WO2023127996A1

WO2023127996A1 - Speed reducer for correcting bidirectional thrust and displacement

Info

Publication number: WO2023127996A1
Application number: PCT/KR2021/020133
Authority: WO
Inventors: 나향근; 김성화; 강재용
Original assignee: 주식회사 삼보산업
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-07-06

Abstract

An embodiment of the present invention provides a speed reducer for correcting bidirectional thrust and displacement, the speed reducer comprising: a first housing; a drive sleeve axially supported so as to be rotatable inside the first housing; a speed reducing part for transmitting rotational force to the drive sleeve; a second housing provided below the first housing and coupled to the first housing; an external stem nut that is provided inside the second housing and receives rotational force from the drive sleeve; an elastic assembly that is provided inside the second housing and contracts or extends in response to changes in the position of the external stem nut; an internal stem nut provided inside the external stem nut and screw-coupled to a valve stem shaft that extends from a valve body; and a stem nut supporting/fixing part that is coupled to the lower end of the external stem nut and prevents the internal stem nut from separating from the external stem nut. The upper end of the internal stem nut is supported by and fixed to a stepped support part formed inside the external stem nut, and the lower end of the internal stem nut is supported by and fixed to the stem nut supporting/fixing part.

Description

Bidirectional Thrust and Displacement Compensation Reducer

The present invention relates to a bi-directional thrust and displacement compensating reducer, and more particularly, to a bi-directional thrust and displacement compensating reducer that is easy to replace a stem nut and can be manufactured in a small size.

In general, a valve is configured to control a flow amount while flowing a fluid such as gas or liquid.

These valves may have various types of valves depending on the operating principle. Among them, a gate valve, a globe valve, a plate stock valve, and the like are configured to open and close a pipeline through vertical movement or axial movement of a valve stem shaft. The valve stem shaft may open and close the valve by receiving rotational force from an actuator including a stem nut, a bevel gear, and a rotating shaft or an opening and closing device.

Meanwhile, when a high-temperature or ultra-low-temperature fluid flows into the conduit, the valve may be thermally expanded or contracted by the high-temperature or ultra-low-temperature fluid. When the thermal expansion or contraction of the valve occurs in this way, a problem may occur in the valve's tightness or opening/closing amount control.

In addition, when the valve is frequently operated or used for a long time, a problem may occur in the valve's tightness or opening/closing amount control due to wear of internal components. In particular, wear is mainly generated in the valve stem shaft and stem nut portions where screw coupling is performed.

Here, in the conventional bi-directional thrust and displacement compensation reducer, when replacement of the stem nut coupled to the valve stem shaft is required, the stem nut is removed while the parts inside the housing including the housing forming the outer shape of the bi-directional thrust and displacement compensation reducer are completely disassembled. need to be replaced Accordingly, it is difficult to replace the stem nut.

And customers want a compact bi-directional thrust and displacement compensation reducer with the same performance while having a small size. Accordingly, it is necessary to develop a structure for a bi-directional thrust and displacement compensation reducer for small-sized manufacturing.

The present applicant filed an application for a bi-directional thrust and displacement compensation reducer through Korean Registration Application No. 10-1676783 (2016.11.10) and Korean Registration Application No. 10-2244723 (2021.04.21), but the bi-directional thrust and displacement In the case of a compensating reducer, it is difficult to replace the stem nut and there is a limit to small-sized manufacturing.

Therefore, it is necessary to research and develop a variety of bi-directional thrust and displacement compensating reducers that can be easily replaced with stem nuts and can be manufactured in a small size.

A technical problem of the present invention for solving the above problems is to provide a bi-directional thrust and displacement compensation reducer that can be easily replaced with a stem nut and can be manufactured in a small size.

In order to achieve the above technical problem, one embodiment of the present invention is a first housing; a drive sleeve rotatably shaft-supported inside the first housing; a reduction unit transmitting rotational force to the drive sleeve; a second housing provided below the first housing and coupled to the first housing; an external stem nut provided in the second housing and receiving rotational force from the drive sleeve; an elastic assembly provided in the second housing and compressed or expanded according to a position change of the external stem nut; an inner stem nut provided inside the outer stem nut and screwed with a valve stem shaft extending from the valve body; and a stem nut support fixing portion coupled to a lower end of the outer stem nut and preventing the inner stem nut from being separated from the outer stem nut, wherein an upper end of the inner stem nut is formed inside the outer stem nut. It provides a bi-directional thrust and displacement compensation reducer that is supported and fixed to the stepped support portion, and the lower end of the inner stem nut is supported and fixed to the stem nut support and fixing portion.

