JP7143837B2 - work vehicle - Google Patents

Description

The present invention relates to a work vehicle such as a tractor.

Conventionally, as a work vehicle in which an exhaust gas treatment device is installed near the engine, a bracket having a bonnet rotation fulcrum is provided at the upper rear of the engine, and a DPF (Diesel Particulate Filter) device or the like is installed at the bottom of the bracket to purify exhaust gas. A working vehicle with a fixed device is known (Patent Document 1).

JP 2013-151185 A

In the above-described conventional work vehicle, the DPF device is attached using a bracket having a pivot point of the bonnet, thereby eliminating the need for a separate support member.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work vehicle in which a plurality of devices or components can be efficiently arranged on a single support bracket mounted near the engine to reduce the number of mounting parts.

The above problems of the present invention are solved by the following means.

That is, the invention according to claim 1 is
an engine (3) mounted on the front part of the vehicle body (2) ;
a steering wheel (16) arranged behind the engine (3);
a plate-like support bracket (50) attached to the rear part of the engine (3) in an upright state;
with
A mounting device (56) is provided on the front side of the support bracket (50), and an exhaust gas treatment device (60) is installed via the mounting device (56),
A mounting bracket (57) is provided on the rear side of the support bracket (50), and a steering hydraulic control unit (70) is installed via the mounting bracket (57) ,
The tractor is characterized in that the steering hydraulic control unit (70) is connected to the steering wheel (16) .

The invention according to claim 2 is the tractor according to claim 1, wherein the support bracket (50) is mounted in such a manner that the upper part of the support bracket (50) protrudes above the upper part of the engine (3). The exhaust gas treatment device (60) is mounted above the engine (3), and the mounting device (56) is a fixing member ( 58).

The invention according to claim 3 is the tractor according to claim 1 or 2, wherein a side cover (80) covering a side part of the engine (3) is attached to the side parts (52A, 52B) of the support bracket (50). ) is provided with a mounting jig (59).

The invention according to claim 4 is the tractor according to any one of claims 1 to 3, wherein a bonnet (13) covering a part of the engine (3) is provided on the upper part of the support bracket (50). It is characterized in that it is provided with a rotation support bracket (28) for rotatably supporting it.

The invention according to claim 5 is the tractor according to any one of claims 1 to 4, wherein a lifting hole (53) for hooking a member for lifting the engine (3) is provided on the upper part of the support bracket (50). ) is provided.

In the invention according to claim 1, the exhaust gas treatment device (60) is provided via a mounting device (56) on the front side of a plate-like support bracket (50) attached to the rear part of the engine (3). A steering hydraulic control unit (70) is provided on the rear side of the support bracket (50) via a mounting bracket (57). As a result, there is no need to separately prepare dedicated mounting parts for installing the exhaust gas treatment device (60) and the steering hydraulic control unit (70) near the engine (3), and they can be ) are efficiently placed near
Therefore, according to the present invention, a plurality of devices or components can be efficiently arranged on a single support bracket mounted near the engine to reduce the number of mounting parts.

According to the second aspect of the invention, the exhaust gas treatment device (60) is mounted on the plate-like support bracket (50) mounted in such a manner that the upper part protrudes above the upper part of the engine (3). 3) A reinforcement member that prevents the support bracket (50) from falling over, even though it is installed above the exhaust gas treatment device (60). The support bracket (50) is maintained in a stable state without the possibility of falling down, and the exhaust gas treatment device (60) can be arranged in a stable state.

According to the third aspect of the invention, since the mounting jig (59) for mounting the side cover (80) is provided on the side of the support bracket (50), Also, the side cover (80) can be easily placed and attached via its attachment jig (59).

According to the fourth aspect of the invention, the rotation support bracket (28) for the bonnet (13) is provided above the support bracket (50). ), the size can be reduced compared to a dedicated bracket that is configured to be directly attached near the .

According to the fifth aspect of the invention, there is no need to separately provide a dedicated lifting attachment part for hooking a member for lifting the engine (3), and the number of attachment parts can be reduced.

