JP2563938Y2 - Engine for work machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine for a working machine such as a hydraulic shovel, and more particularly to an engine for a working machine having an exhaust pipe or the like provided with a safety cover for preventing fire and burns.

[0002]

2. Description of the Related Art A hydraulic excavator will be described as an example of a conventional working machine with reference to FIGS. 8 and 9. FIG.

In the drawings, reference numeral 1 denotes a hydraulic shovel as a working machine. The hydraulic shovel 1 includes a lower traveling body 2, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a working device to be described later. 8 and is roughly constituted. The lower traveling unit 2 and the upper revolving unit 3 are provided with traveling and turning hydraulic motors (both not shown), and these hydraulic motors are driven by a working machine engine 7 described later. By supplying pressure oil from a hydraulic pump,
Running and turning operations are performed.

[0004] On the other hand, the upper revolving superstructure 3 includes a cab 4 and a machine room 5.
And a counterweight 6, etc., in which a working machine engine 7 and a working machine engine 7
A hydraulic pump (not shown) driven by the motor is provided.

[0005] Reference numeral 8 denotes a working device provided in front of the upper revolving unit 3, and the working device 8 includes hydraulic cylinders 8A, 8A.
B, 8C, etc. are provided, and the hydraulic cylinders 8A, 8B,
The working device 8 is driven by supplying and discharging pressure oil from the hydraulic pump to 8C and the like, and extending and contracting the rod of each hydraulic cylinder.

[0006] The hydraulic excavator 1 configured as described above includes:
Hydraulic pumps, which are driven by the working machine engine 7, supply hydraulic oil to the hydraulic cylinders 8A, 8B, 8C and hydraulic motors, drive the working device 8 to perform excavation work, and drive the swing motor and the traveling motor. To transport and run earth and sand.

Here, the working machine engine 7 will be described.

In the drawing, reference numeral 9 denotes an engine main body constituting the working machine engine 7. The engine main body 9 has a cylinder block 10 having, for example, six cylinders (not shown).
A cylinder head 11 is disposed above, and in each cylinder of the cylinder block 10, fuel is exploded in a predetermined order, thereby depressing a piston to take out a rotational output from a crankshaft (both not shown). I have.

Reference numeral 12 denotes an intake pipe attached to the cylinder head 11 of the engine body 9. The intake pipe 12 is provided with a supercharger 13 fixed to the cylinder head 11 of the engine body 9 at an intermediate portion thereof. The supercharger 13 is the intake pipe 1
The air guided from the front end of the cylinder block 2 is compressed and sent to each cylinder of the cylinder block 10 under pressure.

Reference numeral 14 denotes an exhaust pipe mounted on the front side of the cylinder head 11. The exhaust pipe 14 includes an exhaust manifold 15 and an outlet pipe 16, and is provided between the exhaust manifold 15 and the outlet pipe 16. Is provided with an exhaust turbine 17 described later. here,
The exhaust manifold 15 includes a plurality of brackets 15A, 15A,... And bolts 15B, 15B,
The exhaust gas discharged from the exhaust port of the cylinder head 11 is collected at the junction 15C and guided to the exhaust turbine 17.

Reference numeral 17 denotes a cylinder head 1 of the engine body 9.
1 shows an exhaust turbine provided in the exhaust turbine 1
Numeral 7 has a spiral casing 17A whose radius gradually increases from the center, and an impeller (not shown) rotated by exhaust gas inside the casing 17A. The supercharger 13 is driven by being rotationally driven by the exhaust gas. Also,
The exhaust gas obtained by rotating the impeller of the exhaust turbine 17 is provided at an upper portion of the machine room 5 through a large-diameter outlet pipe 16 connected to a radially central portion of a casing 17A of the exhaust turbine 17 as shown in FIG. Guided to silencer 18,
Released into the atmosphere.

Reference numeral 19 denotes a cooling water inlet for cooling the cylinder block 10 and the like of the engine body 9, and the cooling water inlet 19 is provided on a right side of the working machine engine 7 in FIG. (See FIG. 8), and the cooling water supplied from the radiator 20 is supplied to a water pump 21.
The water manifold 2 at the top of the engine body 9
Pump to 2. The cylinder block 10 and the like are water-cooled by the cooling water supplied from the water manifold 22 to prevent seizure of the piston and the like. Here, the radiator 20 and the working machine engine 7
A cooling fan (not shown) rotatably driven by the working machine engine 7 is provided between
By flowing outside air introduced from outside the machine room 5 through the radiator 20 as cooling air in the direction of arrow A,
The working machine engine 7 is air-cooled.