In one embodiment of the present invention, when the stem nut support fixing part is separated from the external stem nut, the internal stem nut may be drawn out of the second housing.

In one embodiment of the present invention, the elastic assembly includes a pressing elastic member having a plurality of elastic members disposed adjacent to each other on the upper and lower sides of which contact pressure is made on the inclined surface; an upper support member having an inner surface surrounding an outer surface of the external stem nut and supporting an upper end of the pressure elastic member; and a lower support member having an inner surface surrounding an outer surface of the external stem nut and supporting a lower end of the pressurized elastic member.

In one embodiment of the present invention, the pressing elastic member, the inner surface is supported by the upper support member or the lower support member, the outer surface is a plurality of first elastic members formed with a first inclined surface; and a plurality of second elastic members alternately provided with the first elastic member, wherein the inner surface has a second inclined surface that is pressed in contact with the first inclined surface, and includes a plurality of second elastic members alternately provided with the first elastic member and the second elastic member. During compression, a contact area between the first inclined surface and the second inclined surface may be widened.

In one embodiment of the present invention, the lower support member, the inner surface is wrapped around the outer surface of the external stem nut, the outer surface is a first support guide member for supporting the first elastic member; a second support guide member extending from the first support guide member; and a protruding support member protruding from the first support guide member and supporting a lower end of the pressing elastic member.

In one embodiment of the present invention, when the valve body thermally expands, the pressure transmission member provided in the stem nut support fixing part presses the lower end of the second support guide member, and the pressure transmission member and the second Contact surfaces that the support guide members come into contact with may correspond to each other.

In one embodiment of the present invention, the deceleration unit, the input side housing; an input shaft inserted into a guide hole formed in the input side housing and supplied with power through an operation handle coupled to one end; an input sun gear provided at the other end of the input shaft; a first carrier selectively meshed with the input sun gear by the input shaft moving along the length direction of the guide hole; a plurality of first planetary gears that are selectively engaged with the input sun gear by the input shaft moving along the length of the guide hole, rotate as the input sun gear rotates, and revolve around the input sun gear; a second carrier supporting the first planetary gear together with the first carrier; a connection-side housing coupled to the input shaft housing and having a first ring gear meshed with the first planetary gear formed therein; a connecting shaft having one end coupled to the second carrier and rotating together with the second carrier; an output sun gear provided at the other end of the connecting shaft; a plurality of second planetary gears meshed with the output sun gear, rotated according to the rotation of the output sun gear, and revolved around the output sun gear; an output side housing coupled to the connection side housing and having a second ring gear meshed with the second planetary gear formed therein; and a third carrier that supports the second planetary gear, rotates along with the rotation of the second planetary gear, and is coupled with a power transmission unit that transmits power to the drive sleeve.

The effects of the bi-directional thrust and displacement compensation reducer according to the present invention described above are as follows.

According to the present invention, the stem nut support fixture is coupled to the outer stem nut and is made to support the inner stem nut. The stem nut support fixture is detachable from the external stem nut, so that when the stem nut support fixture is separated from the external stem nut, the internal stem nut provided inside the external stem nut can be easily drawn out of the second housing. can Therefore, when replacement of the inner stem nut screwed with the valve stem shaft is required, the operator can easily replace the inner stem nut.

According to the present invention, it is possible to miniaturize the bidirectional thrust and displacement compensating reducer through structural changes in the elastic assembly.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a perspective view of a bidirectional thrust and displacement compensation reducer according to an embodiment of the present invention.

2 is a cutaway perspective view of a bi-directional thrust and displacement compensation reducer according to an embodiment of the present invention.

3 is an exploded perspective view of a drive sleeve and an external stem nut according to an embodiment of the present invention.

4 is an exploded perspective view of an external stem nut, an internal stem nut, and a stem nut support fixture according to an embodiment of the present invention.

5 is a cross-sectional view of an outer stem nut, an inner stem nut, a stem nut support fixture, and an elastic assembly according to an embodiment of the present invention.

Figure 6 is a cut-away perspective view of an elastic assembly according to an embodiment of the present invention.

