JPH05169993A - Pto transmission device for tractor - Google Patents

Abstract

PURPOSE:To provide a simple and compact change-over device for normal and reverse rotations of a PTO shaft with the use of an idle gear in a reverser clutch for transmitting power. CONSTITUTION:A reverser clutch is moved between reverser gears 1, 2 on a reverser shaft 3 so as to change over between the forward and backward movements. An idle gear 5 is meshed with the reverser gears 1, 2. A PTO clutch 7 connects and disconnect power transmission to and from a PTO shaft 6. A PTO reverse gear 8 is positioned on the PTO shaft 6 side of the PTO clutch 7, and may be changed over into the reverse transmission of the idle gear 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor PTO transmission.

[0002]

2. Description of the Related Art A power transmission device for a tractor is a power transmission device (PTO) for transmitting a traveling power transmission device for transmitting traveling wheels and a work device mounted on a tractor vehicle body. And have. Moreover, in the form in which each of these transmission devices is provided with a clutch and a transmission direction switching device for switching between normal rotation and reverse rotation is provided, the number of gears in the transmission case increases and the length of the transmission case tends to increase.

The present invention is directed to the positive / negative of this power take-off transmission device.
The switching configuration for reverse rotation transmission is simplified and made compact by utilizing a part of a traveling transmission device capable of forward and reverse transmission.

[0004]

SUMMARY OF THE INVENTION The present invention includes a reverser clutch 4 for moving and engaging the direction of a reverser shaft 3 in which reverser gears 1 and 2 are arranged to switch between forward and reverse travel transmission.
An idle gear 5 that meshes with the reverser gears 1 and 2,
PTO clutch 7 that turns on and off the transmission to the power take-off shaft 6
And a PTO reverse rotation gear 8 on the power take-off shaft 6 side of the PTO clutch 7 which can be switched to reverse rotation transmission from the idle gear 5 side.

[0005]

When the reverser clutch 4 is switched to the reverser gear 1 side by switching the reverser clutch 4 in the front-rear axis direction on the reverser shaft 3, the traveling transmission is set to the forward direction, and , When switching to the reverser gear 2 side, use the reverse direction. These reverser gears 1, 2 are transmitted via an idle gear 5.

Transmission to the power take-off shaft 6 is performed by operating the PTO clutch 7, and switching between forward and reverse rotation is performed by the PT.
This is performed by meshing transmission of the O reverse gear 8. If the direct transmission from the PTO clutch 7 side to the power take-off shaft 6 is forward rotation, switching from the idle gear 5 side to the transmission via the PTO reverse rotation gear 8 will be reverse rotation. As described above, the PTO reverse rotation gear 8 can switch the transmission to the power take-off shaft 6 from the normal rotation transmission via the PTO clutch 7 to the reverse rotation transmission from the idle gear 5 transmitted to the reverser clutch 4. It is possible to rotate / reverse, and by utilizing the transmission of the idle gear 5 on the reverser clutch 4 side for transmission to the power take-off shaft 6, the PTO forward / reverse switching transmission mechanism can be simplified.
The mission case can be made compact.

[0007]

1 to 3, a tractor vehicle body comprises a front engine 9, a clutch housing 10, a front mission case 11, a middle mission case 12, and a rear mission case 13 which are integrally connected. The front wheel bracket 14 below the engine 9 supports the axle housing 16 of the front wheel 15, and the rear mission case 1
3 has axle housings 17 protruding on both left and right sides,
The rear wheels 18 are axially mounted to form a front-rear four-wheel drive mode. 1
Reference numeral 9 is a steering wheel, 20 is a fender, 21 is a cockpit, and 22 is a lift arm.

The clutch housing 10 is provided with a traveling clutch 28, the front mission case 11 is provided with a reverser clutch 4 for switching between forward and reverse travel transmissions, a PTO clutch 7 and the like, and a middle mission case 12 is provided.
Is provided with a main transmission device 23 for traveling transmission, and a speed increasing switching device 24 capable of switching the transmission of the front wheels 15 to increase speed, and the rear transmission case 13 has an auxiliary transmission device for sub-shifting the traveling transmission and front wheels. A front wheel transmission take-out device for taking out power to the gear 15, a differential device transmitted from the sub-transmission device, and a PTO transmission device for changing the speed in the middle of the power take-out shaft 6 are provided.

The clutch housing 10 is partitioned from the inside of the front transmission case 11 by a case partition wall 25, and a clutch shaft 26 which is transmitted from the engine 9 side through a traveling clutch 28, and a clutch shaft 26 of the clutch shaft 26. The drive shaft 27 of the PTO, which is rotatable and is always rotating, is borne on the outer periphery. 29 is a flywheel, 30 is a clutch shifter,
31 is a traveling drive gear at the tip of the clutch shaft 26, 32 is a PT
The PTO drive gear at the tip of the O drive shaft 27 is located inside the front mission case 11.

The reverser shaft 3 and the transmission gear 3 extend from the front mission case 11 to the middle mission case 12.
3 is coaxially mounted, the gear shaft 34, the idle gear shaft 35, and the speed change shaft 36 are coaxially mounted, and the PTO clutch shaft 37 and the power take-off shaft 6 are coaxial. Mounted on the
The front wheel take-out shaft 38 and the front wheel drive shaft 39 are coaxially mounted.

The traveling transmission system includes the traveling drive gear 31 and
The idle gear 40 on the front side of the idle gear shaft 35 always meshes with the idle gear 40. The idle gear 40 always meshes with the reverser gear 1 on the front side of the reverser shaft 3. The rear reverser gear 2 is always meshed with the idle gear 5 via the reverse gear 41, and the reverser clutch 4 on the reverser shaft 3 is engaged.
Has a synchro mechanism, front and rear reverser gears 1,
The clutch teeth 42 and 43 that are integral with the gear 2 are engaged with each other so that the neutral position N can be switched to the forward drive position F and the reverse drive position R by a shifter operation.

