KR102474864B1 - Joint seal structure - Google Patents

Abstract

The present invention relates to a joint sealing structure and, more specifically, to a joint sealing structure installed in a universal joint connecting a first shaft and a second shaft with each other. The joint sealing structure can be surely sealed by a simple structure. The joint sealing structure includes: the first shaft having a first groove formed on the outer circumference in a circumferential direction and a first center protrusion protruding from the bottom of the first groove in a radial direction; a joint sheath including a cylindrical sheath body covering the universal joint, a pair of first anchors inserted into the first groove by protruding from the inner surface of the sheath body and arranged on both sides of the center protrusion, and a pair of the first outer protrusions protruding from the outer surface of the sheath body at a position corresponding to the pair of first anchors; and a ring-shaped first pressurizing unit enclosing the joint sheath and pressurizing a first outer protrusion so that a first anchor is compressed and attached to the inner surface of the first groove. The pair of first outer protrusions comprise: a first compression protrusion compressing and attaching the anchor to the inner surface of the first groove by being attached to the inner surface of the first pressurizing unit; and a first guide protrusion guiding the position of the first pressurizing unit by being in contact with the edge of an end of the first pressurizing unit so that the first pressurizing unit does not horizontally move in an axial direction of the first shaft becoming far from the compression protrusion.

Description

Joint seal structure

The present invention relates to a joint sealing structure, and more particularly, to a joint sealing structure in which the number of parts is reduced and can be easily installed and disassembled without a separate tool.

There are several types of shaft coupling methods for transmitting the rotational torque provided from the driving source to the driven shaft. Among them, the universal joint is a shaft joint method used when the centers of rotation of the drive shaft and the driven shaft do not coincide.

In general, a universal joint is a shaft joint method used when the central axes of two shafts cross at an angle of about 30 degrees at most, and has a structure in which a cross-shaped pin is placed between the two shafts and the two shafts are connected to the cross-shaped pin, respectively. , It has a structure in which a socket is provided on one of the two shafts and a ball joint inserted into the other shaft is formed to connect the two shafts by a connecting pin.

In the universal joint, a space for rotation is formed between a drive shaft and a driven shaft, and a lubricant is provided in the space to prevent wear and the like while reducing mechanical friction. In addition, since the universal joint is rotated in a liquid such as sludge, when the liquid penetrates into the universal joint, the lubricant escapes and ultimately deteriorates mechanical properties.

In order to solve this problem, a sealing structure is known in which a joint sheath is assembled to enclose and seal the universal joint so that the lubricant provided inside the universal joint does not escape to the outside, and both ends of the joint sheath are tied with metal ties.

Such a universal joint has a lifespan and may require assembly and disassembly. In order to assemble and disassemble the joint sheath to the universal joint, it is necessary to assemble and disassemble the metal tie, but a separate dedicated tool is required for this, which makes the work difficult.

In addition, a pressure ring capable of disassembling and assembling without a separate tool is also known, but such a pressure ring has a large number of parts, which increases overall cost and makes maintenance difficult. In addition, there is a problem in that the pressure ring cannot reliably bring the joint sheath into close contact with the shaft.

The present invention has been created to solve the above problems, and more specifically, has a technical purpose to provide a joint sealing structure capable of disassembling and assembling without the need for special tools.

The present invention was created to solve the above problems, and the technical purpose is to reduce the number of parts to reduce the overall manufacturing cost, facilitate maintenance, and provide a joint sealing structure that increases airtightness even with a small number of parts. .

The joint sealing structure of the present invention for solving the above problems is

A joint sealing structure installed in a universal joint connecting a first shaft and a second shaft to each other,

a first shaft having a first groove formed on an outer circumferential surface along a circumferential direction and a first central projection protruding in a radial direction from a bottom surface of the first groove;

A cylindrical sheath body provided to cover the universal joint;

A pair of first anchors protruding from the inner surface of the sheath body and inserted into the first groove and disposed on both sides of the central protrusion;

a joint sheath including a pair of first outer protrusions protruding from an outer surface of the sheath body at positions corresponding to the pair of first anchors; and

A ring-shaped first pressing means disposed to surround the joint sheath and pressurizing the first outer protrusion so that the first anchor presses and adheres to the inner surface of the first groove;

The pair of first lateral projections,

A first compression protrusion that is in close contact with the inner surface of the first pressing means and compressively adheres the anchor to the inner surface of the first groove;

It consists of a first guide protrusion contacting an end edge of the first pressing means to guide the position of the first pressing means so that the first pressing means does not horizontally move in the axial direction of the first shaft away from the compression projection.

