JP2017155846A - Rotor, cylindrical cam mechanism, and valve unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor, a cylindrical cam mechanism, and a valve unit that can adjust the position of a follower and can reduce driving time while having a simple structure.SOLUTION: A rotor according to the present invention comprises a cylindrical body part 81, and a cam groove 85 formed in the body part 81. At least one end of the cam groove 85 comprises straight parts 86a and 86b nearly perpendicular to a central axis of the body part 81.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotor, a cylindrical cam mechanism, and a valve unit.

  Conventionally, a valve unit that blocks or switches a flow path of a fluid such as gas has been proposed. For example, in a gas meter or the like, a valve unit (shutoff valve) that shuts the flow path in an openable / closable manner is provided as a safety device in the flow path in the gas meter in order to stop gas supply in the event of an earthquake or other disaster. .

  The valve unit generally includes a valve seat into which a fluid flows, a valve body that opens and closes a flow path that communicates with the valve seat, a drive gear that operates the valve body, and the like (see, for example, Patent Document 1). The valve body and the drive gear are screwed together by a slide screw, and the drive body rotates by the transmitted driving force of the motor, so that the valve body advances and retreats. The valve body moves forward and backward with respect to the valve seat by the action of the drive gear, opens and closes the flow path, and switches the communication state between the valve seat and the flow path.

  In Patent Document 1, the valve element is advanced and retracted by a slide screw. However, for the sake of space, the screw diameter is reduced, and the screw pitch is reduced.

  In order to solve the above problem, for example, it is conceivable to advance and retract the valve body with a cylindrical cam instead of a slide screw (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2015-62015 JP 2014-40792 A

  However, in a general cylindrical cam in which a cam groove having a predetermined pressure angle is formed on the outer periphery of the cylinder, it is difficult to adjust the position of the valve body, which may cause gas leakage and the like.

  The present invention has been made in view of the above, and includes a rotor, a cylindrical cam mechanism, and a valve unit that can adjust the position of the follower and can reduce the driving time while having a simple configuration. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, a rotor according to the present invention includes a columnar body portion and a cam groove formed in the body portion, and at least one of the cam grooves. The terminal end of the main body has a straight portion substantially perpendicular to the central axis of the main body.

  Moreover, the rotor according to the present invention is characterized in that, in the above invention, the cam groove has the straight portions of substantially the same length at both ends.

  The rotor according to the present invention is characterized in that, in the above invention, the two cam grooves are formed on the outer peripheral surface of the main body portion in a 180 ° rotational symmetry.

  A cylindrical cam mechanism according to the present invention includes the rotor according to any one of the above and a follower, and the follower is rotated by the rotation of the rotor around the axis thereof. It moves forward and backward in the axial direction.

  A valve unit according to the present invention includes a drive gear including the rotor according to any one of the above, a cylindrical valve seat forming a part of a flow path into which fluid flows, and the flow path. A valve body that opens and closes; a drive source; and one or more gears that are rotated by driving the drive source, the drive gear being rotated about an axis by the gear, and the valve body is configured to move relative to the valve seat. It is characterized by moving forward and backward.

  In the valve unit according to the present invention, any one of the one or more gears includes a slip mechanism.

  According to the present invention, it is possible to provide a rotor, a cylindrical cam mechanism, and a valve unit that can shorten the driving time and can easily adjust the position of the follower.

FIG. 1 is a cross-sectional view showing a valve unit according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the flow path is closed in the valve unit of FIG. FIG. 3 is an exploded perspective view of the valve unit shown in FIG. FIG. 4 is a diagram illustrating the structure of a reduction gear that functions as a slip mechanism. FIG. 5 is an enlarged cross-sectional view of the reduction gear shown in FIG. 6A is a perspective view, FIG. 6B is a front side view, and FIG. 6C is a rear side view of the drive gear used in the valve unit shown in FIG. 1. FIG. 7 is a perspective view of a valve body used in the valve unit shown in FIG. FIG. 8: is the (a) left side view, (b) front side view, (c) right side view, (d) back side view of the drive gear concerning the modification of embodiment of this invention. FIG. 9 is a cross-sectional view taken along line AA in FIG.

  Hereinafter, a rotor, a cylindrical cam mechanism, and a valve unit according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by the following embodiment. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate, and repeated descriptions are omitted as appropriate.

