JPS60151405A - Control device of variable capacity motor - Google Patents

Abstract

PURPOSE:To improve safety by a method wherein the tilting angle of the swash plate or bent axis of a motor is made larger by means of the influx port pressure of the motor. CONSTITUTION:An orifice 23 is provided between the oil guide holes 21 and 22, both of which are connected to a three port connection throttling valve 5. A sequence valve 24, to which the influx port pressure of a motor 3 is applied as a pilot pressure, and a pilot valve 29 are connected to the oil guide hole 22. As a result, the tilting angle of the swash plate or bent axis of the motor 3 can be made larger by means of the influx port pressure of the motor 3, resulting in preventing the motor from turning backwards and the load from falling and improving the safety.

Description

[Detailed description of the invention] The present invention relates to a control device configured to perform the following operations.

IVl? A variable displacement hydraulic motor using a hydraulic pump? In a winding device that rotates a winding drum to take up or unwind a wire rope and raise and lower a load (fl load), the winding drum is rotated to reduce the power loss of the hydraulic pump drive motor. When the brake is applied, the pressure of the hydraulic pump decreases, and if the pressure of the hydraulic pump decreases, the pressure of the hydraulic motor also decreases.
When the pressure of the hydraulic motor decreases, the tilting angle of the swash plate or slant of the hydraulic motor should be minimized.In this state, the brake of the winding drum is released and the load is removed. If you try to raise the load, the hydraulic motor will lift the load because the tilt angle of the hydraulic motor's signboard or oblique shaft is at its minimum.
It is not possible to generate enough torque to raise the load, so there is a risk that it will be reversed by the hydraulic motor or something and the load will fall.

The present invention is based on the actual situation described above, and is designed to prevent a variable capacity oil I'F motor from rotating in reverse due to a load when the brake is released to lift something. It was made for the purpose of offering culms.

IJT', the implementation of the present invention will be explained with reference to the drawings.

No. 1171 is an embodiment of the present invention, in which 8
A servo piston 2 is disposed so as to be movable in four directions, and the tip of the servo piston 2 is connected to a control lever 4 so as to change the tilting angle θ of a swash plate or oblique shaft of a variable displacement motor 3.

There is a large diameter part 5 in the body main body 1 in the servo piston 2 and γ row.
A 3-port crest valve 5 with a, 5b, 5c2A and small diameter portions 5d, 5c is slidably arranged, and an arm 6 fixed to the externally protruding portion of the piston 2 marked nt+ is connected to a U-shaped The rod 7 fixed to the 3-port throttle valve 5 is bent to the outside of the body 1 and protrudes to the outside of the body 1. Attach the rods 8 and 1' to the tip of the rod 7.
Feedback spring 9 between rlI record 1\6
The spring 9 causes the 3-port throttle valve 5 to
so that it can be biased toward the right in FIG.

Anti-piston rod extension 1 oil chamber 10 and 3 of servo piston 2
Are the oil chambers 12 or 2 of the port throttle valve communicating? 1; Drill an oil guide hole 16 in the body main body 1 so that the
Pressure oil from the 6E man port is supplied to the piston Rondo side oil chamber 11 of the servo piston 2 via the pipe 17? An oil guide hole 18 is formed in the body main body 1 so as to communicate with the oil guide hole 18, and an oil guide hole 19 provided in the body main body l so as to communicate with the oil guide hole 18 is inserted through the oil guide holes 20, 21, and 22. An orifice 23 is provided between the oil chambers 15, 13, and 14 of the 3-boat throttle valve 5, and an orifice 23 is provided between the oil chambers 14 of the 9 oil holes 19 between the oil chambers 14 of the 9 oil holes 19. Warped! The end of 11N+ is opened 11 outside the main body 1, and a pipe 26 equipped with a sequence valve 24 and capable of returning oil to the tank 25 is connected to the opening of the oil gauge hole 22, and the pipe 26 marked with +iU 17 and the sequence fr24 are connected by a pilot pipe 27, and the pipe line 26 is shorter than the sequence valve 24 by t: 1 ft.
A classification pipe 28 equipped with a pilot valve 29 is connected to the required position of 1111 so that the oil is returned to the tank 25.
The oil chamber 12 of the oil chamber 12 is connected to the oil chamber 12 of the oil chamber 12, and the oil holes 3o opened to the exterior of the main body 1 are bored through the four oil holes 3o, and the oil flowing out from the oil holes 30 is transferred to the tank 25' through a pipe line 31. \JRL
? '4.

