JPH07187000A - Steering gear of traveling farm machinery - Google Patents

Abstract

PURPOSE:To perform a spin turn safely and smoothly, in this traveling farm machinery which travels a machine body with a travel crawler. CONSTITUTION:In a steering gear of a traveling farm machinery equipped with both symmetric side clutches 26 and 27 engaging or disengaging the drive of both symmetric travel crawlers 2 and 2, and a spin-turn clutch 38 interlocking and connecting these crawlers 2 and 2 in a state of being reversely turned with each other, it is provided with a side clutch lever 42 which heightens the duty ratio of a pulse signal for power continuing control over the spin-turn clutch 38 in proportion to a tilt angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device for a mobile agricultural machine, such as a combine, which has a pair of left and right traveling crawlers to move the machine forward and backward.

[0002]

2. Description of the Related Art Conventionally, when performing a spin turn of a combine airframe, there has been a technique of performing spin turn of the airframe by switching one traveling crawler on the turning inner diameter side from forward to reverse and reversing.

[0003]

In the above-mentioned prior art, when performing a spin turn in a gear type mission, the manufacturing cost is low, but since the turning speed is substantially constant, it is difficult for an unfamiliar worker to handle. In the case of a hydraulic continuously variable transmission, the turning speed can be arbitrarily obtained, but there are problems such as a large loss of hydraulic drive and a reduction in manufacturing cost. there were.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a left and right side clutch for connecting and disconnecting the drive of the left and right traveling crawlers,
A side clutch lever for increasing the duty ratio of a pulse signal for spin turn clutch power continuation control in proportion to the tilt angle in a steering device of a mobile agricultural machine equipped with a spin turn clutch that interlocks left and right traveling crawlers in a mutually reverse rotation state. In addition, the spin turn speed can be arbitrarily changed and the handling operability and maneuverability can be easily improved due to the inexpensive structure.

Further, in the steering apparatus of the mobile agricultural machine, which is provided with the left and right side clutches for disconnecting the drive of the left and right traveling crawlers, and the spin turn clutch for interlocking the left and right traveling crawlers in a mutually reverse rotation state, the spin turn clutch power continuation control With a side clutch lever that raises the hydraulic pressure for use in proportion to the angle of inclination, it is an inexpensive structure and the spin turn turning speed can be changed arbitrarily, improving handling operability and mobility. It can be done easily.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a steering electric circuit diagram, FIG. 2 is an overall side view of the combine, and FIG. 3 is a plan view thereof. In the figure, (1) is a track frame equipped with a traveling crawler (2), and (3) is the above-mentioned. The machine stand installed on the truck frame (1), (4) the threshing section in which the feed chain (5) is stretched on the left side, and the handling cylinder (6) and the processing cylinder (7) are built in (8) A mowing unit provided with a cutting blade, a grain culm transport mechanism, and the like, (9) is a straw chain (1
0) and a straw processing unit including a straw cutter (11),
(12) is a driver's cab provided with a driver's seat (13) and a driving operation section (14), (15) is an engine section in which an engine (16) is installed, and (17) is arranged behind the engine section (15). And a grain tank for storing the grain from the threshing unit (4) through a lifting cylinder (18), (19) is the grain tank (17)
It is an upper discharge auger that takes out the grain inside, and is configured to continuously perform cutting and threshing work.

Further, FIG. 4 shows a mission case (20).
FIG. 3 is a drive system diagram of an input pulley (21) for transmitting a driving force of an engine (16) and a hydraulic continuously variable transmission for main shift (22) for continuously outputting a rotational force of the input pulley (22). And a PTO output pulley (24) for outputting a driving force to the reaper (8) through the PTO speed change output gear mechanism (23), a traveling auxiliary speed change gear mechanism (25), and a hydraulic switching multi-plate left / right side. The clutch (26) (27) and the left and right side clutches (2
6) Left and right output shafts (28) connected via (27)
(29) and left and right output shafts (28), (29) are provided with left and right axles (30) (31) that are always connected, and the axle (30)
The traveling crawlers (2) and (2) are driven via the sprockets (32) and (32) of (31).

Further, right and left clutch shafts (33) and (34) which are always connected to the left and right output shafts (28) and (29) are coaxially provided, and the right clutch is connected to the right output shaft (29) through a reverse gear (35). The left and right clutch shafts (33) and (34) are always reversely driven by connecting the shaft (34), and the left and right clutch shafts (33) and (34) are provided with hydraulic switching multi-plate left and right brakes (36) and (37). , Left and right clutch shaft (33)
A hydraulic switching multi-plate type spin turn clutch (38) that connects the (34) in a freely connectable and disconnectable manner is provided. Either one of the left and right side clutches (26) (27) is disengaged, and the spin turn clutch (38) is engaged. At this time, the traveling crawler (2) on the inner diameter side of the turning is rotated in the opposite direction, and the spin turn operation is performed to change the direction of the machine body.

