JP7197384B2 - work vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle in which an internal combustion engine and an exhaust gas treatment device are arranged in a drive unit.

As a work vehicle of this type, there is a conventional technique described in [1] below.
[1] A mounting frame is provided above the engine in the engine room, and the exhaust gas treatment device is supported by the mounting frame. A heat shield plate is provided between the exhaust gas treatment device and the air cleaner, obliquely downward from the mounting base frame, to suppress the propagation of radiant heat from the exhaust gas treatment device to the air cleaner ( See Patent Document 1).

Japanese Patent Application Laid-Open No. 2014-177914 (paragraph numbers "0047", "0051", see FIGS. 18 and 19)

In the above [1], since the heat shield plate is provided between the exhaust gas treatment device and the air cleaner, it is useful in that it can suppress the propagation of radiant heat from the exhaust gas treatment device to the air cleaner. be. However, there is a problem that the structure tends to be relatively large-scaled because a dedicated mounting frame for supporting the exhaust gas processing device is provided and a heat shield plate is also provided separately from the mounting frame.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the thermal effect of an exhaust gas treatment device on other devices while avoiding an increase in the size of the support structure for the exhaust gas treatment device.

As a means for solving the above problems, in the working vehicle of the present invention, the driving unit is provided with an engine and an exhaust gas treatment device connected to an exhaust manifold of the engine, and the exhaust gas treatment device is attached. The mounting support is connected to a fixed portion integrated with the engine via a support, and the mounting support is provided with a mounting portion connectable to the fixed portion and a connecting portion for connecting the exhaust gas treatment device, A heat shield in which a connection surface portion detachably connected to the mounting portion and a connection piece portion connected and fixed to the exhaust gas treatment device are formed of a series of plate-like bodies in the connection portion. A plate portion is provided, and the heat shield plate portion suppresses conduction of radiant heat between the fixed portion and the exhaust gas treatment device in a state where the exhaust gas treatment device is attached to the mounting support . It is characterized in that a space between the fixed part and the exhaust gas treatment device is shielded, and a space is formed between the outer peripheral surface of the exhaust gas treatment device and the connecting surface portion, through which outside air can flow. .

According to the present invention, the mounting support for the exhaust gas treatment device includes the mounting portion that can be connected to the fixed portion, and the connection portion of the exhaust gas treatment device. It also has a heat shield that suppresses conduction.
Since the mounting support itself for supporting the exhaust gas treatment device is provided with the heat shield plate portion in this way, it is not necessary to attach a dedicated heat shielding member to the mounting support. Therefore, it is possible to reduce the heat effect of the exhaust gas treatment device on other devices on the fixed part side, and at the same time, the structure for mounting the exhaust gas treatment device and shielding heat from the other devices can be made relatively compact. It can be configured, and there is no need to separately assemble and disassemble the heat shielding member.
As a result, it is possible to avoid an increase in the size of the structure for mounting and heat shielding, and to reduce the man-hours for assembly and disassembly.

In the above configuration, the driving unit includes a body frame supported by a traveling device, a driving section disposed on the front side of the body frame, and a driving section disposed on the body frame on the rear side of the driving section. It is preferable that the exhaust gas treatment device is provided between the cargo bed and the exhaust gas treatment device so that the longitudinal direction thereof extends along the front-rear direction, and that the front and rear of the space are open .

According to this configuration, the use of the heat shielding member eliminates the need to dispose the exhaust gas treatment device at a large distance upward from the fixed portion on the engine side, and the vertical height of the driving portion including the exhaust gas treatment device is relatively low and easy to form. For this reason, it is easy to apply to a vehicle having a loading platform on the body frame and a driving portion having a limited height in the vertical direction.

In the above configuration, the engine is disposed in front of the driving unit, the transmission is connected to the rear of the engine, and the exhaust gas treatment device is positioned above the transmission at a rear position away from the engine. preferably, the mounting support is attached to the transmission.

According to this configuration, the exhaust gas treatment device is arranged at a rear position away from the engine and above the transmission connected to the rear of the engine. The mounting support is then attached to the transmission.
Since the exhaust gas treatment device is located rearward from the engine, it is difficult for heat to be transferred from the engine to the exhaust gas treatment device. Since the portion is provided, the thermal influence on the transmission side can be reduced.