In operation IIl, the set pressure of the sequence valve 24 is lower than the set pressure of the pilot valve 1 and 29, and is regulated.

For example, when the brake is applied to the volume I drum, the discharge pressure of the hydraulic pump is low, and therefore the IA of motor 3 is
[Human port l] τ force is also decreasing.

In this case, the sequence valve 24 opens and the pilot valve F2
9 is closed 11. Therefore, the pressure oil from the pipe 17 to the oil lead hole 18 is returned to the tank 25 through the oil lead hole 19, 22, the pipe 26, and the sequence force 24, and the pressure of the pressure oil is 4 From oil holes 19 and 20 to oil chamber 15, from four oil holes 19°21 to oil chamber 13, oil guide hole 19, orifice 23.
Each of the four oil holes 22 acts on the oil chamber 14. Therefore, the forces acting in the axial direction on the sides of the large diameter portions 5b and 5c in the oil chamber 13 cancel each other out, so that the three-port throttle valve 5 has a force acting on the oil chamber 15 and the force acting on the oil chamber 14. <Q+l-> at a position where the differential pressure with the force balances the force of the feedback spring 9. In other words, as is clear from Fig. 2, ``='ch ''''-(7'd+-Δ7))(S,-5
, ) is stopped at device f where the relationship holds true. In this position, when the inlet port pressure of the motor 3 is lower than the set 11: force of the sequence valve 24, the three-boat throttle valve 5 or the feedback spring 9 moves to the left in FIG. Oil guide hole 16, oil -; (13, is the position where it communicates with the oil guide hole 21 6 In the formula 1, F1 is the force of the feedback spring 9, l) d + is 19 to the oil 3ζ15
Δρ is the passage resistance of the orifice 23, S is the cross-sectional area of the large ff portion 5c of the 3-port throttle valve 5,
S7 is the cross-sectional area of the rod 7.

If the oil chamber 10 and the oil guide hole 21 are in communication, this line is connected to the I+? of the motor 3. [Since the input port is under pressure, the servo piston 2 moves to the right in Fig. 1,
As a result, the tilting angle θ of the swash plate or the oblique shaft of the motor 3 is maintained at 1°1ψ through the control lever 4.

, 31, 4-+ drum brake is released and motor 3
When the load is lost, the motor 3 tries to reverse direction)/+The pressure of the boat is sealed (bumping 1151). For this reason, the pipe line 17, the oil chamber 18, 19,
The pressure in the pilot line 27 and the like also rises by -F, and when the pressure in the pilot line 27 exceeds the set pressure of the sequence valve 24, the sequence valve 24 closes. Therefore, the oil in the oil guide holes 19.22 is not discharged, and the pressure in the oil chamber 14 also rises to the same level as that in the oil chambers 15. Large FF within 14
The position is balanced with the differential pressure of the force acting against the feedback spring 9 acting on the parts 5c and 5allil. i.e. sequence valve? 24, when both the pilot valves 29 are closed, as is clear from FIG.

Balance is achieved using a device that holds the following relationship. This position is located at the large ff section 5 of the 3-port aperture lina I-5 as shown in
b is the position where the four oil holes 16 are blocked, and the servo piston 2 is in a position where the differential pressure caused by the pressure acting on the feedback spring 9 and the oil chamber 11 is balanced. ”: In the formula, F2 is the force of the feedback spring 9, and Pd□ is the pressure of the oil in the oil chamber 15.

