JP4462573B2 - Cooling mechanism for work vehicle equipped with vertical engine - Google Patents

Description

  The present invention relates to a configuration for cooling a vertical engine mounted on a riding work machine.

Conventionally, a traveling vehicle equipped with a vertical engine is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-34929. That is, as shown in FIG. 9, a vertical engine 8 ′ is mounted in front of the driver's seat 7 ′ of the traveling vehicle body (or rearward when the seat is opposite), and the output shaft 8′a is connected to the pair of left and right. Projecting downward from between the main frames 2 ', a travel device drive pulley 12' and a work machine output pulley are fixedly provided. The driving force is transmitted from the traveling device driving pulley to the traveling device via a belt. Further, a work machine output pulley is fixed to the output shaft so that a work machine such as a mower 17 ′ or a tillage device can be driven. Further, a cooling fan 21 'is pivotally supported above the engine, and a radiator 22' supported integrally with the engine is disposed above the engine. The outside air is sucked from the bonnet 9 'located immediately above the radiator, and the radiator and the engine. Was to be cooled. In addition, radiator cooling water was circulated between the engine.
JP 59-34929 A JP-A-6-316224

  In the configuration in which outside air is sucked from the bonnet 9 ′ above the conventional vertical engine 8 ′, it is not necessary to provide a cooling air introduction path such as the radiator 22 ′ at the front of the bonnet. Although a battery, a fuel tank, etc. can be arranged and used effectively in the front space, the cooling air inlet 9a 'provided in the bonnet is in the vicinity of the driver's seat 7', and engine noise is generated in the driver's seat. It was transmitted to the seated operator and the working environment was significantly deteriorated. In addition, when the bonnet is downsized, the arrangement of the air cleaner and the arrangement of the intake pipe of the air cleaner are restricted, making it difficult to take in air with low dust and dust and low temperature. Further, the exhaust air that has cooled the engine or the like is discharged downward as it is. For example, when the mower 17 'is arranged on the abdomen of the vehicle body, there is a problem that the cut grass is diffused and the engine sound is also generated. Leakage noise was generated from below. This problem is solved.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
In claim 1, in a work vehicle in which a vertical engine (8) is mounted and the engine (8) is covered with a bonnet (9), the engine (8) is mounted and fixed on a mounting plate (20). Then, the space between the periphery of the mounting plate (20) and the bonnet (9) covering the engine (8) is sealed, and the mounting plate (20) is used as a part of the cooling duct. 20), an HST type continuously variable transmission (14) is arranged below the HST type continuously variable transmission (14), and an exhaust air inlet (20a) is opened in the mounting plate (20) above the HST type continuously variable transmission (14). A shroud (43) is formed in the exhaust air introduction port (20a), and the cooling fan (42) fixed on the input shaft (14b) of the HST continuously variable transmission (14) by the shroud (43). It covers the outside.
According to a second aspect of the present invention, in the cooling mechanism for a vertical engine-equipped work vehicle according to the first aspect, a cooling exhaust port (46) is provided on the rear side of the mounting plate (20), and an end of the cooling exhaust port (46) is provided. A silencer (24) is arranged in the section, and an exhaust communication pipe (40) communicating between the silencer (24) and the engine (8) is fixed to the mounting plate (20).

Since the present invention is configured as described above, the following effects can be obtained.
A working vehicle having a vertical engine (8) mounted thereon and covered with a bonnet (9), wherein the engine (8) is mounted on a mounting plate (20). It fixes and seals between the circumference | surroundings of this mounting plate (20) and the bonnet (9) which covers an engine (8), This mounting plate (20) is made into a part of cooling duct, The mounting plate mentioned above An HST type continuously variable transmission (14) is disposed below (20), and an exhaust air introduction port (20a) is opened in the mounting plate (20) above the HST type continuously variable transmission (14). The exhaust fan inlet (20a) includes a shroud (43), and the shroud (43) fixes the cooling fan (42) on the input shaft (14b) of the HST continuously variable transmission (14). Since it covered the outside of the That the cooling air is furnished by a shroud flow to efficiently HST type continuously variable transmission, the engine can be cooled at the same time improving the cooling performance. Moreover, since an opening is restrict | limited by a shroud, sound insulation can be improved.

