JP5643734B2 - Tractor - Google Patents

Description

  The present invention relates to a tractor.

  2. Description of the Related Art Conventionally, a tractor including a vehicle body frame extending in the front-rear direction, an elevating cylinder that raises and lowers a work implement attached to the rear portion of the vehicle body frame, and a seat disposed above the elevating cylinder is known (for example, , See Patent Document 1). In such a tractor, an engine is provided at the front part of the vehicle body frame, and a clutch housing that accommodates a clutch, a transmission case that accommodates a transmission, a rear axle case that accommodates a rear axle, and the like are provided at the rear part of the engine. It is done. The clutch housing, the transmission case, and the rear axle case also serve as a tractor body frame.

JP 2011-125308 A

  However, in the tractor described in Patent Document 1, the lifting cylinder is disposed above the body frame, and the seat is disposed above the lifting cylinder. For this reason, there is a problem that the center of gravity of the entire tractor tends to be high and the seating position of the driver is likely to be high. In particular, when the driver's seating position is high, in a farm (for example, an orchard) that is subject to height restrictions, trees or the like may become an obstacle and hinder farm work.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a tractor that can lower the center of gravity of the entire tractor and lower the seating position of the driver.

(Constitution)
The first feature of the present invention is that the tractor is configured as follows. A tractor comprising: a vehicle body frame extending in the front-rear direction; an elevating cylinder for elevating a work implement attached to a rear portion of the vehicle body frame; and a seat disposed above the elevating cylinder and seated by a driver. the disposed at a rear portion of the vehicle body frame in a state spaced horizontally at a predetermined distance from each other, the rear axle pair comprises a pair of left and right axle drive motor for each drive, the lifting cylinder, viewed The vehicle body frame is provided so as to be positioned between the pair of left and right axle drive motors and overlapped with the axle drive motor in a side view .

(Operation and effect of the invention)
According to the first feature of the present invention, space is formed in the vehicle body frame by disposing the axle drive motors on the left and right sides of the vehicle body frame instead of the clutch, the transmission and the like. Thus, by using the space in the vehicle body frame to arrange the lifting cylinder and the seat, the position of the lifting cylinder and the seat can be lowered to lower the center of gravity of the entire tractor, and the seating position of the driver can be lowered. can do. In particular, since the seating position of the driver is lowered, there is a low possibility that trees or the like will be an obstacle in an orchard or the like and hinder agricultural work.

(Constitution)
The second feature of the present invention is that the tractor according to the first feature of the present invention is configured as follows. A rear PTO shaft that projects rearward from a rear portion of the vehicle body frame; and a rear PTO shaft drive motor that drives the rear PTO shaft, the rear PTO shaft drive motor driving the pair of left and right axles in plan view. The vehicle body frame is provided in a state of being located between the motors and overlapping with the axle drive motor in a side view .

(Operation and effect of the invention)
According to the second feature of the present invention, the rear PTO shaft drive motor can be compactly arranged by effectively using the space in the vehicle body frame. In addition, by changing the position of the rear PTO shaft drive motor in the vehicle body frame, the position of the rear PTO shaft can be adjusted to facilitate matching with the work machine attached to the rear PTO shaft.

(Constitution)
The third feature of the present invention is that the tractor according to the first or second feature of the present invention is configured as follows. The vehicle body frame includes a mid PTO shaft that protrudes downward from a front and rear midway portion of the vehicle body frame, and a mid PTO shaft drive motor that drives the mid PTO shaft. The mid PTO shaft drive motor is included in the vehicle body frame.

(Operation and effect of the invention)
According to the third feature of the present invention, the mid PTO shaft drive motor can be compactly arranged by effectively using the space in the vehicle body frame. In addition, by changing the position of the mid PTO shaft drive motor in the vehicle body frame, the position of the mid PTO shaft can be adjusted to facilitate matching with a work machine attached to the mid PTO shaft. For example, when a work machine (mower) having an input shaft facing upward is provided on the lower side of the vehicle body frame, the input shaft of the work machine and the mid PTO shaft are easily connected.

A side view showing a tractor concerning a first embodiment of the present invention. The top view which shows arrangement | positioning of the axle shaft drive motor and rear PTO shaft drive motor which concern on 1st embodiment of this invention. (A) The side view which shows the hydraulic cylinder and the height position of a seat concerning a prior art example. (B) The side view which shows the hydraulic cylinder which concerns on this invention, and the height position of a seat. The side view which shows arrangement | positioning of the mid PTO shaft drive motor which concerns on 2nd embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  First, a tractor according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the tractor is a so-called electric tractor. The tractor includes a body frame 1. The vehicle body frame 1 is formed of a cast case-like member or the like in this embodiment. The body frame 1 includes a front frame 2, a center frame 3, a rear frame 4, and the like in order from the front.