Further, FIG. 5 is a steering hydraulic circuit diagram, in which a turning electromagnetic valve (41) having left and right turning solenoids (39) (40) and a turning manual valve (43) which is switched by a side clutch lever (42). ), Left and right clutch cylinders (44) and (45) for holding and holding the left and right side clutches (26) and (27), and the valves (41) and (4).
The left and right clutch valves (46) and (47) for switching the clutch cylinders (44) and (45) to operate by switching the pilot hydraulic pressure of 3) and the left and right brake cylinders (48) and (48) for turning on the left and right brakes (36) and (37). 49), the brake cylinder (48) is provided through the valves (41) (43) with the electromagnetic valve (41) on the better side.
A circuit is formed so that the first hydraulic pump (50) is connected to (49) and the clutch cylinders (46) and (47) are switched using the operating pressure of the brake cylinders (48) and (49) as pilot hydraulic pressure. 46) (4
2) to the clutch cylinders (44) and (45) via 7)
Connect the hydraulic pump (51). The manual valve (43) is switched to operate the brake cylinders (48) (4
9) The first hydraulic pump (50) is used as a pilot hydraulic pressure for switching the clutch valves (46) and (47) while performing the on-operation and the clutch cylinder (44) (45) disengagement operation
The hydraulic pressure is applied to the clutch valves (46) (47) via the electromagnetic valve (41), and the clutch cylinders (44) (45) are disengaged by switching the electromagnetic valve (41).

Further, a spin turn electromagnetic valve (53) having a spin turn solenoid (52) is provided, and the spin turn cylinder (54) is connected to the third hydraulic pump (55) via the valve (53), Valve (53)
To activate the spin turn cylinder (54),
The spin turn clutch (3
8) is turned on and the left and right axles (30) and (31) are connected in a reverse rotation state.

Further, FIG. 1 is a steering control circuit diagram, in which a spin turn switch (57) which is turned on by a spin turn lever (56) at the upper end of the side clutch lever (42) and a pulse generation circuit (58). The spin turn solenoid (52) is turned off when the road traveling speed change mode or the traveling speed is equal to or higher than a predetermined value (the entire road traveling speed, the auxiliary gear shift is high) and is equal to or less than a predetermined value (working speed = the auxiliary gear shift is middle speed / low speed). ) To turn on the speed control switch (59) and the left and right steering switches (60) that are turned on by the side clutch lever (42) of the left and right spin turn zones that tilts at a larger angle than the brake turning zone that switches the manual valve (43). ) (61) is provided. And
When the spin turn switch (57) and speed check switch (59) are on, the side clutch lever (42)
Tilting to the left, the left brake cylinder (48) is turned on by the switching of the manual valve (43) in the brake turning zone, the left side clutch cylinder (44) is turned on, and the left brake (36) is turned on. The left side clutch (26) disengages and turns left. Further, by tilting the side clutch lever (42) further leftward, the left steering switch (60) is moved by the side clutch lever (42) tilted to the left spin turn zone.
Is turned on, the left turning solenoid (39) and the spin turn solenoid (52) are turned on, the turning electromagnetic valve (41) is switched to operate the left clutch valve (46), and the left side clutch cylinder (44) is operated. Is operated to disengage the left side clutch (26), the brake cylinder (48) is moved back, the left brake (36) is disengaged, and the spin turn solenoid (52) is turned on to turn on the spin turn electromagnetic. Switch the valve (53),
The spin turn cylinder (54) is activated and the spin turn clutch (38) is engaged, and the right side clutch (2
The rotational force of 7) is reversed and transmitted to the left traveling crawler (2), the left traveling crawler (2) on the inner diameter side of the turn is rotated in the opposite direction, and the spin turn operation is performed in the left turn direction. There is. Contrary to the above, when the side clutch lever (42) is tilted to the right, the manual valve (43) turns right and the electromagnetic valves (41) (53) turn right. Further, by interlocking with the spin-turn solenoid (52) to excite the reversing-side swing solenoid (39) or (40), a double gear accident in the transmission case (20) is prevented.

Further, as shown in FIG. 1, a duty ratio changing volume (62) for changing the duty ratio of the pulse signal output from the pulse generating circuit (58) is provided, and the volume (62) is connected to the side clutch lever (62). 42) and the side clutch lever (42)
The duty ratio of the pulse signal set by the volume (62) is increased in proportion to the tilt angle of the spin turn solenoid (52) to increase the ON time of pulse drive,
The speed of the traveling crawler (2) on the reverse rotation side is continuously changed to the high speed side, and the left and right traveling crawlers (2) and (2) are rotated at the same speed in the opposite direction at the maximum. ) A mobile agricultural machine equipped with left and right side clutches (26) and (27) for connecting and disconnecting the drive of (2) and a spin turn clutch (38) for interlocking the left and right traveling crawlers (2) and (2) in a mutually reverse rotation state. The steering apparatus is provided with a side clutch lever (42) for increasing the duty ratio of the pulse signal for power continuation control of the spin turn clutch (38) in proportion to the tilt angle, and the side clutch lever (4) is provided.
It is configured such that the speed of the reverse rotation traveling crawler (2) on the inner diameter side of the turning is arbitrarily changed by the tilting of 2) and the spin turn operation is performed at a desired speed.