In the above configuration, the exhaust gas treatment device is arranged with its longitudinal direction extending in the front-rear direction, and the front end portion of the exhaust gas treatment device and the exhaust manifold are connected by an exhaust introduction pipe extending in the front-rear direction. It is preferable that the lower portion of the exhaust gas treatment device is supported by the mounting support member in a state in which the heat shield plate faces the lower half side of the gas treatment device.

According to this configuration, the front end portion of the exhaust gas treatment device and the exhaust manifold, which are arranged with the longitudinal direction along the longitudinal direction, are connected by the exhaust introduction pipe along the longitudinal direction. Mainly the longitudinal position of the exhaust gas treatment device due to the shaking of the exhaust gas is likely to be restricted by utilizing the rigidity of the exhaust introduction pipe itself along the longitudinal direction. The lateral and vertical positions of the exhaust gas treatment device are regulated by the mounting support that supports the lower part of the exhaust gas treatment device, and is securely supported.
As a result, even if the exhaust gas treatment device is relatively long, it is not necessary to lengthen the mounting support in the front-rear direction, and the exhaust gas treatment device can be securely mounted in the front-back, left-right, and up-down directions. It can be supported in a positionally regulated state.

In the above configuration, it is preferable that the exhaust gas treatment device includes a silencer.

According to this configuration, it is possible to support the exhaust gas treatment device provided with the silencer.

1 is a left side view of a utility vehicle to which the present invention is applied; FIG. It is a left view showing an engine, a transmission, and an exhaust gas processing device in a prime mover of a first embodiment. FIG. 2 is a plan view showing an engine, a transmission, and an exhaust gas treatment device in the driving section of the first embodiment; FIG. 2 is an exploded perspective view showing a transmission and an exhaust gas treatment device in the driving portion of the first embodiment; It is a perspective view which shows the mounting support body of 1st embodiment. It is a left view which shows the engine, transmission, and exhaust-gas processing apparatus in the driving part of 2nd embodiment. FIG. 7 is an exploded perspective view showing a transmission and an exhaust gas treatment device in a driving portion of a second embodiment; FIG. 11 is a perspective view showing the mounting support of the second embodiment;

An example of an embodiment of a working vehicle according to the present invention will be described below with reference to the drawings.
Note that the front-rear direction and the left-right direction in the description of the present embodiment are described as follows unless otherwise specified. That is, when the work vehicle to which the present invention is applied is traveling for work, the direction of travel on the forward side (see arrow F in FIGS. 1 and 2) is "forward" and the direction of travel on the reverse side (see arrow B in FIGS. 1 and 2). is "rear", the direction corresponding to the right side (see arrow R in FIG. 3) is "right", and the direction corresponding to the left side (see arrow L in FIG. 3) is "right". It is "left".

〔overall structure〕
Here, a case where the present invention is applied to a utility vehicle (corresponding to a multi-purpose vehicle), which is an example of a work vehicle, will be described.
As shown in FIGS. 1 and 2, the utility vehicle has a pair of left and right front wheels 1F (corresponding to traveling devices) that can be steered in the front part of the body frame 1 that forms the framework of the running body. A pair of unsteerable left and right rear wheels 1R (corresponding to a travel device) are supported on the rear portion of the body frame 1 .
A driving unit 10 is provided on the upper side of the machine body frame 1 at the central part in the longitudinal direction of the traveling machine body. A loading platform 2 is provided on the upper side of the body frame 1 at the rear part of the traveling machine body, and a driving unit 3 is provided below the loading platform 2. - 特許庁

Driving force can be transmitted to the front wheels 1F and the rear wheels 1R from an engine 4 and a transmission 5 provided in a driving unit 3, which will be described later. As a result, the utility vehicle is configured as a four-wheel drive vehicle, and is used for multi-purpose work such as agricultural work and transportation work.
A rope frame 11 for protecting the driving part 10 is provided at a position surrounding the driving part 10 .