The working machine engine 7 according to the prior art is configured as described above. The working machine engine 7 explodes fuel in each cylinder of the cylinder block 10 to obtain rotational output from the crankshaft, and at this time, The impeller in the exhaust turbine 17 is rotated by using the generated exhaust gas,
The supercharger 13 is driven by the exhaust turbine 17 to improve the intake efficiency. The cylinder block 10 and the like are cooled by cooling water circulating between the radiator 20 and the working machine engine 7, and the exhaust pipe 14 and the like pass through the radiator 20 and are guided from the cooling fan in the direction of arrow A. The air is cooled by the cooling air to prevent the working machine engine 7 from overheating.

[0014]

In the above-described hydraulic shovel according to the prior art, an operator needs to enter the machine room 5 when checking the oil level of engine oil or checking the engine body 9 and the like. There is.

Here, the working machine engine 7 is provided with an exhaust pipe 1.
4 is exposed outside the engine body 9 and the exhaust pipe 1
No. 4 is extremely dangerous because the exhaust manifold 15 and the exhaust turbine 17 become extremely hot due to the high heat from the exhaust gas, and it is dangerous to touch the worker's body. There is a problem that there is a risk of occurring.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can eliminate the danger of burns of workers by using cooling air from a cooling fan, and can prevent oil and the like from adhering. It is an object of the present invention to provide a working machine engine capable of preventing occurrence of a fire.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an engine body provided in a machine room of a working machine and having a plurality of cylinders, and intake air into each cylinder of the engine body. In order to supply, an intake pipe provided with a supercharger at an intermediate position, an exhaust pipe having an exhaust manifold for guiding exhaust gas discharged from each cylinder of the engine body to the outside, and an upper part of the exhaust manifold. position
And an exhaust turbine provided in the exhaust pipe to drive the supercharger using the flow of exhaust gas, and a cooling fan attached to the engine body and cooling the engine body together with a radiator. Applied to work machine engines. A feature of the configuration adopted by the invention of claim 1 is that a metal plate is bent into a U-shaped cross section on the engine body.
Is formed by a gel, by covering the exhaust manifold of the exhaust pipe partially an exhaust manifold cover forming a first cooling air passage between the exhaust manifold, the in the upper exhaust manifold cover A turbine cover formed to be curved to partially cover the exhaust turbine and forming a second cooling air passage between the turbine cover and the exhaust turbine;
Above the engine body.
A bin cover bracket and the exhaust manifold
The cover has the first cooling air passage in its upper part.
A notch for communicating with the second cooling air passage is provided,
The cooling air from the cooling fan is separated from the first cooling air passage.
The configuration is such that the cooling air flows through the second cooling air passage through the cutout .

[0018]

[Action] With the above structure, part of the exhaust manifold in the exhaust manifold cover forming a U-shaped section for example from the front side
Min to cover, to form a first cooling air passage with a certain gap between the exhaust manifold cover and the exhaust manifold. Also, on the upper side of the exhaust manifold cover
For example, to partially cover the exhaust turbine from the front side
By providing a curved turbine cover
Ri, the second cooling air passage can be formed with a certain clearance between the turbine cover and the exhaust turbine, exhaust Maniho
Notch in the upper part of the cover
The airflow passage communicates with the upper second cooling air passage.
it can. Its to, generated from the cooling fan of the engine body
The cooling air flows through the first cooling air passage to cool the exhaust manifold and the exhaust manifold cover ,
And flows into the second cooling air passage.
Cooling air from the cooling fan is exhaust turbine and turbine cover
Flows into the second cooling air passage through the gap
In by both of the cooling air can securely cool the exhaust turbine and the turbine cover, it is possible to suppress the temperature rise of the exhaust manifold cover and the turbine cover. Also,
With the safety cover including the exhaust manifold cover and the turbine cover, it is possible to prevent the worker's body from directly contacting the exhaust pipe and the exhaust turbine, and preventing oil from adhering.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. The same reference numerals are given to the same components as those in the above-described conventional technology, and the description thereof will be omitted.

