Tractor

Abstract

To provide a tractor which enables a first exhaust emission control device and a second exhaust emission control device to be provided in an engine room while lowering a height of an engine hood and setting the first exhaust emission control device and the second exhaust emission control device in a proper positional relationship advantageous to connection.SOLUTION: A first exhaust emission control device 21 is provided above an engine 5, and a second exhaust emission control device 22 is provided behind the engine 5. A support member 30 which supports the first exhaust emission control device 21 and the second exhaust emission control device 22 includes: a support pillar part 31 which extends upward from a vehicle body frame along a front part of the second exhaust emission control device 22 and supports the second exhaust emission control device 22; and a support arm part 32 which extends toward the vehicle body front from the support pillar part 31 along a lower part of the first exhaust emission control device 21 and supports the first exhaust emission control device 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] As shown in Patent Documents 1 and 2, for example, some tractors are provided with an engine bonnet (bonnet) that forms an engine compartment, and in the engine compartment, an exhaust gas purification device (exhaust gas purification treatment device) that purifies the exhaust gas discharged from the engine is provided above the engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-112284 A [Patent Document 2] JP 2015-143508 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for tractors to be equipped with multiple exhaust gas purification devices that purify exhaust gas discharged from the engine. Examples of multiple exhaust gas purification devices include an exhaust gas purification device that purifies exhaust gas using a purification filter and an exhaust gas purification device that purifies exhaust gas using a reducing agent.

[0005] When the first and second exhaust gas purification devices are installed in the engine compartment using conventional technology, the first and second exhaust gas purification devices are located above the engine, so even if the size of one of the first and second exhaust gas purification devices is smaller than the other, the installation height of the engine bonnet must be set to correspond to the larger exhaust gas purification device, resulting in a high installation height of the engine bonnet.

[0006] The present invention provides a tractor that can accommodate a first exhaust gas purification device and a second exhaust gas purification device in the engine room while keeping the mounting height of the engine bonnet low and the front-to-rear length of the engine room short, and while supporting the first exhaust gas purification device and the second exhaust gas purification device in a properly connected state on the body frame. [Means for solving the problem]

[0007] The tractor according to the present invention comprises: The vehicle is equipped with an engine bonnet forming an engine compartment, and a first exhaust gas purification device and a second exhaust gas purification device that are provided in the engine compartment and perform purification processing of exhaust gas discharged from the engine, the first exhaust gas purification device is provided above the engine with its longitudinal direction oriented laterally to the vehicle body, the second exhaust gas purification device is provided behind the engine with its longitudinal direction oriented laterally to the vehicle body, and a support member is provided that is supported by a vehicle body frame and supports the first exhaust gas purification device and the second exhaust gas purification device, and the support member extends upward from the vehicle body frame while following a front portion of the second exhaust gas purification device to support the first exhaust gas purification device and the second exhaust gas purification device. Second exhaust gas purification equipment a support portion for supporting a front portion of the first exhaust gas purification device, and a support portion for supporting the front portion of the first exhaust gas purification device. First exhaust gas purification device A support arm portion for supporting the lower portion is provided. A lower support portion is supported by a lower portion of the support column portion and supports a lower portion of the second exhaust gas purification device.

[0008] According to this configuration, the smaller first exhaust gas purification device of the first and second exhaust gas purification devices is provided above the engine, and the larger second exhaust gas purification device is provided behind the engine, and the mounting height of the engine bonnet can be set based on the size of the smaller first exhaust gas purification device. Furthermore, since the longitudinal direction of both the first and second exhaust gas purification devices faces sideways to the vehicle body, the length of the space required to accommodate the first and second exhaust gas purification devices in the longitudinal direction of the vehicle is shorter than when the longitudinal direction faces the front-rear direction of the vehicle body. Therefore, it is possible to mount the first and second exhaust gas purification devices in the engine room while keeping the mounting height of the engine bonnet low and keeping the front-rear length of the engine room short.

