JPH1149024A - Turn device for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve turning performance. SOLUTION: In a work machine interposing a belt type continuously variable transmission 8 and a forward/backward moving switching mechanism 9 in a condition connected in series in a transmission system from an engine 7 to a right/left running device 1R, 1L, in a final transmission shaft 12 of the transmission system, respective axle 13R, 13L of the running device 1R, 1L is interlocked through planet gear mechanisms 14R, 14L, a turning continuously variable transmission 15 able to be forward/reverse switched is provided, which changes a rotational speed of the axle 13R, 13L by respectively rotating rotary elements R, L without being used in input/output of the rotary element constituting these planet gear mechanisms 14R, 14L. An interlocking means is provided, which actuates the turning continuously variable transmission 15 so as to rotate the rotary element R or L corresponding to a turn inside of the running device 1R, 1L in an axle rotational speed decrease direction interlocked with turn operation of a turn appliance 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine or the like in which a belt type continuously variable transmission and a forward / reverse switching mechanism are interposed in a transmission system from an engine to left and right traveling devices in a state of being connected in series. Related to a turning device for a working machine.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 9-99854, a shifter interlocking with each of left and right axles is rotatable on the final transmission shaft of the transmission system, and is connected to the transmission shaft via a clutch. By turning freely, it is possible to shift between the interlocked clutch engagement position, the clutch disengagement position where the interlock with the transmission shaft is released, and the braking position where the brake is operated and the brake is applied by the brake in the clutch disengaged state. Was composed. That is, it is configured to perform gentle turning by cutting off the transmission to the axle inside the turning, and to perform pivot turning by braking the axle inside the turning.

[0003]

However, according to the above-mentioned prior art, although a gentle turn and a pivot turn can be performed,
The gentle turning is performed by cutting off the transmission to the traveling device inside the turning, and the traveling device inside the turning rotates while being dragged. It was difficult to make a turn along.

An object of the present invention is to improve turning performance.

[0005]

The features, functions and effects of the first aspect of the present invention are as follows.

[Features] In a working machine in which a belt-type continuously variable transmission and a forward / reverse switching mechanism are interposed in a transmission system from the engine to the left and right traveling devices in series, the transmission system The final transmission shaft is linked with each of the axles of the traveling device via a planetary gear mechanism, and by rotating each of the rotating elements that are not used for input / output among the rotating elements constituting the planetary gear mechanism, the rotational speed of the axle is increased. A continuously variable transmission for turning that can be switched between forward and reverse is provided, and the rotating element corresponding to the inner one of the traveling devices rotates in the axle rotational speed decreasing direction in conjunction with the turning operation of the turning operation tool. In this way, the interlock means for operating the continuously variable transmission for turning is provided.

According to the first aspect of the present invention, the rotational speed of the rotating element of the planetary gear unit is changed by the continuously variable transmission for turning so that the rotational speed of the axle inside the turning is continuously reduced to zero. The turning radius at the time of gentle turning can be selected steplessly,
The pivot turn can be performed with the traveling device inside the turn stopped.

In addition, by further changing the rotation speed of the rotating element for reducing the rotation speed of the axle to zero, the speed of the axle can be increased in the reverse rotation, so that the traveling device inside the turning is opposite to the traveling device outside the turning. It is possible to make a super-revolution while driving in the direction.

[Effects] Therefore, according to the first aspect of the present invention, the turning performance can be freely selected, and not only the gentle turning and the base turning but also the super turning can be performed. Can be improved.

According to the second aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention,
The continuously variable transmission for turning is a hydrostatic type,
It is driven by a transmission belt wound around an output pulley of the engine and an input pulley of a belt-type continuously variable transmission.

[Operation] According to the second aspect of the present invention, the hydrostatic stepless transmission is driven by the transmission belt that transmits the engine power to the belt-type stepless transmission. A special transmission mechanism for driving the motor is unnecessary.

[Effects] Therefore, according to the second aspect of the present invention, it is possible to drive the continuously variable transmission for turning with a simple structure and at low cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a combine, which is an example of a working machine, has a planted grain culm in front of a self-propelled body 2 having a pair of left and right traveling devices 1L, 1R of a crawler type. Section 3 that cuts and transports rearwardly is movably connected to the self-propelled body 2 with a threshing device 4 for threshing the harvested culm from the cutting section 3 and a tank 5 for storing thresh grains. An operation unit 6 is mounted.

