Tractor

Abstract

To enable an engine room to be easily opened or closed and enable easy production of an engine hood in a tractor where a first exhaust emission control device is provided above an engine and a second exhaust emission control device is provided behind the engine in the engine room.SOLUTION: An engine hood 16 has: a rear engine hood 30 which covers a rear engine room part 15B, where a second exhaust emission control device 22 is located, of an engine room 15; and a front engine hood 31 which covers a front engine room part 15F, located at the vehicle body front side relative to the rear engine room part 15B, of the engine room 15. The rear engine hood 30 and the front engine hood 31 are formed separately. The front engine hood 31 is supported in a manner that the front engine hood 31 may swing to be opened or closed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a tractor. [Background technology]

[0002] As shown in Patent Document 1, for example, some tractors are equipped with an engine bonnet (bonnet) that forms an engine compartment, a first exhaust gas purification device (first case) that is provided above the engine (diesel engine) in the engine compartment and purifies exhaust gas from the engine, and a second exhaust gas purification device (second case) that is provided behind the engine and purifies exhaust gas from the engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6188219 Summary of the Invention [Problem to be solved by the invention]

[0004] In the tractor described above, the first exhaust gas purification device is housed above the engine and the second exhaust gas purification device is housed behind the engine, so that the vertical and front-to-back lengths of the engine compartment are long and the volume of the engine compartment is large, necessitating a large engine bonnet.

[0005] To provide a tractor in which an engine compartment is easy to open and close and in which the engine bonnet is easy to manufacture, even though the engine bonnet is large. [Means for solving the problem]

[0006] The tractor according to the present invention comprises: The vehicle is equipped with an engine bonnet which forms an engine room, a first exhaust gas purification device which is provided above the engine in the engine room and which purifies exhaust gas from the engine, and a second exhaust gas purification device which is provided behind the engine and which purifies exhaust gas from the engine, and the engine bonnet has a rear bonnet which covers a rear engine room section of the engine room in which the second exhaust gas purification device is located, and a front bonnet which is constructed separately from the rear bonnet and which covers a front engine room section of the engine room which is located further forward in the vehicle body than the rear engine room section, and the front bonnet is supported in a state which allows it to swing open and closed.

[0007] According to this configuration, even if the overall size of the engine bonnet is large, the engine compartment can be opened and closed by swinging only the front bonnet, making it easy to open and close the engine compartment. The engine bonnet can be manufactured separately into the front bonnet and the rear bonnet, making it easy to manufacture the engine bonnet.

[0008] In the present invention, a bonnet support member is provided above the first exhaust gas purification device, and a pivot axis extending laterally of the vehicle body and provided at a rear end of the front bonnet is provided to the bonnet support member, Front bonnet The above It is preferable that the pivot shaft be supported so as to be capable of swinging up and down to be opened and closed, with the pivot shaft being the swing fulcrum.

[0009] According to this configuration, the front bonnet is opened by lifting the front end side of the front bonnet, and is closed by lowering the front end side of the front bonnet, making it easy to open and close the front bonnet.

[0010] In the present invention, The front bonnet has a front top plate portion and front side plate portions extending downward from the left and right side portions of the front top plate portion, and the rear bonnet has a rear top plate portion covering the rear engine room portion from above and left and right rear side plate portions covering the rear engine room portion from both lateral sides, and is provided with a connecting bolt that connects the front portion of the rear side plate portion to a support member, and it is preferable that the front bonnet is configured so that when in a closed state, the rear portion of the front side plate portion is positioned laterally outward of the connecting bolt and covers the connecting bolt.

[0011] According to this configuration, the front bonnet serves as a cover that covers the connecting bolts from the lateral outside, so that a simple cover structure that does not require a special cover can prevent the connecting bolts from getting wet.

[0012] In the present invention, The rear bonnet has a rear top plate portion that covers the rear engine room portion from above, and left and right rear side plate portions that cover the rear engine room portion from both lateral sides, and it is preferable that the rear top plate portion and the left and right rear side plate portions are configured separately.

[0013] According to this configuration, the rear bonnet can be manufactured separately into the rear top plate portion and the left and right rear side plate portions, which makes it easy to manufacture the rear bonnet.