  Further, the engine is placed and fixed on the mounting plate, an air exhaust port is provided on one side of the mounting plate, and the space between the other surroundings and the member covering the engine is sealed, and the mounting plate is cooled with a cooling duct. As part of this, the sound insulation of the engine room can be improved, and the cooling air that has cooled the radiator and engine can be exhausted to the outside along the mounting plate. There is no need to provide it, the number of parts can be reduced, and the cost can be reduced.

  As described in claim 2, a cooling exhaust port (46) is provided on the rear side of the mounting plate (20), a silencer (24) is disposed at an end of the cooling exhaust port (46), and the silencer Since the exhaust communication pipe (40) communicating between the vessel (24) and the engine (8) is fixed to the mounting plate (20), the exhaust communication pipe can be cooled by the exhaust air, and the utilization rate of the exhaust air can be reduced. This eliminates the need for a separate fixing member for the exhaust communication pipe, thereby reducing costs.

  Next, embodiments of the invention will be described. FIG. 1 is an overall side view of a traveling vehicle equipped with a vertical engine at the rear, FIG. 2 is a side cross-sectional view showing a configuration for introducing cooling air in a bonnet that houses the vertical engine, and FIG. 4 is a rear sectional view, FIG. 5 is a plan view of an anti-vibration support structure of the engine, FIG. 6 is a plan view of an anti-vibration support member, FIG. 7 is a front view, and FIG. FIG. 6 is a side cross-sectional view of a cooling configuration in a bonnet housing a conventional vertical engine.

  First, a work vehicle 1 equipped with a vertical engine 8 will be described with reference to FIG. A main frame 2 comprising a front frame 2a and a rear frame 2b is configured, the front wheel 3 is suspended from the front frame 2a, the rear wheel 4 is suspended from the rear frame 2b, and the front frame 2a and the rear frame 2b are It is pivotally supported. A front column 5 is erected on the front frame 2 a, and the front wheel 3 can be steered by a steering handle 6 provided on the front column 5. A driver seat 7 is placed on the front frame 2 a at the rear of the front column 5. Is placed. A vertical type engine 8 is supported on the rear frame 2 by means of an anti-vibration support member 11 to be described later, and a lower outer peripheral portion of the engine 8 is covered with a rear cover 10, and is mounted on the rear cover 10. The bonnet 9 is placed, and the rear lower part of the bonnet 9 is pivotally supported on the rear part of the rear cover 10 so that it can be rotated rearward and upward.

  As shown in FIGS. 1 and 2, the engine 8 is of a vertical type, and its output shaft 8a is projected between the rear frames 2 and 2 arranged in parallel in the left-right and front-rear directions. A traveling device driving pulley 12 and a work machine pulley 13 are fixed on the shaft 8a. The HST type continuously variable gear is interposed between the rear wheels 4 and 4 below the engine 8 via the belt 15 from the traveling device driving pulley 12. Power is transmitted to the transmission 14 so that the rear wheels 4 can be driven via an axle that protrudes laterally from the HST continuously variable transmission 14. The working machine pulley 13 transmits a driving force to a mower 17 suspended from the front lower portion of the work vehicle 1 via a belt 16 to perform a cutting operation.

