JPH1189314A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tractor enabling the easy arrangement of hydraulic oil pipings in a work device and the easy disposition of various operation levers on the lateral sides of a driver's seat by disposing an outer hydraulic pressure- taking device between a pair of right and left support columns behind the driver' s seat. SOLUTION: A driver's seat 14 is disposed in the rear portion of the body of the tractor, and a pair of right and left support columns 75 for a ROPUSU 74 are disposed behind the driver's seat 14. In the tractor, an outer hydraulic pressure-taking device 1 is disposed between a pair of right and left support columns 75 behind the driver's seat 14. An operation lever for the outer hydraulic pressure-taking device 1 is disposed on the right side of the driver's seat 14, and the operation lever can be connected to the spool of the outer hydraulic pressure-taking device 1 through a cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a tractor provided with an external hydraulic take-out device.

[0002]

2. Description of the Related Art In a tractor, a driver's seat is provided at the rear of the tractor body, and a pair of left and right supports of a rope, such as a safety frame, a cabin, and a canopy (shading), are provided behind the driver's seat, and are mounted behind the tractor body. An external hydraulic pressure extracting device for supplying hydraulic pressure to a working machine or the like is provided, but in this type of conventional tractor, an external hydraulic pressure extracting device is provided on a side of a driver's seat.

[0003]

Therefore, conventionally, when a working machine is mounted behind a tractor body via a three-point link mechanism, it is necessary to supply an external hydraulic pressure to the working machine from an external hydraulic take-out device. The piping between the hydraulic take-out device and the working machine became long, and the installation of the piping was troublesome. In addition, there is a problem that the space on the side of the driver's seat is narrowed by the external hydraulic pressure extracting device, and it is difficult to mount various operation levers on the side of the driver's seat.

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to easily provide hydraulic piping to a working machine mounted behind a tractor body, and to easily mount various operation levers to side portions of a driver's seat. It is to become.

[0005]

A first technical means of the present invention for solving this technical problem is a tractor body 5
The driver's seat 14 is provided at the rear of the tractor, and a pair of left and right columns 75 behind the driver's seat 14 is provided in the tractor in which a pair of left and right columns 75
The point lies in that the external hydraulic take-out device 1 is provided between them.

The second technical means of the present invention is that the operation lever 76 of the external hydraulic pressure take-out device 1 is provided on the right side of the driver's seat 14 and the operation lever 76 is connected to the spool of the external hydraulic pressure take-out device 1 via the cable 64. 62.
Therefore, when a work machine is mounted behind the tractor body 5, to supply hydraulic pressure to the work machine from the external hydraulic take-out device 1, the external hydraulic take-out device 1 and the work machine mounted behind the tractor body 5 must be connected. The piping between them can be short, and installation of the piping becomes easy. Further, the space on the side of the driver's seat 14 is not narrowed by the external hydraulic pressure extracting device 1,
Mounting of various operation levers on the side portion of the driver's seat 14 is also facilitated.

An operation lever 76 is provided on the right side of the driver's seat 14.
Therefore, a normal right-handed operator can easily operate the work machine, the connection between the operation lever 76 and the spool 62 is simplified, and the other operation levers can be provided side by side.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a two-axis, four-wheel tractor, in which the tractors are the left and right front wheels. And a rear wheel 4 on the left and right. The front wheel is a steerable wheel and is drivable. Here, a four-wheel drive tractor is used. Drive).

The tractor body 5 is constructed by connecting a transmission case 7 to a rear portion of a mounted engine via a clutch housing, and the engine and engine accessories such as a radiator provided in front of the engine are provided with a top plate. It is covered with a hood that can be freely opened and closed. A hydraulic lifting device 10 having left and right lift arms 9 is mounted on the rear upper surface of the tractor body 5. As shown in FIGS. 8 and 12, a top link 16 shown in FIG. The rotary work machine 12 can be lifted and lowered by a three-point link mechanism 11 having the following.

