JP5658019B2 - Farm tractor - Google Patents

Description

The present invention relates to a tractor used for farming.

  2. Description of the Related Art Conventionally, in work vehicles such as tractors, techniques for supporting a driver's seat in proximity to the upper surface of a transmission case equipped with rear wheels are known (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). ). Further, a technique for supporting a driver's seat on a box-shaped mounting base is also known (see, for example, Patent Document 4).

JP 2008-63969 A JP 11-560008 A JP 2006-62572 A JP-A-6-336129

  As in Patent Documents 1 to 3, in the structure in which the driver seat is supported on the upper surface side of the mission case, for example, it is necessary to secure the ground height of the driver seat by forming the ground surface on the upper surface of the mission case high. is there. Moreover, in the structure which supports a driver's seat so that it is spaced apart with respect to the upper surface of a mission case like patent document 4, it is necessary to support a driver's seat via a mount on the floor board surface on which an operator boards. That is, there is a problem that the layout of the driver seat or the mission case and the accessory parts around them is limited, and the attachment / detachment workability of the accessory parts arranged around the driver seat or the mission case cannot be improved.

Accordingly, the present invention seeks to provide an agricultural tractor that has been improved by examining these current conditions.

The invention of claim 1 includes a traveling machine body (2) having an engine (5) and a transmission case (17), and a driver seat (8) via a seat frame (20) above the transmission case (17). In the agricultural tractor in which a work machine is installed on the traveling machine body (2), the seat frame (20) includes bottom frames (41) to (44), vertical frames (45) to (48), and an upper surface. a frame (49) - (52), said bottom frame (41) to (44) and the longitudinal frame (45) to (48) and said top frame (49) - (52) rectangular parallelepiped frame structure so as to be connected, the transmission case (17) a bottom frame (41) around the upper surface of the signed (42), to supporting the seat frame (20) to said transmission case (17), The fuel tank (62) is placed on the upper surface of the transmission case (17), and the fuel tank (62) does not protrude above the upper frame (49) to (52). The fuel tank (62) is positioned in a rectangular space inside .

According to the first aspect of the present invention, a traveling machine body (2) having an engine (5) and a transmission case (17) is provided, and a driver's seat (8) is disposed above the transmission case (17) via a seat frame (20). ), And in the agricultural tractor in which the work machine is installed on the traveling machine body (2), the seat frame (20) includes bottom frames (41) to (44) and vertical frames (45) to (48) and has an upper surface frame (49) - (52), said bottom surface frame (41) to (44) and the longitudinal frame (45) to (48) and the top frame (49) to rectangular (52) a frame structure linked so that, the transmission case (17) a bottom frame (41) around the upper surface of the signed (42), supporting the seat frame (20) to said transmission case (17) The fuel tank (62) is placed on the upper surface of the transmission case (17), and the fuel tank (62) does not protrude above the upper frame (49) to (52). (20) Since the fuel tank (62) is positioned in the rectangular space inside, the ground height on the upper surface of the mission case is made low while securing the ground height at the driver seat support position. it can. Further, the layout of the driver seat or the transmission case and the peripheral parts attached to them is almost not limited, and the auxiliary parts can be assembled in a distributed manner around the driver seat or the mission case. The attachment / detachment workability of the accessory parts arranged around the driver seat or the mission case can be improved.

According to the present invention, if the lifting hydraulic valve mechanism for the working machine is supported on one side surface of the seat frame, the detachability workability of the lifting hydraulic valve mechanism can be improved. In addition, it is not necessary to secure a place for installing the elevating hydraulic valve mechanism in the transmission case, the transmission case can be formed in a simple appearance, and the transmission case can be manufactured at low cost.

According to the present invention, if the hydraulic relief valve mechanism for the working machine is supported on the other side surface of the seat frame, the detachability of the hydraulic relief valve mechanism can be improved. Further, it is not necessary to secure an installation place of the hydraulic relief valve mechanism in the transmission case, the transmission case can be formed in a simple appearance, and the transmission case can be manufactured at low cost.

According to the present invention, a fuel tank is placed on the upper surface of the transmission case, and the fuel tank is positioned in a rectangular space in the seat frame, so that it is formed between the transmission case and the driver seat. The fuel tank can be assembled in a compact manner by effectively utilizing the space to be used. Further, the fuel tank can be surrounded and protected by the transmission case, the driver's seat and the seat frame.