Furthermore, when the inlet port pressure of the motor 3 increases to exceed the set pressure of the pilot valve 29, the pilot valve 29 opens and the pressure in the oil chamber 14 and oil guide hole 22 of the 3-port throttle valve 5 rapidly decreases. , 3 boat throttle rib r5 is motor 3
Due to the differential pressure between the inlet port pressure of the motor 3 and the set pressure of the pilot valve 29, it overcomes the resistance of the foothuck spring 9 and moves to the left of the Due to the differential pressure gradient with respect to the set pressure, the force exerted on the three-port throttle valve 5 moves to a position balanced with the horn of the feedback spring 9.

In other words, when the pilot; F29 operates, as is clear from FIG.
The 3-port throttle valve 5 is moved until the relationship of d3-Δ7')rs, -5,) is satisfied. 1: In the formula, F3 is the force of the feedback spring 9, and Pd is the pressure of the oil in the oil chamber 15.

When the 3-boat throttle rib f5 moves to the left in FIG. The primary pressure acts on the oil chamber 1o of the servo piston 2. For this reason,
The servo piston 2 moves to the right in FIG. 1, and the control lever 4 increases the tilt angle θ of the swash plate or slant shaft of the motor 3. Since the m1 rotation speed of the motor 3 decreases, the output torque of the motor 3 increases. becomes larger and constant pressure control is performed)
It will be done. Therefore, the motor 3 is not reversed by loads, etc., and the brake is released n1147. H can prevent the load from falling by +1-shi.

In addition, in the embodiment of the present invention, the case where the variable displacement heavy type motor is applied to the winding device has been explained, but it is not limited to this. It goes without saying that it can be implemented by opening and closing the conduit, and that various other changes can be made without departing from the gist of the conduit invention.

According to the control device for the t+' (transformation motor) of the present invention,
Since the tilting angle of the swash plate or f of the motor can be increased, the motor will not be reversed by the load, thus preventing the load from falling and increasing safety. Various excellent effects can be achieved, such as improved performance.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2, FIG. 3,
FIG. 4 is an explanatory diagram of the relationship between the force due to pressure oil acting on the feedback spring and the 3-port throttle valve. In the figure, 1 is the body, 2 is the servo piston, 3 is the motor, 5 is the 3-port throttle valve, 6 is the arm, 7 is the rod, 9 is the feedback spring, 10, 11, 12.13
．． 14.15 is an oil chamber, 16 is an oil guide hole, 17 is a pipe line, 18
．． 19.20.21.22 is oil feed hole, 23 is orifice, 24 is sequence valve, 26 is pipeline, 27 is pilot pipeline, 28 is branch pipeline, 29 is pylon l□ jF,
Reference numeral 30 indicates an oil guide hole, and reference numeral 31 indicates a pipe line. Figure 25 25 Figure 2 Shin 3 Son Figure 4

Claims (1)

[Claims] 1) A servo piston that changes the tilt angle of the swash plate or nail shaft of the motor of the Town Hall, and the servo piston and I! A 3-port throttle valve is provided which is biased in the axial direction by a feedback spring in contact with the body, and a 101 pressure receiving part is provided on the body main body to which the motor inlet port pressure of 111 is expressed as mI. and the first one which is made to act on both sides of the three-port gauze f'f: part.
and a third oil guide hole for applying secondary pressure from the second four oil holes and the second oil guide hole to the other side receiving part of the servo piston through a three-boat throttle valve, An orifice is installed at the required position of the oil guide hole of m2 to control the amount of oil flowing into the pressure-receiving pressure ζ of the 3-port gas rib on the feedback spring side, and the motor inflow boat M force is lower than the predetermined pressure. Connect a sequence valve that opens when the pressure is high and closes when the motor inflow port pressure is high or a pilot valve that opens when the pressure is higher than the set pressure of the sequence valve. 1. A control device for a variable 8-year-old motor, characterized in that the servo piston is moved in a direction in which a tilt angle of a swash plate or a slant shaft of the motor increases.