JPH05169995A - Tractor transmission device - Google Patents

Abstract

PURPOSE:To produce a low cost tractor having a PTO shaft transmission system exclusive for its special purpose by interchangeably attaching different clutch housings whose transmission configurations and the speed change configurations for the PTO shaft of a tractor are different from each other, to the front surface of a uniform and common transmission easing. CONSTITUTION:A transmission casing 26 us provided therein with a main speed change shaft 7, a main counter shaft 12, a running power transmission system for transmitting running power from a counter speed change shaft by way of an output shaft, and a PTO transmission system to which a PTO speed change shaft 25 is journalled. A clutch housing 38 is provided therein with a main clutch shaft 32, a reverser shaft 32, reverser counter shafts 36, 37 and the like. The clutch housing 38 is interchangeably connected to the front end surface of the transmission casing 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for a tractor, in which a mission case is commonly used to reduce costs.

[0002]

2. Description of the Related Art A tractor is equipped with a working machine and is transmitted from a power take-off shaft (PTO shaft). Therefore, depending on the type and form of the working machine,
The transmission form of the PTO shaft and the number of gears are also different. Producing many different types of power transmission depending on the application of the tractor tends to be costly.

The present invention intends to easily and inexpensively produce transmissions having different transmission modes of the PTO shaft by producing a transmission in which the transmission case is shared and only the clutch housing is changed in various ways. Is. PT
As a transmission form of the O-axis, generally, for example, a PTO clutch is shared with the main clutch of the traveling transmission system and is independent, and those that can and cannot be reversely transmitted, and further this reverse transmission is There are things that can shift gears, such as multiple gears.

[0004]

The present invention is directed to a main transmission shaft 7 having main transmission gears 1 to 4 and main transmission clutches 5 and 6,
Main counter gears 8 to 8 meshing with these main transmission gears 1 to 4
A main counter shaft 12 having an eleventh and an auxiliary transmission gear 13
To 16 and the auxiliary transmission clutches 17 and 18, the auxiliary transmission shaft 1
9 and a traveling transmission system that travels through the output shaft 20 and P
A reverser having a main clutch shaft 28 having a main clutch 27, reverser gears 29, 30 and a reverser clutch 31 on the front end face of a transmission case 26 having a PTO transmission system in which the TO transmission gears 21 to 24 are mounted on a PTO transmission shaft 25. The shaft 32 and its reverser counter gears 33, 3
A clutch housing 38, in which the reverser counter shafts 36 and 37 of 4, 35 and the like are housed, is a structure of a transmission device of a tractor which is connected interchangeably.

[0005]

In the traveling transmission, the main clutch shaft 28 is rotated by the drive of the engine through the main clutch 27 and is transmitted to the reverser 38, and the reverser gear 29 on the reverser shaft 32 of the reverser clutch 31 is transmitted. And 3
By switching the occlusion to 0, the reverser counter gears 33, 34 and 35 of the reverser counter shafts 36 and 37 can be changed.
And the like, and the main shift clutches 5 and 6 and the sub shift clutch 1 in the transmission case 26 from the reverser shaft 32.
Transmission of the traveling transmission system is performed via 7, 18, etc. The main shift is
The main transmission gears 1 to 4 and the main counter gears 8 to 1 are operated by switching the main transmission clutches 5 and 6 on the main transmission shaft 7.
The speed is changed by interlocking with 1 and 1. In addition, the sub-transmission is shifted by interlocking with the sub-transmission gears 13 to 16 by switching the sub-transmission shafts 19 and 18 on the output shaft 20.

The speed change transmission of the PTO shaft 25 is performed by changing the speed of the PTO speed change gears 21 to 24 in the mission case 26 toward the PTO speed change shaft 25. In the production process, for example, the main clutch 27 and the PTO clutch may be the same clutch, or may be separately provided, and further, a PTO reverse rotation gear for performing reverse rotation transmission of the PTO transmission shaft 25 may be provided. In the case of providing it,
The clutch housing 38 having these specification configurations is
It is attached to the front end surface of the mission case 26, and the main transmission shaft 7, the sub transmission shaft 19, the output shaft 20, the PTO transmission shaft 25 in the transmission case 26, and the mechanisms such as these transmission clutches and transmission gears are shared. Even if the internal structure of the clutch housing 38 changes depending on each specification, the clutch housing 38 can be simply connected to the front end surface of the mission case 26, and thus the structure is simple and the production cost can be reduced.

