KR101050643B1 - Thermal insulation of construction machinery - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat shield structure of a construction machine that improves workability and safety during inspection and maintenance.

The engine compartment 19 in which the power engine 20 is accommodated, the upper cover 19f which covers a part of the upper surface of the engine compartment 19 so that opening and closing is possible, and the upper cover which covers the remaining part of the upper surface of the engine compartment 19. 19d and the engine compartment of the construction machine provided with the supercharger 26 which is installed in the upper part in the engine compartment 19, and is driven by the exhaust gas discharged from the engine 20, and supercharges the engine 20 ( The inspection and maintenance work provided in the 19) which provided the support member 36 which covers at least the upper part of the turbine 26a part of the turbocharger 26, and supports the part used as the passage of the upper surface cover 19h from below. Since there is no possibility that a part of the body such as a hand or an arm contacts the supercharger 26 by mistake, the inspection and maintenance work in the engine compartment 20 can be performed without worrying about the high temperature turbocharger 26. Work can be performed efficiently in a short time, and safety is also improved.

Engine compartment, supercharger, turbine, engine, support member, top cover

Description

Heat shield structure of construction machinery {HEAT BLOCKING STRUCTURE OF CONSTRUCTION MACHINERY}

1 is a side view of a construction machine employing a heat shield structure according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view along the line B-B in FIG.

4 is a view from the direction C of FIG. 3;

Fig. 5 is a perspective view of the supporting member constituting the heat shield structure of the construction machine according to the embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: traveling body

2: swinging structure

19: engine compartment

19a: front wall

19d: top cover

19f: top cover

19h: top cover

20: engine

25a: inter cooler

26: supercharger

26a: turbine

26b: blower

31: upper intake pipe

36 support member

36a: Lateral lever

36b: Bell Lever

[Document 1] Japanese Unexamined Patent Application Publication No. 9-158743

[Document 2] Japanese Utility Model Publication Hei 6-73337

The present invention relates to a heat shield structure of a construction machine having a supercharger for supercharging an engine.

Background Art Conventionally, a construction machine such as a hydraulic excavator is equipped with a supercharger (turbocharger) for improving engine performance by supercharging an engine.

The turbocharger is provided with a turbine and a blower coaxially, and is configured to supercharge the engine by rotating the turbine at high speed by the exhaust gas discharged from the engine and driving the blower by the turbine.

In addition, the conventional supercharger is installed directly in the exhaust manifold of the engine in order to rotate the turbine at high speed using exhaust gas energy immediately after being discharged from the engine.

For this reason, since the exhaust gas, especially the vicinity of a turbine, becomes high temperature during operation of an engine, the heat shield of the supercharger for the purpose of preventing the supercharger from contacting accidentally is proposed by patent document 1 or 2, for example. It is.

The heat shield described in Patent Document 1 is provided with an exhaust pipe connected to an exhaust port of a supercharger directly connected to the exhaust manifold along the longitudinal direction of the exhaust manifold, and is supported upward from the cylinder head on the side where the exhaust manifold is protruded. Is provided so that the base end of the heat shield plate is provided near the upper end of the support plate, and the other end side of the heat shield plate is provided in the exhaust pipe so as to cover the outside of the exhaust pipe.

In addition, the heat shield device described in Patent Document 2 forms a heat shield plate by filling an insulator between two opposite metal plates, forms a heat insulation structure covering the entire supercharger with the heat shield plate, and at the same time, the heat insulation structure is provided on the engine side. It is installed in the configuration.

[Patent Document 1] Japanese Patent Application Laid-Open No. 9-158743

[Patent Document 2] Japanese Utility Model Publication No. Hei 6-73337

However, in the case where the heat shield plate is installed directly on the support plate and the exhaust pipe protruding from the cylinder head, as in the heat shield device described in Patent Document 1, the heat shield plate itself becomes hot because the heat of the engine or the exhaust pipe is thermally conducted to the heat shield plate. easy.

For this reason, when the heat shielding device described in Patent Document 1 is applied to a supercharger of a construction machine, there is a problem that the heat shielding plate which has become hot will be inadvertently contacted when performing inspection or maintenance around the engine.

