JP2023006392A - work vehicle - Google Patents

Abstract

To provide a work vehicle capable of reducing a ground height and performing work in a state in which an implement used in a normal work vehicle, is attached to the work vehicle, for solving problems for example, for traveling under trees in a fruit garden or the like, a work vehicle to which wheels having a small tire diameter are attached and whose vehicle body is made low, is used, the work vehicle whose vehicle body is made low, comprises a PTO and an implement coupling link similar to a normal work vehicle, and various kinds of implements can be attached to the work vehicle, however, a fitting position is lower than a normal fitting position, angles formed when the implement is grounded, are varied, therefore a dedicated implement is required.SOLUTION: A work vehicle has a PTO shaft 6 for providing power to an outside from a transmission case 5 which transmits drive force to travel wheels 2, and a lifting link mechanism L for vertically moving an implement 4 is provided on a rear part of a travel vehicle body 1, a power transfer mechanism 50 is provided between the lifting link mechanism L and the implement 4 for outputting power input from the PTO shaft 6 at a position above a position where the power is input.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle having a working machine attached to its rear portion.

Since it runs under trees in an orchard, etc., the upper end of the tail pipe is set lower than the vehicle body, and wheels with small diameter tires are installed so that the vertical tail pipe does not come in contact with the branches of trees during work. There is a working vehicle in which the .DELTA.

Japanese Patent No. 6531692

A work vehicle with a lowered body is also equipped with a PTO and a work equipment connection link like a normal work vehicle, and various work equipment can be attached. was different, and a dedicated work machine was required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a working vehicle having a low ground clearance, which can be operated by mounting a working machine that is used in a normal working vehicle. do.

According to the first aspect of the invention, a PTO shaft 6 for taking out power from a transmission case 5 for transmitting driving force to the traveling wheels 2 is provided, and an elevating link mechanism L for vertically moving the working machine 4 is provided at the rear part of the traveling vehicle body 1. In the traveling vehicle, a power transfer mechanism 50 is provided between the lifting link mechanism L and the work machine 4 to output the power input from the PTO shaft 6 above the input position.

According to the first aspect of the invention, the power transfer mechanism 50 is provided between the lifting link mechanism L and the work machine 4 to output the power input from the PTO shaft 6 above the input position. A general work machine 4 that is not a dedicated product can be attached to a low-height work vehicle.

According to the second aspect of the invention, the connecting mechanism 3 is attached to the lifting link mechanism L, the working machine 4 is detachably attached to the connecting mechanism 3, and the connecting mechanism 3 is provided with the power transfer mechanism 50. It is the described work vehicle.

According to the second aspect of the invention, the connecting mechanism 3 is attached to the lifting link mechanism L, the working machine 4 is detachably attached to the connecting mechanism 3, and the power transfer mechanism 50 is provided to the connecting mechanism 3. A general work machine 4 which is not a dedicated product can be easily mounted on a work vehicle with a low ground clearance.

According to the third aspect of the invention, the connecting mechanism 3 is composed of a front-mounted hitch 30 connected to the traveling vehicle body 1 side and a rear-mounted hitch 40 connected to the working machine 4 side, and a rear hitch portion 44 of the rear-mounted hitch 40 is configured. , 45 are provided above the front hitch portions 36, 37 of the front attachment hitch 30.

1 is a side view showing a state where a working machine is attached to the rear part of a tractor according to an embodiment of the present invention; FIG. FIG. 4 is a side view for explaining operation of attaching a working machine to the rear portion of the tractor according to the embodiment of the present invention; FIG. 4 is a perspective view for explaining the effect of attaching a working machine to the rear portion of the tractor according to the embodiment of the present invention; 1 is a side cross-sectional view of a main part of a tractor according to an embodiment of the present invention; FIG.

A low-floor tractor, which is a type of work vehicle shown as an embodiment of the present invention (for running under trees in an orchard, etc., the vehicle body is lowered by installing wheels with small tire diameters). A tractor with a low ground clearance) will be explained. In the following, front and rear and left and right are referred to with reference to the forward direction of the airframe.

The tractor is propelled by left and right front wheels and left and right rear wheels 2 as running wheels, and a rotary tiller 4 as a working machine is detachably mounted on the rear portion thereof via a coupling mechanism 3 .

The traveling vehicle body 1 of the tractor shifts the driving force of the engine mounted on the front part by the transmission case 5 and transmits it to the left and right front wheels and the left and right rear wheels 2 to drive and rotate and progress, and the transmission case 5 transmits the driving force. is branched and transmitted to the PTO shaft 6 that extracts the driving force to the outside.

At the rear of the traveling vehicle body 1, a hydraulic device (work machine lifting device) 8 having left and right lift arms 7 on a transmission case 5 is provided, and left and right fenders 9 covering the left and right rear wheels 2 are provided. A driver's seat 10 is provided, and a PTO shaft 6 projects rearward from the rear end of the transmission case 5 . The PTO shaft 6 is connected to a proximal end universal joint of a drive shaft 6a having universal joints at both ends.

