JPH0828650A - Speed reduction gear of tractor - Google Patents

Abstract

PURPOSE:To simplify the constitution of a speed reduction gear, eliminate the following rotation of a PTO transmission shaft during drive power transmission, and reduce the distortion and vibration of the PTO transmission shaft by rotatably providing a speed change clutch, speed change gears and a gear shaft cylinder for traveling power transmission on the PTO transmission shaft. CONSTITUTION:Speed change gears 8 to 10 and a gear shaft cylinder 13, on the external periphery of which a plurality of gears 11 and 12 are formed, are arranged on the PTO transmission shaft 1 between front and rear ball bearings 4 and 5. The needle bearing 14, which is fitted in the internal peripheral surface in the side of the speed change clutch 7 of this gear shaft cylinder, is prevented from coming off by a clip ring. A washer 17 and the like intervene among the end face of the gear shaft cylinder 13, ball bearing 5 and speed change clutch 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor transmission, and can be utilized as a transmission by traveling speed change and gear transmission.

[0002]

2. Description of the Related Art In a transmission transmission mechanism for a tractor, there are many forms in which a transmission clutch is shifted along the axial direction to select a transmission gear, and transmission is performed, but the gear width is large. The bearing spacing between the bearing bearings with respect to the bearing wall is long, the deflection of the shaft is large, and the assembly of the speed change transmission mechanism is likely to be complicated.

[0003]

According to the present invention, the front and rear portions of the PTO transmission shaft 1 in the axial direction are supported by the ball bearings 4 and 5 with respect to the bearing walls 2 and 3, and the ball bearings 4 before and after the bearings 4 and 5 are provided. Transmission gears 8 to 1 for shifting gears by shifting the transmission clutches 6 and 7 in the axial direction on the PTO transmission shaft 1 between 5
0 is rotatably arranged, and needle bearings 14, 15 for bearing the PTO transmission shaft 1 are provided on the inner peripheral surfaces of the front and rear end portions of a gear shaft cylinder 13 in which a plurality of gears 11, 12 are formed on the outer periphery. And a clip ring 16 for preventing axial disengagement of the needle bearing 14 from the inner peripheral surface of the gear clutch 7 side end portion, and the gear shaft cylinder 13
The washer 17 and 18 are interposed between the end surface of the ball bearing 5 and the ball clutch 5 and the speed change clutch 7, respectively, to form a tractor speed change device.

[0004]

The operation of the speed change transmission of the speed change clutches 6 and 7 is controlled by shifting the speed change clutches 6 and 7 in the axial direction by the speed change gears 8 to 11 selected by the shift of the speed change clutch 6 or 7. Gear transmission is performed.
Further, the transmission by the rotation of the PTO transmission shaft 1 is also performed.

The transmission is assembled by mounting the transmission clutch 6, between the ball bearings 4 and 5 at the front and rear of the PTO transmission shaft 1.
7 and shift gears 8-10, etc., which are shifted by this,
The gear shaft cylinder 13 having the speed change gear 11 and the gear 12 is fitted into bearings, and washers 18 and 17 are respectively provided between the front and rear end surfaces of the gear shaft cylinder 13 and the speed change clutch 7 and the ball bearing 5. Since they are interposed, the block assembly of the transmission gears 8 to 10 and the gear shaft cylinder 13 can be simplified.

The needle bearings 14 and 15 are on the inner peripheral surface of the end portion of the gear shaft cylinder 13, and the needle bearing 14 on the side of the speed change clutch 7 is retained and positioned in the axial direction by a clipping 16. In addition, the distance between the end surface of the gear shaft cylinder 13 and the speed change clutch 7 is also adjusted by the washers 17 and 18, so that the distance between the speed change clutch 7 and the speed change gear 11 is kept constant and the speed change clutch 7 is easily shifted.

The gear shaft cylinder 13 has needle bearings 14 and 15 at the front end portion and the rear end portion of the PTO transmission shaft 1.
Since it is a bearing that rotates around, it has a double shaft structure, and even if the bearing spans of the ball bearings 2 and 3 are long, it is possible to perform stable transmission with less vibration and distortion. It is possible to prevent the PTO transmission shaft 1 from moving around when the transmission of the PTO transmission shaft 1 is stopped.

