JPS61236949A - Transmission of agricultural tractor - Google Patents

Abstract

PURPOSE:To facilitate speed change operation by providing both forward and backward stages of a synchro-mesh system transmission. CONSTITUTION:The rotation connected and disconnected by a main traveling clutch 23 is transmitted to a gear 3 through a main traveling clutch shaft 1 and then to a gear 4 fitted loosely onto a shaft 12. The gear 4 meshes simultaneously with gears 5, 6. Gears 26, 29 fixed to a shaft 13 mesh with gears 27, 28 fixed to the shaft 12. A synchro-mesh system transmission 35 is provided on these two sets of gear trains to provide selectively one forward speed and 3 forward speed. Also, a gear 7 fixed to a shaft 14 meshes with a gear 9 fixed to the shaft 12 through a reversal gear 8 loosely fitted onto a shaft 13 and a gear 10 fixed to a shaft 14 meshes with a gear 11 fixed to the shaft 12. And a synchro-mesh system transmission 34 is provided on these two sets of gear trains so that the forward two speed and backward speed can be selected.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a transmission system for an agricultural tractor, and relates to the structure and arrangement of a main transmission system that changes forward and reverse speeds. □ (B) Prior Art Conventionally, as disclosed in Japanese Patent Publication No. 55-20095, there is a technology in which the main transmission is configured with a hydraulic clutch type transmission, and both forward and reverse speed changes are performed by selecting the hydraulic clutch device. There was.

However, there is no such system in which the main transmission is a synchromesh type transmission, and the synchromesh type transmission is capable of performing reverse shifting.

(C) Problems to be Solved by the Invention An object of the present invention is to construct a transmission for an agricultural tractor at a lower cost than a hydraulic clutch type transmission, and to provide a transmission similar to a hydraulic clutch type transmission. It is designed to allow easy gear shifting operations.

In addition, synchromesh type transmissions cannot be placed in a small and compact manner in the transmission case because the synchromesh device itself is large, but in the present invention, from the main clutch shaft, The wide gear that transmits the power on the shaft of the synchronized main transmission is
By arranging it at the rear of the synchromesh type main transmission, the synchromesh type transmission is prevented from becoming bulky.

(d) Means for Solving the Problems The objects of the present invention are as described above.Next, the configuration for achieving the objects will be explained.

In the traveling transmission of an agricultural tractor, a synchromesh type transmission is configured to change the forward speed into multiple gears, and a synchromesh type transmission is used to change the reverse gear as well. The two are placed side by side.

Further, the gear on the main clutch shaft that transmits power from the main clutch device to the synchromesh type transmission is arranged at the rear of the position where the synchromesh device is juxtaposed.

(E) Embodiments and Functions The purpose and structure of the present invention are as described above. Next, the structure of the embodiments will be explained based on the attached drawings.

FIG. 1 is an overall side sectional view of a transmission for 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 an agricultural tractor consists of a clutch housing C,
The three cases of Missing Case M1 and Rear Axle Housing R are connected and arranged inside.

Inside the clutch housing C, there is a 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 latch device for running the vehicle is disengaged, and when the clutch pedal is depressed one more step, the PTO clutch device is disengaged.

The rotation of the PTO clutch device after it is engaged or disconnected is transmitted to the inside of the mission case M through the PTO main clutch shaft 2.

The PTO main clutch shaft 2 end is transmitted to the shaft 15 via a coupling, from a gear 30 on the shaft 15 to a loosely fitted gear 32 on the hydraulic clutch shaft 18 via a gear 31 loosely fitted on the shaft 12. transmitted to. The hydraulic clutch device 33 is P
This is a TO clutch device and is used when the rotation of the PTO shaft 21 is frequently connected and disconnected. The rotation of the hydraulic clutch device 8 is caused by gears 37, 39, 41, and 43.
can be conveyed to.