7 is an operating state diagram of a bi-directional thrust and displacement compensation reducer according to an embodiment of the present invention.

8 is a cross-sectional view of a bidirectional thrust and displacement compensation reducer according to an embodiment of the present invention.

9 is an exemplary operation diagram of a deceleration unit in a state in which a locking pin is inserted into a first locking groove according to an embodiment of the present invention.

10 is an exemplary operation diagram of a deceleration unit in a state in which a locking pin is inserted into a second locking groove according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another member interposed therebetween. . In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

In the present invention, the upper and lower parts mean that they are located above or below the object member, and do not necessarily mean that they are located above or below the gravitational direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a bi-directional thrust and displacement compensation reducer according to an embodiment of the present invention, FIG. 2 is a cut-away perspective view of a bi-directional thrust and displacement compensation reducer according to an embodiment of the present invention, and FIG. An exploded perspective view of a drive sleeve and an external stem nut according to an embodiment, FIG. 4 is an exploded perspective view of an external stem nut, an internal stem nut, and a stem nut support fixture according to an embodiment of the present invention, and FIG. A cross-sectional view of an external stem nut, an internal stem nut, a stem nut support fixture, and an elastic assembly according to an embodiment, FIG. 6 is a cutaway perspective view of an elastic assembly according to an embodiment of the present invention, and FIG. An operating state diagram of a bi-directional thrust and displacement compensation reducer according to an embodiment, Figure 8 is a cross-sectional view of a bi-directional thrust and displacement compensation reducer according to an embodiment of the present invention, Figure 9 is a first jam according to an embodiment of the present invention 10 is an exemplary view of the operation of the deceleration unit in a state in which the locking pin is inserted into the groove, and FIG.

As shown in FIGS. 1 to 10 , the bi-directional thrust and displacement compensation reducer 1000 is configured to control the opening and closing operation of a valve body (not shown) that opens and closes a pipeline. Such a valve body may be heated or cooled by the fluid moving inside the conduit.

The valve stem shaft provided in the valve body is screwed with the internal stem nut 700 provided in the bi-directional thrust and displacement compensating reducer 1000. Thus, the bi-directional thrust and displacement compensating reducer 1000 can selectively control the opening and closing of the pipeline by moving the valve body upward and downward through the rotation of the internal stem nut 700. For reference, the configuration of the reduction unit 300 is not shown in FIGS. 1 to 7, and the configuration of the reduction unit 300 configured to conveniently adjust the reduction ratio can be confirmed through FIGS. 8 to 10.

The bi-directional thrust and displacement compensating reducer 1000 includes a first housing 100, a second housing 200, a reduction unit 300, a drive sleeve 400, an external stem nut 500, and an elastic assembly 600. , the inner stem nut 700 and the stem nut support fixing part 800 may be included.

Here, the first housing 100 and the second housing 200 form the outer shape of the bidirectional thrust and displacement compensating reducer 1000 . The first housing 100 and the second housing 200 may be integrally coupled through fastening members such as bolts and nuts.

Various components may be provided inside the first housing 100 and the second housing 200 as described above.

Here, the drive sleeve 400 is provided inside the first housing 100 . The drive sleeve 400 transmits the rotational force transmitted from the reduction part 300 to the external stem nut 500.

The upper surface of the drive sleeve 400 is gear-coupled with the end of the power transmission unit 393 provided in the reduction unit 300, and the drive sleeve 400 can be rotated through the rotation of the power transmission unit 393. . At this time, the power transmission unit 393 and the drive sleeve 400 may be coupled in the form of a bevel gear. The drive sleeve 400 may be rotatably supported inside the first housing 100 by the sleeve support bearing 110 .

Also, since the drive sleeve 400 is hollow, the upper portion of the external stem nut 500 may be inserted into the lower center of the drive sleeve 400 . Internally toothed splines 410 are formed on the lower inner circumferential surface of the drive sleeve 400, and external toothed splines 510 are formed on the upper outer circumferential surface of the external stem nut 500. Here, when the external stem nut 500 is inserted into the drive sleeve 400, the internal tooth spline 410 and the external tooth spline 510 are engaged. Accordingly, the external stem nut 500 rotates together with the drive sleeve 400 .

The external stem nut 500 is made to be able to slide in the axial direction of the drive sleeve 400 when the valve body undergoes thermal contraction or thermal expansion due to temperature change, for example.

