JPH0712741Y2 - Hydraulic fixed joint - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed joint fixed to a rotary shaft by the pressure of liquid, and more particularly to a hydraulic circuit provided integrally with the joint body for supplying and discharging hydraulic fluid, and this hydraulic pressure. The present invention relates to a hydraulic fixed joint including means for supplying electric power to a circuit from the outside.

[0002]

2. Description of the Related Art FIG. 3 is a side sectional view showing an example of a conventional hydraulic fixed joint, and FIG. 4 is an explanatory view of the operation of the hydraulic fixed joint shown in FIG.

Reference numeral 1 is a main body portion, 2 is a fitting hole which is formed in the main body portion 1 in the axial direction, and which is open at one end face, and 3 is a fitting hole 2
The hydraulic chamber 4 formed in an annular shape along the inner peripheral surface 2a of the shaft 4 is a cover fixed to the rotary shaft 51, and 5 is a flange to which another flange 52a welded to the rotary shaft 52 is fixed by bolts or the like. is there.

A shear tube 6 is inserted into the main body 1 from the outer peripheral surface thereof. One end of the shear tube 6 communicates with the hydraulic chamber 3 and the other end of the shear tube 6 is sealed by a lid 6a. The hole 6b is provided, and the lid 6a is formed in a shape protruding from the outer peripheral surface of the main body 1 and easily sheared by a force in a direction along the outer peripheral surface. A U-shaped cutout portion 4a is formed in the cover 4, and the main body portion 1 is adjusted in phase so that the cutout portion 4a is the center of the lid portion 6a of the shear tube 6 in the circumferential direction.

As shown in FIG. 4, the main body 1 has a hydraulic chamber 3
An oil passage 7b communicating with the oil injection port 8 is formed, and an oil injection nipple 9 is screwed into the oil injection port 8. The oil-filling nipple 9 has a hemispherical tip end, and an oil-filling passage 9 that opens at a gap formed between the oil-filling port 8 and the rear end part
equipped with a. By sufficiently tightening the oil supply nipple 9, the tip end is pressed against the opening of the oil passage 7b to seal and loosen the oil passage 7b.
And the oil passage 7b communicate with each other.

Connect a hydraulic hose 53 to the lubrication nipple 9,
By filling the hydraulic chamber 3 with high-pressure hydraulic fluid as hydraulic fluid by an oil pump (not shown), the partition wall 10 formed between the inner peripheral surface 2a and the hydraulic chamber 3 is indicated by a chain double-dashed line. Swells radially. At this time, by sufficiently tightening the oil supply nipple 9, high-pressure hydraulic oil is sealed in the hydraulic chamber 3 and the partition wall 10 is maintained in a bulged state.

When the rotary shaft 51 is inserted into the fitting hole 2 as shown in FIG. 3, the partition wall 10 swells by hydraulic pressure, so that the inner peripheral surface 2a is pressed against the outer peripheral surface 51a of the rotary shaft 51. Generate a frictional force corresponding to the pressure of the hydraulic oil between the outer peripheral surface 51a.

The rotary shaft 52 is connected to a drive mechanism (not shown) and transmits the torque of the drive mechanism to the main body 1. The main body 1 transmits the torque of the drive mechanism to the rotating shaft 51 by the frictional force. Here, when the torque transmitted from the rotary shaft 52 to the main body 1 becomes larger than the allowable torque, the main body 1
The inner peripheral surface 2a slides on the outer peripheral surface 51a of the rotating shaft 51 against the frictional force corresponding to the pressure of the hydraulic oil, so that the phase with respect to the rotating shaft 51 changes.

When the phase of the main body 1 with respect to the rotating shaft 51 changes, the notch 4a of the cover 4 shears the lid 6a of the shear tube 6, the end of the outflow hole 6b is opened, and the outflow hole 6b.
The high-pressure hydraulic oil in the hydraulic chamber 3 flows out from. When the high-pressure hydraulic oil flows out from the hydraulic chamber 3, the partition wall 10 is restored to a flat shape and the frictional force generated by the hydraulic pressure between the inner peripheral surface 2a and the outer peripheral surface 51a of the rotating shaft 51 disappears. Let At this time, the main body part 1 idles with respect to the rotating shaft 51 to interrupt the transmission of torque.

When the torque larger than the permissible torque is transmitted, the main body 1 is idled to interrupt the transmission of the torque, so that it is possible to prevent overload from occurring in the rotary shafts 51 and 52, a drive mechanism (not shown), or the like. .

[0011]

However, in the above hydraulic fixed joint, when the torque transmission is interrupted, the lid portion 6a of the shear tube 6 is sheared and the working oil flows out. The hydraulic oil that has leaked to the outside may contaminate the vicinity of the device, and the lid 6a may be sandwiched between gears or the like, which may cause a failure of the external device.