Gear 37, gear 39, gear 41, and gear 43 are constantly meshed with gear 38, gear 40, gear 42, and gear 44 on shaft 19, respectively, and the PTO shift is performed by the left and right movement of gear shifters 70 and 71. It is done in stages. P.T.
The rotation after the O shift is from the shaft 19 to the P via the coupling.
The information transmitted to the TO shaft 21 has been described above regarding the configuration of the PTO transmission.

Next, the main transmission for traveling will be explained.

The rotation after being connected and disconnected by the traveling main clutch device 23 is
It is transmitted to the gear 3 via the traveling main clutch shaft 1. The gear 3 transmits power to a gear 4 that is loosely fitted on the shaft 12, and the gear 4 is configured to be wide and meshes with a gear 5 on the shaft 13 and a gear 6 on the shaft 14 at the same time.

In addition, gears 26 and 29 are fixedly mounted on the shaft 13, and these gears 26 and 29 mesh with the fixed gears 27 and 28 on the upper shaft 12. One of these two sets of gear trains is selected by the synchromesh type transmission 35. This provides one forward speed and three forward speeds.

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 a fixed gear 9 on the shaft 12 via a reversing loose gear 8 on the shaft 13, and the gear 10 is meshed with a fixed gear 11 on the shaft 12. By selectively engaging one of these two sets of gear trains with the synchromesh type transmission 34, two forward speeds and a reverse speed can be obtained.

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

That is, the gear 47 at the rear end of the shaft 12 meshes with the fixed gear 46 of the counter shaft 16, and power can be transmitted in a detour from the gear 45 to the gear 49 on the shaft 17 via the shaft 16. has been done. The speed change shifter 48 selects either this detour gear connection or the direct connection of the shafts 12 and 17. This results in creep shifting. Further, a gear sliding type auxiliary speed change 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 are in mesh with each other, and one set of the three sets of gears is controlled by the forward and backward movement of the speed change shifter 56. to select and shift to three gears.

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

That is, via the upper fitting gears 62 and 63 on the two PTO shafts,
Power is transmitted to a gear 64 on the shaft 25, and sliding of the clutch shifter 65 connects and disconnects the front wheel drive force. From the pinion 58 of the pinion shaft 20, the differential ring gear 59
Transmission power is being transmitted.

60 is a drum for the parking brake, 50 is a driving inertia slip prevention brake device, and 36 is a drum for the PTO and inertia slip prevention brake device.

The configuration of the present invention is as described above, and the position of the gear 3 on the traveling main clutch shaft 1 and the synchromesh type transmission 3
A major feature is that the 4.35 is located side by side with the main transmission section.

In particular, once the power is transmitted to the intermediate position of the transmission case M by the main clutch shaft 1, the power is transmitted forward again through the gear train and synchromesh type transmission, and then to the rear again. ``no'' means to transmit power
It is distinctive in that it was drawn with a `` '' character to transmit power.

(f) 1. Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

Firstly, the sink name and the
By using a summer-type transmission, it is possible to switch between forward and reverse without engaging or disconnecting the hydraulic clutch device when work is performed by repeatedly going forward and backward. be.

Second, compared to a conventional transmission using a hydraulic clutch device, it can be constructed at a lower cost and is easier to assemble.

Thirdly, the power was transmitted from the main clutch shaft l to the synchromesh type main transmission at the rear of the synchromesh type transmission, and then the gears were shifted in a ``no'' pattern. This enabled the transmission of agricultural tractors to be constructed compactly.

[Brief explanation of the drawing]

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

Claims (2)

[Claims] (1) In the traveling transmission of an agricultural tractor, a synchromesh type transmission is configured to change the forward speed into multiple stages, and a synchromesh type transmission is also used to change the reverse speed. A transmission device for an agricultural tractor characterized by having both of the two installed together. (2) In the transmission according to claim 1,
A transmission device for an agricultural tractor, characterized in that a gear on a main clutch shaft that transmits power from a main clutch device to a synchromesh type transmission device is arranged at the rear of a position where the synchromesh device is juxtaposed.