JPS5945854B2 - Variable speed fluid joint rotation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation control device for a variable speed fluid coupling that controls the output shaft rotation speed by adjusting the amount of hydraulic fluid.

1 The disadvantage of transmitting power based on the kinetic energy of the hydraulic oil circulating between the rotating impeller 2 on the input shaft 1 side and the rotating runner on the output shaft 4 side is the same as that of a general fixed oil flow type fluid coupling. but,
A further object of the present invention is to provide a rotation control device having a speed adjustment function of controlling the output shaft rotation speed by adjusting the amount of hydraulic oil circulating and rotating in the impeller chamber.

In a variable speed fluid coupling of variable oil flow type as in the present invention, it is possible to continuously adjust the output shaft rotational speed by increasing or decreasing the amount of hydraulic oil in the impeller chamber while keeping the prime mover at a constant speed. At the same time, the prime mover can be started without load.
It has the advantages of being able to be used as a clutch and absorbing vibrations and shocks, so it is widely used as an effective rotation speed control method for pumps, fans, blowers, etc.

Conventionally, the type of variable speed fluid coupling used is
The hydraulic oil 13 in the impellers 2 and 3 is scooped out using a scoop pipe 40 as shown in the figure, and is drained into the circulating oil tank 5.

That is, by moving the scoop pipe 40 from near the center of the impeller chamber toward the outer periphery, the scoop discharge amount of the hydraulic oil in the impeller chamber oil tank 41 is adjusted, thereby adjusting the impeller chamber oil amount 13.

The adjustment of the amount of hydraulic oil according to the present invention is different from the above-mentioned scoop tube method that has been widely used in the past, and is built in the balance valve body 14 of FIG.
This is to adjust the amount of hydraulic oil in the impeller chamber.

The present invention provides a variable speed fluid coupling in which a balun valve body 14 is fixed to the outer periphery of the main body of a rotating impeller 2 of an input shaft 1, and a balance valve 24 in the shape of a non-pool valve is attached to the balance valve body 14 with a radius This balance valve body 14 has an upper piston 25, an oil drain valve 26, and a lower piston 21 arranged at approximately equal intervals in order from the outside. An oil feed pipe 23 for applying balance valve operating oil to the outer surface of the piston 25, an oil drain passage 15 that opens to the outer peripheral portion of the hydraulic oil 13 of the rotary impeller 2 and the oil drain valve 26, and the oil drain valve 26. This variable speed fluid joint rotation control device is characterized in that an oil drain hole 16 is formed whose opening and closing is controlled by the oil drain hole 16, and the oil drain passage 15 is connected to the inner surface of the lower piston 2γ.

In the device of the present invention, the rotation speed detection pickup 50 attached to the output shaft 4 is connected to the fluid coupling device 30 via the amplifier 511, the comparator 53 having the set rotation speed storage circuit 52, and the output circuits 5 and 4. This hydraulic control valve 21 is connected to the hydraulic control valve 21 attached to the
The oil supply pipes 22 and 23 for operating oil whose oil pressure is adjusted in step 1 can be connected to the outer surface of the upper piston 25 of the balance valve 24.

In the device of the present invention, two oil drain valves 26 and 26' are disposed at a distance from each other in the balance valve 24, so that the oil drain hole 16' that can open into the oil drain valve 26' is balanced. Further, in the device of the present invention, the balance valve body 14 can be fixed to the outer periphery of the runner body, that is, the rotary impeller 30 of the output shaft 4 instead of the rotary impeller 2. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the balance valve type variable speed fluid coupling of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit for hydraulic oil and balance valve control oil according to the device of the present invention.

That is, the operating oil for controlling the balance valve 24 that is pumped from the circulating oil tank 5 by the oil pump 20 is added with the control oil pressure set by the oil pressure control valve 21, and is sent to the outer periphery of the two rotating impellers via the oil feed pipes 22 and 23. It acts on the outside of the upper piston 25 of the balance valve 24 which is mounted on the part.

This is shown in FIG.

On the L side, the hydraulic oil 13 in the rotating impeller 2 flows into the inner side 1γ of the lower piston 2γ of the balance valve with pressure due to centrifugal force.

Therefore, the operating oil pressure acting on the outside of the balance valve upper piston 25 is two pressures: the centrifugal force of the balance valve 24 body and the pressure 1γ due to the centrifugal force of the operating oil acting on the inside of the balance valve lower piston 2γ. It will be a matter of balance.

