JPS6255274A - Travel control device - Google Patents

Abstract

PURPOSE:To improve braking performance by providing a brake relief valve increasing the brake operating oil pressure in response to the rotating angle of an operating lever on a hydraulic circuit operating the traveling brake. CONSTITUTION:A brake relief valve 6 pressed by the pressing section 5 of an operating lever 1 is provided on the rotary base section of the operating lever 1. This brake relief valve 6 changes the brake operating oil pressure between the hydraulic pump of a hydraulic circuit 4 and a clutch operating cylinder and functions to increase the brake operating oil pressure as the inclination angle of the operating lever 1 is increased. Therefore, when the operating lever 1 is largely inclined and rotated, the driven rotation preventing force of a traveling device on which side a traveling clutch is disengaged is increased. Moreover, there is no backlash between the operating lever 1 and the valve 6, and brakes are applied correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention applies a strike brake that is applied when a strike clutch is disengaged to a stronger force in accordance with the rotation angle of an inclination rotation operation of an operating lever that engages and disengages the strike clutch. It is used as a travel control device in travel interlocking devices for combine harvesters and other mobile agricultural machinery.

Prior Art and Problems to be Solved by the Invention In the case of a strike brake, the control lever and the strike brake operated in conjunction with the control lever are interlocked for remote control via a link mechanism. , complicated adjustments are required due to looseness or play in the link, and the reliability of the brake is likely to decrease.

Means for Solving the Problems The present invention provides a hydraulic circuit (4) that operates a running brake (3) by disengaging the latch (21) which is moved by tilting and turning the operating lever (1). Strike control comprising a brake relief valve (6) which is pressed by the contact pressure part (5) at the base of +11 and increases the brake operating pressure of the hydraulic circuit (4) according to the rotation angle of the operating lever (1). The configuration of the device.

When the operating lever (1) of the invention is placed in the neutral position, the left and right running clutches (2) are both in the human state and power is transmitted to the left and right running devices by the hydraulic circuit (4). ,
The running direction is straight ahead. When the operating lever (1) is rotated from the neutral position to the left or right side in the strike direction, the hydraulic circuit (4) disables the strike clutch (2) on the operated side. , the traveling device is rotated toward the side where the running clutch (2) is disengaged. Furthermore, when this operating lever (1) is tilted and rotated to activate the strike brake (3) on the disengaged side of the strike clutch (2), the running gear on the disengaged side is braked by the braking action of the strike brake (3). This increases the certainty of concurrence by preventing follow-up.

In such a rotational operation of the operation lever +11, the rotation base of this operation lever (1) has a brake relief valve ( 6) changes the brake operating pressure of the hydraulic circuit (4), and this operating lever (1)
), the brake relief valve (6) pressure is operated so as to increase the brake operating pressure of the hydraulic circuit (4). Therefore, the operating lever (1)
The above-mentioned strike clutch (
2) The cutting prevention force of the traveling device on the cut side becomes stronger, and the traveling diameter can also be made smaller.

Effects of the Invention As described above, by tilting and rotating the operating lever (1), the running clutch (2) is disengaged via the hydraulic circuit (4) and the running brake (3) is also operated. As the inclination rotation angle of 1) is increased, the brake operating pressure of the hydraulic circuit (4) is increased;
Moreover, since this interlocking configuration is performed by directly pressing the brake relief valve (6) by the pressure contact part (5) of the rotating base of the operation lever (1), the operation lever (1) and the brake relief valve (6) ), it is difficult to cause play or rattling in connection with the operation, and the brake can be applied accurately.

Since it does not require an indirect interlocking mechanism such as a steering mechanism or a wire mechanism, it can be simplified.