To set the hydraulic fixed joint on the rotary shaft 51 again, replace the shear tube 6 with a new one.
After replenishing the hydraulic oil that has flowed out, connecting the hydraulic hose 53, and further filling the hydraulic chamber 3 with high-pressure hydraulic oil, the hydraulic hose 53
Since it has to be removed, the running cost is high and the setting work is complicated.

An object of the present invention is to provide a hydraulic fixed joint in which external contamination due to hydraulic fluid is prevented, fixing work to a rotary shaft is easy, and running costs can be reduced.

[0014]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by providing a substantially cylindrical main body, a fitting hole formed in the main body, into which a rotary shaft is inserted, and the fitting hole. An annular hydraulic chamber formed in the body along the inner peripheral surface of the hole, and between the hydraulic chamber and the inner peripheral surface of the fitting hole, high-pressure hydraulic fluid is formed in the hydraulic chamber. In a hydraulic pressure fixed joint provided with a partition wall that bulges when filled and presses the inner peripheral surface of the fitting hole against the rotary shaft, a substantially cylindrical hydraulic unit accommodating portion integrally provided with the main body portion, , A hydraulic circuit which is arranged in the hydraulic unit accommodating portion and which drives a pump to supply a high-pressure hydraulic fluid from a tank to a hydraulic pressure chamber, and a pair of slips fixed on the outer peripheral surface of the hydraulic unit accommodating portion. A ring, a pair of brushes in contact with the slip ring and connected to an external power source, and the slip Ring is connected with the hydraulic unit housing portion to, wherein said further comprising: a power supply section for supplying a driving current from an external power source to the pump.

Further, a hydraulic pressure sensor for detecting the pressure of the hydraulic fluid in the hydraulic chamber and outputting a pressure detection signal, and the supply of the drive current to the pump at a set pressure upon receiving the pressure detection signal is stopped, And a controller for sealing the hydraulic circuit so that the pressure of the hydraulic fluid filled in the hydraulic chamber is maintained.

Furthermore, when the hydraulic chamber is filled with a high-pressure hydraulic fluid, a phase change detecting means for detecting a phase change of the main body with respect to the rotary shaft and outputting a phase change detection signal is provided. The control unit receives the phase change detection signal and connects the hydraulic chamber and the tank by a hydraulic circuit.

[0017]

According to the above-mentioned means, a drive current is externally supplied to the pump of the hydraulic circuit by the hydraulic circuit and the slip ring arranged in the hydraulic unit accommodating portion, and the brush in contact with the slip ring. In addition, high-pressure hydraulic fluid is supplied to the hydraulic chamber when the drive current is supplied.

Further, receiving the hydraulic pressure sensor and the pressure detection signal, the supply of the drive current to the pump is stopped at the set pressure,
In addition, since the pressure of the hydraulic fluid in the hydraulic chamber is maintained without consuming the drive current by the control unit that seals the hydraulic circuit, the fastening state of the main body with respect to the rotating shaft is maintained.

Further, by the position change detecting means and the control unit which receives the phase change detecting signal and connects the hydraulic chamber and the tank by the hydraulic circuit, a high pressure is generated from the hydraulic chamber when the phase of the main body changes with respect to the rotating shaft. The hydraulic fluid flows out to the tank, and the main body interrupts the torque transmission.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the member corresponding to the member demonstrated based on FIG. 3 or FIG. 4 in FIG. 1 or 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 1 is a block diagram showing an embodiment of a hydraulic fixed joint of the present invention.

The main body 1 and the rotary shaft 52 are connected to each other via the hydraulic unit storage portion 20, and the hydraulic unit storage portion 20 is connected.
Is formed in a substantially cylindrical shape, and has a flange 5 and a flange on both ends.
Flange 20a, 20b fixed to 52a is formed.

In the hydraulic unit accommodating section 20, 21 is a pair of slip rings fixed to the outer peripheral surface via an insulating ring 22, 30 is a power supply / control section, 40 is a hydraulic circuit unit, 41 is an integral unit with an oil tank 42. It is an oil pump formed in. A pair of brushes 23 supported by a supporting member (not shown) are in contact with the pair of slip rings 21, and the brushes 23 and the slip rings 21 maintain a contact state even when the hydraulic unit storage section 20 rotates, and power supply / control is performed. A current can be supplied to the unit 30 from an external power supply 25.

An oil passage 7c communicating with the hydraulic chamber 3 is formed in the main body 1, and the oil passage 7c is connected to a pipe 43a of the hydraulic circuit unit 40 by a coupler 44. Further, a reflection type photoelectric switch 31 is fixed to the outer peripheral surface of the main body 1, and a support member 33 for supporting the reflection plate 32 is fitted to the rotating shaft 51 at a position facing the photoelectric switch 31. The photoelectric switch 31 is
When the reflection plate 32 moves to the non-opposing position, a phase change detection signal is output to the power supply / control unit 30.