The left and right rear wheels 4 are covered by rear wheel fenders 13 erected inside thereof, and a driver's seat 14 is disposed between the left and right rear wheel fenders 13 at the rear of the tractor body 5. ing. A steering handle 15 is provided in front of the driver's seat 14. The head portion 10A of the hydraulic lifting device 10 is covered from above by a floor seat 22, and a driver's seat 14 is mounted on the floor seat 22.

The tractor has a canopy (shade) 74 which is a low-pass, and the draft control valve device is mechanical (manual). A pair of right and left columns 75 of the canopy 74 are provided behind the driver's seat 14, and each pair of right and left columns 75 includes a lower column 75 </ b> A standing upright from the left and right rear axle housings 25 to near the upper surface of the fender 13. It is inserted into the upper part of the lower support 75A in a nested configuration so that it can be inserted and removed, and the bolt fastener 75C
And the upper support 75B mounted by the above. An external hydraulic take-out device 1 described below is provided between a pair of left and right columns 75 behind the driver's seat 14.

Referring to FIGS. 5 to 7, an external hydraulic take-out device 1 is mounted on a hydraulic elevating device 10 having left and right lift arms 9. A plurality of valves 35 for extracting hydraulic pressure are stacked. A hydraulic housing (hydraulic cylinder main body) 33 constituting the hydraulic elevating device 10 is provided with an oil passage 34 for taking out an external hydraulic pressure, and a valve 35 for taking out the external hydraulic pressure which is connected (communicated) to the oil passage 34 is provided. , Provided between the left and right lift arms 9 above the hydraulic housing 33.

More specifically, the hydraulic housing 33
Is made of a casting, and a mounting hole 36A for the transmission case 7 is formed in the pedestal portion 36, and the arm shaft 38 for the lift arm 9 is turned around the rear left and right walls of the main body portion 37 formed in the pedestal portion 36. Left and right bosses 39 are movably supported, and a cylinder tube 40 is provided in the front inside of the main body 37 so as to be inclined upward and forward. A piston is slidably fitted to the cylinder tube 40. The opening end of the tube 40 is closed by the head lid 41, and the pedestal portion 36 in a state where the hydraulic housing 33 covers the upper opening of the transmission case 7 is mounted detachably with vertical bolts. I have.

An inlet (main) port 42 for hydraulic oil from the hydraulic pump device 32 is formed on a side wall (right side wall in the figure) of the hydraulic housing 33.
Numeral 2 has a substantially threaded pipe configuration, and a pipe can be detachably connected to the port 42. The hydraulic housing 33 includes a draft control valve device 43 and a horizontal control valve device 4.
The oil passage 45 for these valve devices 43 and 44, the priority valve 4
6, while the relief valve 47 and the like are mounted,
When a front loader is mounted on the tractor, a hydraulic take-out port 48, a neutral port 49, a drain port 50, and the like for the loader are provided.

The draft control valve device 43 is an electromagnetic pilot valve in which an ascending and descending solenoid valve and a pilot switching valve are integrated, and receives signals from a draft sensor 51 and a lift arm sensor 52 as shown in FIG. The draft control is automatically enabled by a control signal from the control box 53.

The horizontal control valve device 44 transmits a signal of a rolling sensor 54 provided in the tractor body 5 shown in FIG.
The lift cylinder (lift rod) 55 is controlled by a signal from a stroke sensor 56 or the like. In FIG. 8, the control box 53 can be set and switched freely from a switch box 57 such as draft / horizontal control switching, draft control, and position control. Of course, the draft / position control can also be operated manually as described later. For this reason, a mounting hole for manual operation is opened on the right side of the hydraulic housing 33, and this opening is covered with a removable cover when automatic control (auto draft control) is performed.

The lift arm 9 is formed with a mounting hole 9A (see FIG. 1) for a telescopic hydraulic cylinder (assist cylinder) for lifting force (assisting hydraulic pressure enhancement). An outlet 58 is formed in the cylinder head 41, and a drop adjusting valve 59 is incorporated in the head 41. The valve 35 for taking out the external hydraulic pressure is configured by including a switching spool 62 in a valve case 61, and the spool 62 includes a swing arm 63.
Can be switched by the operating force of the push-pull cable 64 through the hydraulic pull-out unit (including the hydraulic pull-out and return) 3
5A is constituted by a quick coupler which makes the hydraulic take-out hose detachable substantially.

