WO2011132337A1

WO2011132337A1 - Sealing device

Info

Publication number: WO2011132337A1
Application number: PCT/JP2010/068657
Authority: WO
Inventors: 岳洋中川
Original assignee: Nok株式会社
Priority date: 2010-04-23
Filing date: 2010-10-22
Publication date: 2011-10-27

Abstract

In order to increase the lubrication of the sliding section (S) of a sealing lip (13), the disclosed sealing device (10), which seals a fluid containing a lubricating oil at the periphery of a horizontal rotating shaft (2), is provided with: the sealing lip (13) that, in a state facing the interior space (A) side, is slidably put in close contact with the outer peripheral surface of the rotating shaft (2) that has been inserted into the inner periphery of a housing (1); and an oil supply member (16) that extends in a manner covering the interior space (A) side of the sealing lip (13). A required number of windows (161, 162) are opened in the oil supply member (16) at a position above the sealing lip (13), and at the minor-diameter side, the end facing towards the interior space (A) approaches the outer peripheral surface of the rotating shaft (2) and has a configuration wherein a guide tube section (16d) is formed that becomes larger in diameter towards the outer peripheral side of the sealing lip (13).

Description

Sealing device

The present invention relates to a sealing device for sealing a rotating part of an automobile or other equipment with a sealing lip.

2. Description of the Related Art Conventionally, devices having a seal lip are widely known as a sealing device for sealing a fluid on the outer periphery of a rotating shaft. That is, this type of sealing device 100 includes, for example, as shown in FIG. 9, a reinforcing ring 101 having a substantially L-shaped cross section, and a synthetic resin having a rubber material or rubber-like elasticity at the outer peripheral cylindrical portion of the reinforcing ring 101. A fixed seal portion 102 formed integrally with the material, and a seal lip 103 formed integrally with the inner diameter portion of the reinforcing ring 101 with a rubber material or a synthetic resin material having rubber-like elasticity and facing the in-machine space A side; The fixed seal portion 102 is press-fitted and fixed to the inner peripheral surface of the housing 200, and the seal lip 103 is slidably in close contact with the outer peripheral surface of the rotary shaft 300 inserted through the inner periphery of the housing 200. As a result, the interior space A is sealed.

In this type of sealing device 100, when the rotary shaft 300 is horizontal (substantially horizontal) and rotates at high speed, the lubricating oil supplied from the interior space A side and attached to the outer peripheral surface of the rotary shaft 300 is subjected to centrifugal force. Therefore, a sufficient lubricating oil film is hardly formed on the sliding portion of the seal lip 103 with respect to the rotating shaft 300. The same applies when the amount of lubricating oil supplied is small. If a sufficient lubricating oil film is not formed, the sliding portion of the seal lip 103 deteriorates due to frictional heat and cracks occur, abnormal wear occurs, and there is a risk of early leakage.

Therefore, the sealing device 100 shown in FIG. 10 covers the inner space A of the seal lip 103 on the inner periphery of the fixed seal portion 102 in order to form a sufficient lubricating oil film on the sliding portion of the seal lip 103. An oil supply member 104 is attached. This oil supply member 104 receives and adheres to the surface a mist-like lubricating oil flying from the interior space A side, and among these, oil droplets O attached to the oil supply member 104 on the upper side of the seal lip 103 It is intended to ensure the lubricity of the sliding portion of the seal lip 103 by dropping from 104a to the portion of the outer peripheral surface of the rotating shaft 300 that is in the vicinity of the sliding portion of the seal lip 103 (Patent Document). 1). However, in the oil supply member 104 according to the prior art, the amount of lubricating oil supplied to the sliding portion of the seal lip 103 is not always sufficient, and further improvement has been desired.

JP 2008-309328 A

The present invention has been made in view of the above points, and its technical problem is to further improve the lubricity of the sliding portion of the seal lip.

As a means for effectively solving the technical problem described above, a sealing device according to the invention of claim 1 is a sealing device for sealing a fluid at the outer periphery of a horizontal rotation shaft, and is inserted into the inner periphery of the housing. A seal lip that is slidably in contact with the outer peripheral surface of the rotating shaft in a state of facing the internal space, and an oil supply member that extends to cover the internal space side of the seal lip. Is located on the upper side of the seal lip, and a required number of windows are opened, and on the inner diameter side, the tip facing the inner space side is close to the outer peripheral surface of the rotating shaft and toward the outer peripheral side of the seal lip. A guide tube portion having a large diameter is formed.

