JP4983040B2 - Wheeled work machine - Google Patents

Description

 The present invention relates to a wheel-type work machine such as a wheel crane, and particularly relates to an engine in which an engine is mounted on an upper swing body.

Conventionally, as this type of wheel-type work machine, for example, as disclosed in Patent Document 1, an upper swing body is mounted on a lower traveling body so as to be capable of swinging, and a telescopic boom is provided at the center in the width direction of the upper swing body. An engine room that can be undulated and houses a cab (operator's cab) on the front side of one side in the width direction of the upper revolving structure, and an engine and its accessories (heat exchanger, etc.) on the rear side. Each of which is provided with a hydraulic oil tank, a fuel tank, and the like on the other side portion in the width direction of the upper swing body is known.
Japanese Patent Laid-Open No. 2004-136922

  However, in the above-mentioned conventional one, sufficient consideration is not given to the size of the engine room and the intake structure provided behind the cab, so that noise of the engine or the like is easily diffused to the cab side and the periphery, and the engine There is a problem that the amount of intake air into the room is insufficient and the cooling performance of the heat exchanger decreases.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce noise by providing sufficient consideration for the size and intake structure when the engine room is provided behind the cab. At the same time, it is intended to provide a wheel type work machine that can improve the cooling performance of the heat exchanger by increasing the amount of intake air into the engine compartment.

  In order to solve the above-mentioned problems, the invention according to claim 1 is such that the upper swing body is turnably mounted on the lower traveling body, and the telescopic boom is disposed at the center in the width direction of the upper swing body so as to be raised and lowered. In addition, in a wheel-type work machine in which a cab is provided on one side in the width direction of the upper swing body, an engine room having substantially the same height and width as the cab is provided behind the cab, The air intake chamber, heat exchanger, cooling fan, engine, and hydraulic pump are arranged in series from the front side, and an air intake portion that guides outside air to the air intake chamber is provided on the ceiling corresponding to the air intake chamber of the engine chamber. .

  In this configuration, since the engine room having substantially the same height and width as the cab is provided behind the cab, the engine room can be made as large as possible without increasing the overall width and height of the work machine. Therefore, a sound insulation structure or the like can be easily adopted in the engine room. Further, since a relatively large intake chamber is secured on the front side of the engine room, that is, on the cab side, noise accompanying intake air can be reduced and propagation of engine noise or the like to the cab side can be suppressed. In addition, since an air intake portion that guides outside air to the air intake chamber is provided in the ceiling portion corresponding to the air intake chamber of the engine compartment, traveling air can be easily guided to the air intake chamber as outside air through the air intake portion when the work machine is traveling. it can.

  The inventions according to claims 2 to 4 each provide a preferable form of the air intake portion provided on the ceiling portion in the wheel type work machine according to claim 1.

  That is, in the invention according to claim 2, the air intake portion is connected to one air intake port provided in the ceiling portion, and one end of the air intake port is rotatably connected to the edge portion of the air intake port via the support shaft. The intake duct is provided so that it can be switched between an open position for projecting outside to guide the traveling wind to the intake port and a closed position for storing the intake air in the intake port and closing the intake port. Make the configuration.

  In this configuration, when the work machine travels with the intake duct switched to the open position, the traveling wind is efficiently guided into the intake chamber through the intake port of the ceiling portion by the intake duct projecting outside. When a place with a height restriction is encountered, the overall height can be reduced by storing the intake duct in the intake port and switching to a closed position where the intake port is closed. In addition, since the air inlet of the ceiling is closed by the air intake duct in this closed position, it is possible to prevent foreign matters such as rainwater and dust from entering the air intake chamber.

  According to a third aspect of the present invention, there is provided a single rectangular intake port provided by opening the intake portion in the ceiling portion, and a central portion between the two opposite sides of the intake port via a support shaft. A first position where one end side closes to the intake port and the other end side opens away from the intake port, and one end side is the intake port. It is configured to be provided so as to be switched to a second position that opens away from and closes the other end close to the intake port. In this configuration, by switching the intake duct between the first position and the second position, the opening side of the intake duct can be changed in two directions depending on the situation.

