JP2012003640A - Agricultural tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural tractor preventing the dimension of rear-wheel fenders from affecting the arrangement of an operation tool, while effectively using a space over the rear-wheel fenders.SOLUTION: A tractor includes rear-wheel fenders 15, a driver's seat 14, armrests 31 and a second operation tool group (60 and 61). The rear-wheel fenders 15 are disposed laterally to a driver's seat 14. The armrests 31 are disposed laterally to the driver's seat 14, a portion thereof is overhangingly disposed over the rear-wheel fenders 15, and the armrests 31 are provided with a first operation tool group (33 and 39). The second operation tool group is disposed between the rear-wheel fenders 15 and the driver's seat 14. In the side view, the second operation tool group is disposed at a position lower than the armrests 31. The front ends of the armrests 31, in the plan view, are disposed outward in a car body horizontal direction compared with the rear end.

Description

  The present invention relates to an arrangement of various operation tools provided in an agricultural tractor.

  In agricultural tractors, the operator needs to perform various types of operations such as a main speed change operation, a PTO clutch operation, and a lifting / lowering operation of a work machine. In particular, in a small tractor, since the space for arranging the operation tool is limited, various devices have been conventionally devised for the arrangement of the operation tool.

  For example, Patent Document 1 discloses an example in which various operation tools are arranged on an armrest.

JP 2005-335429 A

  However, the number of operation tools that can be arranged on the armrest is limited. Since the agricultural tractor needs to be provided with a large number of operation tools, the operation tools that could not be arranged on the armrest must be arranged at other positions. However, Patent Document 1 does not particularly describe the arrangement of operation tools other than the armrest.

  In this regard, in the conventional agricultural tractor, for example, an operation tool may be disposed on the upper surface of the rear wheel fender. In other words, since the rear wheel fender is arranged right next to the driver's seat, if the operation tool is arranged on the upper surface thereof, the operator can easily operate the operator while sitting on the driver's seat. Therefore, the space above the fender is particularly suitable as a space for arranging the operation tool.

  Here, in the case of a tractor equipped with an armrest, an operator who wants to operate the operation tool arranged on the upper surface of the rear wheel fender needs to reach out through the armrest and perform the operation. You have to change the position of the elbow and hand that you are placing. Therefore, in order to comfortably operate the operating tool on the rear wheel fender, the positional relationship between the operating tool on the rear wheel fender and the armrest is important. That is, if the position of the operating tool on the rear wheel fender is too high or too low with respect to the armrest, the position of the hand or elbow must be moved greatly, which makes it extremely difficult to perform the operation. .

  However, in an agricultural tractor, there is a situation in which the size of the fender may be varied depending on the vehicle type and the tire size. Thus, if the size of the fender is made different for each vehicle type, the height of the operation tool arranged on the upper surface of the fender will also be different for each vehicle type. Therefore, depending on the vehicle model, the positional relationship between the armrest and the operation tool on the fender may be inappropriate.

  The present invention has been made in view of the above circumstances, and its main purpose is for agricultural use in which the arrangement of the operation tool is not affected by the size of the rear wheel fender while effectively utilizing the space on the rear wheel fender. To provide a tractor.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the viewpoint of this invention, the following agricultural tractors are provided. That is, this agricultural tractor includes a rear wheel fender, a driver seat, an armrest, and a second operating tool group including at least one operating tool. The rear wheel fender is disposed on the side of the driver seat. The armrest includes a first operation tool group including at least one operation tool, and is disposed on a side of the driver seat so that at least a part of the armrest projects over the rear wheel fender. The second operating tool group is disposed between the rear wheel fender and the driver seat. The second operation tool group is disposed at a position below the armrest in a side view. And the front side edge part of the said armrest is located near the vehicle body left-right direction outer side by planar view compared with the rear side edge part.

  Thus, by arranging the armrest so as to overhang the fender, the space above the fender can be used effectively. Further, by arranging the armrest diagonally so that the front side end portion is located outside the vehicle body, a space in which the second operation tool group can be arranged between the driver seat and the rear wheel fender can be widened.