In the drawing, reference numeral 31 denotes a working machine engine according to the present embodiment. The working machine engine 31 is substantially the same as the conventional working machine engine 7, and has an engine body 9, an intake pipe 12, and an exhaust pipe. The work machine engine 31 is provided with a safety cover 32 that covers the exhaust manifold 15 and the exhaust turbine 17 that constitute the exhaust pipe 14 from the outside.

Here, the safety cover 32 is, as described later,
An exhaust manifold cover 33 that partially covers the exhaust manifold 15 from the front side;
A turbine cover 34 that covers the turbine cover 3;
And a turbine cover bracket 35 for attaching the engine 4 to the engine body 9.

Reference numeral 33 denotes an exhaust manifold cover. As shown in FIG. 4, the exhaust manifold cover 33 is formed in a rain gutter shape by bending a long thin metal plate into a substantially U-shaped cross section. And upper and lower bent portions 33B, 3
3C. Here, the exhaust manifold cover 33 is provided with cutouts 33D, 33D located on the bent portion 33B side and at the middle portion in the longitudinal direction, and between the cutouts 33D, as shown in FIG. A mounting portion 33F is formed which protrudes and has three mounting holes 33E, 33E,... Provided at predetermined intervals in the longitudinal direction. The exhaust manifold cover 33 has three mounting bolts 15B among the mounting bolts 15B, 15B,... For mounting the exhaust manifold 15 to the cylinder head 11 via the brackets 15A. By being inserted into 33E, it is fastened and fixed to the cylinder head 11 together with each bracket 15A. Also, between the exhaust manifold cover 33 and the exhaust manifold 15, FIG.
As shown in FIG. 5, both ends are open, and a cooling air passage B having a fixed gap is formed.

Numeral 34 denotes a turbine cover. As shown in FIGS. 5 and 6, the turbine cover 34 includes a pair of left and right reinforcing pipes 36, 36, an upper flange plate 37, a lower flange plate 38, and a front surface. It comprises a protection plate 39 and a pair of side surface protection plates 40, 40. Here, each reinforcing pipe 36 is formed by bending into a substantially U-shape, and the upper end portion 36A is formed to be longer than the lower end portion 36B side by a predetermined dimension C.

Reference numerals 37 and 38 denote the reinforcing pipes 3 respectively.
6 shows an upper flange plate and a lower flange plate which are attached by welding to the upper end portion 36A and the lower end portion 36B, respectively, and each of the flange plates 37 and 38 has two bolt insertion holes 37A, 37A, 38A, 38A are provided, and the flange plates 37, 38 are fastened to a turbine cover bracket 35 described later by bolts 44 described later.

Reference numeral 39 denotes a front protection plate welded to each reinforcing pipe 36 along the front side of each reinforcing pipe 36;
On both sides of the front protection plate 39, left and right side protection plates 40 formed in a substantially J-shape while gradually reducing the width from the upper end side 36A side to the lower end part 36B side of each reinforcing pipe 36. , 40 are attached to each reinforcing pipe 36 by welding.

Next, the turbine cover bracket 35 will be described with reference to FIG.

Here, the bracket 35 for the turbine cover is used.
Is composed of an engine side mounting portion 41, a connecting plate 42 and an upper end side cover mounting portion 43, which will be described later.

In the figure, reference numeral 41 denotes an engine-side mounting portion. The engine-side mounting portion 41 is made of a thick metal plate.
Screw holes 41 having female threads (not shown) at four corners
A, 41A,... Are provided in a square shape at a base end 41B, and are bent from one end of the base end 41B into a substantially L-shape with an appropriate radius of curvature, and each side of the base end 41B. A thin rectangular lower end side cover mounting portion 41D having two screw holes 41C, 41C each having a female screw (not shown) formed at the tip end thereof. It is composed of

Reference numeral 42 denotes a connecting plate. The connecting plate 42 is made of a steel plate having a substantially L-shaped cross section. The base end of the connecting plate 42 is welded to the upper side of the base end 41B of the engine-side mounting portion 41 by welding. It is fixed.

Reference numeral 43 denotes an upper end side cover attaching portion. The upper end side cover attaching portion 43 is made of a steel plate having a substantially L-shaped cross section, and extends in parallel with the lower end side cover attaching portion 41D of the engine side attaching portion 41. The connecting plate 42 is fixed to the side surface on the distal end side by welding so as to generate a height difference of a predetermined dimension C with the lower end side cover mounting portion 41D. The upper cover cover 43 has two bolt insertion holes 43 at positions corresponding to the screw holes 41C of the lower cover cover 41D.
A and 43A are formed.

