JPH11105564A - Operating device for tractor or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a control valve and make the control valve light in weight by separately operating and hydraulically actuating each of a PTO clutch and a lift arm by using the control valve by the same spool. SOLUTION: A control valve 8 has the form of a spool valve 2 which is switched and operated by the operations of levers 1, 5. By the push and pull A of this spool 2, a main circuit of a lift cylinder can be switched from a neutral location to a lifting location and a lowering location. By the rotation B of the spool 2 at this neutral location, an off location communicating a clutch cylinder port with a tank port and an on location communicating the clutch cylinder port with a PTO circuit can be switched. Thus, the spool 2 is rotated in the operation of the PTO clutch lever 1 and a PTO clutch is operated by a hydraulic circuit, and the spool 2 is pushed and pulled in the spool shaft direction in the operation of the lift lever 5 and a lift arm is operated by the hydraulic circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for raising and lowering a tractor mower working machine and the like and transmitting power.

[0002]

In the case of a tractor or a combine, a hydraulic circuit such as a lift cylinder for elevating and lowering the working machine unit and a PTO clutch for transmitting the working machine unit has different operating configurations. In order to hydraulically operate the lever and the hydraulic cylinder, the control valve or spool valve for control is arranged in the hydraulic circuit as a separate configuration, and the configuration is complicated and the weight tends to increase.

[0003]

According to the present invention, the spool 2 is rotated by operating the PTO clutch lever 1 to switch the hydraulic circuit 4 of the PTO clutch 3 and the lift lever 5
The operation of a tractor or the like provided with a control valve 8 for switching the hydraulic circuit 7 of the lift arm 6 by pushing and pulling the spool 2 by the operation described above.

[0004]

The spool 2 is rotated by the operation of the PTO clutch lever 1, the PTO clutch 3 is operated by the hydraulic circuit 4, and the operation of the lift lever 5 causes the spool 2 to rotate.
Is pushed and pulled in the spool axial direction, and the lift arm 6 is operated by the hydraulic circuit 7. Thus, the PTO clutch 3
The lift arm 6 is separately operated and hydraulically operated by using the same control valve 8 with the same spool 2, so that the configuration of the control valve 8 can be simplified and reduced in weight.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 48 has a clutch housing 10, a spacer case 33, and a transmission case 11 connected to a front side of an engine E below a rear hood 9;
The front axle bracket 12 at the rear of the engine E
Axle housing 3 with rear wheel 13 at the bottom of
The front wheel 15 is mounted on the outside of the front axle housing 14 outside the front part of the transmission case 11.

Reference numeral 50 denotes a rear wheel transmission shaft interlocked with the rear wheel 13. Reference numeral 16 denotes a steering handle, which is configured to steer the rear wheel 13 via a power steering including an orbit roll 42 and a power steering cylinder 41. 1
8 is a cockpit. A lift arm 23 is provided at a front portion of the vehicle body 48, and is vertically moved by expansion and contraction by hydraulic pressure due to expansion and contraction of a lift cylinder 43, and is connected to a front portion of the vehicle body 48 via a lift rod 20. 21 is raised and lowered. The mower 22 is connected as a working machine which is raised and lowered by the vertical movement of the lift arm 23.

In the power steering, the power steering circuit 25 has an orbit roll 42 having a five-port configuration, and the hydraulic pump P passes through the power steering circuit 25 and passes between the main circuit 37 having a lift control valve 45.
A power steering surplus flow circuit 24 is connected so that the surplus flows from the power steering relief R1 and the power steering merge. In addition, the power steering return circuit 26 joins the PTO circuit 27 at the clutch engagement port of the PTO clutch valve 46.

The PTO circuit 27 and the main circuit 37 are joined by a relief circuit 28 having a main relief R2, and are joined by a circuit 38 at a neutral or lower port of the lift control valve 45. In this way, the oil supplied to the control valve 45 and the oil supplied to the PTO clutch valve 46 respectively merge and are supplied to the HST charging circuit 47 of the HST via the HST supply circuit 29 via the low pressure relief R3. HST relief R4 inside this
Through the tank port T.

