JP2002061668A - Valve operation cap with slip mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve operation cap with a slip mechanism capable of easily changing and adjusting the slip torque from the external even after the assembling. SOLUTION: This valve operation cap comprises a cap body 11 having a hole part 14 for freely fitting an input shaft, a hub 17 freely fitted inside the hole part 14 and engaged with an input shaft around a shaft center, a ring 16 axially movably fitted and mounted on the depth end side of the hole part 14 and engaged with the cap body 11 around the shaft center, an annular belleville spring 15 mounted at a depth end of the hole part 14 and pressing the ring 16 to the hub 17, teeth parts respectively formed on contact faces of both of the ring 16 and the hub 17 and having inclined faces to be engaged with each other around the shaft center, a lid part 31 mounted on an opening of the hole part 14 and rotatably holding the hub 17, and a torque adjusting screw 32 screwed and mounted on the lid part 31 and pressing the ring 16 and the hub 17 in the axial direction of the hole part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional operation cap is, for example, as shown in FIGS. The valve operating cap 10 with the slip mechanism is a cap body 11 (see FIGS. 8 and 9).
Is composed of an input shaft portion 12 and a socket portion 13, and the input shaft portion 12 fitted to an operation rod (not shown) has a prismatic or pyramid shape, and is mounted on the input shaft 2 of the operating device 1.
3 is provided with a hole portion 14 that is loosely fitted to the input shaft 2. The hole 14 has an octagonal inner peripheral surface, and accommodates therein a disc spring 15, a ring 16, a hub 17, and a lid 18 in this order from the back end side. A disc spring 15 (see FIG. 16) located at the far end of the hole 14 is an elastic body that presses the ring 16 toward the hub 17 and is loosely fitted in the hole 14 in an annular shape.

A hub 17 which forms an output shaft (FIGS. 10 to 11)
Has a pyramid-shaped fitting hole 19a fitted to the input shaft 2 of the operating device, and an annular flange portion 19b abutting on the ring 16, and is rotatable with respect to the hole portion. At the same time, it is engaged with the input shaft 2 around the axis. A cover 18 (see FIGS. 14 and 15) disposed at the opening of the hole 14 holds the hub 17 rotatably and is fixed to the cap body 11 by a fixing pin 18a.

The ring 16 (see FIGS. 12 to 13)
The outer peripheral surface has an octagonal shape and is engaged with the cap body 11 around the axis, and is fitted and mounted on the rear end side of the hole portion 14 so as to be movable in the axial direction, and receives the urging force of the disc spring 15. And is in contact with the annular flange 19b of the hub 17. The contact surfaces of both the ring 16 and the annular flange 19b, and the annular flange 19b and the lid 1
8 respectively have tooth portions 20, 21, 2
2, 23, and each tooth portion 20, 21, 22, 2
3 are inclined surfaces 20a, 21a, which engage with each other around the axis.
22a and 23a.

A fixing bolt 24 penetrating in the axial direction from the top side is mounted on the cap body 11 via a washer 25. The fixing bolt 24 is inserted through the disc spring 15, the ring 16, and the hub 17, and the lower end is connected to the lower end. Screwed to input shaft 2.

Hereinafter, the operation of the above configuration will be described. When the valve operating cap 10 with the slip mechanism is mounted on the input shaft 2 of the operating device 1, the ring 16 is engaged with the cap body 11 around the axis, and the hub 17 is engaged with the input shaft 2 around the axis. The disc spring 15 presses the ring 16 against the annular flange 19b of the hub, and the two teeth 20 and 21 mesh around the axis, so that the two teeth 2 of the annular flange 19b and the lid 18 are both engaged.
The fixing bolts 24 rotatably support the cap body 11 about the axis of the input shaft 2 and prevent the cap body 11 from coming off in the axial direction.

In this state, the cap body 11, the ring 1
6. The hub 17 rotates integrally, and the torque around the axis applied to the cap body 11 at the time of opening and closing the valve is transmitted to the input shaft 2 via the ring 16 and the hub 17, and the valve is opened and closed via the operating device 1. Operate.