[0014] In the present invention, The second exhaust gas purification device is configured to purify exhaust gas from the engine using a reducing agent, and it is preferable that a reducing agent tank and a reducing agent pump that supplies the reducing agent stored in the reducing agent tank to the second exhaust gas purification device are provided in the front engine room section, forward of the engine.

[0015] According to this configuration, the engine room becomes longer in length from front to rear due to the space required to accommodate the reducing agent tank and the reducing agent pump, and therefore an engine bonnet with a longer length in length from front to rear is required. However, since the engine bonnet can be manufactured separately into a front bonnet and a rear bonnet, the engine bonnet is easy to manufacture. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a left side view showing the entire tractor. [Diagram 2] FIG. 2 is a plan view showing the entire tractor. [Diagram 3] FIG. [Figure 4] FIG. 4 is a side view showing the support structure of the front bonnet and the rear bonnet. [Diagram 5] FIG. 4 is a front view showing the support structure of the rear bonnet. [Figure 6] FIG. 4 is a perspective view showing a rear bonnet, a bonnet support member, and a partition member in a disassembled state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, with regard to the tractor's running body, the direction of arrow F shown in Figures 1 and 2 is referred to as the "front of the body," the direction of arrow B is referred to as the "rear of the body," the direction of arrow U shown in Figure 1 is referred to as the "upper side of the body," the direction of arrow D is referred to as the "lower side of the body," the direction of arrow L shown in Figure 2 is referred to as the "left side of the body," and the direction of arrow R is referred to as the "right side of the body."

[0018] [Overall configuration of the tractor] As shown in Figs. 1 and 2, the tractor has a traveling body 3 supported by a pair of steerable and drivable left and right front wheels 1 and a pair of drivable left and right rear wheels 2. The body frame 4 of the traveling body 3 is composed of an engine 5, a flywheel housing 6 connected to the rear of the engine 5, a clutch housing 7 connected to the rear of the flywheel housing 6, a transmission case 7a connected to the rear of the clutch housing 7, and a front frame 8 connected to the lower part of the engine 5. A driving section 9 equipped with the engine 5 is formed at the front of the traveling body 3. A driver's seat 10 and a driver's section 12 equipped with a steering wheel 11 for steering the front wheels 1 are formed at the rear of the traveling body 3. A link mechanism 13 for connecting a work implement such as a rotary tiller (not shown) so that it can be raised and lowered, and a power take-off shaft 14 for taking power from the engine 5 and outputting it to the connected work implement are provided at the rear of the transmission case 7a. 20 shown in Figs. 1 and 2 is a lops frame. The ROPS frame 20 is configured so that its position can be changed between a lying-down storage position surrounding the driving unit 9 and an upright usage position.

[0019] [Configuration of the driving part] 1 and 3, the driving section 9 is provided with an engine room 15. The engine room 15 is formed by an engine bonnet 16 that covers the engine room 15 from above, the front, and both sides, a partition member 17 that partitions the engine room 15 from the driving section 12, and the like.

[0020] As shown in Figures 1, 2 and 3, the engine room 15 is provided with an engine 5, a radiator 18 for cooling the engine 5, a first exhaust gas purification device (DPF) 21 and a second exhaust gas purification device (SCR) 22 for purifying the exhaust gas discharged by the engine 5, a reducing agent tank 23, a reducing agent pump 24 and a battery 25.

[0021] [Radiator configuration] 1, 2, and 3, the radiator 18 is provided in front of the engine 5. Cooling air is introduced from the outside of the engine compartment 15 to the inside by the blowing action of a rotary fan 19 located between the radiator 18 and the engine 5, and is supplied to the radiator 18. The cooling air is supplied to the radiator 18 in a state in which the cooling air passes through the radiator 18 from the front to the rear. In the radiator 18, the engine cooling water is cooled by heat exchange between the supplied cooling air and the engine cooling water, and the cooled engine cooling water is supplied to the engine 5, thereby cooling the engine 5.