In the joint sealing structure,

The first shaft has a socket formed at an end,

The second shaft may be partially inserted into the socket and connected to the first shaft by a connecting pin.

In the joint sealing structure,

A second guide protrusion is provided on the sheath body at a position spaced apart from the first guide protrusion along the axial direction of the first shaft,

A connecting pin is disposed between the first guide protrusion and the second guide protrusion,

One edge of the first pressing means is in contact with the first guide protrusion, and the other edge of the first pressing means is in contact with the second guide protrusion, so that the first pressing means is positioned between the first guide protrusion and the second guide protrusion. It can be.

In the joint sealing structure,

A second groove is formed on an outer circumferential surface of the first shaft corresponding to the second guide protrusion,

A second anchor inserted into the second groove may be provided on an inner surface of the sheath body corresponding to the second guide protrusion.

In the joint sealing structure,

The height of the first central projection is equal to the height of the anchor, so that the first central projection may contact the inner surface of the sheath body.

The inner diameter of the first pressing means is larger than the outer diameter of the sheath body,

A retaining protrusion contacting an inner surface of the first pressing means may be formed at a position corresponding to the connecting pin on the outer circumferential surface of the sheath body.

In the joint sealing structure,

The second shaft has a third groove formed along an outer circumferential surface in a circumferential direction and a third central projection protruding in a radial direction from a bottom surface of the third groove,

In the sheath body,

A pair of third anchors protruding from the inner surface of the sheath body and inserted into the third groove and disposed on both sides of the central protrusion;

A pair of third outer projections protruding from the outer surface of the sheath body are provided at positions corresponding to the pair of third anchors,

A ring-shaped second pressing means for pressing the third outer protrusion is provided around the joint sheath so that the third anchor presses and adheres to the inner surface of the third groove,

A space may be formed on an inner surface of the sheath body between the third central protrusion and the third anchor.

In the joint sealing structure,

The third outer protrusion may be pressed by the second pressing means to compress and adhere the third anchor to the inner surface of the third groove, while limiting the movement of the third pressing means along the axial direction of the second shaft.

In the joint sealing structure,

The second pressing means may be located between the pair of third outer projections.

The joint sealing structure of the present invention for achieving the above technical object is

A joint sealing structure installed in a universal joint connecting a first shaft and a second shaft to each other,

a second shaft having a third groove formed on an outer circumferential surface along a circumferential direction and a third central projection protruding radially from a bottom surface of the third groove;

A cylindrical sheath body provided to cover the universal joint of the second shaft;

A pair of third anchors protruding from the inner surface of the sheath body and inserted into the third groove and disposed on both sides of the central projection;

a joint sheath including a pair of third outer protrusions protruding from an outer surface of the sheath body at positions corresponding to the pair of third anchors; and

A ring-shaped second pressing means arranged to surround the joint sheath and pressurizing the third outer protrusion so that the third anchor presses on the inner surface of the third groove,

A space is formed on the inner surface of the sheath body between the third central projection and the third anchor.

In the joint sealing structure,

A height of the third anchor may be greater than that of the second central protrusion.

In the joint sealing structure,

The inner surface of the ring-shaped second pressing means may have a tapered shape on both side edges.

In the joint sealing structure,

The third outer projection may have an inclined surface corresponding to both side edges of the second pressing means.

In the present invention, since the pressure means for pressurizing the joint sheath presses the compression protrusion of the joint sheath and the positional movement is regulated by the guide protrusion, it is possible to ensure sealing with a simple structure.

In the present invention, the pressing means seals the joint sheath and at the same time prevents the connection pin from being separated from the joint, so the overall number of parts is reduced and the assembly work is facilitated.

1 is a view showing an example of a monopump.
Figure 2 is a view showing the shaft assembly in Figure 1;
3 is a perspective view of a joint sealing structure according to an embodiment of the present invention;
Figure 4 is a perspective view showing a state in which the joint sheath is installed in the universal joint in the joint sealing structure of Figure 3;
Figure 5 is a plan view of Figure 4;
6 is a VI-VI sectional view of FIG. 5;
7 is a view showing a state in which a first pressing means is installed in a joint sheath in the joint sealing structure of FIG. 4;
8 is a VIII-VIII sectional view of FIG. 7;
9 is a view showing a state in which a second pressing means is installed in a joint sheath in the joint sealing structure of FIG. 7;
Fig. 10 is a X-X cross-sectional view of Fig. 9;
11 is a cross-sectional view of a joint sealing structure according to another embodiment of the present invention.
12 is a cross-sectional view of a joint sealing structure according to another silsing example of the present invention.

Embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of the present disclosure. The scope of rights according to the present disclosure is not limited to the specific description of the embodiments or these embodiments presented below.

All technical terms and scientific terms used in this disclosure have meanings commonly understood by those of ordinary skill in the art to which this disclosure belongs, unless otherwise defined. All terms used in this disclosure are selected for the purpose of more clearly describing the disclosure and are not selected to limit the scope of rights according to the disclosure.

Expressions such as "comprising", "including", "having", etc. used in this disclosure are open-ended terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. (open-ended terms).

Expressions in the singular form described in this disclosure may include plural meanings unless otherwise stated, and this applies equally to expressions in the singular form described in the claims.

Expressions such as "first" and "second" used in the present disclosure are used to distinguish a plurality of elements from each other, and do not limit the order or importance of the elements.

As used in this disclosure, “axial direction” may be defined to mean a direction parallel to the axis of rotation of the shaft, “radial direction” may be defined to mean a direction away from or toward the axis of rotation, and “circumferential direction” "Direction" may be defined as meaning a direction surrounding the axial direction around the axial direction.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding elements are given the same reference numerals. In addition, in the description of the following embodiments, overlapping descriptions of the same or corresponding components may be omitted. However, omission of a description of a component does not intend that such a component is not included in an embodiment.

A shaft according to an embodiment of the present disclosure may be used in the monopump 100. At this time, the monopump can be applied to various fields such as, for example, chemicals, paints, cosmetics, paper pulp, sugar, ceramics, agriculture and fisheries, civil engineering, mining, ships, concentrated sludge, liquid chemical sludge, coagulant, oil sludge, and villages. As shown in FIGS. 1 and 2, the drive shaft 200 and the drive shaft 200 receive power from the drive shaft 200 and transmit rotation, and the shaft assembly 200 and the shaft assembly 200 surrounded by the housing It includes a rotor 10 connected to and rotating. At this time, the drive shaft 200 is connected to the motor and configured to rotate, and the shaft assembly 200 is connected to the drive shaft 100 to rotate and transmits rotational force to the rotor 10 .

When rotational force is applied from the driving shaft 200, the rotational torque is transmitted to the rotor 10 through the shaft assembly 300. At this time, the rotor 10 does not rotate on the same axis as the driving shaft, so the universal joint is It is configured to transmit power even if there is a change.

In this embodiment, "first shaft" refers to a "rotor", and "second shaft" refers to a part of a shaft of a shaft assembly connected to the rotor by a universal joint, but is not limited thereto.

In the monopump, the first shaft and the second shaft perform the function of transporting various liquids from water to high-concentration and high-viscosity liquids while rotating. Since it generates, a joint sealing structure for sealing the universal joint from the outside is applied.

The joint sealing structure 1 includes a first shaft 10, a second shaft 20, a joint sheath 30, a first pressing means 40, and a second pressing means 50.

The first shaft 10 has a socket 11 formed on one side, and a spiral portion 12 forming a spiral shape while having a three-dimensional twist shape in one direction is provided in the socket 11. The spiral part 12 of this rotor is inserted into the stator (not shown). A gap is provided between the rotor and the stator, and as the rotor rotates, a suction force is generated in the gap so that the fluid can move along the longitudinal direction of the rotor.

The socket 11 has a cylindrical shape, and a plurality of pin holes 111 into which connection pins 61 can be inserted are formed at intervals of 90 degrees in the circumferential direction on the outer circumferential surface. In the socket 11, between the pin hole 111 and the spiral portion 12, a first groove 112 is formed on the outer circumferential surface along the circumferential direction. The first groove 112 has a predetermined thickness, and at the center of the first groove 112, a first central protrusion 113 protruding in a radial direction from the bottom surface is formed along the circumferential direction.

