KR102213834B1 - Ptfe lip seal - Google Patents

Abstract

The present invention relates to a polytetrafluoroethylene (PTFE) lip seal for a rotary shaft, which is able to form a lip with PTFE which has excellent chemical resistance, thermal resistance, and durability, to manufacture the lip seal by an insertion process, to strengthen the process easiness and stability of the lip seal, and to freely control the position of the PTFE lip. As such, according to the present invention, the PTFE lip seal for a rotary shaft comprises: a horizontal body in a ring shape, which is placed on a sealing part in a horizontal direction parallel to the rotary shaft; a vertical body connected to the horizontal body and placed vertically to the rotary shaft; a body which includes an engagement unit formed by an inner surface of the horizontal body and one side surface of the vertical body, and a mounting unit placed adjacent to the engagement unit and placed on an inner surface of the horizontal body; a lip member which is mounted on the engagement unit and is longer than the gap of the sealing part; and a fixing ring mounted on the mounting unit to pressurize and fix the lip member.

Description

PTFE lip seal for rotating shaft {PTFE LIP SEAL}

The present invention relates to a lip seal that is applied to various rotating bodies to provide sealing, and more specifically, a lip is made of PTFE (tetrafluoride polyethylene) having excellent chemical resistance, heat resistance, and durability, but the lip seal is made by a fitting process. It relates to a PTFE lip seal for a rotating shaft that enhances the ease of processing and stability of the lip seal by manufacturing and allows the position of the PTFE lip to be freely adjusted.

Since the rotating body always generates friction through rotation, lubricants are essential to reduce friction. In the case of bearings that are widely applied to rotating bodies, various bearings are used depending on their type, but the fact that lubricating oil is used is the same.

As described above, since the rotating body uses lubricating oil, it essentially needs a sealing structure that can prevent leakage of lubricating oil. Among them, a lip seal is used as the most representative sealing means.

Among the lip seals, PTFE lip made of PTFE (tetrafluoride polyethylene), which is called Teflon, has excellent chemical resistance, heat resistance, and durability, can be made thin, and is very suitable for use in rotating bodies due to its very low coefficient of friction and self-lubrication. Suitable. In addition, the PTFE lip seal has the advantage that there is little problem of explosive decompression and stick-slip, especially occurring in rubber elastomers.

In such a PTFE lip seal, the sealing force is determined by the shape restoration of the lip and the pressure of the medium, and the sealing part to be sealed is generally composed of a gap. When the seal is pressured through this gap, the lip sticks out and detaches. Since may occur, there is a need to strongly fix the lip.

The overall shape of the PTFE lip seal (S) is configured as shown in FIG. 1, and the conventional seal has a lip (L) in the insertion part (I) of the body (B) disposed on the sealing part, as shown in FIG. It is composed of a form that is fitted. These conventional seals have a limited length of the lip (L), and in particular, because the lip (L) must be forcibly coupled to the insertion part (I), it is difficult to assemble the lip (L) and insert it with excessive force. In this case, there is a problem that the lip (L) is damaged.

Another conventional seal is a gasket method in which the lip (L) is inserted into the gap resulting from the coupling of the outer body (B1) and the inner body (B2), as shown in FIG. 3, and the temperature performance is lowered by the rubber gasket. Can occur, the process is complicated, and the number of parts is large.

On the other hand, as a conventional technology for a lip seal, there is Patent Publication No. 10-2020-0021592 (March 02, 2020), which is somewhat different from the present invention regarding a PTFE lip seal, and its structure is also remarkable. It is different.

The present invention is to solve the above problems, and the lip is made of PTFE (tetrafluoride polyethylene) having excellent chemical resistance, heat resistance, and durability, but the lip seal is manufactured through a fitting process to enhance the ease and stability of the lip seal process. In addition, the purpose of this is to minimize damage to the PTFE lip, which is easily damaged, no leakage, and to freely adjust the position of the PTFE lip.

In addition, by limiting the insertion of the fixing ring for fixing the lip to an appropriate level, the purpose of preventing the problem of damage to the lip due to excessive insertion of the fixing ring in advance.

In addition, it is an object of the present invention to provide a detachment preventing means capable of preventing the lip from being detached due to various factors such as pressure or impact, and a detachment preventing structure capable of providing effective separation prevention.

