JP2006169849A - Power device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power device capable of preventing the incursion of rain water, earth and sand and dust or the like into an engine room from an exhausting opening section by a simple structure. <P>SOLUTION: A cooling package 34 equipped with a cooling fan 33 is installed in a space surrounded by an upper shell structural object 31 such as an engine hood and a side door or the like and a lower shell structural object 32 such as a bottom plate of an engine room and a bottom guard or the like, and the engine room 37 having an engine 36 dividedly formed in a downstream side from the cooling package 34. Exhausting opening sections 42 and 43 exhausting a cooling wind supplied to the inside of the engine room 37 through the cooling package 34 by the cooling fan 33 are respectively provided to the shell structural objects 31 and 32 facing to the engine room 37, these exhausting opening sections 42 and 43 are shielded and, at the same time, shielding plates 51 and 53 opened by exhaust pressure from the engine room 37 are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power unit having cooling means.

  FIG. 4 shows a part of a conventional power unit mounted on an upper swing body of a hydraulic excavator. A cooling package 3 having a cooling fan 2 is installed inside the outer shell structure 1, and the cooling package 3 A radiator room 4 is further formed on the upstream side, and an engine room 6 in which the engine 5 is installed on the downstream side. An air supply opening 7 is opened on the upper side of the radiator room 4. Further, exhaust openings 8 and 9 for exhausting the cooling air supplied to the engine room 6 by the cooling fan 2 through the cooling package 3 to the outside are opened. A pump chamber 12 is formed adjacent to the engine room 6 via a fire wall plate 11, and a hydraulic pump 13 driven by the engine 5 is installed in the pump chamber 12. Exhaust openings 14 and 15 are also provided in the upper and lower portions of the pump chamber 12.

  When the cooling fan 2 is started, the air flow on the upstream side (air supply side) of the cooling fan 2 is taken in from the air supply opening 7 above or on the side of the radiator room 4, and the cooling package Cooling the heat exchanger 3 a such as a radiator or an oil cooler 3 forms hot air, which is sucked into the cooling fan 2.

  Further, the flow of air converted into hot air on the downstream side (exhaust side) of the cooling fan 2 is exhausted from the cooling fan 2, passes through the engine room 6, and is provided at the upper and lower portions of the engine room 6. It is discharged to the outside through the exhaust openings 14 and 15 provided in the upper part or lower part of the parts 8 and 9 or the pump chamber 12.

On the other hand, a louver mechanism that is driven to open and close by an opening / closing actuator is provided at the air supply opening provided at the upper part of the radiator room and the exhaust opening provided at the upper part of the engine room. When the oil temperature is low, the controller detects the state with a temperature sensor and the drive signal from the controller to the opening / closing actuator closes the louver mechanism and performs warm-up operation in a short time, while cooling the construction machine to reduce engine noise. There is an apparatus (for example, refer to Patent Document 1).
Microfilm of Japanese Utility Model Application No. 1-145234 (Japanese Utility Model Application No. 3-83324) (Specification, page 8-10, Fig. 1-4)

  In the conventional example shown in FIG. 4, rainwater, earth and sand, dust and the like enter the engine room 6 from the exhaust openings 8 and 9 provided in the upper part or the lower part of the engine room 6. Component damage may occur.

  On the other hand, if the opening areas of these exhaust openings 8 and 9 are extremely narrowed, the pressure loss increases when passing through them, and there is a possibility that the original airframe performance cannot be exhibited.

  In addition, it is difficult in terms of design to change or eliminate the positions and forms of the exhaust openings 8 and 9, leading to an increase in cost and a decrease in exhaust efficiency.

  Furthermore, in the cooling device described in Patent Document 1, the opening and closing actuator is driven by a controller that detects the radiator water temperature and the hydraulic oil temperature with a temperature sensor, and the louver mechanism is controlled to open and close, so the mechanism and the control system are complicated. There is a problem.

  The present invention has been made in view of the above points, and an object thereof is to provide a power unit that can prevent rainwater, earth and sand, dust, and the like from entering an engine room from an exhaust opening with a simple structure. To do.