  A front axle 5 is rotatably supported below the front frame 2. A pair of left and right front wheels 6 are provided at the left and right ends of the front axle 5. A battery 7 is disposed on the front frame 2 (the front portion of the vehicle body frame 1). Thereby, the battery 7 can also serve as a balance weight.

  A working machine (not shown) (not shown) is attached to the rear part of the rear frame 4 via a three-point link mechanism 8. The three-point link mechanism 8 is connected to a hydraulic cylinder 10 as a lifting cylinder via a lift arm 9. Thereby, the working machine is moved up and down via the lift arm 9 and the three-point link mechanism 8 as the hydraulic cylinder 10 expands and contracts. A seat 11 on which a driver is seated is disposed above the hydraulic cylinder 10.

  As shown in FIG. 2, the rear frame 4 is provided with a pair of left and right axle drive motors 12 on both left and right side surfaces thereof. The left and right axle drive motors 12 are supplied with power from the battery 7. The axle drive motor 12 has a motor shaft (not shown), and a rear axle 14 is connected to the motor shaft via an axle planetary mechanism 13 as a speed reduction mechanism. A rear wheel 15 is provided on the rear axle 14. In this embodiment, since the differential gear for the rear wheel 15 is not provided, the differential between the left and right rear wheels 15 is performed by controlling the rotation of the left and right axle drive motors 12.

  A rear PTO shaft 16 projects rearward from the rear portion of the rear frame 4. A rear PTO shaft drive motor 17 is disposed in the rear frame 4. The rear PTO shaft drive motor 17 is supplied with electric power from the battery 7. The rear PTO shaft drive motor 17 has a motor shaft (not shown), and a rear PTO shaft 16 is connected to the motor shaft via a rear PTO shaft planetary mechanism 18 as a speed reduction mechanism. The arrangement position of the rear PTO shaft drive motor 17 is not particularly limited, but in the present embodiment, the rear PTO shaft drive motor 17 is arranged at the rear left and right center of the body frame 1 (rear frame 4).

  Here, conventionally, as shown in FIG. 3A, the hydraulic cylinder 110 is disposed above the vehicle body frame 101. For this reason, the seating position of the driver sitting on the seat 111 disposed above the hydraulic cylinder 110 is P1. On the other hand, in the present invention, the hydraulic cylinder 10 is disposed in the rear frame 4 as shown in FIG. For this reason, the seating position P2 of the driver who sits on the seat 11 disposed above the hydraulic cylinder 10 is lower than the seating position P1 shown in FIG.

  The arrangement position of the hydraulic cylinder 10 is not particularly limited, but in the present embodiment, the hydraulic cylinder 10 is arranged such that at least a part thereof overlaps with the pair of left and right axle drive motors 12 in a side view. Thus, the positions of the hydraulic cylinder 10 and the seat 11 can be further lowered to further lower the center of gravity of the entire tractor, and the seating position of the driver can be further lowered. In the present embodiment, a rear PTO shaft drive motor 17 is disposed below the hydraulic cylinder 10.

  As described above, the tractor according to the present embodiment includes the vehicle body frame 1 extending in the front-rear direction, the hydraulic cylinder 10 as a lifting cylinder that lifts and lowers the work implement attached to the rear portion of the vehicle body frame 1, and the upper side of the hydraulic cylinder 10. And a seat 11 on which a driver is seated. The tractor is disposed on the left and right sides of the rear portion of the vehicle body frame 1 at a predetermined interval to drive the pair of left and right rear axles 14. A pair of left and right axle drive motors 12 are provided, and the hydraulic cylinder 10 is disposed between the pair of left and right axle drive motors 12 in a plan view and is provided in the vehicle body frame 1.

  With such a configuration, a space is formed in the vehicle body frame 1 by arranging the axle drive motors 12 on the left and right sides of the vehicle body frame 1 instead of the clutch, the transmission, and the like. Thus, by arranging the hydraulic cylinder 10 and the seat 11 using the space in the body frame 1, the positions of the hydraulic cylinder 10 and the seat 11 can be lowered to lower the center of gravity of the entire tractor, and the driver Can be lowered. In particular, since the seating position P2 of the driver is lowered, there is a low possibility that trees or the like will become an obstacle in an orchard or the like and hinder the agricultural work. In addition, since the driver's seating position P2 is lowered, it is possible to give the driver a sense of security. In the space in the vehicle body frame 1, devices (for example, a battery, an inverter, a controller, etc.) necessary for electrification of the tractor can be arranged.