[0022] [Configuration of the first exhaust gas purification device and the second exhaust gas purification device] The engine 5 is a diesel engine. As shown in Figs. 2 and 3, the first exhaust gas purification device 21 is provided above the engine 5 with its longitudinal direction facing sideways to the vehicle body. A support member 26 is provided upright on the flywheel housing 6. A lower portion of the first exhaust gas purification device 21 is supported by a support arm 26a provided on the support member 26. The first exhaust gas purification device 21 is supported by the flywheel housing 6 of the vehicle body frame 4 via the support member 26. An exhaust gas suction section 21a provided at one end of the first exhaust gas purification device 21 in the vehicle body width direction is connected to an exhaust gas discharge section 5a provided on the engine 5. An exhaust gas discharge section 21b is provided at the other end of the first exhaust gas purification device 21 in the vehicle body width direction.

[0023] In the first exhaust gas purification device 21, exhaust gas discharged from the engine 5 through the exhaust gas discharge section 5a is drawn into the device by the exhaust gas suction section 21a, diesel particulates contained in the drawn exhaust gas are collected by a collection filter (not shown), and a purification process of the exhaust gas is performed to reduce the diesel particulates. The purified exhaust gas is discharged from the exhaust gas discharge section 21b.

[0024] 2 and 3, the second exhaust gas purification device 22 is provided behind the engine 5 with its longitudinal direction oriented transversely to the vehicle body. A front portion of the second exhaust gas purification device 22 is supported by a support column 26b provided on a support member 26. The second exhaust gas purification device 22 is supported by a flywheel housing 6 of the vehicle body frame 4 via the support member 26. An exhaust gas inlet 22a provided at one end of the second exhaust gas purification device 22 in the vehicle width direction is connected to an exhaust gas discharge portion 21b of the first exhaust gas purification device 21 by a connection pipe 27. An exhaust gas discharge portion 22b is provided at the other end of the second exhaust gas purification device 22 in the vehicle width direction.

[0025] In the second exhaust gas purification device 22, the exhaust gas discharged from the exhaust gas discharge portion 21b of the first exhaust gas purification device 21 is supplied to the exhaust gas introduction portion 22a by the connection pipe 27 and introduced into the device by the exhaust gas introduction portion 22a, and the introduced exhaust gas is purified by a reducing agent. In detail, urea water as a reducing agent is injected into the introduced exhaust gas and hydrolyzed, and the exhaust gas is purified by reducing the nitrogen oxide contained in the exhaust gas. The purified exhaust gas is discharged from the exhaust gas discharge portion 22b toward the outside of the vehicle body.

[0026] As shown in FIGS. 2 and 3, the reducing agent tank 23, the reducing agent pump 24, and the battery 25 are provided forward of the engine 5. In this embodiment, the reducing agent tank 23, the reducing agent pump 24, and the battery 25 are aligned in the vehicle body width direction. A support plate 28 is provided above the front frame 8. The reducing agent tank 23 is supported by the support plate 28 via a tank case 23a. The reducing agent tank 23 has a liquid injection tube 23b extending forward and upward from an upper portion of the reducing agent tank 23, and stores urea water by injecting urea water as a reducing agent from the liquid injection tube 23b. The reducing agent pump 24 extracts the urea water stored in the reducing agent tank 23 from the reducing agent tank 23, and supplies the extracted urea water to the second exhaust gas purification device 22 via a hose (not shown) extending from the reducing agent pump 24 to the second exhaust gas purification device 22.

[0027] [Engine bonnet configuration] 1, 2, and 3, the engine bonnet 16 has a rear bonnet 30 that covers the rear engine room section 15B in which the second exhaust gas purification device 22 is located in the engine room 15, and a front bonnet 31 that covers the front engine room section 15F that is located on the vehicle body front side of the rear engine room section 15B in the engine room 15. The front engine room section 15F accommodates the first exhaust gas purification device 21, the engine 5, the radiator 18, the reducing agent tank 23, the reducing agent pump 24, and the battery 25. The front bonnet 31 and the rear bonnet 30 are configured separately.

[0028] [Front bonnet configuration] As shown in Figures 1, 2, and 3, the front bonnet 31 has a front top plate portion 31a that covers the front engine room portion 15F from above, a front grill portion 31b that extends downward from the front portion of the front top plate portion 31a and covers the front engine room portion 15F from the front, and left and right front side plate portions 31c that extend downward from both side portions of the front top plate portion 31a and cover the front engine room portion 15F from both sides.