Further, FIG. 6 shows a modification of the above-mentioned FIG. 5, in which a clutch valve (46) (which restricts the pilot hydraulic pressure from the electromagnetic valve (41) for turning applied to the clutch valve (46) (47). 47) A relief valve (63) for switching, and a back pressure spring (64) for the valve (63)
The side clutch lever (42) is connected to the relief valve (63) in proportion to the tilt angle of the lever (42).
Clutch valve (46) (47) which is restricted by
A relief valve (65) for spin turn for limiting the operating hydraulic pressure of the clutch valve (46) (47)
The switching oil pressure is applied as the pilot oil pressure as the back pressure of the spin turn relief valve (65), and the back pressure of the spin turn relief valve (65) is increased in proportion to the tilt angle of the side clutch lever (42), When the operating oil pressure of the spin turn cylinder (54) is changed steplessly to perform the spin turn operation by switching each electromagnetic valve (41) (53), the spin turn is proportional to the tilt angle of the side clutch lever (42). By increasing the operating oil pressure of the cylinder (54), the spin turn solenoid (5
Similar to the pulse control of 2), the speed of the traveling crawler (2) on the reverse rotation side is continuously changed to the high speed side, and the left and right side clutches that continuously disconnect the driving of the left and right traveling crawlers (2) (2). (26) (27) and the left and right traveling crawlers (2) and (2) are linked to each other in a mutually reverse rotation state. A spin turn clutch (38) is provided. A side clutch lever (42) for increasing the hydraulic pressure for control in proportion to the tilt angle is provided, and by tilting the side clutch lever (42), the reverse rotation traveling crawler (2) on the inner diameter side of the turning is provided.
The speed is changed arbitrarily, and the spin turn operation is performed at a desired speed.

Further, FIG. 7 shows a modification of the above-mentioned FIG. 1, in which a vehicle speed sensor (66) for detecting the rotational speed of the traveling crawler (2) and a speed check relay (67) based on the output of the sensor (66). ) Is provided at a speed equal to or lower than a predetermined vehicle speed, and a relay switch (69) of the relay (67) is provided in series with the spin turn solenoid (52) in the same manner as the speed check switch (59) of FIG. The actual turn speed is detected, and the spin turn solenoid (52) is excited only when the speed is equal to or lower than a predetermined speed.

[0015]

As is apparent from the above-described embodiments, the present invention provides the left and right side clutches (26) and (27) that connect and disconnect the driving of the left and right running crawlers (2) and (2), and the left and right running crawlers (2) ( In a steering device for a mobile agricultural machine including a spin turn clutch (38) for interlocking 2) in a mutually reverse rotation state, a duty ratio of a pulse signal for spin continuation (38) power continuation control is proportional to a tilt angle. Since the side clutch lever (42) to be raised is provided, the spin turn speed can be arbitrarily changed due to the inexpensive structure, and the handling operability and the maneuverability can be easily improved. .

Further, left and right side clutches (26) and (27) for connecting and disconnecting the driving of the left and right traveling crawlers (2) and (2),
In a steering apparatus of a mobile agricultural machine including a spin turn clutch (38) for interlocking left and right traveling crawlers in a mutually reverse rotation state, the hydraulic pressure for spin turn clutch (38) power continuation control is increased in proportion to the tilt angle. Since the side clutch lever (42) is provided, the structure is inexpensive and the spin turn turning speed can be arbitrarily changed, and the handling operability and maneuverability can be easily improved.

[Brief description of drawings]

FIG. 1 is a steering electric circuit diagram.

FIG. 2 is a side view of the combine.

FIG. 3 is a plan view of the combine.

FIG. 4 is an explanatory diagram showing a drive system of a mission case.

FIG. 5 is a steering hydraulic circuit diagram.

FIG. 6 is a hydraulic circuit diagram showing a modified example of FIG.

FIG. 7 is a steering electric circuit diagram showing a modification of FIG.

[Explanation of symbols]

 (2) Crawler (26) (27) Side clutch (38) Spin turn clutch (42) Side clutch lever

Claims (2)

[Claims] 1. A steering apparatus for a mobile agricultural machine, comprising: a left and right side clutch that connects and disconnects the drive of the left and right traveling crawlers; and a spin turn clutch that interlocks the left and right traveling crawlers in a mutually reverse rotation state. Steering device for a mobile agricultural machine, comprising a side clutch lever for increasing a duty ratio of a pulse signal for use in proportion to a tilt angle. 2. A steering apparatus for a mobile agricultural machine, comprising: a left and right side clutch that connects and disconnects the drive of the left and right traveling crawlers; and a spin turn clutch that interlocks the left and right traveling crawlers in a mutually reverse rotation state. A steering device for a mobile agricultural machine, which is provided with a side clutch lever for increasing the hydraulic pressure for use in proportion to the tilt angle.