JP2001263364A - Torque limiter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque limiter capable of stabilizing the magnitude of the limited torque while slipping so as to cut the transmission of the torque when the excessive torque is input. SOLUTION: In this torque limiter 1 fitted on an input shaft 2 of a valve, when the input torque from an operation handle 61 exceeds the predetermined value, a steel ball 29 held by an inside member 5 freely to be slid and energized outward in the radial direction by a coil spring 28 is moved backward, resisting the energizing force of the coil spring 28, from a recessed groove formed in the inner peripheral surface 24 of the outside member 4 at plural positions with equal space, and the outside member 4 and the inside member 5 are rotated in relation to each other so as to cut the transmitting torque. With this structure, applying of the excessive torque by a worker is prevented so as to prevent the generation of damage in a valve device stopped by a stopper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque limiter for avoiding transmission of torque exceeding a predetermined value, that is, an operation for erroneously opening and closing a valve when a manual valve is already in a fully open or fully closed state. The present invention relates to a torque limiter applicable to a valve opening / closing device that prevents a valve from being damaged by excessive torque even when the valve is operated.

[0002]

2. Description of the Related Art Many types of valves, such as gate valves, ball valves, and butterfly valves, are used in gas and liquid transportation lines including various plants, taking advantage of their respective characteristics. Of these, gate valves and butterfly valves are mainly used for water supply and sewerage, which are indispensable lifelines for citizens' lives. The use of a butterfly valve, which can be used for construction and can be used for shallow burial construction that can reduce laying construction costs, is becoming mainstream.

As shown in FIG. 9, a butterfly valve 71 is
A valve having a structure in which a disk 73 having substantially the same diameter as the pipe 72 to be connected is housed inside the valve body.
A maximum angle of 90 ° in the valve body, with the axis connecting the two fulcrums diametrically opposed on the outer circumference as the rotation axis AA.
Is provided. The state in which the disk 73 is rotated until it becomes parallel to the pipe laying direction (the direction perpendicular to the paper surface in FIG. 9) corresponds to the fully open position of the valve at which the flowing flow rate is the maximum flow rate. 9 discs than fully open position
The state of being moved by 0 ° corresponds to the fully closed position of the valve. One of the two fulcrums extends outside the valve body and serves as an input shaft (the output shaft 76 of the speed reducer 75). If the pipe 72 is laid above the ground instead of buried, the butterfly valve 71
There is no restriction on the arrangement direction of, that is, the extension direction of the input shaft,
In the case of buried laying, the input shaft is operated from the ground surface, and the extending direction of the input shaft is desirably upward. As the butterfly valve 71 is used for a pipe closer to the main pipe, the flow rate flowing through the pipe 72 increases, and the valve becomes a large valve. Since the larger the valve, the larger the rotating torque is required to operate the input shaft, the butterfly valve 71 incorporates the input reducer 75. In the case of the branch pipe, a small valve is used because the flow rate is small, and the input shaft can be directly operated.

[0004] Valves used in the lifeline of civil life are normally in a fully open state. When performing valve closing operation, perform operations to check the operation of the valve periodically, replace pipes and valves due to leakage or aging in the downstream area, temporarily stop due to extension of the lifeline, and unexpected The number of valve operations is usually very small because it is limited to the case of stopping the lifeline for disaster recovery.

[0005] Lifelines are rarely laid above ground in urban areas, most of which are buried underground. In order to open and close the buried lifeline, a manhole is formed so that the pipe is exposed at an appropriate point, and a valve that can be opened and closed from the outside is provided in the pipe that appears in the manhole. It is rare that a manhole is provided in the branch pipe, and the valve body is also provided buried underground. When the valve body is buried, a case in which an iron plate lid indicated as a water stop valve appears on the ground surface is buried so as to surround the valve body. The case is so large that the input shaft of the valve can barely be confirmed inside the case when the lid is opened, and is not necessarily placed in a favorable environment for opening and closing operations.

