JPH04126064U - Sealing device assembly - Google Patents

Abstract

(57) [Summary] [Purpose] Appropriately leaks the lubricant in the internal space of the device to the outside world, prevents dust, dirt, etc. from the outside world from entering the internal space, and furthermore prevents muddy water from the outside world from entering the internal space. prevent. [Structure] First and second radial seal portions, an end seal portion, and a first radial portion extending inwardly from the outer member and a second radial portion extending outward from the inner member. Four seal parts of the third radial seal part were formed. [Effect] While appropriately suppressing the lubricant inside the device from leaking to the outside, it also prevents dust and dirt from the outside world from entering the inside, and furthermore prevents muddy water from the outside world from entering the internal space. , can prevent the occurrence of rust due to the intrusion of muddy water.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention enables two members that rotate relative to each other, such as the inner and outer rings of a rolling bearing, to A sealing device placed between two members, one of which is rotatable and the other fixed. The present invention relates to an assembly, and in particular to an assembly with four seals.

0002

[Prior art and its problems]

Housing for rotating shafts with rotating parts attached to various devices, machines, etc. In some cases, the equipment is rotatably supported by a bearing held in the Leakage of lubricant from the internal space to the outside world, or entry of dust, dirt, etc. from the outside world into the inside of the device. A sealing device is assembled adjacent to or within the bearing to prevent A body is provided.

0003 The applicant previously filed a patent application for a sealing device assembly in Japanese Patent Application No. 58-21842. The application was announced on November 9, 1990 (see Japanese Patent Publication No. 2-52140). (see). A feature of the present invention is that the first part extends inward from the outer member (for example, the outer ring of a bearing). a radial member and a second radial member extending outwardly from an inner member (e.g., the inner ring of a bearing); A first radial seal portion, an end seal portion, and a second radial seal portion are provided between the facing member and the second radial seal portion. Three seal parts are formed. The above three seals are inside They are formed in this order on the path from space to the outside world, and the lips of each seal part are It is curved in the forward direction (same direction) as the above route. According to this invention, it is possible to allow leakage of lubricant in the internal space and prevent intrusion of dust etc. from the outside world. It has been found that although the stoppage can be achieved almost satisfactorily, there is still room for improvement. i.e. , the seal part made of an elastic material such as rubber only contacts the mating member elastically. Therefore, it is difficult to say that it is possible to completely prevent water from passing through, and muddy water from the outside world can pass through the three seals. It is also conceivable that the liquid may pass through the interior space and enter the internal space. Water that enters the internal equipment There is a risk of rust. Also, the amount of lubricant (grease) leaking is not appropriate. There are possible cases. This invention was made against the background of the above circumstances, and is a lubricant for the internal space of the device. leaks properly to the outside world, prevents dust and dirt from the outside world from entering the internal space, and further prevents the outside world from entering the internal space. To provide a sealing device assembly that can reliably prevent muddy water, etc. from entering an internal space. It was made for the purpose of

0004

[Means and actions for solving the problem]

In order to achieve the above object, the present invention provides a concentrically and radially spaced formed between a radially inner member 14 and an outer member 16 that are rotatable relative to each other. A sealing device assembly 20 for sealing the annular space a first radial portion 34 extending from the outer member toward the inner member; A first support member 30 that extending radially outwardly from the inner member toward the outer member; a second radial portion 5 located axially outside and opposite the first radial portion; 4, a second support member 50 having a a lip extending radially inwardly from the first radial portion to the inner member; a first radial seal portion 72 having a portion 42; located on the axially outer side of the first radial seal portion, and located in the first radial direction portion; a second radial having a lip portion 44 extending radially inwardly from the inner member to the inner member; Lucille part 74, axially inwardly from said second radial portion to an end face of said first radial portion; an end seal portion 76 having an extending lip portion 62; a lip extending radially outwardly from the second radial portion to the outer member; a third radial seal portion 78 having a portion 66; Consisting of the first and second radial seal parts, the end face seal part and the third radial seal part; On the path from the interior space 90 to the outside world 92, the and at least the second radial seal portion, the end seal portion, and the second radial seal portion, and at least the second radial seal portion, the end face seal portion, and the The lip portions 44, 62, 64 of the radial seal portion No. 3 are curved in the same direction as the above path. It is characterized by

