JP2012201159A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the waterproof properties of an engine control unit against water invading into an engine room from the lower side.SOLUTION: A tractor includes: an engine room ER in which the forward side of the cab is covered with a hood 9 and in which an engine is installed; a radiator 11 disposed ahead of the engine in the engine room ER; and a partition board 31b which is provided between the hood 9 and the outer periphery of the radiator 11 and partitions the engine room in a front/rear direction. The engine control unit 14 is disposed ahead of the partition board 31b and on the upper side than the radiator 11 in the engine room ER.

Description

  The present invention is configured by being surrounded by a bonnet on the front side of the operation unit, an engine room in which the engine is mounted, a radiator disposed in front of the engine in the engine room, and an outer periphery of the bonnet and the radiator The present invention relates to a tractor including a partition plate provided in between and partitioning the engine room back and forth.

  Conventionally, as such a tractor, there existed the thing of patent document 1, for example. In the tractor described in Patent Document 1, a bottom plate is fixed to an upper part of a front frame of a machine body that is connected to an engine and extends to the front side of a radiator, and a battery is connected to the front of the engine room via a battery stand. It is arranged floating from the bottom plate. An engine control unit (in the literature, “engine control unit”) is disposed in an engine control unit arrangement space between the battery base and the bottom plate.

  According to the tractor described in Patent Document 1, the engine control unit is connected to the radiator without obstructing the arrangement of the battery and other vehicle auxiliary equipment (air cleaner, reserve tank for radiator, condenser, intercooler, oil cooler, etc.). Can be disposed on the windward side (on the side of the radiator opposite to the engine). As a result, the engine control unit is hardly affected by the engine heat, and the battery stand can prevent washing water, muddy water, and the like that have entered the engine room from directly entering the engine control unit.

JP 2008-81016 A (paragraphs [0006] to [0008], [0011] to [0014], FIGS. 1, 2 and 7)

  However, not only water enters the engine room from the upper side, but water may also enter the engine room from the lower side, for example, when washing the lower side of the vehicle body. Therefore, in the tractor described in Patent Document 1 in which the engine control unit is disposed at the bottom of the engine room, the engine control unit is waterproofed. In addition, since the engine control unit is arranged at a position away from the engine, the harness connecting the detection device and control device around the engine and the engine control unit is lengthened, and a space is required for handling. Met.

  In view of such circumstances, an object of the present invention is to provide a tractor that improves the waterproofness of an engine control unit against water entering the engine room from below.

  The first characteristic configuration of the tractor according to the present invention is formed by surrounding the front side of the operating portion with a bonnet, and is disposed in front of the engine in the engine room in which the engine is mounted and the engine room. A radiator, a partition plate provided between the bonnet and the outer periphery of the radiator, and partitioning the engine room back and forth, and an engine control unit in the engine room in front of the partition plate and the partition It exists in the point arrange | positioned above a radiator.

  With this feature configuration, the engine control unit is disposed in the engine room in front of the partition plate and above the radiator. That is, the present invention devised the layout of vehicle auxiliary equipment (air cleaner, radiator reserve tank, condenser, intercooler, oil cooler, etc.) in the engine room, particularly on the front side of the radiator. In addition, a space is created in the upper part of the engine room, and an engine control unit is disposed in the space. As a result, the engine control unit moves away from the lower side of the vehicle body, and the waterproofness of the engine control unit against water entering the engine room from the lower side is improved.

  In addition, the engine control unit is located in the upper area of the engine rule. Easy visual inspection and easy replacement when engine control unit fails.

  A second characteristic configuration of the tractor according to the present invention is that a bracket projecting forward from the partition plate is provided, and the engine control unit is supported by the bracket.

  According to this feature configuration, since the engine control unit is supported by the bracket adjacent to the partition plate, the position of the engine control unit is closer to the engine than in the prior art. Therefore, the length of the harness connecting the detection device and control device around the engine and the engine control unit can be shortened, and the handling space is also reduced.

  A third characteristic configuration of the tractor according to the present invention lies in that a support column is provided to stand from a front frame of the airframe connected to the engine and support the bracket from below.

  According to this feature configuration, the lower side portion of the bracket is supported by the body front frame via the support column. That is, the stability of the bracket is increased, and the engine control unit and the air cleaner are stably supported.

  A fourth characteristic configuration of the tractor according to the present invention is that at least one of an air cleaner and a reserve tank for the radiator is attached to the support column or the bracket.