It is a side view of the agricultural tractor as a work vehicle which shows a 1st embodiment. It is the same top view. It is a left view of a mission case part. It is the same right view. It is the same top view. It is the same front view. It is a left perspective view of a seat frame part. FIG. It is the same rear perspective view.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, drawings when an embodiment of the present invention is applied to a farm tractor as a work vehicle will be described. 1 is a side view of the tractor, FIG. 2 is a plan view of the same, FIG. 3 is a left side view of the mission case portion, FIG. 4 is a right side view of the same, FIG. 5 is a plan view of the same, FIG. FIG. 8 is a left perspective view of the seat frame portion, FIG. 8 is a right perspective view thereof, and FIG. 9 is a rear perspective view thereof. In the following description, the left side in the forward direction of the aircraft is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side.

  As shown in FIGS. 1 and 2, a tractor 1 as a work vehicle supports a traveling machine body 2 with a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 and is mounted on a front portion of the traveling machine body 2. By driving the rear wheel 4 and the front wheel 3 with the engine 5, the vehicle 5 is configured to travel forward and backward. The engine 5 is covered with a bonnet 6. Further, a step 7 is installed on the upper surface of the traveling body 2, and a driver seat 8 and a steering handle 9 that moves the front wheel 3 to the left and right by steering are installed on the rear side of the bonnet 6. Is done. A lops frame 10 that protects the operator is provided on the outer side of the driver seat 8.

  The traveling machine body 2 includes a left and right machine body frame 16 having a front bumper frame 12 and a front axle case 13. A mission case 17 is connected to the rear portion of the body frame 16 for transmitting the rotation of the engine 5 to the rear wheels 4 and the front wheels 3 with appropriate speed change. In this case, the rear wheel 4 is attached to the transmission case 17 via a rear axle case 18 mounted so as to protrude outward from the outer surface of the transmission case 17.

  A seat frame 20 is attached to the upper surface of the transmission case 17 by bolt fastening. A link mechanism 23 having a lower link 21 and a top link 22 is provided. A link mechanism 23 is provided at the rear part of the transmission case 17, and a working machine (not shown) such as a tiller is connected to the lower case 21 and the top link 22 so as to be movable up and down. Further, a PTO shaft 24 that transmits power to a working machine such as a tiller is provided on the rear side surface of the mission case 17 so as to protrude rearward.

  Further, a power transmission shaft 25 having a universal shaft joint extends from the rear surface of the engine 5 toward the front surface of the transmission case 17. The rotational output of the engine 5 is transmitted to the transmission case 17, and then the transmission output of the transmission case 17 is transmitted to the rear wheel 4 via a differential gear mechanism (not shown). Further, the transmission output of the transmission case 17 is configured to be transmitted to the front wheel 3 via the front wheel drive shaft 26.

  In the present embodiment, the steering handle 9 is disposed on the steering column 31 protruding from the step 7 in front of the driver seat 8, and the loader operating mechanism 32 is detachably disposed at the right rear portion of the step 7. A shift pedal 33 is disposed on the right side of the steering column 31.

  Next, with reference to FIGS. 3 to 9, the mounting structure of the driver's seat 8 and the like will be described. As shown in FIG. 6, the work implement elevating lever 35 is disposed on the right fender 34 portion on the right side of the driver seat 8, and the traveling speed change lever 37 and the PTO speed change lever 38 are disposed on the left fender 36 portion on the left side of the driver seat 8. Has been.

  As shown in FIGS. 3 to 9, the seat frame 20 includes front and rear bottom frames 41 and 42, left and right bottom frames 43 and 44, left and right front vertical frames 45 and 46, and left and right rear vertical frames 47. , 48, front and rear upper surface frames 49, 50, and left and right upper surface frames 51, 52. The bottom frames 41 to 44, the vertical frames 45 to 48, and the top frames 49 to 52 are connected in a rectangular shape to form the seat frame 20 in a rectangular frame structure.

  In other words, the bottom frame 41 to 44, the vertical frames 45 to 48, and the top frames 49 to 52 are formed in a frame so as to form 12 sides of a rectangular parallelepiped, thereby forming the seat frame 20. In addition, although each bottom frame 41-44, each vertical frame 45-48, and each upper surface frame 49-52 were connected by bolt fastening, you may connect by welding fixation etc.