[0009] Since the first exhaust gas purification device and the second exhaust gas purification device are supported on the vehicle body frame with the positional relationship between them being set by the support member, it is easy to connect the first exhaust gas purification device and the second exhaust gas purification device, for example, even with a connection structure that does not have a function to enable adjustment of the positional relationship between the first exhaust gas purification device and the second exhaust gas purification device, since the first exhaust gas purification device and the second exhaust gas purification device can be connected in a positional relationship that is advantageous for connection. According to this configuration, the front part of the second exhaust gas purification device is supported on the support portion, and in addition, the lower part of the second exhaust gas purification device is supported on the support portion, so that the second exhaust gas purification device can be firmly supported on the support member.

[0010] In the present invention, It is preferable that the vehicle body frame is provided with a flywheel housing that extends rearward from a rear portion of the engine and is located below the second exhaust gas purification device, and the support portion extends upward from the flywheel housing of the vehicle body.

[0011] According to this configuration, the support pillar portion extends upward from the flywheel housing located below the second exhaust gas purification device, so that the length of the support pillar portion can be made short and the first exhaust gas purification device and the second exhaust gas purification device can be firmly supported on the vehicle frame so that they are less likely to shake.

[0012] In the present invention, It is preferable that a position adjustment portion is provided that can adjust the support position of the second exhaust gas purification device on the support portion in the vertical direction, the longitudinal direction, and the lateral direction of the vehicle body.

[0013] According to this configuration, even if there is a positional misalignment between the first and second exhaust gas purification devices in the vertical, longitudinal and width directions of the vehicle body due to manufacturing errors in the support members, the positional misalignment can be adjusted by the position adjustment unit, making it possible to connect the first and second exhaust gas purification devices even with a connection structure that does not have a function to correct the positional misalignment.This means that the connection structure can be simplified, for example, by eliminating the need to provide a special positional misalignment adjustment unit in the connection structure that connects the first and second exhaust gas purification devices.

[0014]

[0015]

[0016] In the present invention, It is preferable that a second position adjustment portion be provided that can adjust the support position of the second exhaust gas purification device on the lower support portion in the vertical direction, the longitudinal direction, and the lateral direction of the vehicle body.

[0017] According to this configuration, even if there is a positional misalignment between the first and second exhaust gas purification devices in the vertical, longitudinal and width directions of the vehicle body due to manufacturing errors in the support members, the positional misalignment can be adjusted by the second position adjustment unit, making it possible to connect the first and second exhaust gas purification devices even with a connection structure that does not have a function to correct the positional misalignment.This makes it possible to simplify the connection structure, for example by eliminating the need to provide a special positional misalignment adjustment unit in the connection structure that connects the first and second exhaust gas purification devices.

[0018] In the present invention, It is preferable that a seat portion be provided at a lower portion of the support pillar, the seat portion being connected to the body frame to support the support pillar on the body frame, and the lower support portion be provided on the seat portion.

[0019] According to this configuration, the seat portion serves as a connecting member for supporting the lower support portion on the support column, so that the structure for mounting the lower support portion on the support column can be simplified without requiring any special connecting member. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a left side view showing the entire tractor. [Diagram 2] FIG. 2 is a left side view showing the first exhaust gas purification device and the second exhaust gas purification device. [Diagram 3] FIG. 2 is a plan view showing a first exhaust gas purification device and a second exhaust gas purification device. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view of the support member in an exploded state. [Figure 6] FIG. 4 is a right side view showing the left and right brake operation devices. [Figure 7] FIG. 4 is an explanatory diagram showing an assembly method of the brake pedal. [Figure 8] FIG. 4 is a rear view showing the steering post cover and the panel cover. [Figure 9] FIG. 11 is a rear view showing a panel cover according to another embodiment. [Figure 10] FIG. 13 is a perspective view of a steering post cover according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] 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 Figure 1 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 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 toward the front of the page is referred to as the "left side of the body," and the direction toward the back of the page is referred to as the "right side of the body."

[0022] [Overall configuration of the tractor] As shown in FIG. 1, 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 FIG. 1 is a lops frame.