An upper link base 11 is fixed to the upper rear end of the traveling vehicle body 1 at a central position in the lateral direction of the body, and a base of an upper link 12 is pivotally supported on the rear end of the upper link base 11 so as to be vertically rotatable. , a ball joint 12a is provided at the tip of the upper link 12. As shown in FIG.

Further, the base portion of the left and right lower links 13 is pivotally supported at the lower rear end portion of the traveling vehicle body 1 so as to be vertically rotatable, and ball joints 13a are provided at the tips of the left and right lower links 13, respectively.

The middle portion of the left and right lower links 13 and the left and right lift arms 7 are connected by the left and right lift rods 14, respectively. The rotary tiller 4 attached via 3 is moved up and down. The upper link 12 and the left and right lower links 13 constitute a lifting link mechanism L.

The rotary cultivator 4 has a gear case 16 projecting forward from an input shaft 15 formed with a spline at the tip of the shaft. A rotary machine frame 20 is constructed by A claw shaft is rotatably supported in the lower part of the transmission case 18 and the side frame 19, and a large number of tillage tines are attached to the claw shaft to form a rotary tillage section 21. As shown in FIG. A tillage cover 22 is provided to cover the upper part, both sides and the rear part of the rotary tillage part 21 .

An upper mast 23 is fixed to the gear case 16 , and a pair of left and right connecting brackets 24 are provided on the left and right support arms 17 so as to protrude forward.

The upper end of the upper mast 23 is provided with an upper engaging portion 25 constituted by a horizontal pin. A pair of left and right connecting brackets 24 are provided with a pair of left and right lower engaging portions 26 configured by pins in the left and right direction.

The connecting mechanism 3 is composed of a standard attachment hitch 30 as a front attachment hitch for mounting a standard specification work machine and a conversion attachment hitch 40 as a rear attachment hitch.

The standard attachment hitch 30 connects the ball joint 12a at the tip of the upper link 12 with an upper link pin 33 to an engagement hole 32a of an upper attachment stay 32 on the side of the traveling vehicle body 1 provided at the upper center of an inverted U-shaped standard hitch frame 31. The ball joints 13a at the ends of the left and right lower links 13 are connected to the left and right lower link pins 34 provided on the left and right sides of the lower portion of the standard hitch frame 31 with lower link pins 35, respectively, and attached to the traveling vehicle body 1.

The standard attachment hitch 30 is provided with an upward concave standard upper connecting portion 36 constituting a front hitch portion at the upper center of the standard hitch frame 31, and left and right lower connecting portions constituting the front hitch portion on the left and right of the lower portion of the standard hitch frame 31. A portion 37 is provided to constitute a general quick hitch (one-touch hitch).

The left and right lower connecting portion 37 includes a downward hook-shaped upper engaging body 37a fixed to the standard hitch frame 31, and an upward hook-shaped lower engaging body 37a whose base is pivotally supported by a pivot shaft and whose tip side rotates up and down. 37b. The lower engaging body 37b is biased by a biasing member in a direction in which the distal end side thereof rotates upward. In this embodiment, when the left and right engagement pins 43)) of the conversion attachment hitch 40, which will be described later, come into contact with each other, the lower engaging body 37b rotates downward on the surface of the guiding cam, and the pin body moves downward with the upper engaging body 37a. The engaging body 37b is in a holding state. The held state is released by operating the release lever 38 to rotate the lower engaging member 37b downward.

A holding portion 39 is provided at the center of the lower portion of the standard hitch frame 31 to hold a universal joint on the distal end side of the drive shaft 6a.

The conversion hitch 40 engages a mounting pin 42a of an upper mounting stay 42 provided at the upper center of an inverted U-shaped conversion hitch frame 41 with a concave portion of a standard upper connection portion 36 of the standard mounting hitch 30 from above, and the conversion hitch is mounted. The left and right engagement pins 43 provided on the left and right of the lower portion of the frame 41 are engaged with the left and right lower connecting portions 37 of the standard attachment hitch 30 so as to be attached to the rear portion of the standard attachment hitch 30 .

Then, the conversion mounting hitch 40 is provided with an upwardly concave conversion upper connection portion 44 that constitutes a rear hitch portion at the upper center of the conversion hitch frame 41, and left and right lower connection portions that constitute the rear hitch portion on the left and right of the lower portion of the conversion hitch frame 41. A portion 45 is provided to constitute a general quick hitch (one-touch hitch).

In addition, the left and right lower connecting part 45 includes a downward hook-shaped upper engaging body 46a fixed to the conversion hitch frame 41 and an upward hook-shaped lower engaging body whose base is pivotally supported by a pivot shaft and whose tip end side is rotated up and down. 46b. The lower engaging body 46b is biased by a biasing member in a direction in which the distal end side thereof rotates upward. When the left and right lower engaging portions 26 of the cultivator 4 come into contact with each other, the lower engaging member 46b is rotated downward by the surface of the guide cam, and the left and right lower engaging portions 26 are separated from the upper engaging member 46a and the lower engaging member 46b. is maintained. The held state is released by operating the release lever 47 to rotate the lower engaging member 46b downward.