  As shown in FIGS. 3 to 9, the front and rear bottom frames 41, 42 are detachably bolted to the upper surface of the mission case 17, and the rectangular parallelepiped saddle-shaped seat frame 20 is placed on the upper surface of the mission case 17. On the other hand, left and right slide rails 55 and 56 that move back and forth in multiple stages are fixed to the upper surfaces of the left and right upper surface frames 51 and 52 by operating the seat front and rear position adjusting lever 59. The seat front support 57 is suspended from the front of the left and right slide rails 55 and 56, and the seat rear support 58 is suspended from the rear of the left and right slide rails 55 and 56.

  The front portion of the driver's seat 8 is supported on the seat front support 57 having the front / rear rotation shaft 60. The rear portion of the driver's seat 8 is supported on the seat rear support 58 via the cushion rubber body 61. The driver seat 8 is configured to move forward and forward about the front / rear rotation shaft 60. Further, as shown in FIGS. 3 and 6, a fuel tank 62 for supplying fuel to the engine 5 is provided. A fuel tank 62 is placed on the upper surface of the mission case 17, and the fuel tank 62 is supported in a rectangular space in the seat frame 20.

  As shown in FIGS. 3 to 5, 8, and 9, the base end portion of the lift arm 64 is pivotally supported on the upper surface of the rear portion of the transmission case 17 via the lift fulcrum shaft 63. The lower link 21 is connected to the tip of the lift arm 64 via a lift rod 65. A hydraulic lift cylinder 66 is provided on the rear surface portion of the transmission case 17, and the hydraulic lift cylinder 66 is connected to an intermediate portion of the lift arm 64. In addition, a lifting hydraulic valve mechanism 67 for lifting the working machine that operates the hydraulic lift cylinder 66 is provided. The elevating hydraulic valve mechanism 67 is supported on the right side surface of the seat frame 20 via the right front vertical frame 46 and the right upper frame 52.

  A feedback link 68 for returning the lift hydraulic valve mechanism 67 to neutral is connected between the lower link 21 and the lift hydraulic valve mechanism 67. By operating the work implement elevating lever 35, the elevating hydraulic valve mechanism 67 is switched, the hydraulic lift cylinder 66 is operated, the lower link 21 is moved up and down, and work such as a tillage work machine connected to the lower link 21 and the top link 22 is performed. A machine (not shown) is moved up and down to support the work machine at an arbitrary height.

  Further, a hydraulic relief valve mechanism 69 for raising and lowering the work implement for limiting the hydraulic pressure to the hydraulic lift cylinder 66 supplied from a hydraulic pump (not shown) is provided. A hydraulic relief valve mechanism 69 is fixed to the rear bottom frame 42 of the seat frame 20, and the hydraulic relief valve mechanism 69 is supported on the rear portion of the seat frame 20 via the bottom frame 42. The hydraulic relief valve mechanism 69 is detachably provided by using a frame other than the rear bottom frame 42 (for example, the left and right bottom frames 43 and 44 or the vertical frames 45 to 48) of the seat frame 20. You can also. On the other hand, a hydraulic lift cylinder 66, a lifting hydraulic valve mechanism 67, and a hydraulic relief valve mechanism 69 are connected by a plurality of hydraulic pipes. High pressure oil of a hydraulic pump (not shown) is supplied to the hydraulic lift cylinder 66 via the lifting hydraulic valve mechanism 67 while being restricted by the hydraulic relief valve mechanism 69.

  As shown in FIGS. 1 and 3 to 9, a traveling machine body 2 having an engine 5 and a mission case 17 is provided, and a driver seat 8 is disposed above the mission case 17 via a seat frame 20. In a work vehicle equipped with a work machine, the seat frame 20 includes bottom frames 41 to 44, vertical frames 45 to 48, and top frames 49 to 52. The bottom frames 41 to 44, the vertical frames 45 to 48, and the top frame 49 are provided. ˜52 are connected to a rectangle (a frame shape forming 12 sides of a rectangular parallelepiped).