  The agricultural tractor is preferably configured as follows. That is, a grip is mounted on the rear wheel fender. The grip is disposed rearward of the front end of the armrest in plan view. Further, in plan view, a predetermined gap is formed between the side surface of the armrest on the outer side in the vehicle longitudinal direction and the grip.

  By arranging the grip on the fender in this manner, for example, when an operator twists the upper body and confirms the rear, the operator can look back without difficulty by grasping the grip and twisting the body. Further, by forming an interval between the armrest and the grip, the arm can be placed between the armrest and the grip.

  The agricultural tractor is preferably configured as follows. That is, a brake switch for operating the brake of the rear wheel is attached on the rear wheel fender. In a plan view, the brake switch is disposed at a position closer to the rear than the front end of the armrest, closer to the front than the front end of the grip, and more outward than the lateral side of the armrest in the left-right direction of the vehicle body. Yes.

  By disposing the brake switch as described above, the brake switch can be operated at hand with the arm placed between the armrest and the grip.

  In the agricultural tractor, the first operating tool group includes a vehicle speed setting operating tool for setting a traveling speed of the vehicle body, and the vehicle speed setting operating tool is disposed at a position closer to the front of the armrest. It is preferable.

  That is, the tip portion of the armrest is at a position corresponding to the hand of the operator who puts his arm on the armrest, and therefore it is preferable to arrange the speed change operation tool having the highest operation frequency.

  The agricultural tractor is preferably configured as follows. That is, the vehicle speed setting operation tool is a lever-shaped vehicle speed setting lever that rotates around a fulcrum. In plan view, at least a part of the rotation range of the vehicle speed setting lever overlaps the rear wheel fender. Further, in a side view, the lower end portion of the rotation range of the vehicle speed setting lever is below the upper end of the rear wheel fender.

  Thereby, an arm strike can be arrange | positioned so that it may be hard to touch the leg of the operator who sat on the driver's seat.

The side view of the agricultural tractor which concerns on one Embodiment of this invention. The perspective view which shows the bottom face of a tractor. The perspective view which shows the mode around a driver's seat. The top view which mainly shows the operation tool of a driver's seat side. The perspective view which shows the attachment structure of an armrest. The side view which shows the positional relationship of an armrest and a 2nd operation tool group.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a side view of an agricultural tractor 1 according to an embodiment of the present invention. The tractor 1 includes a four-wheeled vehicle body 10 having a pair of left and right front wheels 11 and a rear wheel 12.

  A bonnet 13 is disposed at the front of the vehicle body 10, and a driver seat 14 is disposed behind the bonnet 13. Further, the upper portion of the rear wheel 12 is covered with a rear wheel fender 15. The rear wheel fender 15 is positioned on the side of the driver seat 14, and the driver seat 14 is disposed so as to be sandwiched between the left and right rear wheel fenders 15. In addition, a working machine such as a tiller 20 can be connected to the rear of the vehicle body 10.

  An engine 16 is disposed inside the bonnet 13. On the other hand, below the driver's seat 14, a mission case 18 incorporating an HMT (hydraulic mechanical continuously variable transmission) or the like is disposed. The output of the engine 16 is transmitted to the transmission case 18 via a drive transmission shaft (not shown) and the like, and is appropriately shifted by the HMT. In addition, a pair of left and right chassis frames 5 provided along the longitudinal direction of the vehicle body are disposed at the lower part of the vehicle body 10. The chassis frame 5 is a member that becomes a skeleton of the vehicle body 10, and the engine 16, the transmission case 18, and the like are mounted directly or indirectly on the chassis frame 5. The appearance of the chassis frame 5 is shown in FIG. In FIG. 2, the front wheel 11 and the rear wheel 12 are omitted to better show the state of the chassis frame 5.

  A fixed space is formed between the left and right chassis frames 5, and various hoses and filters can be arranged in this space. A residue guard 19 is attached so as to cover the space where the hose and the filters are arranged from the lower side of the vehicle body 10. The residue guard 19 is a plate-like member and is disposed so as to straddle between the left and right chassis frames 5.

  That is, if the residue guard 19 is not provided, hoses and filters disposed between the chassis frames 5 are exposed below the vehicle body 10. In this way, when a field work where residues are left is performed with the hoses and filters exposed, the residues are stuck into the exposed hoses and filters, and the hoses and filters are damaged. There is a fear. Therefore, by covering the lower part of the vehicle body with the residue guard 19 and protecting the hoses and filters as described above, the hose and filters are damaged even when plowing is performed with residues remaining. Can be prevented.