  According to a fourth aspect of the present invention, the air intake section includes an air intake opening provided in the ceiling portion, and an air intake duct that covers the upper portion of the air intake opening and guides the traveling wind to the air intake opening. The intake duct is detachably attached to the ceiling.

  In this configuration, when the work machine is traveling, the traveling air is efficiently guided into the intake chamber through the intake port of the ceiling portion by the intake duct attached to the ceiling portion. In addition, when encountering a place with a height restriction, the overall height can be reduced by removing the intake duct. Moreover, since the air intake duct is attached to the ceiling portion so as to cover the upper side of the air intake port, foreign matter such as rainwater and dust can be prevented from entering the air intake chamber.

  According to a fifth aspect of the present invention, in the wheel type work machine according to the fourth aspect, the intake duct is configured such that the direction of the intake duct can be changed in two or more directions by appropriately setting, for example, a bolt fastening portion. . In this configuration, the direction of the intake duct attached to the ceiling can be changed according to the situation.

  According to a sixth aspect of the present invention, in the wheel type work machine according to any one of the second to fifth aspects, the outside air is introduced into the intake chamber from an intake port provided separately from the intake portion of the ceiling portion. Make the configuration. In this configuration, since the outside air is also introduced into the air intake chamber from the air intake provided separately from the air intake of the ceiling, the air intake duct is stored in the air intake especially in the wheel type work machine according to claim 2. Even when the intake port is switched to the closed position, the intake air amount to the intake chamber can be sufficiently secured.

  According to a seventh aspect of the present invention, in the wheel type work machine according to any one of the first to sixth aspects, a sound absorbing material is provided on the inner surface of the intake chamber. In this configuration, since the noise in the intake chamber is absorbed by the sound absorbing material, it is possible to suppress the diffusion of noise to the cab on the front side of the intake chamber and the surroundings.

According to an eighth aspect of the present invention, in the wheel type work machine according to any one of the second to fifth aspects, a sound absorbing material is provided on an inner surface of the intake duct. In this configuration, it is possible to suppress the noise in the intake chamber from diffusing from the inlet of the ceiling portion to the outside by the sound absorbing material provided on the inner surface of the intake duct.

  As described above, according to the wheel type work machine of the present invention, since the engine room having substantially the same height and width as the cab is provided behind the cab, the overall width and height of the work machine are not increased. The engine room can be made as large as possible, and noise reduction can be easily achieved by adopting a sound insulation structure or the like in the engine room. In addition, since a relatively large intake chamber is secured on the cab side of the engine compartment, it is possible to reduce noise caused by intake air and to suppress the propagation of noise to the cab side. Noise can be further reduced. Moreover, since an air intake portion that guides outside air to the air intake chamber is provided in the ceiling portion corresponding to the air intake chamber of the engine compartment, traveling air can be easily guided to the air intake chamber through the air intake portion when the work machine is traveling, It can contribute to the improvement of the cooling performance of the heat exchanger.

  In particular, in the invention according to claim 2, since the running wind can be efficiently guided into the intake chamber through the intake port of the ceiling portion by the intake duct projecting outside, the cooling performance of the heat exchanger is greatly improved. Can do. Further, even when encountering a place where the height is restricted, the overall height can be reduced by storing the intake duct in the intake port and closing the intake port, which does not hinder traffic. Moreover, since the air inlet of the ceiling portion is closed by the air intake duct at the closed position of the air intake duct, it is possible to prevent foreign matters such as rainwater and dust from entering the air intake chamber.

  In the invention according to claim 3, since the opening side of the air intake duct that guides the traveling wind to the air inlet of the ceiling portion can be changed in two directions according to the situation, the noise in the cab when the air inlet is directed rearward It is possible to effectively reduce the temperature and improve the cooling performance of the heat exchanger according to the situation.