On the other hand, in the heat shield device described in Patent Document 2, since the heat insulating structure covers the entire supercharger, the supercharger does not come into contact with the supercharger. When performing inspection and maintenance around the engine, there is a problem of accidentally coming into contact with the surface of the heat insulating structure.

In addition, due to the structure of covering the entire supercharger by the heat shield plate, the heat on the turbine side is easy to be filled in the thermal insulation structure, and as a result, the supercharged intake becomes high temperature, which reduces the intake charge efficiency and increases the burden on the inter cooler. Another problem is that the capacity of the cooler must be increased.

The present invention has been made to improve such a problem, and an object of the present invention is to provide a heat shield structure of construction machinery that improves workability and safety during inspection and maintenance.

The heat shield structure of the construction machine according to the present invention includes an engine compartment in which a power engine is accommodated, an upper cover which covers a part of the upper surface of the engine compartment so as to be openable and close, an upper cover which covers the remaining part of the upper surface of the engine compartment, and an upper portion in the engine compartment. A heat shield structure of a construction machine provided with a supercharger installed to be driven by exhaust gas discharged from the engine and supercharging the engine, and installed so as to cover at least the upper portion of the turbine portion of the supercharger, and serving as a passage of the top cover. The support member which supports a part from below is provided in the engine compartment.

With the above configuration, there is no possibility that a part of the body such as a hand or an arm is accidentally brought into contact with the supercharger during the inspection and maintenance work in the engine compartment, and thus the inspection and maintenance work can be performed without worrying about the high temperature supercharger. This can be performed efficiently in a short time, and safety is also improved.

The heat shield structure of the construction machine of the present invention is provided with a supporting member covering the at least the upper portion of the turbine portion of the supercharger, and a horizontal lever supporting the portion serving as a passage of the top cover from below, and one end side of the horizontal lever in the engine compartment. It is formed by the bracket which supports a front wall, and the longitudinal lever which supports the other end side of a horizontal lever.

By the said structure, the horizontal lever which supports the upper surface cover used as the passage | path serves as the strength member which comprises the building of an engine room, and the heat shield member which covers the upper part of a supercharger, and transverses the weight of the worker which passes over an upper surface cover. Since the lever supports, the top cover does not deform and there is no need to separately install the heat shield cover, so that the cost of parts can be reduced by reducing the number of parts by simplifying the heat shield structure.

The heat shield structure of the construction machine of the present invention includes a traveling body capable of running on its own, a swinging body rotatably provided on the traveling body, an engine chamber installed in the swinging body and containing a power engine, and a part of the upper surface of the engine chamber. A construction machine having an upper cover that covers the opening and closing, an upper cover that covers the remaining portion of the upper surface of the engine compartment, and a supercharger installed at the upper portion of the engine compartment and driven by exhaust gas discharged from the engine to supercharge the engine. And a horizontal lever which is provided so as to cover an upper portion of the turbine portion of the supercharger, and which supports a portion which becomes a passage of the upper cover from below, a bracket for supporting one end side of the horizontal lever on the engine room front wall, One end side is connected from the upper side to the longitudinal lever supporting the other end side of the lateral lever, and the blower of the supercharger, and the other end side is obliquely extending upward of the engine. It is configured with an upper suction pipe organ so as to LE in inter cooler is installed on the front of the engine.

By the above configuration, the supercharger is accidentally in the engine compartment during the maintenance work in the engine compartment by the upper cover which covers the upper part of the turbine part of the supercharger and the upper intake engine which is connected to the blower side of the supercharger and is piped so as to cover the upper part of the blower. Since a part of a body such as a hand or an arm is prevented from coming into contact with each other, the inspection and maintenance work can be performed without worrying about a high temperature supercharger, whereby the work can be efficiently performed in a short time and the safety is improved.

Moreover, the horizontal lever which supports the upper surface cover used as a passage | path serves as the strength member which comprises the building of an engine room, and the heat shield member which covers the upper part of a supercharger, and the horizontal lever supports the weight of the operator who passes through the upper cover. Therefore, since the top cover does not deform and there is no need to provide a heat shield cover separately, the cost of parts can be reduced by reducing the number of parts by simplifying the heat shield structure.