As shown in FIG. 2, the transmission system from the engine 7 of the self-propelled body 2 to the left and right traveling devices 1L and 1R includes a belt-type continuously variable transmission 8, a forward / reverse switching mechanism 9, The transmission 10 is interposed in a state of being connected in series in the order described.

The forward / reverse switching mechanism 9 transmits the output of the continuously variable transmission 8 to the auxiliary transmission 10 as forward power by operating only the forward clutch 9F using a hydraulic clutch in opposition to the urging. Similarly, the output of the continuously variable transmission 8 is transmitted to the auxiliary transmission 10 as the reverse power by making only the reverse clutch 9R using the hydraulic clutch be engaged against the urging, and the forward clutch 9F and the reverse clutch 9R are transmitted. By turning off both, a neutral state in which power is not transmitted appears. That is, the forward / reverse switching mechanism 9 also serves as a traveling clutch, and the forward clutch 9F is engaged by operating the shift lever 11 of the continuously variable transmission 8 into the forward movement range, and the neutral position of the shift lever 11 is maintained. The reverse clutch 9 </ b> R is engaged by operating the shift lever 11 in the reverse range, and the reverse lever 9 </ b> R is operated.
The cutting operation is performed by the operation to the neutral position.

The auxiliary transmission 10 is of a gear type in which the power transmitted through the forward / reverse switching mechanism 9 is switched between three levels and transmitted to the final transmission shaft 12.

The turning device for turning the self-propelled body 2 by giving a difference to the running speeds of the left and right traveling devices 1 is provided on the final transmission shaft 12 with the axles 13L, 13R of the left and right traveling devices 1L, 1R.
13R are provided with left and right planetary gear units 14L and 14R for interlocking with each other.
A reversible continuously variable transmission device 15 for reversing forward / reverse switching for operating the 14R is provided, and the continuously variable transmission device 15 is rotated based on a turning operation of a turning lever 16 which is an example of a turning operation tool that can swing right and left. It is provided with interlocking means for operating.

Each of the planetary gear units 14L, 14R is attached to the final transmission shaft 12 so as to rotate integrally with the internal gear 17L, 17R, and is attached to each of the axles 13L, 13R so as to rotate integrally therewith. Planet gears 18L, 1 meshing with internal gears 17L, 17R
Planetary frames 19L, 19R supporting 8R, and axles 13L,
13R is rotatably attached to each of the planetary gears 18L and 18R and meshes with the planetary gears 18L and 18R.
L, 20R. The internal gear 17
L, 17R, planetary frames 19L, 19R, sun gear 20L,
Reference numeral 20R denotes a rotating element constituting the planetary gear units 14L and 14R, of which the sun gears 20L and 20R are rotating elements L and R not used for input and output. Then, by increasing the number of rotations in the same direction as the final transmission shaft 12 from the stopped state of the sun gears 20L, 20R, the axles 13L, 13R
The rotation speed of the axles 13L and 13R is reduced to zero and reduced to zero by increasing the rotation speed of the sun gears 20L and 20R from the stopped state and increasing the rotation speed in the direction opposite to the final transmission shaft 12. Later, the rotational speed in the reverse direction is increased.

The turning continuously variable transmission 15 is composed of an axial plunger type variable displacement type hydraulic pump driven by the engine 7 and an axial plunger type hydraulic motor respectively driven by pressure oil. This is a hydrostatic continuously variable transmission, which is interlocked with the sun gears 20L and 20R so as to rotate the sun gears 20L and 20R at equal speeds in opposite directions by operating the sun gears 20L and 20R. , 20R in the stopped state and the forward rotation speed-up operation, the forward rotation state increases the number of revolutions of the left sun gear 20L in the same direction as the final transmission shaft 12 and the right sun gear 20R While increasing the rotation speed in the direction opposite to the transmission shaft 12, the rotation speed of the left sun gear 20 </ b> L in the reverse direction with respect to the final transmission shaft 12 in the reverse state is increased. Right sun gears with increasing 2
The number of rotations in the same direction as the final transmission shaft 12 of 0R is increased,
By performing the reverse rotation acceleration operation, in the forward state, the rotation speed of the left sun gear 20L in the direction opposite to the final transmission shaft 12 is increased, and the rotation of the right sun gear 20R is rotated in the same direction as the final transmission shaft 12. On the other hand, in the reverse state, the number of rotations of the left sun gear 20L in the same direction as the final transmission shaft 12 is increased, and the number of rotations of the right sun gear 20R in the direction opposite to the final transmission shaft 12 is increased. It is to let. The means for driving the continuously variable transmission 15 for turning is, as shown in FIG.
A means for driving by a transmission belt 21 wound around A and an input pulley 8A of a belt-type continuously variable transmission 8 for traveling speed change.

