JPH0774012B2 - Steering control device for combine harvester - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering control device for a combine equipped with a crawler type traveling device, and more specifically, to a driving mode of the traveling device on the inside of a turn during steering operation. The present invention relates to a technique for configuring various changes.

[Conventional technology]

Conventionally, as a steering control device of this type of combine, for example, as shown in Japanese Utility Model Publication No. 62-187324,
There is a type in which it is possible to set a one-sided drive turn (clutch turn) by cutting off the transmission of the driving force to the crawler traveling device on the inside of the turn during steering operation, or a brake turn (brake turn) in a braking state. .

[Problems to be Solved by the Invention]

In harvesting work of combine harvesters, the ratio of the time during which the direction is changed without cutting is often compared to the time when the rice and wheat are actually cut, and in that direction, there is a switchback turn due to the repetition of forward and marching. Most are. It also has the characteristic that the road surface conditions are diverse, from wet field harvesting to dry field harvesting.

In contrast to the above characteristics, in the conventional clutch / brake turn, the crawler slips and the turning radius becomes large depending on the soil quality of the field, which makes the alignment operation difficult.
The lugs scrape the soil due to the slippage of the crawler that is locked and stopped by braking, which may make the field rough and make the harvesting work difficult. In addition, since the crawler on the inside of the turn has no driving force, only the crawler on the outside of the turn, which is the drive side, slips, and there is a problem that the turnability in wetland soil is poor.
There was room for improvement in that it was difficult to fully meet the characteristics of combine harvesting work described above.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new steering control device which solves the above-mentioned problems and can sufficiently cope with the characteristics of combine harvesting work.

[Means for Solving the Problems]

In order to achieve the above object, the present invention includes a crawler type traveling device configured to intermittently increase or decrease transmitted power to a pair of left and right drive wheels to steer the airframe, and to provide left and right drive wheels. A forward rotation reduction mechanism that reduces the transmitted power to the crawler type traveling device inside the turning without deteriorating the rotation direction, and a crawler type traveling device inside the turning by converting the transmitted power to the reverse direction. In addition to being provided in the reverse rotation transmission mechanism transmission which is transmitted to the vehicle, a switching means capable of selectively switching between the forward rotation reduction mechanism and the reverse rotation transmission mechanism is provided.

Further, the forward rotation reduction mechanism is configured to transmit the power from the first shaft to the second shaft in the forward rotation state via the endless rotation band and the clutch, and the power from the first shaft is transmitted. The reverse rotation transmission mechanism is configured by a transmission system that transmits to the second shaft in a reverse rotation state via a gear transmission mechanism and a clutch, and power from the second shaft is independently provided to the left and right crawler type traveling devices. It would be convenient to have a steering clutch to transmit.

[Action]

According to the characteristic configuration 1, when the forward rotation reduction mechanism is selected and the crawler type traveling device on the inside of the turn is decelerated, the crawler on the inside of the turn is performed regardless of whether the place of travel is a paved road or a muddy field. Since the traveling device can be forcibly driven at a constant speed, for example, in a general field, the rug marks of the crawler type traveling device can be left, and the lag can scrape the soil like a clutch / brake turn to damage the field. Less. Since there are no slips in wetlands, it is difficult to damage the field, and it is possible to turn with a single turning back, and like a clutch / brake turn, slipping during forward / backward damages the field, and turning back and forth many times. The inconvenience of turning around is eliminated.

Then, when the reverse rotation transmission mechanism is selected and the crawler type traveling device on the inside of the turn is driven in the reverse direction, the in-situ turn (the super turning turn) in which the turning radius is theoretically zero can be performed. Therefore,
For example, in a dry field, it is difficult to align the aircraft to the next line to be mowed by repeating forward / backward with conventional clutch / brake turns, that is, it is difficult to align the line. Although a large space is required for the turning, the work efficiency is deteriorated, but the small-turn turning by the reverse rotation drive facilitates the alignment and the work loss can be reduced.

Therefore, in order to realize the above-mentioned characteristic configuration in the conventional technical category, the structure such as the adoption of a transmission system including a hydraulic motor (hydrostatic type continuously variable transmission) for each of the left and right traveling devices is required. There is a problem that it becomes complicated and costly,
There is room for further improvement.