[0005]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a rotating shaft 10 to which a rotating member (not shown) is fixed is attached to a housing. Rotatable by a bearing 15 consisting of an inner ring 14 and an outer ring 16 held by a ring 12 I support it. That is, the rotating shaft 10 is inserted into the hollow part of the inner ring 14 and the outer ring 1 6 is fitted and held on the inner peripheral surface of the housing 12. Outer edge of inner ring 14 and outer ring 1 A sealing device assembly 20 of the present invention is disposed between the opposing portion of 6. . The details are as shown in FIG.

[0006] The sealing device assembly 20 includes a first support member 30 held on the outer ring 16 and a distal end thereof. a first seal member 40 fixed to the inner ring 14 and a second support member 5 held to the inner ring 14. 0 and a second seal member 60 fixed to its tip. The first support member 30 includes a first cylindrical portion 32 that is fitted and held on the inner peripheral surface of the outer ring 16. and a first radial portion 34 extending radially inwardly from one end thereof. It has an L-shaped cross section. The first radial portion 34 is fixed to the tip (inner end) thereof. The first seal member 40 has a first lip portion 42 and a second lip portion 4 on its inner peripheral surface. 4, and both lip portions are spaced apart in the axial direction. On the other hand, the second support member 50 is a second cylindrical portion that is fitted and held on the inner peripheral surface of the inner ring 14. 52 and a second radial portion 54 extending radially inwardly from one end thereof. The second seal member 60 has an L-shaped cross section and is fixed to its tip (outer end). , a third lip portion 62 and a fourth lip portion 64. Of these, the third The tap portion 62 extends axially inward (leftward in FIG. 2) and extends in the first radial direction. An end seal portion 76 is formed in close contact with the portion 32. The fourth lip portion 64 is a third radial seal extending radially outwardly and in close contact with the first cylindrical portion 32; A portion 78 is formed. The first lip portion 42 of the first sealing member 40 is located on the inner periphery of the second cylindrical portion 52. The first radial seal part (labyrinth seal) with a small gap between the 72 is formed. Further, the second lip portion 44 is in contact with the second cylindrical portion 52. A second radial seal portion 74 is formed. The first lip portion 42 and the second lip portion An annular recess 45 is formed between the recess 44 and the recess 44, and is filled with grease 47. ing.

[0007] The sealing device assembly 20 of the present invention includes a first support to which a first sealing member 40 is fixed. The member 30 and the second support member 50 to which the second seal member 60 is fixed are integrated. In this state, it is assembled into the space between the outer ring 16 and the inner ring 14. In this way There are four first to fourth seals 72 and 74 on the path from the internal space 90 to the outside world 92. , 76 and 78 are formed, of which the first radial seal portion 72 is a labyrinth. The lip portion 42 is configured as a seal, and the lip portion 42 faces opposite to the path from the internal space to the outside world. The second radial seal part 74, the end face seal part 76 and the third radial seal part 74 are The lip portions 44 , 62 , and 64 are connected from the inner space 90 to the outside world 92 . It is curved in the same direction as the direction toward.