A power transfer mechanism 50 is provided in the center of the conversion hitch frame 41 .

The power transfer mechanism 50 has a transmission case 51 fixed to the conversion hitch frame 41, and a spline formed at the tip of a shaft that is rotatably supported by bearings in the lower part of the transmission case 51 and extends forward from the transmission case 51. It is composed of an input bevel gear 52 having an input shaft 52a and an output bevel gear 53 that is rotatably supported by a bearing on the upper part of a transmission case 51 and meshes with the input bevel gear 52. As shown in FIG.

A spline engagement hole 53a is formed in the axial center of the output bevel gear 53, and the input shaft 15 of the rotary tiller 4 can be spline-engaged with the spline engagement hole 53a through a hole provided in the rear wall of the transmission case 51. It is configured as follows.

Then, in a state where the conversion attachment hitch 40 is attached to the standard attachment hitch 30, the rear hitch portion composed of the conversion upper connection portion 44 and the left and right lower connection portions 45 of the conversion attachment hitch 40 becomes the standard upper connection portion 36 of the standard attachment hitch 30 and the When the standard attachment hitch 30 is mounted on a standard tractor in which the rear hitch portion of the conversion attachment hitch 40 has a standard ground clearance and is configured to be higher than the front hitch portion formed by the left and right lower connecting portions 37. the same height as the hitch part of

In addition, the power transfer mechanism 50 transfers the driving force of the drive shaft 6a at a lower position to a higher position via the input bevel gear 52 and the output bevel gear 53 by spline-engaging the input shaft 52a with the distal end side universal joint of the drive shaft 6a. can be transmitted to the input shaft 15 of the rotary tiller 4.

The rotary cultivator 4 engages the upper engaging portion 25 with the concave portion of the conversion upper connecting portion 44 of the conversion attachment hitch 40 from above, and engages the left and right lower engaging portions 26 with the left and right lower connecting portions 45 respectively. The input shaft 15 is spline-engaged with the spline engagement hole 53a of the output bevel gear 53 of the power transfer mechanism 50, and the driving force from the PTO shaft 6 is input.

In short, when the connection mechanism 3 consisting of the standard attachment hitch 30 and the conversion attachment hitch 40 is attached to the tractor of the low-floor specification, the rear side composed of the conversion upper connection portion 44 and the left and right lower connection portions 45 of the conversion attachment hitch 40 of the connection mechanism 3 is mounted. The hitch portion is at the same height as the hitch portion when the standard attachment hitch 30 is attached to a standard tractor with a standard ground clearance, and the drive force of the drive shaft 6a at a lower position is increased by the power transfer mechanism 50 to the ground clearance. is a high position when the standard attachment hitch 30 is attached to a standard standard tractor, so that a standard specification rotary tiller 4 can be attached to a low-floor specification tractor to perform appropriate tillage work.

Therefore, since the rotary tiller 4 of standard specifications to be attached to a tractor of standard specifications used in paddy fields and fields can be attached to a tractor of low floor specifications, and proper tillage work can be performed, a dedicated work machine for low floor specifications is required. Therefore, it is possible to realize an inexpensive form of farming.

In the above-described embodiment, an example of using the rotary tiller 4 as a working machine is shown, but any other working machine such as a mowing machine may be used.

Also, depending on the work machine, only the low-floor specification work machine may be available, so when mounting the low-floor specification work machine to the tractor, only the standard attachment hitch 30 is attached to the low-floor specification tractor. , a work machine for low-floor specifications may be attached to the standard mounting hitch 30 to carry out the work.

1 running vehicle body 2 running wheels (rear wheels)
3 connection mechanism 4 working machine (rotary tiller)
5 Transmission case 6 PTO shaft 30 Front mounting hitch (standard mounting hitch)
36 front hitch part (standard upper connection part)
37 front hitch part (left and right lower connection part)
40 rear mounting hitch (conversion mounting hitch)
44 Rear hitch part (conversion upper connection part)
45 Rear hitch part (left and right lower connection part)
50 Power transfer mechanism L Lifting link mechanism

Claims (3)

A PTO shaft (6) that extracts power from the transmission case (5) that transmits driving force to the traveling wheels (2) is provided, and a lifting link mechanism (4) that vertically operates the work machine (4) is provided at the rear of the traveling vehicle body (1). L), a power transfer mechanism ( 50). A connection mechanism (3) is attached to the lifting link mechanism (L), a working machine (4) is detachably attached to the connection mechanism (3), and a power transfer mechanism (50) is provided to the connection mechanism (3). 2. The work vehicle according to claim 1, characterized in that: A connecting mechanism (3) is composed of a front mounting hitch (30) connected to the traveling vehicle body (1) side and a rear mounting hitch (40) connected to the working machine (4) side, and the rear mounting hitch (40) is A work vehicle according to claim 2, wherein the rear hitch portions (44, 45) are located above the front hitch portions (36, 37) of the front mounting hitch (30).

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