  In the case of this feature configuration, at least one of an air cleaner, which is another vehicle auxiliary machine, and a reserve tank for a radiator is attached to the column or bracket, so that a member that supports the engine control unit, a member that supports the air cleaner, etc. Can also be used to suppress an increase in the number of parts.

  A fifth characteristic configuration of the tractor according to the present invention includes a rear column that is erected in a rear portion of the engine room, and a heat shield that is attached to the rear column and partitions the engine room and the operating unit. The partition plate and the rear support column or the heat shield plate are connected by a connecting member.

  With this feature configuration, the partition plate that is stably supported at the front part of the engine room is connected to the rear support column or the heat shield plate that is stably supported at the rear part of the engine room via the connecting member. The members are integrated to form a robust frame body as a whole. Therefore, various vehicle auxiliary machines attached to these members can be supported more stably.

It is the whole tractor side view. It is a side view which shows the layout in an engine room. It is a top view which shows the layout in an engine room. It is a perspective view from the front left upper part which shows the layout in an engine room. It is a perspective view from the front right upper part which shows the layout in an engine room. It is a perspective view from the upper left rear which shows the layout in an engine room. It is a perspective view from the upper left front which shows the frame structure in an engine room. It is a perspective view from the upper left rear which shows the frame structure in an engine room. It is a disassembled perspective view which shows the attachment structure of each vehicle auxiliary machine in the front side rather than a radiator. It is a left view which shows the attachment structure of each vehicle auxiliary machine. It is a vertical left view which shows the attachment structure of ECU. It is a perspective view from the upper left front which shows the layout in the engine room which concerns on 1st another embodiment. It is a perspective view from the front right upper part which shows the layout in the engine room which concerns on 1st another embodiment. It is a disassembled perspective view which shows the attachment structure in the front side rather than the radiator of each vehicle auxiliary machine which concerns on 1st another embodiment.

  Hereinafter, an example in which the present invention is applied to a four-wheel tractor will be described with reference to the drawings.

[Outline of the tractor]
As shown in FIG. 1, the tractor includes an engine 1, a clutch housing 4, and a transmission case 5. The body front frame 2 facing in the front-rear direction is fixed to the left and right outer surfaces of the engine 1, and the front ends thereof are connected by a front bracket 3. The traveling machine body is configured by connecting the engine 1 and the transmission case 5 back and forth via the clutch housing 4. The front wheel FW is supported on the body front frame 2, and the rear wheel RW is supported on the mission case 5.

  A cabin 6 as an “operating unit” is disposed behind the engine 1 and above the clutch housing 4 and the transmission case 5. An engine room ER is formed by enclosing the front side of the front end portion of the cabin 6 with a bonnet 9, a front grille 7, and left and right side panels 8. That is, the engine 1 is mounted in the engine room ER. The bonnet 9 is swingable up and down with a rear upper end portion (a swing shaft 36a (see FIGS. 7 and 8) described later) of the engine room ER as a swing fulcrum, and can be opened forward. Then, an upper heat shield 33 and a lower part that will be described later are provided between the engine room ER and the cabin 6 so that the exhaust heat of the engine 1 does not flow into the cabin 6 and the cabin 6 is not heated by the exhaust heat. It is partitioned by a heat shield plate 34.

  The cabin 6 includes a driver's seat 6a, a front panel 6b equipped with various meters, switches, and the like, and a steering handle 6c that steers the front wheels FW. Inside the front panel 6b, a power steering controller 6d, a brake cylinder 6e, a clutch valve 6f, and the like are provided. The power steering controller 6d, the brake cylinder 6e, the clutch valve 6f, and the like are located between the front panel 6b and the lower heat shield plate 34. The lower heat shield 34 is detachably attached to a rear post frame 32 described later.

  The engine 1 is a diesel engine. Although not particularly shown around the engine 1, for example, control equipment such as an accumulator fuel injection device (common rail injection system), a fuel supply pump, an exhaust circulation device, an intake air temperature sensor, an intake air pressure sensor, a water temperature sensor, Many detection devices such as load sensors are provided. The engine room ER is provided with an engine control unit (hereinafter referred to as “ECU”, see FIG. 2) 14 that receives information from the detection device and appropriately controls the control device.