The present invention for the purpose of solving the above problems is a horizontal body that has a ring shape as a whole, is disposed on the sealing part, and is disposed in a horizontal direction parallel to the rotation axis, and is connected to the horizontal body and is in a vertical direction perpendicular to the rotation axis. A body including a vertical body disposed, a coupling portion formed by an inner surface of the horizontal body and one side of the vertical body, and a mounting portion disposed adjacent to the coupling portion and provided on the inner surface of the horizontal body, and the coupling portion And a lip member mounted on and having a length longer than the gap of the sealing part, and a fixing ring mounted on the mounting part to pressurize and fix the lip member.

In addition, the horizontal body includes a stepped portion provided such that an inner diameter of an inner surface constituting the coupling portion is formed to be smaller than an inner diameter of an inner surface constituting the mounting portion, and the fixing ring is fitted to the body so that one side thereof contacts the stepped portion. It is characterized in that it can be configured to be combined.

Further, it further comprises a separation preventing means provided on the vertical body or the fixing ring to prevent separation of the lip member, wherein the separation preventing means is provided on the vertical body or the fixing ring, protruding toward the coupling portion, It is characterized in that it may include a jaw composed of a plurality of projections.

In addition, the separation preventing means may further include a nail provided on the fixing ring or the vertical body, protruding toward the coupling portion, and having a pointed end.

The present invention having the above configuration and characteristics comprises a lip of PTFE (tetrafluoride polyethylene) having excellent chemical resistance, heat resistance, and durability through a lip member that is pre-coupled to the body and a retaining ring that is then coupled, but the fitting process By manufacturing a lip seal, it has the effect of reinforcing the ease and stability of the lip seal process and minimizing damage to the PTFE lip that is easily damaged.

In addition, by fitting and coupling the fixing ring to the body, there is no oil leakage, and by changing the design of the body and different insertion positions of the fixing ring, the position of the lip member can be freely adjusted.

In addition, by providing a stepped portion on the inner side of the body so as to be caught by the stepped portion when the fixing ring is inserted, it has the effect of preventing a problem in which the lip member is damaged due to excessive insertion of the fixing ring.

In addition, a separation prevention means that prevents the separation of the lip member is provided.In particular, by configuring a separation prevention means with a jaw, a nail or a combination of both, the separation prevention means can be applied in various ways according to the situation and design specifications. It provides the effect of allowing.

1 is a view showing a general embodiment of a rotating body to which a lip seal is applied.
2 is a view showing an embodiment of a conventional lip seal.
3 is a view showing another embodiment of a conventional lip seal.
4 is a specific cross-sectional view of a lip seal according to a first embodiment of the present invention.
Figure 5 is an exploded view of a specific cross-sectional view of Figure 4;
6 to 11 are specific cross-sectional views showing the second to seventh embodiments.

The present invention will be described in detail in the text of the bar, implementation (態樣, aspect) (or embodiment) that can apply various changes and can have various forms. However, this is not intended to limit the present invention to a specific form of disclosure, and it should be understood that all changes, equivalents, and substitutes included in the spirit and scope of the present invention are included.

The terms used in the present specification are only used to describe specific embodiments (sun, 態樣, aspect) (or examples), and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as ~include~ or ~consist~ are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of being added.

Unless otherwise defined, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

The ~1~, ~2~, etc. described in the present specification will only be referred to to distinguish different constituent elements, and are not limited to the order of manufacture, and the names in the detailed description and claims of the invention It may not match.

Hereinafter, a lip seal for a rotating shaft (hereinafter, the present apparatus) according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a PTFE lip seal for a rotating shaft in which a lip seal is manufactured through a fitting process to enhance the ease and stability of the lip seal, and the position of the PTFE lip can be freely adjusted.

As shown in Figs. 4 to 11, this device has a ring shape as a whole, and largely includes a body 1, a lip member 2, and a fixing ring 3. As can be seen in Fig. 1, the device has a ring shape. For convenience of explanation, Figs. 2 to 11 show a cross-sectional view at any one location, and obviously, a cross-sectional view is shown in the center of the entire device. It may be arranged symmetrically with respect to the center, and in FIGS. 2 to 11 it can be interpreted that only one of them is shown.

In addition, FIG. 1 shows an implementation in which the present apparatus is provided to seal the gap of the bearing, but is not necessarily limited thereto, and it should be interpreted that it can be applied to all sealing parts in various products including a rotating shaft.

Specifically, for each configuration, the body 1 is a basic base of the device that seals the sealing portion, and obviously is disposed on the sealing portion.