When excessive torque acts on the cap body 11 when the valve is fully opened or closed, or when the input shaft 2 cannot rotate for some reason, the ring 16
Inclined surfaces 20a of the tooth portions 20, 21 with which the hub 17 abuts.
21a, tooth portions 22, 2 of both the annular flange portion 19b and the lid 18.
3 slips on the inclined surfaces 22a and 23a, the ring 16 moves toward the far end of the hole 14 against the urging force of the disc spring 15, and the lid 18 and the cap body 11 move downward, and the ring 16 The engagement between the teeth 20 and the teeth 21 of the hub 17 is disengaged, the engagement between the teeth 22 of the annular flange 19b and the teeth 23 of the lid 18 is disengaged, and the cap body 11 idles with respect to the hub 17. This prevents excessive torque from being transmitted to the input shaft 2.

At this time, the fixing bolt 24 supports the cap main body 11 rotatably around the axis of the input shaft 2 and prevents the cap body 11 from coming off in the axial direction without obstructing the operation of the slip mechanism. The valve operating cap 10 with a mechanism does not fall off the input shaft 2.

[0010]

However, in the above-mentioned conventional structure, the valve operating cap 10 with the slip mechanism is not provided.
Since the number of the disc springs 15 housed in the cap body 11 and the amount of bending thereof are fixed once assembled,
When the slip torque between the hub 6 and the hub 17 cannot be changed from outside, and the slip torque is to be changed, it is necessary to temporarily disassemble the valve operating cap 10 with the slip mechanism and change the type and quantity of the disc spring 15. was there.

An object of the present invention is to provide a valve operating cap with a slip mechanism that can easily change and adjust the slip torque from the outside even after the assembly.

[0012]

According to a first aspect of the present invention, there is provided a valve operating cap with a slip mechanism having a hole having a hole for loosely fitting an input shaft to be operated. A hub, which is loosely fitted in the hole and is engaged with the input shaft around the axis, is fitted and mounted on the far end side of the hole so as to be movable in the axial direction, and is engaged with the cap body around the axis. A ring to be fitted, an annular elastic body disposed at the back end of the hole and pressing the ring against the hub, and an inclined surface formed on the contact surface of both the ring and the hub and engaged with each other around the axis. A tooth having
A lid is provided at the opening of the hole to hold the hub rotatably, and a torque adjusting screw screwed to the lid to press the ring and the hub in the axial direction of the hole. .

With the above configuration, in the mounted state,
The ring engages with the cap body about the axis, the hub engages with the input shaft about the axis, and the elastic body presses the ring against the hub so that both teeth mesh about the axis. In this state, the cap body, the ring, and the hub rotate integrally, and torque around the axis applied to the cap body is transmitted to the input shaft via the ring and the hub.

If the input shaft does not rotate for some reason,
When excessive torque acts on the cap body, the ring and the hub slip mutually on the inclined surfaces of the teeth where the ring and the hub come into contact, and the ring separates from the hub in the axial direction of the hole against the urging force of the elastic body. This prevents excessive torque from being transmitted to the input shaft due to disengagement between the ring and the hub. At this time, the elastic body is compressed in the axial direction of the hole by a net amount necessary for the ring and the hub to slip, and is elastically deformed.

When adjusting the slip torque at which the ring and the hub are disengaged from each other, the ring and the hub are pressed in the axial direction of the hole by the torque adjusting screw to adjust the amount of deformation (adjustment deflection) to the elastic body in advance. )give. This allows
When the ring and the hub slip, the elastic body needs to elastically deform by the sum of the net deformation and the adjustment deformation required for the ring and the hub to slip, allowing the ring and the hub to slip. The slip torque increases.

According to a second aspect of the present invention, there is provided a valve operating cap with a slip mechanism according to the present invention. A hub that engages around the center, and is fitted and mounted movably in the axial direction on the back end side of the hole, and a ring that engages with the cap body around the center of the hole, and is disposed at the back end of the hole, An annular elastic body that presses the ring against the hub, a tooth portion formed on the contact surface of both the ring and the hub and having an inclined surface that engages with each other around the axis, and that the hub is rotatably held. And a torque adjusting screw screwed into the opening of the hole to press the ring and the hub in the axial direction of the hole.