Specifically, a first central projection 113 protruding from the central bottom surface is formed in the first groove 112, so that a pair of small grooves are spaced apart from each other in the axial direction with the first central projection 113 interposed therebetween. there will be

Inside the socket 11, an accommodation portion 114 extending inwardly from the free end and having one side open at the free end so that the end of the second shaft 20 can be inserted is provided. After the end of the second shaft 20 is inserted into the accommodating part 114, the connecting pin 61 passes through the pin hole 111 and the end of the second shaft 20 to connect the first shaft 10 and the second shaft 20 to each other. 2 Shaft 20 is jointed. The accommodating part 114 has a size slightly larger than the end of the second shaft 20 and allows the second shaft 20 to rotate while having a predetermined angle while being accommodated in the accommodating part 114.

The second shaft 20 is partially inserted into the socket 11 and connected to the first shaft 10 by a connecting pin 61, and the second shaft 20 has a spherical end at the end. A joint ball 21 is formed, and a shaft rod 22 is provided long in one direction from the joint ball 21 . The joint ball 21 is inserted into the receiving portion 114 through the open portion of the free end of the socket 11. The joint ball 21 is formed with a pin receiving hole 211 that penetrates in a direction perpendicular to the axial direction of the second shaft 20 and is disposed at a position corresponding to the pin hole 111 . The connecting pin 61 fixed to the first shaft 10 is configured to pass through the pin hole 111 and the pin receiving hole 211 . The pin receiving hole 211 is configured so that the inner diameter of the free end side of the first shaft 10 is larger in the axial direction of the first shaft than the center, enabling the angle change of the joint ball 21 with respect to the connecting pin 61 .

The shaft rod 22 has a cylindrical shape and is close to the joint ball 21, and has a third groove 221 formed along the circumferential direction on its outer circumferential surface, and a radius at the bottom of the third groove 221. A third central protrusion 222 protruding in the direction is provided. The third groove 221 is configured such that a pair of small grooves spaced apart from each other are formed along the circumferential direction by the third central protrusion 222 protruding from the center of the bottom surface.

On the other hand, the socket 11 of the first shaft 10, the joint ball 21 of the second shaft 20, and the connecting pin 61 cooperate to form the universal joint 60, and the universal joint 60 is to perform a function of rotatably connecting the first shaft 10 and the second shaft 20 on different rotational axes.

The joint sheath 30 is provided to cover the universal joint 60, and specifically, the socket 11 of the first shaft 10, the joint ball 21 of the second shaft 20, and the connecting pin. (61) is configured to be sealed from the outside. The joint sheath 30 is made of rubber and has excellent elasticity. When the first shaft 10 and the second shaft 20 rotate on different axes, the joint sheath 30 does not change the rotational angles of the first shaft 10 and the second shaft 20 and externally to prevent foreign matter from entering the interior. In addition, the joint sheath 30 also performs a function of not leaking the lubricant therein.

The joint sheath 30 includes a sheath body 31, a first anchor 32, a first outer projection 33, a second guide projection 34, a retaining projection 35, a third anchor 36, and It is configured to include a third outer projection (37).

The sheath body 31 is made of a rubber material and includes a large diameter portion 30a and a small diameter portion 30b extending from the large diameter portion 30a.

The large diameter portion 30a is configured to surround the outside of the first shaft 10 and has an inner diameter slightly larger than the outer diameter of the socket 11 of the first shaft 10 .

The small diameter portion 30b extends in one direction from the large diameter portion 30a and is configured to surround the outside of the second shaft 20, and is configured to have a smaller outer diameter than the large diameter portion 30a, and the large diameter portion ( Between 30a) and the small-diameter portion 30b, a stepped portion 30c having a reduced outer diameter is formed. The inner diameter of the small diameter portion 30b is configured to be slightly larger than the outer diameter of the second shaft 20 .

The first anchor 32 protrudes from the inner surface of the sheath body 31 and is inserted into the first groove 112 . Specifically, the first anchor 32 is disposed on both sides of the first central projection 113 with the first central projection 113 interposed in the first groove 112, and is a pair of first anchors. (32) is configured to be inserted into the first groove (112). Each of the first anchors 32 may be supported by having one side in contact with the sidewall of the first groove 112 and the other side in contact with the first central protrusion 113 .

The height at which the first anchor 32 protrudes from the inner surface of the sheath body 31 is the same as or substantially the same as the height at which the first central protrusion 113 protrudes from the bottom surface of the first groove 112. The inner surface of the body 31 is in contact with the outer surface of the first shaft 10, and the first anchor 32 is also configured to contact the bottom surface of the first groove 112.

One of the pair of first anchors 32 is disposed at a position corresponding to the first guide protrusion 332, and the other is disposed at a position corresponding to the first compression protrusion 331.