Embodiments of the present invention will be described in detail with reference to the drawings.

1 is a side view of a construction machine made of a hydraulic shovel, FIG. 2 is an enlarged sectional view along line AA of FIG. 1, FIG. 3 is an enlarged sectional view along line BB of FIG. 1, FIG. 4 is an arrow from the C direction of FIG. 5 is a perspective view showing a heat shield structure.

The construction machine which consists of the hydraulic shovel shown in FIG. 1 consists of the traveling body 1 which can run by itself, and the turning body 2 provided so that rotation is possible on the traveling body 1.

The traveling body 1 has the center frame 3a and the track frame 3 which consists of a pair of side frame 3b provided so that it may be parallel to each other, and the idler is provided in the one end side of each side frame 3b. (4) is supported to be movable back and forth, and the sprocket 6 which is rotationally driven by the traveling motor 5 which consists of a hydraulic motor is provided in the other end side.

Between the idler 4 and the sprocket 6, an endless toothed rod 7 is wound and mounted, and the traveling body 1 can be frequently driven by driving the toothed rod 7 with the sprocket 6. At the same time, a plurality of rotary wheels 8 are rotatably supported on the upper and lower portions of the side frame 3b.

The swinging structure 2 rotatably provided on the center frame 3a of the track frame 3 is provided with a pair of body frame 10 parallel to each other formed in a substantially I-shaped cross section at the bottom. The work machine 11 is attached to the center of the front portion of the vehicle body frame 10.

As shown in Fig. 1, the work machine 11 has a proximal end pivotally attached to the vehicle body frame 10, and a proximal end at the distal end of the boom 12 and the boom 12 which are undulating material by the boom cylinder 13. The side is coated, and the arm cylinder 14 is pivotally attached to the arm 15 and the tip of the arm 15, and the bucket cylinder 16 is pivotally attached to the bucket 17. Consists of.

In the front part of the body frame 10, the cab 18 is provided in the left side of the work machine 11, and the engine room 19 is provided in the rear part of the body frame 10, and in this engine room 19, The engine 20 for power is accommodated, and the counter weight 21 is provided in the rear end of the vehicle body frame 10.

On the other hand, the engine compartment 19 has front and rear sides by the front wall 19a and rear wall 19b, both sides by the side cover 19c, and the top surface by the top cover 19d and the top cover 19f. And a substantially sealed structure covered by the center cover 19j, a part of the engine compartment 19 serves as a machine compartment 19g, and on the body frame 10 in the engine compartment 19, as shown in FIG. As shown, the engine 20 is provided in a horizontal arrangement.

In the machine room 19g, a hydraulic pump driven by the engine 20 or an auxiliary machine (not shown in any of them) is provided, and a plurality of upper portions of the side cover 19c covering one side of the engine room 19 are provided. The inlet port 22 made of a slit of the opening is opened.

At the position opposite to the inner surface of the side cover 19c provided with the intake port 22, a cooling fan 24 which is rotationally driven by the engine 20 via the fan belt 23, a compressor for air conditioner (not shown), etc. The heat exchanger group 25 which consists of a radiator, an oil cooler, and an intercooler is provided in parallel in front of the cooling fan 24. As shown in FIG.

The exhaust manifold 20a is provided in the front side surface of the engine 20 provided in the horizontal direction on the vehicle body frame 10 in the engine compartment 19, and the intake manifold 20b is provided in the rear side surface.

The exhaust manifold 20a collects exhaust gas discharged from each combustion chamber of the engine 20 and discharges it from the exhaust port 20c, so that the turbine 26a of the supercharger 26 is exhausted to the exhaust port 20c of the exhaust manifold 20a. ) Side is installed.

The supercharger 26 is comprised of the turbine 26a and the blower 26b, and the rotating shaft (not shown) which connects these turbine 26a and the blower 26b directly from the exhaust port 20c of the exhaust manifold 20a. The turbine 26a is rotated at high speed by the exhaust gas discharged.

The silencer 28 provided in the upper part of the machine room 19g is connected to the exhaust port 26d of the turbine 26a via the exhaust pipe 27, and the exhaust gas which was silenced by the silencer 28 is sent from the silencer 28 to the engine. The exhaust cylinder 29 protruding upward of the chamber 19 is discharged to the atmosphere.