[0008]

1 and 2, a transmission case 19 constituting a tractor vehicle body has a clutch housing 20 and an engine body connected to the front side, and a rear transmission case 21 connected to the rear side. This mission case 19
The front bearing wall 2 is removable with bolts or the like, and the rear bearing wall 3 is configured as a front wall of the rear transmission case 21. A traveling pinion shaft 22, a PTO transmission shaft 1, a front wheel output shaft 23, a reverse shaft 24 and the like are mounted on the mission case 19. The PTO transmission shaft 1 is provided with transmission clutches 6 and 7 which are main transmission devices, transmission gears 8 to 12 meshingly rotated by the transmission clutches, a gear shaft cylinder 13 and the like, and a pinion shaft 22 is provided with an auxiliary transmission. An auxiliary transmission gear 25, which is a device, is mounted on the front wheel output shaft 23.
6 is mounted. With these, the rear wheels and the front wheels can be transmitted.

The PTO transmission shaft 1 has a front portion bearing on a bearing wall 2 by a ball bearing 4 and a rear portion bearing a ball bearing 5.
Bearings on the bearing wall 3. The transmission shaft 1 includes a washer 27, a transmission shaft cylinder 30 whose front and rear ends are supported by needle bearings 28 and 29, a washer 18, and needle bearings 14 and 1 from the ball bearing 4 side to the 5 side.
The gear shaft cylinder 13 and the washer 17, etc., which are borne by 5, are fitted and inserted.

The needle bearings 28 and 29 are fitted to the inner peripheral surfaces of the front and rear ends of the gear shaft cylinder 30, and the needle bearings 14 and 15 are fitted to the inner peripheral surfaces of the front and rear ends of the gear shaft cylinder 13 to form a washer. The end faces of these barrels 30 and 13 are brought into contact with 27, 18 and 17. Reference numeral 31 is a clip ring for positioning which is fitted in a ring groove on the transmission shaft 1.

The transmission clutches 6, 7 are provided on the transmission shaft cylinder 30.
The slider portion is provided at the end of the shift shaft cylinder 30 so as to be axially shiftable with respect to the screwed boss portion, and can be integrally rotated by meshing with the slider portion by the shift clutches 6 and 7. The transmission gears 8, 9, 10 are rotatably supported by needle bearings 32, respectively, and a gear 33 is integrally provided at the front end portion.

A gear shaft cylinder 13 is integrally formed with a gear shift gear 11 capable of meshing with the gear shift clutch 7 and a gear 12, and a gear bearing 35 is rotatably mounted on a rear end thereof by a needle bearing 34. The needle bearing 14 on the front end side of the gear shaft cylinder 13 is stopped from moving in the axial direction by a clip ring 18 fitted in a ring groove formed on the inner circumference of the gear shaft cylinder 13.

An oil groove 3 is formed on the end surface of the washers 27 and 17.
6 is formed to supply lubricating oil to the end surfaces of the transmission shaft cylinder 30 and the gear 33 and the end surfaces of the gear shaft cylinder 13 and the gear 35 which are in contact with these end surfaces. An oil groove 37 is also formed on the end faces of the speed change shaft 30, the speed change clutch 7, the gear shaft cylinder 13 and the like that are in contact with the washer 18, and the gear 35 that is in contact with the washer 17 is also formed.
An oil groove 37 is also formed on the end surface of the.

A gear shaft cylinder 41, which forms gears 38, 39, 40 that directly mesh with the transmission gears 8, 10, 11 is mounted on the pinion shaft 22 via a needle bearing. An auxiliary transmission gear 25 that shifts in the axial direction to perform an auxiliary transmission is provided between the rear end of the gear shaft cylinder 42 and the rear end of the gear shaft cylinder 42. Further, the gear 43 meshing with the gear 35 is integrated. The gear 44 integrated with the gear shaft cylinder 42 is the gear 12
The gear 45 meshes with the creep gear 46 on the creep shaft 45, which is mounted on the side of the transmission case 19, and the auxiliary transmission gear 25 is shifted to mesh with the creep gear 47. It is possible to perform a creep shift of.

The pinion gear 4 at the rear end of the pinion shaft 22.
8 is configured to mesh with a ring gear 49 of a differential device inside the rear mission case 21, and differentially interlock a rear axle in an axle housing connected to both left and right sides of the rear mission case 21. The transmission gear 9 and the gear 39
And are engaged with each other as a reverse transmission via the back idle gear 50 on the reverse shaft 24. The gear 35 at the rear end of the gear shaft cylinder 13 is meshed with the clutch gear 26 on the front wheel output shaft 23 so that the front wheel can be interlocked.