  Therefore, the ground height of the upper surface of the mission case 17 can be made low while ensuring the ground height of the driver seat 8 support position. Further, the layout of the driver's seat 8 or the transmission case 17 and the peripheral components (elevating hydraulic valve mechanism 67, hydraulic relief valve mechanism 69, etc.) is hardly restricted. It is possible to assemble these additional parts (elevating hydraulic valve mechanism 67, hydraulic relief valve mechanism 69, etc.) dispersed around the driver seat 8 or the transmission case 17. The attachment / detachment workability of attached parts (such as the lifting hydraulic valve mechanism 67 and the hydraulic relief valve mechanism 69) arranged around the driver seat 8 or the transmission case 17 can be improved.

  As shown in FIGS. 3 to 9, a lifting hydraulic valve mechanism 67 for lifting the work implement is provided on one side surface (right side surface) of the seat frame 20 via the right front vertical frame 46 or the right upper frame 52. It is configured to support. Therefore, the detachability workability of the lifting hydraulic valve mechanism 67 can be improved. Further, it is not necessary to secure a place for installing the elevating hydraulic valve mechanism 67 in the mission case 17, and the mission case 17 can be formed in a simple appearance, and the mission case 17 can be manufactured at low cost. For example, in a manufacturing place or a repair place, the lift hydraulic valve mechanism 67 in a unit state in which the working machine lift lever 35 and the like are assembled can be handled as a single component, and assembly workability or maintenance work of the lift hydraulic valve mechanism 67 is possible. Can be improved.

  As shown in FIGS. 3 to 9, a hydraulic relief valve mechanism 69 for a working machine is supported on the other side surface (rear surface side) of the seat frame 20 via a rear bottom frame 42. Therefore, the workability of attaching / detaching the hydraulic relief valve mechanism 69 can be improved. Further, it is not necessary to secure a place for installing the hydraulic relief valve mechanism 69 in the transmission case 17, the external appearance of the transmission case 17 can be formed in a simple shape, and the transmission case 17 can be manufactured at low cost. For example, the hydraulic relief valve mechanism 69 can be handled as a single part in a manufacturing place or a repair place, and the assembly workability or maintenance workability of the hydraulic relief valve mechanism 69 can be improved.

  As shown in FIGS. 3 to 9, the fuel tank 62 is placed on the upper surface of the mission case 17, and the fuel tank 62 is supported in a rectangular space within the seat frame 20 (inside space of a rectangular parallelepiped). Therefore, the fuel tank 62 can be assembled in a compact manner by effectively utilizing the space formed between the mission case 17 and the driver seat 8. Further, the fuel tank 62 can be surrounded and protected by the mission case 17, the driver's seat 8, and the seat frame 20 (vertical frames 45 to 48, etc.). Since the upper surface side of the fuel tank 62 is shielded by the driver's seat 8 (operator), the fuel tank 62 is hardly heated by sunlight or the like, and the temperature of the fuel in the fuel tank 62 can be suppressed from rising.

2 traveling body 5 engine 8 driver's seat 17 mission case 20 seat frame 41 front bottom frame 42 rear bottom frame 43 left bottom frame 44 right bottom frame 45 left front vertical frame 46 right front vertical frame 47 left Rear vertical frame 48 Right rear vertical frame 49 Front upper frame 50 Rear upper frame 51 Left upper frame 52 Right upper frame 62 Fuel tank 67 Lift hydraulic valve mechanism 69 Hydraulic relief valve mechanism

Claims (1)

A traveling machine body (2) having an engine (5) and a mission case (17) is provided, and a driver seat (8) is arranged above the mission case (17) via a seat frame (20), and the traveling machine body (2) In the agricultural tractor equipped with the work equipment,
The seat frame (20) includes bottom frames (41) to (44), vertical frames (45) to (48), and top frames (49) to (52), and the bottom frames (41) to (44). and said vertical frames (45) to (48) and the top frame (49) - connecting (52) so that the rectangular frame structure, the transmission case (17) before and after the bottom frame on the top surface (41) ( 42), the seat case (17) is supported by the transmission case (17), a fuel tank (62) is placed on the upper surface of the transmission case (17), and the upper frame (49) to 49- The fuel tank (62) is positioned in a rectangular space in the seat frame (20) so that the fuel tank (62) does not protrude above (52).
Agricultural tractor .

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