JP3198727B2 - Power transmission system for powered 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 such as a combine and the like, which selects a variety of steering and turning modes by mode switching operation, and which is appropriately steered and turned according to running conditions, working conditions and the like. Is performed.

[0002]

2. Description of the Related Art In a conventional combine traveling device, a pair of right and left crawlers is used.
Steering or pivoting is performed by a pair of left and right steering clutches, steering brakes, and the like. Further, in narrow places, the crawler on the turning side is driven in reverse to turn sharply (spin turn).
Power transmission configuration that can perform However, depending on running soil conditions, working conditions, and the like, there is a case where it is desired to drive the vehicle by changing the transmission ratio of the left and right crawlers.

[0003] In the pivot turn, the inner crawler is not driven and is fixed by the brake, so that it easily sinks on a soft soil surface, and often digs into the soil surface to scrape mud. Further, the spin turn is narrow and is effective when the turning diameter is reduced. However, when traveling at a relatively high speed, there are cases where it is desired to increase the turning diameter, and in soft soil, it is easy to obtain a turning that is unlikely to sink due to the high speed.

[0004]

SUMMARY OF THE INVENTION The present invention provides
Proposed to solve various problems, the following
Such technical measures were taken. That is, the main transmission 1 and the sub
The right and left independent steering on the steering clutch shaft 4 is provided.
In the power vehicle having the direct clutch 3, the main transmission
The rotational power shifted by the transmission 1 and the auxiliary transmission 2 is steered.
While transmitting to the latch shaft 4,
Set the running mode of the line device to pivot, differential,
Provision of means to switch between pin turns and differential turns
The mode is configured so that the transmission ratio can be changed to multiple stages
The configuration of a traveling transmission device for a powered vehicle characterized by the following.

[0005]

The transmission to the traveling device is transmitted from the main transmission 1 to the steering clutch gear 3 via the auxiliary transmission 2, and when the pair of left and right steering clutch gears 3 is engaged, the left and right traveling devices are transmitted. Is transmitted by the same rotation and travels straight. At this time, if either the left or right steering clutch gear 3 is turned off by operating the steering clutch gear 3 with a steering lever or the like, the transmission of the traveling device on this cut side is cut off,
Steering to the left or right, i.e. the running direction can be changed and modified.

At the time of the steering turn, the soil condition of the field,
The driving mode inside the turn is appropriately switched based on the
Select one of bot turn, differential turn, and spin turn
I do. For example, to activate a pivot turn,
With the clutch 6 on the off side of the steering clutch gear 3 engaged,
And apply a brake to the clutch gear 3 on the steering side
Make a pivot turn .

When the differential turn is selected, the transmission
Change the ratio to a low-speed differential turn that turns at a relatively low speed.
Or perform a double-speed differential turn that turns at high speed.
Also, when the steering clutch gear 3 on the steering side is reversed, the spinning occurs.
Turn to the turn mode and turn the aircraft with a small turning radius.
Can be.

[0008]

The present invention relates to a main transmission 1 and an auxiliary transmission.
2 on the steering clutch shaft 4
The main transmission 1 and the power transmission
The steering power is transmitted to the steering clutch
Traveling device that is configured to transmit to the shaft 4 and that is inside the turn
The driving mode can be changed to pivot turn, differential turn,
Means to selectively switch between the
Is characterized in that the transmission ratio can be changed to multiple stages
The configuration of the traveling transmission for a powered vehicle
Turning according to the soil conditions and work content of
It has the feature that the operability is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combine accommodates a body 8 having a pair of right and left crawlers 7, a cutting device 9, a threshing device 10 for threshing by receiving the supply of grain culms conveyed by the cutting device 9 and threshing grains. A Glen tank 11, an engine for driving these, a cockpit 12 and the like are mounted. A power steering lever 14 also serving as a steering lever can be tilted in the left and right direction and the front and rear direction on the control table 13 in front of the cockpit 12. The steering is performed by the left and right tilt operation, and the reaper is operated by the front and rear direction operation. 9 can be lifted and lowered. An HST lever 15 for shifting the hydraulic continuously variable transmission HST, which is the main transmission 1, an auxiliary shift lever 16 for shifting the auxiliary transmission 2, and a mode switching lever for switching the steering rotation mode are provided on the control table 13. 17 and a shift differential lever 18 for shifting the mode transmission 5.