A sealing device according to a second aspect of the present invention is the sealing device according to the first aspect, wherein a guide plate for guiding the drop of the oil droplet to the vicinity of the sliding portion of the seal lip is formed on the window portion.

According to a third aspect of the present invention, there is provided the sealing device according to the first aspect, wherein an oil injection port for injecting oil toward the guide cylinder portion of the oil supply member is provided on the in-machine space side of the oil supply member. The guide tube portion has an inclination to return oil from the oil injection port toward the window portion side of the oil supply member.

According to the sealing device of the first aspect of the present invention, a part of the oil droplets flying from the in-machine space side slides on the seal lip through the window provided on the oil supply member located above the seal lip. Of the oil droplets that fall to the vicinity of the rotating shaft and adhere to the outer peripheral surface of the rotating shaft, those that are located on the inner peripheral side of the guide cylindrical portion of the oil supply member can be shaken off by the centrifugal force and scattered, Since it is trapped in the large diameter side and falls to the vicinity of the sliding part of the seal lip, it is possible to improve the lubricity of the sliding part of the seal lip and maintain good sealing performance over a long period of time. it can.

According to the sealing device of the second aspect of the invention, in addition to the effect of the first aspect, the guide plate formed on the window portion receives the oil droplets flying to the window portion and falls to the vicinity of the sliding portion of the seal lip. Therefore, the lubricity of the sliding portion of the seal lip can be improved more reliably.

According to the sealing device of the invention of claim 3, in addition to the effect of claim 1, the oil injected from the oil injection port is kneaded toward the window part side of the oil supply member by the guide cylinder part of the oil supply member. Therefore, a part of the oil droplet is guided from the window part to the inner surface of the guide tube part and falls to the vicinity of the sliding part of the seal lip. Good sealing performance can be maintained over a wide range.

It is a half sectional view of the wearing state which shows the 1st form of the sealing device concerning the present invention by cutting with the plane which passes along an axis. It is a partial section perspective view which cuts and shows the 1st form of the sealing device concerning the present invention by the plane which passes along an axis. It is explanatory drawing which shows the effect | action by the 1st form of the sealing device which concerns on this invention. It is a half sectional view of the mounting state which cuts and shows the 2nd form of the sealing device concerning the present invention by the plane which passes along an axial center. It is a partial section perspective view which cuts and shows the 2nd form of the sealing device concerning the present invention by the plane which passes along an axis. It is explanatory drawing which shows the effect | action by the 2nd form of the sealing device which concerns on this invention. It is a half sectional view of the mounting state which shows the 3rd form of the sealing device which concerns on this invention by cut | disconnecting in the plane which passes along an axial center. It is explanatory drawing which shows the effect | action by the 3rd form of the sealing device which concerns on this invention. It is a half sectional view of the mounting state which shows the conventional sealing device cut | disconnected and shown by the plane which passes along an axial center. It is a half sectional view of the mounting state which shows the conventional sealing device cut | disconnected and shown by the plane which passes along an axial center.

Hereinafter, preferred embodiments of the sealing device according to the present invention will be described with reference to the drawings. First, FIG.1 and FIG.2 shows the 1st form of the sealing device based on this invention.

In FIG. 1, reference numeral 1 is a housing of an apparatus, and reference numeral 2 is a rotating shaft inserted through the inner periphery of the housing 1 whose axis is oriented sideways (substantially horizontal). That is, the rotating shaft 2 is rotated about a substantially horizontal axis, and the sealing device 10 according to the present invention is mounted on the inner peripheral surface 1 a of the housing 1.

As shown in FIGS. 1 and 2, the sealing device 10 includes a reinforcing ring 11, a fixed seal portion 12 formed integrally with the reinforcing ring 11 by a rubber material or a synthetic resin material having rubber-like elasticity, a seal The lip 13 and the dust lip 14, a garter spring 15 fitted to the outer peripheral surface near the tip of the seal lip 13, and an oil supply member 16 extending so as to cover the in-machine space A side of the seal lip 13 are provided.

Specifically, the reinforcing ring 11 is manufactured by press molding of a metal plate or the like, and includes an outer diameter cylindrical portion 11a in which a fixed seal portion 12 is integrally vulcanized and bonded to an outer peripheral surface, and the outer diameter cylindrical portion. 11a has a substantially L-shaped cross section composed of an inward flange 11b extending from the end opposite to the in-machine space A to the inner diameter side.