The valve 35 for taking out the external hydraulic pressure (including the valve case and the spool, the same applies hereinafter) can be directly mounted on the upper surface of the hydraulic housing 33 in communication with the oil passage 34. Connecting oil passage 6 communicating with passage 34
Hydraulic housing 3 with spacer 60 having
3 Removably mounted on the upper part. Also, the valve 35
May be mounted, but in the illustrated example, a plurality of them are vertically stacked via an intermediate spacer 65 and a head spacer 66, and are detachably mounted by bolts 67. At the rear, which makes it easy to attach and detach the hydraulic outlet hose.

Since the oil passage 34 for the valve 35 for taking out the hydraulic pressure is formed in the hydraulic housing 33,
No exposed piping is required, and when stacking the spacer 60 and the intermediate spacer (there is also an oil passage) 65, it is possible to reliably prevent oil leakage by ensuring the positioning and sealing of the overlapped surface. Since the lift arm 9 is provided between the left and right lift arms 9, the lifting operation of the lift arm 9 does not interfere with the hydraulic take-out hose.

As shown in FIG. 12, behind the tractor body 5, a rotary working machine is provided via a three-point link mechanism 11 having a top link 16 for connecting the rotary working machine 12 and a pair of left and right lower links 17. 12 and the lower link 17 thereof is connected to the lift arm 9 of the hydraulic lifting device 10 via the lift rod 18, whereby the lift arm 9 is swung upward. A rotary work machine 12 is mounted on the rear of the tractor body 5 so as to be able to move up and down. Also, the tractor body 5
PTO shaft 19 on the side and the input shaft 2 on the rotary work machine 12 side
And 0 by a universal joint 21,
The power of the tractor body 5 is transmitted to the rotary work machine 12.

As shown in FIGS. 5 and 6, the hydraulic housing 33 is provided with a top link mount 87 on its rear surface. The hydraulic housing 33 and the top link mounting base 87 are integrally formed by casting. The top link 16 is swingable about a left and right axis 91 via a torsion bar (a load sensing member, which is a draft sensor) 68, a top link mounting member 90 having a cylindrical body 88 and a pair of left and right brackets 89. Are linked.

Therefore, the top link mounting base is formed separately from the hydraulic housing 33 of the hydraulic elevating device 10 and is mounted on the rear surface of the transmission case 7 of the tractor body 5 in a rearward projecting manner. There is no need to tighten and fix the base 87 to the tractor body 5 using bolts and nuts, etc., so that the work of attaching the top link mounting base 87 to the tractor body 5 is eliminated, and the tractor body of the top link 16 is also eliminated. Since the mounting position on the fifth side is located at the upper side, the top link 16 approaches a horizontal state as shown in FIG.
When the rotary working machine 12 is lifted upward through the three-point link mechanism 11 by swinging the lift arm 9 of the hydraulic lifting device 10 upward, an angle β1 formed between the PTO shaft 19 and the universal joint 21 is expressed by: Input shaft 20
Β2 formed between the PTO shaft 19 and the rotary work machine 1 are substantially equal to each other.
Universal joint 2 connecting the input shaft 20
It is possible to prevent large vibration and noise from being generated in one portion.

The tractor body 5 of the top link 16
Since the mounting position on the side is located above the transmission case 7, the rearward projecting amount of the top link mounting base 87 can be shortened. As a result, the rotary working machine 12 can be moved by the tractor body 5. The tractor, including the work implement, can be mounted closer to the tractor, so that the front-rear width of the entire tractor can be made shorter.

Further, since the oil supply plug A for the hydraulic oil for the transmission case 7 is provided, the valve 35 is mounted on one side in the left and right direction, as shown in FIGS. Three-point link mechanism 1
When the actuator 1 is moved up and down, interference with the valve 35 is reduced, and as a result, the lift angle of the three-point link mechanism 11 (the left and right lift arms 9) is sufficiently ensured.