1 is a left side view of a tractor according to an embodiment of the invention; FIG. FIG. 2 is a perspective view showing the configuration of the engine and its surroundings in the tractor of FIG. 1; 3 is a perspective view of the engine of FIG. 2 with some devices and parts removed; FIG. FIG. 4 is a perspective view of the engine of FIG. 3 with further components removed; FIG. 3 is a perspective view showing a support bracket and the like attached to the engine of FIG. 2 as viewed from the front side; FIG. 6 is a perspective view showing the support bracket and the like of FIG. 5 as viewed from the back side; 3 is an enlarged perspective view showing a part of the configuration of the engine of FIG. 2 and its surroundings; FIG. FIG. 8 is a front view showing the configuration of the engine of FIG. 7 and its surroundings; FIG. 9 is a front view showing an enlarged part of the configuration of the engine of FIG. 8 and its surroundings;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a tractor 1 as an example of a work vehicle according to an embodiment of the invention.
The tractor 1 has a pair of left and right front wheels 11 and rear wheels 12 and 12 arranged on the left and right sides of the vehicle body 2 on the front and rear sides.
An engine 3 is mounted in a space surrounded by a bonnet 13 that can be opened and closed in the front part of the vehicle body 2. - 特許庁The bonnet 13 is configured to cover an upper surface portion, a front portion, and upper portions of left and right side portions, which are part of the engine 3 .
A power transmission device 4 is provided from the center to the rear of the vehicle body 2 to transmit the rotational power of the engine 3 to both front wheels 11 and rear wheels 12, 12 or only to the latter (rear wheels). . The power transmission device 4 includes a clutch mechanism, a main transmission device, an auxiliary transmission device, a forward/reverse switching mechanism, a differential device, and the like (none of which are shown) arranged in the transmission case 40 .

In addition, the tractor 1 includes a lower link 29 to which a working machine such as a rotary tiller (not shown) is mounted at the rear part of the vehicle body 2 (rear part of the transmission case 40), a coupling device such as a link mechanism, and the engine 3 to the mounted working machine. A PTO shaft 49 is provided for outputting rotational power.

Furthermore, the tractor 1 is provided with a cabin 14 serving as a control room in a portion from the central portion of the vehicle body 2 to the middle of the rear portion. Inside the cabin 14, a driver's seat 15 and a steering wheel (steering wheel) 16 for steering the front wheels 11, 11 are arranged.

A handle post 21 below the steering wheel 16 is provided with a forward/reverse lever 17 that is operated when switching between forward and reverse travel. A throttle lever (not shown) that is operated when adjusting the rotation speed of the engine 3 is provided on the side of the handle post 21 opposite to the forward/reverse lever 17 . A meter panel 23 is installed in front of the steering wheel 16 of the handle post 21 to display information necessary for steering and the like. On the left side of the operator's seat 15, operation levers such as a main shift lever 24 are arranged.
A step floor 22 is provided below the cockpit 15 and the steering wheel 16 in the cabin 14 . Operation tools such as a brake pedal 18 and a clutch pedal 19 are provided on the step floor 22 .

2 to 4 show the engine 3 and devices or parts installed near it. FIGS. 3 and 4 are shown with some of the devices or parts located near the engine 3 shown in FIG. 2 removed.

A diesel engine, for example, is used as the engine 3 . As shown in FIG. 4 and the like, the engine 3 has a cylinder head 32, a cylinder cover 33, and the like provided in the upper portion of a cylinder block 31, and an oil pan 34 provided in the lower portion of the cylinder block 31. As shown in FIG. In addition, the engine 3 is provided with a cooling fan 35 and the like in the front portion of the cylinder block 31, and a flywheel case 36 and the like in which a flywheel connected to the crankshaft is arranged in the lower rear portion of the cylinder block 31. ing.
The cylinder block 31 is provided with a plurality of cylinders in which a plurality of pistons coupled to a crankshaft (not shown) are arranged to reciprocate. The cooling fan 35 is rotated by a fan belt 38 that is wound around and rotated by related parts such as a pulley connected to the crankshaft and an alternator 37 .