[Layout in the engine room]
The layout of the vehicle auxiliary machine in the engine room ER will be described. As shown in FIG. 2, the engine 1 is arranged at the tail end of the engine room ER, and the radiator 11 is arranged on the front side of the engine 1. A dustproof net (not shown) is detachably attached to the front surface of the radiator 11. The radiator 11 has a width over both the left and right inner surfaces of the engine room ER. A fan shroud 12 is provided on the back side of the radiator 11, and a fan 13 is provided as shown in FIG. The fan 13 is driven by the engine 1, sucks external air into the engine room ER via the front grill 7 and the like, and sends the air from the front of the radiator 11 to the engine 1 side. As shown in FIG. 9, the radiator 11 has a lower portion supported by the airframe front frame 2, and an upper portion supported by a partition plate 31 b described later that partitions the engine room ER forward and backward.

  As shown in FIG. 9, on the front side of the radiator 11, a flat base frame 30 is provided over the upper parts of the left and right airframe front frames 2. As shown in FIG. 10, auxiliary members 30c facing the left and right sides of the fuselage are fixed to the upper portions of the left and right fuselage front frames 2, and the base frame 30 is bolted to the auxiliary members 30c. As shown in FIG. 2, the battery 19 is placed and fixed on the base frame 30 at the forefront of the engine room ER. As shown in FIGS. 2, 4, 5, and 9, a battery mounting portion 30 a for positioning and fixing the battery 19 is formed on the upper surface portion of the base frame 30 by bending a sheet metal. In addition, a lower rail portion 30b for supporting a capacitor 15 described later from below is attached to the upper surface portion of the base frame 30. The lower rail portion 30b is made of round steel and is configured to have an inverted U shape when viewed from the front. Both lower ends of the lower rail portion 30b are welded and fixed to the base frame 30, and are erected from the base frame 30.

  As shown in FIGS. 2, 3, 4, and 5, between the radiator 11 and the battery 19, a condenser 15 that condenses refrigerant of an air conditioner (not shown) disposed in the cabin 6 and the intake air to the engine 1 are cooled. The intercooler 16 and the oil cooler 17 are arranged in this order from the side close to the radiator 11 in a posture parallel to the radiator 11. A fuel cooler 18 is disposed below the intercooler 16. The condenser 15, the intercooler 16, the fuel cooler 18, and the oil cooler 17 are supported by a front post frame 31 that will be described later, and are positioned approximately in the center in the left-right direction of the machine body. Note that the gaps among the radiator 11, the condenser 15, the intercooler 16, the fuel cooler 18, and the oil cooler 17 are set as small as possible to make the engine room ER compact in the longitudinal direction of the body.

  As shown in FIGS. 2, 3, 4, and 5, the ECU 14 is disposed in front of the partition plate 31 b and at a position above the radiator 11. Further, a reserve tank 20 for the radiator 11 is disposed in front of the ECU 14. The ECU 14 and the reserve tank 20 are located substantially above the condenser 15, the intercooler 16, etc., and are located in the engine room ER, approximately in the center in the left-right direction of the machine body and in the vicinity of the upper part in the front-rear direction of the machine body. An air cleaner 21 is disposed in front of the reserve tank 20. The air cleaner 21 is located substantially above the battery 19 and in the engine room ER, slightly to the right in the left-right direction of the machine body and slightly to the top of the front part in the front-rear direction of the machine body. The ECU 14, the reserve tank 20, and the air cleaner 21 are supported by a front post frame 31 described later. As shown in FIGS. 2, 3, and 4, the two fuse boxes 22 and the relay socket 23 are disposed at a location on the substantially left side of the reserve tank 20. The fuse box 22 and the relay socket 23 are also supported by the front post frame 31.

  In the engine room ER, on the rear side of the partition plate 31b, a muffler 24 is disposed as a main component in addition to the engine 1, as shown in FIGS. Two muffler attachment members 37 made of angle members are attached to the upper portion of the engine 1 in the front-rear direction and in an attitude parallel to each other. Then, the muffler 24 is placed on the left and right muffler mounting members 37 and fixed with bolts. The muffler 24 is based on a DPF (Diesel Particulate Filter) system that complies with exhaust gas regulations, and is considerably larger than the conventional muffler 24. Therefore, the height of the engine room ER of this tractor is set slightly higher than the conventional one as a whole. Further, a turbocharger 25 is disposed in front of the muffler 24 and above the engine 1 and on the left side of the engine room ER.

