JP2003080964A - Pto operation device in tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain correct operability by composing a PTO lever in a tractor in simple layout constitution. SOLUTION: In this PTO operation device for a tractor, a rear PTO lever 2 to operate a rear PTO 1 for driving a work machine mounted at a rear part of a car body and a mid PTO lever 4 to operate a mid PTO 3 for driving a work machine mounted at a middle part of the car body are journaled on the same lever shaft 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a PT for a tractor.
Regarding the O operating device, the PTO transmission is turned on and off.

[0002]

2. Description of the Related Art A rear PTO for transmitting a working machine mounted on a rear portion of a tractor body and a mid PTO for transmitting a working machine mounted on a middle abdomen are arranged in a mission case section to operate each of the rear and mid PTOs. Each operating lever
In general, the PTO clutch gears and the like are arranged at positions near the driver's seat that are easy to operate, respectively.

[0003]

In the tractor vehicle body, in addition to the main and sub gear shift levers, the lifting lever for operating the working machine mounted on the vehicle body and the PTO for transmitting the same are also provided.
Many operation levers such as a clutch PTO clutch lever and a PTO shift lever are provided. Therefore, the arrangement of the operation lever is complicated, and the operability is made difficult. Moreover, in a configuration in which a plurality of PTOs are arranged in the same mission case, such as the rear PTO and the mid PTO, or near the lower part of the driver's seat, the operation configuration and operability are further complicated. The present invention eliminates such a defect.

[0004]

According to a first aspect of the present invention, there is provided a rear PT for transmitting a working machine mounted on a rear portion of a vehicle body.
A tractor characterized in that a rear PTO lever 2 for transmitting and operating O1 and a mid PTO lever 4 for transmitting and operating a mid PTO 3 for transmitting a working machine mounted in the middle of the vehicle body are pivotally supported on the same lever shaft 5. The configuration of the PTO operating device of

The rear PTO lever 2 and the mid PTO lever 4 are arranged on the same lever shaft 5. When the working machine is mounted on the rear part of the vehicle body, the work machine is transmitted via the rear PTO 1, so that the working machine can be transmitted by operating the rear PTO lever 2. Also, when the work machine is installed in the middle of the vehicle body, the mid PTO3
The work machine can be transmitted by operating the mid PTO lever 4.

According to a second aspect of the present invention, a toggle that causes the PTO clutch lever 7 for operating the PTO clutch 6 to be resiliently ejected more strongly on the entry side than on the cut side while the dead center is exceeded by the rotation operation of the PTO clutch lever 7. A PTO operating device for a tractor is characterized in that a spring 8 is provided.

When the transmission of the working machine mounted on the vehicle body is turned on and off, the PTO clutch lever 7 is operated to turn the PTO clutch 6 on and off. When the PTO clutch lever 7 is rotated, the PTO clutch lever 7 end side of the toggle spring 8 is simultaneously moved, and the elastic force of the toggle spring 8 stably maintains the engaged position and the disengaged position of the PTO clutch lever 7. Let When the PTO clutch lever 7 is rotated, the elastic force of the toggle spring 8 works stronger on the entry side of the PTO clutch 6 than on the disengagement side to prevent the clutch from coming off when the PTO clutch 6 is engaged.

According to a third aspect of the present invention, the lever bracket 9 for axially mounting the PTO clutch lever 7 is provided with the P
An engine restraint switch 10 for restraining the engine start when the TO clutch lever 7 is in the engaged position and the toggle spring 8 are provided.

The PTO clutch lever 7 is operated to operate the PTO.
With the clutch 6 turned on and off, the work machine can be transmitted or stopped. When the engine of the tractor is started, if the PTO clutch lever 7 is in the on position, the engine check switch 10 operates and the engine is not started. When the PTO clutch lever 7 is in the disengaged position, the engine is started because the check by the engine check switch 10 does not work. When attaching / detaching such a PTO clutch lever 7, the lever bracket 9 is attached / detached to / from the machine body or the transmission case by bolting or the like. It can be installed by sub-assembling.

According to a fourth aspect of the present invention, a hydraulic PTO clutch 6 and a PTO clutch valve 1 for opening and closing the hydraulic PTO clutch 6 are provided.
1 is provided in the mission case 12, and an interlocking mechanism that interlocks the PTO clutch valve 11 and the PTO clutch lever 7 with a lower inside of a lever guide 13 that guides a PTO clutch lever 7 that operates the PTO clutch valve 11. It is characterized in that 14 is provided.

