JP4707566B2 - Thermal insulation structure for construction machinery - Google Patents

Description

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

Some conventional construction machines such as hydraulic excavators are equipped with a supercharger (turbocharger) that improves engine performance by supercharging the engine.
The turbocharger has a turbine and a blower arranged coaxially, and is configured to supercharge the engine by rotating the turbine at high speed with exhaust gas discharged from the engine and driving the blower with the turbine. Yes.
The conventional supercharger is directly attached to the exhaust manifold of the engine in order to rotate the turbine at high speed using the exhaust gas energy immediately after being discharged from the engine.
For this reason, during operation of the engine, particularly in the vicinity of the turbine due to exhaust gas, the temperature in the vicinity of the turbine becomes high. Therefore, for example, Patent Document 1 and Patent Document 1 2 proposed.

In the heat shield device described in Patent Document 1, an exhaust pipe connected to an exhaust port of a supercharger directly supplied to an exhaust manifold is provided along a longitudinal direction of the exhaust manifold, and a cylinder on a side where the exhaust manifold is protruded is provided. A support plate protrudes upward from the head, and the base end of the heat shield plate is attached near the upper end of the support plate. The other end of the heat shield plate is attached to the exhaust pipe so as to cover the outside of the exhaust pipe. It has an attached structure.
Moreover, the heat shield apparatus described in Patent Document 2 is a heat insulating structure in which a heat insulating plate is formed by filling a heat insulating machine between two opposing metal plates, and the entire turbocharger is covered with the heat insulating plate. In addition, the heat insulating structure is attached to the engine side.
Japanese Patent Laid-Open No. 9-158743 Japanese Utility Model Publication No. 6-73337

However, as in the heat shield device described in Patent Document 1, in the case where the heat shield plate is directly attached to the support plate projecting from the cylinder head and the exhaust pipe, the heat of the engine and the exhaust pipe is transferred to the heat shield plate. Because of heat conduction, the heat shield itself tends to be high temperature.
For this reason, when the heat shield device described in Patent Document 1 is applied to a supercharger of a construction machine, there is a problem that a heat shield plate that has become hot is accidentally touched when performing inspection and 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 turbocharger, it does not directly touch the supercharger, but the heat from the engine side is made of a metal plate. Since heat is conducted to the heat plate and the surface of the heat shield plate becomes hot, there is a problem that the surface of the heat insulation structure is accidentally touched when performing inspection and maintenance around the engine.
In addition, since the turbocharger is entirely covered with a heat shield, the heat on the turbine side tends to be trapped in the heat insulation structure, and as a result, the supercharged intake air becomes hot, reducing the intake charge efficiency and reducing the load on the intercooler. In order to increase, there also exists a problem of having to enlarge the capacity | capacitance of an intercooler.
The present invention has been made to remedy such problems, and an object of the present invention is to provide a heat shield structure for a construction machine with improved workability and safety during inspection and maintenance.

The heat insulating structure for a construction machine according to the present invention includes an engine room in which a power engine is accommodated, an upper cover that covers a part of an upper surface opening of the engine room so as to be openable and closable, and a remaining part of the upper surface opening of the engine room A top cover that covers a part of the engine and whose upper surface serves as a passage , and a supercharger that is installed in the upper part of the engine compartment and that is driven by exhaust gas discharged from the engine to supercharge the engine A heat shield structure for a construction machine comprising: a turbocharger provided to cover at least an upper part of a turbine part, and having an upper surface fixed to a side edge of the upper cover to support the upper cover from below The support member is installed in the engine compartment , and the upper intake pipe is connected to the blower of the supercharger so as to cover the upper side of the blower .

  With this configuration, there is no risk of accidentally touching the turbocharger with parts of the hands, arms, etc. during inspection and maintenance work in the engine room, so that inspection and maintenance work can be performed without worrying about the high-temperature turbocharger. As a result, the work can be efficiently performed in a short time and the safety is also improved.

  In the heat shield structure for a construction machine according to the present invention, a supporting member is provided so as to cover at least the upper part of the turbine portion of the turbocharger, and supports a portion serving as a passage of the top cover from below, Is formed of a bracket that supports one end side of the front side of the engine chamber on the front wall of the engine compartment, and a vertical shaft that supports the other end side of the side rail.

  With the above configuration, the horizontal shaft that supports the upper surface cover serving as a passage from below serves as both a strength member that constitutes the building of the engine compartment and a heat shield member that covers the upper portion of the turbocharger. Because the horizontal support supports the weight of the worker who does the work, the top cover will not be deformed and there is no need to provide a separate heat shield cover. Reduction can be achieved.

