Lip sealing device

Abstract

To provide a lip sealing device that can be easily assembled and disassembled. [Solution] The seal member 2 is an annular seal member having a base portion 21 positioned on the fixed-side element 3 side and a lip portion 22 positioned on the rotating-side element 5 side, and a sleeve 4 that sandwiches the seal member 2 together with the fixed-side element 3, wherein the seal member 2 and the sleeve 4 are arranged to be relatively movable, and the base portion 21 has a radial portion 212 that extends radially from the lip portion 22 and is sandwiched axially by the fixed-side element 3 and the sleeve 4, and an axial portion 212 that extends axially from the side of the radial portion 212 opposite to the lip portion 22 and is sandwiched radially by the fixed-side element 3 and the sleeve 4.

Description

Technical Field

[0006] , ,

[0001] The present invention relates to a lip seal device, for example, a lip seal that seals between a fixed-side element and a rotating-side element.

Background Art

[0002] As a shaft sealing device for preventing leakage of fluid, a lip seal device is used to obtain the desired sealing performance by utilizing the fluid pressure. For example, by fixing the base of a seal member formed of elastic rubber to a housing and bringing the lip portion extending from the base into sliding contact with the rotating shaft, leakage of the refrigerant inside the machine to the atmosphere side is prevented.

[0003] In the lip seal device of Patent Document 1, a seal member in which a rubber-like elastic body is vulcanized and adhered to a metal ring is press-fitted and fixed to the inner peripheral surface of a housing, and the lip portion of the seal member is configured to be pressed against the outer peripheral surface of the shaft by receiving the sealing fluid pressure. Thereby, the space between the housing and the shaft is sealed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the lip seal device of Patent Document 1, since the seal member is formed by vulcanizing and adhering a rubber-like elastic body to a metal ring, a complicated vulcanization adhesion process is required during manufacturing, and a complicated disassembling process for separation is required during disposal.

[0006] The present invention has been made paying attention to such problems, and an object thereof is to provide a lip seal device that can be easily assembled and disassembled.

Means for Solving the Problems

[0007] To solve the above problems, the lip sealing device of the present invention is A lip seal device that seals the space between a stationary element and a rotating element that rotate relative to each other, An annular sealing member having a base portion disposed on the fixed-side element and a lip portion disposed on the rotating-side element, The set includes a sleeve that sandwiches the sealing member together with the fixed side element, The sealing member and the sleeve are arranged to be movable relative to each other. The base portion comprises a radial portion extending radially from the lip portion and sandwiched axially between the fixed side element and the sleeve, and an axial portion extending radially from the side of the radial portion opposite to the lip portion and sandwiched radially between the fixed side element and the sleeve. According to this method, a sleeve separate from the sealing member is used to axially sandwich the radial portion of the base of the sealing member between the fixed element and the sleeve, and the axial portion of the base of the sealing member between the fixed element and the sleeve, thereby attaching the sealing member to the fixed element. This allows for easy assembly and disassembly of the sealing member and the sleeve.

[0008] On the radially opposite side of the lip portion, a space is formed that extends at least in the radial direction. According to this, when the radial portion of the base is pressed against the fixed element by the sleeve, the radial portion elastically deforms toward the space radially opposite to the lip portion, thus not affecting the orientation of the lip portion and maintaining a sealed state.

[0009] The aforementioned space may be a continuous annular space. According to this method, a large margin of deformation can be secured in the radial direction, and deformation can be performed without bias in the circumferential direction.

[0010] The radial portion may be provided with an axial thrust allowance on the lip portion side. According to this, the radial part can be stably pressed by the sleeve with the pressing force.

[0011] The space may be provided in the radial part. According to this, the radial part can be surely deformed into the space.

[0012] The fixed-side element may have a support piece that supports the end portion on the lip part side in the radial part. According to this, it is easy to guide the radial part to deform into the clearance space.

[0013] The sleeve may be provided with a flange on the side opposite to the seal member. According to this, it is easy to push in the sleeve by using the flange.

[0014] The edge on the lip part side of the sleeve may be curved. According to this, it is possible to avoid the edge of the sleeve from damaging the lip part.

