JP5944263B2 - Tractor - Google Patents

Description

  The present invention relates to tractor technology.

  In addition to carbon monoxide (CO) and hydrocarbons (HC), the exhaust gas discharged from the engine contains particulate matter (PM) typified by soot. Therefore, there has been a work vehicle equipped with an exhaust purification device to remove these environmentally hazardous substances. For example, in a tractor, an exhaust purification device is disposed above an engine, and these are integrated into a bonnet (see, for example, Patent Document 1).

  By the way, an exhaust purification device for a tractor is generally composed of an oxidation catalyst carrier and a soot filter. Since the oxidation catalyst carrier is one that oxidizes carbon monoxide (CO) or hydrocarbons (HC), it becomes very hot depending on the operating state of the engine and the state of the oxidation reaction. In addition, the soot filter collects soot and oxidizes the collected soot, so it becomes very hot depending on the operating state of the engine and the state of the oxidation reaction. Therefore, the exhaust purification device dissipates heat in the bonnet, causing the temperature in the bonnet to increase.

JP 2011-106286 A

  An object of the present invention is to provide a technique for lowering the temperature in a bonnet in a tractor in which an engine and an exhaust purification device are housed in the bonnet.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In claim 1, in a tractor in which an engine and an exhaust purification device that purifies exhaust of the engine are housed in a hood, a hood that covers the exhaust purification device, and an exhaust duct that draws air from the hood, And exhausting air heated by heat radiation from the exhaust purification device to the outside of the bonnet , and the bonnet is configured to be rotatable about a rotation axis, and the hood includes the hood, It is attached to the bonnet and rotates together with the bonnet .

  In the tractor which accommodated the engine and the exhaust gas purification device which purifies exhaust of the engine in a bonnet, the hood which covers the exhaust gas purification device, the ventilation duct which sends air to the hood, The hood And an exhaust duct that allows air to escape from the exhaust, and discharges air heated by heat radiation from the exhaust purification device to the outside of the bonnet.

According to a third aspect of the present invention, in a tractor in which an engine and an exhaust purification device that purifies exhaust of the engine are housed in a bonnet, a hood that covers the exhaust purification device, and an exhaust duct that draws air from the hood, A tail pipe for discharging the air heated by heat radiation from the exhaust purification device to the outside of the bonnet, and exhausting the exhaust from the exhaust purification device, and the exhaust duct includes the tail pipe And is covered with a protective cover together with the tail pipe .

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the air heated by the heat radiation from the exhaust purification device can be discharged to the outside of the bonnet. Thereby, since the heated air does not collect inside the bonnet, the temperature inside the bonnet can be lowered. As a result, it becomes possible to prevent the bonnet from becoming hot.

A hood is attached to the hood and rotates together with the hood. Thereby, it is not necessary to remove the hood when performing maintenance, and it becomes possible to improve maintainability.

  According to the second aspect of the present invention, the air heated by the heat radiation from the exhaust purification device can be discharged to the outside of the bonnet. Thereby, since the heated air does not collect inside the bonnet, the temperature inside the bonnet can be lowered. As a result, it becomes possible to prevent the bonnet from becoming hot.

According to the third aspect of the present invention, the exhaust duct is formed along the tail pipe and covered with the protective cover together with the tail pipe. Thereby, since the protective cover for covering the tail pipe also covers the exhaust duct, the number of parts can be reduced.

The figure which shows the whole structure of a tractor. The figure which shows the engine and exhaust gas purification device which were stored in the bonnet. The figure which shows the ventilation apparatus which concerns on 1st embodiment. The figure which shows the ventilation apparatus which concerns on 2nd embodiment. The figure which shows the state which rotated the bonnet. The figure which shows the support structure of an exhaust duct. The figure which shows arrangement | positioning of the exhaust duct which concerns on other embodiment.

  First, the overall configuration of the tractor 100 will be briefly described. The technical idea of the present invention is not limited to the tractor 100 described below, and can be applied to other tractors.

  FIG. 1 is a diagram showing an overall configuration of the tractor 100. FIG. 2 is a diagram showing the engine 2 and the exhaust purification device 3 housed in the bonnet 7. 2A is a front view, and FIG. 2B is a side view.

  The tractor 100 includes a frame 1, an engine 2, an exhaust purification device 3, a transmission 4, a front axle 5, a rear axle 6, a hood 7, and a cabin 8.

  The frame 1 is a main structure of the tractor 100 and forms a skeleton of the tractor 100. An engine 2 and the like described below are attached to the frame 1.

  The engine 2 generates power by burning fuel. The engine 2 can change a driving | running state by an operator operating the accelerator pedal 81 grade | etc.,. The engine 2 in this embodiment is a diesel engine that injects fuel after compressing air.

