JP2002048101A - Speed switching device for hydraulic rotating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable minute speed change with a simple structure by corresponding to the number of motors used. SOLUTION: Two hydraulic motors 17, 18, rotating a rotor 16, are connected in parallel by a directional control valve 29. A selector 38 is set into the hydraulic fluid supply and exhaust circuit 18a that branches from one circuit 31a of the supply and exhaust circuit of the control valve 29 to the motor 18. Also the selector 33 is connected to a bypass circuit 34 that branches from the other circuit 31b of the supply and exhaust circuit of the directional control valve 29. By the switching operation of the selector 33, the hydraulic motor 18 is interrupted to connect from the hydraulic pump 28. Furthermore, the hydraulic fluid supply and exhaust circuit 18a and 18b for the hydraulic motor 18 is short- circuited via a bypass circuit 34 to make a hydraulic fluid circulation condition. Then, only the hydraulic motor 17 is rotated by the hydraulic fluid from the pump 28, the motor 17 can be rotated at twice the rotation speed when two hydraulic motors 17, 18 rotate the rotor 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic rotating device for rotating one final shaft by a plurality of hydraulic motors, among hydraulic rotating devices such as a tubing device and a hydraulic auger used for foundation work such as construction and civil engineering. The present invention relates to a speed switching device.

[0002]

2. Description of the Related Art As shown in FIG. 8, for example, a hydraulic rotating device such as a tubing device or a hydraulic auger includes a plurality of hydraulic motors for rotating a single-shaft ring gear 2 via a pinion 1 for an output shaft. 3, a hydraulic pump 4 for supplying hydraulic oil to each hydraulic motor 3, a directional switching valve 5 for switching the hydraulic oil supply direction from the hydraulic pump 4, and hydraulic fluid supply / discharge circuits 6a, 6b of the directional switching valve 5. The hydraulic oil supply / discharge circuits 3a and 3b of the hydraulic motors 3 are each branched and each hydraulic motor 3 is connected in parallel. In many cases, the hydraulic motors 3 are applied to various construction methods. When the rotation load is small, it rotates at high speed and low torque,
There is a demand to rotate at low speed and high torque only when the load is large. Generally, a variable displacement hydraulic motor is used as the hydraulic motor 3, and the number of revolutions and the torque are changed by varying the amount of oil per rotation. However, the speed ratio of the variable displacement hydraulic motor is limited.

[0003] Therefore, the registered utility model No. 25671212
, A pinion of three or more hydraulic motors is interlocked to a single shaft ring gear, and a single directional control valve drives three or more hydraulic motors in the same direction. When a switching valve capable of switching the rotation of the hydraulic motor forward and reverse is connected in the middle of the oil supply / discharge passage on both sides between the direction switching valve and the one hydraulic motor, this switching is performed. The valve is switched in the reverse direction, and the hydraulic motor switched in the reverse direction by the ring gear rotated by another hydraulic motor acts as a pump, and the hydraulic oil acts between the hydraulic motor acting as the pump and the adjacent hydraulic motor. Circulates to cancel the output of an adjacent hydraulic motor and supply the entire hydraulic oil from the hydraulic pump to the remaining hydraulic motor, thereby causing the remaining hydraulic motor to rotate at high speed.

[0004]

However, in the above structure, a hydraulic motor paired with a hydraulic motor acting as a pump is required, and the number of motors that can be effectively used is reduced. For example, three or four motors can be used. Even with a hydraulic motor,
If you can only switch between two stages of high speed and low speed, and if you want to switch between three stages of high speed, middle speed and low speed, you need at least five hydraulic motors. , Two hydraulic motors are required.