The fixed seal portion 12 is a portion that is press-fitted and tightly fitted to the inner peripheral surface 1 a of the housing 1, and is between the outer diameter cylindrical portion 11 a of the reinforcing ring 11 and the inner peripheral surface 1 a of the housing 1 in the mounted state. , And pre-compressed appropriately in the radial direction.

The seal lip 13 extends from the inner diameter portion of the inward flange 11b of the reinforcing ring 11 toward the in-machine space A side, and the inner diameter portion having a substantially V-shaped cross section in the vicinity of the tip thereof is appropriately tightened to the outer peripheral surface of the rotary shaft 2. It comes to be slidably in close contact with each other.

The dust lip 14 extends from the root of the seal lip 13 toward the side opposite to the in-machine space A, and the inner diameter end thereof is close to the outer peripheral surface of the rotating shaft 2 with a minute gap or is slightly tightened. It comes to be slidably in close contact with each other.

The garter spring 15 is formed by connecting both ends of a metal coil spring into an annular shape. The garter spring 15 is fitted in an annular groove formed on the outer peripheral surface of the seal lip 13, and the seal lip 13 with respect to the outer peripheral surface of the rotary shaft 2. To compensate for the tension of

The oil supply member 16 is manufactured by press molding of a metal plate or the like, and includes an attachment cylinder portion 16a press-fitted to the inner peripheral surface of the outer diameter cylinder portion 11a of the reinforcing ring 11, and an in-machine space A thereof. The disk portion 16b extending from the end on the inner side toward the inner diameter side, and the inner diameter of the disk portion 16b located on the outer diameter side of the tip end portion of the seal lip 13 is inclined toward the front side of the seal lip 13 (the in-machine space A side). An intermediate conical portion 16c extending further from the inner diameter toward the in-machine space A, and having a conical cylindrical shape with a gentler slope than the intermediate conical portion 16c and a larger diameter toward the outer peripheral side of the seal lip 13. It consists of a guide tube portion 16d.

In the disk portion 16b and the intermediate cone portion 16c of the oil supply member 16, a plurality of

window portions

161 and 162 are opened at predetermined intervals in the circumferential direction. Further, the guide cylinder portion 16 d of the oil supply member 16 has a tip facing the in-machine space A side close to the outer peripheral surface of the rotary shaft 2.

In the sealing device 10 according to the first embodiment configured as described above, the tip of the guide cylinder portion 16d of the oil supply member 16 faces the in-machine space A side so that the seal lip 13 faces the in-machine space A side. As described above, the fixed seal portion 12 is press-fitted to the inner peripheral surface 1 a of the housing 1, and the inner diameter portion of the seal lip 13 is slidably brought into close contact with the outer peripheral surface of the rotary shaft 2. For example, mist-like lubricating oil present in A is prevented from leaking from the shaft periphery to the atmosphere side outside the machine B, and foreign matter is prevented from entering from outside the machine B.

Here, when the lubricating oil is present in the in-machine space A in a mist shape, it is generally difficult to form a good lubricating oil film on the sliding portion S of the seal lip 13 with respect to the outer peripheral surface of the rotating shaft 2. However, according to the sealing device 10 of this embodiment, on the upper side of the rotating shaft 2, some of the oil droplets flying from the in-machine space A are indicated by reference numerals O ₁ and O ₂ in FIG. Since the oil is taken into the oil supply member 16 through the

windows

161 and 162 and falls to the vicinity of the sliding portion S of the seal lip 13, formation of a good lubricating oil film on the sliding portion S is promoted.

Also, part of the oil droplets adhering on board space A side of the surface of the disk portion 16b, an intermediate conical portion 16c and the guide tube portion 16d in the oil supply member 16 in the upper rotary shaft 2, as indicated by the arrow F ₁ Then, it flows down the outer peripheral surface of the guide tube portion 16d from the tip to the outer peripheral surface of the rotary shaft 2, and further scatters into the in-machine space A by centrifugal force as indicated by reference numeral O _4. as indicated by the arrow F _2, incorporated into the inner circumference of the guide tube portion 16d in the oil supply member 16, by the centrifugal force of the rotating direction of the air flow acting on the oil droplets, it is guided into the large diameter side of the guide tube portion 16d As a result, the seal lip 13 falls to the vicinity of the sliding portion S, and this also promotes the formation of a good lubricating oil film on the sliding portion S.

In addition, the oil supply member 16 has an intermediate conical portion 16c and a guide tube portion 16d that protrude toward the in-machine space A side, so that the oil supply member 16 is a plane perpendicular to the axis, such as the oil supply member 104 of FIG. More lubricating oil can be collected as compared with the one that collects oil droplets.