  The invention described in claim 1 includes an outer shell structure, cooling means installed in the outer shell structure and provided with a cooling fan, and an engine room partitioned and formed downstream of the cooling means. And an exhaust opening that opens to the outer shell structure facing the engine room and exhausts the cooling air supplied to the engine room by a cooling fan through cooling means to the outside, and shields the exhaust opening and from the engine room. A power device having a shielding plate that opens by exhaust pressure, and a shielding plate that shields the exhaust opening and opens by exhaust pressure from the engine room. When the cooling fan stops, it faces the engine room By shielding the exhaust opening of the outer shell structure with this shielding plate, Prevents rainwater, earth and sand, dust, etc. from entering the system, and when the cooling fan is in operation, the shielding plate is opened at an opening that balances with the exhaust pressure from the engine room. This prevents rainwater, earth and sand, dust and the like from entering the engine room from the exhaust opening.

  According to a second aspect of the present invention, there is provided the power unit according to the first aspect, wherein a pump chamber formed adjacent to the engine room via a fire wall plate and an outer shell structure facing the pump chamber is opened by a cooling fan. An exhaust opening that exhausts the cooling air supplied to the pump chamber through the engine room to the outside, and a shielding plate that shields the exhaust opening and opens by the exhaust pressure from the pump chamber; and Since the shielding plate that shields the exhaust opening facing the pump chamber and opens by the exhaust pressure from the pump chamber is provided, when the cooling fan is stopped, the exhaust opening facing the pump chamber is shielded by this shielding plate, Prevents rainwater, earth and sand, and dust from entering the pump chamber through the exhaust opening. Since opening the shielding plate to the scan to opening, to prevent the risk of rain water from the exhaust opening in the pump chamber against the exhaust pressure, sediment, dust from entering.

  According to a third aspect of the present invention, the exhaust opening and the shielding plate in the power unit according to the first or second aspect are provided on the upper part of the outer shell structure, and rain water, soaring earth and sand and soaring dust Or the like is prevented by a shielding plate provided on the upper part of the engine structure or the pump chamber from the exhaust opening provided on the upper part of the outer shell structure.

  According to a fourth aspect of the present invention, the exhaust opening and the shielding plate in the power unit according to the first or second aspect are provided at a lower portion of the outer shell structure, and rainwater splashed from the ground, The shield plate provided at the lower part prevents the rolled up earth and sand from entering the engine room or the pump room from the exhaust opening provided at the lower part of the outer shell structure.

  According to the first aspect of the present invention, since the shielding plate that shields the exhaust opening and is opened by the exhaust pressure from the engine room is provided, the exhaust opening of the outer shell structure that faces the engine room when the cooling fan is stopped. By shielding this part with this shielding plate, it is possible to prevent rainwater, earth and sand, dust, etc. from entering the engine room from the exhaust opening, and when the cooling fan is operating, the exhaust pressure from the engine room Since the shielding plate is opened at a balanced opening, it is possible to prevent rainwater, earth and sand, dust and the like from entering the engine room from the exhaust opening against the exhaust pressure. Moreover, since the shielding plate is opened by the exhaust pressure from the engine room, a sensor and an actuator are not required, and the mechanism and the control system can be prevented from becoming complicated.

  According to the second aspect of the present invention, since the exhaust opening facing the pump chamber is shielded and opened by the exhaust pressure from the pump chamber, the exhaust opening facing the pump chamber is stopped when the cooling fan is stopped. By shielding this with the shielding plate, it is possible to prevent the possibility of rainwater, earth and sand, dust, etc. entering the pump chamber from the exhaust opening, and when the cooling fan is in operation, the opening is balanced with the exhaust pressure from the pump chamber. Since the shielding plate is opened every time, it is possible to prevent the possibility of rain water, earth and sand, dust and the like entering the pump chamber from the exhaust opening against the exhaust pressure. In addition, since the shielding plate is opened by the exhaust pressure from the pump chamber, a sensor and an actuator are not required, and the mechanism and the control system can be prevented from becoming complicated.