[0006] With regard to the opening and closing operation of the valve disposed in the manhole, an operator enters the manhole and performs opening and closing work with an operation handle. For a valve buried in the ground shallow from the surface of the earth, opening and closing the water stop valve provided on the surface of the ground and opening and closing the operation handle 61 (FIG. 9) brought by the user to engage with the input shaft of the valve enables opening and closing work. Will be implemented. Although an operation handle may be attached to a valve arranged in the manhole from the beginning, an operation handle 61 carried by an operator is generally used. Portable operation handle 61
Has a T-shape in its entirety, and is provided with a box spanner 62 at the tip. The box wrench 62 is engaged with a square shaft end formed on the outer periphery of the input shaft 2, and the operation handle 61 is rotated in this state, thereby opening and closing the butterfly valve 71.

[0007] Regarding the opening and closing operation of the valve in such a situation, the operator may erroneously damage the valve or the device. That is, the valve is provided with a simple pointer indicating the open / close position of the valve and a stopper for stopping the valve shaft from rotating out of the normal operation range when fully closed and fully opened. Some guidelines have been buried in earth and sand, and rust has been generated in adverse environments, making it difficult to confirm. In addition, since a recovery operation due to a disaster or a replacement operation due to omission is urgent, a hurried worker may make a mistake in confirmation. It is erroneously recognized that the valve needs to be fully closed even though the fully closed stopper is already in operation, and operating the valve with the operating handle may cause an accident that may damage the valve. The small valve is a mechanism that directly rotates the disk inside the valve body, and the rotation angle of the operation handle does not reach 90 ° or more, so it is easy for workers to notice, but for medium and large valves, the valve opens and closes. In some cases, an input speed reducer is incorporated in the mechanism, and the operating handle has to be operated many times, and is placed in a state where errors are more likely to occur.

In consideration of the above situation, the rotation torque given by the operator is limited, and when the valve is fully closed or fully opened,
There is provided a valve opening / closing device provided with a torque limiter for slipping when a torque exceeding a specified value is input by rotating an operation handle so that the rotation torque is not transmitted to an input shaft. Hereinafter, a torque limiter applied to the valve opening / closing device will be described with reference to FIG.

The torque limiter 40 includes an operation handle 61
A cap 41 having a shaft end 42 formed in a quadrangular prism on one side and a flange 44 on the opposite side so that a box spanner 62 (shown by imaginary lines) Flange part 4 placed against contact
6, the boss 4 fixed by a plurality of bolts 43
5. An upper end 3 of the input shaft 2 of the valve or the input reducer, which has a reduced diameter and a flange portion 48 facing the boss 45.
A key groove 49 is formed on the inner peripheral surface so as to be key-engaged by the key 50 and the key 50.
Boss 47 attached between the boss 45 and the stepped portion 53 of the input shaft 2 in a withdrawal-preventing state, and disposed between the boss 45 and the handle boss 47 so that the frictional fastening force is adjusted so that the valve Torque limiter 5 for limiting torque transmitted from boss 45 to handle boss 47 in opening and closing operations
4.

The torque limiter 54 has a handle boss 47.
The two frictional linings 55 and 55 formed in an annular shape and fitted on the outer periphery of the boss 45 with the boss 45 vertically interposed therebetween, and the key groove 56 formed on the outer periphery of the handle boss 47 are key-engaged, and one friction is formed. The pressing plate 57 presses the other friction lining 55 against the boss 45 via the flange portion 48 of the handle boss 47 by the reaction of pressing the lining 55 against the boss 45, and the male screw portion formed on the outer periphery of the handle boss 47. The frictional force of the disc spring 58 is adjusted by screwing and changing the degree of screwing, and one of the friction linings 5 via the washer 59, the disc spring 58, and the pressing plate 57.
5 is pressed against the boss 45 and the handle boss 47
Friction lining 55 via the flange 48
Adjusting nut 6 for adjusting the pressing force for pressing the boss 45 against the boss 45
0.

An operator engages the box spanner 62 of the operation handle 61 with the shaft end 42 of the cap 41 before opening and closing the valve. When a turning torque is applied to the operation handle 61 for opening and closing the valve, the turning torque is applied from the cap 41 to the boss 45.
Is transmitted to. Friction linings 55, 55 are in contact with both surfaces of the boss 45 by being urged by disc springs 58, and the rotational torque is applied to the two friction linings 5 from the boss 45.
The signal is transmitted to the handle boss 47 via the key 55 and the input shaft 2 via the key 50. When the rotation of the input shaft 2 is stopped by the operation of the stopper during opening and closing of the valve, the rotation torque given to the operation handle 61 is applied to the friction lining 5.
The friction linings 55 and 55 slip and prevent damage to the valve device.