  Next, as shown in FIG. 5, the structure for mounting and supporting the engine 8 is such that the rear frames 2a and 2a are connected by connecting frames 2c and 2d, and the vibration isolating support members 11 and 11 are mounted on the connecting frames 2c and 2d. 11 and 11 are mounted, and an engine mounting plate 20 having a rectangular shape in plan view is screwed and fixed onto the vibration-proof support members 11, 11, 11 and 11. The mounting plate 20 is configured to have a concave shape when viewed from the side. The engine 8 is mounted on the mounting plate 20 in the recessed portion, and the vibration-proof support members 11, 11, 11, 11 are disposed at the four corners to prevent the mounting plate 20. I try to support it. Further, as shown in FIG. 2, a seal member 32 made of sponge, rubber, synthetic resin or the like is interposed between the front outer side of the mounting plate 20 and the front lower inner side of the rear cover 10. Being prevented from leaking in between. The same sealing member 32 is also disposed between the mounting plate 20 and the rear frame 2a or between the mounting plate 20 and the rear cover 20 to prevent leakage. In this manner, the periphery of the engine 8 is covered by the mounting plate 20, the rear cover 10, and the bonnet 9, and is also used as a sound insulation member, so that it is not necessary to provide a special sound insulation member, thereby reducing the cost.

  In addition, a substantially circular exhaust air introduction port 20a is opened at the rear portion of the mounting plate 20, and an exhaust air port 46 is formed at a predetermined interval between the rear end of the mounting plate 20 and the rear portion of the rear cover 10. The exhaust outlet 46 is disposed, and an opening for exhausting exhaust air is provided between the engine room and the outside as described later. A silencer 24 is arranged at the rear lower part of the rear cover 10 which is the lower part of the opening, and the silencer 24 is fixed via a stay 25 protruding rearward and downward from the left and right center of the rear end of the mounting plate 20. Exhaust gas is exhausted from the position farthest from the driver's seat 7 at the rear of the cooling exhaust port 46, and the sound is silenced.

  As shown in FIGS. 6 to 8, the anti-vibration support member 11 includes a lower fixing portion 50 and an upper fixing portion 51 connected via an anti-vibration rubber 52, and the lower fixing portion 50 has a cross section. The shape is formed in a “U” shape with the top open, and the bottom that becomes the closing surface is fixed on the frame 2c or 2d using bolts, and the outer periphery of the cylinder 53 is placed in the open surface above the lower fixing portion 50. The surface is fixed or placed, and the anti-vibration rubber 52 is formed into a cylindrical shape inside with the axial center of the cylindrical body 53 being horizontally oriented, and the connecting shaft 54 is fitted through the central portion thereof.

  In addition, the upper fixing portion 51 is formed in a “U” shape with the lower portion opened in a side view, and the anti-vibration rubber 52 is provided in the opening surface of the connecting shaft 54 and the upper fixing portion 51 below the upper fixing portion 51. The upper fixing part 51 is connected to the lower fixing part 50 via the vibration isolating rubber 52 by inserting the connecting shaft 54 into the inner peripheral surface of the vibration isolating rubber 52. . The upper part of the upper fixing part 51 is formed in a rectangular shape in plan view, a rectangular opening is provided in the center part, and screw shafts 55 and 55 are provided on both sides of the upper fixing part 51 so as to project upward. The plate 20 can be screwed together.

  This anti-vibration support member 11 has a larger elastic constant b in the direction perpendicular to the axial direction of the anti-vibration rubber 52 than the elastic constant a in the axial direction of the cylindrical anti-vibration rubber 52. .

  As shown in FIG. 5, the anti-vibration support members 11, 11, 11, 11 are arranged on the main frame 2 and the frames 2 c, 2 d on the front, rear, left, and right sides, respectively. The engine is mounted on the corners. Furthermore, the direction orthogonal to the shaft core having a large elastic constant of the vibration isolating support members 11, 11, 11, 11 is substantially aligned with the radial direction of the output shaft 8a. Therefore, the front and rear and left and right vibrations of the engine 8 are absorbed, and the mounting plate 20, the rear frame 2b, and the rear cover 10 are sealed by the seal member 32, so that noise leaks even if there is vibration. It is preventing. The cooling air of the engine 8 is guided by the mounting plate 20 to the exhaust air inlet 20a and the exhaust port 46. The mounting plate 20 also serves as a part of the cooling duct, the engine mount, and the soundproofing material. It is configured.