[0029] The front bonnet 31 is supported in an openable and closable state. Specifically, as shown in Figs. 2, 3, and 4, a bonnet support member 32 extending forward from an upper portion of the partition member 17 is provided at the rear of the engine room 15. As shown in Fig. 6, the bonnet support member 32 is formed by combining a plurality of steel members extending in the front-rear direction of the vehicle body and a plurality of steel members extending in the width direction of the vehicle body. As shown in Figs. 3 and 6, a pivot shaft 34 is provided extending in the width direction of the vehicle body between a connecting portion 33 provided at the rear end of the front bonnet 31 and the front portion of the bonnet support member 32. The front bonnet 31 is supported by the bonnet support member 32 in a swingable state between an upward open state in which the engine room 15 is opened, as shown by a solid line in Fig. 4, with a pivot shaft center P of the pivot shaft 34 extending in the width direction of the vehicle body as a swing fulcrum, and a downward closed state in which the engine room 15 is closed, as shown by a two-dot chain line in Fig. 4.

[0030] 3, a support member 35 extends forward from the support members 26 of the first exhaust gas purification device 21 and the second exhaust gas purification device 22 through above the engine 5. A support rod 36 that supports the bonnet support member 32 on the support member 35 is connected between an arm portion 35a provided at the front of the support member 35 and an arm portion 32a provided at the front of the bonnet support member 32. A damper 37 that urges the front bonnet 31 to an open state is connected between the arm portion 35a and the inside of the front bonnet 31.

[0031] [Rear bonnet configuration] 1, 2, and 3, the rear bonnet 30 has a rear top plate 30a that covers the rear engine room section 15B from above, and left and right rear side plate sections 30b that cover the rear engine room section 15B from both sides. As shown in Fig. 6, the rear top plate section 30a and the left and right rear side plate sections 30b are configured as separate bodies. The rear top plate section 30a and the left and right rear side plate sections 30b are configured by sheet metal members.

[0032] As shown in FIGS. 4 and 5, the rear bonnet 30 is configured to be supported by the partition member 17, a bonnet support member 32, and a side plate support member .

[0033] 4 and 5, the side plate support member 38 extends upward from both lateral sides of the flywheel housing 6. The upper end of the side plate support member 38 is connected to the front side of the bonnet support member 32, and the side plate support member 38 is configured to function as a support member for the bonnet support member 32.

[0034] As shown in Fig. 6, a connecting portion 39 is provided at each of the front and rear portions of the rear top panel portion 30a. In this embodiment, two connecting portions 39 are provided at each of the front and rear portions of the rear top panel portion 30a. As shown in Figs. 3, 4, and 5, the rear top panel portion 30a is supported by the partition member 17 and the bonnet support member 32 by the rear connecting portion 39 being pin-connected to the partition member 17 and the front connecting portion 39 being pin-connected to a support portion 32b provided at the front portion of the bonnet support member 32.

[0035] As shown in Fig. 6, in each of the left and right rear side plate portions 30b, a front connecting portion 40 is provided in a front portion of the rear side plate portion 30b, and a rear connecting portion 41 is provided in a rear portion of the rear side plate portion 30b. In this embodiment, two front connecting portions 40 and two rear connecting portions 41 are provided. As shown in Figs. 4 and 5, each of the left and right rear side plate portions 30b is supported by the side plate support member 38 and the partition member 17 by the front connecting portion 40 being connected to the side plate support member 38 by a connecting bolt 42 and the rear connecting portion 41 being connected to the partition member 17 by a pin.

[0036] 1 and the two-dot chain line in Fig. 4, in the closed state, the front bonnet 31 is configured such that a rear portion 31d of a front plate portion 31c of the front bonnet 31 is positioned laterally outward of the connecting bolt 42 and covers the connecting bolt 42. The front plate portion 31c of the front bonnet 31 prevents the connecting bolt 42 from being exposed to the outside and from getting wet.

[0037] The engine bonnet 16 has a rear bonnet 30 that covers a rear engine room section 15B in which the flywheel housing 6 is located in the engine room 15, and a front bonnet 31 that covers a front engine room section 15F that is located on the vehicle body front side of the rear engine room section 15B in the engine room 15. The front bonnet 31 and the rear bonnet 30 are configured separately. The front bonnet 31 is supported in a state in which it can be pivoted open and closed.