[0012] Even if the torque limiter 40 is normal at the beginning of the installation of the valve, the following problems occur after a few days since the installation. That is, the installation environment of the valve is not always good, and rust may be generated inside the torque limiter 40 due to intrusion of moisture, and the friction coefficient of the friction linings 55, 55 that abut may become larger than the originally designed value. If the friction linings 55, 55 do not slip despite the action of the stopper, a large load acts on the valve. If the valve is frequently opened and closed, the generation of rust can be prevented, but with limited opening and closing of the valve, there is little opportunity for the generated rust to peel off. If the torque limiter 54 is filled with grease or other fat or oil, rust can be prevented from occurring, but this is not advantageous for a mechanism that transmits a rotational torque by frictional force. In addition, a problem still remains in the work procedure of the worker.

In general, the strength of an adult male is 150 N
The valve opening / closing device or the operating handle is designed to be about m to 200 N · m based on the numerical value. However, when the opening / closing work is rushed or becomes heavy due to rust, the operating handle 61 which is properly formed in a T-shape. There is a case where a pipe or the like is inserted into the grip portion of the handle and the grip portion is made longer than a normally formed dimension to give a rotating torque. If the opening / closing operation is performed in this manner, the torque becomes excessive, and the valve device may be damaged even though the stopper is acting.

[0014]

As described above, since the frictional force by the friction lining basically depends on the state of the friction surface of the friction lining, it cannot be said that it is always stable. When applied to a valve opening / closing device, it is difficult to understand whether the operation of the operation handle becomes heavy due to the generation of rust on the friction surface or the action of the stopper on the rotary shaft of the valve. Therefore, there is a problem to be solved in obtaining a torque limiter in which the magnitude of the limit torque for releasing the engagement is stabilized.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and the transmission of torque for opening and closing a valve is replaced with a mechanism for transmitting torque based on frictional force. The engagement state of the engagement portion is stable and the engagement is released by adopting a mechanism for performing the engagement that enables the engagement to be released according to the magnitude of the torque. The torque limiter is stable because the magnitude of the torque limit on the input side is stable. To provide.

According to the present invention, there is provided an outer member having a concave groove formed on an inner peripheral surface so that an opening side is widened in a circumferential direction, an inner member disposed rotatably in the outer member, and a sliding member which slides on the inner member. A meshing engagement member operably disposed and engageable with the concave groove of the outer member; and a meshing engagement member arranged on the inner member and moving the meshing engagement member toward an inner peripheral surface of the outer member. An urging means for urging, wherein when the torque transmitted between the outer member and the inner member is equal to or more than a predetermined value, the meshing engagement member has the concave against the urging means. The present invention relates to a torque limiter that blocks transmission of the torque by disengaging from a groove.

According to this torque limiter, until the torque acting between the outer member and the inner member reaches a predetermined value, the engagement member is biased toward the inner peripheral surface of the outer member by the biasing means. Since the urging member is urged and engaged with the concave groove formed on the inner peripheral surface of the outer member, torque is transmitted between the outer member and the inner member. When the torque transmitted between the outer member and the inner member becomes equal to or greater than a predetermined value, the meshing engagement member is pushed back from the opening side that widens in the circumferential direction of the concave groove against the urging force of the urging means. Therefore, no torque is transmitted between the outer member and the inner member. Since the engagement between the meshing engagement member and the concave groove is not easily affected by the friction coefficient such as lining,
The magnitude of the limiting torque that causes the engagement to be released is stabilized.

In this torque limiter, the concave grooves of the outer member are formed at a plurality of positions on the inner peripheral surface which are spaced at equal intervals in a circumferential direction, and the meshing engagement provided on the inner member is provided. The member and the urging means are provided in a plurality corresponding to the respective grooves. In the outer member and the inner member, since the concave groove and the meshing engagement member are arranged at positions equally divided in the circumferential direction, when the outer member and the inner member are relatively rotated, etc. Since the meshing engagement member engages with the concave groove at each interval and disengages immediately thereafter, the operator can recognize the normal operation of the torque limiter as a response.