4 to 5, such a body 1 is a horizontal body 11 arranged in a horizontal direction parallel to the rotation axis, a vertical body 11 connected to the horizontal body 11 and arranged in a vertical direction perpendicular to the rotation axis. The body 12, a coupling part 13 formed by the inner surface of the horizontal body 11 and one side of the vertical body 12, and the coupling part 13 are disposed adjacent to the inner surface of the horizontal body 11 It includes a mounting portion 14 provided.

Specifically, the horizontal body 11 is a body disposed in a horizontal direction parallel to the rotation axis of the body 1, and the lip member 2 and the fixing ring are provided on the inner surface thereof (refer to Figs. 4 to 11). (3) This fit is combined. That is, the surface of the horizontal body 11 to which the lip member 2 is fitted becomes the coupling part 13, and the surface of the horizontal body 11 to which the fixing ring 3 is fitted is the mounting part ( 14).

More specifically, as shown in FIG. 5, the horizontal body 11 includes a large diameter part 111 and a small diameter part 112, and an inclined part connecting the large diameter part 111 and the small diameter part 112 ( 113) may be provided. That is, the large-diameter portion 111 and the small-diameter portion 112 are connected by the inclined portion 113, and obviously, the inclined portion 113 is configured to be inclined in a direction in which the inner diameter decreases toward the small-diameter portion 112. The large diameter part 111 allows the fixing ring 3 to be easily inserted, and the small diameter part 112 constitutes the mounting part 14 so that the fixing ring 3 can be fitted to the body 1. do. The inclined portion 113 prevents a stepped jaw between the large-diameter portion 111 and the small-diameter portion 112 from being jammed when the fixing ring 3 is inserted.

In addition, as shown in Figure 5, the horizontal body 11 further includes a stepped portion 114 provided so that the inner diameter of the inner surface constituting the coupling portion 13 is formed smaller than the inner diameter of the inner surface constituting the mounting portion 14 It may include, and the stepped portion extends from the small diameter portion 112 and is configured to be stepped toward the center (lower side with reference to FIG. 5). The stepped portion 114 is fitted to the body 1 so that one side of the fixing ring 3, which will be described later, comes into contact, and the fixing ring 3 is fitted to the body 1 so that one side of the fixed ring 3 contacts the stepped portion 114. By acting as a stopper so that the fixing ring 3, which is inserted into the body 1, 114 is not excessively inserted, the fixing ring 3 is excessively attached toward the lip member 2 coupled to the coupling part 13. It is inserted to damage the lip member 2, or in severe cases, it is possible to prevent a problem in which the lip member 2 is damaged by the fixing ring 3.

And, as shown in Figure 5, the horizontal body 11 may further include a gradient portion 115 provided to increase the inner diameter toward the vertical body 12 side on the inner surface constituting the coupling portion 13 It is characterized. The inclined portion 115 may enhance the bonding force of the lip member 2 by allowing the end portion of the lip member 2 to be partially deformed and inserted when the coupling portion 13 of the lip member 2 is inserted.

Next, the vertical body 12, which is another configuration constituting the body 1, is a body disposed in a vertical direction perpendicular to the rotation axis, and is integrally connected with the horizontal body 11, and a lip to be described later on its side The member 2 is joined. That is, the coupling part 13 is formed by the inner surface of the horizontal body 11 and one side of the vertical body 12, where one side of the vertical body 12 may be an inner side or an outer side. . This vertical body 12 may have a length smaller than the gap of the sealing portion, because the lip member 2, which will be described later, plays a pivotal role in the sealing.

Specifically, as shown in Figure 5, the vertical body 12 is provided at the end of the vertical portion 121, which is connected to the horizontal body 11 and arranged vertically, and the vertical portion 121, and the coupling portion 13 ) May include a bent portion 122 bent toward the side. The vertical portion 121 provides a supporting force corresponding to a reaction against the pressing force by the fixing ring 3, and the bent portion 122 is positioned in the desired direction when the lip member 2 is fitted. Guide them to bend. That is, when the bent portion 122 is provided, the lip member 2 is fitted and coupled to the body 1 while being bent in the same direction as the bent portion 122.

Next, the coupling part 13 and the mounting part 14 are parts to which the lip member 2 and the fixing ring 3 are respectively mounted, and the coupling part 13 is the inner surface of the horizontal body 11 and the vertical body 12 Is formed by one side of. And the mounting portion 14 is disposed adjacent to the coupling portion 13 and is provided on the inner surface of the horizontal body (11).