When the PTO clutch lever 7 is rotated along the lever guide 13, the PTO clutch valve 11 in the transmission case 12 is moved through the interlocking mechanism 14.
Is operated to switch the PTO clutch valve 11, the hydraulic PTO clutch 6 is turned on and disengaged.

[0012]

As described above, the rear PTO lever 2 and the mid PTO lever 4 are arranged on the same lever shaft 5, so that the lever shaft 5 is shared. It can be simplified, and the positions of the PTO levers 2 and 4 and the operation range can be brought close to each other to narrow the installation range and the operation range. With a simple structure, it is possible to maintain accurate PTO operability.

According to the second aspect of the present invention, the PTO clutch 6 is stable because the clutch disengagement is prevented even if the machine body swings, vibrates, or changes in power transmission occur during transmission of the working machine. The power of transmission can be maintained. Moreover, since the clutch disengagement is prevented only by the elastic form of the toggle spring 8, the structure can be simplified.

According to the third aspect of the present invention, the PTO clutch lever 7 is attached / detached to / from the lever bracket 9 sub-assembled with the engine start check / control switch 10, the toggle spring 8 and the like.
These PTO clutch levers 7
It is possible to easily assemble and adjust the engine start restraint switch 10 and the toggle spring 8 and to simplify the mounting structure.

According to a fourth aspect of the present invention, a hydraulic pressure PT is provided.
Since the O-clutch 6 and the PTO clutch valve 11 are arranged in the mission case 12, the hydraulic circuit configuration can be simplified, leakage of oil from the hydraulic circuit to the outside of the machine can be eliminated, and the PTO clutch lever can be used. 7 and PTO clutch valve 11 interlocking mechanism 1 interlocking
Since 4 is arranged inside the lower part of the lever guide 13, the structure can be simplified and the assembling and adjustment can be facilitated.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. The schematic construction of a small tractor vehicle body is mainly composed of a pair of left and right main frames 17 in the form of a thick plate, a front axle housing 18 is supported in the front by way of a center pivot shaft 19, and a mission case 12 is in the rear. Mounting. This front axle housing 1
A steering case 23 having a front wheel shaft 22 having a front wheel 21 is provided on each of the left and right sides of the steering wheel 24.
It is provided so that it can be steered. Also, mission case 12
Rear wheels 27 are provided on the rear axle 26 of the rear axle housing 25 on the left and right sides of the rear axle 26.

The engine 20 is mounted on the front part and is covered with a hood 29. A control floor 40 is provided on the rear side of the dashboard 39, and a driver's seat 50 is provided on the rear side above the mission case 12. Fender 5
1 covers the rear wheels 27 on both left and right sides of the mission case 12. A vertical rear frame 52 is connected to the rear end of the main frame 17, and a gate-shaped safety frame 28 is attached to the upper end on the left and right.

A hydraulic case 53 is integrally provided on the upper side of the mission case 12, and a lift shaft 31 of a lift arm 30 is pivotally supported. The upper parts of the left and right rear frames 52 are connected by a connecting frame 32. 33 is a link bracket to which the top link 34 is attached. The lower frame 35 is connected between the lower end portions of the rear frame 52. A lower link shaft 36 is provided on the upper side of the lower frame 35, a lower link 37 is attached to the lower frame 35, and the lower arm 35 is connected to the lift arm 30 by a lift rod 38. By lifting and lowering by the hydraulic pressure of
The working machine mounted between the rear ends of the top link 34 and the lower link 37 can be moved up and down. It constitutes a so-called three-point link mechanism.

The transmission by the engine 20 is driven by the interlocking shaft 4
The input shaft 41 of the HST 54 on the front side of the transmission case 12 is interlocked via the transmission shaft 2, and the rear wheel shaft 26 is transmitted from the HST 54 via the transmission mechanism and the differential gear in the transmission case 12. The front axle housing 18 is connected to the front wheel output shaft 43 below the input shaft 41 through the interlocking shaft 44.
To transmit the front wheel shaft 22. A rear PTO shaft 45 is provided on the rear side of the mission case 12 so that a work machine mounted on the rear part such as a rotary tiller connected to a three-point link mechanism can be transmitted. Further, a mid PTO shaft 46 is provided on the front side of the mission case 12 so that the blade shaft 48 of the mower deck 47 mounted on the abdomen can be transmitted through the interlocking shaft 55 as shown in the figure.

