JPH0656194B2 - Agricultural tractor transmission - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a transmission that has a synchromesh transmission, among transmissions for agricultural tractors.

(B) Prior Art Conventionally, a transmission including a synchromesh transmission has been known. For example, JP-A-49-
This is like the technique described in Japanese Patent No. 105065.

Further, as in Japanese Patent Publication No. 55-20095, there is a technique in which the main transmission is constituted by a hydraulic clutch type transmission and both forward and reverse shifting are performed by selecting a hydraulic clutch device.

(C) Problems to be Solved by the Invention An object of the present invention is that the synchromesh transmission cannot be compactly and compactly arranged in the mission case because the synchromesh device itself is large. is there. On the other hand, in the present invention, a wide gear that transmits power from the main clutch shaft to the shaft of the synchromesh type main transmission is arranged at the rear portion of the synchromesh type main transmission, thereby providing a synchromesh type transmission. The transmission is prevented from becoming large.

Further, in the synchromesh transmission, the uncertainty of the gear shifting operation caused by the shortage of the lubricating oil is eliminated by scraping up the lubricating oil splash by the constantly rotating gear group arranged at the rear.

(D) Means for Solving the Problems The object of the present invention is as described above, and a configuration for achieving the object will be described below.

A main clutch shaft that transmits the rotation of the main clutch device to a synchromesh transmission is provided, an output shaft and a synchromesh shaft are provided in parallel with the main clutch shaft, and a synchromesh shaft is provided between the synchromesh shaft and the output shaft. A mesh type transmission device is arranged, a gear meshing with a gear on the main clutch shaft is arranged behind the synchromesh type transmission device on the synchromesh shaft, and after shifting by the front synchromesh type transmission device. Is transmitted to the output shaft to transmit power to the rear.

(E) Embodiment and Action The object and the structure of the present invention are as described above. Next, the structure of the embodiment will be described with reference to the accompanying drawings.

FIG. 1 is an overall side sectional view of a transmission of an agricultural tractor according to the present invention, and FIG. 2 is an enlarged sectional view of a synchromesh type main transmission.

The transmission of the agricultural tractor includes a clutch housing C,
Three cases, a transmission case M and a rear axle housing R, are connected and arranged inside thereof.

In the clutch housing C, the PTO main clutch device 2
2 and the traveling main clutch device 23 are configured as a dual clutch device. Therefore, when the clutch pedal is depressed one step, the traveling clutch device is disengaged, and when the clutch pedal is further depressed one step, the PTO clutch device is disengaged.

The rotation of the PTO clutch device after connection and disconnection is transmitted to the inside of the mission case M via the PTO main clutch shaft 2.
The rear end of the PTO main clutch shaft 2 is transmitted to the shaft 15 via a coupling, and is transmitted from the gear 30 on the shaft 15 to the output shaft 1
It is transmitted to the loosely fitted gear 32 on the hydraulic clutch shaft 18 via the gear 31 loosely fitted in 2.

The hydraulic clutch device 33 is a PTO clutch device,
It is used when the rotation of the PTO shaft 21 is frequently connected and disconnected. The rotation of the hydraulic clutch device 33 causes the gear 37 to rotate.
-Transmitted to the gear 39, gear 41, and gear 43.

The gear 37, the gear 39, the gear 41, and the gear 43 are always meshed with the gear 38, the gear 40, the gear 42, and the gear 44 on the shaft 19, respectively, and the PTO gear shift is four by the lateral movement of the shift shifters 70 and 71. It is performed in steps. The rotation after the PTO gear shift is from the shaft 19 through the coupling to the PTO.
It is transmitted to the shaft 21.

The above is a description of the configuration of the PTO transmission.
Next, the main transmission device for traveling speed change will be described.

The rotation after being engaged and disengaged by the traveling main clutch device 23,
It is transmitted to the gear 3 via the main clutch shaft 1. The gear 3 transmits power to the gear 4 loosely fitted to the output shaft 12,
Has a wide width and simultaneously meshes with the gear 5 on the shaft 13 and the gear 6 on the shaft 14. In addition, a gear 26 and a gear 29 are fixedly mounted on the shaft 13, and the gear 26 and the gear 29 mesh with the fixed gears 27 and 28 on the upper output shaft 12. One of these two sets of gear trains is selected by the synchromesh transmission 35. As a result, the first forward speed and the third forward speed can be obtained.