The shaft 20 of the sprocket 19 for driving the left and right crawlers 7 is driven by the engine from the hydraulic continuously variable transmission H.
The belt is transmitted to the input shaft 21 of the ST, and is transmitted from the output shaft 22 to the input shaft 24 of the transmission case 23. The auxiliary transmission 2, the mode transmission 5, the pair of left and right steering clutch gears 3 in the transmission case 23 are transmitted. Transmitted through the like.

An input shaft 24 is provided in the transmission case 23.
The intermediate shafts 25 and 26, the steering clutch shaft 4, and the like are arranged between the shaft and the sprocket shaft 20. By operating the auxiliary transmission gear 27 on the input shaft 24 with the auxiliary transmission lever 16, the auxiliary transmission gear 27 is switched and meshed with the gear 28 on the intermediate shaft 25, and together with the shift of the intermediate shaft 25, the gear 28 The center clutch gear 29 on the steering clutch 4 interlocked with the section is shifted.

The pair of left and right steering clutch gears 3 is operated by a shifter 31 operated by a hydraulically operated push cylinder 30, and the center clutch gear 29 is operated.
Is turned on and off. When the left and right steering clutch gears 3 are in the engaged position, the right and left sprocket shafts 20 are driven via the wheel gears 32 constantly meshing with the two steering clutch gears 3 to enter a transmission state of straight running.
When one of the left and right steering clutch gears 3 is engaged with the center clutch gear 29 and is in the engaged position, and the other steering clutch gear 3 is in the disengaged position, the disengaged sprocket shaft 20 is Since it is not driven, it is turned around the crawler 7 on this side.

The mode transmission 5 includes a mode switching lever 17 between the input shaft 24 and the intermediate shafts 25 and 26.
As a result, the mode switching clutch 33 operated on the intermediate shaft 25 is moved to the lock claw 34 integrated with the transmission case 23.
And a driving claw 35 integral with the intermediate shaft 25 so that the locking claw 34 can be disengaged and detached from the locking shaft 34 from the intermediate position.
, The mode switching clutch 33 is not rotated and the brake mode is set, and when the drive claw 35 is engaged, the differential mode is set.

On the input shaft 24, the transmission differential lever 18 is provided.
The transmission differential gear 36 is switched to the gear 37 on the intermediate shaft 26 in a state of being constantly engaged with the gear portion of the mode switching clutch 33 to perform high-speed and low-speed transmission. The rotation of the intermediate shaft 26 is interlocked with the rotation of the intermediate shaft 25 through a rotatable reverse gear 38. When the speed of the gear 37 is switched to low speed by switching the differential gear 36, the low speed differential mode is set. When the speed is changed to high speed, the double speed differential mode is set. When the gear 37 is switched to the position via the reverse gear 38, the spin mode is set.

The intermediate shaft 26 meshes with the clutch gears 40 of the left and right mode clutches 6 via the gear 39, and the steering clutch gear 3 can be interlocked by the mode clutch 6. The left and right mode clutches 6 are configured as frictional multi-plate clutches which are turned on and off by the movement of the steering clutch gear 3 operated by the shifter 31, and can be turned on when the steering clutch 3 is turned off. , At the engagement position of the steering clutch 3.
When the mode clutch 6 is engaged, the rotation of the clutch gear 40 linked with the intermediate shaft 26 by the switching of the transmission differential gear 36 is linked with the steering clutch gear 3 on the steering clutch disengagement side, and the respective modes are switched. That is, transmission can be performed by switching between the low-speed differential mode, the double-speed differential mode, and the spin mode. At this time, the mode switching clutch 33
Is in a differential mode position and is in a position where it engages with the drive pawl 35, but when the speed is shifted by the sub-transmission gear 27, the drive pawl 35 rotated through the intermediate shaft 25, the mode switching clutch 33 The rotation of the clat gear 40, which is interlocked via the transmission differential gear 36, the intermediate shaft 26, etc., is also transmitted and transmitted to the sprocket shaft 20 in each differential mode.

As described above, when the differential mode is switched by operating the transmission differential lever 18, the mode switching clutch 33 is in the differential mode in which the mode switching lever 17 is engaged with the driving claw 35. However, when the steering is simply performed by disengaging the steering clutch gear 3 as described above, the steering mode is set to the neutral position in which the mode switching lever 17 does not engage with either the driving claw 35 or the lock claw 34. .

