JPS63222935A - Travel control device for mobile agricultural machinery, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a travel control device for a mobile agricultural machine.
Can be used for combine harvesters, seedling transplanters, tractors, transport vehicles, etc. The present invention relates to a travel operating device in which a speed change lever for performing a speed change operation of a travel transmission device is provided with an operation switch that expands and contracts a hydraulic cylinder by a hydraulic circuit to disconnect a main clutch.

Prior Art and Problems to be Solved by the Invention In a configuration in which a hydraulic cylinder is telescopically operated by an operation switch provided on a gear shift lever and a main clutch is manually operated by belt tension, other hydraulic circuits are connected to the same hydraulic pump. When a clutch control valve for the main clutch is provided together with a lift control valve for raising and lowering the work equipment, the clutch control valve is usually provided in a hydraulic circuit using a hydraulic pump, and the lift control is applied to the hydraulic circuit passing through this clutch control valve. Although valves are provided, when the operations of these two control valves overlap, the timing of one of the control valves is likely to be delayed or malfunction may occur.

Means for Solving the Problems This invention provides a variable speed transmission device (2) for transmitting power to a traveling device (1).
) in a mobile agricultural machine, etc., in which a shift lever (3) for operating the shift lever (3) is provided with an operation switch (5) for operating a main clutch (4) by a belt tensioner (4) that transmits input to the shift transmission (2). A clutch control circuit (
17) and a lift control valve (2o) that lifts and lowers the working device.
A travel operating device is configured in which a lift control circuit (21) having a lift control circuit (21) is branched so as to be hydraulically operated from the same hydraulic pump (22) and is connected to the lift control valve (20).

Operation of the invention Transmission to the traveling bag m(1) involves transmitting power from the prime mover to the variable speed transmission (2) via the main clutch (4). This is done through the variable speed transmission (2). When changing gears using the gear shift lever (3), first shift the gear lever (3) before operating the gear shift lever (3).
3) While holding it, press the operation switch (5) to turn it on.
By doing so, the clutch control valve (1) of the clutch control circuit (17) is operated, the hydraulic cylinder (6) is operated to expand and contract, and the main clutch (4) can be disengaged by the belt tension. Turn the operation switch (5) to O.
When set to FF, this main clutch (4) can be engaged. With this operation switch (5) turned ON and the main clutch (4) disengaged, hold the gear shift lever (
3) to rotate to a predetermined shift position.

When lifting or lowering a working device attached to the machine body, such as a reaping device (82), the lifting control valve (20) of the lifting control circuit (21) is used.
), but this lift control circuit (21) branches the clutch control circuit (17) from the hydraulic pump (22) through the clutch control valve (18) to operate the clutch control valve (18). The clutch control (18
), regardless of whether the main clutch (4) is turned on or off, the lift control valve (2
elevating and lowering control according to (o) can be performed.

Effects of the invention In this way, the clutch control valve (1) is connected to the hydraulic pump (22).
A clutch control circuit (17) connected to the lift control valve (2o) via 8) is connected directly from the hydraulic pump (22) to the lift control (20) to constitute the lift control circuit (21). Therefore, the hydraulic pressure sent from the hydraulic pump (22) is always working on the clutch control circuit (17), and controls the main clutch (4), in particular, performs the disengagement operation using the hydraulic pressure of the main clutch, and also controls the clutch control circuit (17). While performing the control, it is also possible to perform elevation control using the elevation control valve (20).