  A part of the driving force of the engine 16 is transmitted to the PTO shaft 17. As shown in FIG. 1, a working machine such as the tiller 20 can be connected to the PTO shaft 17. With this configuration, a driving force can be transmitted to the cultivator 20 connected to the rear of the vehicle body 10 via the PTO shaft 17, and the cultivator 20 can be driven to perform a cultivating operation or the like.

  Next, various operation tools arranged around the driver seat 14 will be described with reference to FIGS. 3 and 4. A steering handle 30 for steering the vehicle body 10 is disposed in front of the driver seat 14. An armrest 31 is disposed on the right side of the driver seat 14. The armrest 31 is provided with a first operating tool group such as a vehicle speed setting lever 33 and a PTO switch 39.

  A left brake pedal 34 for operating the left rear wheel brake and a right brake pedal 35 for operating the right rear wheel brake are disposed at positions corresponding to the feet of the operator sitting on the driver's seat 14. Has been. For example, when the vehicle body 10 is turned rapidly, the operator depresses the brake pedal on the side corresponding to the rear wheel inside the turning direction. Thereby, since the brake can be applied to the rear wheel 12 on the inner side in the turning direction, the turning performance can be improved and a sharp turn can be performed even in a farm field with poor footing.

  A brake switch 40 is disposed on the right rear wheel fender 15. The brake switch 40 is a switch for an operator to manually operate the left and right rear wheel brakes, and is configured as a kind of toggle switch. The brake switch 40 can select one of a left position (position where the switch is tilted to the left), a neutral position, and a right position (position where the switch is tilted to the right). It is configured. When the brake switch 40 is operated to the left position, the left rear wheel 12 is braked, and when the brake switch 40 is operated to the right position, the right rear wheel 12 is braked.

  Further, a second operating tool group such as a work implement lifting lever 60 and an operation panel unit 61 is disposed between the driver seat 14 and the rear wheel fender 15. The work implement lifting / lowering lever 60 is configured so that the work implement such as the tiller 20 can be moved up and down when the operator rotates. Further, the operation panel unit 61 includes a tilling depth setting dial 62 for setting the tilling depth of the tiller 20, an inclination setting lever 63 for setting the right and left inclination angle of the tiller 20, and the like.

  Next, the configuration of the armrest 31 will be described in detail. As shown in FIG. 4, the armrest 31 is provided so as to overhang the right rear wheel fender 15. The armrest 31 is provided with operation tools (first operation tool group) such as a vehicle speed setting lever 33 and a PTO switch 39 at a portion protruding on the rear wheel fender 15. With this configuration, the operation tool can be arranged by effectively using the space above the rear wheel fender 15.

  The vehicle speed setting lever 33 is disposed at a position (near the front end of the armrest 31) where the operator can operate the hand when the arm is placed on the armrest 31. In other words, the vehicle speed setting lever 33 is an operation tool that is used frequently, and is therefore arranged at a position where the operator can operate most easily. The vehicle speed setting lever 33 is configured to be pivotable in a substantially longitudinal direction about the fulcrum. Based on the operation amount of the vehicle speed setting lever 33, the gear ratio of the HMT is changed. That is, the operator can arbitrarily set the traveling speed of the vehicle body 10 by operating the vehicle speed setting lever 33.

  Further, a PTO switch 39 is disposed on the armrest 31 at a position closer to the rear than the vehicle speed setting lever 33. The PTO switch 39 is a switch for controlling connection / disconnection of a PTO clutch (not shown) that transmits power to the PTO shaft 17. The operator can switch the cultivator 20 at the rear of the vehicle body to an operating state or a non-operating state by operating the PTO switch 39.

  Conventionally, a configuration in which an operation tool or the like is arranged on the upper surface of the rear wheel fender 15 is known. The configuration in which the operation tool is arranged on the upper surface of the rear wheel fender 15 as described above also has a common point with the armrest 31 of the present embodiment from the viewpoint of effectively using the space above the rear wheel fender 15. However, as described above, in the configuration in which the operation tool is disposed on the upper surface of the rear wheel fender 15, when the size of the rear wheel fender 15 is changed, the height of the operation tool also changes, and the operability deteriorates. There was a problem that there was.