The above-described body 1 may be made of a material having a predetermined rigidity, and in particular, it is preferably made of a metal material such as iron, stainless steel, aluminum, or the like.

In addition, according to the configuration of the horizontal body 11 and the vertical body 12 described above, the body 1 may have an overall'a' shape and a'T' shape, and each part of the horizontal body 11, As only a part of each part of the vertical body 12 is provided or the vertical body 12 takes a stepped structure, the partial shape may be changed.

Next, the lip member 2 is configured to seal the sealing part, and is mounted on the coupling part 13 corresponding to the boundary between the horizontal body 11 and the vertical body 12, and has a length longer than the gap between the sealing part. It bends during mounting and seals the sealing part. This is to allow the restoring force of the lip member 2 to be expressed as a fixing force of the lip member 2 as the lip member 2 is bent when the sealing portion is closed.

The lip member 2 may be made of tetrafluoride polyethylene (PTFE), which is referred to as Teflon, as a main material, and may be composed of various types of materials such as pure PTFE and PTFE containing additives.

Next, the fixing ring 3 is a configuration that fixes the lip member 2 so that it does not fall out, is mounted on the mounting portion 14 formed by the side of the horizontal body 11, and is inserted into the body 1 to fix the lip member 2 ) Is fixed by pressure. As described above, when one side of the fixing ring 3 contacts the stepped portion 114, excessive insertion is prevented, and thus the breakage of the lip member 2, which is liable to be damaged, can be effectively prevented.

Obviously, the fixing ring 3 also has a ring shape as a whole, and like the body 1, it may be made of a material having a predetermined rigidity, particularly a metal material such as iron, stainless steel, aluminum, or the like. In addition, the cross-sectional shape may be composed of a polygon.

In this device, the fixing ring 3 is inserted into the opening side (the large-diameter part 111 side) while the lip member 2 is connected to the coupling part 13 of the body 1 and is inserted into the mounting part 14. The fixing ring (3) is combined in the order in which it is installed, through which it minimizes damage to the lip member (2), which is easily damaged by external force during the force-fitting process, and the possibility of leakage of oil as the fixing ring (3) is fitted. There is no advantage.

In the above, as the lip member 2 is made of a material having low friction, it can be easily separated from the coupling portion 13, the present invention is a means for preventing the separation of the lip member 2, the separation preventing means I would like to present (4).

Specifically, as shown in Figs. 4 to 11, the device further includes a separation preventing means 4 provided on the vertical body 12 or the fixing ring 3 to prevent separation of the lip member 2 It is characterized by being able to do.

More specifically, as shown in FIGS. 4 to 11, the separation preventing means 4 is provided on the vertical body 12 or the fixing ring 3, protrudes toward the coupling part 13, and a plurality of protrusions It may include a jaw (41) consisting of.

Representatively, Fig. 7 shows an implementation in which the jaws 41 are provided on both the vertical body 12 and the fixing ring 3, through which the vertical body 12 or the fixing ring 3 is provided only at one position. It will also be possible to infer the practice.

The number of protrusions of the jaws 41 is not separately limited, and may include two or more protrusions, and the greater the number of protrusions, the better the separation prevention effect, and the smaller the number of protrusions, the loss area of the lip member 2 Because it is minimized, it is advisable to select an appropriate number and perform it.

In another embodiment, as shown in Figures 4 to 11, the separation prevention means 4 is provided on the fixing ring 3 or the vertical body 12, protrudes toward the mounting portion 14, and has a pointed end. It may further include a nail (42).

Representatively, in FIG. 8, it can be seen that the nail 42 is provided on the fixing ring 3 and the jaws 41 are provided on the vertical body 12, through which the nail 42 is fixed on the fixing ring 3 ) Or the practice provided only in one of the vertical bodies 12 or both, the jaw 41 and the nail 42 may be selected and provided at a position where they do not overlap. Or may be provided in combination.

The nail 42 has a greater degree of protrusion than the jaws 41 and has a sharply configured pointed end, which has a large separation prevention effect, but has a disadvantage in that the loss area of the lip member 2 is concentrated at any one point. It is advisable to be cautious in choosing with ).

Hereinafter, exemplary embodiments in which the respective components of the present apparatus described above are variously combined will be described with reference to the accompanying drawings.

