JPH11304040A - Valve operating cap furnished with slipping mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent transmission of excessive torque to an input shaft. SOLUTION: A square cylindrical sleeve 51 is inserted into a hole part 14, a recessed part 14a to be engaged with a corner part 15a of a sleeve 15 around a shaft center on an inner peripheral surface of the hole part 14, an adapter 16 forming a fitting hole 17 to fit on an input shaft 2 is inserted into the sleeve 15, a corner part 16a of the adapter 16 is formed on a circular arc slipping surface and an outside surface 16b of the adapter 16 is formed on a flat torque transmitting surface to make contact with an inside surface of the sleeve 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for connecting a cap and an input shaft in a valve operating device, and more particularly to a valve operating cap provided with a slip mechanism.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, for example, in a valve operating device 1 or the like, a cap 3 is provided on an input shaft 2 of the operating device 1, and the cap 3 is operated by an operating rod (not shown) or the like. It is driven to rotate and transmits the driving force of the operation rod to the input shaft 2 via the cap 3. The cap 3 forms the input shaft 2 in a pyramid shape, and the cap 3 is provided with a pyramid-shaped hole 4 to be fitted to the input shaft 2 to thereby prevent rotation around the axis of the input shaft 2. The cap 3 is prevented from coming off the input shaft 2 by the fixing bolt 5. Input shaft 2
In some cases, the cap and the cap 3 are joined by penetrating the input shaft 2 with a shear pin provided on the cap 3.

[0003]

However, in the conventional structure described above, when the driving force is transmitted by fitting the input shaft 2 having a pyramid or prism shape to the hole 4 of the cap 3, If the excessive torque is applied to the cap 3 beyond the rotation limit of the valve when the valve is fully opened or fully closed, the cap 3 transmits all the applied torque to the input shaft 2, so that the valve may be damaged. there were.

An object of the present invention is to provide a slip mechanism for preventing transmission of excessive torque to an input shaft and a valve operating cap provided with the slip mechanism.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a valve operating cap having a slip mechanism according to the present invention is mounted on an input shaft of a valve to transmit torque. The sleeve has a hole that fits loosely into the hole, a square tubular sleeve is inserted into the hole, and a recess is formed in the inner peripheral surface of the hole to lock the corner of the sleeve around the axis. Insert an adapter with a fitting hole that fits into the shaft, form the corners of the adapter on an arc-shaped slip surface, and form the outer surface of the adapter on a flat torque transmitting surface that abuts the inner surface of the sleeve. It was done.

[0006] The fitting hole is formed such that an inner surface abutting on the input shaft is parallel to an outer surface of the input shaft.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Members performing the same operations as those described above with reference to FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. 1 to 3, a cap 11 is mounted on an input shaft 2 of a valve operating device 1 to transmit torque. The cap 11 is rotated by an operating rod (not shown) or the like, so that an input is performed. The shaft 2 is rotated. Input shaft 2
Is shaped like a prism or a pyramid, and has a square or hexagonal cross-sectional shape, and may be the valve stem itself.

The cap 11 has an input shaft portion 12 fitted to an operation rod (not shown) in the shape of a prism or a pyramid, and has a socket portion 13 mounted on the input shaft 2 of the operating device 1.
A hole portion 14 that fits loosely into the input shaft 2 is provided.

The hole portion 14 is formed in a large-diameter portion 14A on the opening side by a square tubular sleeve 15 having a corner portion 15a having an arcuate roundness.
Are formed on the inner peripheral surface of the large-diameter portion 14A of the hole portion 14. A plurality of recesses 14a are formed to engage with the respective corners 15a of the sleeve 15, and the recesses 14a and the corners 15a are engaged. The cap 11 and the sleeve 15 are mutually locked around the axis. The concave portion 14a and the corner portion 15a may have an angular shape.

The sleeve 15 is made of an elastically deformable spring material, a metal material, a resin material, or the like, and has an adapter 16 removably inserted therein. The adapter 16 has a fitting hole 17 for fitting to the input shaft 2, the corner 16 a forms an arc-shaped slip surface having a larger radius of curvature than the corner 15 a of the sleeve 15, and the outer surface 16 b of the sleeve 15 It forms a flat torque transmitting surface that contacts the inner surface. The corner 16b of the adapter 16 may be formed in a circular curved surface centered on the axis of the adapter 16.