Accordingly, an object of the present invention is to provide a speed switching device of a hydraulic rotating device capable of finely changing the speed in accordance with the number of motors to be used.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of hydraulic motors each rotating one shaft via a power transmission mechanism, and a hydraulic pressure supplying hydraulic oil to each hydraulic motor. A pump, a directional switching valve for switching a hydraulic oil supply direction from the hydraulic pump, and a hydraulic oil supply / discharge circuit for each hydraulic motor branched from a hydraulic oil supply / discharge circuit of the directional switch valve to connect each hydraulic motor in parallel. And a hydraulic circuit having at least one hydraulic oil supply / discharge circuit to each hydraulic motor branched from one of the hydraulic oil supply / discharge circuits of the direction switching valve. A switching valve is provided in each of the hydraulic oil supply / discharge circuits to the remaining hydraulic motors other than the supply / discharge circuit, and a bypass circuit branched from the other circuit of the hydraulic oil supply / discharge circuit of the direction switching valve is connected to the switch valve. The switching valve disconnects the communication between the hydraulic motor provided with the switching valve and the hydraulic pump, the communication between the hydraulic motor provided with the switching valve and the hydraulic pump, and the hydraulic oil supply / discharge circuit of the hydraulic motor. It is possible to switch to a working oil circulation state that is short-circuited via a bypass circuit, wherein the bypass circuit is provided with the switching valve branched from the other circuit of the working oil supply / discharge circuit of the direction switching valve. It is preferable to branch on the hydraulic pump side from the branch point of the hydraulic oil supply / discharge circuit to the hydraulic motor that is not connected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a hydraulic rotating device of a tubing device will be described below with reference to FIGS. The tubing device 10 is shown in FIG.
As shown in FIG. 3, a plurality of thrust cylinders 12 erected on a base frame 11 support an elevating frame 13 so as to be able to move up and down.
And a chuck device 15.

The hydraulic rotating device 14 includes a ring-shaped rotating body 16 rotatably provided on the lifting frame 13 and two hydraulic motors 17, 18 (1) for rotating the rotating body 16.
The table is not shown), and each hydraulic motor 17, 18
Power is transmitted to a pinion 19 provided on the output shaft and a ring gear 16 a formed on the outer periphery of the rotating body 16 via an idler 20. The rotating body 16 has a casing tube 2
One insertion hole 22 is formed.

The chuck device 15 includes a plurality of chuck cylinders 23 provided on the lifting frame 13, a ring-shaped support frame 24 supported by the chuck cylinder 23,
It has a ring-shaped chuck frame 25 rotatably provided on the support frame 24, and a wedge-shaped chuck member 26 suspended from the chuck frame 25.

The tubing device 10 includes a rotating body 16
The casing tube 21 inserted through the insertion hole 22 is gripped by the lowering of the chuck member 26 due to the contraction of the chuck cylinder 23, and the rotating body 16 is driven to rotate by the hydraulic motors 17 and 18 to rotate the casing tube 21 while thrusting. The lifting frame 13 is raised and lowered by the cylinder 12 to push and pull the casing tube 21.

The hydraulic circuit of the hydraulic rotating device 14 is shown in FIG.
As shown in the figure, two variable displacement hydraulic motors 1
7, 18; a tank 27 for storing hydraulic oil; a variable displacement hydraulic pump 28 for supplying hydraulic oil from the tank 27 to each of the hydraulic motors 17 and 18; It has a direction switching valve 29 for switching the hydraulic oil supply direction, and a filter 30 provided in a hydraulic oil discharge circuit from the direction switch valve 29 to the tank 27. The hydraulic oil supply / discharge circuits 17a, 17b of the motor 17 and the hydraulic oil supply / discharge circuits 18a, 18b of the hydraulic motor 18 are branched. The hydraulic motors 17 and 18 include the hydraulic motor 1
A drain circuit 32 for returning the leaked oil of 7 and 18 to the tank 27
Is connected.

A switching valve 33 is provided in the hydraulic oil supply / discharge circuit 18a of the hydraulic motor 18 branched from the hydraulic oil supply / discharge circuit 31a, and the switching valve 33 has a bypass circuit 34 branched from the hydraulic oil supply / discharge circuit 30b. Is connected. The bypass circuit 34 is branched on the hydraulic pump 28 side from a branch point of the hydraulic oil supply / discharge circuit 17b of the hydraulic motor 17 branched from the hydraulic oil supply / discharge circuit 31b.

When the switching valve 33 shown in FIG. 1 is in the state of the hydraulic rotation device 14, the hydraulic pump 28 and the hydraulic motor 1
8, the hydraulic oil supply / discharge circuit 18a communicates with the bypass circuit 3
4 is shut off, so that the hydraulic motors 17 and 18
Means that the rotating body 16 is rotated by the hydraulic oil supplied from the hydraulic pump 28 and rotationally driven.

