JP2002156026A - Rotation transmitting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation transmitting mechanism capable of facilitating fitting of a pulley to a rotating shaft and making fine adjustment of a pulley fixing position to the rotating shaft. SOLUTION: This rotation transmitting mechanism has the rotating shaft 5 to which turning force from a rotation driving source is transmitted, the pulley 1 engagingly fitted to the rotating shaft 5, a dish-like hold spring 4 engaged with an annular recessed part 19 formed on the other side surface of the pulley 1 and engaged with the rotating shaft 5, and a fixing nut 2 engaged with a screw 15 mounted on the rotating shaft 5 so that the outer peripheral surface 20 is loosely fitted to the annular recessed part 19. The hold spring 4 is pressed in the axial direction by screw-in of the fixing nut to the rotating shaft 5 to enlarge the outside diameter of the outer peripheral surface 20 so that the hold spring is deformed. Thus, the outer peripheral surface 20 of the hold spring 4 is pressed to be locked in the annular recessed part 19 of the pulley 1 to thereby fix the pulley 1 to the rotating shaft 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission structure of a rotation transmission system of a rotary shaft for actuating a switch mechanism used in, for example, a valve drive actuator and a scale plate for a pointer indicating a valve opening.

[0002]

2. Description of the Related Art Conventionally, gates, sluices, and the like provided in a flow path of a fluid such as a water channel, a water purification plant, and a power plant are provided with valves for opening and closing the flow path to control the flow rate. A valve driving actuator is used to operate a valve provided in the flow path. Valve actuating actuators for actuating valves are moving toward centralized information systems that are controlled using controllers. Recently, it has been known that a valve driving actuator is provided with a controller capable of performing a simple partial control of the valve opening / closing control without performing all control of the valve opening / closing by a host computer. .

[0003] As the valve driving actuator, for example, one disclosed in Japanese Patent Application Laid-Open No. H11-107254 is known. The valve drive actuator transmits a rotation transmitted from the spindle to an input-side rotary shaft and controls the output-side rotary shaft connected to the input-side rotary shaft to control opening and closing of the valve. A switch cam for operating an actuating limit switch, a torque switch, and the like, a scale plate indicating a valve opening degree, and the like are provided.
A plurality of switch cams are provided on the output rotary shaft, and limit switches, torque switches, etc. are operated in accordance with the rotation angle of the output rotary shaft provided with the cams, and a detection signal of the valve operating state is obtained. The operation of the valve driving actuator can be controlled in response to the detection signal.
In order to be able to adjust the operation timing and the like of each actuator for each valve drive device, each switch cam is structured so that the mounting position on the output side rotating shaft can be adjusted manually. I have.

The input-side rotary shaft is provided as a part of a drive actuator, and the output-side rotary shaft is provided as a part of a switch unit in relation to a limit switch cam. In such a case, a potentiometer provided in connection with the input-side rotary shaft for electrically detecting the rotational position of the input-side rotary shaft, and a switch-operated limit switch cam provided in connection with the output-side rotary shaft. It is difficult to adjust the phase between the actuator and the actuator, but the controlled member such as the valve should be controlled according to the amount of operation of the actuator, but it cannot be controlled accurately based on the amount of rotation of the output side rotation shaft . In addition, it is difficult for even a skilled worker to attach the input-side rotary shaft and the output-side rotary shaft, which are one part of the unitized switch unit, to each other without looseness.

[0005]

Incidentally, in a rotary drive system for operating the switch unit, a gear transmission mechanism is generally incorporated. However, when a gear of the gear transmission mechanism is mounted on a rotary shaft, the gear drive mechanism is mounted on the rotary shaft. Requires that the gears be set with high precision with respect to the rotating shaft in consideration of the meshing state of the gears and the like. In addition, to obtain information such as the degree of rotation in the switch unit, it is necessary to accurately detect the information such as the degree of rotation in the gear transmission mechanism, when the backlash of the gears is taken into account. However, it was not always possible to accurately detect information such as the valve opening degree.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to use a pulley in place of a conventional gear, to facilitate attachment of the pulley to a rotating shaft,
In addition, it eliminates errors due to backlash, such as those caused by gear transmission using a toothed belt as a pulley, and detects the degree of rotation with high accuracy, and displays not only the pointer and the scale plate, but also to the central information system. An object of the present invention is to provide a rotation transmission structure capable of transmitting a signal value of a transmitting potentiometer with high accuracy.