[0023] [Configuration of the driving part] 1 and 2, 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 and from the front, a partition member 17 that partitions the engine room 15 from the driving section 12, and the like.

[0024] As shown in Figures 1 and 2, 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 for purifying the exhaust gas discharged by the engine 5, and a second exhaust gas purification device (SCR) 22.

[0025] [Radiator configuration] As shown in Fig. 1, 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 coolant is cooled by heat exchange between the supplied cooling air and the engine coolant, and the cooled engine coolant is supplied to the engine 5, thereby cooling the engine 5.

[0026] [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 the vehicle body. The maximum length H of the first exhaust gas purification device 21 in the vertical direction of the vehicle body is shorter than the maximum length W of the first exhaust gas purification device 21 in the front-rear direction of the vehicle body. As shown in Figs. 2 and 3, 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. In this embodiment, the exhaust gas suction section 21a is provided to protrude downward from the lower part of the first exhaust gas purification device 21 at the end of the first exhaust gas purification device 21 on the left side of the vehicle body, and the exhaust gas discharge section 21b is provided to protrude rearward from the end of the first exhaust gas purification device 21 on the right side of the vehicle body.

[0027] 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.

[0028] 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. An exhaust gas inlet 22a provided at one end of the second exhaust gas purification device 22 in the vehicle body width direction is connected to an exhaust gas discharge portion 21b of the first exhaust gas purification device 21 by a connection pipe 23. An exhaust gas discharge portion 22b is provided at the other end of the second exhaust gas purification device 22 in the vehicle body width direction. In this embodiment, the exhaust gas inlet 22a is provided at an end of the second exhaust gas purification device 22 on the left side of the vehicle body, and the exhaust gas discharge portion 22b is provided at an end of the second exhaust gas purification device 22 on the right side of the vehicle body.

[0029] In the second exhaust gas purification device 22, the exhaust gas discharged from the first exhaust gas purification device 21 through the exhaust gas discharge portion 21b is supplied to the exhaust gas introduction portion 22a through the connection pipe 23 and introduced into the device through the exhaust gas introduction portion 22a, where the introduced exhaust gas is purified by a reducing agent. More specifically, urea water as a reducing agent is injected into the introduced exhaust gas and hydrolyzed, thereby purifying the exhaust gas by reducing the nitrogen oxides 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.

[0030] As shown in Fig. 3, the first exhaust gas purification device 21 is supported in an installation position in which the portion at the other end in the vehicle width direction is swung toward the vehicle body front side with respect to the portion at one end in the vehicle width direction with the exhaust gas suction part 21a as the swing center. That is, the first exhaust gas purification device 21 is supported in a position in which the longitudinal direction is inclined with respect to the vehicle width direction in a plan view. As shown in Fig. 2, the exhaust gas introduction part 22a of the second exhaust gas purification device 22 extends obliquely upward and rearward from the second exhaust gas purification device 22. While the first exhaust gas purification device 21 and the second exhaust gas purification device 22 are moved closer together in the fore-and-aft direction of the vehicle body and while the exhaust gas suction section 21a of the first exhaust gas purification device 21 is directly connected to the exhaust gas discharge section 5a of the engine 5, the positional relationship between the exhaust gas discharge section 21b of the first exhaust gas purification device 21 and the exhaust gas inlet section 22a of the second exhaust gas purification device 22 can be made appropriate for the adoption of a connecting pipe 23 that does not have an adjustment means such as a bellows for adjusting the positional relationship between the exhaust gas discharge section 21b and the exhaust gas inlet section 22a.

[0031] 2 and 3, a rear portion 21c of the first exhaust gas purification device 21 is located further rearward in the vehicle body than the rear end portion of the engine 5. In a plan view, the rear portion 21c of the first exhaust gas purification device 21 and the second exhaust gas purification device 22 overlap each other.