  FIG. 1 is a cross-sectional view showing a valve unit 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the flow path is closed in the valve unit of FIG. FIG. 3 is an exploded perspective view of the valve unit shown in FIG. The valve unit 1 includes a valve seat 10, a valve body 20, a seal member 30 (for example, packing), an annular member 40 (for example, washer), a column member 50, an actuator 60, a housing 70, and a drive. And a gear 80. The valve unit 1 is attached to a flow path of a gas meter, for example, and has a function of shutting off gas (fluid) supply in an emergency or the like. The valve body 20 is an aspect of the follower according to the present invention. Further, the valve body 20 and the drive gear 80 form one aspect of a cylindrical cam mechanism according to the present invention.

  In the present embodiment, a flow path is formed between the seal member 30 and the valve body 20. The valve seat 10 has a substantially cylindrical shape and forms part of a flow path into which a fluid flows. In the present embodiment, gas flows through the valve seat hollow portion from above to below the valve seat 10 shown in FIG. A groove 11 for attaching the seal member 30 is formed along the circumferential direction at the end of the valve seat 10 on the valve body 20 side (lower end in FIG. 1).

  In the valve unit 1, when the flow path is open as shown in FIG. 1, the fluid flowing in from above the valve seat 10 flows out through the gap between the column members 50. On the other hand, when the flow path is closed as shown in FIG. 2, the flow of the fluid flowing in from above the valve seat 10 is stopped at the position of the valve body 20. The valve body 20 includes a guide portion 21 that is inserted into a shaft hole 84 of the drive gear 80, which will be described later, a cylindrical portion 22 into which the drive gear 80 is inserted, a conical portion 23 provided at the tip of the cylindrical portion 22, and a cone. An annular portion 24 having an annular shape with a radial direction from the outer edge of the portion 23 to a direction perpendicular to the height direction of the conical portion 23 is formed. The valve body 20 is made of resin or the like, and each part (guide part 21, cylindrical part 22, conical part 23, and annular part 24) is integrally formed by molding. Further, the central axes of the guide portion 21, the cylindrical portion 22, the conical portion 23, and the annular portion 24 are coaxial.

  A D-cut surface as shown in FIG. 7 is formed in a part of the cylindrical portion 22, and the rotation around the axis of the valve body 20 is restricted by engaging with the casing 70 that supports the cylindrical portion 22. In this state, the valve body 20 moves back and forth with respect to the valve seat 10. The valve body 20 is constantly urged toward the valve seat 10 by a spring member 25 as urging means.

  The seal member 30 is attached to the valve seat 10 so that a gap between the valve seat 10 and the valve body 20 can be sealed. The seal member 30 includes a seal portion main body 31, an outer wall portion 32 erected with respect to the seal portion main body 31 along the outer edge of the seal portion main body 31, and a circumferential direction on the inner peripheral side of the outer wall portion 32. And an inner wall portion 33 provided. The seal portion main body 31 has a bottom surface portion 31a formed in an annular shape, and a slope portion 31b formed so as to extend radially inward from the inner edge of the bottom surface portion 31a and along the inner surface of the valve seat 10. Yes.

  In the valve unit 1, when the flow path is closed as shown in FIG. 2, the inclined surface portion 31 b of the seal portion main body 31 is such that the valve body 20 advances toward the valve seat 10 and the pressing surface of the annular portion 24 of the valve body 20. 24a abuts. When the valve body 20 further advances toward the valve seat 10, the slope portion 31 b of the seal portion body 31 is pressed toward the valve seat 10 by the annular portion 24, and the slope portion 31 b and the annular portion 24 come into close contact with each other. Thereby, the clearance gap between the sealing member 30 and the valve body 20 is closed, and a flow path is closed.

  The outer wall portion 32 and the inner wall portion 33 are fitted in the groove portion 11 formed in the valve seat 10. The outer wall portion 32 is inclined and extended outward in the radial direction of the seal portion main body 31. The outer wall portion 32 is in contact with the outer wall 11a side of the groove portion 11. The inner wall portion 33 is fitted on the inner wall 11b side of the groove portion 11 and extends in a direction intersecting with a surface formed by the circumference of the seal portion main body 31 (a surface including the left-right direction and the paper surface vertical direction in FIG. 1). It is formed inside the part 32. In other words, the inner wall portion 33 extends in a direction crossing the radial direction of the seal portion main body 31 and is formed on the inner side of the outer wall portion 32 at the end portion of the seal portion main body 31.