[0009] The pressure of the circuit 27 in the control valve 8 is set to the set value of the low-pressure relief R3 (for example, 5 kgf /
cm ² ), the HST relief pressure (5 kgf / cm ² ) of the HST charge circuit 47 is applied, and a constant pressure (1 kg / cm ² ) is applied.
0 kgf / cm ² ). With this pressure,
The on / off control of the PTO clutch 3 and the back pressure control of the lift cylinder 43 of the mower 22 can be performed. This P
In the control of the TO clutch cylinder 44, the oil flow is required only when the hydraulic pressure is sent into the cylinder 44 and the PTO clutch 3 is turned on, but thereafter, the oil flow is not necessary and is supplied to the HST supply circuit 29. .

When lowering the mower 22,
The lowering circuit 30 of the lift cylinder 43 communicates with the tank port T via the clutch cylinder port 31 of the PTO clutch 3, and when the PTO clutch valve 46 is lowered when the PTO clutch valve 46 is turned off, a normal lowering is performed. When it descends with the state of 6, the communication with the tank port T is cut off, and the communication with the PTO circuit 27 starts.

In such a hydraulic circuit, the relief valves R1 to R3 and the power steering return circuit 26 are all configured to supply hydraulic pressure to a lower circuit.
No matter which relief R1 to R4 works, the function of the hydraulic circuit is not impaired. Thus, the capacity of the hydraulic pump P can be reduced, pressure loss and horsepower loss can be reduced, and heat balance performance can be improved.

The wet-type multi-plate PTO clutch 3 operated to be turned on and off by the PTO clutch cylinder 4 has:
The PTO shaft 32 is provided in the transmission system of the transmission case 11.
Turf grass is harvested by transmitting and rotating the blade shafts of the above. The HST is provided in a spacer case 33, has an HST pump 39 and an HST motor 36, has an HST circuit 39, has a charge circuit 47, and has an HST relief R4. As a configuration of a main transmission that switches from a neutral position to a forward position and a reverse position by operating a main transmission lever to increase and decrease the speed, the transmission is for traveling transmission.

The control valve 8 includes levers 1 and 2
5 is a spool valve 2 that is switched by five operations.
The third main circuit 37 can be switched from the neutral position to the raised position and the lowered position. Further, by rotating the spool 2 at the neutral position, the clutch cylinder port 31 can be switched between the off position where it communicates with the tank port T and the on position where it communicates with the PTO circuit 27.

The control valve 8 is disposed on the upper surface of the transmission case 11 below the vehicle body 48. The PTO clutch lever 1 and the lift lever 5 for operating the control valve 8 are disposed near the side of the cockpit 18. You. A bracket 51 integral with the vehicle body 48 is provided with a lever shaft 52 having a lift lever 5 and rotated. A shifter 53 integral with the lever shaft 52 is engaged with a shifter groove 54 at the tip of the spool 2. At the same time, the spool 2 can be moved back and forth A by turning the shifter 53 back and forth. The PTO clutch lever 1 can rotate back and forth around a lever shaft 55, and a spool 56 is integrated with the spool 2 by a link 56.
Can be rotated B.

5 and 6 are different from the above example in that
The radiator 58 is provided below the intake chamber cover 59 in front of the radiator 58 of the engine E mounted on the rear part of the tractor body 48.
The engine E and the radiator 58 are installed as low as possible by providing a detachable lower cover 60 that covers the lower side of the engine, and the intake area of the intake chamber 61 is set to be large.

Reference numeral 62 denotes a radiator fan, 63 denotes a radiator shroud, 64 denotes a hood, 65 denotes a fender of the front wheel 15, and 66 denotes a seat floor. Radiator 5
8 is covered with an intake chamber cover 59 that forms an intake network above the seat floor 66.
The intake chamber cover 59 is formed integrally with the rear bonnet 64 and covers the engine E and is detachable.

The lower cover 60 covers a portion extending from the front side to the lower side of the radiator 58 and the intake chamber 61 below the seat floor 66, and is formed by an intake net. The rear edge 68 is joined to the lower front surface of the radiator shroud 63. Reference numeral 69 denotes a dustproof net inserted into the front of the radiator 58. Reference numeral 70 denotes a cover for covering a transmission shaft 71 interlocking from the engine E to the transmission case 11, and is provided integrally with a lower end of the radiator shroud 63.