In the tractor 1, as shown in FIGS. 2 and 3, a plate-shaped support bracket 50 is attached to the rear portion of the engine 3 in an upright state.
Also, in this tractor 1, as shown in FIG. A mounting bracket 57 is provided on the rear side of the bracket 50, and a steering hydraulic control unit 70 is mounted via the mounting bracket 57. As shown in FIG.

First, as shown in FIGS. 5 and 6, the support bracket 50 includes a body portion 51 made of a substantially rectangular flat plate having a required length and width and elongated in the vertical direction, and left and right ends of the body portion 51. The bracket has a plate-like left side plate portion 52A and a plate-like right side plate portion 52B that are bent rearward at substantially right angles.

Of these, the body portion 51 has a front face 51a on the side facing the forward direction of the tractor 1 when attached, and a rear face 51b on the side facing the reverse direction of the tractor 1 at that time. Both the left side plate portion 52A and the right side plate portion 52B have a shape in which the upper portion protrudes rearward from the lower portion. In addition, the support bracket 50 has a concave or U-shaped cross section when viewed from the upper end side.

The lower part 51c of the main body part 51 of the support bracket 50 is screwed with a fixing screw 9Na to a fixing part 55 having four screw holes on the mounting surface formed on the rear surface of the cylinder head 32 in the upper part of the engine 3. stopped and fixed.
At this time, as shown in FIGS. 2 and 3, the support bracket 50 is attached with the upper portion 51d of the body portion 51 projecting upward from the upper portion of the engine 3 (for example, the cylinder cover 33).

Next, as shown in FIG. 6 and the like, the mounting fixture 56 for installing the exhaust gas treatment device 60 includes annular holding portions 56a and 56b arranged independently on the left and right sides to hold the exhaust gas treatment device 60, An attachment fixing portion 56c that supports the holding portions 56a and 56b and attaches and fixes them to the front side of the support bracket 50. As shown in FIG.

The holding portions 56a and 56b are configured to hold the outer peripheral surface of the exhaust gas treatment device 60, which has a substantially cylindrical appearance, in a tightened state by adjusting the tightening screws. The mounting fixing portion 56c is fixed to the central upper portion 51d side of the front surface 51a of the main body portion 51 of the support bracket 50 with four pairs of bolts and nuts 9Nb.

The exhaust gas treatment device 60 is a device for purifying the exhaust gas discharged from the engine 3 consisting of a diesel engine. and are connected in series to allow the exhaust gas to pass through. DOC performs a process of oxidizing harmful substances in the exhaust gas to render them harmless. The DPF performs a process of collecting particulate matter contained in the exhaust gas.
2, 3, etc., the exhaust gas treatment device 60 is attached to the support bracket 50 via an attachment tool 56 so as to be positioned above the engine 3. As shown in FIGS.

As shown in FIG. 7 and the like, the exhaust gas treatment device 60 according to the present embodiment is configured such that the exhaust gas discharged through an exhaust manifold (not shown) of the engine 3 passes through the exhaust turbine section 42B of the turbocharger 42 and is exhausted. It is taken in from the connection pipe 43 for. Further, the exhaust gas treated by the exhaust gas treatment device 60 is discharged from the exhaust pipe 44 and exhausted to the outside through the exhaust muffler 48 (FIG. 1), as shown in FIG. 7 and the like.

Next, as shown in FIG. 2 or FIG. 9, the mounting bracket 57 on which the steering hydraulic control unit 70 is installed comprises left and right mounting side plate portions 57a and 57b arranged facing each other with a gap left and right. , and upper and lower mounting fixing portions 57c, 57d for connecting the left and right mounting side plate portions 57a, 57b at their upper and lower ends and mounting and fixing the upper and lower ends of the mounting side plate portions 57a, 57b to the rear surface side of the support bracket 50. consists of

The left and right attachment side plate portions 57a and 57b have an external shape that is bent so as to protrude rearward. It has become. 5 and the like, the upper and lower fixing portions 57c and 57d are fixed to the lower side of the center of the rear surface 51b of the main body portion 51 of the support bracket 50 by four pairs of bolts and nuts 9Nd.