[0008] In this way, as is clear from the aforementioned Japanese Patent Publication No. 2-52140, the second Radial seal portion 74, end face seal portion 76, and third radial seal portion 78 components Due to the physical configuration, particularly the orientation of the lips 44, 62 and 64, the inside of the device 90 is This prevents lubricant from leaking to the outside 92 and dust from the outside from entering the inside. Prevented. In addition, the three seals are located inside the second radial seal portion 74. A first radial seal part 72 is formed in the opposite direction to the seal part, and a second radial seal part 72 is formed in the direction opposite to the seal part. Grease 47 was filled in the recess 45 formed between the radial seal portion 74 and the radial seal portion 74 . As a result, even if muddy water or the like from outside the device falls on the sealing device assembly 20, the third radial seal portion 78, end face seal portion 76 and second radial seal portion 74. Even if the grease 47 filled in the recess 45 and the first The radial seal portion 72 prevents this muddy water from entering the internal space. Ru. Furthermore, the grease 47 in the first radial seal portion 72 and the recess 45 is Compared to Akira's product, it also has the effect of suppressing the lubricant inside the device from leaking to the outside. I have it. Further, the first radial seal portion 72 is a labyrinth seal. Therefore, friction torque does not increase. Moreover, the first radial seal portion 72 is formed, and the grease 47 is filled in the recess 45. In addition to the effect that the sealing device assembly has, the small amount of filling , supplementary effects have been added.

[0009] Next, another embodiment of the present invention will be described based on FIGS. 3 and 4. The second embodiment shown in FIG. 3 differs from the first embodiment described above in that the first radial seal This is the specific structure of the department. That is, in this embodiment, the first radial seal portion 82 is radially inward, like the first radial seal portion 72 above. does not form an angle with the radial direction. Further, the axial thickness of the seal portion 82 is radial. It is made thicker than the seal portion 74. The rest of the configuration is the same as the first embodiment above. be. If the direction and thickness of the first radial seal portion 82 are set as described above, the second radial seal portion 82 The radial seal 82 is not affected by the second radial seal portion 74, and the labyrinth This will further improve the effect of the The third embodiment shown in FIG. 4 differs from the first embodiment described above in that the first radial seam The ring portion 86 is in contact with the inner peripheral surface of the second cylindrical portion 52 (different from the labyrinth seal). (not). Therefore, this embodiment has a higher friction torque than the first embodiment. is slightly larger, but the sealing performance is improved accordingly. Other configurations are listed in 1 above. This is similar to the example. It should be noted that the present invention can be modified and improved as appropriate in addition to the above embodiments. Not at all

0010

[Effect of the idea]

As described above, according to the present invention, the lubricant inside the device does not leak to the outside. It is possible to prevent dust, dirt, etc. from the outside world from entering the interior while keeping it at an appropriate level. In addition, it is possible to effectively prevent muddy water from the outside from entering the internal space. Therefore This effectively prevents rust from forming on internal devices due to muddy water, and protects bearings and internal components. The effect is that the operation of the device can be maintained satisfactorily over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the entire device to which the present invention is applied;

FIG. 2 is a sectional view showing the first embodiment of the present invention;

FIG. 3 is a sectional view showing a second embodiment of the present invention;

FIG. 4 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols of main parts]

14...Inner member 16...Outer member 20...Sealing device assembly 30...First support member 40...First seal member 50...Second support member 60...Second seal member 72, 74, 76, 78... Seal part 45・・・Concavity 47...Grease

Claims (1)

[Scope of utility model registration request] 1. A sealing device assembly for sealing an annular space formed between a radially inner member and an outer member that are concentrically and radially spaced and rotatable relative to each other, comprising: a first support member having a first radial portion extending from the outer member toward the inner member; and a first support member extending radially outwardly from the inner member toward the outer member; a second support member having an opposing second radial portion located axially outwardly of the portion; and a lip portion extending radially inwardly from the first radial portion to the inner member. a first radial seal portion having a lip portion located axially outwardly of the first radial seal portion and having a lip portion extending radially inwardly from the first radial portion to the inner member; a radial seal portion; an end seal portion having a lip portion extending axially inwardly from the second radial portion to an end face of the first radial portion; and from the second radial portion to the outer member. and a third radial seal portion having a lip portion extending radially outward;
The second radial seal part, the end face seal part, and the third radial seal part are formed in this order from the inner space side on a path from the inner space to the outside world, and at least the second radial seal part, End face seal part and third
A sealing device assembly characterized in that a lip portion of the radial seal portion is curved in the same direction as the path.