  Hereinafter, an outline of the flow of intake air (intake) to the engine 1 will be described (particularly, refer to FIGS. 3 to 5). The air is sucked into the air cleaner 21 from the downward intake port 21a and removed, and then moves to the rear of the partition plate 31b via the first intake pipe 26 passing through the left side of the ECU 14 and flows into the turbocharger 25. . The air compressed by the turbocharger 25 is moved further forward than the partition plate 31b through the second intake pipe 27 passing under the first intake pipe 26 and flows into the intercooler 16. The air cooled by the intercooler 16 moves to the rear of the partition plate 31b on which the engine 1 is disposed, and is supplied to the intake port 1a of the engine 1 via a third intake pipe 28 that passes through the right side of the ECU 14. The

[About the front post frame]
As shown in FIGS. 7 and 8, the front post frame 31 is erected from the horizontal member 31 a attached over the upper portion of the radiator 11 and the rear end portion of the horizontal member 31 a, and the engine is bordered on the radiator 11. A partition plate 31b for partitioning the room ER forward and backward, a pair of left and right brackets 31c projecting forward from the partition plate 31b, an AC bracket 31d for attaching the air cleaner 21, and an ECU front cover 31e surrounding the front side of the ECU 14 A base plate 31g (see FIG. 10) that is bolted to the auxiliary member 30c together with the base frame 30, and a pair of left and right support columns 31f and 31f that are provided substantially vertically from the base plate 31g and support the left and right brackets 31c from below. And are integrally provided. The horizontal member 31a, the partition plate 31b, the bracket 31c, the AC bracket 31d, and the ECU front cover 31e are formed by bending a sheet metal. Moreover, the support | pillar 31f is comprised by the round pipe.

  As shown in FIG. 10, the horizontal member 31 a is formed in a substantially L-shaped cross section so as to follow the upper shape of the radiator 11. The support 31f is formed of a round pipe. The partition plate 31 b is formed in a shape along the inner shape of the bonnet 9. A packing material that closes the gap between the bonnet 9 and the partition plate 31b when the bonnet 9 is closed is attached to the outer peripheral portion of the partition plate 31b. The partition plate 31b is provided with notches and holes so that the first intake pipe 26, the second intake pipe 27, and the third intake pipe 28 described above can be penetrated (see FIGS. 7 and 8).

  As shown in FIG. 7, the bracket 31c has its rearmost part welded to the partition plate 31b and its base side lower part welded to the horizontal member 31a. About both the support | pillars 31f, the upper end part is welded to the inner surface of the bracket 31c. With this configuration, the front post frame 31 and the radiator 11 form a gate-shaped frame in a side view, and are stabilized at each stage as compared with the case where only the respective feet are fixed to the base frame 30.

  As shown in FIG. 7, the AC bracket 31d is supported by welding its both end portions to the front end portions of the left and right brackets 31c. Since the AC bracket 31d attaches the air cleaner 21 and requires a relatively large area, the height of the AC bracket 31d is set higher than the height of the bracket 31c. As shown in FIGS. 7 and 11, the AC bracket 31d is arranged with the upper end position aligned with the upper end position of the bracket 31c. The ECU front cover 31e is formed in a U-shaped cross section as shown in FIG. 11, and is welded in a posture in the left-right direction of the machine body slightly forward of the center of the left and right brackets 31c.

  As shown in FIGS. 3 and 7, a fuse bracket 31h is welded to the outer surface of the left bracket 31c in a posture in the left-right direction of the fuselage. The fuse bracket 31h is L-shaped in front view and supports the fuse box 22. In addition, as shown in FIGS. 5 and 7, the upper rail portion 31i is welded over substantially the entire length of the lower end portion of the front surface of the horizontal member 31a. The upper rail portion 31i is disposed at a position corresponding to the lower rail portion 30b described above in the longitudinal direction of the machine body, and can be engaged with an upper end portion of a case 15a (see FIG. 9) of the capacitor 15 described later. A downward groove is formed (see FIGS. 10 and 11).

[Assembly to front post frame of vehicle accessories]
The assembling procedure to the front post frame 31 of the vehicle auxiliary equipment such as the ECU 14 and the air cleaner 21 and the reserve tank 20 will be described in detail. As shown in FIG. 11, the ECU 14 is bolted to the upper part of the horizontal member 31a and the upper part of the lower part of the ECU front cover 31e. Then, the ECU 14 is covered with an ECU upper cover 38 (see FIG. 9) from above, the front end of the ECU upper cover 38 is bolted to the ECU front cover 31e, and the rear end of the ECU upper cover 38 is attached to the partition plate. It is bolted to 31b. In this way, the upper, left, right, front and rear of the ECU 14 are covered with the ECU upper cover 38, the ECU front cover 31e, and the partition plate 31b.