In the first anchor 32, the sheath body 31 is the outer circumferential surface of the first shaft 10 while the first pressing member is inserted in the first horizontal direction HD1 along the axial direction of the first shaft 10. It keeps it in the right position without being pushed. In addition, the first anchor 32 disposed at a position corresponding to the first compression protrusion 331 is the inner surface of the first groove 112 when the first compression protrusion 331 is pressed by the first pressing member. By being configured to be compressed and closely adhered to, sealing between the sheath body 31 and the first shaft 10 is ensured.

The first central protrusion 113 is formed between the pair of first anchors 32 so that the first anchor 32 is not excessively deformed in the process of compressing the first anchor 32 and the first groove (112) It is compressed airtightly inside. That is, the first anchor 32 can be reliably airtight inside the first groove 112 without shape collapse from side to side.

The first outer projection 33 protrudes from the outer surface of the sheath body 31 at a position corresponding to the pair of first anchors 32 .

The first outer projection 33 is in close contact with the inner surface of the first pressing means 40, and the first compression projection 331 compresses and adheres the first anchor 32 to the inner surface of the first groove 112. , The position of the first pressing means 40 so that the first pressing means 40 does not horizontally move in the axial direction of the first shaft 10 away from the compression protrusion in contact with the end edge of the first pressing means 40 It consists of a first guide protrusion 332 for guiding.

The first compression protrusion 331 protrudes radially from the outer surface of the sheath body 31 and is configured to press the first anchor 32 reliably by being pressed as a whole by the first pressing means 40. The first compression protrusion 331 has a triangular cross-sectional shape with inclined surfaces formed on both sides, so that the first pressing means 40 can be easily moved in the horizontal direction. In addition, when the first pressing means 40 is located between the first guide protrusion 332 and the second guide protrusion 34, the first compression protrusion 331 is formed on the inner surface of the first pressing means 40. It is configured to be pressed and elastically deformed in the first horizontal direction HD1.

The first guide protrusion 332 contacts the end edge of the first pressing means 40 in the axial direction of the first shaft 10 in which the first pressing means 40 moves away from the first compression protrusion 331. To guide the position of the first pressing means 40 so as not to move horizontally. The first guide protrusion 332 has a triangular cross-sectional shape with inclined surfaces formed on both sides, so that the first pressing means 40 passes with little force when the first pressing means 40 moves in the first horizontal direction. can do. It is preferable that the height of the first pressing means 40 is lower than that of the first compression protrusion 331 for ease of installation and separation. Specifically, the protruding height of the first guide protrusion 332 from the sheath body 31 is preferably smaller than the protruding height of the first compression protrusion 331 from the sheath body 31 .

When the first guide protrusion 332 is configured to contact the edge inclined surface of the first pressing means 40, unlike the first compression protrusion 331, it is preferable not to be compressed by the first pressing means 40, It is also possible to pressurize to a certain extent.

The second guide protrusion 34 is disposed at a position spaced apart from the first guide protrusion 332 in the axial direction of the first shaft 10, and the first guide with the connection pin 61 interposed therebetween. It is configured to be positioned on the opposite side of the protrusion 332 .

One edge of the first pressing means 40 may contact the first guide protrusion 332, and the other edge of the first pressing means 40 may contact the second guide protrusion 34. The first pressing means 40 is located between the first guide protrusion 332 and the second guide protrusion 34 .

Preferably, the second guide protrusion 34 has the same shape as the first guide protrusion 332 and has the same height as the first guide protrusion 332 . Specifically, it has a height enough to partially contact the first pressing means 40 at a level where the first pressing means 40 does not fall out.

The retaining protrusion 35 is in contact with the inner surface of the first pressing means 40 at a position corresponding to the connecting pin 61 on the outer circumferential surface of the sheath body 31 . The first pressing means 40 presses the first compression protrusion 331 so that the first anchor 32 presses and adheres to the inner surface of the first groove 112 to prevent external foreign substances from entering the inside and at the same time , To prevent the connection pin 61 from escaping to the outside, a certain gap is formed between the sheath body 31 and the inner surface of the first pressing means 40 so that the connection pin 61 swings in the vertical direction (VD) Therefore, in order to prevent this, a retaining protrusion 35 is formed.

The first pressing means 40 does not need to press and adhere the holding protrusion 35 toward the first shaft 10, but only needs to come into contact with the holding protrusion 35.