The loading platform 2 has a function of dumping the load by raising the front end side about the horizontal axis x1 in the left-right direction at a position near the rear end. It is supported swingably around the horizontal axis x1. Also, a hydraulic actuator (not shown) is provided for raising and lowering the front end of the loading platform 2 .

The driving unit 10 is provided with a driver's seat 12 on which the driver sits, a steering wheel 13 for controlling the steering of the front wheels 1F, and various operating tools.
A passenger seat is arranged adjacent to the driver's seat 12 . In the space under the seat corresponding to the lower side of the driver's seat 12, an oil cooler (not shown) disposed at a position cooled by a cooling fan 43 of the diesel engine 4, which will be described later, and outside air are supplied to the oil cooler. An air passage for introduction, a battery device (not shown), and the like are provided.

[Structure of motor part]
As shown in FIGS. 2 to 4, the driving unit 3 includes a water-cooled diesel engine 4 (hereinafter simply referred to as an engine), which is an internal combustion engine, and a transmission 5 (engine) fixed to the engine 4. (corresponding to an integral fixed part) and are provided. A radiator (not shown) for water-cooling the engine 4 is arranged inside a front bonnet 14 at the front part of the fuselage.
A driving unit 3 including the engine 4 and the transmission 5 is formed between the body frame 1 and the loading platform 2 arranged on the body frame on the rear side of the driving section 10 .
The transmission 5 includes a transmission case 50 housing a gear transmission (not shown) and a hydrostatic continuously variable transmission 51 . A transmission case 50 is connected and fixed to the rear of the engine 4 , and a hydrostatic continuously variable transmission 51 is connected and fixed to the rear of the transmission case 50 .

The engine 4 has a crankshaft (not shown) extending in the longitudinal direction of the fuselage, and power is supplied to a cooling fan 43 and an alternator 44 via a fan belt 42 from a front output shaft 41 protruding forward of the engine body 40 . configured to transmit. The cooling fan 43 introduces outside air and sends out hot air remaining in the upper space of the oil cooler and the engine 4 located behind the engine 4 to the rear, and brings the blown outside air into contact with the exhaust gas treatment device 30 to be described later. It is for air cooling.

An output shaft (not shown) extending rearward from the rear portion of the engine 4 transmits power to a traveling system and workers. In other words, although not shown, the output from the engine 4 is changed by a hydrostatic continuously variable transmission 51 as a main transmission in the transmission 5, and after being further changed by a gear transmission as an auxiliary transmission, Power is transmitted to the left and right rear wheels 1R, 1R via a rear axle 52 projecting from the transmission case 50 to the left and right sides. Power is transmitted to the front wheels 1F, 1F via a transmission shaft 53 extending forward from the lower portion of the transmission case 50 .

The above are the common embodiments according to the present invention, and the first and second embodiments of the support structure of the exhaust gas treatment device 30 will be described below.
First, the first embodiment will be explained.
[Exhaust gas treatment device of the first embodiment]
As shown in FIGS. 2 and 3, the driving section 3 is provided with an exhaust gas treatment device 30 for purifying exhaust gas from the engine 4 . This exhaust gas treatment device 30 is configured using a diesel particulate filter (DPF) that collects and removes particulate matter containing carbon as a main component contained in the exhaust gas.
This exhaust gas treatment device 30 is configured to perform a regeneration process to heat and burn off the collected particulate matter in order to prevent deterioration of the collection function due to accumulation of the collected particulate matter. It is As a result, the temperature of the exhaust gas discharged during the regeneration process is higher than the exhaust gas of a general engine, regardless of whether the number of revolutions of the engine 4 is high or low.

As shown in FIGS. 2 to 5, the exhaust gas treatment device 30 is attached to the transmission 5, which is a fixed portion integrated with the engine 4, via a mounting support 6. As shown in FIG.
The mounting support 6 is mounted on the upper portion of the transmission case 50 so that the exhaust gas treatment device 30 is located behind the engine 4 . The front end portion 30 a of the exhaust gas treatment device 30 is connected to the exhaust introduction pipe 31 in the attached state to the attachment support 6 . A front end portion of the exhaust introduction pipe 31 is connected to an exhaust manifold 45 of the engine 4 .
In this mounted state, the exhaust gas treatment device 30 is in a posture in which the longitudinal direction thereof extends along the front-rear direction, and the exhaust gas introduction pipe 31 is also arranged in a posture in which the pipe longitudinal direction is substantially along the front-rear direction.