The steering hydraulic control unit 70 uses, for example, a hydraulic steering assist device such as Orbitroll (registered trademark). The steering hydraulic control unit 70 is fixed to the rearward slanted portions of the left and right mounting side plate portions 57 a and 57 b of the mounting bracket 57 .
As shown in FIG. 2, the steering hydraulic control unit 70 has a column shaft (not shown) of the steering wheel 16 connected to an input shaft 71 projecting rearward and upward, and a plurality of hydraulic pipes 73 (not shown). Connected to hydraulic pump. A hydraulic pump of the tractor 1 is connected to operate a steering cylinder 75, and the front wheels 11, 11 are steered by adjusting the directions of the front wheels 11, 11 by a tie rod 76 which is displaced by the operation of the steering cylinder 75.

Also, in the tractor 1, as shown in FIGS. 2 and 3, a rotation support bracket 28 is provided above the support bracket 50 to rotatably support the bonnet 13 covering at least a portion of the engine 3. is provided.

As shown in FIGS. 5 and 6, the rotary support bracket 28 includes plate-like left and right support body portions 28a and 28b which are arranged with a required space left and right, and left and right support body portions 28a and 28b. Plate-shaped left and right mounting surface portions 28c and 28d provided continuously from the lower portion of 28b to approach the respective outer surfaces of the left side plate portion 52A and the right side plate portion 52B of the support bracket 50, and the left and right support main body portions 28a, 28d. 28b, and bearing portions 28f provided at the upper end portions of the left and right support body portions 28a and 28b, respectively.
The bearing portion 28f is configured by a support shaft or a bearing hole depending on the configuration of the rotary mounting portion of the bonnet 13. As shown in FIG.

The left and right mounting surfaces 28c and 28d of the rotatable support bracket 28 are connected to two upper and lower sets of bolts and nuts 9Nc through screw holes provided in the upper ends of the left and right side plates 52A and 52B of the support bracket 50. It is attached by being fixed with each.
The bonnet 13 is attached to the bearing portions 28f of the left and right support main body portions 28a and 28b of the rotation support bracket 28 at the rotation attachment portions thereof. As a result, the bonnet 13 is opened by rotating the front side of the bonnet upward with the bearing 28f as a fulcrum, as illustrated by the two-dot chain line in FIG. can be done.

In the tractor 1 described above, the exhaust gas treatment device 60 is installed on the front side of the support bracket 50 attached to the rear part of the engine via the mounting fixture 56, and on the rear side of the support bracket 50 via the mounting bracket 57. Since the steering hydraulic control unit 70 is installed, there is no need to separately prepare dedicated mounting parts for installing the exhaust gas treatment device 60 and the steering hydraulic control unit 70 near the engine 3. are efficiently located near the engine 3.
Therefore, in this tractor 1, a plurality of devices or components can be efficiently arranged on one support bracket 50 attached near the engine 3, and the number of attachment parts can be reduced.

Further, in the tractor 1, the rotation support bracket 28 for the bonnet 13 is provided above the support bracket 50. Therefore, as the rotation support bracket 28, a dedicated bracket configured to be directly attached near the engine 3 is provided. It can be made smaller than the As a result, in the tractor 1, in addition to reducing the number of attachment parts, it is also possible to make the attachment parts smaller.

3, 5, 6, etc., the attachment device 56 in this embodiment includes a fixing member 58 that is attached to and fixed to the upper portion of the engine 3. As shown in FIGS.