  The exhaust purification device 3 purifies the exhaust discharged from the engine 2. The exhaust purification device 3 includes an oxidation catalyst carrier (Diesel Oxidation Catalyst: hereinafter referred to as “DOC”) 31 and a soot filter (Diesel Particulate Filter: hereinafter referred to as “DPF”) 32. The DOC 31 oxidizes carbon monoxide (CO) and hydrocarbons (HC). The DPF 32 collects soot and oxidizes the collected soot. In addition, although the exhaust purification apparatus 3 is comprised by DOC31 and DPF32, it may be comprised only in either DOC31 or DPF32.

  The transmission 4 performs forward / reverse switching and shifting of the tractor 100. The transmission 4 includes a hydraulic-mechanical continuously variable transmission (HMT or iHMT) as a transmission. However, it may be a hydrostatic continuously variable transmission (HST), but is not limited thereto.

  The front axle 5 transmits the power of the engine 2 to the tire 51. The power of the engine 2 is input to the front axle 5 via the transmission 4. The front axle 5 is provided with a steering device, and the tire 51 can be steered by operating the handle 82 by the operator.

  The rear axle 6 transmits the power of the engine 2 to the tire 61. The power of the engine 2 is input to the rear axle 6 via the transmission 4.

  The bonnet 7 is an exterior part that covers the engine 2 and the exhaust purification device 3. The bonnet 7 is configured to be rotatable in the vertical direction about the rotation shaft 7c. For this reason, the operator can easily perform maintenance of the engine 2 and the exhaust purification device 3.

  The cabin 8 is a cockpit in which various operation tools are arranged. In the cabin 8, in addition to the accelerator pedal 81 and the handle 82 described above, other operating tools used for driving the tractor 100 are arranged.

  Next, the ventilation apparatus 10A according to the first embodiment will be described.

  FIG. 3 is a diagram showing a ventilator 10A according to the first embodiment. The arrows in the figure indicate the air flow direction.

  The ventilation device 10 </ b> A includes a hood 101 and an exhaust duct 102.

  The hood 101 is formed so as to cover the exhaust purification device 3. If it demonstrates in detail, the hood 101 is formed so that the upper part of the exhaust gas purification apparatus 3 may be covered. For this reason, the hood 101 can receive the air heated by the heat radiation from the exhaust purification device 3. Further, the hood 101 can block radiation from the exhaust purification device 3. When a muffler or the like is disposed in the vicinity of the exhaust purification device 3, the hood 101 may cover the muffler or the like.

  The exhaust duct 102 has a function of drawing air from the hood 101. More specifically, the exhaust duct 102 includes a fan 102f at one end or in the middle thereof, and draws air from the hood 101 as the fan 102f rotates. Further, the exhaust duct 102 is guided to the outside of the bonnet 7 along the tail pipe 91. For this reason, the exhaust duct 102 can exhaust the air heated by the heat radiation from the exhaust purification device 3 to the outside of the hood 7. The fan 102f is driven by the power of the motor or the engine 2.

  Thus, since the tractor 100 includes the ventilation device 10 </ b> A, the air heated by the heat radiation from the exhaust purification device 3 can be discharged to the outside of the hood 7. Thereby, since the heated air does not collect inside the bonnet 7, the temperature in the bonnet 7 can be lowered. As a result, it becomes possible to prevent the bonnet 7 from becoming high temperature.

  Next, the ventilation device 10B according to the second embodiment will be described.

  FIG. 4 is a view showing a ventilator 10B according to the second embodiment. The arrows in the figure indicate the air flow direction.

  The ventilation device 10 </ b> B includes a hood 103, a blower duct 104, and an exhaust duct 105.

  The hood 103 is formed so as to cover the exhaust purification device 3. More specifically, the hood 103 is formed so as to cover the upper part of the exhaust purification device 3. For this reason, the hood 103 can receive the air heated by the heat radiation from the exhaust purification device 3. Further, the hood 103 can block radiation from the exhaust purification device 3. If a muffler or the like is disposed in the vicinity of the exhaust purification device 3, the hood 103 may cover the muffler or the like.

  The air duct 104 has a function of sending air to the hood 103. More specifically, the air duct 104 includes a fan 104f at one end or in the middle thereof, and sends air to the hood 103 when the fan 104f rotates. Further, the air duct 104 is led from the vicinity of the air intake port of the bonnet 7. However, the air duct 104 only needs to be able to send low-temperature air to the hood 103, and the position of the suction port is not limited. The fan 104f is driven by the power of the motor or the engine 2.

  The exhaust duct 105 has a function of escaping air from the hood 103. If it demonstrates in detail, since the ventilation duct 104 will send air to the hood 103, the air exhaust duct 105 will release air from the hood 103 according to the amount of sent air. Further, the exhaust duct 105 is guided to the outside of the bonnet 7 along the tail pipe 91. For this reason, the exhaust duct 105 can exhaust the air heated by the heat radiation from the exhaust purification device 3 to the outside of the hood 7. Note that a fan may be provided in the exhaust duct 105, and air may be drawn from the hood 103 as the fan rotates.

  Thus, even when the tractor 100 includes the ventilation device 10 </ b> B, the air heated by the heat radiation from the exhaust purification device 3 can be discharged to the outside of the hood 7. Thereby, since the heated air does not collect inside the bonnet 7, the temperature in the bonnet 7 can be lowered. As a result, it becomes possible to prevent the bonnet 7 from becoming high temperature.