The third anchor 36 is disposed on the small diameter portion 30b of the sheath body 31, protrudes from the inner surface of the sheath body 31 and is inserted into the third groove 221. These third anchors 36 are disposed on both sides of the central protrusion and are provided in pairs.

A pair of the third anchors 36 are configured to be inserted into the third groove 221, respectively, with the third central projection 222 of the third groove 221 interposed therebetween. Each third anchor 36 is configured such that one side contacts the sidewall of the third groove 221 and the other side contacts the third central projection 222, so that the second pressing means 50 is configured to contact the third outer projection ( 37), the third anchor 36 is not excessively extended or bent in the horizontal direction and is compressed airtightly while maintaining its shape inside the third groove 221.

Specifically, the third anchor 36 is disposed at a position corresponding to the third outer protrusion 37, and when the third outer protrusion 37 is pressed by the second pressing means 50, it is compressed and brought into close contact with the third groove. (221) is contacted to ensure confidentiality.

The height of the third anchor 36 is greater than the height of the third central protrusion 222, so that a space 38 is formed between the pair of third anchors 36. Specifically, the space portion 38 is a space defined by the pair of third anchors 36, the third central protrusion 222, and the sheath body 31, and the space portion 38 is the second pressing means 50 ) performs a function of enabling the sheath body 31 to be elastically deformed close to the third central projection 222 when the third outer projection 37 is pressed. As the space portion 38 is elastically deformed, the second pressing means 50 that is force-fitted can be firmly coupled to the sheath body 31 .

The third outer protrusion 37 protrudes from the outer surface of the sheath body 31 at a position corresponding to the pair of third anchors 36 . The third outer projection 37 is pressed by the second pressing means 50 to compress and adhere the third anchor 36 to the inner surface of the third groove 221, while the third pressing means presses the second shaft 20. It restricts movement along the axial direction. Specifically, one of the pair of first outer protrusions 33 performs the function of compressing and adhering, and the other performs only the function of a guide, while the third outer protrusion 37 performs the function of pressing and guiding. will be performed simultaneously.

The third outer protrusion 37 has a triangular cross-sectional shape so that the second pressing means 50 can easily enter between the pair of outer protrusions.

The first pressing means 40 is disposed to surround the joint sheath 30 and presses the first outer projection 33 so that the first anchor 32 presses and adheres to the inner surface of the first groove 112. It is made in a ring shape as doing. Specifically, the first pressing means 40 may be made of a metal material or a hard plastic material, and is positioned between the first guide protrusion 332 and the second guide protrusion 34 (hereinafter referred to as "pressing position"). And, it is configured to move between the first guide protrusion 332 and a position away from the second guide protrusion 34 (hereinafter referred to as a "separation position").

In the pressing position, the first pressing means 40 presses the first extrusion projection on the inner surface so that the first anchor 32 is supported by the first central projection 113 inside the first groove 112. It is possible to secure the sealing ability reliably. In addition, by moving the first pressing means 40 from the pressing position in the axial direction of the first shaft 10, it is possible to move to the separation position. At this time, the first guide projection 332 or the second guide projection 34 is elastically deformed. making it easily movable.

Both edges of the first pressing means 40 have a tapered inner surface so that they can be moved more easily between the pressing position and the separating position. At this time, the taper angle preferably has an angle corresponding to the inclined surface of the first guide protrusion 332, the first compression protrusion 331, and the second guide protrusion 34, but is not limited thereto. It is also possible.

The first pressing means 40 pressurizes the first compression protrusion 331 to maximize airtightness and covers the connection pin 61 so that the connection pin 61 is not separated from the universal joint 60. do.

The second pressing means 50 presses the third outer protrusion 37 around the joint sheath 30 so that the third anchor 36 compresses and adheres to the inner surface of the third groove 221. have a ring shape.

The second pressing means 50 has an inner diameter smaller than that of the pair of third outer projections 37 and is located between the third outer projections 37 to elastically deform the third outer projections 37 and form a pair of It is configured to reduce the size of the space portion 38 while elastically pressing the third anchor 36 even when located between the third outer projections 37 of the.

The joint sealing structure 1 according to the present invention has the following effects.

First, FIG. 3 shows a state in which the first shaft 10 and the second shaft 20 are mutually coupled by the universal joint 60, and the joint sheath 30, the first pressing means 40, and the second pressing Means 50 will remain separate from the universal joint 60 .