The present invention provides a rotary shaft rotatably supported by a frame and transmitting a rotational force from a rotary drive source, a stopper provided on the rotary shaft, one side surface of which is locked and fitted to the rotary shaft. A first pulley movably attached to the first pulley, a dish-shaped hold spring fitted to an annular recess formed on the other side surface of the first pulley and fitted to the rotary shaft, and a screw provided on the rotary shaft. And a fixing nut whose outer peripheral surface can be loosely fitted into the annular concave portion by being screwed into the outer peripheral surface. And an outer peripheral surface of the hold spring presses and locks the annular concave portion of the first pulley to fix the first pulley to the rotation shaft.

In this rotation transmitting structure, a scale plate for displaying an opening degree is provided at one end of the rotation shaft.

In this rotation transmitting structure, a first tooth formed on the outer peripheral surface of the first pulley, a toothed belt having second teeth meshing with the first tooth, and the second teeth of the toothed belt mesh with each other. A second pulley having third teeth; and a driven shaft fixed to the second pulley.

In this rotation transmission structure, the driven shaft is applied to actuate a potentiometer provided in a transmitter for indicating a valve opening.

In this rotation transmitting structure, the toothed belt can operate the plurality of driven shafts by meshing with the plurality of second pulleys.

Since the rotation transmitting structure is configured as described above, it is extremely easy to attach and remove the pulley to and from the rotary shaft, and the position of the pulley with respect to the rotary shaft can be extremely easily adjusted by slightly loosening the nut. Can be fine-tuned.

Further, in this rotation transmitting structure, by using a toothed belt for transmitting the rotation between the rotating shafts, the center of the rotating shafts can be freely set, and furthermore, the rotation transmission structure is generated by gears. Backlash can be reduced, the degree of rotation of the input-side rotary shaft can be transmitted to a driven shaft such as a potentiometer with high precision, and information can be transmitted with high precision. Also,
By using a toothed belt, a plurality of rotary shafts can be transmitted, for example, a plurality of potentiometers can be operated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rotation transmitting structure according to the present invention will be described with reference to the accompanying drawings. 1 is a front view showing an embodiment of the rotation transmitting structure according to the present invention, FIG. 2 is a side view showing an embodiment of the rotation transmitting structure of FIG. 1, and FIG. 3 is another embodiment of the rotation transmitting structure of FIG. It is a side view which shows an example.

This rotation transmission structure is used, for example, in a valve drive actuator provided with a rotation transmission device for rotationally driving a valve such as a gate and a water gate in a flow path of a water channel, a water purification plant or the like. And a potentiometer 8 incorporated in an output-side rotary shaft 5 driven by an input-side rotary shaft to which rotation from a drive source such as a motor or a manual is transmitted. , 24 and the degree of rotation of the scale plate 6 indicating the degree of opening of the valve. In this embodiment, the scale plate 6 is rotated, and the degree of rotation of the scale plate 6 is detected by a pointer fixed to the housing 22 so that the valve opening can be visually checked. Further, this rotation transmission structure is housed in the housing 22, and can be easily applied to an existing switch unit. The switch unit is configured as a unit that can be handled collectively so that the switch unit can be easily attached to and detached from the housing 22 for inspection and repair. The rotation shaft 5 is rotatable with respect to the frame 10 but is supported so as to be restricted in the axial direction.