As shown in FIGS. 9 to 11, the valve 35 for taking out the external hydraulic pressure stacked on the hydraulic housing 33 is remotely controlled by a Bowden cable 64.
The remote control lever 76 is provided on the right side of the driver's seat 14 on the floor seat 22 via a horizontal pivot shaft 77. The remote control lever 76 has a window 102 formed on a step portion (rise surface) 22C of the floor seat 22. The lever 76 protrudes from the window 102.

A bracket 78 is bolted to the step 22C so as to reinforce the left and right sides of the window 102 of the step 22C, and the bracket 78 is provided with a pivot 77.
The cylindrical portion 103 at the root of the lever 76 is rotatably fitted on the pivot shaft 77, and the arm portion 10 formed on the cylindrical portion 103 is formed.
4, a cable 64 is connected via a mounting pin 105 and a U-shaped bracket 79. The cable 64 extends from the right side above the hydraulic housing 33 to the left side, bypassing the rear of the driver's seat 14. ing.

The pivot shaft 77 is attached to the bracket 78 with the mounting hole 1.
06 and 107, and a fixing piece 108 protruding from one end of the pivot shaft 77 is fastened and fixed to the bracket 78 with a bolt nut 109, whereby the pivot shaft 77 is fixed to the bracket 78. ing. Both ends of the bracket 78 are respectively fastened and fixed to a pair of left and right mounting brackets 111 by bolt nuts 110, and the pair of mounting brackets 111 are tightened and fixed to the step 22 </ b> C of the floor sheet 22 by bolt nuts 112.

As shown in FIGS. 2 and 4, manual operation (manual operation) is performed instead of the automatic draft control device.
A hydraulic control lever device 80 is provided. The lever device 80 includes a position lever 81 and a draft lever 82, and has an opening formed on the right side of the hydraulic housing 33 (slightly behind the automatic draft control valve). A support arm 84 which inserts and supports a control shaft 83 having an inner / outer double shaft in a closed state is projected rightward and outward, and the control shaft 83 is rotated by front and rear operations of levers 81 and 82, It controls a valve provided in the hydraulic housing 33.

[0029]

According to the present invention, hydraulic piping to the working machine 12 mounted behind the tractor vehicle body 5 can be facilitated. Mounting of various operation levers on the side portions of the driver's seat 14 becomes easy. In addition, the operation lever 7 of the external hydraulic take-out device 1
Since 6 is located on the right side of the driver's seat 14, a normal right-handed operator can easily operate the work machine. Moreover, the operation lever 76
However, the connection between the operation lever 76 and the spool 62 is simpler than the connection by a link because the connection is made to the spool 62 of the external hydraulic pressure take-out device 1 via the cable 64, and the other operation levers are arranged side by side. It ’s easy to set up,
From this point, the operation of the work machine or the tractor becomes easier.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor showing one embodiment of the present invention.

FIG. 2 is a side view of a rear portion of the tractor.

FIG. 3 is a plan view of a rear portion of the tractor.

FIG. 4 is a rear (rear) view of the tractor.

FIG. 5 is a side view of the hydraulic lifting device.

FIG. 6 is a plan view of the hydraulic lifting device.

FIG. 7 is a rear view of the hydraulic lifting device.

FIG. 8 is a configuration diagram of the hydraulic circuit.

FIG. 9 is a plan sectional view of a mounting portion of the operation lever.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

FIG. 11 is a sectional view taken along the line BB of FIG. 9;

FIG. 12 is a schematic view of the three-point link portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 external hydraulic take-out device 2 tractor 5 tractor body 14 driver's seat 62 switching spool 64 push-pull cable 74 canopy (lops) 75 column 76 remote control lever

Claims (2)

[Claims] A driver's seat (1) is provided at the rear of a tractor body (5).
4) and a pair of left and right columns (75) behind the driver's seat (14) are provided between the pair of right and left columns (75) behind the driver's seat (14). And a tractor provided with an external hydraulic take-out device (1). An operation lever (76) of the external hydraulic pressure take-out device (1) is provided on the right side of the driver's seat (14), and the operation lever (76) is connected to the external hydraulic pressure take-up device (1) via a cable (64). The tractor according to claim 1, wherein the tractor is connected to a spool (62).