A seat bracket 49 is mounted and supported on the upper side of the hydraulic case 53, a fuel tank 95 for accommodating fuel for the engine 20 is mounted, and the driver seat 50 is supported on the seat bracket 49. The fenders 51 are arranged on both left and right sides of the driver's seat 50, and lever guides 13 and 56 are formed on the upper side of the driver's seat 50. The lever guides 13 on the left hand side in the forward direction are connected to the PTO clutch lever 7 and the rear PTO. The lever 2, the mid PTO lever 4, etc. are arranged, and the lever guide 56 on the right hand side has a 2WD / 4WD switching lever 57, an auxiliary shift lever 58, and a lift lever 59.
And so on.

Of these, the PTO clutch lever 7 is used to turn on and off the multi-plate hydraulic type PTO clutch 6 provided at the rear end of the input shaft 41 of the HST 54, and is attached to the left-hand side surface of the mission case 12. The clutch valve 11 is connected via an interlocking mechanism 14 including a link mechanism. The PTO clutch lever 7 is detachably attached to the inside of the fender 51 and the lever guide 13 on the driver's seat 50 side by tightening a bolt 60 with a lever bracket 9.

The lower end of the PTO clutch lever 7 is
A toggle spring 8 is hung between a lever arm 62 that is rotatably supported by a lever bracket 9 by a lever shaft 61 and is integral with the PTO clutch lever 7, and a spring pin 63 at a fixed position of the lever bracket 9. When the PTO clutch lever 7 is rotated, the dead point is exceeded, and the PTO clutch lever 7 alternately springs toward the clutch engagement position A and the disengagement position B to stabilize each operation position. The spring interval between the tip of the lever arm 62 that engages both ends of the toggle spring 8 and the spring pin 63 is larger than the spring interval LA at the engaged position A of the PTO clutch lever 7 than the spring interval LB at the disengaged position B. Then (LA> LB)
It is set. Therefore, the PTO clutch lever 7 is set to P
The TO clutch 6 is strongly ejected to the entry position A side, and PT
It is possible to stabilize the engaged state of the O-clutch 6 and prevent the clutch from coming off.

At the space between the left-hand side surface of the mission case 12 and the outer fender 51, the PT
A link rod 65 is connected to an interlocking arm 64 that is integral with the base of the O-clutch lever 7, and the link rod 65 is
The interlocking mechanism 14 is configured to be connected to the valve arm 67 provided on the valve shaft 66 of the TO clutch valve 11 so that the PTO clutch valve 11 can be switched by rotating the PTO clutch lever 7.

The lever arm 6 of this lever bracket 9
An engine restraint switch 10 composed of a micro switch is attached to the rotation position of 2. This engine check switch 10 is turned on at the entry position A of the PTO clutch lever 7.
Then, the start of the engine 20 is restrained to the disabled state via the controller. 68 is a hydraulic pipe connected to the PTO clutch valve 11.

The rear PTO lever 2 is fixed to the end of the lever shaft 5 on the upper left side of the transmission case 12.
The lever shaft 5 has a shifter arm 72, and a rear PTO clutch gear 7 on the transmission shaft 69 of the rear PTO 1 is provided.
You can operate 0. This rear PTO clutch gear 70
From the input shaft 41 to the PTO clutch 6 and the output gear 71
The rear PTO shaft 45 can be transmitted by being engaged with the clutch gear 73 that is rotated via the. This rear PTO
The lever 2 rotates to the front side and the rear PTO clutch gear 70
Is disengaged from the clutch gear 73 and is in the disengaged position C, and is rotated rearward to the engaged position D.

From the clutch gear 73 on the transmission shaft 69 of the rear PTO 1 to the mid PTO clutch gear 76 of the mid PTO 3 via the counter gear 74 and the clutch gear 75.
And the shifter arm 77 pivots to move this mid PTO
By operating the clutch gear 76 along the mid PTO shaft 46, the mid PTO clutch gear 76 can be engaged with the clutch gear 75 to transmit the mid PTO shaft 46. The shifter arm 77 is located below the lever shaft 5 and is integral with the arm 79 at the outer end of the shifter shaft 78 of the shifter arm 77 and the mid PTO lever 4 rotatably mounted on the lever shaft 5. The link rod 81 is connected to the arm 80. The operation phase positions of the mid PTO lever 4 and the rear PTO lever 2 are set to be shifted forward and backward so as not to interfere with each other. When the mid PTO lever 4 is rotated to the front side, the mid PTO clutch gear 76 is set to the disengaged position E, and when it is rotated to the rear side, the engaged position F is set.