  In the invention according to claim 4, since the traveling wind can be efficiently guided to the intake chamber through the intake port of the ceiling portion by the intake duct attached to the ceiling portion, the cooling efficiency of the heat exchanger can be greatly improved. it can. In addition, when encountering a place where the height is restricted, the overall height can be reduced by removing the air intake duct, which does not hinder traffic. In addition, since the air intake duct is attached to the ceiling so as to cover the upper side of the air intake port, foreign matter such as rainwater and dust can be prevented from entering the air intake chamber.

  In the invention which concerns on Claim 5, since the direction of the air intake duct attached to a ceiling part can be changed according to a situation, the noise reduction in a cab when an air inlet is turned back, and the cooling performance of a heat exchanger Can be effectively improved according to the situation.

  In the invention according to claim 6, since the outside air is introduced into the intake chamber from the intake port provided separately from the intake port of the ceiling portion, the intake duct is particularly provided in the wheel type work machine according to claim 2. Even when the intake port is switched to the closed position where it is stored in the intake port, or when the intake duct is removed from the ceiling in the wheel type work machine according to claim 4, the intake air amount to the intake chamber is sufficiently increased. Therefore, it is effective in implementing these.

  In the invention according to claim 7, since the noise in the intake chamber is absorbed by the sound absorbing material provided on the inner surface of the intake chamber, the diffusion of noise to the cab on the front side of the intake chamber and the surroundings can be suppressed, and noise can be reduced. Can be further improved.

  Furthermore, in the invention according to claim 8, since the noise in the intake chamber can be prevented from diffusing from the inlet of the ceiling portion to the outside by the sound absorbing material provided on the inner surface of the intake duct, the noise can be further reduced. Can be planned.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 shows the structure of an upper turning body of a wheel type work machine according to a first embodiment of the present invention. Although this upper turning body 1 is not shown, it is mounted on a lower traveling body having a plurality of wheels so as to be turnable via a turning device. A pair of left and right upper frames 2, 2 extending in the front-rear direction are disposed, and telescopic booms (not shown) such as telescopic booms are mounted on the upper frames 2, 2 so as to be undulated.

  A cab 3 is provided on the left side of the upper swing body 1 in the width direction, and an engine chamber 4 having substantially the same height and width as the cab 3 is substantially continuous with the cab 3 behind the cab 3. Is provided. Although not shown, a hydraulic oil tank, a fuel tank, and the like are disposed on the right side in the width direction of the upper swing body 1.

  In the engine chamber 4, an intake chamber 5, a heat exchanger 6, a cooling fan 7, an engine 8 and a hydraulic pump 9 are arranged in series from the front side, that is, the cab 3 side. Of the inner surface of the intake chamber 5, plate-like sound absorbing materials 11 and 12 made of urethane foam or the like are fixed to the front wall surface and the floor surface, respectively. The ceiling portion 4 a corresponding to the intake chamber 5 of the engine chamber 4 is provided with an intake portion 13 that guides outside air to the intake chamber 5, while the floor portion on the rear side of the engine chamber 4 includes a plurality of openings. An exhaust part 14 is provided.

  As shown in an enlarged detail in FIG. 2, the intake portion 13 has one rectangular intake port 16 provided to be opened in the ceiling portion 4a, and one end of a hinge or the like at the rear edge of the intake port 16. It consists of an intake duct 18 that is rotatably connected via a support shaft 17. The intake duct 18 includes a rectangular top plate portion 18a that is substantially the same size as the intake port 16, and a pair of left and right side plate portions 18b that have a substantially triangular shape that hangs at substantially right angles from the left and right edges of the top plate portion 18a. (Shown only on the right side), and as shown by a solid line in the figure, leaving only one side of the side plate portion 18b and projecting outside (above the ceiling portion 4a) to guide the traveling wind W to the intake port 16, As shown by the phantom line in the figure, it is housed in the intake port 16 so that the top plate portion 18a can be switched to a closed position where the intake port 16 is closed substantially flush with the ceiling portion 4a of the engine compartment 4. . The intake duct 18 is fixed by a fixing tool such as a fixing pin and a gas spring at the open position and the closed position, respectively.