  A cooling fan 21 is fixed to the upper end of the crankshaft of the engine 8, a radiator 22 is disposed above the cooling fan 21, an air cleaner 26 is disposed behind the engine 8, and a fuel tank is disposed behind the air cleaner 26. 23 is arranged.

  As shown in FIGS. 2 to 4, the outer peripheral portion of the cooling fan 21 above the engine 8 is covered with a shroud 29, and the radiator 22 is covered with an engine side duct 30 and a bonnet 9, and the bonnet 9 is opened. The filter disposed on the upper surface of the radiator 22 can be visually observed, and maintenance such as replacement can be easily performed. The engine side duct 30 is fixed to the engine 8 side, and a horizontal plate 30a that partitions the cooling fan 21 and the radiator 22, and a side plate 30b that rises upward by bending the left and right side portions and the rear portion of the horizontal plate 30a. 30b and rear plate 30c, the outer peripheral end of which is formed in an arc shape substantially matching the inner shape of the bonnet 9, and a seal member 31 made of sponge, rubber, synthetic resin or the like between the outer peripheral end surface and the bonnet 9. To prevent leakage.

  The horizontal plate 30a is provided with a communication port 30d having a quadrangular shape in plan view that substantially matches the shape of the radiator 22 so that cooling air is sent to the engine 8 by the cooling fan 21. A duct inlet 30e having a relatively large width is opened on the side (left side), and an insertion hole 30f is opened on the other side (right side).

  A bonnet side duct 33 communicates with the duct inlet 30e. The bonnet side duct 33 is formed in a substantially inverted L shape in side view along the rear upper part and the rear surface of the bonnet 9, and the fuel tank 23 in the bonnet 9 is provided. Etc., and is fixed to the inner surface of the bonnet 9. The left and right widths of the bonnet side duct 33 are formed substantially equal to the left and right widths of the radiator 22 to ensure a large flow path, and the front end portion of the bonnet side duct 33 is shaped to match the width of the duct inlet 30e. An intake pipe 27 is inserted into the insertion hole 30f, and the intake side end of the intake pipe 27 is positioned facing the engine side duct 30 so that cooling air can be sucked. Is communicated with an air cleaner 26 disposed at the rear of the engine 8.

  Further, the rear part of the bonnet side duct 33 extends to the rear lower part of the bonnet 9 and is closed, and a seal member is interposed between the rear part 10 and the bulging part 10a bulged upward from the rear part of the rear cover 10. Disguise. Cooling air intakes 9a, 9a, and 9a are opened on the rear surface of the bonnet 9 so that the cooling air can be taken in from a position further away from the operator, and the cooling air intakes 9a, 9a, and 9a are elongated to the left and right. A plurality of openings are arranged at regular intervals above and below to increase the opening area, making it easier to take in outside air.

  When the cooling fan 21 is driven in this way, outside air is taken into the hood side duct 33 from the cooling air inlets 9a, 9a, 9a, flows into the engine side duct 30, and flows downward through the radiator 22 to the engine 8. Is cooled, flows rearward along the mounting plate 20 constituting the engine mount, and is exhausted from an opening at the rear of the engine room behind the mounting plate 20.

  Therefore, the cooling air intakes 9a, 9a, and 9a are not opened above the engine 8 as in the prior art, but are opened at positions away from the driver's seat 7, and the other openings are only the exhaust ports 46 below the openings. Therefore, leakage of engine sound and the like leaks to the outside from the cooling air intakes 9a, 9a and 9a and the exhaust port 46, which are far away, and the noise on the driver's seat 7 is considerably reduced. It is.

  Further, the engine side duct 30 constituting the cooling flow path is fixed to the engine 8 as described above, and the bonnet 9 is separated from the bonnet side duct 33 fixed to the bonnet 9. When rotating around the fulcrum 41, the complicated work of removing the engine side duct 30 from the engine 8 can be eliminated, and maintenance of the engine 4, the air cleaner 26, etc. can be easily performed.