The reverser shaft 3 and the speed change gear shaft 33 are always in an interlocking state, and the gears 4 on the speed change gear shaft 33 are in contact with each other.
4 to 47, the transmission gears 48 to 51 on the transmission shaft 36
The gear shift clutch 52 between the gear shift gears 48 and 49 and the synchro gear shift clutch 53 between the gear shift gears 50 and 51 are shifted forward and backward to shift the gears 48 to 51.
By engaging the clutch teeth of the above, the first to fourth main shifts are obtained.

Transmission transmitted by the main transmission 23 is transmitted from the speed change shaft 36 to the auxiliary transmission on the rear side, is sub-shifted by the auxiliary transmission, and is transmitted to the differential. At the same time, it is transmitted from the front wheel transmission take-out device to the front wheel drive shaft 39. The speed increase switching device 24 (not shown) provided between the front wheel drive shaft 39 and the front wheel take-out shaft 38 directly connects the front wheel drive shaft 39 and the front wheel take-out shaft 38 to connect the front wheel 15 to the rear wheel 18. 4WD rotating at the same speed
Drive and the front wheel extraction shaft 3 from the gear 54 on the front wheel drive shaft 39 side
The gear 55 on the 8th side can be switched to a speed-up drive in which the speed-up ratio is approximately doubled, so that speeding up of the front wheels 15 facilitates turning travel.

Regarding the transmission of the power take-off system, the PTO
P from the drive gear 32 through the gear 56 on the gear shaft 34
The PTO clutch 7 meshes with a PTO clutch gear 57 that is rotatable on the TO clutch shaft 37, and the PTO clutch 7 is a friction multi-plate type.
It is provided between the PTO clutch gear 57 and a clutch case 58 that rotates integrally with the PTO clutch shaft 37, and is turned on and off by hydraulic operation.

On the rear side of the PTO clutch 7, there is provided a switching gear 60 for switching the power take-off shaft 6 between forward and reverse rotation. This switching gear 60, as an internal gear, is always spline-fitted with the power take-off shaft 6 to rotate integrally therewith, and at the position moved to the rear side, it is also fitted to the spline at the rear end of the PTO clutch shaft 37. Then, the PTO clutch shaft 37 and the power take-off shaft 6 are integrally transmitted in the normal rotation A. Also, PTO
A rotatable PTO reverse rotation gear 8 is provided on the clutch shaft 37, and the gear 8 is provided between the idle gear 5 and the idle gear 5.
When the PTO clutch gear 57 is transmitted in the normal direction and the PTO clutch gear 57 is rotated in the normal direction, the gear 8 is set in a reverse rotation relationship. Further, the PTO reverse rotation gear 8 has a gear 59 which meshes with the switching gear 60 on the rear side, and when the switching gear 60 is moved to the front side with respect to the gear 8, the PTO reverse rotation gear 8 meshes to enter the reverse rotation B transmission state. The fitting of the PTO clutch shaft 37 with the spline portion is released. As a result, the power take-off shaft 6 in the forward rotation A position is PTO drive gear 32 → gear 56 → PTO clutch gear 57 → PTO clutch 7 → clutch case 58 → PT.
The O-clutch shaft 37 → the switching gear 60 → the power take-off shaft 6 serves as a transmission system path, but at the reverse rotation B position, the traveling drive gear 31 → the idle gear 40 → the idle gear shaft 35 → the idle gear 5
→ gear 61 → PTO reverse rotation gear 8 → switching gear 60 → power take-off shaft 6 becomes a transmission path.

The transmission of the power take-off shaft 6 during the reverse B operation cannot be disengaged by the PTO clutch 7. In FIG. 4, the point different from the above example is that the PTO reverse rotation gear 8 is directly meshed with the idle gear 5 and the reverse rotation B transmission state can be established by meshing with the PTO reverse rotation gear 8. Compared to the above example, the gear 61 and the gear 59 are unnecessary.

In FIG. 5, the difference from the above example is that the PTO
A switching clutch 62, which replaces the switching gear 60, is provided between the clutch 7 and the PTO reverse rotation gear 8 on the power take-off shaft 6. The switching clutch 62 is operated toward the PTO clutch side to change the clutch teeth. When it engages with 63, forward rotation A transmission can be performed, and by operating to the PTO reverse rotation gear 8 side, the clutch teeth 6
When it is occluded to 4, reverse B transmission can be performed. Reference numeral 65 is a gear meshed between the idle gear 54 and the PTO reverse rotation gear 8.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a side view of a part of a transmission device of a tractor.

FIG. 2 is a side view of a part thereof.

FIG. 3 is a side view of the tractor.

FIG. 4 is a side view of another embodiment.

FIG. 5 is a side view of another embodiment.

[Explanation of symbols]

 1 reverser gear 2 reverser gear 3 reverser shaft 4 reverser clutch 5 idle gear 6 power take-off shaft 7 PTO clutch 8 PTO reverse gear

Claims (1)

[Claims] Claims: 1. A reverser clutch 4 that moves and meshes in the direction of a reverser shaft 3 in which the reverser gears 1 and 2 are arranged, and switches between forward and reverse travel transmission, and an idle gear 5 that meshes with the reverser gears 1 and 2. A tractor provided with a PTO clutch 7 for turning on and off transmission to and from the take-out shaft 6, and a PTO reverse rotation gear 8 on the power take-out shaft 6 side of the PTO clutch 7 and capable of switching to reverse rotation transmission from the idle gear 5 side. PTO transmission.