Brief Description of Drawings

[0015] [Figure 1] It is a cross-sectional view showing a lip seal device in Embodiment 1 of the present invention. [Figure 2] It is a schematic view showing an assembly procedure of a lip seal device. [Figure 3] It is a schematic view showing a state where a lip seal device is assembled. [Figure 4] It is a cross-sectional view showing a lip seal device in Embodiment 2 of the present invention. [Figure 5] It is a cross-sectional view showing a lip seal device in Embodiment 3 of the present invention. [Figure 6] It is a rear view showing a seal member in Embodiment 4 of the present invention. [Figure 7] [ It is a cross-sectional view showing a lip seal device in Embodiment 5 of the present invention. [Figure 8]It is a cross-sectional view showing the lip seal device in Example 6 of the present invention.

Mode for Carrying Out the Invention

[0016] A mode for carrying out the lip seal device according to the present invention will be described below based on examples.

Example

[0017] The lip seal device according to Example 1 will be described with reference to FIGS. 1 to 3. Hereinafter, the right side of the paper surface of FIG.  1 will be described as the front side of the lip seal device, and the left side of the paper surface of FIG. 1 will be described as the back side of the lip seal device. In FIG. 3, for convenience of explanation, the elastic deformation of the seal member is shown larger than the actual situation.

[0018] As shown in FIG. 1, the lip seal device 1 of the present embodiment is used, for example, in a water pump. The lip seal device 1 is fixed to the housing 3 side, and the lip portion 22 is in sliding contact with the rotating shaft 5 inserted through the housing 3, thereby preventing the fluid on the outside space S1 side and the fluid on the inside space S2 side from mixing. In the present embodiment, a form in which the outside space S1 side is at a higher pressure than the inside space S2 side is exemplified.

[0019] The lip seal device 1 includes an annular seal member 2, a housing 3 as a fixed-side element, and a sleeve 4 separate from the seal member 2.

[0020] The seal member 2 is made of an elastic member such as rubber and includes a base portion 21 and a lip portion 22.

[0021] The base portion 21 includes an axial portion 211 extending in the axial direction and a radial portion 212 extending in the inner diameter direction from the back-side end of the axial portion 211. The lip portion 22 extends inclined in the inner diameter direction from the inner diameter end of the radial portion 212 toward the front side.

[0022] The base portion 21 has an annular groove 213 with a roughly L-shaped cross-section that extends from the outer diameter side of the back surface of the radial portion 212 to the back surface of the outer circumferential surface of the axial portion 211. The space within this groove 213 constitutes a relief space S3, as will be described later.

[0023] Furthermore, the thin-walled portion 212b (see Figure 3) of the radial portion 212, which will be described later, is provided with an annular recess 212c that opens to the back surface. Note that the recess 212c does not have to be annular, but multiple recesses may be provided in the circumferential direction.

[0024] The housing 3 is cylindrical in shape through which the rotating shaft 5, which serves as the rotating element, can be inserted. A mounting portion 3A that opens to the front is formed at the inner diameter end on the front side. The housing 3 has an inner circumference 3a through which the rotating shaft 5 can be inserted.

[0025] The mounting portion 3A consists of a large-diameter inner circumference portion 31 provided on the front side of the housing 3 with a larger diameter than the inner circumference portion 3a, a rear end portion 32 extending inward from the rear end of the large-diameter inner circumference portion 31, and a support portion 33 as a support piece extending from the inner side of the end portion 32 towards the front side. The inner surface of the support portion 33 is the inner circumference portion 3a of the housing 3.

[0026] The sleeve 4 is formed by bending a metal plate and has a cylindrical portion 41, a pressing portion 42, and a flange portion 43. Note that the sleeve 4 is not limited to metal, but may be made of synthetic resin or the like.

[0027] The cylindrical portion 41 is cylindrical and extends in the axial direction. The pressing portion 42 consists of a first portion 42a that curves inward from the rear end of the cylindrical portion 41 and a second portion 42b that curves inward from the inner end of the first portion 42a and extends in the axial direction. The second portion 42b is shorter than the cylindrical portion 41. The flange portion 43 extends outward from the front end of the cylindrical portion 41.

[0028] Next, an example of the assembly of the lip seal device 1 will be described.

[0029] As shown in Figure 2, first, the sleeve 4 is inserted into the seal member 2 from the front side, i.e., assembled by moving it relative to the seal member 2. At this time, the front side portion of the cylindrical portion 41 of the sleeve 4 is positioned along the inner diameter side of the axial portion 211 of the seal member 2, and the first portion 42a of the pressing portion 42 of the sleeve 4 is positioned on the front side of the radial portion 212 of the seal member 2.