Next, as shown in FIGS. 2 and 3, when the switching valve 33 is switched, the communication between the hydraulic pump 28 and the hydraulic oil supply / discharge circuit 18a of the hydraulic motor 18 is cut off, and the operation of the hydraulic motor 18 is started. The oil supply / discharge circuit 18a is short-circuited with the hydraulic oil supply / discharge circuit 18b via the bypass circuit 34. As a result, in the normal rotation state shown in FIG. 2, hydraulic oil is supplied from the hydraulic pump 28 to the hydraulic motor 17 via the hydraulic oil supply / discharge circuit 31a and the hydraulic oil supply / discharge circuit 17a.
To rotate the hydraulic oil supply / discharge circuit 3
1b, and is discharged to the tank 27.
Supply of hydraulic oil to the rotary body 16 is interrupted, so that only the hydraulic motor 17 rotates with hydraulic oil from the hydraulic pump 28,
Rotates forward. The hydraulic motor 18 rotates via the rotating body 16, and the hydraulic oil discharged from the hydraulic motor 18 is supplied from the hydraulic oil supply / discharge circuit 18 b to the switching valve 3 via the bypass circuit 34.
3 to the hydraulic oil supply / discharge circuit 18a and the hydraulic motor 18
Circulates.

Similarly, in the reverse rotation state shown in FIG. 3, hydraulic oil is supplied from the hydraulic pump 28 to the hydraulic motor 17 via the hydraulic oil supply / discharge circuit 31b and the hydraulic oil supply / discharge circuit 17b. To rotate the hydraulic oil supply / discharge circuit 17a
Is discharged to the tank 27 via the hydraulic oil supply / discharge circuit 31a. However, since the hydraulic motor 18 forms a circulation circuit with the hydraulic oil supply / discharge circuit 18a, the switching valve 33, the bypass circuit 34, and the hydraulic oil supply / discharge circuit 18b. The hydraulic oil from the hydraulic pump 28 is not directly supplied to the hydraulic motor 18, and the rotating body 16 is rotated reversely by the hydraulic motor 17.

Therefore, in the state shown in FIGS. 2 and 3, the hydraulic motor 17 is, as shown in FIG.
8, the rotating body 16 rotates at twice the speed of when the rotating body 16 is rotationally driven.

In the forward rotation, the hydraulic oil circulating in the hydraulic motor 18 mixes with the hydraulic oil returning from the hydraulic motor 17 to the tank 27 while flowing in the bypass circuit 34 from the hydraulic oil supply / discharge circuit 18b, and rotates in the reverse direction. Then, while the hydraulic pump 28 is flowing from the bypass circuit 34 to the hydraulic oil supply / discharge circuit 18b,
The hydraulic oil is mixed with the hydraulic oil supplied to the hydraulic motor 17, and a part of the hydraulic oil is exchanged with the hydraulic oil that has passed through the filter 29. Therefore, damage to the motor due to oil deterioration, dust, and the like can be reduced.

FIG. 5 shows a second example using three hydraulic motors.
FIG. 4 shows a hydraulic rotating device according to an embodiment, and in the following embodiments, the same elements as those in the first embodiment will be denoted by the same reference numerals. The hydraulic oil supply / discharge circuits 17a, 17b of the hydraulic motor 17, the hydraulic oil supply / discharge circuits 18a, 18b of the hydraulic motor 18, and the hydraulic oil of the hydraulic motor 40 are provided from the hydraulic oil supply / discharge circuits 31a, 31b of the direction switching valve 29. The supply / discharge circuits 40a and 40b are branched. In the hydraulic oil supply / discharge circuit 18a of the hydraulic motor 18, a switching valve 33 is provided on the hydraulic motor 18 side from a branch point with the hydraulic oil supply / discharge circuit 31a,
The switching valve 33 is also provided on the hydraulic oil supply / discharge circuit 40a of the hydraulic motor 40 on the hydraulic motor 40 side from the branch point with the hydraulic oil supply / discharge circuit 31a. Each of the switching valves 33 is connected to a bypass circuit 34 branched from the hydraulic oil supply / discharge circuit 31b on the hydraulic pump 28 side of a branch point of the hydraulic oil supply / discharge circuit 17b.

In this configuration, the switching valve 3 of the hydraulic motor 40
3, the communication between the hydraulic pump 28 and the hydraulic oil supply / discharge circuit 40a of the hydraulic motor 40 is cut off, and the hydraulic oil supply / discharge circuit 40a of the hydraulic motor 40
And the bypass circuit 34 are short-circuited, the hydraulic oil supplied from the hydraulic pump 28 is supplied to the hydraulic motors 17, 18, and the hydraulic motor 40 is driven to rotate via the rotating body 16 and is discharged from the hydraulic motor 40. Oil is supplied to the hydraulic oil supply / discharge circuit 40
b flows through the switching valve 33 via the bypass circuit 34 to the hydraulic oil supply / discharge circuit 40 a and circulates to the hydraulic motor 40.
Therefore, the hydraulic motors 17 and 18 rotate at a speed 1.5 times faster than when the rotating body 16 is rotationally driven by the three hydraulic motors 17, 18 and 40. The same applies to switching of the switching valve 33 of the hydraulic motor 18 without switching the switching valve 33 of the hydraulic motor 40. When both the switching valve 33 of the hydraulic motor 18 and the switching valve 33 of the hydraulic motor 40 are switched, the hydraulic oil supplied from the hydraulic pump 28 is supplied only to the hydraulic motor 17, and the hydraulic motor 17 , 18, and 40, the rotating body 16 rotates at a speed three times faster than when the rotating body 16 is rotationally driven.