With the above configuration, when adjusting the slip torque at which the ring and the hub are disengaged from each other, the ring and the hub are pressed in the axial direction of the hole by the torque adjusting screw to adjust the amount of the deformation to the elastic body in advance. (Adjustment deflection).
As a result, when the ring and the hub slip, the elastic body needs to elastically deform by the sum of the net deformation and the adjustment deformation required for the ring and the hub to slip, and the ring and the hub need to be elastically deformed. The slip torque that allows the slip increases.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Since the basic configuration of the valve operation cap with a slip mechanism in the present embodiment is the same as that described above, members performing the same operations are denoted by the same reference numerals and description thereof is omitted.

In FIG. 1, a valve operating cap 10 with a slip mechanism is mounted on an operating device for rotating a valve stem of a valve or a valve stem. The lid 31 attached to the opening of the hole 14 receives the disc spring 15, the ring 16, and the hub 17 in the axial direction of the hole 14, and
7 is rotatably held. At an appropriate position on the outer peripheral surface of the lid portion 31, there is provided a lid projection portion 31 a projecting radially outward, and at an appropriate position on the inner peripheral surface of the socket portion 13, a socket projection portion 13 a projecting radially inward is provided. The lid projection 31 a and the socket projection 13 a are engaged with each other in the axial direction of the hole 14, thereby fixing the lid 31 to the socket 13.

A plurality of torque adjusting screws 32 are screwed into the lid 31 at appropriate intervals in the circumferential direction, and the torque adjusting screws 32 project from the lid 31 to connect the ring 16 and the hub 17 to the holes 14. Is pressed in the axial direction.

The operation of the above configuration will be described below. When the valve operating cap 10 with the slip mechanism is mounted on the input shaft 2 of the operating device 1, the ring 16 is engaged with the cap body 11 around the axis, and the hub 17 is engaged with the input shaft 2 around the axis. The disc spring 15 presses the ring 16 against the annular flange 19b of the hub, and the two teeth 20 and 21 mesh around the axis, so that the two teeth 2 of the annular flange 19b and the lid 18 are both engaged.
2, 23 mesh around the axis.

In this state, the cap body 11, the ring 1
6. The hub 17 rotates integrally, and the torque around the axis applied to the cap body 11 at the time of opening and closing the valve is transmitted to the input shaft 2 via the ring 16 and the hub 17, and the valve is opened and closed via the operating device 1. Operate.

When excessive torque acts on the cap body 11 when the valve is fully opened or fully closed, or when the input shaft 2 cannot rotate for some reason, the ring 16
And the inclined surfaces 20a of the tooth portions 20, 21 with which the hub 17 abuts.
21a, tooth portions 22, 2 of both the annular flange portion 19b and the lid 18;
3 slips on the inclined surfaces 22a and 23a, the ring 16 moves toward the far end of the hole 14 against the urging force of the disc spring 15, and the lid 18 and the cap body 11 move downward, and the ring 16 The engagement between the teeth 20 and the teeth 21 of the hub 17 is disengaged, the engagement between the teeth 22 of the annular flange 19b and the teeth 23 of the lid 18 is disengaged, and the cap body 11 idles with respect to the hub 17. , And prevents excessive torque from being transmitted to the input shaft 2.

At this time, the disc spring 15 is elastically deformed from the unloaded state shown in FIG. 2A to the loaded state shown in FIG. 2B, and the ring 16 and the hub 17 slip. The ring 16 and the hub 17 are slipped with a predetermined slip torque by being compressed in the axial direction of the hole portion 14 and elastically deformed by a net deformation amount L1 necessary for the rotation.

To adjust the slip torque at which the ring 16 and the hub 17 are disengaged, the torque adjusting screw 3
2, the ring 16 and the hub 17 are pressed in the axial direction of the hole portion 14 to give the disc spring 15 an adjustment deformation amount (adjustment deflection amount) in advance.

As a result, the disc spring 15 is elastically deformed from the preload state shown in FIG. 3A to the load state shown in FIG. 3B, and when the ring 16 and the hub 17 slip. The disc spring 15 has a net deformation L1 and an adjustment deformation L2 required for the ring 16 and the hub 17 to slip.
Must be elastically deformed by the combined amount, and the slip torque that allows the ring 16 and the hub 17 to slip increases.