The mounting support 6 includes a mounting portion 60 that can be bolted to the upper left portion of the transmission case 50, and a connecting portion 61 that is detachable from the mounting portion 60 and fixed to the exhaust gas treatment device 30. I have.

The mounting portion 60 is composed of a bent channel-shaped lower plate 62 whose front and rear end portions protrude laterally outward in a plan view, and an upper plate 63 having a flat surface portion 63A that intersects the upper edge of the lower plate 62. The flat surface portion 63A of the upper plate 63 is fixed to the upper edge of the lower plate 62 by welding.
The lower plate 62 has a pair of front and rear first bolt insertion holes 62a through which connection bolts 64 screwed into a pair of front and rear lower screw holes 54, 54 formed on the left side surface of the transmission case 50 can be inserted. , 62a are formed. The first bolt insertion holes 62a, 62a and the lower screw holes 54, 54 are formed at two locations separated by a distance L1 in the front-rear direction.
The upper plate 63 is formed with an upright piece 63B at the end near the left side of the transmission case 50 among the outer peripheral ends of the flat surface portion 63A. A second bolt through which a connection bolt 64 can be screwed into an upper threaded hole 55 formed at a position higher than the lower threaded hole 54 formed in the left side surface of the transmission case 50 can be inserted into the upright piece 63B. An insertion hole 63a is formed. The second bolt insertion hole 63a and the upper screw hole 55 are formed at positions higher than the first bolt insertion hole 62a and the lower screw hole 54 by a vertical height H1.
Also, the second bolt insertion hole 63a and the upper screw hole 55 are offset from the first bolt insertion hole 62a and the lower screw hole 54 toward the center of the transmission case 50 in the horizontal direction by the width W1. .

The connecting portion 61 is located at a position facing the flat plate portion 61A (corresponding to the connecting surface portion) facing the flat surface portion of the mounting portion 60 and the lower half side of the cylindrical exhaust gas treatment device 30. It is formed in a substantially V shape with an upwardly widening inclined plate portion 61B (corresponding to a connecting piece portion) with a wider width.
The weld nut 65 provided on the flat plate portion 61A is located at a position facing the elongated connecting hole 63b (see FIGS. 4 and 5) provided in the flat surface portion 63A of the mounting portion 60 and having a long diameter in the front-rear direction. It is configured to be connectable and disconnectable via a connecting bolt 66 inserted from below into the elongated connecting hole 63b.
An upper end edge 61C of the inclined plate portion 61B that expands upwards of the connecting portion 61 is welded and fixed to the lower half side of the cylindrical exhaust gas treatment device 30 .

As described above, the connecting portion 61 provided at a position facing the lower half side of the cylindrical exhaust gas treatment device 30 covers the lower half side of the cylindrical exhaust gas treatment device 30 and also treats the exhaust gas. A space S1 through which outside air can flow is formed between the outer peripheral surface of the device 30 and the outer surface of the transmission case 50 .
As a result, the flat plate portion 61A and the slanting plate portion 61B of the connecting portion 61 serve as the connecting portion 61 of the mounting support 6, and conduct radiant heat between the transmission case 50 and the exhaust gas treatment device 30. It also functions as a heat shield plate portion 67 that suppresses the heat.

Next, a second embodiment will be described with reference to FIGS. 6 to 8. FIG.
[Exhaust gas treatment device of the second embodiment]
The motor unit 3 is provided with an exhaust gas treatment device 30 in the middle of the exhaust gas exhaust path of the engine 4 . This exhaust gas treatment device 30 is configured using a muffler having a muffler chamber for reducing exhaust gas emission noise.
In such a structure using a silencer as the exhaust gas treatment device 30, the same structure can be adopted not only when the engine 4 is a diesel engine but also when a gasoline engine is used.