The clutch housing 20 is coaxial with the pinion shaft 22, and has a shaft 51 and a coupling 52.
An interlocking shaft 53 connected via a shaft, a front end of the transmission shaft 1 connected by a coupling 54, a coaxial PTO output shaft 55 mounted, and an idle shaft 56 having an idle gear 57. To wear. Engine side output gear 58 to shaft 51
When the clutch 62 is continuously transmitted to the forward rotation gear 60 side via a switching clutch 62 which is meshed with the gear 59 and is switched and shifted between the forward rotation gear 60 and the reverse rotation gear 61 along the shaft 51, The gear 63 and the PTO output shaft 55 are normally rotated. When the clutch 62 is connected to the reverse rotation gear 61 side, the gear 64 and the PTO output shaft 55 are transmitted in reverse rotation via the idle gear 57. Accordingly, the interlocking shaft 6 interlocked with the rear end of the transmission shaft 1 via the coupling 65.
6 and the PTO shaft projecting to the rear of the rear mission through the PTO gear and the like. When the switching clutch 62 does not mesh with any of the gears 60 and 61, the PTO shaft is not driven.

The shaft 51 interlocks with an interlocking shaft 53 borne by the bearing wall 2, and a gear 67 of the interlocking shaft 53 meshes with the gear 33 to interlock with the main transmission device, the subtransmission device, and the creep transmission. It is transmitted to devices. 3 and 4, the difference from the above example is that the switching clutch 6 on the shaft 51 is different.
Reference numeral 2 constitutes a reversal clutch, and the gear 59 is rotatably provided on the shaft 51 and is integral with the forward rotation gear 60, and always transmits the PTO output shaft 55 on the PTO transmission shaft 1 side. The reversing clutch has a synchronized form.

The bearing wall 2 of the mission case 19
A shift clutch case 68 is attached to the front side of the clutch housing 20 and is positioned in the clutch housing 20. In the speed change clutch case 68, between the front wheel output shafts 23 and 78, a wet multi-plate type constant speed clutch 69 and a double speed clutch 7 are provided.
0, and when the hydraulic pressure of the operation cylinder piston 71 is expanded and contracted to release the hydraulic pressure of this piston 71, the constant speed clutch 69 is engaged by the spring 72 pressure, and the front wheel output shaft 2
3 through the constant speed clutch 69 to the shaft 78, and the front wheel is transmitted to the rear wheel at a substantially constant speed. Further, when the piston oil pressure is pressed against the spring 72, the double speed clutch 70 is engaged and the constant speed clutch 69 is disengaged, and the rotation of the front wheel output shaft 23 is transmitted through the gears 73 to 76 to the clutch body 77.
To 78.

The front end of the PTO transmission shaft 1 is borne by a bearing 79 in the case 68, and the bearing 79 is positioned by a clip ring 80 fitted in a ring groove of the PTO transmission shaft 1. Also, the interlocking shaft 5
Bearings are provided in three cases 68. In FIG. 5, the difference from the above example is that the drive of the PTO transmission shaft 1 is
A gear 33, which is integral with the front end portion, is transmitted to the PTO transmission shaft 1, and gear shift clutches 6 and 7 for main gear shift are directly provided on the PTO transmission shaft 1 to transmit gears to the pinion shaft 22 side.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a transmission device.

FIG. 2 is an enlarged view of the transmission shaft portion.

FIG. 3 is a vertical sectional side view showing another embodiment.

FIG. 4 is an enlarged view of the transmission shaft portion.

FIG. 5 is an enlarged view of a transmission shaft portion showing another embodiment.

[Explanation of symbols]

 1 PTO transmission shaft 2 bearing wall 3 bearing wall 4 ball bearing 5 ball bearing 6 speed change clutch 7 speed change clutch 8 speed change gear 9 speed change gear 10 speed change gear 11 speed change gear 12 speed change gear 13 gear shaft cylinder 14 needle bearing 15 needle bearing 16 clip ring 17 washer 18 washer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Ishimaru 1 Yakura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A PTO transmission shaft 1 has an axial front portion and a rear portion which are supported by ball bearings 4 and 5 against bearing walls 2 and 3, and PTO between the front and rear ball bearings 4 and 5.
On the transmission shaft 1, transmission gears 8 and 10 for shifting the transmissions by shifting the transmission clutches 6 and 7 in the axial direction are rotatably arranged.
Needle bearings 14 and 15 for bearing the PTO transmission shaft 1 are fitted to the inner peripheral surfaces of the front and rear end portions of a gear shaft cylinder 13 having a plurality of gears 11 and 12 formed on the outer periphery thereof, and the speed change clutch 7 A clip ring 16 for preventing axial disengagement of the needle bearing 14 is fitted to the inner peripheral surface of the side end portion, and between the end surface of the gear shaft cylinder 13 and the ball bearing 5 and the speed change clutch 7. Each washer 1
A transmission for a tractor having 7 and 18 interposed.