JPH06337065A - Transmission operation device for tractor - Google Patents

Abstract

PURPOSE:To enable a transmission case or the like to be used in common and facilitate the change of specification for transmission operation by providing a shifter case at a shifter port detachably for simplifying power transmission constitution in the case. CONSTITUTION:A shifter case 5 to house a shifter stay 3 having a transmission shifter 2 for gearing a transmission device in a transmission case 1 and a shifter lead cam 4 to operate the shifter 2, is provided at the outside of the shifter port 6 of the case 1, thereby constituting a transmission operation device for a tractor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change operation device for a tractor, and can be mainly used as an operation device for an auxiliary speed change device.

[0002]

2. Description of the Related Art The transmission case of a tractor is complicated because it has many clutches and operating mechanisms for gear shifting, and therefore is complicated with the transmission structure. It is difficult to change the operation specification by making the constituent parts different, and the cost tends to be remarkably high. The present invention simplifies the power transmission structure in the mission case, easily attaches the operation mechanism according to the operation mode, and facilitates the change of the shift operation specification.

[0003]

According to the present invention, there is provided a shifter steer-3 having a shifter shifter-2 for shifting a transmission in a transmission case 1, and a shifter lead cam 4 for operating the shifter shifter-2. A shift operation device for a tractor is constructed by mounting a shifter case 5 in which is mounted on the outside of a shifter port 6 of the transmission case 1.

[0004]

By operating the shift lever, the shifter lead cam 4 in the shifter case 5 is rotated, and the shift shifter-2 is moved along the shifter step-3. As a result, the transmission in the transmission case 1 is shifted. Thus, the shifter case 5 is used to attach the shifter steer-3 having the shift shifter-2, the shifter cam 4 for operating the shifter shifter-2 and the like at the outer shifter port of the mission case 1. Therefore, the mission case 1 and the transmission in the mission case 1 can have a compact structure, and a part of the operation mechanism on the shifter case 5 side is
For example, even in the case of different operation modes or specifications such as the operation lever mode and the motor drive mode, the mission case 1
It is easy to share the and make it economical.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor vehicle body is constructed by integrally connecting a clutch housing 7 having an engine body connected to the front side, a front mission case 1, a rear mission case 8 and the like. Above the rear mission case 8, a hydraulic case 1 having an arm shaft 9 for rotating a lift arm and the like is provided.
0, and the rear axle housings 12 on which the rear wheel shafts 11 are mounted are provided on both left and right sides to be interlocked. Further, a front axle housing for mounting a front wheel shaft by a front axle bracket is provided at a front portion of the engine, and front and rear wheels are driven by transmission from a transmission device in the transmission cases 1 and 8. It is a four-wheel drive traveling mode in which the vehicle can travel.

Reference numeral 13 is a fender for covering the rear wheels, 14 is a pilot seat provided between the left and right fenders 13, and a steering handle for steering the front wheels is located in front of the pilot seat 14 and above the clutch housing 7 part. Although it is installed on the upper part of the steering post, the shift lever 15 is located on the cockpit 14
Is located inside the fender 13 on the left side of the.

The clutch housing 7 and the transmissions in the front and rear transmission cases 1 and 8 are of a wet multi-plate type in which transmission is made from an input shaft 16 input from a crank shaft of an engine to a clutch shaft 17. A clutch 18, a multi-plate type reverser clutch 20 for transmitting the power from the clutch shaft 17 to a forward rotation and a reverse rotation and transmitting it to a reverser shaft 19, and the main transmission shaft by the transmission from the reverser shaft 19. 20 is a main gear shift clutch 22 in a synchro mode that is switched between the transmission gears 21 on the main gear 20 and a sub gear in a synchro form that is switched between the transmission gears 24 on the auxiliary transmission shaft 23 by transmission from the main transmission shaft 20. A transmission clutch 25 and a differential device 26 that interlocks with the left and right rear wheel shafts 11 from the sub-transmission shaft 23 are provided for transmission to the rear wheels.