  As shown in FIGS. 3, 9, 10, and 11, the reserve tank 20 is disposed in a space surrounded by the AC bracket 31d, the left and right brackets 31c, and the ECU front cover 31e, and is disposed at the front of the ECU front cover 31e. Bolts are fixed. The air cleaner 21 is bolted to the front part of the AC bracket 31d as shown in FIGS.

  As shown in FIG. 9, the capacitor 15 is surrounded on all sides by a case 15a, and a dustproof net 15b is detachably disposed at the front thereof. When the capacitor 15 is assembled, the upper end portion and the lower end portion of the case 15a are engaged with the upper rail portion 31i and the lower rail portion 30b, respectively, as shown in FIGS. Is bolted to the upper rail portion 31i. Therefore, the capacitor 15 is fixed to the front post frame 31 and the base frame 30 and stabilized. When the bolt 15 is released, the capacitor 15 can be pulled out to the left outer side of the machine body with the upper rail 31i and the lower rail 30b as guides with the bonnet 9 opened (indicated by a two-dot chain line in FIG. 1). It is. This facilitates maintenance of the dustproof net 15b and the like.

  As shown in FIGS. 2, 9, and 10, the intercooler 16 is disposed immediately after the left and right columns 31f and 31f, and is bolted to mounting portions (not indicated) welded to the left and right columns 31f and 31f. . The oil cooler 17 is disposed immediately before the left and right support columns 31f and 31f, and is bolted to attachment portions (not indicated) welded to the support columns 31f and 31f. The fuel cooler 18 is disposed immediately after the left and right support columns 31f and 31f and below the intercooler 16, and is attached to the base frame 30 and an attachment portion (not indicated) welded to the support columns 31f and 31f. Bolts are fixed to the part (not indicated).

  As shown in FIGS. 3, 9, and 10, the two fuse boxes 22 are disposed so as to sandwich the fuse bracket 31h from the front and rear, and are bolted to the fuse bracket 31h. As shown in FIGS. 3, 4, 5 and 9, the relay socket 23 is disposed between the reserve tank 20 and the left bracket 31c, and is bolted to the inner surface of the left bracket 31c.

  In this way, in the engine room ER, in particular, the layout of each vehicle auxiliary machine is devised particularly in front of the radiator 11, and a space is created on the windward side of the radiator 11 and above the engine room ER. Therefore, it is possible to improve the waterproofness of the ECU 14 against water entering from the lower side of the engine room ER during car washing or the like. Further, since the ECU 14 is surrounded on the left, right, and front and back, it is possible to prevent dust and sand from entering.

  Further, since the front post frame 31 is supported and stabilized by the radiator 11 and the base frame 30 and many peripheral devices are assembled to the front post frame 31, the parts are compared with the case where a support member is provided for each device. The score can be kept low.

  Furthermore, since the ECU 14 is supported by the bracket 31c adjacent to the partition plate 31b, the position of the ECU 14 is closer to the engine 1 than in the prior art. Therefore, the length of the harness connecting the detection device and control device around the engine 1 and the ECU 14 can be short, and the handling space is also reduced.

[About the post frame]
As shown in FIGS. 7 and 8, the rear post frame 32 is bolted to the upper end of the rearmost end of the engine 1 (see FIGS. 2, 3, 4 and 6), and in a slightly forward inclined posture from the base plate 32a. Two standing right and left support columns 32b and 32b, an upper plate 32d connecting the upper ends of the left and right support columns 32b and 32b, and a mounting plate welded to the left and right support columns 32b and 32b in the horizontal direction of the machine body And 32c. An upper heat shield plate 33 and a lower heat shield plate 34 are attached to the rear post frame 32.

  In the present embodiment, a suspension (not shown) is provided at the lower part of the cabin 6, and the cabin 6 can swing back and forth around the lower front end thereof as a fulcrum. Therefore, the support column 32b is inclined forward as described above so that the cabin 6 and the support column 32b do not come into contact with each other. That is, when the cabin 6 is not provided with a suspension, the support column 32b may be in a forward leaning position or may not be in a forward leaning position.

