JP3097632B2 - Traveling gear for working vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling transmission device provided in various working vehicles such as a combine.

[0002]

2. Description of the Related Art Conventionally, a working vehicle such as a combine is provided with a pair of left and right endless traveling devices. Then, keep the turning radius small to make small turns,
Further, in order to enable a reliable turn even on a weak running road surface, a configuration in which the left and right running devices are driven and rotated in opposite directions to each other so as to perform a sharp turn called a so-called super pivot turn. is there.

As disclosed in Japanese Utility Model Laid-Open Publication No. 55-161659, for example, a traveling transmission device which is configured to be capable of turning in a pivot position is disclosed. Left and right side clutch gears that can be disengaged and disengaged, left and right output gears that mesh with the side clutch gears, and a reverse rotation transmission mechanism that reversely drives the left and right output gears from the one left and right side clutch gears. There is a configuration.

In such a configuration, if the left and right side clutch gears are engaged with the center gear, and the center gear is driven and rotated in this state, both the left and right output gears rotate in the same direction. The vehicle goes straight. Then, the left and right side clutch gears are engaged with the center gear, the left and right side clutch gears are disengaged, and the reverse rotation transmission mechanism is set in a transmission state. In this state, the center gear is driven and rotated. For example, the left and right output gears rotate forward, and the left and right other output gears are reversely driven from the left and right side clutch gears via a reverse rotation mechanism. That is, the output gear on the side from which the transmission from the center gear has been separated is driven to reversely rotate from the side clutch gear on the side connecting the transmission to the center gear via the reverse rotation mechanism.

[0005]

SUMMARY OF THE INVENTION In the prior art,
For example, in the case of performing a pivot turn in the configuration disclosed in Japanese Utility Model Application Laid-Open No. 55-161659, as described above, the output gear on the side from which transmission from the center gear has been separated is replaced with the center gear. A reverse rotation is driven from the side clutch gear on the side to which the transmission is connected via a reverse rotation mechanism. That is, from the left and right side clutch gears that connect the transmission to the center gear, the right and left one side output gears are driven forward,
Both the left and right output gears are reversely driven.

For this reason, the load at the time of turning drive is concentrated on the left and right side clutch gears, and the load disengages the side clutch gear from the center gear, thereby preventing the turning. And there was a fear that work running would be hindered.

[0007]

The present invention employs the following technical means in order to solve the above-mentioned problems. That is, the center - a gear 14, the center - a rotating body 7,7 of the left and right rotatable in opposite directions relative to the gear 14, the center - selectively to either the gear 14 and the rotating body 7,7 and engageable with the left and right side clutch gear 19 and 19, the side clutch Rutotomoni provided with right and left output gear 21 meshing with the gear 19, 19, the left and right rotator 7,
7 is rotated in the opposite direction to the center gear 14
And a state in which it is switchable between a non-rotatable state and a non-rotatable state .

With this configuration, the left and right side clutch gears 19, 19 are engaged with the center gear 14, and when the center gear 14 is driven and rotated in this state, the right and left side clutch gears 19, 19 mesh with the left and right side clutch gears 19, 19. Output gears 21 and 21 rotate in the same direction to drive the left and right traveling devices together in the same direction, and the working vehicle goes straight. The straight traveling direction is switched between forward and reverse by changing the driving rotation direction of the center gear 14.

Further, the left and right side clutch gears 19
Is engaged with the center gear 14, while the left and right side clutch gears 19 are disengaged from the center gear 14 to secure
Switching to the state of rotating in the opposite direction to the center gear 14
When the output gear 21 is engaged with the left and right side clutches 19, the output gear 21 on the side meshing with the left and right side clutch gears 19 rotates forward, while the output gear 21 on the side meshing with the left and right other side clutch gears 19 is rotated. Reverses. As a result, the left and right traveling devices are driven in opposite directions to each other, and the working vehicle makes a sharp turn, such as a pivot turn.

As described above, the left and right output gears 21 and 21 for driving the left and right traveling devices in opposite directions during a sharp turn such as a super-revolution turn are left and right independent by the center gear 14 and the rotating body 7. , The load applied to each engaging portion during the turning drive is dispersed, and the side clutch gears 19 and 19 and the center gear
Is less likely to be disengaged.

In the case where the left and right side clutch gears 19 are engaged with the center gear 14, while the other left and right side clutch gears 19 are disengaged from the center gear 14 to be in a non-transmission state, The configuration may be such that the working vehicle makes a gentle turn. Also, the left and right side clutch gears 19
Engage with the center gear 14, while the other side on the left and right
The clutch gear 19 is separated from the center gear 14 and rotated.
To the rotating body 7 switched to the state of
Then, it engages with the one side clutch gear 19 on the left and right sides.
The output gear 21 on the rear side rotates forward, while the support gears on the other side on the left and right sides.
The output gear 21 on the side meshing with the id clutch gear 19 is controlled.
Be moved. As a result, the right and left traveling devices are braked.
The working vehicle turns.