[0038] [Another embodiment] (1) In the above embodiment, the front bonnet 31 is supported so as to be able to swing up and down to be opened and closed around a pivot axis P provided at the rear end of the front bonnet 31 and facing laterally to the vehicle body as a swing fulcrum, but this is not limited to the above. For example, the front bonnet 31 may be supported so as to be able to swing up and down to be opened and closed around a pivot axis facing laterally to the vehicle body and located at the front end of the front bonnet 31 as a swing fulcrum, or the front bonnet 31 may be supported so as to be able to swing open and closed around a pivot axis located at a lateral portion of the front bonnet 31 in a state of extending in the fore-and-aft direction of the vehicle body as a swing fulcrum.

[0039] (2) In the above embodiment, the rear top plate 30a and the left and right rear side plate portions 30b are configured separately from each other. However, they may be configured as an integral unit.

[0040] (3) In the above embodiment, an example was shown in which the connecting bolt 42 was covered from both sides by the rear portion 31d of the front bonnet 31 in the closed state. However, this configuration does not necessarily have to be adopted.

[0041] (4) In the above embodiment, the reducing agent tank 23 and the reducing agent pump 24 are provided in front of the engine 5 in the front engine room section 15F, but this is not limited to the example. For example, the reducing agent tank 23 and the reducing agent pump 24 may be provided in any location, such as outside the engine room 15. [Industrial Applicability]

[0042] The present invention is applicable to a tractor equipped with an engine bonnet forming an engine compartment, a first exhaust gas purification device provided above the engine in the engine compartment, and a second exhaust gas purification device provided behind the engine. [Explanation of symbols]

[0043] 5 Engine 15 Engine Room 15B Rear engine compartment 15F Front engine room 16 Engine bonnet 21 First exhaust gas purification device 22 Second exhaust gas purification device 23 Reductant tank 24 Reductant pump 30 Rear bonnet 30a Rear top plate section 30b Rear plate part 31 Front bonnet 31a Front top plate section 31c Front plate 31d Rear 32 Bonnet support member 38 Support member (side plate support part) 42 Connecting bolt P Pivot axis

Claims

1. An engine bonnet forming an engine room; a first exhaust gas purification device provided above an engine in the engine compartment and purifying exhaust gas from the engine; and a second exhaust gas purification device provided behind the engine and purifying exhaust gas from the engine, the engine bonnet includes a rear bonnet covering a rear engine room portion in the engine room in which the second exhaust gas purification device is located, and a front bonnet configured separately from the rear bonnet and covering a front engine room portion in the engine room that is located on a vehicle body forward side than the rear engine room portion, The front bonnet of the tractor is supported in a state in which it can be pivoted open and closed.

2. A bonnet support member is provided above the first exhaust gas purification device, A pivot shaft provided at a rear end of the front bonnet and extending laterally of the vehicle body is provided on the bonnet support member, 2. The tractor according to claim 1, wherein the front bonnet is supported so as to be able to swing up and down to be opened and closed, with the pivot shaft as a swing fulcrum.

3. The front bonnet has a front top plate portion and front side plate portions extending downward from left and right side portions of the front top plate portion, the rear bonnet has a rear top plate portion that covers the rear engine room portion from above, and left and right rear side plate portions that cover the rear engine room portion from both lateral sides, A connecting bolt is provided to connect the front portion of the rear side plate portion to the support member, 3. The tractor according to claim 2, wherein the front bonnet is configured such that, in a closed state, a rear portion of the front side plate portion is positioned laterally outward of the connecting bolt to cover the connecting bolt.

4. the rear bonnet has a rear top plate portion that covers the rear engine room portion from above, and left and right rear side plate portions that cover the rear engine room portion from both lateral sides, The tractor according to any one of claims 1 to 3, wherein the rear top plate portion and the left and right rear side plate portions are configured separately.

5. The second exhaust gas purification device is configured to purify exhaust gas from the engine by using a reducing agent, 5. A tractor according to claim 1, further comprising: a reducing agent tank provided in front of the engine in the front engine compartment; and a reducing agent pump configured to supply the reducing agent stored in the reducing agent tank to the second exhaust gas purification device.

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