Embodiment In the illustrated example, a transmission case (20) is provided at the front of the traveling body (7) of the combine, and a drive shaft (2e) that is transmitted and rotated by the prime mover (25) and the transmission case (2
4) Pulley (2?) between the upper input shaft (13)
(28) Pass the belt (28) between the bells) (
The tension pulley (32) of the tension arm (31), which is rotatable around the clutch arm shaft (30), is brought into pressure contact with the rotating peripheral part of the main clutch (4).
The configuration is such that the The clutch arm shaft (which is rotatable and passes through the upper end of the transmission case 20 in the lateral direction)
30) is provided with a hydraulic cylinder (6), a lever (8), a tension spring (33), etc. on the side opposite to the belt (29) side. The ends of the pistons (39) of these hydraulic cylinders (6) are connected to an arm (37) that is integrated with the clutch arm shaft (30), and the base of the hydraulic cylinders (6) is connected to the body (7). The hydraulic cylinder (6 ) is configured to change and adjust the position along the vertical expansion/contraction direction.A rack (36) is placed in the rotation range of this lever (8), and the transmission case (2
4) Installed on the bracket (5G) that is integrated with the part, and attach the lever (
8) The rotation is adjusted by changing the locking position. The tension spring (33) is attached to the clutch arm shaft (
30) between the arm (3B) and the fuselage (7),
The hydraulic cylinder (6) is constantly tensioned in the direction of contraction, and the tension pulley (32) is elastically biased to be tensioned toward the belt (28) and the main clutch (4) is engaged. ing.

These hydraulic cylinders (6) and tension springs (
33) etc. are provided with an adjustment mechanism.

The piston (39) of the hydraulic cylinder (6) and the arm (3
Between the plate (41) which is slidably fitted to the bottle (40) of 7) via an elongated hole, there is a nut (42) that is screwed into the threaded part at the tip of the piston (39). ) etc., play against this piston (38)) (41
) so that the mounting position of the plate (41) and arm (37) can be adjusted freely, and the hydraulic cylinder (6) is set to its shortest position.
The tension spring (33) is connected and adjusted so that the bottle (40) is positioned at the upper end of the elongated hole, and then fixed with a bolt (42) (Fig. 5). 43) and a nut (44) screwed thereto, the arm (38) is connected to the pin (45) and adjusted so that the gap between the tension springs (33) is maintained at a constant distance ( Figure 2).

An arm (4) is attached to the tip of the clutch arm shaft (30).
6), and the bottle (47) of this arm (4B),
The rod (48) connected to the brake (4B) is provided so as to be movable and adjustable in relation to the elongated hole of the rod (48), and the relative position of the bottle (47) with respect to the elongated hole is adjusted within a certain range (
Figure 6).

The gear shift lever (3) is rotatably mounted on the upper end of the transmission case (24) around a horizontal axis (51) by means of a bracket (50), and is attached to the control panel (11) on the side of the cockpit (12).
) is inserted into the guide groove (52) provided in the guide groove (52).
) can be operated forward and backward. The speed change lever (3) is connected to the arm board (55) of the speed change shifter shaft (50) via the load 2 rod (53), and by rotating the speed change lever (3) back and forth, the speed change shifter shaft (54) This is a configuration in which the speed change transmission device (2) is operated in conjunction with the rotation of the speed change transmission device (2).

A rack (56) is formed on the rotating periphery of this arm board (55), and it is turned on and off by sliding a limit switch attached to the bracket (50), and the shift thick shaft (54) is positioned at the appropriate shift position. For example, when the limit switch is located on the four parts of the rack (58), it is turned on, and when it is located on the convex part, it is turned off, and the limit switch is turned on to detect whether the hydraulic cylinder (58) is activated. The clutch control valve (18) in the clutch control circuit (17) of 6) is configured to be operated by a solenoid to disengage the main clutch (4) when the clutch control valve (18) is turned ON.

Along the rotating side of the gear shift lever (3),
(50) is provided with a locking rack (1B), and a locking pin (57) integrated with the speed change lever (3) is provided so as to be engaged therewith. One end of this locking rack (16) is a bracket) (5
0) so as to be movable up and down about a shaft (58), and the other end is tensioned upward by a spring (58) and is configured to be freely rotatable against a spring (59).