[0032] As shown in Figs. 2 and 3, a partition member 17 is provided between the rear of the second exhaust gas purification device 22 and the lower part of the second exhaust gas purification device 22, partitioning the engine room 15 from the driver's section 12. The partition member 17 is configured such that a portion 17a of the partition member 17 located below the second exhaust gas purification device 22 is located further forward in the vehicle body than a portion 17b of the partition member 17 located behind the second exhaust gas purification device 22. The portion 17a of the partition member 17 located below the second exhaust gas purification device 22 is provided with an inclined portion that is located closer to the front of the vehicle body as it approaches the lower end. The foot space of the driver's section 12 can be extended below the second exhaust gas purification device 22.

[0033] As shown in FIG. 6, an electric wire 24 is provided between the engine room 15 and the driver's section 12. In this embodiment, a plurality of electric wires 24 are provided, but only one may be provided. The electric wire 24 passes under a portion of the partition member 17 located at the center of the vehicle width direction from the engine room 15 into the foot space of the driver's section 12. The electric wire 24 transmits information about the operation of the engine 5 to the instruments of the driver's section 12. A portion of the electric wire 24 located on the driver's section side with respect to the partition member 17 is wired in a state where it is aligned with a portion 17a of the partition member 17 located below the second exhaust gas purification device 22 in the foot space of the driver's section 12. The electric wire 24 passes through the inside of a wiring tube 25. The wiring tube 25 is supported by the partition member 17 by a clamp 26.

[0034] [Support member for exhaust gas purification device] 2, 3, and 4, the first exhaust gas purification device 21 and the second exhaust gas purification device 22 are supported on the vehicle body frame 4 via a support member 30. The first exhaust gas purification device 21 and the second exhaust gas purification device 22 are supported on the vehicle body frame 4 in a state in which the positional relationship between the exhaust gas discharge portion 21b of the first exhaust gas purification device 21 and the exhaust gas introduction portion 22a of the second exhaust gas purification device 22 is set by the support member 30.

[0035] As shown in Figures 2, 3, 4 and 5, the support member 30 is provided with a support pillar portion 31 which extends upward from the vehicle frame 4 along the front portion 22c of the second exhaust gas purification device 22 and supports the front portion 22c of the second exhaust gas purification device 22, a support arm portion 32 which extends forward of the vehicle from an upper portion of the support pillar portion 31 along the lower portion 21d of the first exhaust gas purification device 21 and supports the lower portion 21d of the first exhaust gas purification device 21, and a lower support portion 33 which is provided at the lower portion of the support pillar portion 31 and supports the lower portion 22d of the second exhaust gas purification device 22.

[0036] 2, 4 and 5, the support pillar 31 has a seat 34 provided at the lower part of the support pillar 31, and is supported by the body frame 4 by being connected to the body frame 4. The seat 34 is connected to the body frame 4 by a flywheel housing 6 which constitutes the body frame 4. The flywheel housing 6 is located below the second exhaust gas purification device 22, and this allows the length of the support pillar 31 to be short.

[0037] 2, 4, and 5, the support column 31 is provided with left and right support rods 31a spaced apart in the width direction of the vehicle body. A lower support rod reinforcing rod 31b that connects the lower parts of the support rods 31a and an upper support rod reinforcing rod 31c that connects the upper parts of the support rods 31a are provided between the left and right support rods 31a. The left and right support rods 31a are made of steel pipes.

[0038] 2, 4, and 5, each of the left and right support rods 31a is provided with a front support portion 31d that supports the second exhaust gas purification device 22. Front connecting portions 22e provided at two positions, left and right, on the front portion 22c of the second exhaust gas purification device 22 are connected to the front support portions 31d, so that the front portion 22c of the second exhaust gas purification device 22 is supported by the support portions 31.

[0039] 2, 4, and 5, the seat portion 34 has seat plate portions 34a provided at the lower portions of the left and right support rods 31a. The left and right seat plate portions 34a of the seat portion 34 are connected to the flywheel housing 6 by a plurality of connecting bolts, so that the seat portion 34 is detachably connected to the flywheel housing 6.