To perform the sealing assembly, the joint sheath 30 is installed on the universal joint 60 as shown in FIGS. 4 to 6 . Specifically, the joint sheath 30 is installed in the universal joint 60 so that the first anchor 32 and the second anchor are inserted into the first groove 112 and the third groove 221 .

Afterwards, the first pressing means 40 is moved to the pressing position. Specifically, as shown in FIGS. 7 and 8 , the ring-shaped first pressing means 40 is installed on the large diameter portion 30a of the sheath body 31 . After passing through the second guide protrusion 34, the first pressing means 40 stops moving as its edge comes into contact with the first guide protrusion 332.

In the process of moving to the pressing position, the first compression protrusion 331 having a triangular cross-section is pushed by the first pressing means 40 and expands in the left and right directions, and at the same time, the first anchor 32 is inserted into the first groove ( 112) to press and adhere. Accordingly, the airtightness of one side of the joint sheath 30 is secured as a whole.

After that, as shown in FIGS. 9 and 10 , the second pressing means 50 is positioned between the pair of third outer projections 37 . At this time, while moving the second pressing means 50 in the horizontal direction, after passing one of the third outer projections 37 of the pair of third outer projections 37, the second pressing means 50 moves the third outer projection 37. It is placed between the outer protrusions 37. At this time, the second pressing means 50 located between the third outer projections 37 presses the sheath body 31 between the third outer projections 37 downward. Accordingly, a pair of third anchors ( 36) is surely elastically pressed into the third groove 221.

In this way, when the second pressing means 50 is installed on the joint sheath 30, the sealing of the other side of the joint sheath 30 is completed.

On the other hand, when maintenance of the sealing structure is required, the joint sheath 30 is separated from the universal joint 60 after moving the second pressing means 50 and the first pressing means 40 in the axial direction, respectively. do.

The joint sealing structure 1 according to the present invention can be modified as follows.

In the above-described embodiment, it has been exemplified that no separate anchor is installed at a position corresponding to the second guide protrusion, but is not limited thereto, and as shown in FIG. 11, the second guide protrusion ( A second groove 222' is formed on the outer circumferential surface corresponding to 34'), and is inserted into the second groove 221' on the inner surface of the sheath body 31' corresponding to the second guide protrusion 34'. A second anchor 39' may be provided. When the second anchor 39' is provided as described above, the sheath body 31 does not move in the first horizontal direction HD1 and maintains its original position during the installation and separation of the second pressing means 50. be able to

In addition, in the above-described embodiment, one pressing means is installed on the first shaft 10, but it is not limited thereto, and it is possible to install a plurality of pressing means.

Specifically, as shown in FIG. 12, the same type of sealing structure is adopted on one side and the other side of the sheath body 31, respectively. Specifically, the first pressing means 40'' is installed near the free end of the large diameter part 30a'', and the second pressing means 50'' is installed in the small diameter part 30b''. In addition, it is possible to separately install a separation prevention ring 41'' for preventing separation of the connection pin 61'' at a position corresponding to the connection pin 61''.

In the above-described embodiment, the application of the joint sealing structure according to the present invention to a monopump has been exemplified, but is not limited thereto and can be applied in various fields where a universal joint is used.

Although the present invention has been described in detail with preferred embodiments above, the present invention is not necessarily limited to these embodiments and modifications, and can be variously modified without departing from the technical spirit of the present invention.

1 ... joint sealing structure 10 ... first shaft
11 ... socket 111 ... pin hole
112... first groove 113... first central projection
114 ... receiving portion 12 ... spiral portion
20 ... Second shaft 21 ... Joint ball
211 ... pin receiving hole 22 ... shaft rod
221... third groove 222... third central projection
30 ... joint sheath 31 ... sheath body
32... first anchor 33... first outer projection
331... first compression protrusion 332... first guide protrusion
34... second guide protrusion 35... retaining protrusion
36... 3rd anchor 37... 3rd lateral process
38... space part 40... first pressurizing means
50 ... second pressurizing means 60 ... universal joint
61 ... connection pin

Claims (13)