[0030] A gap S10 is formed between the second portion 42b of the pressing portion 42 of the sleeve 4 and the lip portion 22 of the sealing member 2. More specifically, at the connection portion between the lip portion 22 and the radial portion 212, that is, on the outer diameter side of the outer diameter end 22a of the lip portion 22, an inclined portion 23 is formed that slopes in a concave curved shape toward the radial portion 212, and a gap S10 is formed between the second portion 42b of the pressing portion 42 of the sleeve 4 and the inclined portion 23.

[0031] Subsequently, by pressing the flange portion 43 of the sleeve 4 with a jig or fingers, the integrated sealing member 2 and sleeve 4 are inserted toward the mounting portion 3A of the housing 3, and the lip portion 22 is properly brought into contact with the rotating shaft 5.

[0032] As shown in Figure 3, when the sealing member 2 and sleeve 4 are inserted into the mounting portion 3A of the housing 3, the axial portion 211 of the sealing member 2 is compressed radially between the cylindrical portion 41 of the sleeve 4 and the large-diameter inner circumference portion 31 of the housing 3, and the radial portion 212 of the sealing member 2 is compressed axially between the pressing portion 42 of the sleeve 4 and the end portion 32 of the housing 3. Furthermore, the inner diameter end of the radial portion 212 of the sealing member 2 is supported by the support portion 33 of the housing 3. The axial portion 211 and the radial portion 212 are compressed between the sleeve 4 and the housing 3 without any gaps, while moving relative to the sleeve 4 in the axial and radial directions.

[0033] In this way, the sealing member 2 can be attached to the housing 3 by clamping it radially and axially between the housing 3 and the sleeve 4. Since the sealing member 2 is attached to the housing 3 by press-fitting the sleeve 4, which is separate from the sealing member 2, into the housing 3 together with the sealing member 2, assembly and disassembly of the sealing member 2 and the sleeve 4 can be easily performed. Furthermore, the compression state of the axial portion 211 and the radial portion 212 does not change over time. In other words, since there is no change in relative position such as gaps forming between the sleeve 4 and the axial portion 211 and the radial portion 212 over time, the sealing performance can be maintained.

[0034] Furthermore, the fluid pressure in the external space S1, which is higher than that in the internal space S2, presses the lip portion 22 against the rotating shaft 5, and the sleeve 4 presses the radial portion 212 of the sealing member 2 against the end portion 32 of the housing 3, thereby improving the sealing performance.

[0035] At this time, the radial portion 212 of the sealing member 2 elastically deforms toward the approximately L-shaped space on the outer diameter side formed by the groove 213, that is, the relief space S3 on the radially opposite side from the lip portion 22. Specifically, the relief space S3 is composed of a radial space portion S31 located on the back side of the thin-walled portion 212b and an axial space portion S32 located on the outer diameter side of the thin-walled portion 212b. In other words, the relief space S3 is formed in an approximately L-shape across the back side and the outer diameter side of the thin-walled portion 212b.

[0036] The sealing member 2 deforms due to the axial pressing force from the pressing portion 42 of the sleeve 4, such that the thin-walled portion 212b tilts toward the back side, i.e., toward the radial space portion S31. Furthermore, due to the stress generated by the axial pressing of the thick-walled portion 212a, the thin-walled portion 212b elastically deforms so that it bulges out toward both the radial space portion S31 and the axial space portion S32.

[0037] In other words, since the radial portion 212 hardly undergoes elastic deformation toward the lip portion 22, it does not affect the orientation of the lip portion 22 and can maintain proper contact with the rotating shaft 5. As a result, the sealed state between the external space S1 and the internal space S2 is maintained.

[0038] Furthermore, since the relief space S3 is formed in an annular shape over the circumferential direction of the base 21, a large amount of elastic deformation space can be secured for the base 21. In addition, the base 21 can be elastically deformed without bias over the circumferential direction. Moreover, since the thin-walled portion 212b preferentially elastically deforms toward the back side to fill the recess 212c, it does not affect the posture of the lip portion 22.

[0039] Furthermore, the radial portion 212 has a thick-walled portion 212a on the inner diameter side and a thin-walled portion 212b on the outer diameter side that is thinner due to the groove 213, and a step is formed between the thick-walled portion 212a and the thin-walled portion 212b. The step between the thick-walled portion 212a and the thin-walled portion 212b in the radial portion 212 is arranged to overlap in the axial direction in the pressing portion 42 of the sleeve 4.