The interlocking means turns in association with the turning operation of the turning lever 16 such that the sun gear 20L or 20R corresponding to one of the traveling devices 1L and 1R inside the turning turns in the axle rotation decreasing direction. For operating the continuously variable transmission 15 for use in the vehicle. Specifically, as shown in FIGS. 3 and 4, the transmission trunnion shaft 22 of the turning continuously variable transmission 15 is pulled in one direction by operating a lever 23 that rotates the transmission trunnion shaft 22. By rotating the transmission trunnion shaft 22 from the neutral position to the reverse rotation acceleration side by rotating and pushing the transmission trunnion shaft 22 from the neutral position to the forward rotation increasing side, the transmission trunnion shaft 22 is pulled by being pulled in one direction. Is rotated from the neutral position to the reverse rotation speed-up side and pushed to rotate the transmission trunnion shaft 22 from the neutral position to the forward rotation speed-up side.
The lever 23 is provided so as to be freely swingable and can be freely switched between a first operation posture in which the lever 23 is brought into a first posture by swinging around the axis P and a second operation posture in which the lever 23 is brought into a second posture. An operation lever 25 is provided, and the operation lever 25 is switched to the second operation posture in accordance with the operation of the transmission lever 11 to the forward movement region, and the operation lever 25 is switched to the first operation posture in accordance with the operation of the transmission lever 11 to the backward movement region. A switching wire W is provided to pull the lever 23 in accordance with the turning operation of the turning lever 16 to the left in the state where the lever 23 is in the second posture, and to perform the turning operation of the turning lever 16 to the right. As a result, the turning lever 1 in a state in which the lever 23 is in the first posture while the lever 23 is being pushed.
6 is provided with a push-pull wire 24 for pulling the lever 23 in accordance with the "left" turning operation and pushing the lever 23 in accordance with the "right" turning operation of the turning lever 16. The operation lever 25 acts on the push-pull wire 24 to switch the lever 23.

The continuously variable transmission 8 for traveling speed change and the continuously variable transmission 15 for turning are mounted on a transmission case 26 having axles 13L and 13R, and a forward / reverse switching mechanism 9 and a planetary gear unit are provided. 14L and 14R are housed in the transmission case 26. Also, 27
This is a mowing unit drive shaft that is linked to the output shaft of the continuously variable transmission 8 for traveling via a gear pair 28 and a clutch 29.

According to the above configuration, if the turning lever 16 is operated to the "straight forward" position in both forward and backward travels, the continuously variable transmission 15 for turning is in the neutral state and the left and right When the sun gears 20L, 20R in the gear units 14L, 14R are in a stopped state, the left and right axles 1
3L and 13R are planetary gear units 14
The right and left traveling devices 1L and 1R are driven at the same speed in the same direction by being driven at the same speed in the same direction via the left and right wheels L and 14R, and a straight traveling state appears.

When the turning lever 16 is turned leftward in the forward straight traveling state, the shift trunnion shaft 22 rotates in the reverse direction because the lever 23 is in the second position by operating the shift lever 11 to the forward movement region. By performing the speed-up operation, the rotation speed of the left sun gear 20L in the direction opposite to the final transmission shaft 12 increases, and the forward speed of the left axle 13L, that is, the left traveling device 1L decreases, Right sun gear 20
As the number of rotations of the R in the same direction as the final transmission shaft 12 increases and the forward speed of the right axle 13R, that is, the right traveling device 1R increases, a gentle turning with the left turning inside is performed, and When the turning lever 16 is turned to the left, the forward traveling of the left traveling device 1L is stopped to perform the pivot turn. When the turning lever is further turned to the left, the left traveling device 1L is turned.
When L moves backward, a pivot turn is performed.

When the turning lever 16 is turned to the right in the forward straight traveling state, the shift trunnion shaft 22 is moved forward because the lever 23 is in the second position by operating the shift lever 11 to the forward range. By performing the speed increase operation, the rotation speed of the right sun gear 20R in the direction opposite to the final transmission shaft 12 increases, and the forward speed of the right axle 13R, that is, the right traveling device 1R decreases. , Left sun gear 20
As the number of rotations of L in the same direction as the final transmission shaft 12 increases and the forward speed of the left axle 13L, that is, the left traveling device 1L, increases, a gentle turning with the right turning inside is performed. When the turning lever 16 is turned to the right, the forward traveling of the right traveling device 1R is stopped to perform the pivot turn. When the turning lever is further turned to the right, the right traveling device 1R is turned.
When R moves backward, a pivot turn is performed.