That is, 1) When the operating oil pressure Fp applied to the outside of the external piston 25 is larger than the sum of the centrifugal force Fv of the balance valve body and the pressure Fo due to the centrifugal force of the hydraulic oil applied to the lower surface of the lower piston 21, when Fp>Fv+Fo The balance valve in Figure 2 is pushed downward and the hydraulic oil drain passage 15
is closed, and the hydraulic oil in the impeller chamber is transferred to impeller 2 in Fig. 1.
The oil is drained from the oil drain hole n in the inner peripheral ring of the front casing and returned to the oil tank 5.

This will be operated under the same conditions as a normal metering type fluid coupling, resulting in the state of curve 81 in FIG. 4.

In this case, the amount of oil in the impeller chamber is maximum and the transmitted torque T
is also the largest.

2) When Fp=Fv+Fo, the speed is variable.

That is, by appropriately setting the operating oil pressure acting on the outside of the upper piston 25 using the operating oil pressure control valve 21, the area of the oil drain passage of the balance valve shown in FIG. be done.

That is, the fluid coupling can change the amount of rotational slip by adjusting the amount of hydraulic oil in the impeller chamber.

In other words, the output shaft rotation speed can be controlled by adjusting the operating oil pressure and changing the amount of hydraulic oil to adjust the amount of slip.

Curves 82 to 87 in FIG. 4 show the state when the operating oil pressure is sequentially reduced.

3) When Fp=0, the oil is completely drained, the operating oil is closed by the control valve, the operating oil pressure acting on the upper piston 25 becomes 0, the operating oil drain passage of the balance valve is opened, and the operating oil is balanced. Almost all oil is drained from the valve.

In other words, when the oil drain passage is opened, the amount of oil drained from the balance valve is larger than the amount of oil fed by the circulation oil feed pump 6, so it becomes almost empty in a short time, and a small amount of hydraulic oil is transferred by the circulation oil feed pump 6. is now circulating inside the impeller chamber, resulting in the state of curve a8 in Figure 4.

Reference numeral 1 indicates a cooler, and 8 indicates a hydraulic oil pipe.

As described above, the feature of the present invention is that a balance valve is installed in the impeller body, and the operating oil pressure acting on it is adjusted by the hydraulic control valve 21, so that the amount of hydraulic oil in the fluid coupling impeller chamber drained from the balance valve is controlled. change,
That is, the output shaft rotation speed is continuously controlled by varying and adjusting the amount of hydraulic oil in the impeller chamber.

In the balance valve type variable speed fluid joint using the variable speed fluid joint rotation control device of the present invention, the amount of hydraulic fluid can be controlled by simply adjusting the operating oil pressure acting on the outer surface of the upper piston 25 of the balance valve 24. The output shaft 40 rotation speed can be controlled.

The hydraulic pressure of the excitation oil 13, that is, the hydraulic pressure of the operating part of the impeller body acts on the inner surface of the lower piston 2γ of the balance valve 24 via the oil drain passage 15. The centrifugal force of Yohyo Tobiston 2
5, the balance valve slides inward or outward extremely rapidly and smoothly when the operating oil pressure is changed, controlling the output shaft of the hydraulic oil 13. The rotation of 4 can be set to a desired value.

In variable speed fluid couplings, it is important to suppress rotational fluctuations in the set output shaft rotational speed as much as possible.

As an embodiment of the present invention, the rotation speed of the output shaft 4 is detected by a non-contact pickup in FIG. The result is the output circuit 54
is fed back to the control valve to correct the operating oil pressure, adjust the area of the hydraulic oil drain passage of the balance valve, adjust the amount of hydraulic oil in the impeller chamber, and correct the output shaft rotation speed.

Since the amount of oil sent by the circulation oil pump is always constant, an electronic rotational fluctuation control mechanism such as the above-mentioned microcomputer is required to keep the output shaft rotational speed constant and reduce rotational fluctuations. .

In the above example, the balance valve is attached to the impeller body, but it may also be attached to the runner body, and a plurality of balance valves are attached on the circumference.

The balance valve 24 has an upper piston 25 on the outside to which operating oil pressure acts, a lower piston 27 to which the centrifugal force of the hydraulic oil 13 acts on the inside, and two oil drain valves 26 in the middle.
and 26'.