[0040] According to this, the thickened portion 212a functions as a pressing surface that is pressed by the pressing portion 42 of the sleeve 4, so that the radial portion 212 can be stably pressed toward the end portion 32 of the housing 3 by the pressing portion 42 of the sleeve 4.

[0041] Furthermore, since a portion of the pressing force from the pressing portion 42 of the sleeve 4 can be released on the thickened portion 212a side, it is possible to further minimize the impact on the posture of the lip portion 22.

[0042] Furthermore, since the base portion 21 is provided with a groove 213, the base portion 21 can be reliably elastically deformed into the relief space S3, compared to, for example, the case where a relief space is provided on the housing 3 side (for example, the configuration in Figure 7).

[0043] Furthermore, since the sleeve 4 has a flange portion 43 formed on its front side, it is easy to push the sleeve 4 to the back side using a jig or your fingers by utilizing the flange portion 43.

[0044] Furthermore, when the sealing member 2 and sleeve 4 are assembled to the mounting portion 3A of the housing 3, the flange portion 43 is positioned at a distance from the front end face 3b of the housing 3. This ensures that the sealing member 2 can be reliably pushed all the way to the end portion 32 of the housing 3, and the gap S11 between the front end face 3b of the housing 3 and the flange portion 43 can be used to finely adjust the assembly angle of the sealing member 2.

[0045] Furthermore, the housing 3 has a support portion 33 on the inner diameter side of the end portion 32, and the inner diameter side of the radial portion 212 of the sealing member 2 is supported. The lip portion 22 of the sealing member 2 extends inclined in the radial direction toward the front from between the support portion 33 of the housing 3 and the pressing portion 42 of the sleeve 4. In this way, since the support portion 33 supports the inner diameter side of the radial portion 212, the elastic deformation of the radial portion 212 toward the inner diameter side is restricted, and the orientation of the lip portion 22 is less affected.

[0046] Furthermore, the base portion 21 has an axial portion 211 on its outer diameter side, and the axial portion 211 is radially compressed between the cylindrical portion 41 of the sleeve 4 and the large-diameter inner circumference portion 31 of the housing 3, functioning as a secondary seal portion, thereby improving the sealing performance between the seal member 2 and the housing 3.

[0047] Specifically, the axial portion 211 is provided with a bulge 211a that bulges outwards in an annular shape towards the outer diameter at its axial center, and the bulge 211a is pressed against the large-diameter inner circumference 31 of the housing 3, thereby sealing the space between the axial portion 211 and the large-diameter inner circumference 31 of the housing 3. The back side of the bulge 211a forms part of the groove 213, and the front side of the bulge 211a can also be used as a clearance space.

[0048] Furthermore, since the axial portion 211 is axially separated from the flange portion 43, the axial portion 211 is prone to elastic deformation toward the front.

[0049] Furthermore, since the inner diameter edge of the pressing portion 42 of the sleeve 4, that is, the corner between the first portion 42a and the second portion 42b, is smoothly curved, when the sealing member 2 and the sleeve 4 are inserted into the mounting portion 3A of the housing 3, it is possible to avoid the corner between the first portion 42a and the second portion 42b damaging the base portion of the lip portion 22.

[0050] Furthermore, the gap S10 between the pressing portion 42 of the sleeve 4 and the lip portion 22 of the sealing member 2 allows the radial portion 212, which tends to elastically deform slightly inward, to be spared, thus minimizing the impact on the orientation of the lip portion 22.

[0051] Furthermore, because the gap S10 increases the allowable displacement of the lip portion 22, even if there is a relative radial movement between the lip portion 22 and the rotating shaft 5, for example, if the rotating shaft 5 is displaced radially away from the lip portion 22 or radially approaching the lip portion 22, the lip portion 22 can easily follow the displacement of the rotating shaft 5.

[0052] In this embodiment, as an example of assembly, the sealing member 2 and sleeve 4 are pre-integrated before being assembled to the mounting portion 3A of the housing 3. However, the sealing member 2 may be assembled to the mounting portion 3A of the housing 3 and then pressed by the sleeve 4. Furthermore, the assembly procedure may involve assembling the sealing member 2 and sleeve 4 to the mounting portion 3A of the housing 3 and then inserting the rotating shaft 5 into the housing 3.