Therefore, according to the characteristic configuration 2, as shown in FIG. 1, the clutch (23) for transmitting the power from the endless rotation band (21) is set to the transmission state, and the transmission from the second shaft (16) is performed. By operating the steering clutch (C) so as to transmit the power to one crawler traveling device (1), the crawler (1) is decelerated and the clutch for transmitting the power from the gear transmission mechanism (22). (24) is set to the transmission state, and the power from the clutch (24) is applied to one of the crawlers (1) as described above.
By operating the steering clutch (C),
The crawler (1) is driven in reverse.

That is, the forward rotation reduction mechanism (D) and the reverse rotation transmission mechanism (E) which select the power of the first shaft (15) between the normal rotation state and the reverse rotation state and transmit it to the second shaft (16) are rotated endlessly. Movement zone (21),
The gear transmission mechanism (22) and the two clutches (23) and (24) can be provided by a relatively simple structure and inexpensive means, and the transmission ratio of the endless rotation band (21) and the gear transmission mechanism. By appropriately setting the transmission ratio of (22) in advance, it is possible to decelerate the crawler traveling device (1) on the inside of the turn.

〔The invention's effect〕

As described in claim 1, by incorporating a forward rotation reduction mechanism and a reverse rotation mechanism in a single mission, and making them selectively usable according to field conditions, it is possible to cope with the characteristics of the combine harvesting work described above. It is possible to realize a combine that has a variety of work efficiency, does not roughen the field, and is easy to turn. In the combine described in the claim 2, the mission that can realize the above effect, the axis,
It has an advantage that it can be achieved by a reasonably and economically intended object, which can be obtained by means of a relatively simple structure and an inexpensive means by adding an endless rotation band such as a chain and a gear transmission system.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 8, a threshing device (3) is mounted on a vehicle body (2) equipped with a pair of left and right crawler type traveling devices (1), (1), and the front end of the vehicle body (2) is mowed. A pretreatment unit (4) is connected so as to be able to move up and down, and further, a driving unit (A) is formed at the front portion of the vehicle body located on the right side of the cutting pretreatment unit (4). It is configured.

As shown in the figure, the travel device position is
a), a large number of idle wheels (1b) and a crawler belt (1c), and the drive sprocket (1a) is transmitted to transmit power from a mission (M) arranged in the left and right center of the vehicle body. The system is formed.

As shown in FIG. 1, an input shaft (7) to which power from an engine (not shown) is transmitted to a transmission case (5) of a mission (M) via an input pulley (6), and this input shaft ( The power from the output gear (8) externally fitted to 7) is transmitted via the shift gear (9) externally fitted to the shaft, and the power from the shifter shaft (10) and the shift gear (9) of the shifter shaft (10). , An intermediate shaft (12) transmitted to any of the three gears (11) fitted onto the shaft, the power from the intermediate shaft (12) is transmitted to each of the input gears (G ₁ ),
First and second externally fitted transmission clutches (B ₁ ), (B ₂ ), (B ₃ ), (Bb) having (G ₂ ), (G ₃ ), (Gb)
Each of the transmission shafts (13) and (14) is provided, and these shafts constitute a main transmission system.

The transmission (M) includes a forward rotation speed reduction mechanism (D) that decelerates and transmits the rotational power from the main transmission system without changing the rotation direction thereof, and a reverse rotation transmission mechanism that transmits the rotational power by converting the rotational direction to the reverse direction. (E) is incorporated, and a hydraulic brake (29) capable of exerting a braking force is provided on one of the left and right crawler traveling devices (1), (1). Then, it is transmitted to one of the left and right crawler traveling devices (1), (1) in either the forward rotation deceleration state or the reverse rotation transmission state.
Alternatively, one of the forward rotation reduction mechanism (D), the reverse rotation transmission mechanism (E), and the hydraulic brake (29) is selectively selected and switched so that the braking force is applied to one of the crawler traveling devices. A travel control device provided with a possible switching means (42) is provided.