The inner member has a radial accommodation portion extending radially from a central portion for accommodating the urging means, and communicating with a radially outer side of the radial accommodation portion and the inner periphery of the outer member. A passage is formed in the outer peripheral surface slidable with respect to the surface and the meshing engagement member is slidable in the radial direction. When the inner member is configured in this manner, the inner member only has the radial accommodation portion and the passage formed therein, and has a simple structure, a low axial height, and a compact torque limiter. . Further, the passage of the inner member is a through hole, and the meshing engagement member is a steel ball slidably disposed in the through hole. The steel ball slidable in the through hole is urged by an urging means housed in the radial housing, and engages and transmits torque when fitted into the concave groove, and the torque is equal to or more than a predetermined value. When it becomes, it retreats in the through hole and disengages from the concave groove. Further, the steel ball is slidably disposed within the radial accommodation portion of the inner member, and the inner periphery of the outer member is urged by the urging means via an auxiliary sliding piece extending into the through hole. Is biased toward the surface.
The auxiliary sliding piece is slidably disposed in the radial accommodation portion and receives an urging force from the urging means, so that the urging force is stably transmitted to the steel ball in the through hole, The steel ball is urged stably toward the inner peripheral surface of the outer member.

The meshing engagement member is an engagement slide piece slidably disposed in the radial accommodation portion of the inner member and extending in the passage. An engagement sliding piece slidably disposed in the radial accommodation portion and extending in the passage is urged toward the inner peripheral surface of the outer member by receiving the urging force from the urging means, and Engage directly in the groove. Therefore, the number of components constituting the torque limiter is also reduced. Also,
The concave groove of the outer member is formed from a groove bottom and an inclined surface inclined on both circumferential sides of the inner peripheral surface of the groove bottom, and the engaging sliding piece has a tip portion that fits into the concave groove. The groove is formed in a tapered shape having an inclined surface corresponding to the inclined surface.

In this torque limiter, the urging means is a coil spring. The coil spring can secure a necessary urging force even if the coil diameter is small, and contributes to reducing the height of the torque limiter.

A fat and oil for rust prevention and lubrication is sealed between the inner member and the outer member, and leakage of the sealed fat and oil is prevented between the inner member and the inner member. To prevent moisture and foreign matter from entering from outside,
Sealed. In other words, even if it is placed in a bad environment, the generation or rust of the oil or fat is reliably prevented by the application or filling, and no rust is generated inside the torque limiter.

The outer member has a cylindrical portion which is open on one side and has an inner peripheral surface on a peripheral surface formed on the inner side, and the inner member has the cylindrical portion with the radial accommodation portion inside. The case has a disk portion, and the axial depth of the cylindrical portion of the case member is substantially equal to the thickness of the disk portion of the lid member. By configuring the outer member and the inner member in this manner, the axial length of the torque limiter can be shortened as much as possible, and when applied to a lifeline gate valve, a narrow space such as a manhole is required. The workability when opening and closing the valve inside is improved.

The torque limiter enables the outer member to be connected to one of an operating handle and a valve or an input shaft of an input reduction gear connected to the valve, and connects the inner member to the operating handle and the input shaft. As connectable to the other of
Applied to valve opening and closing devices. By applying the torque limiter to the valve opening / closing device, the rotation torque given by the operation handle is transmitted through the meshing engagement, and the valve is fully opened or fully closed and the stopper is acting. Nevertheless, when the operating handle is further operated to apply the turning torque, the torque limiter cuts off the turning torque, so that even if the operator makes a mistake in the work procedure, it is possible to prevent the device from being damaged. It is. Further, plates, linings, disc springs, nuts, and the like, which are necessary for the conventional device, are not required, the height in the axial direction is reduced, and the valve opening / closing device is compact.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a torque limiter applied to a valve opening / closing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of a torque limiter applied to a valve opening / closing device according to the present invention, in which a right half shows a fastened state and a left half shows a fastened state. 2 is a plan view of an inner member used for the torque limiter shown in FIG. 1, FIG. 3 is a side view of an inner member used for the torque limiter shown in FIG. 1, and FIG. 4 is an outer member used for the torque limiter shown in FIG. FIG. 5 is a perspective view showing a piece used in the torque limiter shown in FIG. 1,
6 is a partially enlarged view when the torque limiter shown in FIG. 1 is in a fastened state, and FIG. 7 is a partially enlarged view when the torque limiter shown in FIG. 1 is in a fastened state.