The bracket 35 for the turbine cover has the above-described configuration. To attach the turbine cover 34 to the bracket 35 for the turbine cover, FIG.
As shown in the figure, first, the lower flange plate 38 of the turbine cover 34 is attached to the lower end side cover mounting portion 41D of the engine side mounting portion 41.
The upper flange plate 37 of the turbine cover 34 is brought into abutment with the upper end cover attaching portion 43. Next, the lower flange plate 38 is fixed to the lower end cover attaching portion 41D by inserting the bolts 44, 44 into the bolt inserting holes 38A, 38A, respectively, and fastening them to the screw holes 41C, 41C. The two bolts 44, 44 are inserted into the bolt insertion holes 43A, 43A and 37A, 37A of the 43 and the upper flange plate 37, and are fixed using nuts 45, 45.

The turbine cover bracket 35
Has four long bolts 46, 4 at its base end 41B.
6, and the exhaust manifold 15 is fastened to the upper surface of a bracket 15A for attaching the exhaust manifold 15 to the cylinder head 11. At this time, a cooling air passage D having a certain gap is formed outside the exhaust turbine 17 in the turbine cover 34 (see FIG. 3), and the lower end of the cooling air passage D communicates with the cooling air passage B of the exhaust manifold cover 33. It is supposed to.

The working machine engine 31 according to the present embodiment has the configuration described above, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment , the exhaust manifold
An exhaust manifold cover 33 having a substantially U-shaped cross section is attached to the cylinder head 11 so as to cover the exhaust manifold 15 from the front side , and both ends are open between the exhaust manifold cover 33 and the exhaust manifold 15. to form a cooling air passage B consisting of constant gap is, the notch upper side of 33D formed in the intermediate portion of the exhaust manifold cover 33
Is a bay that partially covers the exhaust turbine 17 from the front side.
A curved turbine cover 34 is provided, and cooling airflow is provided between the turbine cover 34 and the exhaust turbine 17.
Since the cooling air passage D composed of a fixed gap communicating with the path B via the notch 33D is formed, the following effects are obtained.

First, a cooling air is blown from the cooling fan in the direction of arrow A, whereby a cooling air passage B having both open ends is formed.
Inside, a part of the cooling air flows along the exhaust manifold 15 and the exhaust manifold cover 33. The cooling air passage D extending upward from the notch 33D of the exhaust manifold cover 33 is provided in the cooling air passage D in the direction indicated by the arrow A.
Through the gap between the exhaust turbine 17 and the turbine cover 34
In addition to flowing in from the lateral direction , the cooling air from the lower cooling air passage B is supplied through the notch 33D, and the exhaust air 17 and the turbine
The cover 34 can be cooled. Accordingly, the exhaust manifold cover 33 and the turbine cover 34 are protected from the cooling air despite being attached to the engine body 9.
Therefore, the surface is effectively cooled, and the temperature rise is suppressed as much as possible.

Therefore, according to the present embodiment, for example, during the inspection work, the worker enters the machine room 5 and
1, the exhaust manifold 15 and the exhaust turbine 17, which are particularly hot, are covered with an exhaust manifold cover 33 and a turbine cover 34 even if the worker's body touches the work machine engine 31. Since the exhaust manifold cover 33 and the turbine cover 34 are cooled by the cooling air in the cooling air passages B and D, it is possible to greatly reduce the risk of a worker being burned.

Further, the exhaust manifold 1 which becomes particularly hot
5 and the exhaust turbine 17 are the exhaust manifold cover 3
3 and the turbine cover 34, it is possible to prevent oil and the like from adhering to the exhaust manifold 15 and the exhaust turbine 17, and to greatly reduce the danger of smoking or ignition, thereby improving safety. Can be.

Further, since the cooling air passages B and D are formed, the cooling air can flow along the exhaust manifold 15 and the exhaust turbine 17 of the engine main body 9 where the temperature becomes particularly high, and the cooling of these can be efficiently performed. It can be carried out.

In the above embodiment, the case where the working machine engine of the present invention is applied to a hydraulic excavator has been described as an example. However, the present invention is not limited to this. May be used.