  Therefore, in the first embodiment, since the engine chamber 4 having substantially the same height and width as the cab 3 is provided behind the cab 3 of the upper swing body 1, the overall width and height of the work machine are increased. Therefore, the engine room 4 can be made as large as possible, and a noise insulation structure such as fixing the sound absorbing materials 11 and 12 to the entire engine room 4 in the same manner as the inner surface of the intake room 5 is adopted. Can be easily reduced. Further, since a relatively large intake chamber 5 is secured on the front side of the engine chamber 4, that is, on the cab 3 side, noise accompanying intake air can be reduced and propagation of engine noise or the like to the cab 3 side can be suppressed. From this point, noise can be further reduced.

  In addition, since an air intake portion 13 that guides outside air to the air intake chamber 5 is provided in the ceiling portion 4a corresponding to the air intake chamber 5 of the engine chamber 4, the traveling wind is taken as outside air through the air intake portion 13 during traveling of the work machine. It can be easily guided to the intake chamber 5 and can contribute to increasing the cooling efficiency of the heat exchanger 6 on the downstream side of the intake chamber 5.

  In particular, in the case of the present embodiment, the intake portion 13 includes an intake port 16 provided in the ceiling portion 4 a and an intake port having one end rotatably connected to the rear edge portion of the intake port 16 via a support shaft 17. Further, the intake duct 18 can be switched between an open position for leading the running wind W to the intake port 16 and a closed position that is housed in the intake port 16 and closes the intake port 16. Therefore, when the intake duct 18 is switched to the open position when the work machine is traveling, the traveling air W can be efficiently guided into the intake chamber 5 through the intake port 16 of the ceiling portion 4a. The cooling efficiency of the heat exchanger 6 can be further increased. Further, when encountering a place with a height restriction, the overall height can be reduced by switching the intake duct 18 to the closed position, so that there is no hindrance to traffic. In addition, when the intake duct 18 is switched to the closed position, the intake port 16 of the ceiling portion 4a is closed by the intake duct 18, so that foreign matters such as rainwater and dust can be prevented from entering the intake chamber 5.

(Second Embodiment)
FIG. 3 shows the structure of the upper-part turning body of the wheel type work machine according to the second embodiment of the present invention. In the case of the second embodiment, the basic structure of the upper swing body 1 is the same as that of the first embodiment, and the same members are denoted by the same reference numerals and the description thereof is omitted.

  The difference from the first embodiment is the structure of the intake portion 20 for guiding outside air from the ceiling portion 4 a corresponding to the intake chamber 5 of the engine chamber 4 to the intake chamber 5. That is, as shown in detail in FIGS. 4 and 5, the intake portion 20 includes a plurality of horizontally-long rectangular intake ports 21, 21,... Provided in the ceiling portion 4 a so as to open in two rows. The box-shaped intake duct 22 guides the traveling wind W to the intake ports 21, 21,... While covering the upper sides of these intake ports 21, 21,. The intake duct 22 includes a rectangular top plate portion 22a inclined downward and downward, a pair of trapezoidal left and right side plate portions 22b and 22b hanging substantially at right angles from left and right edges of the top plate portion 22a, and a top plate A rectangular back plate portion 22c that hangs at a substantially right angle from the rear edge of the portion 22a, and a series of flange portions formed by bending the respective lower edge portions of the side plate portions 22b and 22b and the back plate portion 22c outward at a substantially right angle. 22d, and the flange portion 22d is removably attached to the ceiling portion 4a by being fixed by a plurality of bolts 23, 23,. The air inlet 21 is not limited to a horizontally long rectangular shape as shown in the drawing, and may be formed by providing a slit in a plate material constituting the ceiling portion 4a to form a step.