That is, the traveling control device includes the first shaft (15), the second shaft (16), the steering clutch shaft (17), and the first shaft (15), which are sequentially arranged from the central position of the transmission case (5) downward. 1st and 2nd
The output gear (13) provided on each of the speed change shafts (13) and (14)
First shaft (15) so that power from a) and (14a) can be transmitted
The input gear (18), the first shaft (15) and the second shaft (1
6) and a sprocket (19), (20) provided on the first shaft (15) and the second shaft (16), a transmission system formed by winding an endless rotation band (21) made of a chain Sprocket (19),
A gear having (22) a gearbox (22a) and (22b) provided on a first shaft (15) and a second shaft (16), which is a transmission system formed by winding an endless rotation band (21) made of a chain around (20). A transmission system including a transmission mechanism (22), hydraulic clutches (23) and (24) interposed in each of these two transmission systems, and a steering clutch shaft (17) which is idle supported in the center of the first shaft ( The clutch gear (25) that meshes with the input gear (18) of (15), the clutch sleeves (26), (26), which are externally fitted to the steering clutch shaft (17) at the left and right positions of the clutch gear (25), Two sets of gear interlocking parts (27), (27), clutch sleeves (26), which transmit the power from the two shafts (16) to the outer positions of the respective clutch sleeves (26), (26),
Shift fork (28), (28), second for operating (26)
Each of the hydraulic brakes (29) is configured to apply a braking force to the shaft (16).

Further, at the lower end of the transmission case (5), the drive sprockets (1a) and (1a) of the crawler traveling devices (1) and (1), respectively.
The drive shafts (30), (30) connected to the drive shafts (30), (30) are supported, and the gears of the clutch sleeves (26), (26) are engaged with the inner ends of the drive shafts (30), (30). (31),
(31) is provided.

When a steering operation is performed, one of the two hydraulic clutches (23) and (24) or the hydraulic brake (29) is selected by operating a hydraulic system described later, and the left and right shift forks ( By operating one of 28) and (28), the clutch sleeve (26), like the one shown on the left side in FIG. 1, passes through the gear interlocking part (27) to the second shaft (16). The power of the deceleration state, the power of the reverse rotation state, or the braking force acts on the crawler traveling device (1) on this side. .

The clutch gear (25), clutch sleeve (26),
(26), the gear interlocking parts (27), (27) are collectively referred to as steering clutches (C), (C), and, as described above, the input shaft (7) is passed through the input pulley (6). The power transmitted to the hydraulic pump (32) drives the two shafts (33),
The output pulley (35) for transmitting power to the pre-cutting processing section (4) is driven via the (34), and the four speed change clutches (B ₁ ), (B ₂ ), (B ₃ ). , (Bb) shifts forward 3rd speed and reverse 1st speed, and the first shift shaft (13) is provided with a mechanical parking brake (36).

As shown in FIG. 2, the transmission system inside the transmission case (5) is designed to reduce the size in the vertical direction by the overlapping arrangement of gears in the front-rear direction, and as shown in FIG. As described above, in order to easily assemble the travel control device, openings are formed on the left and right side portions of the transmission case (5), and lids (5a), (5a) for closing the openings are provided. .

As shown in FIG. 3, the operation arms (37) and (37) are provided at the outer ends of the transmission cases (5) of the operation shafts (28a) and (28a) of the shift forks (28) and (28), respectively. A case (39) containing pistons (38), (38) for mounting and operating these operating arms (37), (37) is mounted on the front surface of the transmission case (5). (38), (3
8) and the four shifting clutches (B ₁ ), (B ₂ ), (B
₃ ), (Bb), two hydraulic clutches (23), (24), and a system for controlling the hydraulic brake (29) are shown in FIG.

That is, the hydraulic fluid from the hydraulic pump (32) passes through the shift control valve (40) and shift clutches (B ₁ ), (B ₂ ),
(B ₃ ), (Bb), and similarly, is also supplied to the pistons (38), (38) via the steering control valve (41), and (38), (38). A cylinder (38a) for storing
The hydraulic oil from (38a) is passed through the steering mode switching valve (corresponding to switching means) (42) to the two hydraulic clutches (23) and (2).
4) and hydraulic brake (29).

