26 is a radiator, 27 is a cooling fan, 28 is a fan motor, and 29 is a fuel tank.

In this embodiment, in order to suppress freezing in the tube lead-out end portion 9, the following constitution is adopted. That is, as shown in FIG. 1B, a cylinder 7 is raised from the bottom plate 6 in the soundproof case 1, and a lower end opening 8 of the cylinder 7 is opened.
Is exposed to the underfloor space 5 outside the soundproof case 1, and the tube lead-out end portion 9 of the blazer tube 4 is accommodated inside the tube body 7 in a state where the tube body 7 is not in contact with the lead-out end opening portion of the blazer tube 4. 10 is made to face the lower end opening 8 of the cylindrical body 7.

According to such a configuration, the wind 13 blowing through the underfloor space 5 does not hit the tube lead-out end 9, so that the tube 13 is not cooled by the wind 13. Therefore, freezing in the tube lead-out end portion 9 in the cold district is suppressed, abnormal increase in the internal pressure of the crankcase due to clogging of the breather tube 4 is suppressed, and leakage of lubricating oil from the oil seal or the like can be suppressed.

The tubular body 7 is composed of a metal tube 30 and a heat insulating tube 31, the lower end of the metal tube 30 is penetrated into a tube insertion hole 32 of the floor plate 6 and fixed by welding, and the lower part of the heat insulating tube 31 is made of metal. Tube 3
The tube lead-out end portion 9 is housed inside the non-outer fitting portion 33 of the heat insulating cylinder 31. Therefore, heat dissipation from the tube lead-out end 9 to the surroundings is suppressed by the heat retaining cylinder 31, and even if the tube lead-out end 9 comes into contact with the heat retaining wall 31 due to vibration or the like, the heat is not transferred from the tube lead-out end 9 to the heat retaining wall 31.
Since the heat conduction to the tube is low, the cooling of the tube lead-out end portion 9 is suppressed more reliably. The metal tube 30 is made of iron, and the heat insulation tube 31 is made of rubber. The heat retaining cylinder 31 may be made of a material having a lower thermal conductivity than metal, and may be made of resin or other material.

The second embodiment shown in FIG. 2 is a modification of the first embodiment, in which the tubular body 7 is composed of only the heat retaining cylinder 31, and the lower end portion of the heat retaining cylinder 31 is inserted into the cylinder insertion hole 32 of the floor plate 6. It has the same structure as that of the first embodiment except that it is penetrated and fixed internally. In FIG. 2, the same elements as those in the first embodiment are designated by the same reference numerals.

The third embodiment shown in FIG. 3 is also a modification of the first embodiment and has the same construction as that of the first embodiment except that the cylindrical body 7 is composed of only the metal cylinder 30. First in FIG.
The same elements as those in the embodiment are designated by the same reference numerals.

The fourth embodiment shown in FIG. 4 is also a modification of the first embodiment, and the first embodiment is different from the first embodiment except that the tubular body 7 is composed of only the metal tube 30 and the heating element 11 is attached to the tubular body 7. It has the same configuration as that of the embodiment. In FIG. 4, the same elements as those of the first embodiment are designated by the same reference numerals.

According to such a configuration, the wind 13 blowing through the underfloor space 5 does not hit the tube lead-out end 9, so that the tube 13 is not cooled by the wind 13 and the heating element 11 is not generated. The tube lead-out end portion 9 is warmed by the heat generated by. Therefore, freezing in the tube lead-out end portion 9 in a cold region is prevented, an abnormal increase in the internal pressure of the crankcase due to clogging of the breather tube 4 is suppressed, and leakage of lubricating oil from an oil seal or the like can be suppressed.

A heating wire 34 is used as the heating element 11 and is wound around the outer circumference of the cylindrical body 7. The heating wire 34 is the generator 2
1, so that the heating wire 34 is energized from the generator 21 during the operation of the engine generator, so that the battery does not run down.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a soundproof engine generator according to a first embodiment, FIG. 1 (A) is a vertical sectional view, and FIG. 1 (B) is a longitudinal sectional view of a main part.

FIG. 2 is a view corresponding to FIG. 1B of the second embodiment.

FIG. 3 is a view corresponding to FIG. 1B of the third embodiment.

FIG. 4 is a view corresponding to FIG. 1B of the fourth embodiment.

FIG. 5 is a view corresponding to FIG. 1B of the conventional technique.

[Explanation of symbols]

1 ... Soundproof case, 2 ... Engine, 3 ... Blaze room, 4 ... Breather tube, 5 ... Underfloor space, 6 ... Floor plate, 7 ... Cylindrical body, 8
... lower end opening, 9 ... tube lead-out end, 10 ... lead-out end opening, 11 ... heating element.

Claims (2)

[Claims] 1. An engine (2) is housed in a soundproof case (1), a breather tube (4) is led out from a breather chamber (3) of the engine (2), and a breather tube (3) is pulled out from the breather chamber (3). 4)
In the soundproof type engine configured so that blow-by gas is led to the underfloor space (5) outside the soundproof case (1), the cylindrical body (7) is inserted from the bottom plate (6) into the soundproof case (1). Standing up, the lower end opening (8) of the tubular body (7) is exposed to the underfloor space (5) outside the soundproof case (1), and the tubular body (7) is kept in contact with the tubular body (7). The tube lead-out end portion (9) of the breather tube (4) was housed inside, and the lead-out end opening portion (10) of the breather tube (4) was exposed to the lower end opening portion (8) of the tubular body (7). A soundproof engine characterized by the following. 2. The soundproof engine according to claim 1, wherein a heating element (11) is attached to the cylindrical body (7).