JPS5867565A - Power steering lever and power steering control equipment with use of it - Google Patents

Abstract

PURPOSE:To obtain sensitive control without producing backlash in such a way that in a control equipment by means of pressure control system, on end off operation of a solenoid by one piece of power steering lever. CONSTITUTION:When a power steering lever 22 is tilted to the left, a microswitch 29 is turned on, a solenoid 19a of a solenoid valve 19 is excited, which moves the valve 19 to the right, oil is fed from a tank 24 through a circuit 20 into a cylinder 18 by a hydraulic pump 34, which thrusts a piston 17, and moves a rod 15 forward. Then, when an arm 13 is turned counterclockwise, a link mechanism 16 is operated through a turning center shaft 14 which is integrated therewith, a brake shoe 9 is widened in its diameter, which contacts a brake drum 7 with pressure, it prevents a side clutch 1 on the left side from its inertial turning, and the left turning is done just by turning the running part on the right side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-controlled power steering lever for moving agricultural machinery, construction machinery, etc., and an operating device using the same.

For example, in conventional machines of this type, in order to change direction, the side clutch of the inner running section of the turning section is disengaged, and
Next, the brake is applied to the traveling section on the cut side, and the power steering operating device for this purpose has two levers on each side, with the negative lever being used exclusively for operating the side clutch. , other levers may be used exclusively for brake operation. However, since this type of steering wheel requires a total of four levers, the power steering operating device becomes complicated and there is a high risk of malfunction. In order to solve this problem, there are systems that use link mechanisms, wires, etc. to reduce the number of levers, thereby simplifying the power steering operating device, but they do not provide sensitive control. There are some difficulties.

The present invention has been made to solve these problems in the prior art, and includes a novel power steering lever that can simplify the structure and improve operating accuracy at the same time. The purpose is to provide an operating device.

The present invention will be described below with reference to illustrative embodiments.

In Fig. 1, (1) and (1) are side clutch gears, which in normal conditions are engaged with the center gear (3) by the biasing force of coil springs (2) and (2), and are engaged with the left and right running section drive gear (4). )' is engaged with (4). (5)・(5
) is a shaft cylinder that is spline-fitted with the side clutch gears (1), (1), and the shaft (6) of the center gear (3) is fitted into the inner bore of the shaft cylinders (5), (5). The gear (3) is inserted into the shaft, and the brake drum (force is fixed) is attached to the outer end of the brake drum (8).
) are brake shoes.

In the same figure, tlQ) -QOI is an operating rod that releases the engagement of the side clutch gears (1) and (13), and is inserted into the grooves (1a) and (1a) on the outside of the gears (1) and (1). Fork-shaped fitting part (10a) to be fitted (+Oa
) and the rod (11) (1υ) and the abutting piece that abuts the lower end (
Job)・(10b) is formed into a side angle shape,
It is rotatably attached by a bin (IOC). (+21 is a cylindrical body that guides the rod (Ill up and down).

(131 is a rotating arm that pushes down the rod (11), and as shown in FIG. 2, the rotating center axis (14)
It is fixed to and extends to one side, and its lower edge forms an abutting surface (+3a) that abuts the upper end of the rod 0υ, and the upper edge abuts the lower end of the piston rod (15). It forms an abutting surface (13b).

At the outer end of the rotation center axis I, as shown in FIG.
A link mechanism Qe is provided to connect the brake shoe (9).
) to enable the operation of the shoe (9) in synchronization with the descent of the rod (Ill).The piston (17) at the upper end of the piston rod (151) moves inside the double-acting cylinder OgI. It is designed to slide by hydraulic pressure. ttS is a solenoid valve, and 翰 is a valve that sucks oil into the cylinder 0 barrel or drains oil from the cylinder (l) by switching the valve a. In order to do this, the cylinder (I
This is a circuit that opens at the end of 81. A groove (18a) for releasing oil is formed in the peripheral wall of the cylinder (!barrel) in the form of a ring, and a brake pressure adjustment circuit Cυ is opened therein.The solenoid valve a9, in FIG. It is an open center valve with attached solenoids (19a) and (19a).
9a) is connected to be excited by a microswitch (2g) that is turned on by tilting the power steering lever (22).

The brake pressure adjustment circuit (21) is provided with a throttle valve (2~) in the middle of which the amount of throttle can be adjusted by the power steering lever (221), and is open to the tank (2(a)).

The power steering lever (221) has a grasping part (22a) at its upper end, a horizontal pressing rod (22b) fixed at its lower end in an inverted T-shape, and a horizontal pressing rod (22b) in the middle thereof, as shown in FIG. The blade plate (22c) is fixed, and the part of the blade plate (Z2c) passes vertically through the frame (25j), and the blade plate (22c) is accommodated in the spring chamber (25a), and a coil spring (26) is formed. It is tiltably held in an upwardly pushed up state.

That is, the through hole (2) of the top plate c27) of the spring chamber (25a)
7a) has a smaller diameter than the through hole (28a) in the bottom plate, and the fill spring (A) is wound into a conical shape.