  According to the third aspect of the present invention, there is a risk that rainwater that pours down, soaring earth and sand, dust, etc. may enter the engine room or the pump chamber from the exhaust opening provided at the upper part of the outer shell structure. This can be prevented by the shielding plate provided.

  According to the invention described in claim 4, rain water splashed from the ground, rolled up earth and sand, dust and the like enter the engine room or the pump chamber from the exhaust opening provided at the lower part of the outer shell structure. The fear can be prevented by a shielding plate provided in the lower part thereof.

  The present invention will be described below with reference to one embodiment shown in FIGS.

  FIG. 3 shows a hydraulic excavator as a work machine equipped with the power unit according to the present invention. An upper swing body 22 is turnably provided on a lower traveling body 21 via a swing bearing portion. The cab 23, working device 24, tool box 25, fuel tank 26, hydraulic oil tank 27, control valve 28, etc. are mounted on the front, and the power unit 29 is mounted on the rear side of these, and further on the rear end. A counterweight 30 is mounted.

  As shown in FIG. 1, the power unit 29 is a space surrounded by an upper shell structure 31 such as an engine hood and a side door, and a lower shell structure 32 such as an engine room bottom plate and a bottom guard. Inside, a cooling package 34 as a cooling means provided with a cooling fan 33 is installed, and a radiator room 35 is formed upstream of the cooling package 34, and an engine room 37 in which the engine 36 is installed downstream is partitioned. Has been.

  An air supply opening 41 is opened in an outer shell structure 31 such as an engine hood and side door that faces the radiator room 35, and a cooling fan 33 is provided in an upper outer shell structure 31 such as the engine hood that faces the engine room 37. The upper exhaust opening 42 for exhausting the cooling air supplied to the engine room 37 through the cooling package 34 to the outside is opened, and the lower outer shell structure such as the engine room bottom plate and the bottom guard facing the engine room 37 is opened. A lower exhaust opening 43 for exhausting the cooling air supplied to the engine room 37 through the cooling package 34 by the cooling fan 33 is opened to the outside.

  A pump chamber 45 is formed adjacent to the engine room 37 via a fire wall plate 44, and a hydraulic pump 46 driven by the engine 36 is installed in the pump chamber 45. An exhaust opening 47 for exhausting the cooling air supplied to the pump chamber 45 through the engine room 37 by the cooling fan 33 is opened on the side surface of the upper outer shell structure 31 facing the pump chamber 45, The lower outer shell structure 32 facing the pump chamber 45 is provided with an exhaust opening 48 for exhausting the cooling air supplied to the pump chamber 45 through the engine room 37 by the cooling fan 33 to the outside. In FIGS. 1 and 3, reference numeral 49 denotes an exhaust muffler of the engine 36.

  A shield plate 51 that shields the upper exhaust opening 42 and opens by the exhaust pressure from the engine room 37 to the outer shell structure 31 such as an engine hood located at the upper part of the engine room 37 is provided from the upper exhaust opening 42. On the upper side, the hinge 52 is provided so as to be openable and closable.

  In addition, a shield plate 53 that shields the lower exhaust opening 43 and opens by exhaust pressure from the engine room 37 to the outer shell structure 32 such as an engine room bottom plate and a bottom guard located at the lower part of the engine room 37, The exhaust opening 43 is provided below the exhaust opening 43 so that the hinge 54 can be opened and closed. Further, a spring 55 is provided between the lower outer shell structure 32 and the lower shielding plate 53 as an urging means for urging the shielding plate 53 in the direction to close against its own weight.

  Similarly, a shielding plate 61 that shields the upper exhaust opening 47 and opens by the exhaust pressure from the pump chamber 45 to the outer shell structure 31 such as an engine hood located at the upper part of the pump chamber 45 has an upper exhaust opening. On the upper side of the portion 47, the hinge 62 is provided so as to be openable and closable.

  In addition, a shield plate 63 that shields the lower exhaust opening 48 and opens by the exhaust pressure from the pump chamber 45 to the outer shell structure 32 such as the engine room bottom plate and the bottom guard located in the lower portion of the pump chamber 45 is The exhaust opening 48 is provided so as to be openable and closable around the hinge 64. Furthermore, a spring 65 is provided between the fire wall plate 44 and the lower shielding plate 63 as a biasing means that biases the shielding plate 63 in a direction to close against the dead weight.