  Since the base plate 32a is attached to the upper part of the engine 1 via the cushion rubber G, the vibration of the traveling machine body (engine 1 or the like) is absorbed. The support column 32b is configured by a round pipe. As shown in FIG. 2, the support column 32 b extends to the upper part of the engine room ER until the position of the upper end portion of the support column 32 b becomes substantially the same as the position of the upper end portion of the muffler 24. Further, the support column 32b is bent at a position corresponding to approximately the center of the muffler 24 in the height direction. A portion of the support column 32b above the bent portion is inclined forward (forwardly tilted) toward the upper side along the shape of the muffler 24. A portion of the support column 32b below the bent portion extends in a generally vertical direction, although it is in a slightly forward tilted posture. As shown in FIG. 7, the upper plate 32d is formed by bending a sheet metal, and the upper ends of both columns 32b and 32b are welded to the lower surface of the upper plate 32d. The upper surface portion of the upper plate 32d is substantially horizontal as shown in FIG. As shown in FIGS. 7 and 8, the mounting plate 32 c is welded to the back portions of both the columns 32 b and 32 b at two positions above and below the bent portion of the column 32 b.

[For connecting the front and rear post frames]
As shown in FIGS. 7 and 8, the front post frame 31 and the rear post frame 32 are connected by a connecting member 35. The connecting member 35 includes two round pipes oriented in the longitudinal direction of the fuselage, a front connecting member 35a having a substantially L-shaped cross section that connects the front ends of both round pipes, and a cross section that connects the rear ends of both round pipes. A substantially L-shaped rear connecting member 35b. As shown in FIG. 11, the front end portion of the connecting member 35 is fixed to the front post frame by bolting the front connecting member 35a near the lower end of the partition plate 31b having a high strength, with the connecting member 35 in a slightly lower front posture. 31 is connected. As shown in FIGS. 4, 5 and 7, the rear end portion of the connecting member 35 is connected to the rear post frame 32 by bolting the rear connecting member 35 b to the upper surface portion of the upper plate 32 d.

  Accordingly, the support column 31f that is stably supported by the base frame 30 at the front portion of the engine room ER and the support column 32b that is stably supported by the engine 1 at the rear portion of the engine room ER are connected to the connecting member 35, the partition plate 31b, and the bracket 31c. It is connected via. As a result, the front post frame 31 and the rear post frame 32 are integrated to form a solid frame body as a whole. Therefore, each vehicle auxiliary machine attached to the front post frame 31 and the rear post frame 32 can be further stably supported.

  A swing shaft support member 36 to which a swing shaft 36a serving as a swing fulcrum of the bonnet 9 is fixed is fixed to the upper portion of the rear connecting member 35b. The swing shaft support member 36 includes a flat base member 36b that is fixed to the rear connecting member 35b, and a pair of left and right ring members 36c that are fixed to the upper portion of the base member 36b in a posture in the horizontal direction of the body. ing. The attachment portion 9b of the bonnet 9 is disposed between the left and right ring members 36c, and the swing shaft 36a is inserted and held between the left and right ring members 36c and the attachment portion 9b. As a result, the bonnet 9 can swing up and down around the swing shaft 36a in the horizontal direction of the machine body.

  Note that the base member 36 b protrudes rearward of the upper heat shield plate 33 from a location where the upper portion of the upper heat shield plate 33 is cut into a concave shape. That is, the swing shaft 36a is disposed in a space between the upper heat shield plate 33 and the upper portion of the cabin 6 (near the rear of the upper portion of the upper heat shield plate 33) (see FIG. 2). As a result, when the bonnet 9 is opened, the upper rear end portion of the bonnet 9 can enter the space between the upper heat shield plate 33 and the upper portion of the cabin 6. As a result, it is not necessary to arrange the bonnet 9 at a high position in order to secure a space for the upper rear end of the bonnet 9 to enter, and the installation height of the bonnet 9 can be suppressed low. Further, when the bonnet 9 is closed, a frame (not shown) of the bonnet 9 that is pivotally supported by the swing shaft 36 a is accommodated in a cut portion of the upper heat shield plate 33.

  In the vicinity of the center of the connecting member 35 in the longitudinal direction of the machine body, there are two left and right damper mounting portions 35c for attaching a damper 9a for assisting the opening and closing operation of the bonnet 9 and buffering the impact caused by the opening and closing operation. The bottom end portion of the damper 9a is attached to the damper attaching portion 35c in a state where it can swing up and down. The damper 9a is a conventional one and will not be described in particular.