A rack formed on the upper peripheral edge of the locking rack (16) is used to engage the locking bin (57), and is used to engage the locking bin (57).
) and the rack (56) of the arm board (55), the neutral position (N), forward positions il+1 (Fl) to (FEI), and reverse position (R
1), (R2), etc. are formed in the recessed portions, and when the locking pin (57) is engaged in the neutral position (N), the gear shift lever (3)
is locked so that it cannot be rotated to either the forward or reverse side, but the neutral position l? Forward position (Fl) to (FEi) other than 1 (N), or reverse position 1i (R1),
The concave portion (R2) tilts the locking edge on the neutral position (N) side to rotate the gear shift lever (3) toward the neutral position (N) against the rack pressure exerted by the spring (58). At this time, the locking pin (57) is configured to slide on this inclined locking edge and rotate appropriately toward the neutral position 1 (N) side.

The elongated hole (60) of this locking rack (1B) and the arm (96) of the clutch arm shaft (30) are connected by a telescopically adjustable rod (6) with a turnbuckle, and a tension pulley (32 ) operates to the main clutch disengage position, the locking rack (16) is moved by the spring (59) via the rod (61).
) and pull the locking bottle (57) against the locking rack (
16) from the engaged position, and when the tension pulley (32) operates to the main clutch engaged position,
The locking rack (16) is set to be engaged with the locking bin (57). (82) is a neutral position sensor that detects that the gear shift lever (3) is in the neutral position 21 (N), which constitutes the starter circuit of the prime mover (25), and which is detected by the neutral position sensor (62). ), the starter can start the prime mover (25).

The variable speed transmission device (2) has a constantly meshing variable speed gear (85) and a neutral gear between the input shaft (13) in the upper part of the transmission case (24), the variable speed shaft (83), and the neutral shaft (64). (ee), a reverse gear (67), etc. are provided, and a transmission shaft (63
) is connected to the transmission gear (85) disposed on the transmission shaft (63).
) in the key groove (88).
) by selectively engaging this shift key (69).
The engaged transmission gear (B5) is rotated as one body with this transmission shaft (63), and the intermediate shaft (B5) is rotated through the neutral gear (6B).
The base of the shift key (89), which is configured to transmit power to B4), is engaged with a cam groove (70) on the extension of the shift shaft (63) and supported by the slider (71). By engaging this slider (71) with the shifter (72) of the thick shaft (54) and moving it in the axial direction, the neutral position
The configuration is such that the gear can be changed from (N) to forward positions (Fl) to (FB), reverse position (old), and (R2).

a center gear (73) that is transmitted from an intermediate shaft (64);
A steering clutch (74) that engages and disengages on both left and right sides of this center gear (73) is mounted on a clutch shaft (75), and by operating this steering clutch (74) with a shifter (78), The steering clutch (74) has a configuration in which the steering clutch is operated, and this steering clutch (74) is provided on the outside of the steering clutch (74).
74) Steering brake (4) that brakes the steering when turning
8). In addition, the left and right steering brakes (48) are operated by the shifter (77) to operate the steering clutch (48).
By applying direct braking regardless of the steering clutches (74), when the left and right steering clutches (74) are engaged,
The configuration is such that when one steering brake (48) is braked, the left and right steering clutches (70) are braked.

(78) is a wheel gear that is always engaged with each clutch (70 gear), and is provided integrally with the wheel shaft (78).
79) constitutes a transmission structure for the crawler sprocket (80) of the left and right traveling devices (1).

The traveling aircraft (7) is provided with a threshing device (81) extending from the side of the cockpit (12) to the rear.
While cutting and transporting the husk in front of the threshing equipment 21.
(81) is provided with a reaping device 2i (82). The threshing device (81) is configured to be driven by the drive shaft (2B), while the reaping device ffl (82) is configured to be driven by the output pulley (83) on the input shaft (13).

In addition, the reaping device a (82) is configured to control the vertical movement of the traveling machine body (7) by expanding and contracting a hydraulic cylinder (80). A clutch control circuit (17
), and from the branch to this clutch control circuit (17), via a throttle valve (23), a lift control circuit (21) having a lift control valve (20) and the hydraulic cylinder (80, etc.).
Furthermore, the shifter (7) of the steering clutch (74) is connected to the lift control valve (20) of the lift control circuit (21).
A steering control circuit (87) consisting of a hydraulic cylinder (85), a steering control valve (86), etc., which hydraulically operates B) is connected to the steering control circuit (87).