  The seal member 30 having the above-described configuration has, for example, a Y-shaped cross-sectional shape at the radially outer end portion by the seal portion main body 31, the outer wall portion 32, and the inner wall portion 33. Such a Y-shaped cross-sectional shape is created by, for example, forming a groove 34 (concave portion) on the side opposite to the side where the annular member 40 is disposed at the radially outer end of the seal member 30.

  The annular member 40 is formed in an annular shape and is disposed so as to contact the bottom surface portion 31 a of the seal member 30. The annular member 40 is preferably made of a highly rigid material such as a metal material. The column member 50 supports the annular member 40, and the column member 50 presses the bottom surface portion 31 a of the seal member 30 toward the valve seat 10 via the annular member 40. The column member 50 is connected to the housing 70, and is configured such that a groove formed in the column member 50 is caught in a groove formed on the outer peripheral surface of the valve seat 10, whereby the valve seat 10 is It is attached to the housing 70.

  The actuator 60 includes a motor (drive source) 61 and a plurality of reduction gears 62 and 63 that rotate by driving of the motor 61. In the present embodiment, a gear 61b attached to the output shaft 61a of the motor 61, two-stage reduction gears 62 and 63, and a third gear 83 of a drive gear 80 described later are in mesh with each other.

  The two reduction gears 62 and 63 transmit the driving force of the motor 61 to the driving gear 80 while increasing the torque while decelerating. The reduction gear 62 rotates while meshing with the gear 61b, and receives the driving force of the motor 61 from the gear 61b. Further, the reduction gear 62 rotates while meshing with the gear 61b and the other reduction gear 63, whereby the driving force of the motor 61 transmitted from the gear 61b is reduced to increase the torque to the other reduction gear 63. introduce. The other reduction gear 63 rotates while meshing with the reduction gear 62 and the drive gear 80, thereby transmitting the driving force of the motor 61 transmitted from the reduction gear 62 to the drive gear 80 while decelerating and increasing the torque. . In the present embodiment, two reduction gears 62 and 63 are provided, but the number of reduction gears may be one, or two or more (plural).

  FIG. 4 is a diagram illustrating the structure of the reduction gear 62 that functions as a slip mechanism. FIG. 5 is an enlarged cross-sectional view of the reduction gear 62 shown in FIG. The reduction gear 62 includes a shaft 62a, a large diameter gear portion 62b, a small diameter gear portion 62c, a friction plate 62d, and a spring 62e, and functions as a slip mechanism that limits the driving force transmitted from the motor 61. . In the present embodiment, the slip mechanism is disposed in the reduction gear 62, but the present invention is not limited to this, and the slip gear 63 may be provided with a slip mechanism.

  The shaft 62 a is made of metal or the like and serves as the rotation center of the reduction gear 62.

  The large-diameter gear portion 62 b is a rotating body that is fixed to the shaft 62 a and driven by the motor 61. The large-diameter gear portion 62b is formed of a resin or the like and includes a disc-shaped bottom plate 62f and a cylindrical portion 62g integrally formed on the bottom plate 62f as shown in FIG.

  The cylindrical portion 62g is erected on the edge of the bottom plate 62f, and a first gear 62h is formed on the outer peripheral surface thereof, and meshes with a gear 61b attached to the output shaft 61a of the motor 61.

  The friction plate 62d is formed of a metal plate, a resin plate, or the like, and has an annular shape. The outer diameter of the friction plate 62d is slightly smaller than the inner diameter of the cylindrical portion 62g of the large diameter gear portion 62b, and the inner diameter is slightly larger than the inner diameter of a groove portion 62m formed in the small diameter gear portion 62c described later.

  The small diameter gear portion 62c is a rotating body that is rotatably supported by the shaft 62a. The small-diameter gear portion 62c is made of resin or the like, and includes a second gear 62j, a disc portion 62k, and a groove portion 62m. The second gear 62j is formed with a smaller diameter than the large-diameter gear portion 62b, is erected at the center of the disc portion 62k, has a gear formed on its outer peripheral surface, and meshes with the large-diameter gear portion 62b of the reduction gear 63. Yes.