[0040] 2, 4, and 5, the lower support portion 33 is provided with lower support pieces 33a provided on the lower parts of the left and right support rods 31a. The left and right lower support pieces 33a are provided on the support rods 31a by being formed on the seat plate portion 34a. The lower support portion 33 is provided on the seat portion 34. The lower portion 22d of the second exhaust gas purification device 22 is supported by the lower support portion 33 by connecting lower connecting portions 22f provided at two locations, left and right, on the lower portion 22d of the second exhaust gas purification device 22 to the lower support pieces 33a.

[0041] 2, 4, and 5, the support arm portion 32 is provided with arm bodies 32a extending forward from the upper portions of the left and right support rods 31a. An arm reinforcing rod 32b is provided across the tips of the left and right arm bodies 32a to connect the left and right arm bodies 32a. Of the left and right arm bodies 32a, the left arm body 32a is configured to be connected to a lower connecting portion 21e provided on the lower portion 21d of the first exhaust gas purification device 21 via a relay member 32c. The right arm body 32a is configured to be directly connected to the lower connecting portion 21e of the first exhaust gas purification device 21.

[0042] [Configuration for adjusting the position of the exhaust gas purification device] As shown in Figures 2, 4 and 5, the support member 30 is provided with a position adjustment section 35 that can adjust the support position of the second exhaust gas purification device 22 at the support section 31 in the vertical direction, the fore-aft direction and the width direction of the vehicle body, and a second position adjustment section 37 that can adjust the support position of the second exhaust gas purification device 22 at the lower support section 33 in the vertical direction, the fore-aft direction and the width direction of the vehicle body.

[0043] If there is a positional misalignment between the exhaust gas discharge portion 21b of the first exhaust gas purification device 21 and the exhaust gas inlet portion 22a of the second exhaust gas purification device 22, the positional relationship between the exhaust gas discharge portion 21b and the exhaust gas inlet portion 22a can be adjusted by the position adjustment portion 35 and the second position adjustment portion 37 so that the positional relationship between the exhaust gas discharge portion 21b and the exhaust gas inlet portion 22a becomes appropriate and the exhaust gas discharge portion 21b and the exhaust gas inlet portion 22a can be appropriately connected by the connecting pipe 23 that does not have a position adjustment function.

[0044] Specifically, as shown in Figures 2, 4 and 5, the position adjustment section 35 is provided with an adjustment member 36 located between the front connecting portion 22e of the second exhaust gas purification device 22 and the front support portion 31d of the support portion 31, a first connecting bolt 36a connecting the front connecting portion 22e and the adjustment member 36, and a second connecting bolt 36b connecting the front support portion 31d and the adjustment member 36.

[0045] As shown in Figures 2, 4 and 5, the second position adjustment part 37 is provided with a second adjustment member 38 located between the lower connecting part 22f of the second exhaust gas purification device 22 and the lower support piece 33a of the support part 31, a third connecting bolt 38a connecting the lower connecting part 22f and the second adjustment member 38, and a fourth connecting bolt 38b connecting the lower support piece 33a and the second adjustment member 38.

[0046] The diameter of a through hole (not shown) of the adjustment member 36 through which the first connecting bolt 36a is inserted is made larger than the outer diameter of the first connecting bolt 36a, allowing the front connecting portion 22e to be displaced relative to the adjustment member 36. The diameter of a through hole (not shown) of the adjustment member 36 through which the second connecting bolt 36b is inserted is made larger than the outer diameter of the second connecting bolt 36b, allowing the adjustment member 36 to be displaced relative to the front support portion 31d.

[0047] The diameter of a through hole (not shown) of the second adjustment member 38 through which the third connecting bolt 38a is inserted is made larger than the outer diameter of the third connecting bolt 38a, allowing the adjustment member 36 to be displaced relative to the front support portion 31d. The diameter of a through hole (not shown) of the second adjustment member 38 through which the fourth connecting bolt 38b is inserted is made larger than the outer diameter of the fourth connecting bolt 38b, allowing the adjustment member 36 to be displaced relative to the front support portion 31d.