  Next, other characteristic points of the tractor 100 will be described. In addition, although the ventilation apparatus 10A which concerns on 1st embodiment is demonstrated here, even if it is the ventilation apparatus 10B, it is applicable.

  FIG. 5 is a view showing a state in which the bonnet 7 is rotated upward.

  As described above, the bonnet 7 is configured to be rotatable in the vertical direction about the rotation shaft 7c. Since the hood 101 is attached to the back surface of the bonnet 7 via the support member 71, the hood 101 rotates together with the bonnet 7. That is, the bonnet 7 and the hood 101 rotate in an integrated state. Note that a part of the air exhaust duct 102 is a bellows part that can be expanded and contracted, and therefore cannot be removed by the rotation of the hood 7.

  In this way, the tractor 100 rotates with the hood 7 with the hood 101 attached to the hood 7. Thereby, it is not necessary to remove the hood 101 when performing maintenance, and it becomes possible to improve maintainability.

  Further, the hood 101 is attached to the hood 7 with a space S provided between the hood 101 and the hood 7. That is, a space S is provided between the hood 101 and the hood 7. For this reason, the space S becomes a heat insulating layer, and heat transfer to the bonnet 7 can be reduced. Therefore, it becomes possible to prevent the bonnet 7 from becoming high temperature. A heat insulating material may be disposed in the space S.

  FIG. 6 is a view showing a support structure for the exhaust duct 102. FIG. 6A is a side view, and FIG. 6B shows a cross-sectional view.

  As described above, the exhaust duct 102 is formed along the tail pipe 91. The exhaust duct 102 is fixed together with the tail pipe 91 by a clamp 92. The exhaust duct 102 is covered with a protective cover 93 together with the tail pipe 91.

  As described above, the tractor 100 is formed so that the exhaust duct 102 extends along the tail pipe 91 and is covered with the protective cover 93 together with the tail pipe 91. Thereby, since the protective cover 93 for covering the tail pipe 91 also covers the exhaust duct 102, the number of parts can be reduced.

  In addition, as shown in FIG. 7, the tail pipe 91 may be covered with the exhaust duct 102. That is, a double pipe structure in which the tail pipe 91 is disposed inside the exhaust duct 102 is adopted. In this case, since the air flowing through the exhaust duct 102 serves as a heat insulating layer, the exhaust duct 102 serves as a protective cover.

  In this way, the tractor 100 may cover the tail pipe 91 with the exhaust duct 102. Thereby, since the protective cover 93 for covering the tail pipe 91 is not necessary, the number of parts can be reduced.

  Further, in the case of a double pipe structure, air can be drawn from the exhaust duct 102 by the exhaust gas flowing through the tail pipe 91. For this reason, for example, even if the blowing capacity of the fan 102f is small, the air heated by the heat radiation from the exhaust purification device 3 can be discharged to the outside of the hood 7. That is, the fan 102f can be reduced in size and the cost can be reduced. In addition, the mountability can be improved by reducing the size of the fan 102f.

100 Tractor 1 Frame 2 Engine 3 Exhaust gas purification device 31 Oxidation catalyst carrier (DOC)
32 Soot filter (DPF)
4 Transmission 5 Front Axle 51 Tire 6 Rear Axle 61 Tire 7 Bonnet 71 Support Member 8 Cabin 81 Accelerator Pedal 82 Handle 91 Tail Pipe 92 Clamp 93 Protective Cover 10A Ventilator 101 Hood 102 Exhaust Duct 102f Fan 10B Ventilator 103 Hood 104 Ventilation Duct 104f Fan 105 Exhaust duct S Space

Claims (3)

In a tractor in which an engine and an exhaust purification device that purifies exhaust of the engine are housed in a bonnet,
A hood that covers the exhaust purification device, and an exhaust duct that draws air from the hood,
Exhaust air heated by heat radiation from the exhaust purification device to the outside of the bonnet ,
further,
The bonnet is configured to be rotatable about a rotation axis,
The hood is attached to the hood and rotates together with the hood.
A tractor characterized by that. In a tractor in which an engine and an exhaust purification device that purifies exhaust of the engine are housed in a bonnet,
A hood that covers the exhaust purification device, a blower duct that sends air to the hood, and an exhaust duct that escapes air from the hood,
Discharging the air heated by heat radiation from the exhaust purification device to the outside of the bonnet;
A tractor characterized by that. In a tractor in which an engine and an exhaust purification device that purifies exhaust of the engine are housed in a bonnet,
A hood that covers the exhaust purification device, and an exhaust duct that draws air from the hood,
Exhaust air heated by heat radiation from the exhaust purification device to the outside of the bonnet,
further,
Comprising a tail pipe for discharging exhaust gas from the exhaust gas purification device;
The exhaust duct is formed along the tail pipe and is covered with a protective cover together with the tail pipe.
A tractor characterized by that.

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