Therefore, with the valve operating cap 10 with the slip mechanism assembled, the torque adjusting screw 32 is
By adjusting the amount of protrusion of, the amount of adjustment deformation (the amount of adjustment deflection) L2 can be set to an arbitrary amount and the slip torque can be changed to an arbitrary amount.

Further, as shown in FIG. 4, by interposing a spacer 33 between the ring 16 and the lid 31, a predetermined amount of adjustment deformation (adjustment deflection) L2 is given in a stepwise manner, and further, torque adjustment is performed. By adjusting the protrusion amount of the screw 32, the adjustment deformation amount (adjustment deflection amount) L2 is set to an arbitrary amount while continuously finely adjusting.

As shown in FIG. 5, a torque adjusting screw 33 also serving as a cover is screwed into the opening of the hole 14 of the socket 13 to press the ring and the hub in the axial direction of the hole. It is also possible to use

[0030]

As described above, according to the present invention, the ring and the hub are pressed in the axial direction of the hole by projecting the torque adjusting screw by an arbitrary amount, and the elastic body is adjusted in advance by the amount of adjustment deformation ( When the ring and the hub slip, the elastic body is elastically deformed by the sum of the net deformation necessary for the ring and the hub to slip and the adjustment deformation, thereby obtaining the ring and the hub. Can be adjusted to an arbitrary value.

[Brief description of the drawings]

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

FIGS. 2A and 2B are explanatory views showing the action of a disc spring in a valve operation cap at the time of no adjustment.

FIGS. 3A and 3B are explanatory views showing the action of a disc spring when adjusting torque in a valve operation cap.

FIG. 4 is a cross-sectional view of a valve operating cap showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a valve operating cap showing another embodiment of the present invention.

FIG. 6 is a sectional view of a conventional valve operation cap.

FIG. 7 is a bottom view of the valve operation cap.

FIG. 8 is a half sectional view of a cap body in the valve operation cap.

FIG. 9 is a bottom view of a cap body in the valve operation cap.

FIG. 10 is a half sectional view of a hub in the valve operation cap.

FIG. 11 is a bottom view of a hub in the valve operation cap.

FIG. 12 is a half sectional view of a ring in the valve operation cap.

FIG. 13 is a bottom view of a ring in the valve operation cap.

FIG. 14 is a plan view of a lid of the valve operation cap.

FIG. 15 is a half sectional view of a lid in the valve operation cap.

FIG. 16 is a sectional view of a disc spring in the valve operation cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Valve operation cap with a slip mechanism 11 Cap main body 12 Input shaft part 13 Socket part 14 Hole part 15 Disc spring 16 Ring 17 Hub 19a Fitting hole 19b Annular flange part 20, 21, 22, 23 Teeth part 20a, 21a, 22a, 23a Inclined surface 24 Fixing bolt 25 Washer 31 Lid 32 Torque adjusting screw

Claims (2)

[Claims] 1. A cap body having a hole which is loosely fitted in an input shaft to be operated, a hub which is loosely fitted in the hole and is engaged with the input shaft around an axis, and a rear end of the hole. A ring that is fitted to the side so as to be movable in the axial direction and engages with the cap body around the axial center, an annular elastic body that is arranged at the back end of the hole and presses the ring against the hub, and a ring A tooth portion formed on both contact surfaces of the hub and having inclined surfaces that engage with each other around the axis, a lid portion that is disposed in the opening of the hole portion and rotatably holds the hub, and a lid portion. A valve operating cap with a slip mechanism, comprising: a torque adjusting screw which is screwed in and presses the ring and the hub in the axial direction of the hole. 2. A cap body having a hole which is loosely fitted to an input shaft to be operated, a hub which is loosely fitted in the hole and is engaged with the input shaft around the axis, and a rear end of the hole. A ring that is fitted to the side so as to be movable in the axial direction and engages with the cap body around the axial center, an annular elastic body that is arranged at the back end of the hole and presses the ring against the hub, and a ring A tooth formed on both contact surfaces of the hub and having inclined surfaces that engage with each other around the axis, and the hub is rotatably held and screwed into the opening of the hole, and the ring and the hub are mounted. A valve operating cap with a slip mechanism, comprising: a torque adjusting screw for pressing the hole in the axial direction.