When the mode switching lever 17 is set to the brake mode and the mode switching clutch 33 is engaged with the lock claw 34, the mode switching clutch 33 which always meshes with the transmission differential gear 36 rotates even if the intermediate shaft 25 rotates. Not
Since the clutch gear 40 passing through the transmission differential gear 36 is in a fixed state, when either the left or right steering clutch gear 3 is turned off by the power steering lever 14 and the mode clutch 6 is engaged, the steering clutch gear 3 By applying a brake to the rotation of the vehicle, a pivot turn can be performed by the steering brake.

In each of such steering and turning modes,
The transmission of the outer crawler 7 is braked and fixed based on the traveling speed selected by the main transmission 1 and the auxiliary transmission 2 (FIG. 2-C:
(Brake mode), reverse rotation (FIG. 2-D: spin mode), deceleration rotation (FIG. 2-B: low-speed differential mode), and speed-up rotation (FIG. 2-A: double-speed differential) mode). Accordingly, in the double speed differential mode, the steering clutch gear 3 on the steering side is transmitted at a high speed.
The direction change switch 41 is operated by operating the speed change differential lever 18 so that the operation interlock is reversed so that the rotation of the steering clutch gear 3 on the side opposite to the side on which the power steering lever 14 is tilted becomes a high-speed rotation. It is turned on to perform the operation by reversing the output from the controller to the push cylinder 30.

The hydraulic circuit in which the steering clutch gear 3 is operated by the power steering lever 14 is, as shown in FIG. 4, a steering switch which is switched by a solenoid to a hydraulic circuit 43 communicating from the hydraulic pump P to the left and right push cylinders 30. Valve 4
The steering switching valve 42 is switched so that the steering clutch gear 3 on the steering side is disengaged by the left and right inclination of the power steering lever 14, and the push cylinder 30 is operated. The shifter 31 is operated by the pressure. At this time, the power steering valve 45 provided in the power steering circuit 44 on the tank port T side of the push cylinder 30 is throttled by the inclination of the power steering lever 14 to a certain degree or more, so that the operation amount of the push cylinder 30 on the opposite side is increased. Thus, the mode clutch 6 can be activated.

Regarding the inversion in the controller,
In the case of the switch circuit shown in FIG.
The solenoid output circuit 0 includes a power steering switch 46 that is switched by a steering operation of the power steering lever 14 and a direction switch 41 that is switched by the shift differential lever 18.
In the spin mode, the brake mode, and the low-speed differential mode, it is at the normal position E shown by a solid line, but in the double-speed differential mode, it is switched to the reverse position F shown by a virtual line. Therefore, the operation in the double speed differential mode is eliminated.

The HST lever 15 has a push button switch 4
7 and by turning on this switch 47,
The unload valves 48 and 49 on the tank port T side in the hydraulic circuit 43 and the power steering circuit 44 are closed and switched to a throttle or the like, and the hydraulic pressure of the left and right push cylinders 30 is increased.
To enter. As a result, for example, when the switch 47 is pressed during straight traveling, the vehicle reverses at a constant speed in the spin mode, the stop brake is effective in the brake mode, and the speed is constant at any speed in the low-speed differential mode, In the double-speed differential mode, the traveling speed is extremely high, exceeding the maximum speed of the hydraulic continuously variable transmission HST, regardless of the traveling speed.

[Brief description of the drawings]

FIG. 1 is a front view showing a transmission mechanism of a transmission case section.

FIG. 2 is a plan view showing driving speeds of right and left crawlers.

FIG. 3 is an overall side view of the combine.

FIG. 4 is a hydraulic circuit diagram of a steering operation.

FIG. 5 is an operation electric circuit diagram of a part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main transmission 2 Sub transmission 3 Steering clutch gear 4 Steering clutch shaft 5 Transmission 6 Mode clutch

Claims (1)

(57) [Claims] 1. A steering system comprising a main transmission 1 and an auxiliary transmission 2.
Left and right independent steering clutch 3 on clutch shaft 4
In the power vehicle, the main transmission 1 and the auxiliary transmission 2
To transmit the rotational power shifted by the steering to the steering clutch shaft 4.
And the traveling mode of the traveling device inside the turn
Alternative to pivot turn, differential turn and spin turn
Switching means is provided, and the differential turn mode
Powered vehicle characterized in that it can be changed to several stages
Running transmission .