  A heat shield structure for a construction machine according to the present invention includes a self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, an engine chamber provided on the revolving body and containing a power engine. An upper cover that covers a part of the upper surface of the engine compartment so as to be openable and closable, an upper cover that covers the remaining portion of the upper face of the engine compartment, and is driven by exhaust gas exhausted from the engine. A heat shield structure for a construction machine with a supercharger that supercharges the engine, and is provided so as to cover the upper part of the turbine part of the turbocharger and supports the part serving as the passage of the top cover from below A reed, a bracket that supports one end of the reed on the front wall of the engine compartment, a vertical reed that supports the other end of the reed, and a blower of the turbocharger, one end of which is connected from above. The side should cross diagonally above the engine Te is obtained by construction of an upper intake pipe which is the piping to the installed intercooler in front of the engine.

With the above configuration, the engine room is inspected and maintained by the upper surface cover that covers the upper part of the turbine portion of the turbocharger and the upper intake pipe that is connected to the blower side of the turbocharger and is piped so as to cover the upper side of the blower. In order to prevent parts of the body such as hands and arms from accidentally touching the turbocharger during work, inspection and maintenance work can be performed without worrying about the hot turbocharger. In addition to being efficient in time, safety is also improved.
An operator who supports the upper surface cover that has become a passage from below serves as a strength member that constitutes the building of the engine compartment and a heat shield member that covers the upper portion of the turbocharger, and passes over the upper surface cover. Because the side cover supports the weight, the top cover is not deformed and there is no need to provide a separate heat shield cover, so the cost of parts can be reduced by reducing the number of parts by simplifying the heat shield structure. .

  According to the heat shield structure for a construction machine of the present invention, there is no fear of accidentally touching the turbocharger with a part of the body such as a hand or an arm during inspection and maintenance work in the engine room. This makes it possible to carry out work without worrying about the feeder, thereby enabling efficient work in a short time and improving safety.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view of a construction machine including a hydraulic excavator, FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1, and FIG. FIG. 5 is a perspective view showing a heat shield structure.
A construction machine including a hydraulic excavator illustrated in FIG. 1 includes a traveling body 1 that can freely travel and a revolving body 2 that is rotatably disposed on the traveling body 1.
The traveling body 1 has a track frame 3 including a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a. An idler 4 is provided at one end of each side frame 3b. A sprocket 6 that is movably supported and is rotationally driven by a traveling motor 5 made of a hydraulic motor is provided on the other end side.
An endless crawler belt 7 is provided between the idler 4 and the sprocket 6, and the crawler belt 7 is driven by the sprocket 6 so that the traveling body 1 can self-propel and the side frame 3b. A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions.

The revolving unit 2 that is installed on the center frame 3a of the track frame 3 so as to be capable of swiveling is provided with a pair of parallel body frames 10 having a substantially I-shaped cross section at the bottom. A work machine 11 is mounted at the front center.
As shown in FIG. 1, the work machine 11 has a base end pivotally attached to the vehicle body frame 10, a boom 12 that can be raised and lowered by a boom cylinder 13, a base end side pivotally attached to the tip of the boom 12, and an arm cylinder 14. Is constituted by an arm 15 that can be rotated by a pivot, and a bucket 17 that is pivotally attached to the tip of the arm 15 and that can be pivoted by a bucket cylinder 16.
A cab 18 is installed on the left side of the work machine 11 at the front of the body frame 10, and an engine room 19 is installed at the rear of the body frame 10, and a power engine 20 is installed in the engine room 19. A counterweight 21 is attached to the rear end of the vehicle body frame 10.

On the other hand, the engine chamber 19 has a substantially sealed structure in which the front and rear sides are covered by a front wall 19a and a rear wall 19b, both side surfaces are covered by side covers 19c, and the upper surface is covered by an upper cover 19d, an upper cover 19f, and a center cover 19j. A part of the engine room 19 is a machine room 19g, and the engine 20 is installed horizontally on the vehicle body frame 10 in the engine room 19 as shown in FIG.
In the machine room 19g, a hydraulic pump and an auxiliary machine (both not shown) driven by the engine 20 are installed, and a large number of side covers 19c covering one side of the engine room 19 have a large number of parts. An intake port 22 made of a slit is opened.
A cooling fan 24 that is rotationally driven by the engine 20 via a fan belt 23, a compressor for air conditioner (not shown), and the like are provided at a position facing the inner surface of the side cover 19c provided with the intake port 22. In front of the cooling fan 24, a heat exchanger group 25 including a radiator, an oil cooler, and an intercooler is installed in parallel.