[0048] In the position adjustment section 35, the tightening of the connecting bolts corresponding to the desired position adjustment among the first connecting bolt 36a, the second connecting bolt 36b, the third connecting bolt 38a, and the fourth connecting bolt 38b is released, and the second exhaust gas purification device 22 is moved, whereby the second exhaust gas purification device 22 is shifted in position relative to the support member 30, and the support position of the second exhaust gas purification device 22 on the support section 31 is changed in the vertical direction, the longitudinal direction, and the lateral direction of the vehicle body corresponding to the movement operation of the second exhaust gas purification device 22 that has been performed.

[0049] In the second position adjustment section 37, the tightening of the connecting bolts corresponding to the desired position adjustment among the first connecting bolt 36a, the second connecting bolt 36b, the third connecting bolt 38a, and the fourth connecting bolt 38b is released, and the second exhaust gas purification device 22 is moved, whereby the second exhaust gas purification device 22 is shifted in position relative to the support member 30, and the support position of the second exhaust gas purification device 22 on the lower support section 33 is changed in the vertical direction, the longitudinal direction, and the lateral direction of the vehicle body corresponding to the movement operation of the second exhaust gas purification device 22 that has been performed.

[0050] [Drive section configuration] As shown in Fig. 1, the driver's section 12 is provided behind the engine compartment 15. As shown in Figs. 1, 3 and 8, the driver's section 12 is provided with a driver's seat 10, a steering wheel 11 for steering the front wheels 1, a left brake operation section 40L for operating a brake for the left rear wheel (not shown), and a right brake operation section 40R for operating a brake for the right rear wheel (not shown).

[0051] [Configuration of left and right brake operation units] As shown in Fig. 8, the left brake operation unit 40L and the right brake operation unit 40R are provided on the lower right side of the steering wheel 11. As shown in Figs. 3, 6 and 8, each of the left brake operation unit 40L and the right brake operation unit 40R includes a brake pedal 41, a return spring 42 that returns the brake pedal 41 to the brake-off position [OFF], and a master cylinder 43 connected to the brake pedal 41.

[0052] As shown in Fig. 6, the brake pedal 41 is provided with a pedal arm portion 41a and a foot plate portion 41b provided at the lower end portion of the pedal arm portion 41a. A support shaft 44 is provided at the upper portion of the pedal arm portion 41a. The support shaft 44 is supported by a support portion 45 provided on the traveling vehicle body 3. The brake pedal 41 is supported by the traveling vehicle body 3 in a state in which it can swing between a brake off position [OFF] and a brake on position [ON] with the axis P of the support shaft 44 as a swing fulcrum. The brake pedal 41 is positioned at the brake off position [OFF] by the pedal arm portion 41a abutting against a stopper 47.

[0053] As shown in Fig. 6, a partition member 17 that separates the engine compartment 15 from the driver's section 12 is provided on the vehicle body forward of the brake pedal 41. The return spring 42 is engaged with a pedal arm portion 41a and a spring support portion 17d provided on the partition member 17. The return spring 42 biases the brake pedal 41 to swing to the brake-off position [OFF], using the partition member 17 as a reaction member.

[0054] 6, the partition member 17 is configured such that a portion 17a of the partition member 17 corresponding to the footboard portion 41b is located further forward in the vehicle body than a portion 17b of the partition member 17 corresponding to the support shaft 44. The front portion of the foot space of the driver's section 12 can be extended forward of the support shaft 44.

[0055] 6, the master cylinder 43 is provided on the rear side of the vehicle body relative to the support shaft 44 of the brake pedal 41. The master cylinder 43 is detachably fixed to a support part 45. A slidable operating shaft 43a of the master cylinder 43 and an operating arm part 41c provided on the brake pedal 41 are interlockingly connected. The operating arm part 41c extends from the pedal arm part 41a toward the side opposite to the side where the footboard part 41b is located with respect to the support shaft 44.