Here, at normal times, the external stem nut 500 rotatably supported by the first bearing support part 210 and the second bearing support part 220 exists in a normal state with a preload set higher than the valve thrust through the elastic assembly 600. , the rotational force can be transmitted in the order of the reduction part 300, the drive sleeve 400, the external stem nut 500, and the internal stem nut 700.

When the inner stem nut 700 rotates through the process of transmitting the rotational force, the valve body screwed with the inner stem nut 700 opens and closes the pipeline while moving up and down.

The external stem nut 500 may be a tubular block having a hollow interior into which a valve stem shaft is inserted. A flange portion 520 is formed on an outer circumferential surface of the external stem nut 500 , and the flange portion 520 may be supported by the first bearing support base 230 .

Here, as the upper end of the external stem nut 500 and the lower end of the drive sleeve 400 are splined, the external stem nut 500 can move up and down even in the process of receiving rotational force from the drive sleeve 400. can

Meanwhile, the elastic assembly 600 is provided in the second housing 200 . This elastic assembly 600 is installed along the outer circumference of the outer stem nut 500 . Such an elastic assembly 600 may be compressed or stretched in the process of correcting the position of the external stem nut 500 .

The elastic assembly 600 may include a pressure elastic member 610, an upper support member 620 and a lower support member 630.

Here, the elastic force of the pressing elastic member 610 may be adjusted through contact pressure between the inclined surfaces formed on the elastic members disposed adjacent to each other in the upper and lower directions.

The pressure elastic member 610 may include a first elastic member 611 and a second elastic member 612 . The first elastic member 611 and the second elastic member 612 are provided alternately.

Here, the inner surface of the first elastic member 611 is made to be supported by the upper support member 620 or the lower support member 630 . And, the outer surface of the first elastic member 611 is formed with a first inclined surface 613 that is pressed into contact with the second inclined surface 614 formed on the second elastic member 612 .

And, the inner surface of the second elastic member 612 is formed with a second inclined surface 614 that is pressed into contact with the first inclined surface 613 .

Such a first elastic member 611 and the second elastic member 612, for example, when the elastic assembly 600 is applied from the outside, the first elastic member 611 and the second elastic member 612 is compressed, and the contact area between the first inclined surface 613 and the second inclined surface 614 is widened. As such, as the contact area between the first inclined surface 613 and the second inclined surface 614 increases, the pressing force applied to the elastic assembly 600 may increase.

In addition, the inner surface of the upper support member 620 surrounds the outer surface of the external stem nut 500 and supports the upper end of the pressurizing elastic member 610 .

And the lower support member 630 is made to support the pressure elastic member 610 together with the upper support member 620. The inner surface of the lower support member 630 surrounds the outer surface of the external stem nut 500 and supports the lower end of the pressurized elastic member 610 .

The upper support member 620 and the lower support member 630 transmit externally applied pressing force to the pressing elastic member 610 . The upper support member 620 and the lower support member 630 prevent shaking of the pressurized elastic member 610 when the elastic deformation of the pressurized elastic member 610 is made, and the pressurized elastic member 610 is stably elastically deformed. 610) will be supported.

The bi-directional thrust and displacement compensation reducer 1000 can be miniaturized compared to the conventional bi-directional thrust and displacement compensation reducer equipped with a disk spring through structural changes in the elastic assembly 600 . That is, the size of the finally manufactured bi-directional thrust and displacement compensation reducer 1000 can be miniaturized.

Meanwhile, the lower support member 630 supporting the lower portion of the pressurized elastic member 610 may include a first support guide member 631 , a second support guide member 632 , and a protruding support member 633 .

Here, the inner surface of the first support guide member 631 surrounds the outer surface of the external stem nut 500 . Also, the protruding support member 633 protrudes from the first support guide member 631 and supports the lower end of the pressing elastic member 610 . The first support guide member 631 guides the moving direction of the pressurized elastic member 610 when elastic deformation of the pressurized elastic member 610 occurs. The outer surface of the first support guide member 631 and the protruding support member 633 are configured to stably support the pressing elastic member 610 .

And the second support guide member 632 extends from the first support guide member 631 . The second support guide member 632 is configured to receive a pressing force from the pressure transmission member 810 provided in the stem nut support fixing part 800 when the valve body thermally expands, for example.