  Therefore, in the second embodiment, the air intake portion 20 covers a plurality of air inlets 21, 21,... Provided in the ceiling portion 4a and the air inlets 21, 21,. .., And a box-shaped intake duct 22 that guides the traveling wind W to the intake ports 21, 21,... And is detachably attached to the ceiling portion 4 a. The traveling wind W can be efficiently guided into the intake chamber 5 through the intake ports 21, 21,... Of the ceiling portion 4a by the intake duct 22 attached to 4a, and the cooling efficiency of the heat exchanger 6 can be increased. In addition, when encountering a place with a height restriction, the overall height can be reduced by removing the intake duct 22, so that there is no hindrance to traffic. In addition, since the intake duct 22 is attached to the ceiling portion 4a so as to cover the upper side of the intake ports 21, 21,..., Foreign matter such as rainwater and dust can be prevented from entering the intake chamber 5. .

  In the second embodiment, the basic structure of the upper swing body 1 is the same as that of the first embodiment, that is, the cab 3 and the height and the rear of the cab 3 of the upper swing body 1 are the same. An engine chamber 4 having substantially the same width is provided, and an intake chamber 5, a heat exchanger 6, a cooling fan 7, an engine 8 and a hydraulic pump 9 are arranged in series in this engine chamber 4 from the front side. Needless to say, it is possible to reduce noise as in the case of the first embodiment. Further, in the second embodiment, compared to the case of the first embodiment, it takes time to remove the intake duct 22, but the manufacturing cost can be reduced.

(Third embodiment)
FIG. 6 shows the structure of the upper-part turning body of the wheel type work machine according to the third embodiment of the present invention. In the case of the third embodiment, a plurality of horizontally-long rectangular intake ports 26, 26,... Are provided below the outer side wall portion 4b corresponding to the intake chamber 5 of the engine chamber 4 separately from the intake port 16 of the ceiling portion 4a. The outside air A is also introduced into the intake chamber 5 from the intake port 26. Other configurations of the upper swing body 1 are the same as those in the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  Accordingly, in the third embodiment, a plurality of intake ports 26, 26,... Provided separately from the intake port 16 of the ceiling portion 4a at the lower portion of the outer side wall portion 4b corresponding to the intake chamber 5 of the engine chamber 4 are also provided. Since the outside air is introduced into the intake chamber 5, the amount of intake air into the intake chamber 5 even when the intake duct 18 is housed in the intake port 16 and is switched to the closed position where the intake port 16 is closed. As a result, the cooling air volume of the heat exchanger 6 can be sufficiently secured.

  In the third embodiment, the basic structure of the upper swing body 1 is the same as that in the first embodiment, so that noise can be reduced as in the case of the first embodiment. Of course, there are effects such as being able to.

(Fourth embodiment)
FIG. 7 shows the structure of the upper-part turning body of the wheel type work machine according to the fourth embodiment of the present invention. In the case of the fourth embodiment, the basic structure of the upper swing body 1 is the same as in the case of the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  The difference from the first embodiment is the structure of the intake portion 30 for guiding outside air from the ceiling portion 4 a corresponding to the intake chamber 5 of the engine chamber 4 to the intake chamber 5. That is, as shown in an enlarged detail in FIG. 8, the intake portion 30 has a single rectangular intake port 31 provided in the ceiling portion 4 a so as to be open, and a central portion between the left and right sides of the intake port 31. The portion includes an intake duct 34 that is rotatably supported via a support shaft 32 and a bracket 33. The intake duct 34 has a rectangular top plate portion 34a having a width substantially the same as that of the intake port 31 and a length in the front-rear direction slightly larger than that of the intake port 31, and both left and right edges of the top plate portion 24a. A pair of left and right side plates 34b (only the right side is shown) that hangs substantially at right angles, and the rear edge of the top plate portion 34a closes close to the air inlet 31 as shown by the solid line in the figure, and the top plate portion A first position where the front edge of 34a opens away from the air inlet 31; and the front edge of the top plate portion 34a closes close to the air inlet 31 and the rear edge of the top plate portion 34a as shown in phantom lines in the figure Is switched to a second position that opens away from the intake port 31. Although not shown, this switching can be performed from within the cab 3 using a known control cable or using an actuator such as a hydraulic or pneumatic cylinder or an electric motor.