7 and 8, the points different from the above example are as follows.
The dustproof net 67 and the lower cover 60 in front of the radiator 58 are integrated into a single unit so as to be inserted and removed.
The configuration and the attaching / detaching operation are simple. In FIG. 9, the difference from the above example is that the mower deck 72 of the mower 22 is configured to be able to hang down with respect to the outer peripheral deck 73 that guides grass collection of the cutting grass on the outer periphery, thereby facilitating maintenance. It is intended. The outer peripheral deck 73 has a mounting bracket 74 for mounting to the connecting arm 21 on the vehicle body 48 side, a support frame 76 for arranging a gauge wheel 75 in front and rear on both left and right sides, and a blade shaft 77 in a central part.
Is formed to position the mower deck 72 on which the shaft is mounted.

The center of the front edge of the mower deck 72, which is positioned so as to fit into the deck hole, is provided so as to be vertically rotatable with respect to the front side of the outer peripheral deck 73 by means of a horizontal deck shaft 78. The mower deck 72 is locked at its rear end central portion by a locking member 79 to maintain the mower deck 72 in the mowing posture. 80 is a blade at the lower end of each blade shaft 77, 81
A gear case on the upper surface of the mower deck 72 has an input shaft 82 and can be transmitted from the PTO shaft 32 on the vehicle body 48 side.
Reference numeral 83 denotes a transmission belt that extends between the blade shafts 77.

When the mower deck 72 is moved downward around the deck shaft 78, the gear case 81, the transmission belt 83, and the like are moved down together with the blade shafts 77. FIG.
11, the difference from the above example is that the lifting pins 84 for lifting the rear part of the mower deck 22 and the mounting pins 87, 88 of the height adjusting link 85 to and from the bracket 86 of the mower deck 22 are inserted and removed. , Moore Deck 22
The switch is made possible or impossible depending on the angles of the lifting link, 84 and the height adjusting link 85 depending on the elevation position of the elevator. The pin connection between the suspension link 84 and the height adjustment link 85 is alternately attached and detached.

When the lift cylinder 43 expands and contracts, the mower deck 22 is raised and lowered by the rotation of the lift arm 6 and the vertical rotation of the connecting arm 21.
The rear end portion 2 is connected to a bracket 89 of the vehicle body 48 by a lifting link 84, and is connected to an extendable height adjusting link 85 which can adjust a lower limit locking position by inserting and removing an adjusting pin 90. You. The mower deck 22 is vertically rotated and its upper limit position, lower limit position, and the like are regulated by the lifting link 84 and the height adjusting link 85.

The mounting pins 87 and 88 of the connecting portion between the lifting link 84 and the height adjusting link 85 and the bracket 86 of the mower deck 22 are formed in a U-shaped curve.
The base has springs 91 and 92 so that the tips 93 and 94 can be fitted into and removed from the pin holes of the bracket 86. The distal ends 93 and 94 are inserted and connected from the pin holes of the lifting link 84 and the height adjusting link 85 to the pin holes of the bracket 86, and are connected and mounted. When detached, it becomes a detached state.

From the U-shaped curved portions of these links 87, 88, stopper arms 95, 96 bent in an elbow shape.
Projecting toward the respective end portions 93 and 94, and the end of each of the stopper arms 95 is provided with an upward stopper 9.
7 is protruded to engage the lifting link 84 in the mounted state. At the tip of the stopper arm 96, a downward stopper 98 is projected, so that the height adjusting link 8 in the mounted state is formed.
5 is engaged.

The relative positions of the stoppers 97 and 98 change depending on the vertical rotation angles of the links 84 and 85. The lower stopper 97 does not engage when the mower deck 22 is at the lower limit position, but can engage when the mower deck 22 is at the upper limit position. The upper stopper 98 can be engaged when it is at the upper limit position U, but is not engaged when it is at the lower limit position D. For this reason, when attaching and detaching the mower deck 22 to and from the lifting link 84 and the height adjusting link 85, these mounting pins 8 are used.
7. Insertion and removal are performed at positions where 7,88 can be attached and detached.

In FIG. 12, the difference from the above example is that the mounting / dismounting configuration of the mounting pin 88 (and 87) is changed between the mounting / dismounting position F and the working position G depending on the angular position of the stopper arm 96 mounted on the mounting pin 88. Rotate to switch. A lock pin 99 is attached to the base of the stopper arm 96 with a spring 100.
As a result, it can be repelled toward the core of the mounting pin 88 and can be fixed by engaging with a locking groove 101 formed on the peripheral surface of the mounting pin 88. Therefore, the stopper 98 of the stopper arm 96 with respect to the height adjusting link 85 can be locked at the upper limit position U during work.