For reference, looking at the operation process of the bi-directional thrust and displacement compensation reducer 1000 when the valve body is thermally expanded through FIG. 7, the bi-directional thrust and displacement compensation reducer 1000 is shown in FIG. Displacement correction is made in the form of b).

Referring to FIG. 7 , the internal stem nut 700 screwed with the valve stem shaft is moved upward toward the first housing 100 by the valve stem shaft. At this time, the external stem nut 500 combined with the internal stem nut 700 also moves upward along with the internal stem nut 700 .

Here, the stem nut support fixing part 800 integrally coupled with the external stem nut 500 through a fastening member such as a bolt also moves upward along with the external stem nut 500 . While the stem nut support and fixing part 800 moves upward, the pressure transmission member 810 provided in the stem nut supporting and fixing part 800 presses the lower end of the second support guide member 632 . In this process, the pressing elastic member 610 is elastically pressed, and the displacement of the valve body according to the temperature change can be compensated.

Here, the contact surface where the pressure transmission member 810 and the second support guide member 632 come into contact is made to correspond to each other, so that the pressure transmission force is transmitted from the pressure transmission member 810 to the second support guide member 632, so that the entire contact surface Pressing force can be transmitted uniformly.

In addition, the stem nut support fixing part 800 is coupled to the lower end of the external stem nut 500, and prevents the internal stem nut 700 provided inside the external stem nut 500 from being separated from the external stem nut 500. made to prevent Here, a fastening hole 501 is formed at the lower end of the external stem nut 500, and the stem nut support fixing part 800 can be coupled to the lower end of the external stem nut 500 through a fastening member such as a bolt. there is.

Here, as the inner stem nut 700 is inserted into the hollow formed in the outer stem nut 500, the upper end of the inner stem nut 700 is supported and fixed to the step support 530 formed inside the outer stem nut 500 , The lower end of the inner stem nut 700 is supported and fixed to the stem nut support fixing part 800, so that the inner stem nut 700 can be fixed inside the outer stem nut 500.

Here, the first engagement line 710 is formed on the lower outer circumferential surface of the inner stem nut 700, the second engagement line 540 is formed on the lower inner circumferential surface of the outer stem nut 500, and the first engagement line 710 and the second meshing line 540 may be meshed. Accordingly, when the outer stem nut 500 rotates, the inner stem nut 700 may also rotate.

And in the second housing 200, the first bearing support part 210 provided on the upper side of the elastic assembly 600 and the second bearing support part 220 provided on the lower side of the elastic assembly 600 externally The stem nut 500 and the inner stem nut 700 can rotate independently from the second housing 200 .

On the other hand, since the stem nut support fixing part 800 is detachable through the external stem nut 500 and a fastening member such as a bolt, when the internal stem nut 700 is damaged or needs to be replaced, the operator can use the second Without disassembling various components provided in the second housing 200, including the housing 200, in a state in which the stem nut support fixing part 800 is separated from the external stem nut 500, only the internal stem nut 700 is attached to the second housing 200. It can be easily pulled out of the housing 200. Therefore, when replacing the inner stem nut 700, the replacement work can be easily performed.

8 to 10, the reduction unit 300 includes an input side housing 301, a connection side housing 302, an output side housing 303, an input shaft 310, an input sun gear 320, and a first carrier 330. ), a first planetary gear 340, a second carrier 350, a connecting shaft 360, an output sun gear 370, a second planetary gear 380, and a third carrier 390.

Here, the input-side housing 301, the connection-side housing 302, and the output-side housing 303 are connected and form the outer shape of the reduction part 300.

A guide hole 304 is formed in the input housing 301, and the input shaft 310 is inserted into the guide hole 304.

Here, the input shaft 310 is made movable along the longitudinal direction of the guide hole 304 .

Also, an operating handle (not shown) may be detachable from one end of the input shaft 310 . In a state where the operation handle is coupled to one end of the input shaft 310, the user can provide power to the input shaft 310 through rotation of the operation handle.

An input sun gear 320 is provided at the other end of the input shaft 310 . The input sun gear 320 is formed integrally with the input shaft 310 and rotates in the same way as the input shaft 310 .

Such an input sun gear 320 may be engaged with the first carrier 330 or the first planetary gear 340 according to the movement state of the input shaft 310 moving along the length direction of the guide hole 304. It could be.