[0056] In each of the left brake operating unit 40L and the right brake operating unit 40R, when the brake pedal 41 is depressed against the return spring 42 to the brake-on position [ON], the operating shaft 43a of the master cylinder 43 is slid toward the push-in side by the operating arm portion 41c, and the master cylinder 43 supplies operating hydraulic pressure to the brake (not shown) to switch the brake to the ON state. When the brake pedal 41 is released, the brake pedal 41 is returned to the brake-off position [OFF] by the return spring 42, and the operating shaft 43a of the master cylinder 43 is slid toward the pull-out side by the operating arm portion 41c, the application of operating hydraulic pressure to the brake by the master cylinder 43 is released, and the brake is switched to the brake-off state.

[0057] [Configuration of return spring] 3 and 6, the return spring 42 is formed of a torsion coil spring and includes a coil portion 42a, an arm portion 42b extending from one end of the coil portion 42a, and an arm portion 42c extending from the other end of the coil portion 42a. The coil portion 42a is fitted onto a support shaft 44, and the return spring 42 is supported by the support shaft 44. The arm portion 42b on one end side is engaged with the spring support portion 17d of the partition member 17. The arm portion 42c on the other end side is engaged with the pedal arm portion 41a.

[0058] 6, the arm portion 42c on the other end side is provided with a bent end portion 42d that engages with the pedal arm portion 41a. The pedal arm portion 41a is provided with a through hole 46 into which the bent end portion 42d engages. The through hole 46 is shaped so that the bent end portion 42d that moves along the axis P of the support shaft 44 can be inserted. The return spring 42 and the brake pedal 41 can be assembled in the following manner.

[0059] As shown in FIG. 7, the coil portion 42a of the return spring 42 is fitted onto the support shaft 44, and the arm portion 42b on one end side is engaged with the partition member 17. The return spring 42 is in a free state. The stopper 47 is removed from the support portion 45, and the brake pedal 41 is attached to the support shaft 44 and swung upward to operate the brake pedal 41 in a position relative to the support shaft in which the foot plate portion 41b is positioned higher than when the brake pedal 41 is in the brake-off position [OFF]. The brake pedal 41 in this position relative to the support shaft is guided by the support shaft 44 and moved toward the return spring 42. As the brake pedal 41 moves, the bent end portion 42d of the return spring 42 moves toward the pedal arm portion 41a in a direction along the axis P of the support shaft 44, and moves from the inside of the pedal arm portion 41a to the outside of the pedal arm portion 41a through the through hole 46. Next, the brake pedal 41 is swung downward. At this time, the operating arm portion 41c enters into the slit 17e provided in the partition member 17. The stopper 47 is attached to the support portion 45 to set the brake pedal 41 to the brake-off position [OFF]. Then, the brake pedal 41 is received by the stopper 47, the bent end portion 42d is engaged with the pedal arm portion 41a as shown in Fig. 6, and the return spring 42 has an elastic restoring force such that the brake pedal 41 is urged to swing to the brake-off position [OFF] by the return spring 42. The slit 17e is closed after the assembly of the brake pedal 41 is completed.

[0060] [Structure of steering post cover and panel cover] The steering wheel 11 is supported in a state in which its position can be changed in the front-rear and up-down directions. As shown in Fig. 8, the steering post cover 50 is inserted through a through hole 52 of a panel cover 51 supported by the traveling vehicle body 3. When the position of the steering wheel 11 is changed in the front-rear direction, the steering post cover 50 swings in the front-rear direction relative to the panel cover 51 following the steering wheel 11. A bellows-shaped telescopic cover 53 is connected between the front lower part of the steering post cover 50 and the lower part 51a of the panel cover 51. The telescopic cover 53 expands and contracts as the steering post cover 50 swings, and keeps the gap between the steering post cover 50 and the lower part 51a of the panel cover 51 closed regardless of the swing of the steering post cover 50. A gap is provided between the rear wall of steering post cover 50 and a portion of panel cover 51 facing the rear wall of steering post cover 50 to allow steering post cover 50 to swing, but above the gap, the rear wall of steering post cover 50 is provided with a bulge that bulges outward toward the outside of the cover to make the gap less visible from above. Of panel cover 51, surface portion 51b corresponding to the side of steering post cover 50 is raised toward the front. Even if steering post cover 50 swings, the gap between steering post cover 50 and panel cover 51 on the side of steering post cover 50 is less visible due to surface portion 51b.