  Therefore, in the fourth embodiment, when the intake duct 34 of the intake portion 30 is switched to the first position and the opening side thereof is directed forward during traveling of the work machine, the traveling wind W is generated by the intake duct 34. Since the air is efficiently guided into the intake chamber 5 through the intake port 31 of the ceiling portion 4a, a sufficient amount of intake air to the intake chamber 5 and thus a cooling air amount of the heat exchanger 6 can be secured, and the cooling efficiency can be increased. it can.

  On the other hand, when the intake duct 34 of the intake section 30 is switched to the second position and the opening side thereof is directed rearward when the work machine is working, noise in the engine chamber 4 such as engine noise is caused by the intake port 31 of the intake section 30. In addition, since it is diffused to the rear of the work machine through the intake duct 34, the noise propagating in the cab 3 can be reduced accordingly.

(Fifth embodiment)
9 and 10 show the structure of the upper-part turning body of the wheel type work machine according to the fifth embodiment of the present invention. In the case of the fifth embodiment, the basic structure of the upper swing body 1 is the same as in the case of the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  The difference from the first embodiment is the structure of the intake portion 40 for guiding outside air from the ceiling portion 4 a corresponding to the intake chamber 5 of the engine chamber 4 to the intake chamber 5. That is, as shown in enlarged detail in FIG. 11, the intake portion 40 includes a plurality of horizontally-long rectangular intake ports 41, 41,... Provided in the ceiling portion 4a so as to be opened in two rows. It comprises an intake duct 42 that guides the traveling wind W to the intake ports 41, 41,... While covering the upper portions of the intake ports 41, 41,. The intake duct 42 includes a rectangular top plate portion 42a that is inclined in the front-rear direction, and a pair of right and left side plate portions 42b that are substantially right-angled from the left and right edges of the top plate portion 42a (shown on the right side only). And a pair of left and right flange portions 42c (only the right side is shown) formed by bending the lower edge portion of each side plate portion 42b outward at substantially right angles, and each flange portion 42c is attached to the ceiling portion 4a with a plurality of bolts 43. , 43,... (See FIG. 9 and FIG. 10), it is removably attached. Further, the fastening location of each bolt 43 is set to a symmetrical positional relationship in the front-rear direction of the intake duct 42, and the direction of the opening side of the intake duct 42 can be changed to two directions, forward and backward.

  Accordingly, in the fifth embodiment, when the work machine is traveling, when the intake duct 42 of the intake portion 40 is attached to the ceiling portion 4a with the opening side facing forward as shown in FIG. Since the traveling wind W is efficiently guided into the intake chamber 5 through the intake port 41 of the ceiling portion 4a by 42, the intake air amount to the intake chamber 5 and thus the cooling air amount of the heat exchanger 6 can be sufficiently secured. Cooling efficiency can be increased.

  On the other hand, when the intake duct 42 of the intake portion 40 is attached to the ceiling portion 4a with the opening side facing rearward as shown in FIG. Since it is diffused to the rear of the work machine through the intake port 41 and the intake duct 42 of the portion 40, the noise propagating in the cab 3 can be reduced accordingly.

(Sixth embodiment)
FIG. 12 shows the structure of the upper-part turning body of the wheel type work machine according to the sixth embodiment of the present invention. In the case of this sixth embodiment, a sheet-like or thin plate-like sound absorbing material 46 is fixed to the inner surface of the intake duct 18 of the intake portion 13 provided in the ceiling portion 4a corresponding to the intake chamber 5 of the engine chamber 4. . Other configurations of the upper swing body 1 are the same as those in the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  Therefore, in the sixth embodiment, since the sound absorbing material 46 is fixed to the inner surface of the intake duct 18, the noise in the intake chamber 5 is diffused to the outside from the air inlet 16 of the ceiling portion 4a by the sound absorbing material 46. As a result, the noise can be further reduced as compared with the case of the first embodiment.