FIG. 2 is a block diagram showing the power supply / control unit and hydraulic circuit of this embodiment.

In the hydraulic circuit unit 40, 45 is a pipe 43
When the pressure of the hydraulic oil in b exceeds the upper limit value of the set pressure, a relief valve that allows the hydraulic oil to flow to the oil tank 42 through the pipe 43b, 46 is a 3-port electromagnetic switching valve, and 47 is the pipe 43a.
Is a pressure switch that detects when the pressure of the hydraulic oil reaches a set pressure and outputs a set pressure detection signal to the power supply / control unit 30.

The electromagnetic switching valve 46 is applied with an exciting current Io, which is a control signal, to communicate with the pipes 43a and 43b, or is applied with an exciting current Ir to communicate with the pipes 43a and 43d, or the current The pipe 43a is sealed when the voltage is not applied.

A method of fixing the hydraulic fixed joint to the rotary shaft 51 will be described.

The hydraulic chamber 3, the oil passage 7c and the pipe 43a are filled with low-pressure hydraulic oil in advance through an oil-filling nipple (not shown). At this time, since the exciting current is not applied to the electromagnetic switching valve 46 and the hydraulic oil has a low pressure, the partition wall
10 does not swell.

Next, by adjusting the phase of the rotary shaft 51 or the main body 1, the reflection plate 32 is positioned at the position facing the photoelectric switch 31, and the phase change detection signal is turned off.

Next, the power switch 25 is turned on to start supplying power to the power / control unit 30. At this time, the power supply / control unit 30 applies the exciting current Io to the electromagnetic switching valve 46 and the driving current to drive the oil pump 41. When the oil pump 41 is driven to discharge the hydraulic oil in the oil tank 42 from the supply port, the pressure of the hydraulic oil in the hydraulic chamber 3 is increased, and when the pressure reaches the set pressure, the pressure switch 47, which is a hydraulic sensor, , Outputs a set pressure detection signal to the power supply / control unit 30. In response to this signal, the power supply / control unit 30 turns off the excitation current Io and the drive current, and the electromagnetic switching valve 46 fills the hydraulic oil in the hydraulic chamber 3. By setting the set pressure sufficiently high and filling the hydraulic chamber 3 with the hydraulic oil having the set pressure, the partition wall 10 swells in the radial direction and presses the inner peripheral surface 2a against the outer peripheral surface 51a of the rotating shaft 51. , A frictional force corresponding to the pressure of the hydraulic oil is generated between the inner peripheral surface 2a and the outer peripheral surface 51a.

If the torque transmitted to the rotary shaft 51 becomes larger than the allowable torque set by the pressure of the hydraulic oil, the inner peripheral surface 2a of the main body 1 resists the frictional force and the rotary shaft 51 is rotated.
Since it slides on the outer peripheral surface 51a, the phase with respect to the rotating shaft 51 changes. At this time, the photoelectric switch 31 moves to the non-opposing position of the reflection plate 32 and outputs a phase change detection signal to the power supply / control unit 30.

Upon receiving the phase change detection signal, the power supply / control unit 30
Applies an exciting current Ir to the electromagnetic switching valve 46. The electromagnetic switching valve 46 applied to the exciting current Ir is connected to the piping 4 as described above.
The 3a and the pipe 43d are communicated with each other. As a result, the high-pressure hydraulic oil in the hydraulic chamber 3 flows out and is collected in the oil tank 42, and the partition wall 10 is restored to a flat shape, and the inner peripheral surface 2a of the main body 1 and the rotary shaft 51 are hydraulically operated. Since the frictional force generated between the outer peripheral surface 51a and the outer peripheral surface 51a is eliminated, the main body portion 1 idles and interrupts the torque transmission to the rotating shaft 51.

When fixing the hydraulic fixed joint to the rotary shaft 51 again, by turning off the power switch 25, the exciting current Ir is turned off and the hydraulic fixed joint is reset to the initial state.

As described above, according to the hydraulic fixed joint of the present embodiment, it is not necessary to connect a hydraulic hose or the like to supply hydraulic oil from the outside when fixing the main body 1 to the rotary shaft 51, and Since it is possible to supply high-pressure hydraulic oil to the hydraulic chamber 3 by remote operation, fixing work becomes easy, and since hydraulic oil and shear tubes do not scatter to the outside, it is possible to prevent the outside from being polluted. In addition, the consumable member is unnecessary, and the running cost can be reduced. Further, although the hydraulic oil is used to operate the hydraulic fixed joint in this embodiment, it is of course possible to replace it with another liquid.