[0012]

As in the above, according to the present invention, in the present invention, cell
And the center gear 14 in the opposite direction.
Left and right rotating bodies 7, 7 rotatable in the center and the center gear
14 that can be selectively engaged with one of the rotating bodies 7 and 7
Right side clutch gears 19, 19 and
Left and right output gears 21 and 21 meshing with the gears 19 and 19, respectively.
And the right and left rotating bodies 7, 7 are
-Rotation in the opposite direction to the gear 14 and non-rotation
It can be switched to a fixed state.
Since the traveling power transmission device of the working vehicle is used, it is possible to smoothly perform a sharp turn such as a pivot joint turn and a turn for braking the left and right traveling devices, thereby improving the work traveling.

[0013]

Embodiments of the present invention will be described.
In the illustrated example, the transmission case 9 has an input shaft 1, a transmission shaft 5, an intermediate shaft 6, a steering clutch shaft 4, a pair of left and right running shafts 10 and the like arranged from the upper part to the lower part. The output shaft 11 of the hydraulic continuously variable transmission HST is connected to one end of the hydraulic transmission 1 and the input shaft 12 of the hydraulic continuously variable transmission HST is transmitted from the engine to the transmission shaft 10.

On the input shaft 1, there are provided auxiliary transmission gears L, M, H which can be moved and shifted by a transmission lever, and a transmission gear.
A reverse drive gear 12 is provided near one side of the gear 9. On the transmission shaft 5, each gear 13 meshable with the sub-transmission gears L, M, H, the gear 15 constantly meshing with the center gear 14 on the steering clutch shaft 4, and meshing with the reverse drive gear 12 The reverse gear 8 is provided so as to be rotatable and movable in the axial direction. Opposite to the reverse gear 8, the transmission case 9 is provided with a fixing device 16 of an occlusal form for locking the rotation around the intermediate shaft 6 by axial movement, and the reverse gear 8 is attached to the reverse drive gear 12. When they are engaged, the fixing device 16 is disengaged,
Conversely, when the engagement with the reverse drive gear 12 is released, the fixing device 16 is engaged.

On the intermediate shaft 6, there is provided a gear 17 which is always meshed with the brake gear 7 (rotary body 7) on the steering clutch shaft 4, and this one gear 17 and the reverse gear 8 are always meshed. I have to. On the steering clutch shaft 4, clutch teeth 18 are formed on both sides of a center gear 14 at a central portion, and a clutch gear 19 that is axially movable and rotatably mounted.
The clutch teeth 20 are formed at the inner end of the (side clutch gear 19), and the left and right steering clutches 2 are constituted by the engagement and disengagement of these two clutch teeth 18, 20. A brake gear 7 is provided outside the clutch gear 19 so as to be rotatable with respect to the steering clutch shaft 4, and a multi-plate clutch type steering is provided between the brake gear 7 and the clutch gear 19. By providing the brake 3 and moving the clutch gear 19 to the outside, the steering brake 3 can be pressed against and integrated with the brake gear 7.

A gear 21 (output gear 21) is fixed to the pair of right and left traveling shafts 10, and is always meshed with an opposing clutch gear 19. At the outer end of the traveling shaft 10, a sprocket 22 is provided in the crawler traveling device, and a rear wheel or the like is provided in the wheel traveling tractor. The hydraulic continuously variable transmission HST
When the shift lever 23 is rotated from the neutral position N to the forward position F, the forward shift is sequentially in the high-speed range, and when the reverse lever R is rotated, the reverse shift is sequentially in the high-speed range. The shift can be performed, and this is set as a main shift.

The transmission gears L, M, and H on the input shaft 1 that are shifted in this manner are operated by a transmission lever or the like, and are transmitted to the center gear 14 as an auxiliary transmission. Operation lever-2
Reference numeral 4 denotes a switch for switching the reverse gear 8, which is operated toward the fixing device 16 during normal turning to disengage with the reverse driving gear 12 (FIG. 2), and reverses the reverse gear 8 during sudden turning. Engage with the drive gear 12 (FIG. 1).

The clutch gear 19 of the steering clutch 2 is interlocked with a shifter 26 which is operated by a hydraulically operated push cylinder 25. The rotation of the shifter 26 allows the clutch to be engaged, disengaged, braked, and the like. Actuated for each position. In FIG. 3, the hydraulic circuit 27 of the push cylinder 25 has a hydraulic pump P, a steering control valve 30 and the like which can be switched through switches and solenoids 28 and 29 by operating a steering lever 32, and the like. The push cylinder 25 on the side switched by the steering control valve 30 is operated, and the shifter 26 is operated. A power steering circuit 31 is provided between the push cylinders 25 and communicates with the hydraulic circuit 27 when the cylinder piston is pushed to a certain degree or more, and a power steering valve 33 whose drainage pressure is adjusted by a steering lever 32 is provided. The steering control valve 30 is provided.
With the switching, the pressure in the push cylinder 25 can be adjusted according to the inclination angle of the steering lever 32, and the push cylinder 25 can be used to perform operations such as braking and reverse rotation.