[0007]

EXAMPLE A tractor is a four-wheel drive system in which front wheels and rear wheels are driven to travel, and the front wheels are steered. A clutch housing 38 is connected to the front engine body, a front mission case 26 is connected to the rear side of the clutch housing 38, and a rear mission case 39 is further connected. Axle housings 41 are provided on both left and right sides of the rear mission case 39 for mounting a rear axle 40 for mounting rear wheels. This axle housing 4
1 is configured to project rearward from the rear end portion 42 of the rear mission case 39, connect a lower link 44 for connecting a working device to the projecting portion 43, and also to the mission case 39.
A PTO shaft 45 for interlocking the working device is projected from the rear end portion 42. A hydraulic case 46 is provided on the upper side of the rear mission case 39, and has an arm shaft 48 for vertically rotating the lift arm 47, a lift cylinder 49 for hydraulically rotating the arm shaft 48, and the like.

1 to 4, the clutch housing 38 has a mounting end surface 50 for mounting the front portion on the engine body.
The rear end surface 51 overlaps with the front end surface 52 of the mission case 26 so that it can be attached. This rear end face 5
The rear wall 53 is formed near 1, and the clutch housing 38
An intermediate wall 54 is formed at the front and rear intermediate portions. A flywheel 56 connected to a crankshaft 55 of the engine and a main clutch shaft 28 rotatable with respect to the crankshaft 55 are provided in the clutch chamber in the front part of the intermediate wall 54. A portion is supported by the intermediate wall 54 via a bearing seat 57, and a main clutch 27 which can be disengaged by a shifter 58 is provided between the flywheel 56 and the main clutch shaft 28 so that the clutch is normally engaged. One main clutch 27 can be disengaged by clutch petal operation.

The reverser shaft 32, the reverser counter shafts 36, 37, the PTO input shaft 59, the front wheel output shaft 60, etc. are axially mounted in the reverser chamber between the intermediate wall 54 and the rear wall 53 of the clutch housing 38. Of these, the front end of the reverser counter shaft 36 is mounted on the intermediate wall 54 via a bearing seat 61. The reverser counter gear 33 of the reverser counter shaft 36 includes an input gear 62 at the rear end of the main clutch shaft 28, a reverser transmission gear 29 on the reverser shaft 32,
And always meshes with the gear 63 on the PTO input shaft 59. Further, the reverser gear 30 is reversely rotated from the reverser counter gear 34 via the gear 35. When the reverser clutch 31 is switched in the axial direction and engaged from the neutral position N to the front side reverser gear 29 side, forward transmission F is obtained, and when engaged to the rear side reverser gear 30 side, the working depth R is reached.
Is obtained. The reverser clutch 31 may be of a wet multi-plate configuration to supply lubricating oil to the reverser chamber.

The PTO input shaft 59 is provided with a forward / reverse switching gear 64 for switching from the neutral position N to the forward rotation A direction and the reverse rotation B direction by a shifter operation.
By projecting the front end of the counter shaft 65 into the reversing chamber,
A gear 66, which is always meshed with a back gear 68 on a back gear shaft 67, which is separately mounted, is provided so as to rotate integrally, and the forward / reverse switching gear 64 on the PTO input shaft 59 is moved in the axial direction by a shifter operation. The PTO counter shaft 65 is transmitted in the normal rotation A by engaging with the back gear 6
By engaging with 8, the reverse B transmission is performed.

An intermediate wall 69 is formed in the front and rear intermediate portion of the front mission case 26, and the clutch housing 38 is formed.
The main transmission shaft 7 is provided coaxially with the reverser shaft 32 and the main counter shaft 12 coaxially with the reverser counter shaft 36 so as to extend between the PTO input shaft 5 and the rear wall 53.
A PTO transmission shaft 25 is provided coaxially with the shaft 9. In the main shift, the main shift gear 1 on the main shift shaft 7 rotated from the reverser shaft 32 meshes with the main counter gear 8 on the main counter shaft 12, and the main shift gears 2, 3, 4 are engaged.
Also constantly meshes with the opposing main counter gears 9, 10, 11,
The first speed is obtained when the main transmission clutch 6 on the main transmission shaft 7 is switched from the neutral position to the main transmission gear 4 side by the shifter operation and engaged, and the second speed is obtained when switched to the main transmission gear 3 side. Be done. When the main transmission clutch 5 is switched to the main transmission gear 2 side, the third speed is obtained, and when it is switched to the main transmission gear 1 side, it is transmitted to the main transmission shaft 7 in a direct connection state to obtain the fourth speed.