As shown in FIGS. 6 to 8, the exhaust gas treatment device 30 is attached to the transmission 5, which is a fixed portion integrated with the engine 4, via a mounting support 6. As shown in FIG.
The mounting support 6 is mounted on the upper portion of the transmission case 50 so that the exhaust gas treatment device 30 is located behind the engine 4 . The front end portion 30 a of the exhaust gas treatment device 30 is connected to the exhaust introduction pipe 31 in the attached state to the attachment support 6 . A front end portion of the exhaust introduction pipe 31 is connected to an exhaust manifold 45 of the engine 4 .
In this mounted state, the exhaust gas treatment device 30 is in a posture in which the longitudinal direction thereof extends along the front-rear direction, and the exhaust gas introduction pipe 31 is also arranged in a posture in which the pipe longitudinal direction is substantially along the front-rear direction.

The mounting support 6 includes a mounting portion 60 that can be bolted to the upper left portion of the transmission case 50, and a connecting portion 61 that is detachable from the mounting portion 60 and fixed to the exhaust gas treatment device 30. I have.

The mounting portion 60 includes, in a plan view, a lower plate 62 bent so that the front end portion of the vertical wall portion extending in the front-rear direction protrudes laterally outward, and a flat surface portion intersecting the upper edge of the lower plate 62. The flat surface portion 63A of the upper plate 63 is fixed to the upper edge of the lower plate 62 by welding.
The lower plate 62 has a pair of front and rear first bolt insertion holes 62a through which connection bolts 64 screwed into a pair of front and rear lower screw holes 54, 54 formed on the left side surface of the transmission case 50 can be inserted. , 62a are formed. The first bolt insertion holes 62a, 62a and the lower screw holes 54, 54 are formed at two locations separated by a distance L1 in the front-rear direction. In this second embodiment, the distance L1 in the front-rear direction between the lower screw holes 54 and 54 and between the first bolt insertion holes 62a and 62a is the same as that of the mounting portion 60 having the structure shown in the first embodiment. The first bolt insertion holes 62a, 62a are formed shorter than the distance L1 in the front-rear direction.

The upper plate 63 is formed with an upright piece 63B at the end near the left side of the transmission case 50 among the outer peripheral ends of the flat surface portion 63A. A second bolt through which a connection bolt 64 can be screwed into an upper threaded hole 55 formed at a position higher than the lower threaded hole 54 formed in the left side surface of the transmission case 50 can be inserted into the upright piece 63B. An insertion hole 63a is formed. The second bolt insertion hole 63a and the upper screw hole 55 are formed at positions higher than the first bolt insertion hole 62a and the lower screw hole 54 by a vertical height H1.
Also, the second bolt insertion hole 63a and the upper screw hole 55 are offset from the first bolt insertion hole 62a and the lower screw hole 54 toward the center of the transmission case 50 in the horizontal direction by the width W1. .

The connecting portion 61 is located at a position facing a flat plate portion 61A facing the flat surface portion of the mounting portion 60 and the lower half side of the cylindrical exhaust gas treatment device 30, and is inclined upward so that the horizontal width increases toward the upper side. It is formed in a substantially V shape with a plate portion 61B.
The weld nut 65 provided on the flat plate portion 61A is positioned to face a long hole-shaped connecting hole 63b (see FIG. 7) provided in the flat surface portion 63A of the mounting portion 60 and having a long diameter in the left-right direction. A connection bolt 66 is inserted through the connection hole 63b from below to enable connection and disconnection.
An upper end edge 61C of the inclined plate portion 61B that expands upwards of the connecting portion 61 is welded and fixed to the lower half side of the cylindrical exhaust gas treatment device 30 .

As described above, the connecting portion 61 provided at a position facing the lower half side of the cylindrical exhaust gas treatment device 30 covers the lower half side of the cylindrical exhaust gas treatment device 30 and also treats the exhaust gas. A space S1 through which outside air can flow is formed between the outer peripheral surface of the device 30 and the outer surface of the transmission case 50 .
As a result, the flat plate portion 61A and the slanting plate portion 61B of the connecting portion 61 serve as the connecting portion 61 of the mounting support 6, and conduct radiant heat between the transmission case 50 and the exhaust gas treatment device 30. It also functions as a heat shield plate portion 67 that suppresses the heat.