  Further, the air taken into the bonnet 9 is cleaned. That is, the cooling air intakes 9a, 9a, and 9a are covered with the mesh-shaped first filter 34 having a coarse mesh so that large dust such as cut grass does not enter the bonnet side duct 33. Further, a second filter 35 having a fine mesh is interposed in the middle portion (bent portion in this embodiment) of the bonnet side duct 33 formed in a substantially inverted L shape when viewed from the side. The second filter 35 is mounted in a slanting manner so that dust or the like drops downward due to vibrations of the engine 8, drops and accumulates at the rear lower part of the bonnet side duct 33, and the bonnet 9 is opened easily. It can be cleaned. Moreover, by making it incline with respect to the cross section of the bonnet side duct 33, the area of this 2nd filter 35 becomes larger than the area of the cross section of the bonnet side duct 33, and in the external air which flows through the inside of the bonnet side duct 33 Dust is surely removed.

  The outside air cleaned in two stages by the first filter 34 and the second filter 35 is sent into the engine side duct 30 from the front end of the bonnet side duct 33 through the duct inlet 30e, and is sent to the net disposed on the upper surface of the radiator 22. It prevents clogging due to dust and the like. In addition, air in the engine side duct 30 is cleaned in two stages as described above, and this air is taken into the air cleaner 26 through the intake pipe 27, so that the burden on the air cleaner 26 can be reduced. The life can be extended, and the low temperature outside air is sucked and the combustion efficiency is improved.

  Further, as shown in FIG. 2, a plate having a plurality of cooling air exhaust ports 45 a, 45 a... Opened at the air exhaust port 46 between the rear portion of the mounting plate 20 and the rear portion of the rear cover 10 constituting the engine mount. 45 is arranged to limit the amount of exhaust air discharged outside the engine room.

  As shown in FIGS. 2 and 5, a hydraulic pump 14a of the HST continuously variable transmission 14 is disposed below the rear portion of the mounting plate 20, and exhaust air is placed on the mounting plate 20 at the upper position. An inlet 20a is opened, and an input pulley 44 and a fan 42 are fixed on the input shaft 14b of the hydraulic pump 14a projecting upward. The shroud 43 is covered with a substantially cylindrical shape matching the shape of the exhaust air introduction port 20a so that the exhaust air is exhausted downward to cool the hydraulic pump 14a. The shroud 43 prevents noise from spreading in all directions.

  Further, a notch 20b is provided in a part of the outer peripheral portion of the exhaust air introduction port 20a, and the notch 20b passes through the exhaust communication pipe 40 and is connected to the silencer 24. . The exhaust communication pipe 40 is fixed to the mounting plate 20 and disposed in the exhaust air flow path.

  Therefore, the exhaust air sent downward by the cooling fan 21 to cool the engine 8 flows rearward along the mounting plate 20 where the opening of the engine room is provided, and the exhaust communication pipe on the mounting plate 20. 40, and a part of the exhaust air passes through the cooling air outlets 45a, 45a,..., Cools the silencer 24 provided at the air outlet 46, and is discharged outside the engine room.

  Further, the remaining cooling exhaust air is sucked from the exhaust air introduction port 20a by driving the fan 42, flows downward along the outer periphery of the hydraulic pump 14a of the HST continuously variable transmission 14, and is cooled. Stable driving force is obtained by suppressing an increase in the oil temperature in the step transmission 14.

  Further, the cooling exhaust vents 45a, 45a,... Can be replaced with a larger opening area, thereby increasing the amount of exhaust air flowing to the silencer 24 side and increasing the cooling efficiency of the silencer 24. By reducing the opening area of the cooling exhaust ports 45a, 45a,..., The amount of exhaust air exhausted from the exhaust air introduction port 20a can be increased, and the cooling efficiency of the HST type continuously variable transmission 14 can be improved. By providing and changing the plates 45 having different opening areas of the cooling exhaust vents 45a, 45a,..., The running performance can be adapted to the region and the use situation.