Specifically, a first locking groove 311 and a second locking groove 312 forming a predetermined interval along the length direction of the input shaft 310 are formed on the input shaft 310 . At this time, the first locking groove 311 and the second locking groove 312 are formed on the outer circumferential surface of the input shaft 310 .

In this way, while the input shaft 310 having the first locking groove 311 and the second locking groove 312 is moved along the length direction of the guide hole 304, the locking pin 313 is the first locking groove ( 311) or is selectively inserted into the second locking groove 312, and is configured to control the movement of the input shaft 310.

For example, as shown in FIG. 9 , when the input shaft 310 is moved while the locking pin 313 is inserted into the first locking groove 311, the input sun gear 320 provided at the other end of the input shaft 310 is formed in a meshed state with the first carrier 330. 10, when the input shaft 310 is moved while the locking pin 313 is inserted into the second locking groove 312, the input sun gear 320 provided at the other end of the input shaft 310 It achieves a meshed state with the first planetary gear 340.

Here, when the input shaft 310 is to be moved along the length direction of the guide hole 304 in a state where the locking pin 313 is inserted into the first locking groove 311 or the second locking groove 312, a certain or more The input shaft 310 can be moved only when force is applied.

In this way, the input sun gear 320 may be selectively engaged with the first carrier 330 or the first planetary gear 340 according to the movement state of the input shaft 310 moving along the length direction of the guide hole 304. there is.

Here, when the input sun gear 320 is meshed with the first carrier 330, the rotation of the input sun gear 320 and the rotation of the first carrier 330 are identical. That is, the input sun gear 320 and the first carrier 330 rotate together.

In addition, when the input sun gear 320 is meshed with the first planet gear 340, the first planet gear 340 rotates according to the rotation of the input sun gear 320 and revolves around the input sun gear 320. done to do At this time, the first planetary gears 340 may be provided in plurality at predetermined intervals.

In this way, through the rotation of the input sun gear 320, the first planetary gear 340 revolves around the input sun gear 320, and together with the rotation of the first planetary gear 340, the first planetary gear 340 The second carrier 350 supporting the also rotates together. At this time, the second carrier 350 rotates the same as the rotation of the first planetary gear 340 revolving around the input sun gear 320 .

The second carrier 350 and the first carrier 330 support the plurality of first planetary gears 340 through the first support pins 351 . Here, the first carrier 330 and the second carrier 350 are integrally formed.

In this way, when the input shaft 310 is engaged with the first carrier 330, the first carrier 330 and the second carrier 350 rotate in the same manner as the input shaft 310. In this case, separate deceleration is not performed while the first carrier 330 and the second carrier 350 are rotated from the input shaft 310 .

Unlike this, when the input shaft 310 is meshed with the first planetary gear 340, the first carrier 330 and the second carrier 350 rotate according to the revolution of the first planetary gear 340. , deceleration is made for the rotational power provided from the input shaft 310.

In other words, the user can adjust the deceleration by selectively moving the input shaft 310 .

Meanwhile, the connection-side housing 302 is coupled to the input-side housing 301 . A first ring gear 305 meshed with the first planetary gear 340 is formed inside the connection-side housing 302, and the first planetary gear 340 rotates around the input sun gear 320 as the center. can be idle

And one end of the connection shaft 360 is coupled to the second carrier 350 . This connecting shaft 360 is made to rotate in the same way as the second carrier 350 .

Also, an output sun gear 370 is provided at the other end of the connecting shaft 360 .

Such an output sun gear 370 is meshed with a plurality of second planetary gears 380 provided on the outside. Therefore, when the output sun gear 370 rotates, the plurality of second planetary gears 380 rotate on their own and revolve around the output sun gear 370.

Here, the output side housing 303 is coupled to the connection side housing 302, and a second ring gear 306 meshed with the second planetary gear 380 is formed on the inside.

Also, the third carrier 390 supports the plurality of second planetary gears 380 through the second support pins 391 . The output shaft 392 provided on the third carrier 390 rotates along with the revolution of the second planetary gear 380, and provides the reduced rotational power to the power transmission unit 393.

In this way, the reduction unit 300 can selectively adjust the dual reduction ratio through the movement of the input shaft 310 . That is, in a state in which the input shaft 310 is engaged with the first carrier 330, only one-stage reduction is performed by the output sun gear 370 and the second planetary gear 380, and the input shaft 310 is the first planetary gear ( 340), one-stage reduction by the output sun gear 370 and the second planet gear 380 and two-stage reduction by the input sun gear 320 and the first planet gear 340 can be achieved.