  Next, the function and effect of this embodiment will be described.

  When the engine 36 and the cooling fan 33 are stopped, the shielding plate 51 closes the exhaust opening 42 by its own weight, and the shielding plate 53 closes the exhaust opening 43 by the biasing force of the spring 55.

  On the other hand, when the engine 36 is started and the cooling fan 33 is driven, the air flow on the upstream side (supply side) of the cooling fan 33 is above or on the side of the radiator room 35 by the suction force of the cooling fan 33. When the outside air sucked into the radiator room 35 from the other air supply opening 41 passes through the cooling package 34, the heat exchanger 34a such as a radiator and an oil cooler constituting the cooling package 34 is cooled. In addition to cooling the engine coolant and the hydraulic fluid of the hydraulic circuit, the engine itself becomes hot air and sucked into the cooling fan 33.

  Further, the flow of air discharged as hot air downstream of the cooling fan 33 (exhaust side) passes through the engine room 37, and is provided with exhaust openings 42 provided in the upper and lower parts of the engine room 37. 43 is discharged to the outside.

  At this time, part of the outer shell structures 31 and 32 such as the engine hood and the bottom guard are movable shielding plates 51 and 53, and these shielding plates 51 and 53 correspond to the exhaust pressure from the engine room 37. Since the upper shielding plate 51 is opened and closed, the upper shielding plate 51 opens against its own weight due to the pushing-up force caused by the exhaust pressure, and the lower shielding plate 53 is applied to the spring 55 by the pushing force caused by the exhaust pressure. Open against.

  Therefore, when the exhaust pressure rises due to an increase in the rotational speed of the cooling fan 33, the opening degree of these shielding plates 51 and 53 expands against its own weight or the spring 55.

  Similarly, when the engine 36 and the cooling fan 33 are stopped, the upper exhaust opening 47 facing the pump chamber 45 is closed by the upper shielding plate 61 by its own weight, and the lower exhaust opening facing the pump chamber 45 is closed. The lower shielding plate 63 is closed by the urging force of the spring 65.

  On the other hand, when the engine 36 is started and the cooling fan 33 is driven, part of the cooling air that has passed through the engine room 37 is from the exhaust openings 47 and 48 provided in the upper and lower parts of the pump chamber 45. It is discharged outside.

  At this time, since the shielding plates 61 and 63 are configured to be opened and closed according to the exhaust pressure from the pump chamber 45, the upper shielding plate 61 resists its own weight due to the pushing-up force due to the exhaust pressure from the pump chamber 45. The lower shielding plate 63 is opened against the spring 65 by the pressing force due to the exhaust pressure from the pump chamber 45.

  In this way, the shielding plate that shields the exhaust openings 42, 43, 47, 48 of the outer shell structures 31, 32 facing the engine room 37 and the pump chamber 45 and opens by the exhaust pressure from the engine room 37 and the pump chamber 45 Since 51, 53, 61, 63 are provided, when the cooling fan 33 is stopped, these shielding plates 51, 53, 61, 63 automatically shield the exhaust openings 42, 43, 47, 48. It is possible to prevent rainwater, earth and sand, dust and the like from entering the engine room 37 and the pump chamber 45 from the exhaust openings 42, 43, 47, 48. Also, when the cooling fan 33 is in operation, Since the shielding plates 51, 53, 61, 63 are opened at an opening that balances with the exhaust pressure from the pump chamber 45, the exhaust plates 42, 43, 47, 48 can resist the exhaust pressure from the exhaust openings 42, 43, 47, 48 and into the engine room 37. Prevents rainwater, earth and sand, and dust from entering the pump chamber 45

  That is, when the exhaust pressure is high, the opening degree of the shielding plates 51, 53, 61, and 63 is also increased, but the force to prevent the intrusion of rainwater, earth and sand, dust, etc. is also increased, which is effective in preventing these penetrations. .