The switch unit in the valve driving actuator includes a switch cam 17 such as a limit switch and a torque switch which are rotated by the output rotary shaft 5 and the rotary shaft 5, and a micro switch 26 which is operated by the switch cam 17. , 27, potentiometers 8, 24 attached to the frame 10 in the housing 22, and a scale plate 6 for visually checking the opening of the valve. The micro switches 26 and 27 have a number of contacts for receiving signals of information for the valves. In the switch unit, the output-side rotary shaft 5 connected to the input-side rotary shaft
Is rotated by the driving force from the input-side rotary shaft so that the opening of the valve by the scale plate 6 can be visually checked, and information is transmitted to the computer of the remote central control system via the potentiometers 8 and 24. It is configured to be able to make outgoing calls. In the switch unit, the switch cam 17 rotates, and the switch cam 1 is turned.
7 based on a predetermined profile.
When the micro switches 26 and 27 are operated, various information such as the valve opening and the spindle load are input to the controller by the operation of the micro switches 26 and 27, and the opening / closing operation of the valve can be controlled by a command of the controller.

This rotation transmitting structure is incorporated in a switch unit housed in the housing 22. A transparent plate 16 made of glass or the like is attached to a viewing window 23 formed in the housing 22 so that a person can see the scale plate 6 indicating the valve opening through the viewing window 23. This rotation transmission structure is rotatably supported by the frame 10 and has one side surface locked by a stopper 29 such as a washer provided on the rotation shaft 5 and the rotation shaft 5 to which the rotation force from the rotation drive source is transmitted. A pulley 1 (first pulley) that is fitted to the rotating shaft 5 so as to be fitted thereto, and an annular concave portion 1 formed on the other side surface of the pulley 1
9 and a dish-shaped hold spring 4 fitted to the rotary shaft 1 and a male screw 15 provided at one end of the rotary shaft 1 so that the outer periphery can be loosely fitted to the annular concave portion 19 of the pulley 1. It has a fixing nut 2.

In this rotation transmitting structure, when the fixed nut 2 is screwed into the rotating shaft 5, the hold spring 4 is pressed in the axial direction, and the outer diameter of the outer peripheral surface 20 of the hold spring 4 is enlarged and deformed. Of the pulley 1 is pressed and locked in the annular concave portion 19 of the pulley 1 to fix the pulley 1 to the rotating shaft 5. When the pulley 1 is removed from the rotary shaft 5 or the position of the pulley 1 fixed to the rotary shaft 5 is adjusted, the pulley 1 can be rotated with respect to the rotary shaft 5 only by loosening the fixing nut 2 slightly. The pulley 1 can be easily removed from the rotating shaft 5 or the fixed position of the pulley 1 with respect to the rotating shaft 5 can be adjusted.

A fixing screw 12 is attached to one end of the rotating shaft 5.
The scale plate 6 for displaying the valve opening degree is attached. The other end 28 of the rotating shaft 5 is connected to an input-side rotating shaft (not shown). A scale plate 6 for indicating the amount of rotation of the rotary shaft 5, for example, the valve opening, is attached to the tip of the output-side rotary shaft 5, and a pointer (not shown) provided on the scale plate 6 and the frame 10. And the rotation axis 5
By visually checking the amount of rotation of the valve, the degree of opening of the valve can be known. Further, a cam 17 for operating a torque switch and a limit switch is attached to the rotating shaft 5. The operation piece 18 fixed to the cam 17 is provided with micro switches 26 and 27 provided in a torque switch and a limit switch.
Activate on / off

As shown in FIGS. 1 and 2, the rotation transmitting structure includes a toothed belt having teeth 13 formed on the outer peripheral surface of the pulley 1 and teeth 14 meshing with the teeth 13. The present invention is applied to a pulley 7 (second pulley) having teeth 21 with which the teeth 14 of the attached belt 3 mesh with each other, and a rotation transmission system having a driven shaft 9 fixed to the pulley 7. A driven shaft 9 has a potentiometer 8 provided on a transmitter for indicating a valve opening.
Is installed. The pulley 7 is fixed to the driven shaft 9 by set screws 11 and 30. The rotation of the driven shaft 9 becomes a resistance value in the potentiometer 8 and transmits a transmission signal. The potentiometer 8 is a resistor having a sliding contact which can be continuously adjusted, and is used as a transmitter for transmitting information on the opening degree of the valve to a computer in a central information system installed at a remote place. Further, as shown by a two-dot chain line in FIG. 1, the driven shaft 35 equipped with the small potentiometer 24 can be operated by the toothed belt 3 via the pulley 25. Pulley 25 has set screws 33 and 34
Is fixed to the driven shaft 35.