An exhaust manifold 20a is provided on the front side of the engine 20 installed horizontally on the vehicle body frame 10 in the engine chamber 19, and an intake manifold 20b is provided on the rear side.
The exhaust manifold 20a collects exhaust gas discharged from each combustion chamber of the engine 20 and discharges it from the exhaust port 20c. The turbine 26a side of the supercharger 26 is attached to the exhaust port 20c of the exhaust manifold 20a. .
The supercharger 26 includes a turbine 26a, a blower 26b, and a rotating shaft (not shown) that directly connects the turbine 26a and the blower 26b. It is designed to be rotated.
A silencer 28 installed at the upper part of the machine room 19g is connected to an exhaust port 26d of the turbine 26a via an exhaust pipe 27. Exhaust gas silenced by the silencer 28 is sent from the silencer 28 to the engine room. The exhaust pipe 29 projecting above 19 is discharged into the atmosphere.

The blower 26b of the supercharger 26 is driven to rotate by a turbine 26a that is rotated at high speed by exhaust gas, thereby pressurizing air sucked through an air cleaner (not shown), and is pressurized by the blower 26b. The air is sent to the intercooler 25 a of the heat exchanger group 25 through the upper intake pipe 31.
As shown in FIG. 4, one end of the upper intake pipe 31 is connected to a discharge port 26 e opened on the upper surface of the blower 26 b, and an intermediate portion of the upper intake pipe 31 is an upper surface that covers the engine 20 and the upper surface of the engine 20. A pipe is piped obliquely across the cover 19f to the cooling fan 24 side, and the other end side of the upper intake pipe 31 is connected to an upper portion of an intercooler 25a installed in front of the cooling fan 24.
As shown in FIG. 3, one end of the lower intake pipe 32 is connected to the lower part of the intercooler 25 a, and the other end side of the lower intake pipe 32 is connected to an intake manifold 20 b provided on the rear side surface of the engine 20. Thus, the intake air cooled by the intercooler 25a is supplied to the engine 20 via the intake manifold 20b.

On the other hand, the opening on the upper surface of the engine chamber 19 is divided into left and right from substantially the center, and the opening on the left side from the substantially center is covered with an upper cover 19f.
The end of the upper cover 19f on the intake port 22 side is pivotally attached to the upper surface of the engine compartment 19 by a hinge 33. The upper cover 19f can be opened and closed leftward about the hinge 33. On the open end side, a handle 34 used for opening and closing is projected.
The opening on the right side of the engine chamber 19 from the center is covered with an upper surface cover 19d.
As shown in FIG. 4, the upper surface cover 19d is divided into an upper surface cover 19h that covers a part of the engine 20 and an upper surface cover 19i that covers the machine room 19g. A plurality of slit-like exhaust ports 35 for discharging the air that has passed through the engine 20 are opened, and the side edge of the upper cover 19 h that covers a part of the engine 20 is located beside the support member 36 provided at the upper part of the engine chamber 19. It is fixed to the upper surface of the flange 36a by a fixing tool 37.
As shown in FIG. 5, the support member 36 includes, for example, a horizontal bar 36a formed by bending a single steel plate into a substantially L-shaped cross section, and a prismatic vertical bar 36b that supports one end side of the horizontal bar 36a from below. Become.

The top cover 19h that covers a part of the engine 20 and the center cover 19j that covers the front of the engine room 19 are used when checking or maintaining the engine 20 installed in the engine room 19 or auxiliary limbs such as an air conditioner compressor. Therefore, the support member 36 that supports the upper surface cover 19h from below has a strength that can sufficiently withstand the load when the worker rides.
The horizontal rod 36a of the support member 36 is provided so as to cover the upper portion of the turbine 26a of the supercharger 26 installed near the upper center of the engine chamber 19, and is connected to the blower 26b of the supercharger 26 from above. The upper intake pipe 31 is configured to cover the high temperature portion of the supercharger 26, particularly the upper portion of the turbine 26a so as not to accidentally touch the turbine 26a.
The lower end portion of the vertical rod 36b that supports one end side of the horizontal rod 36a from below is erected on the upper part of the engine support member 10a fixed to the vehicle body frame 10 as shown in FIG. A wide portion 36 c is formed on the end side, and the wide portion 36 c is fixed to the upper surface of the bracket 38 protruding from the front wall 19 a of the engine chamber 19 by a fixing tool 37.