As shown in FIGS. 5 and 6, the fixing member 58 includes a substantially horizontal support portion 58a that supports the mounting fixing portion 56c of the mounting device 56 from below, and a left side that hangs down from the left end of the support portion 58a. It is a member having a shape having a fixing portion 58b and a right fixing portion 58c hanging down from the right end of the support portion 58a. The support portion 58 a is joined and fixed to the mounting fixing portion 56 c of the mounting device 56 . The left fixing portion 58b is fixed to, for example, the left side surface of the cylinder head 32 by being positioned or screwed with a stud 58e or a fixing screw (not shown). The right fixing portion 58c is fixed to, for example, the right side surface portion of the cylinder cover 33 by screwing with a fixing screw.

As a result, in the tractor 1, the exhaust gas treatment device 60 is installed above the engine 3 on the plate-like support bracket 50 which is attached in such a manner that the upper portion protrudes above the upper portion of the engine 3. In spite of this, the mounting fixture 56 of the exhaust gas treatment device 60 and the fixing member 58 work together to function as a reinforcing member that prevents the support bracket 50 from falling.
As a result, in the tractor 1, the support bracket 50 is kept in a stable state without the possibility of falling down, and the exhaust gas treatment device 60 can be arranged in a stable state.

Further, as shown in FIGS. 2 and 3, the support bracket 50 in the present embodiment is a part (for example, rear end) of the left and right side covers 80A and 80B covering the left and right side portions of the engine 3, respectively. A mounting jig 59 for mounting the is provided.

The left and right side covers 80A and 80B discharge heat from the left and right side portions of the engine 3 not covered by the bonnet 13, and prevent hands from accidentally approaching the operating engine 3. It is.
As shown in FIG. 3, the side covers 80A and 80B are composed of an air-permeable cover member 81 having a shape corresponding to the area to be covered, and a holding member 82 that holds the cover member 81 in a desired shape. It is As the cover member 81, for example, a punched metal or the like is applied.

As shown in FIGS. 7 and 8, the mounting jig 59 is a support arm portion having a desired shape for connecting and supporting the rear end portions of the side covers 80A and 80B and the side portion of the support bracket 50. a fixing portion for fixing one end of the support arm to a part of the holding member 82 inside the rear end portion of the side cover 80A, 80B by screwing or the like; It has a mounting portion for mounting with bolts and nuts on the lower outer side of the left side plate portion 52A and the right side plate portion 52B. The support arm portion is composed of a round bar-shaped member.

As a result, in the tractor 1, even around the side portion of the engine 3, parts of the side covers 80A and 80B can be easily arranged via the attachment jig 59 attached to the side portion of the support bracket 50. can be installed.

5, 6, 8, etc., the support bracket 50 according to the present embodiment is mounted on the upper portion of the main body portion 51 during manufacture or removal of the engine 3, and during assembly of the tractor 1. A hoisting hole 53 is provided for hooking a hoisting member used when hoisting the engine 3 at such times.
Examples of the lifting member include hooks, wires, and chains. The lifting holes 53 are set under conditions that match the shape and dimensions of the member to be lifted. As the lifting hole 53, a vertically elongated hole is formed.

As a result, in the tractor 1, there is no need to separately provide a dedicated lifting attachment part for hooking a member for lifting the engine 3, and the number of attachment parts can be reduced. Incidentally, in this engine 3, as shown in FIG. 4, a lifting attachment part 85 having a lifting hole formed in the front part of the engine 3 is provided in a state of protruding upward from the upper part of the engine 3. ing.

Further, as shown in FIG. 4 and the like, the engine 3 in the present embodiment reduces the amount of oxygen by returning part of the exhaust gas to the intake side and mixing it, thereby reducing the generation of nitrogen oxides Nox. An exhaust gas recirculation device (EGR: Exhaust Gas Recirculation) 45 is provided.