Further, in order to transmit the power from the auxiliary transmission shaft 23 to the front wheels, the front wheel input shaft 31 and the front wheel input shaft 31 are transmitted.
It has a multi-plate type front wheel clutch 33 and the like, which switches the rotation to the same rotation or double rotation to the front wheel output shaft 32 and transmits the same.
Further, a PTO clutch shaft 27 for transmitting the PTO shaft at the rear end of the rear transmission case 8 from the clutch shaft 17 is used.
On the shaft 27, a PTO forward / reverse switching clutch 29 that is switched over between the forward / reverse switching gear 28, and further, P
A TO interlocking shaft 30 and the like are provided. A PTO transmission gear is provided at the rear end of this.

From the gear 34 of the main clutch 17, through the counter gear shafts 35 and 36, the reverser shaft 19 is provided.
The power is transmitted to the upper reverser gears 37 and 38, and is transmitted from the counter gear shaft 35 directly or through the counter gear shaft 36.
It is transmitted to each transmission gear 28 on the TO clutch shaft 27. Three
A counter gear shaft 9 has a counter gear 40 meshing with the main transmission gear 22.

Reference numerals 41, 42 and 43 denote counter gear shafts of the auxiliary transmission gear 24, which have counter gears 44, 45 and 46 meshingly transmitted from a gear 47 of the main transmission shaft 20, of which the counter gear shaft 43 is Sub-transmission gear 24 to gear 4
The transmission is decelerated via 8 and the counter gear 46 is transmitted.
Further, the high speed auxiliary transmission gear 24 is directly meshed with the gear 47 for transmission.

A shifter is provided on the upper side of the mission case 1.
The mouth 6 is opened, and the pair of front and rear shift shifters 2 inserted from the shifter mouth 6 are engaged with the pair of sub-shift clutches 25 on the sub-shift shaft 23 to make a low low speed LL and a low speed L. , The middle speed M, and the high speed H can be operated in the auxiliary shift positions. A shifter case 5 attached to the upper and outer side surfaces of the shifter port 6 is provided with a shifter steer 3 in parallel with the auxiliary transmission shaft 23 and the like, and a shifter lead cam 4 is provided on the lateral side of the shifter steer 3.
Is provided by a lead cam shaft 49, and this shifter
The shifter pin 51 of the shift shifter-2 is engaged with the cam groove 50 formed on the peripheral surface of the drive cam 4, and the shifter-lead cam 4 rotates about the lead cam shaft 49 to shift the shifter-2. Is moved along the shifter steering 3, and the auxiliary shift clutch 25 is operated back and forth to perform the auxiliary shift.

At the rear end portion of the lead cam shaft 49, an operating shaft 52 driven by the shift operation of the auxiliary shift lever 15.
Are interlocked via the bevel gear 53. The operation shaft 52, the bevel gear 53 and the like are provided in an operation case 54 which is continuously provided at the rear end of the shifter case 5. On the opposite side of the operation case 54, directly from the auxiliary shift lever 15 (FIG. 7),
Alternatively, a speed-changing arm 56 that is rotated via a link mechanism 55 (FIGS. 8 and 9) can freely rotate back and forth around an arm shaft 57, and the lower end of the speed-changing arm 56 has a symmetrical shape in the front-rear direction. A ratchet arm 59 having a speed change pawl 58 is pivotally supported 60 so as to be vertically swingable. Further, a ratchet disk 62 at the tip of the operation shaft 52 is provided with a speed change pin 61 driven by the engagement of the speed change claw 58, the number of shifts H, M, L of the auxiliary speed change.
Depending on LL, the ratchet arm 59 is swung by the forward / backward rotation of the speed change arm 56, and the speed change pawl 58 engages the speed change pin 61 while the pitch direction is either forward or reverse. And the operating shaft 52 is interlocked. Further, cams 63 and 64 are formed on the outer periphery of the ratchet disk 62, and the rotational position of the operation shaft 52 can be stabilized at each gear shift position or neutral position by the sliding contact of the cam followers 90 and 91. Is configured. Reference numeral 65 is a spring provided around the arm shaft 57 for returning to the neutral position.