Embodiment In the illustrated example, a pivot seat (8) that can be freely rotated in the front and back direction is pivoted by a left-right axis (9) on the top of a mounting case (7) that is attached to the control platform of the combine. At the top of this rotating seat (8) is a switch case (
The switch case (1) is pivotably supported by a longitudinal axis (11), and the operating lever (1) is provided within the switch case (1) so as to be tiltable and rotatable in any direction (back and forth (a), left and right (b)). This switch case (1 [operation/<
- The mounting configuration of (1) is such that a floating hole (121) is formed at the upper end of the switch case (Ill) to allow the operating lever (1) to tilt in a fixed direction, and a spring seat (1(1) is provided at the lower end of the operating lever (11). ) is springed downward by the spring (141), and there are contacts (inside the switch case (1) on both the left and right sides).
SWL) and (SWR) are provided, and the contact (SWL) is turned on by turning the operating lever (1) to the left with respect to the switch case (Iol), and the switching valve (SOL L) of the hydraulic circuit (4) is turned ON. , and also the contact (
Turn on the switching valve (one solenoid (SO
LR). The lower end surface of this switch case (l
stands out. This pressure contact part (5) is made of a separate member from the switch case (1), and is constructed so that it can be replaced due to wear or the like.

The brake relief valve (6) integrated at the bottom of the mounting case (7) is connected to the hydraulic pump (P) of the hydraulic circuit (4).
and the pipe communicating with the clutch actuation cylinder TIQ (
A spindle (spring I21 with an appropriate pressure between the spindle (21) and the brake relief valve (6) inserted into the sleeve (19) so as to be vertically movable is installed in the valve chamber (1) at the upper part of the valve chamber Oe (19). A catch plate (2a) is provided on the upper end of the spindle seat 1 to press the contact pressure part (5), and when the catch plate (2δ) is pressed down, the spring 121 is activated. Through brake relief valve (6)
It is something that strongly closes the door. (j is an oil drain pipe that communicates with the valve chamber (I8) and communicates with the oil tank.

An operation case Q9 is provided on the upper part of the transmission case Q4 that houses the travel transmission mechanism of the combine.
A piston (4) which is moved up and down by hydraulic pressure and a spring 120 is installed, and a pipe +21 of a hydraulic circuit (4) is connected to the head of this clutch actuating cylinder (IIEI) from a hydraulic pump (P) via a switching valve (19). The piston (3) is connected by the hydraulic pressure supplied from this hydraulic pump (P).
) is pressed down below a certain level, the brake relief valve (6) is connected to the pipe (function).The lower end of each piston is connected to the opposite clutch shifter O1 via rod G!91 etc. The clutch shaft OB is provided with a clutch gear (2) that can engage independently from the left and right sides of the gear (2) which is constantly driven to rotate, and this clutch gear (2) is connected to the shifter. The clutch (2) can be turned on and off by moving in the axial direction at e1m.A gear is further engaged with the clutch gear (2), and the clutch gear (2) is configured to interlock the left and right running shafts. A multi-plate brake (3) is provided at the outer end of the clutch gear (2), and the brake force can be increased by moving and pressing the clutch gear (2) with a shifter 0Φ.

Reference numeral 03 denotes a neutral position gray layer spring, which is provided around the rotation axis of the switch case (1) relative to the mounting seat (8), and a pin (03) protruding from the mounting seat (8) at the winding end of the spring 133. (b) and the pin 09 protruding from the switch case (111) are made to snap so as to be held at the same position from both left and right sides.

On the shaft (9) on which the mounting seat (8) is pivoted, there is provided a shaft (B) that rotates integrally with the mounting seat (8) via the shaft coupling OQ. Attach the arm (to) to the end,
From this, the switching valve 01) of the reaping hydraulic cylinder 01 that raises and lowers the reaping device is connected to the arm θ by a link.