FIG. 6 shows a third embodiment using three hydraulic motors.
1 shows a hydraulic rotation device according to an embodiment, and shows a directional control valve 2;
The hydraulic motor 18 branched from the hydraulic oil supply / discharge circuit 31a of FIG.
The switching valve 33 of the hydraulic oil supply / discharge circuit 18a is provided closer to the hydraulic pump 28 than the branch point between the hydraulic oil supply / discharge circuit 31a and the hydraulic oil supply / discharge circuit 18a. It is connected. The hydraulic motor 40 is provided with a switching valve 33 in the middle of the hydraulic oil supply / discharge circuit 40a, and the bypass circuit 34 is connected to the switching valve 33.

In this configuration, the switching valve 3 of the hydraulic motor 40
When the number 3 is switched, the communication between the hydraulic pump 28 and the hydraulic oil supply / discharge circuit 40a of the hydraulic motor 40 is cut off, and the hydraulic oil of the hydraulic motor 40 is circulated. The motors 17, 18 are supplied to the hydraulic motors 17, 18.
The rotating body 16 is rotated at a speed 1.5 times faster than when the rotating body 16 is rotationally driven at 18, 40. When the switching valve 33 of the hydraulic motor 18 is switched, the communication between the hydraulic pump 28 and the hydraulic motors 18 and 40 is cut off, and the hydraulic motors 18 and 40 are disconnected.
Hydraulic fluid circulates, the hydraulic motor 17
The rotating body 16 rotates at a speed three times faster than when the rotating body 16 is driven to rotate by the original hydraulic motors 17, 18, and 40.

FIG. 7 shows a fourth hydraulic motor using three hydraulic motors.
This embodiment shows a hydraulic rotating device. In the present embodiment, a switching valve 33 is provided only in the hydraulic motor 18 and the bypass circuit 34 is connected to the switching valve 33. 33, the hydraulic motor 17,
Numeral 40 designates three hydraulic motors 17, 18, and 40,
6 rotates at a speed 1.5 times faster than when it was driven to rotate.

In the case where four or more hydraulic motors are used, by adopting a similar configuration, it is possible to switch the speed for the maximum number of motors to be used. As described above, the switching valve 33 is added to the conventional hydraulic circuit, and fine speed switching can be performed with a simple and inexpensive structure in which the hydraulic oil supply / discharge circuit is slightly changed.

The hydraulic motor to be used may be a fixed displacement motor, but if a variable displacement hydraulic motor is used as in the above embodiment, a wider range of speed switching is possible.
Furthermore, the bypass circuit may be on the branch point side of the hydraulic oil supply / discharge circuit of the hydraulic motor provided with the switching valve from the branch point of the hydraulic oil supply / discharge circuit of the hydraulic motor not provided with the switching valve. Also,
In the above embodiment, the present invention is described as applied to a hydraulic rotating device of a tubing device. However, the present invention is not limited to this, and is applicable to a hydraulic rotating device such as a hydraulic auger having a similar configuration. .

[0025]