  As a result, the load of the bonnet 9 is applied to the rear post frame 32 and the connecting member 35. However, as described above, the rear post frame 32 is connected to the front post frame 31 to form a robust frame body. Therefore, the bonnet 9 is stably supported, and the bonnet 9 can be opened and closed smoothly.

[Heat shield mounting structure]
As shown in FIGS. 2, 7, and 8, the upper heat shield plate 33 is attached to the support column 32b in a forward inclined posture between the bent portion of the support column 32b and the lower surface of the bonnet 9 (the range of the inclined portion of the support column 32b). It is a flat steel plate that partitions the upper part of the engine room ER and the upper part of the cabin 6. The lower heat shield 34 is attached to the column 32b between the bent part of the column 32b and the upper part of the engine 1 (the range of the vertical part of the column 32b), and connects the lower part of the engine room ER and the lower part of the cabin 6 to each other. It is a flat steel plate that partitions. The upper heat shield plate 33 and the lower heat shield plate 34 cooperate to partition the engine room ER and the cabin 6 without any gap (except for a space such as a harness). The upper heat shield plate 33 is welded and fixed to the back portions of both the columns 32b and 32b. As shown in FIGS. 7 and 8, the lower heat shield plate 34 is fixed to the upper and lower mounting plates 32 c by two bolts SB at both the left and right ends. The upper heat shield plate 33 and the lower heat shield plate 34 correspond to the “heat shield plate” according to the present invention, and both the columns 32b and 32b correspond to the “rear column” according to the present invention.

  As shown in FIGS. 2, 7, and 8, the bolts of the lower heat shield 34 to the mounting plate 32 c are fixed to the stud bolt SB projecting forward from the lower heat shield 34 (front-facing body with a detent on the head). And a nut N from the front side of the machine body. The upper and lower mounting plates 32c have lengths extending over both the left and right inner surfaces of the bonnet 9 (see FIG. 3), and the holes through which the stud bolts SB are inserted are as close as possible to the left and right ends of the lower heat shield plate 34. Since it is provided at the position (see FIG. 8), if the bonnet 9 is opened (in this embodiment, the side panel 8 also needs to be removed), the nut N is exposed to a position that can be easily reached.

  Therefore, the bolts to the rear post frame 32 of the lower heat shield 34 are fixed with the nut N from the engine room ER side in a state where the bonnet 9 is opened (in this embodiment, the side panel 8 also needs to be removed). It can be released by loosening. And if bolt fixation is cancelled | released, since the lower thermal-insulation board 34 is flat form, it can slide out to the left-right direction of a body, and can be extracted from engine room ER. In this way, the lower heat shield 34 can be freely removed from the engine room ER side, and by removing the lower heat shield 34, a portion below the muffler 24 in the front portion of the cabin 6 can be obtained. Exposed greatly. That is, the power steering controller 6d, the brake cylinder 6e, the clutch valve 6f, and the like that are installed in the front panel 6b and are located between the front portion of the cabin 6 and the lower heat shield plate 34 are exposed to the engine room ER side. Therefore, when maintaining these components, it is not necessary to remove the front panel 6b, which is an interior member of the cabin 6, and the maintenance can be performed easily.

[First embodiment]
In the above-described embodiment, the layout of each vehicle accessory in the engine room ER has been described. However, these layouts are not limited to this, and other layouts may be used. An example of another layout of each vehicle auxiliary machine in the engine room ER will be described with reference to the drawings. The layout of the reserve tank 20, the fuse box 22, and the relay socket 23 is greatly different between the present embodiment and the above-described embodiment, and the other vehicle auxiliary machines have substantially the same layout. In addition, description is abbreviate | omitted about the same structure as the above-mentioned embodiment, and attaches | subjects the same code | symbol in drawing.

    As shown in FIGS. 12 to 14, the reserve tank 20 is fixed to the RT bracket 31j welded to the front portion of the right side surface (outer side surface) of the right bracket 31c by being deformed from above. In the present embodiment, the left column 31f is fixed to the left side surface (outer surface) of the left bracket 31c, but the right column 31f is provided on the right bracket 31c so as not to obstruct the reserve tank 20. Fixed to the left side (inner side). The fuse box 22 is bolted to a fuse bracket 31h that is welded to the front left portion of the ECU front cover 31e in a posture in the front-rear direction of the fuselage. That is, the fuse box 22 is located above the air cleaner 21. The relay socket 23 is bolted to the upper right part of the front surface of the AC bracket 31d. That is, the relay socket 23 is located above the air cleaner 21 and on the right side of the fuse box 22.