The blower 26b of the supercharger 26 is rotationally driven by the turbine 26a rotated by the exhaust gas, so as to pressurize the air sucked through the air cleaner (not shown) and pressurized by the blower 26b. Air is conveyed to the inter cooler 25a of the heat exchanger group 25 via the upper inlet pipe 31.

As shown in Fig. 4, the upper intake pipe 31 has one end side connected to the discharge port 26e opened on the upper surface of the blower 26b, and the middle portion of the upper intake pipe 31 is It is piped to the cooling fan 24 side by obliquely crossing the upper surface and the upper cover 19f covering the engine 20, and the other end side of the upper intake pipe 31 is provided in front of the cooling fan 24. It is connected to the upper part of the inter cooler 25a.

As shown in Fig. 3, one end side of the lower intake pipe 32 is connected to the lower portion of the inter cooler 25a, and the other end side of the lower intake pipe 32 is provided on the rear side of the engine 20. The intake air connected to the fold 20b and cooled by the inter cooler 25a is supplied to the engine 20 via the intake manifold 20b.

On the other hand, the upper surface opening part of the engine compartment 19 is divided from the center to the left and right, and the opening part of the left side from the substantially center is covered by the upper cover 19f.

The inlet port 22 side end portion of the upper cover 19f is pivotally attached to the upper surface of the engine compartment 19 by the hinge 33, and the upper cover 19f can be opened and closed around the hinge 33 in the left direction. On the open end side of the upper cover 19f, a handle 34 for opening and closing is protruded.

The opening part on the right side from almost the center of the engine compartment 19 is covered by the upper surface cover 19d.

The top cover 19d is divided into the top cover 19h which covers a part of the engine 20, and the top cover 19i which covers the machine room 19g, as shown in FIG. 4, and each top cover 19h. 19i, a plurality of slit-type exhaust ports 35 for discharging air passing through the engine chamber 19 are opened, and the side edges of the upper cover 19h covering a part of the engine 20 are engine chamber 19 It is fixed to the upper surface of the horizontal lever 36a of the support member 36 provided on the upper side by the fixing attachment hole 37.

As shown in Fig. 5, the supporting member 36 supports the horizontal lever 36a formed by bending one sheet of steel sheet into an almost L-shaped cross section, and one end side of the horizontal lever 36a from below. It consists of a longitudinal lever (36b) of each column.

An upper cover 19h covering a part of the engine 20 and a center cover 19j covering the front of the engine compartment 19 may be used to support auxiliary rods such as an engine 20 installed in the engine compartment 19 or an air conditioner compressor. Since it is used as a passage at the time of inspection or maintenance, the support member 36 which supports the upper surface cover 19h from below can fully endure the load at the time of a worker's ride.

The horizontal lever 36a of the support member 36 is provided so as to cover the upper side of the turbine 26a of the turbocharger 26 provided near the center upper part of the engine compartment 19, and the blower 26b of the turbocharger 26 is provided. The upper intake pipe 31 connected from above to the upper portion of the turbine 26a covers the upper portion of the turbocharger 26 so as not to accidentally contact the high temperature portion of the turbocharger 26, in particular the turbine 26a.

As shown in FIG. 3, the lower end of the longitudinal lever 36b which supports the one end side of the horizontal lever 36a is installed in the upper part of the engine support member 10a fixedly attached to the vehicle body frame 10, and The wide end portion 36c is formed on the other end side of the horizontal lever 36a, and the wide end portion 36c is fixed to the upper surface of the bracket 38 protruding from the front wall 19a of the engine compartment 19. It is fixed by (37).

Next, the operation of the heat shield structure of the constructed construction machine will be described.

While the construction machine is in operation, the upper cover 19f is covered with the top opening of the engine compartment 19 as shown in Figs.

When checking or maintaining the inside of the engine compartment 19 from this state, the upper cover 19f is mounted on the center cover 19j or the top cover 19h from the hydraulic oil tank 39 side and centered on the hinge 33. ) Is opened to the left side of the engine chamber 19 and inspection or maintenance work is started, but the range surrounded by the diagonal lines of the upper cover 19h and the center cover 19j shown in FIG. Is provided.