  The tractor according to this embodiment includes a rear PTO shaft 16 that protrudes rearward from the rear portion of the vehicle body frame 1, and a rear PTO shaft drive motor 17 that drives the rear PTO shaft 16, and a rear PTO shaft drive motor 17. Is provided in the body frame 1.

  With such a configuration, the rear PTO shaft drive motor 17 can be compactly arranged by effectively using the space in the vehicle body frame 1. Further, by changing the position of the rear PTO shaft drive motor 17 within the vehicle body frame 1, the position of the rear PTO shaft 16 can be adjusted to facilitate matching with the work machine attached to the rear PTO shaft 16. it can.

  In addition, although the vehicle body frame 1 which concerns on this embodiment is comprised by the case-like member made from casting, etc., this invention is not limited to this. For example, the body frame may be configured by assembling a rod-like member or a plate-like member into a frame shape.

  Next, a tractor according to a second embodiment of the present invention will be described with reference to FIG. In addition, about the member of the same code | symbol as 1st embodiment, since it is the same structure as 1st embodiment, detailed description is abbreviate | omitted.

  As shown in FIG. 4, the mid PTO shaft 19 protrudes downward from the center frame 3. A mid PTO shaft drive motor 20 is disposed in the center frame 3. The power of the battery 7 is supplied to the mid PTO shaft drive motor 20. The mid PTO shaft drive motor 20 has a motor shaft (not shown), and a mid PTO shaft 19 is connected to the motor shaft via a mid PTO shaft planetary mechanism 21 as a speed reduction mechanism. The arrangement position of the mid PTO shaft drive motor 20 is not particularly limited.

  A mower 22 is provided below the body frame 1. The mower 22 is supported by a lifting link (not shown) provided in the body frame 1. The mower 22 has an input shaft 23, and a mid PTO shaft 19 is connected to the input shaft 23 via a telescopic transmission shaft 24.

  As described above, the tractor according to the present embodiment includes the mid PTO shaft 19 that protrudes downward from the front and rear midway portion of the vehicle body frame 1 and the mid PTO shaft drive motor 20 that drives the mid PTO shaft 19. The PTO shaft drive motor 20 is provided in the vehicle body frame 1.

  With such a configuration, the mid PTO shaft drive motor 20 can be arranged in a compact manner by effectively using the space in the vehicle body frame 1. Further, by changing the position of the mid PTO shaft drive motor 20 in the vehicle body frame 1, the position of the mid PTO shaft 19 can be adjusted to facilitate matching with a work machine attached to the mid PTO shaft 19. it can. For example, when the work machine (more 22) with the input shaft 23 provided upward is provided on the lower side of the vehicle body frame 1, the input shaft 23 of the work machine (more 22) and the mid PTO shaft 19 are easily connected.

  The present invention can be used for a tractor including a battery and a motor. Moreover, this invention can be utilized for a tractor provided with an engine, a generator, and a motor.

1 Body frame 10 Hydraulic cylinder (lifting cylinder)
11 Seat 12 Axle Drive Motor 14 Rear Axle 16 Rear PTO Shaft 17 Rear PTO Shaft Drive Motor 19 Mid PTO Shaft 20 Mid PTO Shaft Drive Motor

Claims (3)

A body frame extending in the front-rear direction;
An elevating cylinder for elevating a work implement attached to a rear portion of the vehicle body frame;
A tractor that is disposed above the elevating cylinder and has a seat on which a driver sits,
Wherein is disposed at a rear portion of the vehicle body frame in a state spaced horizontally at a predetermined distance from each other, the rear axle pair comprises a pair of left and right axle drive motor for each drive,
The elevating cylinder is disposed between the pair of left and right axle drive motors in a plan view , and is disposed in a state overlapping with the axle drive motor in a side view, and is provided in the vehicle body frame. . A rear PTO shaft protruding rearward from the rear portion of the vehicle body frame;
A rear PTO shaft drive motor for driving the rear PTO shaft,
The rear PTO shaft drive motor is disposed in a state of being positioned between the pair of left and right axle drive motors in a plan view and overlapping with the axle drive motor in a side view. The tractor according to claim 1 provided. A mid PTO shaft projecting downward from the front-rear midway part of the body frame;
A mid PTO shaft drive motor for driving the mid PTO shaft,
The tractor according to claim 1, wherein the mid PTO shaft drive motor is provided in the vehicle body frame.

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