The two oil drain valves 26 and 26' are stabilized by suppressing the chatter vibration and high-pitched noise of the valves that occur when the hydraulic oil 13 flows into the passage 15 and into the valveless valve 24 and is discharged from the oil drain holes 16 and 16'. This is for draining the drained oil flow.

In the drawing, 9 is a control valve body, 10 is a hydraulic oil control valve, 11 hydraulic oil pipes, 12 is a hydraulic oil passage, 30 is a fluid connecting device, 42 is a communication hole, and 50 is a rotation speed detection pickup. be.

A brief explanation of the drawing.

Fig. 1 is a schematic longitudinal sectional side view showing the hydraulic oil and the operating oil circuit and the rotation speed fluctuation control circuit in an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional side view showing the balance valve, and Fig. 3 is a conventional squirrel valve. FIG. 4 is a schematic longitudinal sectional side view showing an example of a tubular variable speed fluid coupling, and FIG. 4 is a graph showing torque transmission characteristics.

□In the drawings, numeral 1 is the input shaft, 2 is the impeller, 3 is the feeder, 4 is the output shaft, 5 is the circulation oil tank, 6 is the circulation oil pump, 7 is the cooler, - is the oil piping, 91 is a control valve body, 1b is a hydraulic oil control valve, 11 is a hydraulic oil arrangement, 12 is a hydraulic oil passage, 13 is a hydraulic oil, 14 is a balance valve body, 15 is an oil drain inlet, 16 and 16' are oil drain ports, 17 is pressure, 20 is an operating oil pump, 21 is an operating oil control valve, 22 is an operating oil pipe, 23 is an operating oil pipe, 24 is a balance valve, 25 is an upper piston, 26 and 26' are oil drain valves, 2γ is a lower part piston, 3
0 is a fluid coupling device, 40 is a scoop tube, 41 is an oil tank for the scoop tube, 42 is a communication hole, al is when the hydraulic oil amount is 100%,
a2 to a7 are when the hydraulic oil amount is reduced, a8 is when the hydraulic oil amount is almost 0, A is a constant torque load, B is a reduced torque load, T is the load torque, N2 is the output rotation speed, N1 is the input rotation speed, 50 is a rotation speed detection pickup, 51 is a detection circuit, 52 is a storage device, 53 is a comparator, and 54 is an output circuit.

Claims (1)

[Claims] 1. In the variable speed fluid coupling, the balance valve body 14 is fixed to the outer periphery of the second rotating impeller main body of the input shaft j,
Lower balance □ Valve body 14 has the shape of a sujiru valve.Balance: Valve 24 is built in so that it can slide in the radial direction, and the balance valve 24 has an upper piston 25 and an oil drain valve 26 in order from the outside. and a lower piston 27 are arranged at approximately equal intervals, and this balance valve body 14 has an oil feed pipe 23 for applying the balance valve operating oil to the outer surface of the upper piston 25. 13 and the oil drain passage 15 that opens to the oil drain valve 26
Drainage oil tL whose opening and closing are controlled by 1 in 26
The variable speed fluid joint rotation control device is characterized in that the oil drain passage 15 is connected to the inner surface of the lower piston 27. 2 Rotation speed detection pickup 50 attached to the output shaft 4
is connected to a hydraulic control valve 21 attached to the fluid coupling device 30 via an amplifier 51, a comparator 53 having a set rotational speed memory circuit 52, and an output circuit 54, and the hydraulic pressure is adjusted by the hydraulic control valve 21. 2. The variable speed fluid joint rotation control device according to claim 1, wherein the oil supply pipes 22 and 23 for the operating oil are conducted to the outer surface of the upper piston 25 of the balance valve 24. 3 Two oil drain valves 26 and 26 are attached to the balance valve 24.
′ are arranged with a gap between them, so that the oil drain valve 2
An oil drain hole 16' that can be opened at 6' is located at the balance valve body 1.
4. The variable speed fluid joint rotation control device according to claim 1, wherein the variable speed fluid joint rotation control device is formed in the following claim. 4. The variable speed fluid joint rotation control device according to claim 1, wherein the balance valve body 14 is fixed to the outer periphery of the runner body, that is, the rotary impeller of the output shaft 4 instead of the rotary impeller 2.