The shift control valve (40) is formed on the side of the transmission case (5), and the steering control valve (41) is a rotary type case (39).
The steering mode switching valve (42) is provided in each of the
The gearshift control valve (40) is associated with the gearshift lever (43) provided in the driving section (A), and is operated by operating the steering lever (44) provided in the driving section (A) left and right. The control valve (41) is operated to operate the steering mode switching valve (42) by a shift operation along the lever axis of the steering lever (44).

The steering control valve (41) has a circular arc shape, which is a first annular groove (45) to which the pressure oil from the hydraulic pump (32) is supplied to the valve body (41a) shown in FIGS. The two arcuate grooves (46), (46) formed, the second annular groove (47) formed in a bent state at a position sandwiched by these arcuate grooves (46), (46), and an oil drain groove The third annular groove (4 formed so as to communicate with (48)
9) Each has its outer surface and has two arcuate grooves (4
6) and (46) communicate with the first annular groove (45) through the oil passage hole (50).

The second annular groove (47) and the oil drain groove (48) at the operating position shown in FIG. 6 communicate with the oil drainage system through the oil passage hole (51) to rotate the valve body (41a). Two arcuate grooves (46),
The oil passage (51), so that the pressure oil from one of the (46) is supplied to one of the cylinder parts (38a), (38a).
(52) is formed, and the oil passage (53) drawn out from the wall portions of the cylinder portions (38a), (38a) is supplied to the steering mode switching valve (42) as described above, and this oil passage ( An oil passage (54) branched from 53) communicates with the third annular groove (49).

During the steering operation, one of the pistons (38) is operated by the turning operation of the valve body (41a), and then the valve body (41a) is further turned to flow out from the oil drain groove (48). As a result of the gradual suppression of the amount of hydraulic oil, the hydraulic pressure for the two hydraulic clutches (23), (24) or hydraulic brake (29) is gradually increased to enable smooth steering operation. Is there.

As shown in FIG. 1, even if the pistons (38), (38) move to the stroke end, the clutch sleeve (26),
The operation stroke of (26) is set so that it does not come into contact with bearings located outside.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a steering control device for a work vehicle according to the present invention. FIG. 1 is a sectional view of a transmission case, FIG. 2 is a side view showing a transmission system in the transmission case, and FIG. Fig. 4 is a front view showing an operating system, Fig. 4 is a hydraulic circuit diagram, Fig. 5 is a schematic view showing an oil passage for a piston, Fig. 6 is a side view showing a steering control valve, and Fig. 7 is a drainage groove. FIG. 8 is a sectional view showing the front part of the combine. (1) …… Crawler type traveling device, (1a) …… Drive wheel,
(15) …… 1st axis, (16) …… second axis, (21) …… endless rotation band, (22) …… gear transmission mechanism, (23) …… clutch, (24) …… clutch , (42) …… Switching means, (C)
…… Running clutch, (D) …… Forward rotation deceleration mechanism, (E)…
… Reverse transmission mechanism.

Claims (2)

[Claims] 1. A crawler-type traveling device (1) configured to intermittently increase or decrease transmitted power to a pair of left and right drive wheels (1a), (1a) for steering the airframe, and A forward rotation reduction mechanism (D) that reduces the transmitted power to the left and right drive wheels (1a), (1a) without changing the rotation direction and transmits the reduced power to the crawler type traveling device (1) inside the turning, and the transmitted power. The transmission (M) is provided with a reverse rotation transmission mechanism (E) for converting the rotation direction thereof to the reverse direction and transmitting the rotation to the crawler type traveling device (1) on the inside of the turn, and the forward rotation reduction mechanism (D) and the A steering control device for a combine, comprising switching means (42) capable of selectively switching between the reverse rotation transmission mechanism (E). 2. The normal rotation is transmitted by a transmission system that transmits the power from the first shaft (15) to the second shaft (16) in the normal rotation state via the endless rotation band (21) and the clutch (23). Reduction mechanism (D)
In addition, the power from the first shaft (15) is transmitted to the second side in the reverse rotation state via the gear transmission mechanism (22) and the clutch (24).
The reverse rotation transmission mechanisms (E) are respectively constituted by transmission systems transmitting to the shaft (16), and power from the second shaft (16) is transferred to the left and right crawler type traveling devices (1),
A steering clutch (C) that independently transmits to (1),
The steering control device for a combine according to claim 1, further comprising (C).