Referring to the torque limiter shown in FIG.
The torque limiter 1 is applied to an end, preferably an upper end 3, of the input shaft 2 of a valve or an input reduction gear, and is used to rotate the input shaft 2 by operating the operation handle 61 carried by an operator. It is applied to the valve opening / closing device used. As described below, when the opening / closing torque exceeds a predetermined value, the torque limiter 1
Is provided with a meshing engagement mechanism 20 that does not transmit an operating force to the motor. By rotating the operation handle 61 in a state where the box spanner 62 of the operation handle 61 is engaged with the shaft end 6 of the cap-shaped outer member 4, the torque limiter 1 is rotated.
Is applied to the input shaft 2 to open and close the valve.

The torque limiter 1 is formed in a case shape having a shaft end 6 formed by projecting from a square pole so as to engage with a box spanner 62 of an operation handle 61 and a cylindrical portion 4a open at one side. An outer member 4 and an inner member 5 which is loosely slidably contacted with the outer member 4 and is fixed to the input shaft 2 of the valve. The inner member 5 is held at the upper end 3 of the input shaft 2 by a set screw 8 which can be screwed in from the outside and a key 10 which key engages with a key groove 9.
And a disk portion 5a that is slidably accommodated in the cylindrical portion 4a facing the side where the outer member opens. Therefore, the outer member 4 and the inner member 5 are arranged so as to be able to rotate relative to each other. Outer member 4
The axial depth of the cylindrical portion 4a is substantially equal to the thickness of the disk portion 5a of the inner member 5. By configuring the outer member 4 and the inner member 5 in this manner, the axial length of the torque limiter 1 can be reduced as much as possible. The workability when opening and closing the valve in a narrow space is improved.

The inner member 5 is prevented from coming off from the outer member 4 by the snap ring 11 in order to keep the inner and outer cases 4 and 5 attached. The torque limiter 1 has grease inside for rust prevention and lubrication.
Is filled on the input shaft 2 of the valve or the input reduction gear, and is fixed to the input shaft 2 with the set screw 8. Also, between the two members 4 and 5, an O-ring fitted into a peripheral groove 12 a formed in the inner member 5 in order to prevent intrusion of moisture and foreign matter from the outside and leakage of oil and fat filled in the inside and the like. The seal is provided by the engagement of 12 with the peripheral surface of the outer member 4. The inner and outer members 4 and 5 are in a state where the outer peripheral portion 15 and the end surface 16 of the inner member 5 are in contact with the stepped portion 13 and the end surface 14 formed on the outer member 4, and are slidable with each other.

Mesh engagement mechanism 2 between inner and outer members 4 and 5
0 is stored. As shown in FIGS. 2 and 3, the inner member 5 has a plurality (six in the illustrated example) of radial engagements for accommodating urging means and the like, as shown in FIGS. The portions 21 are formed as concave grooves extending radially from the center of rotation at positions equidistantly spaced in the circumferential direction. A through hole 22 as a passage through which a steel ball 25 as a meshing engagement member is slidable communicates with each radial direction accommodation portion 21 on the distal end side. The through hole 22 extends in the radial direction and opens to the outer peripheral surface 23 of the inner member 5.