Further, the shaft 14 is driven by the gear 6, and the fixed gears 7 and 10 on the shaft 14 are rotated. The gear 7 is meshed with the fixed gear 9 on the output shaft 12 through the reverse rotation loosely fitting gear 8 on the shaft 13, and the gear 10 is meshed with the fixed gear 11 on the output shaft 12. By selectively engaging one of the two sets of gears by the synchromesh transmission 34, the second forward speed and the reverse speed can be obtained.

The above is the synchromesh type main transmission, and the rotation after shifting in the main transmission is transmitted from the output shaft 12 to the creep transmission.

That is, the gear 47 at the rear end of the output shaft 12 is the counter shaft 16
, Which is meshed with the fixed gear 46 of
The power transmission is possible by bypassing the gear 45 to the gear 49 on the shaft 17. The shift shifter 48 selects either the detour gear train or the direct connection between the output shaft 12 and the shaft 17. As a result, creep speed change is performed. Further, a gear-sliding auxiliary shift is performed between the shaft 17 and the pinion shaft 20.

That is, the fixed gears 51, 52, 53 on the shaft 17 and the gears 54, 55, 57 on the pinion shaft 20 mesh with each other, and one of the three gear trains is moved forward and backward by the shift shifter 56. Select with and shift to 3 speeds.

Further, the power for driving the front wheels is taken out from the gear 61 at the front end of the pinion shaft 20.

That is, through the loose fitting gears 62 and 63 on the PTO shaft 21,
The power is transmitted to the gear 64 on the shaft 25, and the clutch shifter 65 slides to connect and disconnect the front wheel driving force. From the pinion 58 of the pinion shaft 20, the differential ring gear 59
Transmission power is transmitted to.

Reference numeral 60 is a drum for a parking brake, 50 is a traveling inertia slip prevention brake device, and 36 is a drum of a PTO inertia slip prevention brake device.

The configuration of the present invention is as described above, and the position of the gear 3 on the main clutch shaft 1 and the synchromesh transmissions 34, 3 are described.
The main feature is that 5 is placed side by side with the main transmission unit.

In particular, once the main clutch shaft 1 has transmitted to the intermediate position of the transmission case M, the gear train and the synchromesh type transmission again transmit the power to the front like turning up and then the power to the rear again. The point is that the power is transmitted by drawing the letter "no" of transmission.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, transmission of power from the main clutch shaft 1 to the synchromesh type main transmission is first performed by the main clutch shaft 1.
The power is transmitted to the rear of the synchromesh transmission, and the power is transmitted from the gear 3 arranged behind the main clutch shaft 1 to the synchromesh shaft 13 or the synchromesh shaft 14, and the synchromesh transmission provided in front of the gear 3. Since the power is transmitted rearward from the output shaft 12 after the gear is shifted by the device, the gear 3 on the main clutch shaft 1 which is constantly rotating in the connected state of the main clutch is engaged regardless of the gear shifting operation of the synchromesh transmission. And the gear 4 that meshes with it.
Since 5 and 6 can be rotated in the oil sump portion near the center of the transmission case, the synchromesh transmission in the front can be sufficiently sprayed with lubricating oil splash due to the rotation of the gears. It is possible to perform a reliable gear shift operation by the automatic transmission.

Secondly, by disposing a wide gear that transmits power from the main clutch shaft to the shaft of the synchromesh type main transmission device at the rear portion of the synchromesh type main transmission device, the synchromesh type transmission device It has prevented it from growing.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a transmission of an agricultural tractor according to the present invention, and FIG. 2 is an enlarged sectional view of a synchromesh type main transmission. 1 ... Main clutch shaft 2 ... PTO main clutch shaft 4 ... Wide gear 34,35 ... Synchromesh transmission

Claims (1)

[Claims] 1. A main clutch shaft for transmitting power of rotation of a main clutch device to a synchromesh transmission, and an output shaft and a synchromesh shaft provided in parallel with the main clutch shaft, and a synchromesh shaft and an output shaft. And a gear meshing with a gear on the main clutch shaft is arranged behind the synchromesh transmission on the synchromesh shaft, and a synchromesh transmission on the front side is arranged. A transmission device for an agricultural tractor, characterized in that the transmission device transmits rotation after shifting to an output shaft to transmit power to the rear.