[Other alternative embodiments]
(1) In the above-described embodiment, the rear end portion (rear connecting member 35b) of the connecting member 35 is connected to the upper plate 32d connecting the upper end portions of the left and right support columns 32b in the rear post frame 32. An example is shown, but the present invention is not limited to this. For example, the rear end portion (rear connecting member 35 b) of the connecting member 35 may be connected to the upper heat shield plate 33 fixed to the rear post frame 32. In the above-described embodiment, the front post frame 31 and the rear post frame 32 are connected by the connecting member 35. However, the front post frame 31 and the rear post frame 32 may not be connected.

(2) In the above-described embodiment, the cover member is not particularly provided on the lower side of the ECU 14, but a cover member may be provided on the lower side of the ECU 14 to further improve the waterproofness to the ECU 14.

(3) In the above-described embodiment, the heat shield plate is divided into the upper heat shield plate 33 and the lower heat shield plate 34 in the vertical direction, and only the lower heat shield plate 34 is detachable. The plate 33 may be removable. In addition, although not shown in particular, even if the heat shield plate of the integrated object is configured to be removable, or even if the heat shield plate is divided into three or more and configured to be removable, only a part can be removed. It may be configured. Of course, it may be divided into two in the horizontal direction and extracted in the left and right directions.

(4) In the above-described embodiment, the heat shield plate (lower heat shield plate 34) is slid out in the left-right direction of the machine body, but is not limited thereto. Depending on the open state of the bonnet 9 and the layout around the heat shield, although not shown in the drawing, the heat shield is slid in the vertical direction of the fuselage and pulled out, or rotated around the axis in the longitudinal direction of the fuselage and pulled out. It may be a configuration.

(5) In the above-described embodiment, the example in which the upper heat shield plate 33 and the lower heat shield plate 34 are attached to the back portions of the left and right columns 32b and 32b in the rear post frame 32 has been described. Instead, you may attach to the front part of the support | pillars 32b and 32b on either side. If the function as a heat shield plate can be exhibited, either one of the upper heat shield plate 33 and the lower heat shield plate 34 is attached to the front part of the left and right columns 32b and 32b, and the other is attached to the left and right columns. You may attach to the back part of the support | pillars 32b and 32b.

(6) In the above-described embodiment, an example in which the upper heat shield plate 33 and the lower heat shield plate 34 are made of a steel plate has been shown, but the upper heat shield plate 33 and the lower heat shield plate 34 are not limited thereto. The thing which affixed the heat insulating material on the steel plate may be used.

(7) In the above-described embodiment, the front part of the engine room ER is surrounded by the front grille 7 and the left and right side parts of the engine room ER are surrounded by the side panels 8. A bonnet that serves as both the front grille 7 and the side panel 8 may be further extended.

  The present invention is formed by enclosing the front side of the operation unit with a bonnet, an engine room in which the engine is mounted, a radiator disposed in front of the engine in the engine room, and between the bonnet and the outer periphery of the radiator. It is applicable to a tractor provided with a partition plate that partitions the engine room forward and backward.

1 Engine 2 Airframe front frame 6 Cabin (operating part)
9 Bonnet 11 Radiator 14 ECU (Engine Control Unit)
20 Reserve tank 21 Air cleaner 31b Partition plate 31c Bracket 31f Post 32b Post (rear post)
33 Upper heat shield (heat shield)
34 Lower heat shield (heat shield)
35 Connecting member ER Engine room

Claims (5)

An engine room in which the engine is mounted and the front side of the driving part is surrounded by a bonnet,
A radiator disposed in front of the engine in the engine room;
A partition plate provided between the bonnet and the outer periphery of the radiator, and partitioning the engine room back and forth,
A tractor in which an engine control unit is disposed in front of the partition plate and above the radiator in the engine room. A bracket projecting forward from the partition plate;
The tractor according to claim 1, wherein the engine control unit is supported by the bracket.   The tractor of Claim 2 provided with the support | pillar which stood up from the body front frame connected with the said engine, and supports the said bracket from the downward direction.   The tractor according to claim 3, wherein at least one of an air cleaner and a reserve tank for the radiator is attached to the support column or the bracket. A rear column that is erected at the rear of the engine room, and a heat shield that is attached to the rear column and partitions the engine room and the operating unit,
The tractor according to any one of claims 1 to 4, wherein the partition plate and the rear column or the heat shield plate are connected by a connecting member.

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