FIG. 3 shows another embodiment of the rotation transmitting structure. The rotation transmitting structure according to this embodiment has a configuration in which the toothed belt 3 has a plurality of (two in FIG.
This is applied to operate the plurality of driven shafts 9 by meshing with the teeth 21. As in FIG. 2, the potentiometer 8 is mounted on the driven shaft 9.

The mounting structure of the cam 17 is a structure in which the mounting position with respect to the rotating shaft 5 can be adjusted so that the cam 17 operates at a predetermined phase in accordance with the rotation of the rotating shaft 5 constituting the cam shaft. The cam 17 has, for example, a cam profile bulging to a predetermined position on the outer peripheral surface.
When the rotary shaft 5 is driven to rotate when the valve is opened and closed, the cam 17 pushes the contacts of the microswitches 26 and 27 at predetermined angular positions. Micro switches 26 and 27
Is controlled in accordance with the rotation angle of the rotating shaft 5 to detect the degree of opening and closing of the valve, and is used to appropriately control the opening and closing of the valve based on the detected value.

The cam 17 is provided with a pair of washers 31 for applying a frictional force by sandwiching the micro switches 26 and 27 in the axial direction in order to prevent the cam 17 from rotating relative to the rotating shaft 5. Each washer 31 is formed with, for example, an engagement hole composed of an arc portion and a flat portion complementary to the cross-sectional shape of the rotating shaft 5. Therefore, each washer 31 is
Is in the non-restrained state in the axial direction, but is in the constrained state in the circumferential direction and cannot rotate relative to the rotating shaft 5.
In order to prevent the operation of the cams 17 from interfering with each other, a sleeve 32 fitted on the rotating shaft 5 separates the cams 17 in the axial direction of the rotating shaft 5. The sleeve 32 bears at both ends against a washer 31 associated with the cam 17.

[0024]

Since the rotation transmitting structure according to the present invention is constructed as described above, fine adjustment of the angular position of the pulley attached to the rotating shaft can be easily performed, and
Very easy attachment of the pulley to the rotating shaft. Therefore, this rotation transmission structure is preferable to be incorporated in the rotation transmission system of the switch unit in the valve drive actuator, and can transmit the degree of rotation to the driven shaft equipped with a potentiometer with high accuracy, and can also rotate the scale plate. The degree can be displayed with high accuracy. In addition, by using a toothed belt to transmit rotation from the rotating shaft to the driven shaft, backlash and the like that occur in the conventional gear transmission can be reduced, and the degree of rotation from the rotating shaft to the driven shaft can be reduced. Accurate transmission is possible, and rotation transmission to a plurality of driven shafts with respect to the rotation shaft can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a rotation transmitting structure according to the present invention.

FIG. 2 is a side view showing one embodiment of the rotation transmitting structure of FIG. 1;

FIG. 3 is a side view showing another embodiment of the rotation transmitting structure of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulley (1st pulley) 2 Fixed nut 3 Toothed belt 4 Hold spring 5 Rotating shaft 6 Scale plate 7, 25 Pulley (2nd pulley) 8 Potentiometer 9, 35 Follower shaft 10 Frame 11, 30, 33, 34 Set screw 12 Scale plate fixing screw 13 Teeth (first tooth) 14 Teeth (second tooth) 15 Male screw (rotating shaft) 16 Transparent lid 17 Cam 18 Micro switch lever 19 Annular recess 20 Outer peripheral surface 21 Teeth (third tooth) 22 Housing 23 viewing window 24 small potentiometer 26, 27 micro switch 28 the other end of the rotating shaft 29 stopper 31 washer 32 sleeve

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[Procedure amendment]