A pair of microswitches (21-(2!Jl) are attached to the left and right sides of the upper surface of the top plate (27), and their actuating pieces (29a
) - (29a) can pass through the top plate (2η) and advance above the spring chamber (Z5a), but under normal conditions it is pushed up by the blade plate (22c) and the microswitch device /29) is turned off.

The power steering lever @ horizontal rod at the lower end (22b
) The valve head (7) of the throttle valve (23) is biased against the lower part of the throttle valve (23). The end surfaces between the valve heads form an arcuate surface.

The throttle valve (23), as shown in FIG. It is connected to the lower end neck (31) of the head (00) via a spring (00).

In FIG. 5, (34) is a hydraulic pump.

Next, the main functions of the black power steering operating device configured as described above will be explained.

First, as shown in Figure 3, when the power steering lever @ is tilted to the left, the vane plate (22C) and the left microswitch operating piece (29a) separate and the microswitch (marked with 2 is on). As shown in Figure 5, the solenoid (19a) on the left side of the solenoid valve α wing
is excited to move the valve 00 to the right, and the hydraulic pump (
(b) sends oil from the tank (24) through the circuit (to) to the left cylinder 0, presses the piston αη, and advances the rod α9.

By advancing the rod (I5): Fig. 1, Fig. 2
As shown in the figure, the arm (13) rotates counterclockwise to push down the rod 0υ, thereby causing the left actuating rod a
Turn Q clockwise to disengage the left side clutch (1) and center gear (3). This operation is performed while the upper end surface of the piston (17) is lowered to the groove (18a) of the cylinder Ogl.

As mentioned above, when the arm (13) rotates counterclockwise, the link mechanism (!6) operates via the rotation center axis 04), which is integrated with the arm (13), and the brake shoe (9) expands in diameter to apply the brake. It comes into pressure contact with the drum (7) and prevents the inertial rotation of the left side clutch gear (tl), thereby preventing the rotation of the drive gear (4) with which it meshes and stopping its traveling part. A left turn is made by rotating only the right side running part around the running part.

In synchronization with this operation, the power steering lever (2
The lower horizontal pressure rod (22b) slopes upward to the right, and its left side presses the valve head (30) of the throttle valve (23).
, the needle (32) advances into the brake pressure adjustment circuit (21) via the spring 03) and throttles the flow rate.

Therefore, as the angle at which the power steering lever t22) is tilted to the left increases, the circuit pressure increases, the reaction force of the needle C32 increases, and the lever operation load becomes heavier.
The weight of the lever (24) can be used as a cue to determine the magnitude of the turn of the aircraft.

Note that the right turn is symmetrical to the left turn described above, so the operation can be performed accordingly.

As described above, according to the present invention, a single power steering lever is used to turn on and off the solenoid and directly control the pressure of the circuit, allowing for highly sensitive control without causing play in the device. I can do it. When the steering lever is used in a vehicle equipped with a side clutch gear and a brake in the transmission parts of the left and right running sections, the magnitude of the turning of the aircraft can be adjusted appropriately using the load of a single lever. .

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a power steering operating device embodying the present invention, Fig. 2 is a side view of the operating portion of the above operating device that is connected to the piston rod, and Fig. 3 A and 3 are the same as the above operating device. FIG. 4 is a vertical sectional view of a throttle valve connected to the power steering lever, and FIG. 5 is a hydraulic circuit diagram of the operating device. Explanation of drawing symbols 1...Side clutch gear 3...Center gear 1
0... Operating rod 11-15... Rod 18... Cylinder 19... Solenoid valve condyle 21... Hydraulic circuit 22... Power steering lever blade... Throttle valve 5...
・Frame body 29... Microswitch patent applicant Iseki Agricultural Machinery Co., Ltd. No. (a) Figure 3 (b)

Claims (2)

[Claims] (1) One lever body is tiltably mounted on a frame body and passes through the frame body, and a plurality of microswitches installed on the frame body can be operated by tilting the lever body. A vane plate fixed to a portion of the lever main body located inside the frame body for on/off operation can abut against the valve head of the throttle valve located at a position where the frame body and the shaft center are substantially aligned. A power steering lever characterized in that it is comprised of a pressing rod fixed across one end of the lever body so as to press the valve head by tilting the lever body. (2) In a vehicle that is equipped with a side clutch gear and a brake in the transmission parts of the left and right running parts, a pair of actuating rods that are operated to release the engagement of the side clutch gear with the center gear and simultaneously apply the brakes. A pair of retractable rods that actuate each operating rod, a double-acting cylinder that surrounds a piston connected to the rods, and a hydraulic pressure that connects a solenoid valve that simultaneously or selectively retracts and retracts the left and right rods. a circuit, an attached hydraulic circuit which connects a conduit portion of the hydraulic circuit to a circumferential wall surface of the cylinder to provide a throttle valve, and an attached hydraulic circuit which operates a throttle valve, and the throttle amount of the throttle valve can be adjusted by tilting the throttle valve to the left or right. The power steering lever consists of a power steering lever mounted on a frame body so as to operate the power steering lever, and two microswitches installed on the frame body so as to be selectively turned on by tilting the power steering lever to the left or right. . A power steering operating device characterized in that each microswitch is connected to a solenoid at both ends of the solenoid valve.