(In the following description, the plurality of lip members 2 are respectively a first lip 21, a second lip 22, etc., and the plurality of fixing rings 3 are the first ring 31, the second ring 32 ), etc.)

First, as shown in FIG. 4, the device according to the first embodiment includes a body 1 in which the horizontal body 11 and the vertical body 12 are connected to the letter'A', and the lip coupled to the coupling part 13 It consists of a member 2 and a fixing ring 3 mounted on the mounting portion 14. The first embodiment is a basic embodiment, and the departure preventing means 4 is composed of jaws 41.

Next, as shown in Figure 6, the device according to the second embodiment, the horizontal body 11 and the vertical body 12 is connected to the'T'-shaped body (1) and the vertical body (12). The first lip 21 coupled to the inner first coupling portion 131, the second lip 22 coupled to the outer second coupling portion 132, and the inner first mounting portion based on the vertical body 12 It consists of a first ring 31 mounted on 141 and a second ring 32 mounted on the outer second mounting portion 142. In the second embodiment, it can be seen that the separation preventing means 4 is not provided, and in particular, the gradient portion 115 is formed on the coupling portion 13 side. In addition, the horizontal body 11 is characterized by not having a large diameter portion 111. In this second embodiment, the lip member 2 is configured to be bent inward and outward, respectively, so that the sealing of the inside and outside may be covered.

Next, as shown in FIG. 7, the device according to the third embodiment has a body 1 in which the horizontal body 11 and the vertical body 12 are connected with the letter'A', and is coupled to the coupling part 13 It consists of a first lip (21) and a second lip (22), a fixing ring (3) mounted on the mounting portion (14), and separation preventing means (4). In the third embodiment, in order to prevent separation of the first lip 21 and the second lip 22, respectively, the jaws 41 are used as separation preventing means 4 in both the fixing ring 3 and the vertical body 12. You can see what you have. In addition, the first lip 21 and the second lip 22 are bent inward and outward, respectively, and are mounted. In this third embodiment, not only the lip member 2 covers all of the inner and outer seals, but also the two lip members 2 can be fixed with one fixing ring 3.

Next, as shown in FIG. 8, the device according to the fourth embodiment is based on a body 1 in which the horizontal body 11 and the vertical body 12 are connected to the letter'T' and the vertical body 12. With respect to the first lip 21 coupled to the inner first coupling portion 131, the second lip 22 coupled to the outer second coupling portion 132, and the vertical body 12, the inner first mounting portion ( It consists of a first ring 31 mounted on 141, a second ring 32 mounted on the outer second mounting portion 142, and separation preventing means 4. In particular, in the fourth embodiment, the prevention of separation of the lip member 2 was reinforced, and through the jaws 41 formed on both sides of the vertical body 12 and the nail 42 formed on the side of each fixing ring 3 It can be seen that the first lip 21 and the second lip 22 are strongly supported.

Next, as shown in Figure 9, the device according to the fifth embodiment, the horizontal body 11 and the vertical body 12 is connected to the'T' shape, the vertical body 12 has a stepped body (1) ), the first lip 21 and the second lip 22 coupled to the inner first coupling portion 131 based on the vertical body 12, and the third lip coupled to the outer second coupling portion 132 (23), a first ring 31 mounted on the inner first mounting portion 141 based on the vertical body 12, a second ring 32 mounted on the outer second mounting portion 142, and a separation preventing means It consists of (4). In the fifth embodiment, three or more lip members 2 are provided by inserting a plurality of lip members 2 in one coupling part 13, and the fixing ring 3 as a detachment preventing means 4 The provided nail 42 can be checked, and in particular, it can be confirmed that the vertical body 12 has a nail 42 on the inner side and not the nail 42 on the outer side. In this fifth embodiment, the inner sealing is reinforced but the outer sealing can be performed, and the inner sealing is realized through the first lip 21 and the second lip 22 curved inward and outward, respectively. Can be seen.

Next, as shown in FIG. 10, the device according to the sixth embodiment is based on a body 1 in which the horizontal body 11 and the vertical body 12 are connected to the letter'T' and the vertical body 12. The first lip (21) and the second lip (22) coupled to the inner first coupling portion (131), the third lip (23) and fourth lip (24) coupled to the outer second coupling portion 132 , A first ring 31 mounted on the inner first mounting portion 141 based on the vertical body 12, a second ring 32 mounted on the outer second mounting portion 142, and a separation preventing means (4) Consists of In the sixth embodiment, a plurality of lip members 2 are provided in each of the plurality of coupling portions 13, the separation preventing means 4 are all composed of a nail 42, and the coupling portion 13 is provided with a plurality of lip members 2. It can be seen that the distribution 115 is provided. This sixth embodiment improves the sealing effect by realizing the sealing of each of the inner and outer sides through a plurality of lip members 2, and in particular, the number of lip members 2 is reduced by any number through the provision of four lip members 2 It implies that it can be increased.