As shown in FIG. 4, on the inner bottom surface of the outer member 4, a concave portion 21a is formed in an annular area corresponding to the radial length of the radial accommodation portion 21.
An end surface 14 which is in sliding contact with the inner member 5 is formed in the radially inner and outer regions. The outer member 4 has an inner peripheral surface 24 that is in sliding contact with the outer peripheral surface 23 of the inner member 5. Each through hole 2 formed in the inner member 5 is formed in the inner peripheral surface 24.
Corresponding to No. 2, concave grooves 25 into which steel balls 29 are fitted and engaged are formed at positions spaced at equal intervals in the circumferential direction. As shown in FIG. 6 and FIG.
A groove bottom 26 extending in a direction parallel to the axial direction of the input shaft 2;
On both sides of the groove bottom portion 26, that is, in the circumferential direction of the inner peripheral surface 24, there are formed inclined surfaces 27, 27 inclined from the groove bottom portion 26 in the ascending direction and connected to the inner peripheral surface 24. Therefore,
The concave groove 25 has an angle θ at the position of the inner peripheral surface 24 (FIG. 7).
As shown by, the opening side is formed in a shape that becomes wider.

When the outer member 4 and the inner member 5 are mounted on each other, a coil spring 28 as a biasing means is accommodated in each radial accommodating portion 21 of the inner member 5 in a compressed state. Is loaded in the through hole 22. An auxiliary sliding piece 30 is slidably mounted on each of the radial accommodation portions 21 and each of the through holes 22. As best shown in FIG. 5A, the auxiliary sliding piece 30 is slidably fitted into the radial accommodation portion 21 and slides into the through hole 22 extending from the horn portion 31. The coil spring 28 is in contact with the back surface 33 of the angular portion 31, and the distal end surface 34 of the cylindrical portion 32 is in contact with the steel ball 29. The coil spring 28 mounted in a compressed state urges the auxiliary sliding piece 30 radially outward by the spring force as the urging force, and causes the steel ball 29 to move inside the outer member 4 via the auxiliary sliding piece 30. It is biased toward the peripheral surface 24.

When the valve needs to be opened and closed, the operator engages the box spanner 62 of the operation handle 61 with the square pole-shaped shaft end 6 of the outer member 4. Next, the operation handle 6
When a rightward or leftward rotation torque is applied to one grip portion, the outer member 4 also rotates in the same direction. Since steel balls 29 held by the inner member 5 and urged by the coil springs 28 are in contact with the concave grooves 25 formed on the inner peripheral surface 24 of the outer member 4, each steel ball 29 is The rotation torque applied to the steel balls 29 is received by the equal division and transmitted to the inner member 5 holding the steel balls 29. The inner member 5 is fixed to the input shaft 2 of the valve or the input reducer, and the input shaft also rotates in the same direction as the two operation handles 61 to open and close the valve. FIG. 6 and the right half of FIG.
Shows a state in which the steel ball 29 is engaged with the concave groove 25, that is, a state in which the meshing engagement mechanism 20 is in the engaged state.

When the valve is fully opened or fully closed by the above operation, the inner member 5 stops because the valve stopper acts. Further, when the operator gives a rotational torque with the operation handle 61, the steel ball 29 which has been in contact with the groove 25 of the outer member 4 is pushed out of the groove 25 by climbing the inclined surface 27, and the auxiliary sliding piece is provided. The coil spring 28 is retracted radially inward while compressing the coil spring 28 against the urging force of the coil spring 28 via 30. When the diameter drawn by the tip of the steel ball 28 becomes equal to the inner circumference of the outer member 4, the steel ball 28 is disengaged from the groove 25 and
The outer member 4 is rotatable relative to the inner member 5 because the inner peripheral surface 24 can be rolled. At this time, since the load applied to the operation handle 61 is eliminated and the handle operation is lightened, the operator can intuitively know that the valve has been fully opened or fully closed. 1 and FIG. 7
Shows a state in which the steel ball 29 retreats from the concave groove 25 and is disengaged, that is, a state in which the meshing engagement mechanism 20 is in the disengaged state.

As described above, when the valve is fully opened or fully closed and the stopper is actuated, the inner and outer members 4, 5 slip with each other even if the operating handle 61 is operated thereafter. Reference numeral 20 denotes a safety device that shuts off a turning torque from the operation handle. In the embodiment, the outer member 4
, The load applied to the operation handle 61 becomes heavy every 60 °. By repeating the feeling of heavy and light several times in the operation of the steering wheel, it is possible to more reliably know that the valve is fully open or fully closed. The limiting torque (torque of a predetermined value) at which a further rotation torque should be cut off corresponding to the target valve is determined by the opening angle θ of the inclined surface 27 of the concave groove 25 formed in the outer member 4 and the inner member 5. Is determined by the biasing force of the coil spring 28 housed in the coil spring 28. A slip set value is determined in advance according to the type of valve, and a valve opening / closing device selected to match the slip set value of the valve to be opened / closed can be used.