In addition, (98) is a throttle valve, and the clutch control circuit (17)
Limits the hydraulic flow on the gear shifting side to reduce abnormal noise. (H
) is a relief valve. When the throttle valve (88) is provided, the configuration may be such that the throttle valve (19) is not provided, and the throttle valve (98) is used to slowly drain oil from the hydraulic cylinder (6) and smoothly operate the main clutch (4). can be put in.

Further, the elevation control valve (20) is a clutch control valve (18).
It is configured as a stack valve together with a steering control valve (88), etc., and a bypass passage (100) is provided at the raised position where the hydraulic cylinder (84) for raising and lowering is switched to the raised position.
The hydraulic pressure from the hydraulic pump (22) is configured to be able to be sent to the hydraulic cylinder (84) both through a path that passes through the clutch control circuit (17) and a straight bypass path that does not pass through this path.

The operating switch (5) of the gear shift lever (3) forms a parallel circuit with the switch based on the operating position sensor (9), and when either of these switches (5) or (9) is turned ON, the clutch control valve ( 18) to disengage the main clutch (4), but when both switches (5) and (9) are turned OFF, the clutch control valve (1
8) is in a neutral state and the tension spring (33
) The hydraulic cylinder (6) is shortened by the tensile force of the main clutch (4), so that the clutch restraining device (io) is configured. (88) is a main switch, and (89) is a battery.

In addition, the hydraulic cylinder (6) of the main clutch (4) has a double piston cross-section, with a sub-piston (80) fitted onto the piston (38) so as to be movable at a fixed distance.
39), the auxiliary piston (90) has a large hydraulic cross-sectional area, so when hydraulic pressure is sent into the cylinder (6) and the main clutch (4) is disengaged, it operates quickly, but vice versa. When the hydraulic pressure is discharged and the main clutch (4) is engaged, it is set so that it operates slowly at first and operates quickly in the latter half.

a hydraulic cylinder (6) of the clutch arm shaft (30);
A cover (91) that can be opened and closed is provided on the curved surface of the control console (11) on the side of the cockpit (12) on the front side of the tension spring (33), etc., and each adjustment section can be accessed from the foot of the cockpit (12). Adjustment operations can be performed. Also, these adjustment parts are located under the control console (11). , (12), the side plate (92) at the bottom of the control platform (11) may be configured to be openable and closable for adjustment.

(93) is the steering lever that manually operates the steering control valve (86), (84) is the main clutch lever that manually operates the clutch control valve (18), and 1 (95) is the main clutch lever that operates the clutch of the threshing device (81), etc. The threshing clutch lever 2 (97) to be operated is a clutch pedal that operates the main clutch (4).

When the gear shift lever (3) is set to the neutral position It (N),
In the shifter (12) with the shift thick shaft (54), the shift key (68) is located in the groove of the neutral gear (66), and the shift transmission (2) is connected from the input shaft (13) to the shift shaft (6).
3) is not activated, and even if the main clutch (4) is in the engaged position, no power is transmitted to the traveling gear (1), and even if the gear shift lever (3) is operated back and forth at this time. Since the pin (57) of this lever (3) is engaged with the neutral position (N) of the locking rack (18), a gear change operation cannot be performed.

To perform a gear shift operation, press the operation switch (5) to turn it on, which activates the clutch control valve (18) and extends the hydraulic cylinder (6) to move the clutch arm shaft (30) against the tension spring (33). Rotate the locking rack (16) via the low and low gear levers (81).
) from the bottle (57), and remove the tension pulley (32).
is separated from the belt (29) and the main clutch (4) is disengaged. Furthermore, while pressing and holding this operation switch (5), shift the gear/<- (3) from forward position (Fl) to (FB).
, or to a selected position such as the reverse position (R1) or (R2).