The PTO shaft 25 can be shifted by moving the PTO gears 21, 22 and 23, 24 in the axial direction by operating a shifter to move the PTO gear 21 to the PTO gear.
The second speed can be obtained by meshing with the PTO counter gear 70 on the counter shaft 65.
To 72 and 24 to 73,
Get the 3rd speed, 1st speed, 4th speed. Such a PTO shaft 2
The first to fourth speed shifts of No. 5 can be switched in either direction at the same number of speed stages by switching between forward rotation A and reverse rotation B of the forward / reverse switching 64.

With respect to the sub-transmission, the sub-transmission shaft 19 and the output shaft 20 are provided between the front wall 74 of the rear transmission case 39 and the intermediate wall 69, and the sub-transmission shaft 19 and the output shaft 20 are provided at the rear end of the main transmission shaft 7. A gear 75 is provided in the auxiliary transmission chamber, and this gear 75
The auxiliary transmission gear 13 which is always meshed with
A gear 77, which is provided on the output shaft 20 and is rotatable with respect to the output shaft 20, is meshed with the gear shaft 76. The rotatable sub-transmission gear 14 on the sub-transmission shaft 19 meshes with the sub-transmission gear 15 at the rear of the gear shaft 76, and the sub-transmission gear 14
A gear 79 connected to the gear shaft 78 is meshed with the auxiliary transmission gear 16 on the output shaft 20. On the sub-transmission shaft 19, the sub-transmission clutch 17 is engaged from the neutral position to the sub-transmission gear 13 side by the shifter operation to set the sub-transmission fourth speed,
The second gear is engaged with the sub transmission gear 14 side, the sub transmission clutch 18 is engaged with the sub transmission gear 15 side to be the third speed, and the sub transmission gear 18 is engaged with the sub transmission gear 16 side to be the first speed. In the case of the second speed and the fourth speed, the rotation of the auxiliary transmission shaft 19 is transmitted from the gear 80 at the rear end to the gear 81 on the output shaft 20.

The power of the traveling transmission system, which is sub-shifted in this way, meshes with the output shaft 20, the pinion gear 82 in the rear transmission case 39 and the ring gear 83 of the differential gear, and the differential shaft 84 with the left and right axles. The vehicle travels by being transmitted to the gear 85 in the housing 41, the rear axle 40, and the like. The P
The TO transmission shaft 25 extends near the wall portion of the rear end portion 42 across the rear mission case 39, and gears 86 and 87 interlock with the PTO shaft 45 supported by the wall portion. Further, the front wheel output shaft 60 extends to the front wall 74 of the rear transmission case 39, and a clutch gear 88 which is switchably movable in the front-rear direction at the rear end of the front transmission shaft 39 is provided from the gear 81 on the output shaft 20 to the PTO gear shift. It is configured to transmit the steerable front wheels by interlocking via a rotatable gear 89 on the shaft 25.

In FIG. 5, the clutch housing 38 of the above example is replaced with a PTO clutch 90 independent of the main clutch 27, and the front mission case 26 to the rear mission case 39 have the same form. ..
For this reason, the main clutch 27 works exclusively for the traveling transmission system, and a flywheel 56 or a cylinder shaft 91 that is always rotatably linked is provided on the outer periphery of the main clutch shaft 28.
It is configured to rotate regardless of whether or not it is cut. This cylinder shaft 91
The rear end has a gear 92.

The reverser shaft 32, the PTO input shaft 59, the front wheel output shaft 60, and the like of the reverser chamber, together with the clutch housing 38 itself, are formed so as to extend forward longer than in the previous example, and are arranged in front of the reverser counter shaft 36. Is provided with a shaft 94 of an idle gear 93, and meshes with a gear 96 integral with a PTO clutch shaft 95 rotatable around the PTO input shaft 59 via the gear 92 of the cylinder shaft 91, through the idle gear 93.

The PTO clutch 90 has a hydraulic cylinder 97 in the form of a wet multi-plate, and is configured to open and close the clutch by hydraulic operation. The PTO clutch shaft 95
Between the PTO input shaft 59 and the PTO clutch 90
Is turned on and off. The reverser clutch 31 on the reverser shaft 32 is configured so that it can be turned on and off in a synchronized form.