The exhaust gas recirculation device 45 is provided so as to connect between an EGR cooler 45c that cools the returning exhaust gas and a position in the middle of the intake manifold 47, as shown in FIG. Reference numeral 45a in FIG. 4 denotes an exhaust gas return pipe that branches from an exhaust manifold (not shown), passes through an EGR valve 45v, and is connected to an EGR cooler 45c. Further, reference numeral 45b denotes an exhaust gas mixing pipe that flows the returned exhaust gas into a position in the middle of the intake manifold 47 to mix it.
A bellows portion 46 is provided between the exhaust gas return pipe 45a and the exhaust gas mixing pipe 45b to absorb stress due to thermal expansion and vibration. The bellows portion 46 is a joint portion having a bellows-like appearance with a larger diameter than the exhaust gas return pipe 45a and the exhaust gas mixing pipe 45b, and is arranged close to the rear surface of the cylinder head 32.

The support bracket 50 in the present embodiment is attached so as to be positioned between the rear surface of the cylinder head 32 and the exhaust gas recirculation device 45, as shown in FIGS. In order to prevent the bellows portion 46 from interfering (contacting) with the rear surface 51 b of the main body portion 51 , an interference avoidance opening (relief portion) 54 is provided in a portion of the main body portion 51 facing the bellows portion 46 .
The interference avoidance opening 54 in the present embodiment is formed as a horizontally elongated rectangular hole from the viewpoint of ensuring the strength of the lower portion of the support bracket 50 . The interference avoiding opening 54 may have any shape as long as it can avoid interference with the bellows portion 46, and may be an opening having another opening shape.

Further, the engine 3 in the present embodiment is provided with a crankcase purification device (CCV: Closed Crankcase Ventilation) 90 for purifying exhaust gas from the crankcase, as shown in FIG. 4 and the like.

Therefore, as shown in FIGS. 8 and 9, a plate-like mounting bracket 91 for installing the crankcase cleaning device 90 is attached to the lower part of the left side plate portion 52A of the support bracket 50 with bolts and nuts 9Ne. It is fixed and installed. At least a portion of the crankcase cleaning device 90 is screwed to the mounting bracket 91 and fixed.

In the above-described embodiment, a configuration example using a DOC and a DPF as the exhaust gas treatment device 60 is shown, but the exhaust gas treatment device 60 is not limited to this. A selective reduction Nox catalyst (SCR: Selective Catalytic Reduction) that purifies contained nitrogen oxides may be applied.

The present invention is not limited to vehicles for agricultural work such as tractors, but can be applied to vehicles for various other work.

1 … Tractor (working vehicle)
3 Engine 13 Bonnet 28 Rotating support bracket 50 Support bracket 53 Hoisting hole 56 Mounting device 57 Mounting bracket 59 Mounting jig 60 Exhaust gas treatment device 70 Steering hydraulic control unit 80 Side cover

Claims (5)

an engine (3) mounted on the front part of the vehicle body (2) ;
a steering wheel (16) arranged behind the engine (3);
a plate-like support bracket (50) attached to the rear part of the engine (3) in an upright state;
with
A mounting device (56) is provided on the front side of the support bracket (50), and an exhaust gas treatment device (60) is installed via the mounting device (56),
A mounting bracket (57) is provided on the rear side of the support bracket (50), and a steering hydraulic control unit (70) is installed via the mounting bracket (57) ,
A tractor , wherein said steering hydraulic control unit (70) is connected to said steering wheel (16) . The support bracket (50) is mounted with its upper portion protruding above the upper portion of the engine (3),
The exhaust gas treatment device (60) is mounted above the engine (3),
A tractor according to claim 1, characterized in that said mounting device (56) comprises a fixing member (58) mounted and fixed to the top of said engine (3). A mounting jig (59) for mounting a side cover (80) covering a side portion of the engine (3) is provided on the side portions (52A, 52B) of the support bracket (50). Item 3. The tractor according to Item 1 or 2. A rotatable support bracket (28) for rotatably supporting a bonnet (13) covering a part of the engine (3) is provided on the upper part of the support bracket (50). 4. The tractor according to any one of 1 to 3. A tractor according to any one of claims 1 to 4, wherein a lifting hole (53) for hooking a member for lifting the engine (3) is provided in the upper part of the support bracket (50). .

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