Further, the speed change lever 23 is provided with a contact by a push button 34, and when the push button 34 is pressed, the tank port of the hydraulic circuit 27 and the power steering circuit 31 are operated.
The reverse rotation solenoid valve 35 that shuts off oil discharge to the port T can be switched. As a result, the pressures of the left and right push cylinders 25 increase, and the left and right steering brakes 3 are pressed against the brake gear 7 by the shift movement of the clutch gear 19 by the shifter 26 to be integrated together. Therefore,
At this time, by operating the operation lever 24 to engage the reverse rotation gear 8 with the reverse rotation drive gear 12, the left and right brake gears 7 can be engaged.
Are reversely rotated together to reversely transmit the left and right traveling shafts 10,
You can go backwards.

The switching between forward and backward movement of the body by the speed change lever 23 requires a long stroke operation and time to perform a deceleration and speed-up process once through the neutral position N, and particularly when turning back and forth. In this case, it is time-consuming to switch between forward and reverse. However, as described above, the push-button switch of the shift lever 23 is used to quickly switch between forward and reverse while maintaining the main shift position by the shift lever 23. It can be carried out.

In FIG. 4, the difference from the above example is that the gear 36 fixed on the speed change shaft 5 and the gear 17 on the intermediate shaft 6 are always set in a meshing state, and the structure of the reverse gear 8 is changed. It is a substitute. Since the center gear 14 and the brake gear 7 of the steering clutch 2 rotate in mutually opposite directions, the steering gear 3 on one side is operated by the clutch gear 19.
When is pressed, it is possible to make a sharp turn because it is reversely rotated. Therefore, the operation is different from the operation in which the reverse gear 8 is fixed by the fixing device 16 and only the steering brake is effective as in the previous example. However, depending on the degree of the pressure contact force of the steering brake 3, the reverse rotation is performed. Steering brake can be applied to prevent rotation in the normal rotation direction in a range where the motor does not rotate. In such a configuration, the simultaneous forward / reverse switching of the left and right traveling shafts 10 by the push button switch of the shift lever of the previous example is similarly performed.

The operation of the above configuration will be described. By the transmission of the input shaft 1, the power is transmitted to the steering clutch 2 on the steering clutch shaft 4 via the transmission gears of the transmission transmission system on the transmission shaft 5 and the intermediate shaft 6, and from the steering clutch 2, the left and right traveling shafts. It can be driven by being transmitted to. When either the left or right of the steering clutch 2 is turned off, the traveling transmission on the side where the steering clutch 2 is disengaged stops, and the steering is steered toward the disengagement side.

The reason why the steering brake 3 is activated when the steering clutch 2 is disengaged is that the brake gear 7 does not rotate when the reverse rotation gear 8 is fixed in a non-rotatable state.
The key 3 operates after the steering clutch 2 is disengaged, and the turning of the traveling shaft on the side where the steering clutch 2 is disengaged is braked, so that the turning can be effectively performed. When the reverse rotation gear 8 is reversely transmitted to make a sharp turn, the steering brake 3 on the clutch disengagement side is braked and the reverse rotation of the reverse rotation gear 8 is started from the disengagement state of the steering clutch 2 as described above. By the transmission, the transmission from the input shaft 1 to the intermediate shaft 6 is reversely rotated, and the brake gear 7 is reversely transmitted to the steering clutch shaft 4, so that the side to which the steering brake 3 is connected. The steering clutch 2 and the traveling device constantly meshing with the steering clutch 2 are reversely rotated to make a sharp turn.

As described above, when making a sharp turn by rotating the traveling device on the turning side in the reverse direction, the input shaft 1 is transmitted separately from the input shaft 1 and transmitted to the steering clutch 2 as a separate system. Is transmitted to the brake gear 7 through the reverse gear 8 from the gear, so that even if the traveling speed changes due to the transmission of the transmission, the reverse transmission ratio by the reverse transmission system does not change, and it is not only low speed but also medium speed. Drive torque during cornering in high and high speed ranges can be stabilized.

[Brief description of the drawings]

FIG. 1 is a front view showing a transmission mechanism according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of a part of the transmission mechanism according to the embodiment of the present invention.

FIG. 3 is a hydraulic operation circuit diagram according to the embodiment of the present invention.

FIG. 4 is a front view showing a transmission mechanism according to another embodiment of the present invention.

[Explanation of symbols]

 7 Rotating body 14 Center gear 19 Side clutch gear 21 Output gear

Claims (1)

(57) [Claims] 1. A center gear 14 and a center gear 1
A rotating body 7,7 of the rotatable lateral in the opposite direction to 4,
Left and right side clutch gears 19, 19 selectively engageable with either the center gear 14 and the rotating bodies 7, 7
When the rotation Rutotomoni, the right and left is provided an output gear 21 of the right and left meshing with the side clutch gear 19, 19
The bodies 7, 7 are rotated in the opposite direction with respect to the center gear 14.
Configuration that can be switched between a locked state and a non-rotatable fixed state.
Traveling transmission apparatus of a working vehicle, characterized in that the.