As a countermeasure against rust, when the torque limiter 1 is assembled, it can be dealt with by applying or filling grease or other fat or oil. Also, the concave groove 25 of the outer member 4
, The inner peripheral surface of the through hole 22 for holding the steel ball 29 of the inner member 5, and the steel ball 29
It is desirable that a hardening treatment be performed as a surface treatment. As another structure of the sliding piece, a structure shown in FIG. 5B can be used. The sliding piece shown in FIG.
A V-shaped engagement sliding piece 35 formed on a front end portion 36 formed on a vertical convex surface and inclined surfaces 37 on both sides thereof so as to directly engage with the concave groove 25. Engagement sliding piece 35
Is slidably disposed in the radial accommodation portion 21 of the inner member 5 and extends through the through hole 22.

The torque limiter according to the present invention is not limited to the above-described embodiment, and various changes can be made. For example, in the above-described embodiment, the example in which the outer member 4 is arranged on the upper side and the inner member 5 is arranged on the lower side has been described. However, if the usage environment permits, the arrangement is reversed, and the inner member 5 is arranged on the upper side. It is also possible to connect to the handle 61 and to connect the outer member 4 to the input shaft of the valve or an input reduction gear connected to the valve by disposing the outer member 4 on the lower side. Further, the radial accommodation portion 21 is formed in a square cross section, but may be formed in a U-shaped cross section. Further, a coil spring 28
However, it is clear that an elastic body such as rubber may be used.

[0037]

The valve opening / closing device according to the present invention has the above-described structure, and has the following effects. That is, the torque limiter transmits the applied rotation torque by acting on the engagement engagement member such as a steel ball or an engagement sliding piece and the concave groove, for example, when the valve is fully opened or fully closed. When one of the inner and outer members becomes unrotatable, such as when a stopper is acting, and a rotating torque is further applied to the other member, the meshing engaging member is disengaged from the groove and rotated. Cut off the torque. Therefore, even if the rotation torque is further applied, the device to which the torque limiter is applied will not be damaged. Further, since it is possible to fill the inside of the torque limiter with fats and oils, measures are taken against rust. Conventionally, since the cause of the heavy operating handle cannot be identified, the operator inserts a pipe or the like into the grip, and as a result, excessive torque is applied to promote damage, but such problems should be prevented. Can be. Also, in the conventional torque limiter using the friction lining, the plate, the lining, the disc spring, the nut and the like were longitudinally overlapped to increase the axial length, whereas in the torque limiter according to the present invention, Such components are not required, have a shorter axial length, and are easier to apply in a wide variety of fields. When the torque limiter according to the present invention is applied to a valve opening / closing device,
If the valves are the same size, they need only be approximately half the height, which is suitable for a valve opening / closing device buried in a shallow layer. Further, in the torque limiter according to the present invention, it is possible to perform a rust prevention treatment between the inside and a sealing treatment between the outside, and as a result, the limited torque (slip set value) is stable even after a number of days after the valve is arranged. In addition, it is possible to prevent a situation in which the valve does not slip even at a torque greater than the limit torque due to the fixation at the engagement portion, and that when the valve operation shaft is stopped by the stopper action, the valve device may be damaged by excessive torque. Absent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a torque limiter provided with a meshing engagement mechanism according to the present invention, wherein a right half shows a fastening state and a left half shows a fastening release state.

FIG. 2 is a plan view of an inner member used in the torque limiter shown in FIG.

FIG. 3 is a side view of an inner member used in the torque limiter shown in FIG.

FIG. 4 is a bottom view of an outer member used in the torque limiter shown in FIG.

FIG. 5 is a perspective view showing a piece used in the torque limiter shown in FIG.

FIG. 6 is a partially enlarged view when the torque limiter shown in FIG. 1 is in a fastening state.

FIG. 7 is a partially enlarged view when the torque limiter shown in FIG. 1 is in a disengaged state.