[0036]

As described above, according to the present invention, the pump of the hydraulic circuit is formed by the hydraulic circuit and the slip ring arranged in the hydraulic unit housing and the brush in contact with the slip ring. Since the drive current is supplied from the outside and the high-pressure hydraulic fluid is supplied to the hydraulic chamber when the drive current is supplied, it is not necessary to connect a hydraulic hose etc. to supply the hydraulic fluid from the outside. On the other hand, the main body can be easily fixed, and the hydraulic pressure sensor and the control unit that stops the supply of the drive current to the pump at the set pressure and seals the hydraulic circuit allow the liquid to be supplied without consuming the drive current. Since the pressure of the hydraulic fluid in the pressure chamber is maintained, the fastening state of the main body with respect to the rotating shaft can be maintained, and the phase change detection means and the hydraulic circuit receiving the phase change detection signal can separate the hydraulic chamber and the tank. Connected With the control unit, the high-pressure hydraulic fluid flows out of the hydraulic chamber to the tank when the phase of the main body changes with respect to the rotating shaft, so the hydraulic fluid can be prevented from flowing out and the hydraulic fluid can be reused. The running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a hydraulic fixed joint of the present invention.

FIG. 2 is a configuration diagram showing a power supply / control unit and a hydraulic circuit of the present embodiment.

FIG. 3 is a side sectional view showing an example of a conventional hydraulic fixed joint.

FIG. 4 is an explanatory view of the operation of the hydraulic fixed joint shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body part, 2 ... Fitting hole, 2a ... Inner peripheral surface, 3 ... Hydraulic chamber, 10 ... Partition, 20 ... Hydraulic unit storage part, 21 ... Slip ring, 23 ... Brush, 24 ... External power supply, 30 ...
Power supply / control unit, 31 ... Photoelectric switch, 32 ... Reflector,
40 ... Hydraulic circuit unit, 41 ... Oil pump, 42 ... Oil tank, 46 ... Electromagnetic switching valve, 51 ... Rotating shaft.

Front page continued (72) Inventor Yukio Hashimoto 3-10-10 Tsukiji, Chuo-ku, Tokyo Nakamura Jiko Co., Ltd. (72) Inventor Koshiba Miyabiko 3-10-10 Tsukiji, Chuo-ku, Tokyo Shares Company Nakamura In-house (72) Inventor Ko Muroyama 3-10-10 Tsukiji, Chuo-ku, Tokyo Stock Company Nakamura In-house (72) Inventor Mikiya Nose 3-10-10 Tsukiji, Chuo-ku, Tokyo Share Company Nakamura In-house (72) Inventor Kazuhiko Usami 3-10-10 Tsukiji, Chuo-ku, Tokyo Stock Company Nakamura In-house (72) In-house Koji Izumi 3-10-10 Tsukiji, Chuo-ku, Tokyo Shares Company Nakamura self-engineering

Claims (3)

[Scope of utility model registration request] 1. A body having a substantially cylindrical shape, a fitting hole formed in the body, into which a rotary shaft is inserted, and an annular body formed in the body along the inner peripheral surface of the fitting hole. A hydraulic chamber is formed between the hydraulic chamber and the inner peripheral surface of the fitting hole. When the hydraulic chamber is filled with high-pressure hydraulic fluid, it bulges to rotate the inner peripheral surface of the fitting hole. In a hydraulic fixed joint equipped with a partition to be crimped onto a shaft, a substantially cylindrical hydraulic unit accommodating portion integrally provided with the main body portion and a hydraulic unit accommodating portion arranged in the hydraulic unit accommodating portion to drive a pump. A hydraulic circuit for supplying high-pressure hydraulic fluid from the tank to the hydraulic chamber, a pair of slip rings fixed on the outer peripheral surface of the hydraulic unit housing portion, and a pair that are in contact with the slip rings and are connected to an external power source. Connected to the brush and the slip ring in the hydraulic unit A hydraulic fixed joint, comprising: a power supply unit that supplies a drive current from an external power supply. 2. A hydraulic pressure sensor that detects the pressure of hydraulic fluid in the hydraulic chamber and outputs a pressure detection signal, and stops the supply of the drive current to the pump at a set pressure upon receiving the pressure detection signal. The hydraulic fixed joint according to claim 1, further comprising: a controller that seals the hydraulic circuit so that the pressure of the hydraulic fluid filled in the hydraulic chamber is maintained. 3. A phase change detection means for detecting a phase change of the main body with respect to the rotary shaft and outputting a phase change detection signal when the hydraulic chamber is filled with a high-pressure hydraulic fluid. 3. The hydraulic fixed joint according to claim 2, wherein the control unit receives the phase change detection signal, and connects the hydraulic chamber and the tank by a hydraulic circuit.