The auxiliary shift lever 15 is pivotally supported 68 on the operation floor 66 inside the fender 13 and is mounted on the guide panel 67. On the control floor 66, the PTO gear shift lever 6 is provided in front of the auxiliary gear shift lever 15.
9 is provided. The PTO shift lever 69 is pivotally supported 70 on the upper side of the transmission case 1 along the upper portion of the operation case 54.

The main shift buttons 71, 7 are provided on the sub-shift lever 15.
2 every time the main transmission button 71 is pressed, the main transmission is accelerated one step at a time, and conversely, every time the main transmission button 72 is pressed, the main transmission can be decelerated by one step. Also, this sub-shift lever-1
In the gear shift operation of No. 5, by selecting the automatic main shift mode in advance, the main shift device is automatically accelerated or decelerated by shifting the auxiliary shift lever 15 to change the gear ratio of the vehicle speed. The shift in the smallest area is selected.

9 to 12, a shifter case 5 of another form is provided in place of the shifter case 5 described above.
An operating shaft 73 that is operated by directly connecting the auxiliary shift lever,
The shifter arm 74 fixed to this tip and the shifter shifter
It has a shifter 3 having 2 and the like, and is detachably attached to the upper side of the shifter port 6. The operating shaft 73 is slidable in the lateral direction, and a shifter arm 74 at the tip is switchably engaged with a shifter recess 75 of the shifter shifter-2.

Shifter ports 76 and 77 are formed on both left and right sides of the front transmission case 1 of the main transmission, and the main transmission clutch 22 is operated outside the shifter ports 76 and 77. Shifter cases 78, 79 for detaching are provided detachably. Further, as described above, the main shift clutch 22 is connected to the main shift buttons 71, 72 and the sub shift lever.
In the automatic main shift mode by 15, the shifter of the main shift clutch 22 is provided with a push cylinder by a hydraulic circuit.
In order to operate the hydraulic shift unit 80 such as the push cylinder and the hydraulic valve, the shifter case
It may be attached instead of the sleeve 79.

The operation shaft 81 is provided with right and left shifter cases 78,
It has a shifter arm 82 which is supported between 79, is rotatable and slidable, and is close to the shifter case 79 side. The shift shifter 83 for operating the main shift clutch 22 is a shifter.
It is supported by the shifter station 84 on the mouth 77 side. By operating the operation shaft 81, the shifter arm 82 is moved to each shift shifter 83.
The main shift operation can be performed by switchingly engaging the shifter concave portion 85 of FIG.
Reference numeral 86 is a guide plate of the shifter arm 82.

A shifter port 87 is formed on the side surface of the transmission case 1 facing the front wheel clutch 33 so that the shifter case 88 can be attached and detached. The shifter case 88 has a shifter arm 89. Since the front wheel clutch 33 has a structure in which a multi-plate clutch can be hydraulically switched by a hydraulic push cylinder, the shifter port 87 can be operated by attaching a hydraulic shift unit 92 such as a hydraulic pressure switching valve for operating the shifter port 87. However, instead of such a hydraulic push cylinder or multi-disc clutch configuration, when a configuration such as a gear change shift is adopted, the shifter arm 89 is used for operation.

[Brief description of drawings]

FIG. 1 is a side view of an auxiliary transmission section.

FIG. 2 is a plan view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a side view of a part thereof.

FIG. 5 is a side view of a clutch housing portion.

FIG. 6 is a side view of the mission case.

FIG. 7 is a side view of a part of the vehicle body.

FIG. 8 is a side view of a sub-transmission unit showing another embodiment.

FIG. 9 is a rear view thereof.

FIG. 10 is a side view of a mission case portion and the like showing another embodiment.

FIG. 11 is a rear view of the sub transmission unit.

FIG. 12 is a rear view of the main transmission unit.

FIG. 13 is a plan view thereof.

[Explanation of symbols]

 1 mission case 2 speed shifter 3 shifter steer 4 shifter lead cam 5 shifter case 6 shifter port

Claims (1)

[Claims] 1. A shifter case 5 having a shifter steer-3 having a shifter shifter-2 for shifting a transmission in a transmission case 1 and a shifter lead cam 4 for operating the shifter shifter-2. , The mission case 1 shifter
A gear shifting operation device for a tractor attached to the outside of the mouth 6.