FIG. 8 is a cross-sectional view showing a conventional torque limiter using a slip method.

FIG. 9 is a schematic view showing a state in which a butterfly valve is opened and closed via a speed reducer by operating an operation handle.

[Description of Signs] 1 Torque limiter. 2 Input shaft 4 Outer member 4a Cylindrical part 5 Inner member 5a Disk part 12 O-ring (seal) 21 Radial accommodating part 22 Through hole (passage) 23 Outer peripheral surface 24 Inner peripheral surface 25 Recessed groove 26 Groove bottom 27 Inclined surface 28 Coil Spring (biasing means) 29 Steel ball (mesh engagement member) 30 Auxiliary slide piece 35 Engage slide piece 36 Tip 37 Slope 61 Operating handle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H063 AA02 AA06 BB16 DA02 DB06 DB48 EE05 EE08 GG06 GG12 3J070 AA13 BA47 CC04 CC07 CD32 CD33 CD35 DA14 DA21

Claims (11)

[Claims] 1. An outer member having a concave groove formed on an inner peripheral surface such that an opening side is widened in a circumferential direction, an inner member disposed relatively rotatably in the outer member, and slidable on the inner member. A meshing engagement member arranged and engageable with the concave groove of the outer member; and a meshing engagement member arranged on the inner member and biasing the meshing engagement member toward an inner peripheral surface of the outer member. When the torque transmitted between the outer member and the inner member is equal to or more than a predetermined value, the meshing engagement member moves from the concave groove against the urging means. A torque limiter that interrupts the transmission of the torque by disengagement. 2. The concave groove of the outer member is formed at a plurality of locations on the inner peripheral surface that are equally spaced circumferentially,
2. The torque limiter according to claim 1, wherein the engagement member and the biasing means provided on the inner member are provided in a plurality corresponding to the respective grooves. 3. 3. The inner member has a radial storage portion that extends radially from a central portion and stores the biasing means, and communicates with a radial outside of the radial storage portion. 3. The torque limiter according to claim 1, wherein an opening is formed in an outer peripheral surface slidable with respect to an inner peripheral surface, and a passage is formed in which the meshing engagement member is slidable in a radial direction. 4. The method according to claim 3, wherein said passage of said inner member is a through hole, and said meshing engagement member is a steel ball slidably disposed in said through hole. The described torque limiter. 5. The outer member of the outer member is urged by an urging means via an auxiliary sliding piece which is slidably disposed in the radial receiving portion of the inner member and extends into the through hole. 5. The torque limiter according to claim 4, wherein said torque limiter is urged toward said inner peripheral surface. 6. The engagement member, wherein the engagement member is an engagement slide piece slidably disposed in the radially-receiving portion of the inner member and extending in the passage. 3
The torque limiter according to 1. 7. The concave groove of the outer member is formed of a groove bottom and an inclined surface inclined on both circumferential sides of the inner peripheral surface of the groove bottom, and the engaging slide piece is formed in the concave groove. 7. The torque limiter according to claim 6, wherein a tip end to be fitted is formed in a tapered shape having an inclined surface corresponding to the inclined surface of the concave groove. 8. The torque limiter according to claim 1, wherein said urging means is a coil spring. 9. A rust-preventive and lubricating oil and fat is sealed between the inner member and the outer member, and leakage of the sealed oil and fat is prevented between the inner member and the inner member. 9. The torque limiter according to claim 8, wherein a seal is provided to prevent moisture and foreign matter from entering from outside. 10. The outer member has a cylindrical portion that is open on one side and has an inner peripheral surface included in a peripheral surface formed on the inner side, and the inner member has the radial accommodation portion inside. 2. A disk device according to claim 1, further comprising a disk portion accommodated in said cylindrical portion, wherein an axial depth of said cylindrical portion of said case member is substantially equal to a thickness of said disk portion of said lid member. 9
The torque limiter according to any one of the above. 11. The torque limiter enables the outer member to be connected to one of an operation handle and a valve or an input shaft of an input reducer connected to the valve, and connects the inner member to the operation handle and the input handle. 2. The valve control device according to claim 1, wherein said shaft is connectable to the other end of said shaft.
The torque limiter according to any one of claims 10 to 10.