The rear PTO lever 2 and the mid PTO
The lever shaft 5 for mounting the lever 4 is the mission case 1
Metal cover 16 for opening and closing the opening 15 on the left-hand side of 2
The metal cover 16 is rotatably supported by and is detachable by bolting. Similarly, the shifter shaft 78 of the mid PTO clutch gear 76 which is interlocked from the lever shaft 5 side is also pivotally supported on the metal cover 93 so that the opening 94 of the metal cover 93 can be opened and closed and mounted by bolting. To be

In the HST 54, the rotation of the input shaft 41 is transmitted to the output shaft 83 in a continuously variable manner by the turning operation of the control shaft 82 which is interlocked with the gear shift petal provided on the upper surface of the control floor 40, and is transmitted to the neutral position. Continuously variable transmission can be performed from the stopped state to the speed increasing state of the forward rotation and reverse rotation positions. A traveling pinion shaft 86 is transmitted from the output shaft 83 via a counter gear 84 and an auxiliary transmission gear 85 meshed with the counter gear 84.
The pinion shaft 86 is transmitted to the rear wheel shaft 26 via the differential gear 87, the clutch gear 88 on the front wheel output shaft 43 is transmitted, and the four-wheel drive clutch gear 89 is engaged with the clutch gear 88 to output the front wheel output. The front wheel 21 can be driven by transmitting the shaft 43.

Auxiliary shift lever 58 of the lever guide 56
Then, by operating the sub-transmission gear 85, the counter gear 84 is meshed and selected to transmit the high-speed and low-speed sub-transmission travel. In addition, the 2WD / 4WD switching lever 57 engages the 4WD clutch gear 89 with the clutch gear 88 to drive the front wheels 21 and the rear wheels 27, and the 4WD clutch gear 89 does not engage. Thus, it is possible to switch to the two-wheel drive state in which only the rear wheels 27 are driven.

Reference numeral 90 denotes a hydraulic pump which is transmitted from the input shaft 41 via a gear 91, and can send hydraulic pressure to the lifting cylinder 92 in the hydraulic case 53 and the hydraulic circuits such as the PTO clutch 6 and the HST 54. The lifting lever 5
9 operates the lift control valve of the lift cylinder 92,
This lift cylinder 92 is hydraulically operated to lift the lift shaft 31.
The lift arm 30 can be rotated up and down around it.

[Brief description of drawings]

FIG. 1 is a front view of an operating device section of a tractor.

FIG. 2 is a side view of the tractor.

FIG. 3 is a plan view thereof.

FIG. 4 is a side view of the PTO lever portion.

FIG. 5 is a side view of the PTO clutch lever portion.

FIG. 6 is a plan view thereof.

FIG. 7 is a transmission mechanism diagram of the mission case PTO unit.

FIG. 8 is a transmission mechanism diagram of a traveling transmission unit of the mission case.

[Explanation of symbols]

1 rear PTO 2 Rear PTO lever 3 Mid PTO 4 Mid PTO lever 5 lever shaft 6 PTO clutch 7 PTO clutch lever 8 toggle spring 9 Lever bracket 10 Engine check switch 11 PTO clutch valve 12 mission case 13 Lever guide 14 interlocking mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3D043 AA05 AA10 AB12 AB17 BA01                       BA06 BA07 BC02 BC07 BC16                       BD01 BD05 BF02 BF05 BF07                       BF08                 3J070 AA03 BA15 BA16 BA32 BA34                       BA36 BA71 CB11 CC04 CC07                       DA03 EA31

Claims (4)

[Claims] 1. A rear PTO lever 2 for transmitting and operating a rear PTO 1 for transmitting a work machine mounted on a rear portion of a vehicle body,
Mid PTO for transmitting work equipment mounted in the middle of the vehicle body
A PTO operating device for a tractor, characterized in that a mid PTO lever 4 for transmitting operation of 3 is pivotally supported on the same lever shaft 5. 2. A PTO clutch lever 7 for operating the PTO clutch 6 is provided with a toggle spring 8 that elastically squeezes more strongly on the entry side than on the cut side while the dead center is exceeded by the turning operation of the PTO clutch lever 7. Characteristic tractor PTO operating device. 3. A lever bracket 9 for pivotally mounting the PTO clutch lever 7 is provided with an engine restraint switch 10 for restraining an engine start when the PTO clutch lever 7 is in an engaged position, and the toggle spring 8. The tractor PTO operating device according to claim 2. 4. The transmission case 1 includes a hydraulic PTO clutch 6 and a PTO clutch valve 11 for opening and closing the hydraulic PTO clutch 6.
2, inside the lever guide 13 that guides the PTO clutch lever 7 that operates this PTO clutch valve 11, these PTO clutch valve 11 and PTO
4. The tractor PTO operating device according to claim 2, further comprising an interlocking mechanism 14 interlocking with the clutch lever 7.