A joint sealing structure installed in a universal joint connecting a first shaft and a second shaft to each other,
a first shaft having a first groove formed on an outer circumferential surface along a circumferential direction and a first central projection protruding in a radial direction from a bottom surface of the first groove;
A cylindrical sheath body provided to cover the universal joint;
A pair of first anchors protruding from the inner surface of the sheath body in a ring shape and inserted into the first groove and disposed on both sides of the first central protrusion;
a joint sheath including a pair of first outer protrusions protruding in a ring shape from an outer surface of the sheath body; and
A ring-shaped first pressing means arranged to surround the joint sheath and pressurizing the first outer protrusion so that the first anchor presses and adheres to the inner surface of the first groove;
The first anchor and the first outer projection are located on the same plane orthogonal to the central axis of the sheath body,
The pair of first lateral projections,
A first compression protrusion that is in close contact with the inner surface of the first pressing means and compressively adheres the first anchor to the inner surface of the first groove;
A first guide protrusion contacting the end edge of the first pressing means to guide the position of the first pressing means so that the first pressing means does not horizontally move in the axial direction of the first shaft away from the first compression projection. Joint sealing structure to be. According to claim 1,
The first shaft has a socket formed at an end,
The joint sealing structure, characterized in that the second shaft is partially inserted into the socket and connected to the first shaft by a connecting pin. According to claim 2,
A ring-shaped second guide protrusion is provided on the sheath body at a position spaced apart from the first guide protrusion along the axial direction of the first shaft,
One edge of the first pressing means is in contact with the first guide protrusion, the other edge of the first pressing means is in contact with the second guide protrusion, and the first pressing means is positioned between the first guide protrusion and the second guide protrusion. Joint sealing structure, characterized in that. According to claim 3,
A ring-shaped second groove is formed on the outer circumferential surface of the first shaft,
A ring-shaped second anchor inserted into the second groove is provided on the inner surface of the sheath body at a position facing the second groove,
The joint sealing structure, characterized in that the second guide protrusion, the second groove, and the second anchor are located on the same plane orthogonal to the central axis of the sheath body. According to claim 1,
The joint sealing structure, characterized in that the height of the first central projection is equal to the height of the first anchor, so that the first central projection is in contact with the inner surface of the sheath body. According to claim 3,
The inner diameter of the first pressing means is larger than the outer diameter of the sheath body,
A joint sealing structure, characterized in that a retaining protrusion is formed on an outer circumferential surface of the sheath body and is in contact with the inner surface of the first pressing means and is positioned between the first outer protrusion and the second guide protrusion. According to claim 2,
The second shaft has a third groove formed along an outer circumferential surface in a circumferential direction and a third central projection protruding in a radial direction from a bottom surface of the third groove,
In the sheath body,
A pair of third anchors protruding from the inner surface of the sheath body in a ring shape and inserted into the third groove and disposed on both sides of the third central projection;
A pair of third outer projections protruding in a ring shape from the outer surface of the sheath body are provided,
A ring-shaped second pressing means for pressing the third outer protrusion is provided around the joint sheath so that the third anchor presses and adheres to the inner surface of the third groove,
The third anchor and the third outer projection are located on the same plane orthogonal to the central axis of the sheath body,
Joint sealing structure, characterized in that a space portion is formed on the inner surface of the sheath body between the third central projection and the third anchor. According to claim 7,
The third outer projection is pressed by the second pressing means to compress and adhere the third anchor to the inner surface of the third groove, while restricting the movement of the second pressing means along the axial direction of the second shaft. Characterized in that Joint sealing structure. According to claim 7,
The joint sealing structure, characterized in that the second pressing means is located between the pair of third outer projections. A joint sealing structure installed in a universal joint connecting a first shaft and a second shaft to each other,
a second shaft having a third groove formed on an outer circumferential surface along a circumferential direction and a third central projection protruding radially from a bottom surface of the third groove;
A cylindrical sheath body provided to cover the universal joint of the second shaft;
A pair of third anchors protruding from the inner surface of the sheath body in a ring shape and inserted into the third groove and disposed on both sides of the third central projection;
a joint sheath including a pair of third outer protrusions protruding in a ring shape from an outer surface of the sheath body; and
A second pressing means disposed to surround the joint sheath and pressurizing the third outer protrusion so that the third anchor presses and adheres to the inner surface of the third groove,
The third anchor and the third outer projection are located on the same plane orthogonal to the central axis of the sheath body,
Joint sealing structure, characterized in that the space portion is formed on the inner surface of the sheath body between the third central projection and the third anchor. According to claim 10,
Joint sealing structure, characterized in that the height of the third anchor is greater than the third central projection. According to claim 10,
The joint sealing structure, characterized in that the inner surface of the ring-shaped second pressing means has a tapered shape on both side edges. According to claim 12,
The joint sealing structure, characterized in that the third outer projection has an inclined surface in contact with both side edges of the second pressing means.

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