Next, as shown in FIG. 11, in the present apparatus according to the seventh embodiment, the horizontal body 11 and the vertical body 12 are connected in a'T' shape, and a stepped end of the vertical body 12 is provided. The body 1 and the first lip 21 coupled to the inner first coupling portion 131 based on the vertical body 12, the second lip 22 coupled to the outer second coupling portion 132, With respect to the vertical body 12, the first ring 31 mounted on the inner first mounting portion 141, the second ring 32 mounted on the outer second mounting portion 142, and the separation preventing means 4 Is composed. In the seventh embodiment, each of the inner and outer separation preventing means 4 is composed of a jaw 41 and a nail 42, the jaw 41 is a vertical body 12 and the nail 42 is a fixing ring 3 And it can be seen that the cross-sectional shape is different by introducing a bent portion to the fixing ring (3), and through this, the bent portion of the fixing ring (3) plays the role of the bent portion 122 of the vertical body 12 Suggests that can be replaced. This seventh embodiment proposes a method for strengthening the sealing from the inside to the outside by configuring a plurality of lips to be bent in the same direction.

The present invention described above with reference to the accompanying drawings can be variously modified and changed by a person skilled in the art, and such modifications and changes that are not limited through the claims should be interpreted as being included in the scope of the present invention.

1: body
11: horizontal body 111: large diameter part
112: small diameter portion 113: inclined portion
114: stepped portion 115: gradient portion
12: vertical body 121: vertical portion
122: bend
13: coupling part 14: mounting part
2: lip member
3: retaining ring
4: Departure prevention means
41: encounter 42: nail

Claims (4)

In the PTFE lip seal for a rotating shaft having a ring shape as a whole,
A horizontal body 11 disposed on the sealing part and disposed in a horizontal direction parallel to the rotation axis, a vertical body 12 connected to the horizontal body 11 and disposed in a vertical direction perpendicular to the rotation axis, and the horizontal body ( 11) and a coupling portion 13 formed by one side of the vertical body 12 and a mounting portion 14 disposed adjacent to the coupling portion 13 and provided on the inner surface of the horizontal body 11 Body (1) comprising a;
A lip member (2) mounted on the coupling part (13) and having a length longer than the gap of the sealing part; And
A fixing ring (3) that is fitted to the mounting portion (14) to pressurize and fix the lip member (2);
Including,
The horizontal body 11 further includes a large diameter portion 111 and a small diameter portion 112 extending from the large diameter portion 111 toward the vertical body 12, the mounting portion 14 is the small diameter portion 112 ), and
The body 1 and the fixing ring 3 are made of a metal material having a predetermined rigidity,
The horizontal body 11 is a stepped portion formed to be stepped from the small diameter portion 112 toward the center so that the inner diameter of the inner surface constituting the coupling portion 13 is formed smaller than the inner diameter of the inner surface constituting the mounting portion 14 ( 114),
The fixing ring 3 is coupled to the body 1 by force fitting so that one side thereof contacts the stepped portion 114,
The horizontal body 11 further includes a gradient portion 115 provided on the inner surface constituting the coupling portion 14 so that the inner diameter increases toward the vertical body 12,
The fixing ring 3 is configured to be inserted into the large-diameter portion 111 and mounted on the mounting portion 14 in a state in which the lip member 2 is coupled to the coupling portion 13 of the body 1,
The fixing ring 3 has a polygonal cross-sectional shape,
Further comprising a separation preventing means (4) for preventing the separation of the lip member (2),
The separation prevention means (4) is provided on the vertical body (12), protrudes toward the coupling portion (13), and further comprises a jaw (41) consisting of a plurality of protrusions PTFE for a rotary shaft, characterized in that it further comprises Lip seal.
delete delete The method according to claim 1,
The separation preventing means (4) is provided on the fixing ring (3) or the vertical body (12), protruding toward the coupling portion (13), characterized in that it further comprises a nail (42) having a pointed end PTFE lip seal for rotating shaft.

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