  The outer periphery of the disc portion 62k is formed smaller than the inner diameter of the cylindrical portion 62g of the large-diameter gear portion 62b, and has a function as a lid for pressing the friction plate 62d accommodated in the large-diameter gear portion 62b. . A through hole 62n having a diameter larger than the outer diameter of the shaft 62a is provided at the rotation center of the bottom plate 62f and the disc portion 62k.

  The groove portion 62m is provided on the outer peripheral side of the surface of the disc portion 62k that contacts the large diameter gear portion 62b. The inner diameter of the groove 62m is smaller than the inner diameter of the friction plate 62d.

  The spring 62e is made of metal or resin, and urges the reduction gear 62 toward the first case portion 70a described later.

  The driving force generated by the motor 61 is transmitted to the reduction gear 63 due to friction between the friction plate 62d and the large diameter gear portion 62b and the small diameter gear portion 62c. On the other hand, when an excessive overload is applied from the outside, the friction plate 62d Slips with respect to the large-diameter gear portion 62b or the small-diameter gear portion 2c, so that the torque applied to the motor 61 can be suppressed. In the present embodiment, by providing a slip mechanism in the reduction gear 62, torque at the end of the cam groove 85 (described later) in the process of closing the flow path of the valve unit 1 is not directly transmitted to the motor 61 side. , The load on the gear 61b, the reduction gears 62 and 63, and the guide pin 26 (see FIG. 7) can be reduced. In the present embodiment, the slip mechanism is employed to reduce the load on the gear 61b and the like. However, it is sufficient if the structure can reduce the load on the gear 61b and the like. A clutch or a two-way clutch may be employed.

  The housing 70 houses the components of the valve unit 1, specifically, the valve body 20 and the actuator 60. In the present embodiment, the housing 70 is configured by assembling a first case portion 70a and a second case portion 70b, for example, as shown in FIG. The first case portion 70 a is a housing portion that houses the valve body 20 and the motor 61 of the actuator 60. The second case portion 70b is a housing portion that houses the reduction gears 62 and 63 and the drive gear 80 of the actuator 60 by being pivotally supported or supported rotatably from the lower side (the negative side in the axial direction).

  6A is a perspective view, FIG. 6B is a front side view, and FIG. 6C is a rear side view of the drive gear 80 used in the valve unit 1. The drive gear 80 includes a columnar body portion 81 and a disk portion, and a gear portion 82 that is coaxially and integrally formed with the body portion 81 on the outer peripheral side surface of the body portion 81 and functions as a rotor. To do.

  The main body 81 has a shaft hole 84 whose one end opens at the center of the cylinder, and a cam groove 85 is formed on the outer peripheral side surface on the side where the shaft hole 84 opens. The cam groove 85 has a rotation angle of 360 °, and linear portions 86a and 86b perpendicular to the central axis of the main body 81 are formed at the upper end (opening side of the shaft hole 84) and the lower end (gear portion 82 side). Yes. The straight portions 86a and 86b are formed to have substantially the same length. Note that a dummy groove may be formed in the main body portion 81 in consideration of formability. The cam groove 85 may be formed at a lower cost in consideration of the mold structure of injection molding.

  A third gear 83 is formed on the outer periphery of the gear portion 82 and meshes with the small diameter gear of the reduction gear 63.

  The valve body 20 is inserted through the cylindrical portion 22 from the outer peripheral side of the cylindrical portion 22 after inserting the main body portion 81 into the cylindrical portion 22 while inserting the guide portion 21 into the shaft hole 84. By being press-fitted into the cam groove 85, the drive gear 80 is connected. Alternatively, the valve body 20 may be connected to the drive gear 80 so that the guide pin 26 bends when the drive gear 80 is inserted. The cam groove 85 may be formed on the inner peripheral surface side of the main body portion 81. In this case, the guide pin 26 may be provided on the outer peripheral surface side of the cylindrical portion 22.

  When the driving force is transmitted from the motor 61 via the reduction gears 62, 63, etc., the driving gear 80 rotates, and the guide pin 26 press-fitted into the cam groove 85 moves along the cam groove 85 as the driving gear 80 rotates. The valve body 20 moves forward and backward in the axial direction (vertical direction).