  In this respect, the first operating tool group disposed on the armrest 31, such as the vehicle speed setting lever 33 and the PTO switch 39 included in the tractor 1 of the present embodiment, is independent of the rear wheel fender 15. The position is not changed by changing the size of the wheel fender 15. Therefore, according to the configuration of the present embodiment, the operability of the operation tool can be kept good regardless of the size of the rear wheel fender 15 while effectively using the space above the rear wheel fender 15.

  Here, in order to explain the mounting structure of the armrest 31, a state when the rear wheel fender 15 is removed is shown in FIG. As shown in FIG. 5, the armrest 31 of this embodiment is attached to a floor frame 64 on which the driver's seat 14 is supported via a support frame 65. That is, the armrest 31 is fixed by an attachment structure independent of the rear wheel fender 15 and is not connected to the rear wheel fender 15. Therefore, even when the size or the like of the rear wheel fender 15 is different, the mounting structure of the armrest 31 is not affected. Also in this respect, it can be said that the tractor 1 of the present embodiment can keep the position of the first operating tool group constant regardless of the size of the rear wheel fender 15.

  Next, the positional relationship between the armrest 31 and the second operating tool group (work implement lifting lever 60 and operation panel unit 61) will be described. As shown in a side view (FIG. 6) in which the driver seat is omitted, the second operating tool group is arranged at a position below the bottom surface of the armrest 31 in a side view. As described above, since the second operation tool group is located at a position lower than the armrest 31, for example, a layout in which the armrest is disposed immediately above the second operation tool group (in plan view, the armrest 31 overlaps the second operation tool group). Layout).

  However, if the armrest 31 overlaps the second operating tool group, the operator sitting on the driver's seat 14 cannot see the second operating tool group under the armrest 31 and the second operating tool group In order to operate, it must be operated by inserting a hand under the armrest 31, and the operability is extremely poor.

  Therefore, in order to prevent the second operating tool group and the armrest 31 from overlapping, it is conceivable to move the entire armrest 31 outward in the left-right direction of the vehicle body. However, if the armrest 31 is moved too far outward, the armrest 31 is positioned away from the body, making it difficult to place the arm and impairing comfort. Thus, in the structure provided with the armrest 31, there is a problem that it is difficult to dispose the operation tool between the driver seat 14 and the rear wheel fender 15. For this reason, in the conventional tractor, the space between the driver's seat 14 and the rear wheel fender 15 is not used much, and a configuration in which an operation tool is arranged on the upper surface of the rear wheel fender 15 is often employed. For example, in some conventional tractors, the operation panel unit 61 is disposed on the rear wheel fender 15.

  By the way, in the posture where the operator is sitting on the driver's seat 14, the tip (hand) of the arm can be moved relatively freely around the elbow. On the other hand, if the position of the elbow is far away from the body while the operator is sitting on the driver's seat 14, the posture becomes unnatural and the comfort is impaired. If this point is taken into consideration, the part of the armrest 31 where the elbow is placed cannot be arranged at a position far away from the side of the driver's seat 14, but the part of the armrest 31 where the hand is placed is away from the side of the driver's seat. It can be said that there are few problems even if it arranges in a position.

  Focusing on this point, the armrest 31 of the present embodiment, as shown in FIG. 4, has a portion where the elbow is placed (the rear end portion of the armrest 31) at a position close to the side portion of the driver seat 14. The portion (the front end of the armrest 31) is placed outward in the left-right direction of the vehicle body. That is, the armrest 31 is disposed obliquely so that the tip of the armrest 31 faces outward.

  As a result, a space is formed between the armrest 31 and the side surface of the driver seat 14 so as to expand toward the front in a plan view. That is, the space between the armrest 31 and the driver seat 14 can be increased while ensuring the comfort when the operator puts his arm on the armrest 31. And in this embodiment, the 2nd operation tool group is arrange | positioned in the space formed between the driver's seat 14 and the armrest 31 by planar view. As a result, as shown in FIG. 4, the armrest 31 can be disposed so as not to overlap the second operating tool group (work implement lifting lever 60 and operation panel unit 61) in plan view.