As described above, the speed switching device of the hydraulic rotating device according to the present invention is one of the hydraulic oil supply / discharge circuits of the direction switching valve in which a plurality of hydraulic motors for rotating one shaft are connected in parallel. A switching valve is provided in each of the hydraulic oil supply / discharge circuits to the remaining hydraulic motors other than the hydraulic oil supply / discharge circuit to at least one hydraulic motor among the hydraulic oil supply / discharge circuits to each hydraulic motor branched from Connected to a bypass circuit branched from the other circuit of the hydraulic oil supply / discharge circuit of the direction switching valve, the switching valve being connected to a hydraulic motor provided with the switching valve and the hydraulic pump, and a hydraulic motor provided with the switching valve. Communication between the hydraulic pump and the hydraulic pump can be switched to a hydraulic oil circulation state in which the hydraulic oil supply / discharge circuit of the hydraulic motor is short-circuited via a bypass circuit. hydraulic oil The hydraulic fluid supplied to the hydraulic motor not provided with the switching valve and the hydraulic motor not switched is circulated through the bypass circuit, and the switched hydraulic motor is directly Since hydraulic oil is not supplied from the hydraulic pump, the hydraulic motor without a switching valve and the hydraulic motor that is not switched are faster than when they are rotated by the number of hydraulic motors including the switched hydraulic motor. Rotate with. Therefore, the speed can be switched by the number of motors used at the maximum, and a switching valve can be added to the conventional hydraulic circuit, and a simple and inexpensive structure with only a small change in the hydraulic oil supply / discharge circuit can be used to perform fine speed switching. . Further, by branching the bypass circuit on the hydraulic pump side from a hydraulic oil supply / discharge circuit branch point to a hydraulic motor that does not have a switching valve that branches from the other circuit of the hydraulic oil supply / discharge circuit of the direction switching valve, Hydraulic oil circulating through the switched hydraulic motor flows from the hydraulic oil supply / discharge circuit to the bypass circuit, and does not have a switching valve. Since the hydraulic fluid is mixed with the hydraulic oil supplied to the hydraulic motor and partially replaced with the hydraulic oil that has passed through the filter, damage to the motor due to oil deterioration, dust, and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a hydraulic rotating device showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a state where a hydraulic motor without a switching valve is rotated at a high speed in a forward direction.

FIG. 3 is a circuit diagram showing a state in which a hydraulic motor without a switching valve is reversely rotated at a high speed.

FIG. 4 is a sectional view of a tubing device.

FIG. 5 is a circuit diagram of a hydraulic rotating device showing a second embodiment.

FIG. 6 is a circuit diagram of a hydraulic rotating device showing a third embodiment.

FIG. 7 is a circuit diagram of a hydraulic rotating device showing a fourth embodiment.

FIG. 8 is a circuit diagram of a conventional hydraulic rotating device.

[Explanation of symbols]

10 tubing device, 16 rotator, 17, 18,
40 ... hydraulic motor, 17a, 17b, 18a, 18b,
40a, 40b ... hydraulic oil supply / discharge circuit of hydraulic motor, 19 ...
Pinion, 28 ... hydraulic pump, 29 ... directional switching valve, 31
a, 31b: hydraulic oil supply / discharge circuit for directional switching valve, 33: switching valve, 34: bypass circuit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinji Kurimoto 1-1-1, Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi F-term in Japan Vehicle Manufacturing Co., Ltd. 2D050 AA06 CB02 CB22 CB23 EE04 FF02 3H089 AA32 AA74 BB17 BB27 CC09 CC10 CC12 DA03 DB46 DB49 DB55 DB75 EE16 GG02 JJ01

Claims (2)

[Claims] 1. A plurality of hydraulic motors each rotating one shaft via a power transmission mechanism, a hydraulic pump for supplying hydraulic oil to each hydraulic motor, and a direction switch for switching a hydraulic oil supply direction from the hydraulic pump. In a hydraulic rotating device having a valve and a hydraulic circuit for branching a hydraulic oil supply / discharge circuit of each hydraulic motor from a hydraulic oil supply / discharge circuit of the direction switching valve and connecting each hydraulic motor in parallel, Of the hydraulic oil supply / discharge circuits to each hydraulic motor branched from one of the hydraulic oil supply / discharge circuits, a hydraulic oil supply / discharge circuit to the remaining hydraulic motors other than the hydraulic oil supply / discharge circuit to at least one hydraulic motor And a bypass circuit branched from the other circuit of the hydraulic oil supply / discharge circuit of the direction switching valve is connected to the switching valve, and the switching valve is connected to a hydraulic motor provided with the switching valve and the hydraulic pressure. Pong Can be switched between a communication state with the hydraulic pump and a hydraulic oil circulation state in which communication between the hydraulic motor provided with the switching valve and the hydraulic pump is cut off and the hydraulic oil supply / discharge circuit of the hydraulic motor is short-circuited via a bypass circuit. A speed switching device for a hydraulic rotating device. 2. The hydraulic pump according to claim 1, wherein the bypass circuit is located at a position closer to a hydraulic oil supply / discharge circuit branch point than a hydraulic oil supply / discharge circuit to a hydraulic motor not provided with the switching valve which branches from the other circuit of the hydraulic oil supply / discharge circuit of the direction switching valve. 2. The speed switching device for a hydraulic rotating device according to claim 1, wherein the branching is performed on the side.