  In addition, a duct for sucking cooling air of the engine 8 is provided in the upper part of the bonnet 9, and an engine side duct forming part 30 attached to the engine 8 and a hood side duct 33 attached to the bonnet 9 are provided. Since the filter 35 is arranged in the bonnet side duct 33 and the suction side end portion of the intake pipe 27 of the air cleaner 26 is arranged in the engine side duct molding portion 30, it is large when sucking into the duct. Air after sucking out dust and dirt is sucked in, the burden of clogging is reduced, the life of the air cleaner is extended, the cost can be reduced, and the intake noise of the air cleaner can be reduced. .

  Further, in a work vehicle equipped with a vertical type engine, a duct for cooling air intake of the engine is provided in the bonnet, and the engine side duct attached to the engine and the bonnet side duct attached to the bonnet Since the filter is arranged in the bonnet side duct with respect to the cross section of the duct, air cleaned by the filter can be supplied to the radiator, and dust or the like may adhere to the radiator net and cause clogging. Disappear. Also, when the bonnet is opened, the bonnet duct is lifted together with the bonnet, the upper part around the engine can be opened, and maintenance such as air cleaner and engine oil can be performed, and the intake of the cooling air above the radiator that is the duct inlet The condition of clogging of filter dust can be judged from the outside, and the maintainability is improved. Moreover, the opening and closing structure of the bonnet can be simplified.

  In addition, a suction duct and an exhaust duct are provided in the engine room that houses the engine, and an intake port for the suction duct and an exhaust port for the exhaust duct are provided at positions away from the driver's seat. Therefore, in the conventional configuration in which the intake of cooling air is provided directly above the engine, the intake is located near the driver's seat, and noise leaks from the intake and deteriorates the operator's operating environment. However, since the cooling air intake port and the exhaust port are located away from the driver's seat, the noise from the engine that the operator can hear is reduced and reduced to improve the work environment.

1 is an overall side view of a traveling work vehicle equipped with a vertical engine at the rear. It is side surface sectional drawing which shows the introduction structure of the cooling air in the bonnet which accommodated the vertical engine. It is a top view partially broken sectional view similarly. It is a back sectional view similarly. It is a top view of the vibration proof support structure of an engine. It is a top view of a vibration isolating support member. It is also a front view. It is side surface sectional drawing similarly. It is side surface sectional drawing of the cooling structure in the bonnet which accommodated the conventional vertical engine.

Explanation of symbols

7 Driver's seat 8 Vertical engine 9 Bonnet 9a Cooling air inlet 14 HST type continuously variable transmission 14b Input shaft 20 Mounting plate 20a Exhaust air inlet 21 Cooling fan 22 Radiator 26 Air cleaner 27 Intake pipe 30 Engine side duct forming part 33 Bonnet side duct 34 First filter 35 Second filter 40 Exhaust communication pipe 42 Fan 43 Shroud

Claims (2)

  In a work vehicle equipped with a vertical engine (8) and covered with a bonnet (9), the engine (8) is placed and fixed on a placement plate (20). The space between (20) and the bonnet (9) covering the engine (8) is sealed so that the mounting plate (20) is a part of the cooling duct and is placed below the mounting plate (20). An HST type continuously variable transmission (14) is arranged, and an exhaust air introduction port (20a) is opened in the mounting plate (20) above the HST type continuously variable transmission (14). (20a) comprising a shroud (43), and the shroud (43) covered the outside of the cooling fan (42) fixed on the input shaft (14b) of the HST continuously variable transmission (14). Cooling of a work vehicle equipped with a vertical engine Mechanism.   The cooling mechanism for a vertical engine-equipped work vehicle according to claim 1, wherein a cooling exhaust port (46) is provided on the rear side of the mounting plate (20), and a silencer (24) is provided at an end of the cooling exhaust port (46). ), And an exhaust communication pipe (40) communicating between the silencer (24) and the engine (8) is fixed to the mounting plate (20). .

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