[Another Embodiment 1]
In the above-described embodiment, the transmission case 50 of the transmission 5 is illustrated as a fixed portion integrated with the engine 4 to which the mounting support 6 is attached, but the present invention is not necessarily limited to this. For example, it may be the hydrostatic continuously variable transmission 51 of the transmission 5, other engine accessories, or the engine 4 itself.
Other configurations may employ configurations similar to those of the above-described embodiment.

[Another embodiment 2]
In the above-described embodiment, the mounting support 6 has a structure including the mounting portion 60 and the connecting portion 61 that can be attached to and detached from the mounting portion 60. However, the structure is not necessarily limited to this. is not. For example, the mounting portion 60 and the connecting portion 61 may be configured integrally.
Other configurations may employ configurations similar to those of the above-described embodiment.

[3 of another embodiment]
In the above embodiments, the mounting supports 6 are arranged on the fuselage frame 1, on the fuselage frame 1 on the front side of the driving section 10, and on the fuselage frame 1 on the rear side of the driving section. Although the structure used in the driving unit 3 provided between the loading platform 2 is illustrated, it is not necessarily limited to this. For example, it can be used in a place where there is no height restriction by the loading platform 2 and no restriction on the arrangement position in the front-rear direction by the driving unit 10 .
Other configurations may employ configurations similar to those of the above-described embodiment.

[Another Embodiment 4]
In the above-described embodiment, the running device has a structure including the front wheels 1F and the rear wheels 1R, but the structure is not limited to this structure. Alternatively, a crawler traveling device may be used instead of the front wheels 1F and the rear wheels 1R.
Other configurations may employ configurations similar to those of the above-described embodiment.

The present invention is not limited to utility vehicles, but can be applied to various work vehicles such as lawn mowers, trucks, and agricultural machinery.

1 body frame 1F front wheel (running device)
1R rear wheel (running device)
Reference Signs List 2 loading platform 3 driving unit 5 transmission 4 engine 6 mounting support 10 operating unit 30 exhaust gas treatment device 31 exhaust introduction pipe 45 exhaust manifold 60 mounting portion 61 connecting portion 67 heat shield portion

Claims (5)

The power unit is provided with an engine and an exhaust gas treatment device connected to the exhaust manifold of the engine,
the exhaust gas treatment device is connected to a fixed part integral with the engine via a mounting support;
The mounting support includes a mounting portion that can be connected to the fixed portion and a connecting portion that connects the exhaust gas treatment device ,
The connecting portion includes a connecting surface portion detachably connected to the mounting portion, and a connecting piece portion connected and fixed to the exhaust gas treatment device. A hot plate part is provided,
In the heat shield plate portion, the fixed portion and the exhaust gas are arranged so as to suppress conduction of radiant heat between the fixed portion and the exhaust gas treatment device in a state where the exhaust gas treatment device is attached to the mounting support. A working vehicle that shields between treatment devices and has a space that allows outside air to flow between the outer peripheral surface of the exhaust gas treatment device and the connecting surface portion . The motor unit comprises a body frame supported by a travel device, a driving section disposed on the front side of the body frame, and a loading platform disposed on the body frame on the rear side of the driving section. is provided between
The exhaust gas treatment device is arranged with its longitudinal direction along the front-rear direction,
2. The work vehicle according to claim 1, wherein the front and rear of said space are open . The engine is disposed in front of the driving unit, and the transmission is connected to the rear of the engine,
said exhaust gas treatment device being disposed above said transmission at a rearward position away from said engine;
3. The work vehicle according to claim 1, wherein said mounting support is attached to said transmission. The exhaust gas treatment device is arranged with its longitudinal direction along the front-rear direction,
a front end portion of the exhaust gas treatment device and the exhaust manifold are connected by an exhaust introduction pipe extending in the front-rear direction;
4. The lower part of the exhaust gas treatment device is supported by the mounting support in a state in which the heat shield plate faces the lower half side of the exhaust gas treatment device. work vehicle. The work vehicle according to any one of claims 1 to 4, wherein the exhaust gas treatment device is provided with a silencer.

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