Next, the operation of the heat shield structure of the construction machine constructed as described above will be described.
While the construction machine is in operation, the upper cover 19f covers the upper surface opening of the engine chamber 19 as shown in FIGS.
When checking or servicing the inside of the engine compartment 19 from this state, the engine covers the center cover 19j or the top cover 19h from the hydraulic oil tank 39 side, and opens the upper cover 19f to the left side of the engine compartment 19 around the hinge 33. The inspection and maintenance work is started. At this time, the range surrounded by the oblique lines of the upper surface cover 19h and the center cover 19j shown in FIG. 4 is provided for the worker's passage.

The inspection operation in the engine room 19 includes loosening of the fan belt 23 of the cooling fan 24, loosening of a belt (not shown) for linking the air conditioner compressor and the engine 20, the amount of engine oil, the amount of cooling water, etc. However, since these operations are performed while moving along the passage on the upper surface cover 19h, in the inspection and maintenance immediately after the engine 20 is stopped, it is easy to accidentally touch the supercharger 26 that has become hot.
However, in the embodiment of the present invention, the turbocharger 26 installed on the upper portion of the engine compartment 19 is covered with the side wall 36a of the support member 36 and the upper surface cover 19h as shown in FIG. It has become.
Further, since the upper intake pipe 31 connected to the blower 26b side of the supercharger 26 is piped so as to cover the upper side of the blower 26b, a body such as a hand or an arm is accidentally attached to the supercharger 26 during inspection and maintenance work. As a result, 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 performed efficiently in a short time and safety is also improved.

  On the other hand, the horizontal rod 36a of the support member 36 that supports the upper surface cover 19h that is a passage from below serves as a strength member that constitutes the building of the engine room 19 and a heat shield member that covers the supercharger 26, Since the support member 36 supports the weight of the operator who passes on the upper surface cover 19h, the upper surface cover 19h is not deformed, and it is not necessary to provide a separate heat shield cover. By reducing the number of parts, effects such as reduction of parts cost can be obtained.

In the above-described embodiment, the case where the supercharger 26 is a hydraulic excavator in which the supercharger 26 is installed in the upper part on the front side of the engine chamber 19 has been described. In some cases, it can be similarly implemented.
Further, the present invention is not limited to a hydraulic excavator, and can be applied to all construction machines that use an engine 20 equipped with a supercharger 26 as a power source.

It is a side view of the construction machine which employ | adopted the heat insulation structure which becomes embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is an arrow view from the C direction of FIG. It is a perspective view of the supporting member which comprises the heat insulation structure of the construction machine which becomes embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 19 Engine chamber 19a Front wall 19d Upper surface cover 19f Upper cover 19h Upper surface cover 20 Engine 25a Intercooler 26 Supercharger 26a Turbine 26b Blower 31 Upper intake pipe 36 Support member 36a Horizontal rod 36b Vertical shaft

Claims (3)

An engine chamber in which the engine for power is accommodated, an upper cover that covers a part of the upper surface opening of the engine chamber so as to be openable and closable, a remaining part of the upper surface opening of the engine chamber, and a part of the engine A construction machine comprising an upper surface cover that covers the upper surface of the engine chamber, and a supercharger that is installed in an upper portion of the engine chamber and that is driven by exhaust gas discharged from the engine to supercharge the engine. The heat shielding structure of
A support member that is provided so as to cover at least an upper portion of the turbine portion of the supercharger and that has an upper surface fixed to a side edge portion of the upper surface cover and supports the upper surface cover from below ; A heat shield structure for a construction machine, wherein an upper intake pipe is connected to the blower of the supercharger so as to cover the upper side of the blower .   A support that is provided so as to cover at least the upper part of the turbine portion of the supercharger, and that supports a portion serving as a passage of the upper surface cover from below, and one end side of the support is disposed in the engine chamber The heat-insulating structure for a construction machine according to claim 1, wherein the heat shield structure is formed of a bracket that is supported on the front wall and a vertical rod that supports the other end of the horizontal rod.   A self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, an engine chamber provided on the revolving body and containing a power engine, and a part of an upper surface of the engine chamber An upper cover that covers the engine chamber in an openable and closable manner, an upper surface cover that covers the rest of the upper surface of the engine compartment, and an exhaust gas that is installed in the upper part of the engine compartment and that is driven by exhaust gas discharged from the engine. A heat insulating structure for a construction machine including a supercharger for feeding, wherein the heat shield structure is provided so as to cover an upper portion of a turbine portion of the supercharger and supports a portion serving as a passage of the upper surface cover from below. A hook, a bracket that supports one end side of the horizontal bar on the front wall of the engine compartment, a vertical bar that supports the other side of the horizontal bar, and one end side connected to the blower of the supercharger from above. The other end is the engine Heat insulating structure for a construction machine characterized by comprising an upper intake pipe which is the piping to the installed intercooler in front of the engine so as to cross the upper diagonally.

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