  Thus, since it can arrange | position so that the armrest 31 may not overlap with respect to a 2nd operation tool group, the operativity of a 2nd operation tool group can be improved. As a result, it becomes easy to arrange the operation tools at the position of the second operation tool group (between the driver seat 14 and the rear wheel fender 15). Therefore, for example, the operation panel unit 61 arranged on the upper surface of the rear wheel fender 15 in the conventional tractor can be moved between the driver seat 14 and the rear wheel fender 15 as in the present embodiment. . Thereby, the number of operation tools arranged on the upper surface of the rear wheel fender 15 can be reduced, or the operation tools on the rear wheel fender 15 can be eliminated. Thus, according to the configuration of the present embodiment, since the number of operation tools arranged on the upper surface of the rear wheel fender can be reduced, the size of the rear wheel fender 15 changes and the operability deteriorates. Is less likely to occur.

  Next, the arrangement of the armrest 31 will be further described with reference to FIGS. 4 and 6. 4 and 6, the turning range of the vehicle speed setting lever 33 is indicated by hatching. As shown in FIG. 4, a part of the rotation range of the vehicle speed setting lever 33 is arranged so as to overlap (overlap) the rear wheel fender 15 in plan view. Further, as shown in FIG. 6, the lower end portion of the rotation range of the vehicle speed setting lever 33 is located below the upper end portion of the rear wheel fender. By arranging the armrest 31 in this way, the front end portion of the armrest 31 is positioned in the space above the rear wheel fender 15. Thereby, it is possible to make it difficult for the operator's leg to hit the armrest 31.

  Next, the structure arrange | positioned on the upper surface of the rear-wheel fender 15 is demonstrated. As shown in FIG. 4, an assist grip 67 is attached to the upper surface of the rear wheel fender 15. The assist grip 67 is for gripping and twisting the upper body when an operator sitting on the driver's seat 14 confirms the rear. The assist grip 67 is disposed behind the tip of the armrest 31.

  As shown in FIG. 4, an interval is provided between the armrest 31 and the assist grip 67 so that the operator can place his / her arm. Further, as shown in FIG. 4, the brake switch 40 is disposed outside the armrest 31 in a plan view. Further, the brake switch 40 is disposed at a position behind the front end of the armrest 31 and in front of the front end of the assist grip 67 in a plan view.

  By disposing the brake switch 40 in this way, the brake switch 40 can be disposed at the operator's hand when the arm is placed between the armrest 31 and the assist grip 67. Accordingly, the brake switch 40 can be easily operated with the arm placed between the armrest 31 and the assist grip 67.

  As described above, the tractor 1 of the present embodiment includes the rear wheel fender 15, the driver seat 14, the armrest 31, and the second operating tool group. The rear wheel fender 15 is disposed on the side of the driver seat 14. The armrest 31 is on the side of the driver's seat 14 and is disposed so that a part of the armrest 31 protrudes over the rear wheel fender 15 and includes a first operating tool group. The second operating tool group is disposed between the rear wheel fender 15 and the driver seat 14. The second operating tool group is disposed at a position below the armrest 31 in a side view. And the front side edge part of the armrest 31 is located near the vehicle body left-right direction outer side in planar view compared with the rear side edge part.

  Thus, by arranging the armrest 31 so as to overhang the rear wheel fender 15, the space above the rear wheel fender 15 can be used effectively. Further, by arranging the armrest 31 obliquely so that the front side end portion is located outside the vehicle body, a space in which the first operating tool can be arranged between the driver seat 14 and the rear wheel fender 15 can be widened.

  Further, the tractor 1 of the present embodiment is configured as follows. That is, an assist grip 67 is attached on the rear wheel fender 15. The assist grip 67 is disposed rearward of the front end of the armrest 31 in plan view. Further, a predetermined interval is formed between the side surface of the armrest 31 on the outer side in the vehicle longitudinal direction and the assist grip 67 in plan view.