  Then, the rainwater that falls, the rising soil and dust, etc., may enter the engine room 37 and the pump chamber 45 from the exhaust openings 42 and 47 provided in the upper part of the engine room 37 and the pump chamber 45. This can be prevented by the shielding plates 51 and 61 provided in FIG. Also, rain water splashed from the ground, rolled up earth and sand, dust, etc. enter the engine room 37 and the pump chamber 45 from the exhaust openings 43 and 48 provided in the lower part of the engine room 37 and the pump chamber 45. The possibility of intrusion can be prevented by the shielding plates 53 and 63 provided in the lower part thereof.

  Moreover, these shielding plates 51, 53, 61, 63 open the exhaust openings 42, 43, 47, 48 by the exhaust pressure from the engine room 37 and the pump chamber 45, so that no sensors or actuators are required. Since the invasion of rainwater, earth and sand, dust and the like can be prevented with a simple structure, the mechanism and the control system can be prevented from becoming complicated.

  As described above, when the engine is stopped, the shielding plates 51, 53, 61, 63 are closed, but as the engine 36 is started and the exhaust pressure from the engine room 37 and the pump chamber 45 increases, the shielding plates 51, 53, 61, and 63 are open, but exhaust air is blown out at the exhaust openings 42, 43, 47, and 48, so rainwater, earth and sand, dust, etc. do not enter inside the fuselage. Internal components such as the engine 36, the exhaust muffler 49, and the hydraulic pump 46 are not damaged.

  Further, these shielding plates 51, 53, 61, 63 also function as sound insulation plates, and have an action of blocking engine sounds and cooling fan sounds that the exhaust openings 42, 43, 47, 48 leak to the outside. Ambient noise can be reduced.

  Further, since these shielding plates 51, 53, 61, 63 are movable, the exhaust openings 42, 43, 47, 48 are not fixedly squeezed like a certain exhaust hole. There is no increase in pressure loss when passing through the hole, and smoother and more efficient exhaust can be performed.

  Finally, the hinges 52, 54, 62, 64 are not indispensable. For example, when a flexible member 66 such as rubber or resin as shown in FIG. Even if the base end portion of the flexible member 66 is fixed to the outer shell structure 31 with a bolt 67, a nut 68, or the like, the flexible member 66 can be opened and closed by deformation of the flexible member 66 itself.

  Exhaust openings 42 and 47 and shielding plates 51 and 61 provided in the upper portions of the engine room 37 and the pump chamber 45, and exhaust openings 43 and 48 provided in the lower portions of the engine room 37 and the pump chamber 45, and a shield. Only one of the plates 53 and 63 may be used.

It is sectional drawing which shows one Embodiment of the power plant which concerns on this invention. It is sectional drawing which shows the modification of the shielding plate in a power apparatus same as the above. It is a perspective view of the working machine carrying a power unit same as the above. It is sectional drawing which shows the conventional power unit.

Explanation of symbols

31, 32 Outer shell structure
33 Cooling fan
34 Cooling package as a cooling means
36 engine
37 Engine room
42, 43 Exhaust opening
44 Fire wall board
45 Pump room
47, 48 Exhaust opening
51, 53 Shield plate
61, 63 Shield plate

Claims (4)

An outer shell structure,
Cooling means installed in the outer shell structure and provided with a cooling fan;
An engine room in which an engine is installed and formed downstream of the cooling means;
An exhaust opening that opens to the outer shell structure facing the engine room and exhausts the cooling air supplied to the engine room by a cooling fan through cooling means;
A power unit comprising: a shielding plate that shields the exhaust opening and opens by exhaust pressure from the engine room. A pump chamber formed through a fire wall plate adjacent to the engine room;
An exhaust opening for exhausting the cooling air supplied to the pump chamber through the engine room by a cooling fan and opened to the outer shell structure facing the pump chamber;
The power unit according to claim 1, further comprising a shielding plate that shields the exhaust opening and opens by exhaust pressure from the pump chamber. The power unit according to claim 1, wherein the exhaust opening and the shielding plate are provided in an upper part of the outer shell structure. The power unit according to claim 1 or 2, wherein the exhaust opening and the shielding plate are provided in a lower part of the outer shell structure.

Images