The fitting hole 17 has an inner surface 17a in contact with the input shaft 2 formed in parallel with the outer surface of the input shaft 2. When the input shaft 2 has a prismatic shape, it is parallel to the axis. When the input shaft 2 has a pyramid shape, it is formed on a tapered surface inclined with respect to the axis.

One of the purposes of mounting the adapter 16 is that when the input shaft 2 is manufactured with a pyramid surface, a prism surface with a small dimensional error relative to the straight sleeve is secured on the outer peripheral portion of the input shaft. However, it is to stably slip between the input shaft 2 and the sleeve 16 having different shapes. That is, the adapter 16 moves in the axial direction of the input shaft 2, and the fitting hole 17, which forms a pyramid-shaped tapered surface of the adapter 16, is fitted to the input shaft 2 at a position corresponding to the size of the input shaft 2. And a prismatic surface with a small dimensional error is formed on the outer peripheral portion.

Another object is to provide a sleeve 15 having a straight body shape.
Is adapted to the input shaft 2 having a different shape. The adapter 16 is provided with a fitting hole 1 corresponding to the shape of the input shaft 2 to be mounted.
By changing to the adapter 16 having 7, the same cap 11 can be mounted on the input shaft 2 having a different shape.

A spring-shaped stopper 18 is provided in the small diameter portion 14B on the back side of the hole 14, and the tip of the stopper 18 is engaged with the recess 19 of the input shaft 2 and the recess 20 of the hole 14. The cap 11 is prevented from coming off.

The operation of the above configuration will be described below. As shown in FIG. 2, when the cap 11 is mounted on the input shaft 2, the recess 14 a of the hole 14 is
5 is locked around the axis, and the sleeve 1
The inner surface of 5 is in contact with the outer surface 16b, which is the torque transmitting surface of the adapter 16.

When the cap 11 is rotationally driven by an operating rod or the like mounted on the input shaft portion 12 at the time of opening and closing the valve, torque is transmitted to the input shaft 2 via the sleeve 15 and the adapter 16, and the input shaft 2 rotates. The valve opens and closes.

As shown in FIG. 3, when the valve is fully opened or fully closed, when excessive torque is applied to the cap 11 beyond the rotation limit of the valve, the sleeve 15 is elastically deformed and the corner 16a of the adapter 16 is The sleeve 15 rotates while slipping at the corner 16a forming the slip surface of the adapter 16 while allowing the passage, or the corner 15a of the sleeve 15 is detached from the recess 14a of the hole 14, and excessive torque is applied to the input shaft. 2 to prevent transmission.

The resistance of the sleeve 15 to the input torque is set to an arbitrary value by changing the arc shape of the corner 16a of the adapter 16 or by selecting the material and thickness of the material constituting the sleeve 15. The drag of the sleeve 15 is set in accordance with a preset excessive torque value.

[0019]

As described above, according to the present invention, the input shaft and the cap are joined via the sleeve and the adapter, and the corner of the adapter is formed into a circular arc-shaped slip surface. Is formed on a flat torque transmitting surface that abuts against the inner surface of the sleeve, so that the sleeve elastically deforms and rotates while slipping around the adapter against excessive torque, or the sleeve is removed from the recess in the hole. The detachment of the corner prevents an excessive torque from being transmitted to the input shaft. In addition, the same cap can be attached to input shafts having different shapes by the adapter, so that the versatility of the cap can be improved and a dimensional error of the input shaft can be absorbed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a valve operation cap according to an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the valve operation cap.

FIG. 3 is an explanatory view showing the operation of the valve operation cap.

FIG. 4 is a sectional view showing a conventional valve operating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operating device 2 Input shaft 11 Cap 14 Hole 14a Depression 15 Sleeve 15a Corner 16 Adapter 16a Corner 17 Fitting hole

Claims (2)

[Claims] 1. A valve for transmitting torque by being mounted on an input shaft of a valve. The valve has a hole for loosely fitting to the input shaft, and a square tubular sleeve is inserted into the hole. A concave part is formed on the peripheral surface to lock the corner of the sleeve around the axis, and an adapter with a fitting hole for fitting to the input shaft is inserted into the sleeve, and the corner of the adapter is formed into an arc-shaped slip. A valve operating cap provided with a slip mechanism, wherein the valve operating cap is formed on a flat surface, and an outer surface of the adapter is formed on a flat torque transmitting surface abutting on an inner surface of the sleeve. 2. The valve operating cap with a slip mechanism according to claim 1, wherein the fitting hole has an inner surface which is in contact with the input shaft and is formed in parallel with an outer surface of the input shaft.