As inspection work in the engine compartment 19, the fan belt 23 of the cooling fan 24 is loosened, the belt (not shown) which connects the compressor for engines with the engine 20, the flow rate of engine oil, and coolant Although inspection of quantity and the like is mainly performed, these operations are performed while moving the passage on the top cover 19h. Therefore, in the inspection and maintenance immediately after stopping the engine 20, the supercharger 26 that has become hot has been easily inadvertently contacted. do.

However, in the embodiment of the present invention, the turbine 26a side of the turbocharger 26 provided in the upper part of the engine chamber 19, as shown in FIG. 4, has a horizontal lever 36a and an upper cover of the support member 36. As shown in FIG. (19h) is covered.

In addition, since the upper intake pipe 31 connected to the blower 26b side of the turbocharger 26 is piped so as to cover the upper side of the blower 26b, the supercharger 26 is accidentally hand or arm during the inspection and maintenance work. There is no fear that a part of the body, such as the back, will come into contact with each other, so that the inspection and maintenance work in the engine compartment 19 can be performed without worrying about the high temperature supercharger 26, so that the work can be efficiently performed in a short time and the safety is improved. .

On the other hand, the horizontal lever 36a of the support member 36 which supports the upper surface cover 19h used as a passage | path covers the strength member which comprises the building of the engine compartment 19, and the heat shield member which covers the upper part of the supercharger 26. Since the support member 36 supports the weight of the worker passing through the top cover 19h, the top cover 19h is not deformed and the heat shield does not need to be separately installed. Effects such as simplification of the structure and reduction of the number of parts can also reduce the part cost.

In addition, in the above embodiment, the case of the hydraulic excavator installed in the upper part of the front side of the engine compartment 19 has been described, but the hydraulic excavator in which the supercharger 26 is installed in the upper part of the rear side of the engine compartment 19 is described. Also in this case, it can implement.

Moreover, it is applicable to the whole construction machine which uses the engine 20 in which the supercharger 26 is mounted as a power source, without being limited to a hydraulic shovel.

According to the heat shield structure of the construction machine of the present invention, there is no possibility that a part of the body such as a hand or an arm touches the supercharger accidentally during the inspection maintenance work in the engine compartment, so that the maintenance work can be performed without worrying about the high temperature supercharger. As a result, the work can be efficiently performed in a short time, and the safety is also improved.

Claims (3)

An engine compartment accommodating a power engine, an upper cover covering a part of the upper opening of the engine compartment so as to be openable and closed, and a remaining portion of the upper opening of the engine compartment; A heat shield structure of a construction machine including an upper cover and a lower part of the upper cover and an upper part of the engine compartment and a supercharger driven by exhaust gas discharged from the engine to supercharge the engine. The heat shield structure of the construction machine provided with the support body which covers at least the upper part of a turbine part, and supports the said top cover from below. The horizontal lever which is provided so that the said support member may cover at least the upper part of a turbine part of the said supercharger, and which supports the part used as the passage of the said top cover from below, and the one end side of the said horizontal lever is said The heat shield structure of the construction machine formed from the bracket which supports the engine room front wall, and the longitudinal lever which supports the other end side of the said horizontal lever. A self-driving traveling body, a swinging structure rotatably provided on the traveling body, an engine compartment mounted on the swinging structure and containing a power engine, and an upper cover which covers a part of the upper surface of the engine compartment so as to be openable and openable. And a top cover covering the remaining portion of the upper surface of the engine compartment, and a supercharger installed at an upper portion in the engine compartment and driven by exhaust gas discharged from the engine to supercharge the engine. It is a structure and is provided so as to cover the upper part of the turbine part of the supercharger, and a horizontal lever for supporting a portion which becomes a passage of the upper cover from below, and a bracket for supporting one end side of the horizontal lever on the engine room front wall. One end side is connected to the longitudinal lever supporting the other end side of the lateral lever and the blower of the supercharger from above, and the other end side is And an upper intake engine piped to an inter cooler installed in front of the engine so as to cross the upper side of the engine obliquely.

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