  In addition, this invention is not limited to the said 1st thru | or 6th embodiment, Various other forms are included. For example, in each of the above embodiments, the sound absorbing materials 11 and 12 are provided on the front wall surface and the floor surface, respectively, of the inner surface of the intake chamber 5, but the present invention is arranged on the left and right sides to enhance the sound absorption effect of the intake chamber 5. A similar sound absorbing material may be provided on the wall surface.

  Further, in the first embodiment, when the intake portion 13 is provided in the ceiling portion 4a corresponding to the intake chamber 5 of the engine chamber 4, the intake port 16 of the intake portion 13 is formed in a rectangular shape. Of course, the shape of the intake port 16 may be circular or trapezoidal.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic structure of the upper revolving body of the wheel type work machine which concerns on the 1st Embodiment of this invention is shown, (a) is a top view, (b) is the side view which cut | disconnected a part (engine room). FIG. 2 is an enlarged view of the vicinity of an intake portion in FIG. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment. FIG. 4 is an enlarged view of the vicinity of the intake portion of FIG. FIG. 4 is an enlarged view of the vicinity of the intake portion of FIG. FIG. 6 is a view corresponding to FIG. 1 showing a third embodiment. FIG. 10 is a view corresponding to FIG. 1 and showing a fourth embodiment. FIG. 8 is an enlarged view of the vicinity of the intake portion of FIG. FIG. 10 is a view corresponding to FIG. 1 showing a fifth embodiment. Similarly, it is equivalent to FIG. FIG. 10 is an enlarged view of the vicinity of the intake portion of FIG. FIG. 10 is a view corresponding to FIG. 1 showing a sixth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper revolving body 3 Cab 4 Engine room 4a Ceiling part 5 Intake room 6 Heat exchanger 7 Cooling fan 8 Engine 9 Hydraulic pump 11, 12, 46 Sound-absorbing material 13, 20, 30, 40 Intake part 16, 21, 26, 31 , 41 Air intake port 17, 32 Support shaft 18, 22, 34, 42 Air intake duct

Claims (8)

An upper swinging body is mounted on the lower traveling body so as to be capable of swiveling. A telescopic boom is disposed at the center in the width direction of the upper swinging body so that it can be raised and lowered. In the wheel type work machine provided with
An engine chamber having substantially the same height and width as the cab is provided behind the cab, and an intake chamber, a heat exchanger, a cooling fan, an engine, and a hydraulic pump are arranged in series in this engine chamber in order from the front side. A wheel type work machine characterized in that an air intake portion for guiding outside air to the air intake chamber is provided in a ceiling portion corresponding to the air intake chamber of the engine compartment.   The intake section includes one intake opening provided in the ceiling and an intake duct having one end rotatably connected to an edge of the intake opening via a support shaft. The wheel type work machine according to claim 1, wherein the wheel type work machine is provided so as to be switched between an open position that projects outwardly and guides the traveling wind to the intake port and a closed position that is housed in the intake port and closes the intake port.   The intake section includes an intake opening having a rectangular opening provided in the ceiling, and an intake section in which a central portion is rotatably supported via a support shaft between two opposite sides of the intake opening. The intake duct has a first position where one end side closes close to the intake port and the other end side opens away from the intake port, and one end side opens away from the intake port and the other end side opens The wheel type work machine according to claim 1, wherein the wheel type work machine is provided so as to be switched to a second position that closes close to the intake port.   The air intake section is composed of an air intake opening provided in the ceiling and an air intake duct that covers the top of the air intake and guides the wind to the air intake. The air intake duct can be removed from the ceiling. The wheel type work machine according to claim 1, which is attached.   The wheel type work machine according to claim 4, wherein the intake duct is provided so that its direction can be changed in two or more directions.   The wheel type work machine according to any one of claims 2 to 5, wherein outside air is introduced into the intake chamber from an intake port provided separately from an intake portion of a ceiling portion.   The wheel type work machine according to any one of claims 1 to 6, wherein a sound absorbing material is provided on an inner surface of the intake chamber. The wheel type work machine according to any one of claims 2 to 5, wherein a sound absorbing material is provided on an inner surface of the intake duct.