On the other hand, when the turning lever 16 is turned to the "left" in the backward straight traveling state, the shift trunnion shaft 22 is turned forward because the lever 23 is in the first position by operating the shift lever 11 in the reverse direction. By performing the speed increase operation, the rotation speed of the left sun gear 20L in the direction opposite to the final transmission shaft 12 increases, and the left axle 13L, that is, the reverse traveling speed of the left traveling device 1L decreases. , Right sun gear 20
By increasing the number of rotations of R in the same direction as the final transmission shaft 12 and increasing the reversing speed of the right axle 13R, that is, the right traveling device 1R, a gentle turning with the left turning inside is performed. When the turning lever 16 is turned to the left, the forward traveling of the left traveling device 1L is stopped to perform the pivot turn. When the turning lever is further turned to the left, the left traveling device 1L is turned.
When L moves forward, a pivot turn is performed.

When the turning lever 16 is turned to the right in the reverse straight traveling state, the shift trunnion shaft 22 rotates in the reverse direction since the lever 23 is in the first position by operating the shift lever 11 in the reverse direction. By performing the speed-up operation, the rotation speed of the right sun gear 20R in the direction opposite to the final transmission shaft 12 increases and the right axle 13R, that is, the reverse traveling speed of the right traveling device 1R decreases, Left sun gear 20
As the number of rotations of L in the same direction as the final transmission shaft 12 increases, the left axle 13L, that is, the reverse traveling speed of the left traveling device 1L increases, so that a gentle turning with the right turning inside is performed, and When the turning lever 16 is turned to the right, the forward traveling of the right traveling device 1R is stopped to perform the pivot turn. When the turning lever is further turned to the right, the right traveling device 1R is turned.
When R moves forward, a pivot turn is performed.

[Alternative Embodiment] In the above embodiment, the sun gears 20L, 20R are used as the planetary gear units 14L, 14R.
R has been described as a rotating element not used for input / output, but as the planetary gear units 14L and 14R, the internal gear 1
7L, 17R and planetary frames 19L, 19R may be used as rotating elements not used for input / output.

In the above embodiment, the left and right traveling devices 1
Although the crawler type is shown as L and 1R, the traveling device 1L and 1R may be a multi-wheel type having three or more wheels.

In the above-described embodiment, the rotary elements L and R of the planetary gear units 14L and 14R are operated by one turning stepless transmission 15, but the two turning stepless transmissions 15 are used. May be provided to operate the rotating elements L and R separately.

The structure of the forward / reverse switching mechanism 9 can be changed as appropriate.

In the above embodiment, an example of application to a combine has been described, but any work machine may be used.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a schematic diagram of a transmission system.

FIG. 3 is a cutaway front view showing movement of a lever.

FIG. 4 is a side view showing movement of a lever.

FIG. 5 is a side view showing a drive structure of the continuously variable transmission.

[Explanation of symbols]

 1L, 1R Traveling device 7 Engine 7A Output pulley 8 Continuously variable transmission 8A Input pulley 9 Forward / reverse switching mechanism 12 Final transmission shaft 13L, 13R Axle 14L, 14R Planetary gear mechanism 15 Continuously variable transmission for turning 16 Turning operation tool 21 Transmission belt L, R Rotary element

Claims (2)

[Claims] 1. A working machine in which a belt-type continuously variable transmission and a forward / reverse switching mechanism are interposed in a transmission system from an engine to left and right traveling devices in a state of being connected in series. Each of the axles of the traveling device is linked to the final transmission shaft via a planetary gear mechanism, and among the rotating elements constituting these planetary gear mechanisms, each of the rotating elements not used for input / output is rotated to reduce the rotational speed of the axle. A continuously variable transmission for turning that can be switched between forward and reverse is provided so that the rotating element corresponding to the inside of the traveling device rotates in the direction of decreasing the axle rotation speed in conjunction with the turning operation of the turning operation tool. A turning device of a working machine, further comprising interlocking means for operating a continuously variable transmission for turning. 2. The continuously variable transmission for turning is of a hydrostatic type, and is driven by a transmission belt wound around an output pulley of the engine and an input pulley of a belt-type continuously variable transmission. The turning device for a working machine according to claim 1, wherein