In addition, since the input shaft 310 and the output shaft 392 connected to the third carrier 390 are positioned on a virtual coaxial axis, the reduction unit 300 has a simple structure and can be miniaturized. In addition, the reduction ratio can be easily adjusted only by moving the input shaft 310 .

However, this is only a preferred embodiment of the present invention, and the scope of the present invention is not limited by the description scope of these embodiments.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

a first housing;

a drive sleeve rotatably shaft-supported inside the first housing;

a reduction unit transmitting rotational force to the drive sleeve;

a second housing provided below the first housing and coupled to the first housing;

an external stem nut provided in the second housing and receiving rotational force from the drive sleeve;

an elastic assembly provided in the second housing and compressed or expanded according to a position change of the external stem nut;

an inner stem nut provided inside the outer stem nut and screwed with a valve stem shaft extending from the valve body; and

A stem nut support fixing portion coupled to the lower end of the outer stem nut and preventing the inner stem nut from being separated from the outer stem nut;

The bi-directional thrust and displacement compensation reducer, wherein the upper end of the inner stem nut is supported and fixed to the step support formed inside the outer stem nut, and the lower end of the inner stem nut is supported and fixed to the stem nut support and fixing part.
According to claim 1,

The bidirectional thrust and displacement compensating reducer, characterized in that, when the stem nut support fixing part is separated from the external stem nut, the internal stem nut is drawn out of the second housing.
According to claim 1,

The elastic assembly,

a pressing elastic member having a plurality of elastic members disposed adjacent to each other on the upper and lower sides of which the inclined surface is contacted and pressurized;

an upper support member having an inner surface surrounding an outer surface of the external stem nut and supporting an upper end of the pressure elastic member; and

The bi-directional thrust and displacement compensation reducer, characterized in that the inner surface includes a lower support member that surrounds the outer surface of the outer stem nut and supports the lower end of the pressurized elastic member.
According to claim 3,

The pressure elastic member,

a plurality of first elastic members having an inner surface supported by the upper support member or the lower support member, and an outer surface having a first inclined surface; and

The inner surface is formed with a second inclined surface that is pressed in contact with the first inclined surface, and includes a plurality of second elastic members alternately provided with the first elastic member,

When the first elastic member and the second elastic member are compressed, the contact area between the first inclined surface and the second inclined surface is widened.
According to claim 4,

The lower support member,

a first support guide member having an inner surface surrounding an outer surface of the external stem nut and an outer surface supporting the first elastic member;

a second support guide member extending from the first support guide member; and

The bi-directional thrust and displacement compensation reducer comprising a protruding support member protruding from the first support guide member and supporting a lower end of the pressurized elastic member.
According to claim 5,

When the valve body thermally expands, the pressure transmission member provided in the stem nut support fixing part presses the lower end of the second support guide member,

The bi-directional thrust and displacement compensation reducer, characterized in that the contact surface where the pressure transmission member and the second support guide member come into contact are made to correspond.
According to claim 1,

The deceleration part,

input side housing;

an input shaft inserted into a guide hole formed in the input side housing and supplied with power through an operating handle coupled to one end;

an input sun gear provided at the other end of the input shaft;

a first carrier selectively engaged with the input sun gear by the input shaft moving along the length direction of the guide hole;

a plurality of first planetary gears that are selectively meshed with the input sun gear by the input shaft moving along the length of the guide hole, rotate as the input sun gear rotates, and revolve around the input sun gear;

a second carrier supporting the first planetary gear together with the first carrier;

a connection-side housing coupled to the input shaft housing and having a first ring gear meshed with the first planetary gear formed therein;

a connecting shaft having one end coupled to the second carrier and rotating together with the second carrier;

an output sun gear provided at the other end of the connecting shaft;

a plurality of second planetary gears engaged with the output sun gear, rotated according to the rotation of the output sun gear, and revolved around the output sun gear;

an output side housing coupled to the connection side housing and having a second ring gear meshed with the second planetary gear formed therein; and

Bi-directional thrust and displacement correction reducer comprising a third carrier supporting the second planetary gear, rotating along with the revolution of the second planetary gear and coupled with a power transmission unit for transmitting power to the drive sleeve .