FIG. 13 is different from the above example in that the spring 92 of the mounting pin 88 is provided on the curved portion side so that the distal end portion 94 is always resilient in the direction of coming out of the pin hole of the bracket 86, and this mounting is performed. The retaining pin 102 can be inserted and removed from the base side of the pin 88 to fix the connecting position of the height adjustment link 85 (and the lifting link 84) to the bracket 86. When the height adjusting link 85 is removed, when the retaining pin 102 is removed, a distal end 94 is formed by a spring 92.
Is removed from the pin hole of the link 85.

14 to 17, the point different from the above example is that the connecting portion of the lifting link 84 and the height adjusting link 85 is located inside the bracket 86 behind the mower deck 22.
A swing bracket 104 that rotates back and forth around a horizontal support shaft 103 is provided, and the lower ends of the lifting link 84 and the height adjustment link 85 are connected to the swing bracket 104 by mounting pins 87 and 88. doing. Reference numeral 105 denotes a spring which resiliently moves between the bracket 86 and the swing bracket 104 so as to open upward as shown in FIG.

Each of the mounting pins 87 and 88 has a small diameter at one end, and has arc-shaped pin holes 106 and 107 in the bracket 86.
To guide the swing bracket 104 swingably around the support shaft 103, and a handle 1
08,109. At the lower end of the arc-shaped pin hole 106 and the upper end of the pin hole 107, mounting pins 87, 88 are provided.
End holes 110 and 111 which can be detached by fitting the large-diameter portions on the base side of the base member against the springs 91 and 92 are provided. By pulling out these mounting pins 87, 88 toward the handles 108, 109 against the springs 91, 92,
The distal ends 93 and 94 can be removed from the lower end pin holes of the links 84 and 85.

On the side surface of the swing bracket 104, a semi-cylindrical regulating edge 112, surrounding the springs 91, 92,
A regulating pin 114 is provided on the base side of the mounting pins 87 and 88 so that the regulating pins 114 and 115 are engaged with the regulating edges 112 and 113, and the mounting pins 87 and 88 are pulled outward against the springs 91 and 92. The detached position K can be maintained.
The attachment / detachment operation of each link 84, 85 can be easily performed. When the handles 108 and 109 are pulled outward against the springs 91 and 92 and rotated K, the regulating pins 114 and 115 are engaged with the regulating edges 112 and 113. When operated in reverse, the mounting pins 87 and 88 are pulled back by the springs 91 and 92 and return to the swing bracket 104 side.

[Brief description of the drawings]

FIG. 1 is a perspective view and a side view of a control valve unit.

FIG. 2 is a hydraulic circuit diagram

FIG. 3 is a transmission mechanism diagram of a tractor.

FIG. 4 is a side view

FIG. 5 is a side view of a radiator section showing another embodiment.

FIG. 6 is an exploded perspective view of a part thereof.

FIG. 7 is a side view of a radiator section showing a partially different embodiment.

FIG. 8 is an exploded perspective view of a part thereof.

FIG. 9 is a perspective view of a mower deck showing a partially different embodiment, and a side view showing its operation.

FIG. 10 is a side view of a mower deck showing a partially different embodiment.

FIG. 11 is an enlarged perspective view, a side view, and a rear view of a part thereof.

FIG. 12 is a perspective view of a mower deck part showing another embodiment, and a side view thereof.

FIG. 13 is a perspective view of a mower deck showing another embodiment.

FIG. 14 is a side view of a mower showing another embodiment.

FIG. 15 is an enlarged side view and a perspective view of a part thereof.

FIG. 16 is a side view and a perspective view showing the operation.

FIG. 17 is a side view showing the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PTO clutch lever 2 Spool 3 PTO clutch 4 Hydraulic circuit 5 Lift lever 6 Lift arm 7 Hydraulic circuit 8 Control valve

Claims (1)

[Claims] The hydraulic circuit of the lift arm 6 is operated by operating the PTO clutch lever 1 to rotate the spool 2 to switch the hydraulic circuit 4 of the PTO clutch 3 and operating the lift lever 5 to push and pull the spool 2. An operating device such as a tractor provided with a control valve 8 for switching the operation of the tractor 7.