Move the operating lever (1) around these shafts (9) in the front-back direction (
This is an interlocking configuration in which the switching valve cap (a) is switched by rotating to (b) to move the reaping device up and down with hydraulic pressure relative to the vehicle body. The pin 01 at the upper end of the arm (to) and the shaft (
The pin OQ, which is fitted into the arm H and is integral with the mounting seat (8), is held between the winding ends of the coil spring 0e wound around the axis (B). Operation lever (1)
The switching valve @1) is energized to return to its neutral position. When the pressure contact part (5) of the switch case (1ω) is rotated by the rotation of this operating lever (1) in the front-back (A) direction, the strike plate (2δ) does not move up and down, and therefore the brake relief valve (6 ) is set in such a way that the pressure does not change. ■ is the relief valve of the hydraulic circuit (4). (G)
is a battery.

To turn the running direction to the left or right during combine harvesting work, the operating lever (1) may be rotated to the left or right. When making a left strike turn, the control lever (1) is in the neutral position (
From Fig. 4), the contact (SWL) is turned ON by tilting to the left (Fig. 5), and this causes the solenoid (SOLL) to turn on.
, switch the switching valve t+9 to the left clutch operating cylinder (I [i)], and switch the hydraulic pump (P) to the operating side.
Hydraulic pressure acts on the left clutch actuating cylinder (IS) through the hydraulic pipe from When the clutch actuating cylinder (IGl) is lowered to a certain position, the inside of the clutch actuating cylinder (IGl is connected to the pipe (1), and the hydraulic pressure is applied to the brake relief valve (6). At this time, the piston (5) of the other right clutch actuating cylinder (le ) is in the closed position of the pipe (17), the oil pressure is increased in the pipes eI, (lη and the clutch actuating cylinder (le) to the pressure of this brake relief valve (6) and exceeds this pressure. When the pressure is reached, the brake relief valve (6) opens and the hydraulic pressure is transferred to the valve chamber (11).
It is returned to the tank via a pipe.

In this way, the left running clutch (2) is disengaged, but when the operating lever (11) is further rotated to the left, the left running brake (3) is applied to this running clutch (2). At this time, by rotating the operating lever (1) = 8
- The switch case (+01) is rotated around the shaft (11) integrally with this operating lever (1), and the catch plate (2δ) is pressed down by the contact pressure part (5) (Fig. 6). .The amount of descent of this strike plate (2δ) increases the tilt rotation angle of the operating lever (1) to the left.When the strike plate (2δ) is pressed down, the spring C
In order to increase the pressing force on the brake relief valve (6) via a11 and increase the oil pressure in the clutch actuation cylinder (6), the piston (271) is further depressed to increase the braking force of the running brake (3). This braking force increases in proportion to the tilt rotation angle of the operating lever (1).

When returning this operating lever (1) to the neutral position, the state will be as shown in Figures 6, 5, and 4, and the running brake (3) and running clutch (2) will also be in the same position as above. The opposite operation takes place. Further, when the operation lever (1) is rotated to the right, the operation is similar to the above operation.

When the reaping device is raised or lowered relative to the vehicle chassis, the operation lever (1) is rotated in the front-rear direction (A). At this time, the operating lever (1) is rotated in the front-back direction (A) because the mounting seat (8) is centered around the shaft (9) plow, so the switching valve is rotated through the arm (to), link (to), etc. 01
) is switched from the neutral position to the ascending side or descending side, and the hydraulic pressure of the hydraulic pump (P) is supplied to and discharged from the reaping hydraulic cylinder 00.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a front sectional view, Fig. 2 is a side sectional view, Fig. 3 is a front sectional view, and Figs. 4 to 6 show some functions. FIG. 7 is an enlarged sectional view showing a circuit diagram. In the figure, (1) is the operating lever, (2) is the running clutch, (3) is the running brake, (4) is the hydraulic circuit, (5) is the contact pressure part, and (6) is the brake relief valve number.

Claims (1)

[Claims] A pressure contact portion (5) at the base of the operating lever (1) is connected to a hydraulic circuit (4) that disengages the strike clutch (2) and applies the strike brake (3) by tilting and rotating the operating lever (1).
The travel control device is provided with a brake relief valve (6) that is pressed by the operating lever (1) and increases the brake operating pressure of the hydraulic circuit (4) according to the rotation angle of the operating lever (1).