[0061] [Another embodiment] (1) Fig. 9 is a rear view of a panel cover 55 according to another embodiment. Fig. 10 is a perspective view of a steering post cover 56 according to another embodiment. In the panel cover 55 according to another embodiment, an opening 58 and a front wall 59 extending upward from the lower edge of the opening 58 are provided below the through hole 57 through which the steering post cover 56 is inserted. In the steering post cover 56, a front extension 61 extending downward from the lower end 60a of the lateral wall 60 is provided at the front lower part, and a rear extension 62 extending downward from the lower end 60a of the lateral wall 60 is provided at the rear lower part. The front wall 59, the front extension 61, and the rear extension 62 function as a concealing wall that makes it difficult to see inside the panel cover 55 below through a gap formed between the steering post cover 56 and the panel cover 55 on the front side and the side of the steering post cover 56.

[0062] (2) In the above embodiment, the support pillar 31 extends from the flywheel housing 6. However, the present invention is not limited to this. The support pillar 31 may extend from any portion of the body frame 4.

[0063] (3) In the above embodiment, an example was shown in which the position adjustment unit 35 was provided, but the position adjustment unit 35 may not be provided.

[0064] (4) In the above embodiment, an example was shown in which the lower support portion 33 and the second position adjustment portion 37 were provided, but the lower support portion 33 may not be provided. Also, even if the lower support portion 33 is provided, the second position adjustment portion 37 may not be provided.

[0065] (5) In the above embodiment, an example was shown in which the lower support portion 33 was provided on the seat portion 34, but the lower support portion 33 may not be provided on the seat portion 34 and may be provided directly on the support portion 31. [Industrial Applicability]

[0066] The present invention can be applied to a tractor provided with an engine bonnet that forms an engine compartment. [Explanation of symbols]

[0067] 4 Body frame 5 Engine 6 Flywheel housing 15 Engine Room 16 Engine bonnet 21 First exhaust gas purification device 21d Lower 22 Second exhaust gas purification device 22c front 22d Lower 30 Support member 31 Pillar section 32 Support arm part 33 Lower support part 34 Seat area 35 Position adjustment part 37 Second position adjustment section

Claims

1. An engine bonnet forming an engine room; a first exhaust gas purification device and a second exhaust gas purification device are provided in the engine compartment and perform purification processing of exhaust gas discharged from the engine; the first exhaust gas purification device is provided above the engine with its longitudinal direction oriented laterally to the vehicle body, the second exhaust gas purification device is provided behind the engine with its longitudinal direction oriented laterally to the vehicle body, a support member that is supported by a vehicle body frame and supports the first exhaust gas purification device and the second exhaust gas purification device; the support member is provided with a support column portion extending upward from the vehicle frame along a front portion of the second exhaust gas purification device to support the front portion of the second exhaust gas purification device, and a support arm portion extending forward of the vehicle body from an upper portion of the support column portion along a lower portion of the first exhaust gas purification device to support a lower portion of the first exhaust gas purification device, A tractor including a lower support portion supported by a lower portion of the support column and supporting a lower portion of the second exhaust gas purification device.

2. a flywheel housing extending rearward from a rear portion of the engine and positioned below the second exhaust gas purification device is provided on the vehicle body frame; 2. The tractor according to claim 1, wherein the support portion extends upward from the flywheel housing.

3. 3. The tractor according to claim 1, further comprising a position adjustment section that adjusts a support position of the second exhaust gas purification device on the support column in the vertical direction, the longitudinal direction and the lateral direction of the vehicle body.

4. 4. A tractor according to claim 1, further comprising a second position adjustment unit that adjusts a support position of the second exhaust gas purification device on the lower support unit in the vertical direction, the longitudinal direction, and the lateral direction of the vehicle body.

5. a seat portion is provided at a lower portion of the support column, the seat portion being connected to the vehicle body frame to support the support column on the vehicle body frame; The tractor according to any one of claims 1 to 4, wherein the lower support portion is provided on the seat portion.

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