  By arranging the assist grip 67 on the rear wheel fender 15 in this way, for example, when the operator twists the upper body and confirms the rear, the operator grips the assist grip 67 and twists the body to look back without difficulty. be able to. Further, by forming an interval between the armrest 31 and the assist grip 67, the arm can be placed between the armrest 31 and the assist grip 67.

  Further, the tractor 1 of the present embodiment is configured as follows. That is, a brake switch 40 for operating the brake of the rear wheel is attached on the rear wheel fender 15. In a plan view, the brake switch 40 is positioned rearward of the front end of the armrest 31, forward of the front end of the assist grip 67, and outward of the end of the armrest 31 on the outer side in the left-right direction of the vehicle body. Is arranged.

  By disposing the brake switch 40 as described above, the brake switch 40 can be operated at hand with the arm placed between the armrest 31 and the assist grip 67.

  In the tractor of the present embodiment, the first operating tool group includes a vehicle speed setting lever 33 for changing the traveling speed of the vehicle body 10. The vehicle speed setting lever 33 is disposed at a position closer to the front of the armrest 31.

  That is, since the tip portion of the armrest 31 is a position corresponding to the hand of the operator who puts his arm on the armrest 31, it is preferable to arrange the vehicle speed setting lever 33 with the highest operation frequency.

  Moreover, the tractor 1 of this embodiment is configured as follows. That is, the vehicle speed setting lever 33 is a lever-like operating tool that rotates around a fulcrum. In plan view, at least a part of the rotation range of the vehicle speed setting lever overlaps the rear wheel fender 15. Further, the lower end portion of the rotation range of the vehicle speed setting lever is lower than the upper end of the rear wheel fender 15 in a side view.

  Thereby, the armrest 31 can be arrange | positioned so that it may be hard to hit the leg of the operator who sat on the driver's seat.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  The first operating tool group and the second operating tool group are not limited to the above configuration, and any operating tool may be arranged.

  The brake switch and assist grip may be omitted. Further, the position where the brake switch is arranged is not limited to the position on the rear wheel fender.

  In the description of the above embodiment, the tractor of the type in which the driver's seat is opened is described in the drawings, but the configuration of the present invention can also be applied to a tractor having a cabin.

  The transmission is not limited to the HMT, but may be, for example, a hydrostatic continuously variable transmission (HST).

1 Tractor 14 Driver's seat 15 Rear wheel fender 31 Armrest

Claims (5)

A driver seat,
A rear wheel fender disposed on a side of the driver seat;
An armrest provided on the side of the driver's seat and including a first operating tool group including at least one operating tool, the armrest being arranged so that at least a part thereof protrudes above the rear wheel fender;
A second operating tool group including at least one operating tool disposed between the rear wheel fender and the driver seat;
With
The second operating tool group is disposed at a position below the armrest in a side view,
The agricultural tractor characterized in that the front end portion of the armrest is disposed closer to the outside in the left-right direction of the vehicle body in a plan view than the rear end portion. The agricultural tractor according to claim 1,
A grip is mounted on the rear wheel fender,
The grip is disposed on the rear side of the front end of the armrest in plan view,
An agricultural tractor characterized in that a predetermined gap is formed between a side surface of the armrest on the outer side in the longitudinal direction of the vehicle body and the grip in plan view. An agricultural tractor according to claim 2,
On the rear wheel fender, a brake switch for operating the brake of the rear wheel is attached,
In a plan view, the brake switch is disposed at a position closer to the rear than the front end of the armrest, closer to the front than the front end of the grip, and more outward than the lateral side of the armrest in the lateral direction of the vehicle body. Agricultural tractor characterized by that. An agricultural tractor according to any one of claims 1 to 3,
The first operating tool group includes a vehicle speed setting operating tool for setting the traveling speed of the vehicle body,
The agricultural tractor, wherein the vehicle speed setting operation tool is disposed at a position closer to the front of the armrest. An agricultural tractor according to claim 4,
The vehicle speed setting operation tool is a lever-shaped vehicle speed setting lever that rotates around a fulcrum,
In a plan view, at least a part of the rotation range of the vehicle speed setting lever overlaps the rear wheel fender, and in a side view, the lower end portion of the rotation range of the vehicle speed setting lever corresponds to the rear wheel fender. Agricultural tractor characterized by being below the upper end.

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