When you release the operation switch (5) at this selected position to turn it OFF, the clutch control valve (1B) becomes the neutral position.
The main clutch (4) is engaged by the tension spring (33), and the locking rack (16) is returned by the return of the rod (61) and the spring (59), and the locking pin of the gear shift lever (3) (57) is locked in the shift position.

At this time, the speed change key (68) corresponds to the speed change gear (65).
The operating position sensor (9) may not engage accurately with the
When the shift lever (3) does not detect the correct shift position, the switch by this operation position sensor (9) is set to OFF.
Since the main clutch is in the N position, even if the operation switch (5) is released and turned OFF, the clutch check device (IO) will operate and prevent the main clutch from being disengaged and then engaged.

To adjust the timing of the main clutch (4), operate the lever (8). When this lever (8) is rotated in the direction of the arrow (A), the eccentric pin (35) rises and raises the support position of the hydraulic cylinder (6), so that the main clutch (4)
The entry of the lever (8) becomes slower, and on the other hand, the lever (8) is moved in the opposite direction (
A) If you adjust the rotation in the direction, it will become faster. Also, since the piston (38) of the hydraulic cylinder (6) of this main clutch (4) has a sub-piston (90), the movement of the tension pulley (32) when the main clutch (4) is engaged is as shown in Fig. 8. The stroke music becomes MA (b), and at this time the lever (8)
By adjusting the timing of the main clutch (4) to d, it becomes curve (C), and if it is made faster, it becomes curve M.
If the position where the main clutch (4) engages, which is A (d), is a constant position (e), then each position (ho) on the stroke curve (c) delayed from the stroke curve (b) at the standard position, for example. ) The main clutch (4) can be turned on with a delay corresponding to the time difference ( ).

Move the gear shift lever (3) to forward position 124 (Fl) to (F8)
, or to the reverse position (old), (R2) and when the driving force a (25) is stopped, the hydraulic pump (22) is stopped and the main clutch (4) is operated by the tension spring (33).
However, when returning the shift lever (3) to the neutral position (N), the locking pin (57) slides on the locking rack (is) and the shift lever (3) is engaged. , and the shift key (69) also returns to the neutral gear (66) position.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a side view, Fig. 2 is a front view thereof, Fig. 3 is a plan view thereof, and Fig. 4 is a partially enlarged side view, and Fig. 4 is a partially enlarged side view. Figures 5 and 6 are partial side views,
Fig. 7 is an enlarged sectional view of a part, Fig. 8 is a diagram of its action curve,
Fig. 9 is a partially enlarged cross-sectional view, Fig. 10 is an electric circuit diagram,
Figure 11-1 is a hydraulic circuit diagram, Figure 11-2, Figure 11-
3 is a sectional view showing the operation of a part thereof, FIG. 12 is a side view of the combine, FIG. 13 is a plan view, and FIG. 14 is a front view. In the figure, code (1) is a traveling device, (2) is a speed change transmission device,
(3) is the gear shift lever, (4) is the main clutch, (5) is the operation switch, (6) is the hydraulic cylinder, (7) is the aircraft body, (
8) is a lever, (9) is an operation position sensor, (lO) is a clutch check device, (11) is an operation console, (12) is a cockpit, (13) is an input shaft, (14) is a belt, (15) is a ) is the tension pulley, (te) is the locking rack, (17)
is a clutch control circuit, (18) is a clutch control valve, (1
9) is a throttle valve, (20) is a lift control valve, (21) is a lift control circuit, (22) is a hydraulic pump, (23) is a throttle valve,
(100) indicates a bypass path.

Claims (1)

[Claims] An operation of turning on and off the main clutch (4) by inputting and transmitting belt tension to the speed change lever (3) that operates the speed change transmission device (2) that transmits the transmission to the traveling device (1). In a mobile agricultural machine or the like equipped with a switch (5), a clutch control circuit (17) having a clutch control valve (18) that operates the main clutch (4) on and off, and a lifting control valve (17) that operates the working device to raise and lower it. A travel operating device in which a lift control circuit (21) having a lift control valve (20) is branched so as to be hydraulically operated from the same hydraulic pump (22) and connected to the lift control valve (20).