  In the present embodiment, since the valve body 20 is advanced and retracted in the axial direction by the drive gear 80 functioning as a cylindrical cam, the drive time, that is, the time required to open and close the valve unit 1 can be reduced. Further, since the straight portion 86a perpendicular to the central axis of the main body 81 is formed at the upper end of the cam groove 85, the position of the valve body 20 can be easily adjusted when closing the flow path, and fluid leakage is prevented. can do. Furthermore, by forming the straight portions 86a and 86b at the upper and lower ends of the cam groove 85, it is possible to convert the valve body 20 to advance and retract without loss while maintaining the torque of the motor 61. Therefore, the load applied to the motor 61 can be reduced. Further, since the straight portions 86a and 86b are formed to have substantially the same length, it is possible to obtain the same effect of reducing the load on the motor 61 when the flow path is opened and when the flow path is closed. . The straight portions 86a and 86b do not necessarily have to be perpendicular to the central axis of the main body portion 81, and may be formed so as to hold the torque of the motor 61. Furthermore, since the slip gear 62 is provided with a slip mechanism, damage to the gear and the guide pin 26 can be prevented.

  In the above-described embodiment, the drive gear in which one cam groove 85 is formed has been described. However, the present invention is not limited to this and may have two cam grooves. FIG. 8: is the (a) left side view, (b) front side view, (c) right side view, (d) back side view of the drive gear concerning the modification of embodiment of this invention. FIG. 9 is a cross-sectional view taken along line AA in FIG.

  The drive gear 80A according to the modified example has two cam grooves 85a and 85b formed on the outer peripheral surface of the main body 81 so as to be 180 ° rotationally symmetric.

  In the modified example, the valve body 20 is configured such that the guide portion 21 is inserted into the shaft hole 84 and the main body portion 81 is inserted into the cylindrical portion 22, and then the two guide pins 26 are cylindrical from the outer peripheral side of the cylindrical portion 22. The drive gear 80A is connected by press-fitting into the cam grooves 85a and 85b through the portion 22.

  In the modified example, since the valve body 20 and the drive gear 80A are connected by the two guide pins 26, the valve body 20 can be advanced and retracted stably even in a large cylindrical cam mechanism.

  As described above, the embodiment of the present invention has been described by taking the valve unit as an example. However, the present invention is not limited to this, and the rotor according to the present invention is preferably used also in a barrel of an illumination device or a camera. It is possible.

DESCRIPTION OF SYMBOLS 1 Valve unit 10 Valve seat 11 Groove part 11a Outer wall 11b Inner wall 20 Valve body 21 Guide part 22 Cylindrical part 23 Conical part 24 Annular part 25 Spring member 26 Guide pin 30 Seal member 31 Seal part main body 31a Bottom face part 31b Slope part 32 Outer wall part 33 Inner wall portion 34 groove portion 40 annular member (frame member)
50 Column member 60 Actuator 61 Motor 61a Output shaft 61b Gear 62, 63 Reduction gear 62a Shaft 62b Large diameter gear portion 62c Small diameter gear portion 62d Friction plate 62e Spring 62f Bottom plate 62g Cylindrical portion 62h First gear 62j Second gear 62k Disc portion 62m Groove 62n Through hole 70 Housing 80, 80A Drive gear 81 Main body 82 Gear 83 83 Third gear 84 Shaft hole 85, 85a, 85b Cam groove 86a, 86b Straight line

Claims (6)

A rotor that is rotated by a rotation mechanism,
A cylindrical main body,
A cam groove formed in the main body,
At least one end of the cam groove has a linear portion substantially perpendicular to the central axis of the main body.   The rotor according to claim 1, wherein the cam groove has the straight portions having substantially the same length at both ends.   3. The rotor according to claim 1, wherein the two cam grooves are formed on the outer peripheral surface of the main body portion so as to be 180 ° rotationally symmetric. The rotor according to any one of claims 1 to 3,
A follower, and
A cylindrical cam mechanism in which the follower advances and retreats in the axial direction of the rotor by rotation around the axis of the rotor. A drive gear including the rotor according to claim 1;
A cylindrical valve seat that forms part of the flow path through which the fluid flows;
A valve body for opening and closing the flow path;
A driving source;
One or more gears rotated by the drive source,
The valve unit is characterized in that the drive gear is rotated about an axis by the gear, and the valve body advances and retreats with respect to the valve seat.   The valve unit according to claim 5, wherein any one of the one or more gears includes a slip mechanism.

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