[Submission date] December 1, 2000 (200.12.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Further, in this rotation transmitting structure, by using a toothed belt for transmitting the rotation between the rotating shafts, the center of the rotating shafts can be freely set, and furthermore, the rotation transmission structure is generated by gears. Bakkura' sheet can be reduced, the degree of rotation of the rotary axis of the input side can be transmitted with high accuracy to the driven shaft, such as a potentiometer, it can transmit information with high accuracy. Also, by using a toothed belt, transmission of a plurality of rotating shafts can be performed, and for example, a plurality of potentiometers can be operated.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

This rotation transmission structure is, for example, a valve drive actuator provided with a rotation transmission device for rotating a valve such as a gate and a water gate in a flow path of a water channel, a water purification plant, etc. A potentiometer incorporated in an output-side rotary shaft 5 driven by an input-side rotary shaft to which rotation from a drive source such as a manual is transmitted, and a potential from a rotary shaft 5 in a transmitter for indicating a degree of opening in a switch unit.
This is applied to the degree of rotation of the scale plate 6 for transmitting the rotation to the meters 8 and 24 and displaying the degree of opening of the valve. In this embodiment, the scale plate 6 is rotated, and the degree of rotation of the scale plate 6 is detected by a pointer fixed to the frame 10 so that the valve opening can be visually checked.
Further, this rotation transmission structure is housed in the housing 22, and can be easily applied to an existing switch unit. The switch unit is configured as a unit that can be handled collectively so that the switch unit can be easily attached to and detached from the housing 22 for inspection and repair. The rotation shaft 5 is rotatable with respect to the frame 10 but is supported so as to be restricted in the axial direction.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

[0024]

Since the rotation transmitting structure according to the present invention is constructed as described above, fine adjustment of the angular position of the pulley attached to the rotating shaft can be easily performed, and
Very easy attachment of the pulley to the rotating shaft. Therefore, this rotation transmission structure is preferable to be incorporated in the rotation transmission system of the switch unit in the valve drive actuator, and can transmit the degree of rotation to the driven shaft equipped with a potentiometer with high accuracy, and can also rotate the scale plate. The degree can be displayed with high accuracy. Further, by using a toothed belt as transmission of rotation to the driven shaft from the rotary shaft, the Bakkura' sheet or the like which occurs in the conventional gear transmission can be reduced, the degree of rotation from the rotary shaft to the driven shaft Accurate transmission is possible, and rotation transmission to a plurality of driven shafts with respect to the rotation shaft can be easily performed.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16K 37/00 F16D 1/06 L

Claims (5)

[Claims] 1. A rotating shaft that is rotatably supported by a frame and to which a rotating force from a rotating drive source is transmitted, and one side surface is locked by a stopper provided on the rotating shaft and can be fitted to the rotating shaft. A first pulley attached to the shaft, a dish-shaped hold spring fitted to an annular recess formed on the other side surface of the first pulley and fitted to the rotating shaft, and a screw provided on the rotating shaft. In combination, the outer peripheral surface has a fixing nut that can be loosely fitted into the annular concave portion, and the hold nut is axially pressed by screwing the fixing nut into the rotating shaft to enlarge the outer diameter of the outer peripheral surface. A rotation transmitting structure, wherein the outer peripheral surface of the hold spring is deformed and pressed against the annular concave portion of the first pulley to fix the first pulley to the rotating shaft. 2. The rotation transmission structure according to claim 1, wherein a scale plate for displaying an opening is provided at one end of the rotation shaft. 3. A toothed belt having a first tooth formed on the outer peripheral surface of the first pulley, a second tooth meshing with the first tooth, and a third tooth meshing with the second tooth of the toothed belt. The rotation transmission structure according to claim 1, further comprising a second pulley having the second pulley, and a driven shaft fixed to the second pulley. 4. The rotation transmitting structure according to claim 3, wherein said driven shaft is applied to actuate a potentiometer provided in a transmitter for indicating a valve opening. 5. The toothed belt includes a plurality of the second belts.
4. The rotation transmitting structure according to claim 3, wherein the plurality of driven shafts can be operated by being engaged with a pulley.