6 and 7, the difference from the above example is that
The form of the PTO transmission system on the mission case 26 side is changed. Therefore, this case of mission case 2
On the basis of No. 6, the clutch housing 38 as shown in FIG. 1 or FIG. The transmission mode of the PTO transmission system in the front transmission case 26 is set between the main counter gears 8 to 11 on the main counter shaft 12 of the main transmission unit and the PTO transmission gears 21 to 24 on the PTO transmission shaft 25. The PTO counter shaft 65 of the previous example shown in FIG. 2 is removed. Therefore,
The input of the PTO speed change shaft 25 is 8 to 8 of the main counter shaft 12.
The transmission is transmitted from 11.

The PTO input shaft 59 for transmitting the PTO transmission shaft 25, the back gear shaft 67, etc. are not provided in the reverser chamber of the clutch housing 38. 8 shows a configuration in which the clutch housing 38 is provided with the back gear shaft 67 of the PTO transmission system, the back gear 68, and the like, as shown in FIGS.
8 shows an example of attachment. The clutch housing 38 has a PT
A gear 98 is provided on the O input shaft 59, and a forward / reverse switching gear 64 is axially switched by a shifter 99 on a PTO counter shaft 65 extending from the front transmission case 26 side to the inside of the clutch housing 38. . By this shifter operation, the forward / reverse switching gear 64 can be engaged with the gear 98, and the PTO counter shaft 65 can be set to the forward rotation transmission A.

The back gear 68 is mounted on the case lid 100 by a back gear shaft 67 so that a part of the back gear 68 meshes with the gear 98 and a part of the back gear 68 can be meshed with the forward / reverse switching gear 64 removed from the gear 98. At this time, the transmission from the PTO input shaft 59 is transmitted from the gear 98 through the back gear 68 and the forward / reverse switching gear 64 to the PTO counter gear 65 in the reverse rotation transmission B.
It becomes the state of. Reference numeral 101 denotes an opening to which the case lid 100 is attached, through which the back gear 68, the back gear shaft 67, and the like can freely enter and leave. 102 is a bolt for attaching and detaching the case lid 100. The shifter 99 is attached to the case lid 100.
Shifter shaft 103 is rotatably supported, and operation mechanism 1
It is linked with 04. Reference numeral 105 denotes a mounting bolt that mounts between the transmission case 26 and the clutch housing 38. Further, when switching between forward and reverse rotation is not necessary, the forward and reverse switching gear 64 is forwardly rotated by the fixed arm by replacing the fixed arm with the shifter 99 without the back gear 68. It is also possible to fix the PTO counter shaft 25 at the position A and prevent reverse rotation transmission.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a developed side sectional view of a clutch housing portion of a tractor.

FIG. 2 is a developed side sectional view of a front mission case portion of the same.

FIG. 3 is a sectional view of the rear mission case portion on the developed side.

FIG. 4 is a front view showing the axial arrangement of the clutch housing portion.

FIG. 5 is a developed side sectional view of a clutch housing portion having different specifications.

FIG. 6 is a developed side sectional view of a clutch housing portion and a front transmission case portion having different specifications.

FIG. 7 is a front view showing the axial arrangement of the clutch housing part.

FIG. 8 is a developed plan view showing an example of another part of the clutch housing portion.

FIG. 9 is a front view thereof.

FIG. 10 is an overall schematic plan view of a tractor vehicle body.

[Explanation of symbols]

 1-4 Main transmission gears 5,6 Main transmission clutch 7 Main transmission shaft 8-11 Main counter gear 12 Counter shaft 13-16 Sub transmission gear 17,18 Sub transmission clutch 19 Sub transmission shaft 20 Output shaft 21-24 PTO transmission gear 25 PTO speed change shaft 26 mission case 27 main clutch 28 main clutch shaft 29,30 reverser gear 31 reverser clutch 32 reverser shaft 33,34,35 reverser counter gear 36,37 reverser counter shaft 38 clutch housing

Claims (1)

[Claims] 1. A main transmission shaft 7 having main transmission gears 1 to 4 and main transmission clutches 5 and 6, and these main transmission gears 1 to 4.
A main counter shaft 12 having main counter gears 8 to 11 meshing with the sub counter gears 13 to 16 and a sub speed change clutch 1.
A transmission case including a traveling transmission system having transmission shafts 7 and 18 for transmitting traveling from an auxiliary transmission shaft 19 through an output shaft 20, and a PTO transmission system in which PTO transmission gears 21 to 24 are mounted on a PTO transmission shaft 25. A main clutch shaft 28 having a main clutch 27, a reverser gear 32, 30 and a reverser shaft 32 having a reverser clutch 31, and reverser counter shafts 36, 37 of the reverser counter gears 33, 34, 35 are mounted on the front end face. Clutch housing 38
Is a tractor transmission that is connected interchangeably.