Therefore, by these actions, the lubricity of the sliding portion S of the seal lip 13 can be improved and good sealing performance can be maintained over a long period of time.

The oil supply member 16 naturally drops oil droplets on the sliding portion S of the seal lip 13 from the upper side of the rotating shaft 2 (upper side of the seal lip 13). However, if it is opened only at a position above the rotary shaft 2 (seal lip 13) at a predetermined interval throughout the circumferential direction, when the sealing device 10 is mounted on the housing 1, It is not necessary to perform the alignment in the circumferential direction so that the

windows

161 and 162 are located above the rotating shaft 2 (seal lip 13).

Next, FIGS. 4 and 5 show a second embodiment of the sealing device according to the present invention.

In the second embodiment, the difference from the first embodiment described above is that the disk portion 16b of the oil supply member 16 has no window portion, and the window portion 163 opened in the intermediate cone portion 16c is It is not completely punched out, but is formed by punching out the tongue-shaped guide plate 164 through the U-shaped notch in the intermediate cone portion 16c.

Specifically, the guide plate 164 forms a plane parallel to the disk portion 16b, in other words, a plane substantially orthogonal to the axis, and is located on the outer peripheral side of the tip of the seal lip 13, and the tip 164a faces the inner diameter side. Yes. The window portion 163 is established by driving the guide plate 164 from the intermediate cone portion 16c so as to form a plane substantially orthogonal to the axis.

Similarly to the first embodiment, the sealing device 10 according to the second embodiment configured as described above is arranged so that the seal lip 13 faces the in-machine space A, in other words, the tip of the guide cylinder portion 16d in the oil supply member 16 is The fixed seal portion 12 is press-fitted to the inner peripheral surface 1a of the housing 1 so as to face the in-machine space A, and the inner diameter portion of the seal lip 13 is slidably in close contact with the outer peripheral surface of the rotary shaft 2. This prevents, for example, mist-like lubricating oil present in the in-machine space A from leaking from the shaft periphery to the atmosphere side outside the machine B, and prevents foreign matter from entering from the outside B.

On the upper side of the rotary shaft 2, a part of the oil droplets flying from the in-machine space A is taken into the oil supply member 16 through the window portion 163 as shown by reference numeral O ₅ in FIG. Since it falls to the vicinity of 13 sliding parts S, formation of the favorable lubricating oil film to the sliding parts S is promoted.

In addition, a part of the oil droplets that collide with and adhere to the surface of the disk portion 16b of the oil supply member 16 on the upper side of the rotary shaft 2 or the space on the machine space A side of the guide plate 164, as indicated by reference numeral O ₆ , Along the guide plate 164, the tip 164a drops to the vicinity of the sliding portion S of the seal lip 13.

Furthermore, oil droplets were deposited at the upper side of the rotary shaft 2 to the outer peripheral surface of the intermediate conical portion 16c and guide tube portion 16d flows down to the outer peripheral surface of the rotating shaft 2 as shown by arrow F _1, indicated by reference numeral O ₄ As shown by the arrow F ₂ , the other part of O ₃ that has flown into the in-machine space A due to centrifugal force and has flowed down to the outer peripheral surface of the rotary shaft 2 is taken into the inner periphery of the guide cylinder portion 16 d. Since the centrifugal force of the airflow in the rotational direction acting on the oil droplets is guided to the large diameter side of the guide cylinder portion 16d and falls to the vicinity of the sliding portion S of the seal lip 13, this also causes the sliding portion. Formation of a good lubricating oil film on S is promoted.

Also in this case, the oil supply member 16 has an intermediate conical portion 16c and a guide tube portion 16d that protrude toward the in-machine space A, so that the oil supply member 16 is orthogonal to the axis as in the oil supply member 104 of FIG. More lubricating oil can be collected as compared with the one that collects oil droplets on a flat surface.

Next, FIG. 7 shows a third embodiment of the sealing device according to the present invention.

In the third embodiment, the sealing device 10 basically has a substantially cylindrical shape integrally formed with the reinforcing ring 11 with a rubber material or a synthetic resin material having rubber-like elasticity, as in the first or second embodiment. The fixed seal portion 12, the seal lip 13 and the dust lip 14, the garter spring 15 fitted to the outer peripheral surface near the tip of the seal lip 13, and the oil supply member 16 extending so as to cover the in-machine space A side of the seal lip 13. With.