[0040]

As detailed [devised effect described above, according to the present invention, provided with an exhaust manifold cover for covering the exhaust manifold into the engine body partially, on its upper side provided with a turbine cover covering the exhaust turbine partially And the first and second cooling air passages formed between them, respectively.
By communicating with each other at the notch of the hold cover
And the cooling air from the cooling fan is passed through the first and second cooling air passages.
Because it has a structure in which Ru is circulated within the cooling from the cooling fan
The air flows into the first cooling air passage, and the exhaust manifold
And the exhaust manifold cover
The cooling air can be guided from the notch into the second cooling air passage.
Wear. For this reason, on the side of the second cooling air passage, the cooling fan
Cooling air from the gap between the exhaust turbine and the turbine cover
From the lateral direction through the first cooling air passage
Cooling air flows from the notch,
Cools exhaust turbine and turbine cover reliably
can do. Thus, a safety cover including the exhaust manifold cover and the turbine cover is provided.
Thus, it is possible to prevent the worker's body from coming into contact with the exhaust manifold and the exhaust turbine , which become particularly hot during operation of the work machine engine, and to prevent oil from adhering. The cooling air flowing in the first and second cooling air passages can prevent the exhaust manifold cover and the turbine cover from being heated to a high temperature. The above safety can be improved.

Further, the exhaust manifold cover is attached to the exhaust manifold.
It can be formed according to the shape of the
Bars can also be formed along the shape of the exhaust turbine
Therefore, the first cooling air passage and the second cooling air passage
Each can be formed with a certain gap, and the cooling fan
In accordance with the shape of exhaust manifold and exhaust turbine
Can be distributed. Accordingly, the cooling of the exhaust manifold and the exhaust turbine efficiency can be performed, durability of the engine working machine can Rukoto improve life.

[Brief description of the drawings]

FIG. 1 is an enlarged partial front view of a main part of a working machine engine according to an embodiment of the present invention.

FIG. 2 is a plan view showing an exhaust manifold, an exhaust turbine, and a safety cover in FIG.

FIG. 3 is an enlarged cross-sectional view in the direction of arrows III-III in FIG. 2, showing an exhaust manifold, an exhaust turbine, and a safety cover.

FIG. 4 is a perspective view showing an exhaust manifold cover.

FIG. 5 is a front view of the turbine cover shown in FIG. 3;

FIG. 6 is a sectional view taken along a line VI-VI in FIG. 5 showing the turbine cover.

FIG. 7 is a perspective view showing a bracket for a turbine cover.

FIG. 8 is an overall view showing a conventional hydraulic excavator.

FIG. 9 is a front view showing a conventional working machine engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator (working machine) 5 Machine room 9 Engine body 10 Cylinder block 11 Cylinder head 12 Intake pipe 13 Supercharger 14 Exhaust pipe 15 Exhaust manifold 17 Exhaust turbine 20 Radiator 31 Work machine engine 32 Safety cover 33 Exhaust manifold cover 34 Turbine cover 35 Bracket for turbine cover B, D Cooling air passage

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-158314 (JP, U) JP-A-53-118911 (JP, U) JP-A-63-132829 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. An engine body provided in a machine room of a work machine and having a plurality of cylinders, and an intake air provided with a supercharger at an intermediate position for supplying intake air into each cylinder of the engine body. A pipe, an exhaust pipe having an exhaust manifold for guiding exhaust gas discharged from each cylinder of the engine body to the outside, and a pipe located above the exhaust manifold.
It provided in the middle of the exhaust pipe and location, from an exhaust turbine which drives the turbocharger using the exhaust gas flow, wherein is attached to the engine body, a cooling fan for cooling the engine body together with the radiator In the engine for a working machine, a metal plate is bent into a U-shaped cross section on the engine body.
Formed by Rukoto, by covering the exhaust manifold of the exhaust pipe partially an exhaust manifold cover forming a first cooling air passage between the exhaust manifold, the exhaust in the upper exhaust manifold cover A turbine cover formed to be curved so as to partially cover the turbine and forming a second cooling air passage between the turbine cover and the exhaust turbine;
For mounting to the engine body
And a bracket for the exhaust manifold , and the exhaust manifold cover has
To allow the first cooling air passage to communicate with the second cooling air passage
A notch portion, and the cooling air from the cooling fan communicates with the first cooling air passage.
An engine for a working machine, wherein the engine is configured to flow through the second cooling air passage through a notch .