In the third embodiment, the difference from the first or second embodiment described above is that the oil supply member 16 is press-fit into the inner peripheral surface of the outer diameter tube portion 11a of the reinforcing ring 11. 16a, a disk portion 16e extending from the end in the press-fitting direction to the inner diameter side, and a guide having a conical cylinder shape having a small diameter from the inner diameter end toward the front side (inside the machine space A) of the seal lip 13 An oil having a cylindrical portion 16f, the inner diameter end of which is close to the front end surface 13a of the seal lip 13 in the axial direction, and injects oil toward the guide cylindrical portion 16f on the rising surface 1b of the seal mounting portion in the housing 1 The injection port 1c is located at the upper side of the rotary shaft 2 and is opened.

In the disk portion 16e of the oil supply member 16, a plurality of window portions 165 are opened at predetermined intervals in the circumferential direction. The inclination angle of the guide tube portion 16f is set so that the oil injected from the oil injection port 1c is turned back toward the window portion 165.

In the sealing device 10 according to the third embodiment configured as described above, the fixed seal portion 12 is press-fitted to the inner peripheral surface of the seal mounting portion of the housing 1 so that the seal lip 13 faces the interior space A side. In addition, since the inner diameter portion of the seal lip 13 is slidably brought into close contact with the outer peripheral surface of the rotary shaft 2, for example, mist-like sealing target oil existing in the in-machine space A is discharged from the shaft periphery to the atmosphere B outside the machine. The dust strip 14 prevents leakage of foreign matter from outside the machine B.

Lubricating oil for lubricating the sliding portion S of the seal lip 13 with respect to the outer peripheral surface of the rotating shaft 2 as shown in FIG. 8 from the oil injection port 1c opened on the rising surface 1b of the seal mounting portion in the housing 1. O is injected substantially horizontally. And the lubricating oil O, by striking the guide tube portion 16f of the oil supply member 16 located in front of the oil injection port 1c, partially O ₁₁ is directed to the outer diameter side of the guide cylinder portion 16f (upper side) Te returned I behead obliquely, adhere to the inner surface of the window portion 165 which is opened in the disk portion 16e, is guided along the inner surface of the guide tube portion 16f as shown by reference numeral O ₁₂ therefrom, the oil droplets O since ₁₃ is in fall into the vicinity of the sliding portion S of the seal lip 13 is prompted formation of a good lubricating oil film on the sliding portion S.

Even in this embodiment, the oil drop O ₁₃ is dropped from the oil supply member 16 onto the sliding portion S of the seal lip 13 from the upper side of the rotary shaft 2, so that the window portion 165 basically has the rotary shaft 2 ( It is only necessary to be opened at a position above the seal lip 13). However, if the seal lip 10 is opened at predetermined intervals in the entire circumferential direction, the window portion 165 can be rotated when the sealing device 10 is attached to the housing 1. It is not necessary to perform circumferential alignment so as to be above 2 (seal lip 13).

Further, the opening position of the window portion 165 does not necessarily need to be the disk portion 16e, and the position where the O ₁₁ turned back by the guide tube portion 16f can be captured and is above the rotating shaft 2 (seal lip 13). If it is, it will not specifically limit.

DESCRIPTION OF SYMBOLS 1 Housing 1c Oil injection port 2 Rotating shaft 10 Sealing device 11 Reinforcement ring 12 Fixed seal part 13 Seal lip 16 Oil supply member 16a Mounting cylinder part 16b Disk part 16c Intermediate |

middle cone part

16d, 16f Guide cylinder part 161,162,163,165 Window 164 Guide plate A Machine interior B Machine exterior S Sliding part

Claims

A sealing device that seals fluid at the outer periphery of a laterally rotating shaft, the seal lip being slidably in contact with the outer peripheral surface of the rotating shaft inserted through the inner periphery of the housing in a state of facing the in-machine space side; An oil supply member extending so as to cover the in-machine space side of the seal lip, and the oil supply member is provided with a required number of windows located on the upper side of the seal lip. A sealing device, characterized in that a guide cylinder portion having a facing tip close to the outer peripheral surface of the rotating shaft and having a larger diameter toward the outer peripheral side of the seal lip is formed.
2. The sealing device according to claim 1, wherein a guide plate that guides the drop of the oil droplet to the vicinity of the sliding portion of the seal lip is formed in the window portion.
An oil injection port for injecting oil toward the guide cylinder portion of the oil supply member is provided on the in-machine space side of the oil supply member, and the guide cylinder portion supplies the oil from the oil injection port to the window portion of the oil supply member. The sealing device according to claim 1, wherein the sealing device has an inclination that turns back toward the side.