[0053] Furthermore, in this embodiment, a bulge 211a was provided in the axial portion 211, but the axial portion may have a constant thickness in the axial direction.

[0054] Furthermore, although this embodiment illustrates a configuration in which a support portion 33 is provided on the housing 3, a support piece may not be provided. [Examples]

[0055] Next, the lip sealing device according to Example 2 will be described with reference to Figure 4. Note that the description of components that are identical to those in Example 1 and therefore redundant will be omitted.

[0056] As shown in Figure 4, the lip seal device 200 of this embodiment 2 is equipped with a support member 250 as a receiving member. The configuration of the seal member 220 and the sleeve 240 is the same as that of embodiment 1.

[0057] In this embodiment 2, the inner circumference of the housing 230 is configured in a stepped shape, with a large-diameter inner circumference portion 231 and a small-diameter inner circumference portion 233 connected by an end portion 232.

[0058] The support member 250 is a rigid, annular member made of metal or the like, and has a roughly inverted J-shape in cross-section, consisting of a radial portion 251 extending radially and an axial portion 252 extending axially from the inner diameter end of the radial portion 251. In this embodiment 2, the axial portion 252 is slightly inclined toward the inner diameter and extends toward the front.

[0059] The support member 250 is assembled to the inner circumference of the housing 230 with its radial portion 251 in contact with the end portion 232 of the housing 230. This constitutes the mounting portion 230A of the housing 230. In other words, the support member 250 constitutes part of the fixed-side element. Specifically, the radial portion 251 of the support member 250 functions as a receiving member against which the radial portion 2212 of the seal member 220 is pressed, and the axial portion 252 of the support member 250 functions as a support piece that supports the inner diameter end of the radial portion 2212 of the seal member 220.

[0060] Thus, the receiving member may be constructed separately from the housing 230. [Examples]

[0061] Next, the lip sealing device according to Example 3 will be described with reference to Figure 5. Note that the description of components that are identical to those in Example 2 and therefore redundant will be omitted.

[0062] As shown in Figure 5, the lip seal device 300 of this embodiment 3 is equipped with an auxiliary seal member 360. The auxiliary seal member 360 is an annular member made of an elastic material and has a roughly inverted J-shape in cross-section, consisting of a radial portion 361 extending in the radial direction and an axial portion 362 that curves and extends axially from the inner diameter end of the radial portion 361.

[0063] The auxiliary sealing member 360 is positioned such that its radial portion 361 is sandwiched axially between the radial portion 351 of the support member 350 and the end portion 332 of the housing 330. The axial portion 362 of the auxiliary sealing member 360 is positioned on the inner diameter side of the axial portion 352 of the support member 350 and is in contact with the rotation axis 35. As a result, the sealing performance between the external space S1 and the internal space S2 is improved by the sealing member 320 and the auxiliary sealing member 360.

[0064] Furthermore, the axial portion 362 of the auxiliary sealing member 360 may be sandwiched radially between the rotating shaft 35 and the axial portion 352 of the support member 350, or there may be a gap between the axial portion 362 and the axial portion 352 of the support member 350. [Examples]

[0065] Next, the lip sealing device according to Example 4 will be described with reference to Figure 6. Note that the description of components that are identical to those in Example 1 and therefore redundant will be omitted.

[0066] As shown in Figure 6, a plurality of recesses 423 are provided on the back surface of the thin-walled portion 4212b of the sealing member 420 used in the lip sealing device of this embodiment 4.

[0067] The recess 423 opens to the rear side. The recess 423 is equally spaced concentrically with the sealing member 420 on the rear side of the thin-walled portion 4212b. The space within this recess 423 functions as a clearance space. Thus, the clearance space is not limited to being continuous in an annular shape, but may be spaced apart in the circumferential direction and arranged in an annular shape, as in this embodiment 4.

[0068] Furthermore, the recess 423 may be open to the outer diameter side. Also, the number and shape of the recesses can be freely changed.

[0069] Next, the lip sealing device according to Example 5 will be described with reference to Figure 7. Note that the description of components that are identical to those in Example 1 and therefore redundant will be omitted.

[0070] As shown in Figure 7, the lip seal device 500 of this embodiment 5 is provided with an annular recess 534 on the outer diameter side of the end 532 of the housing 530 that is recessed on the back side. Also, the seal member 520 of this embodiment 5 is not provided with a groove.

[0071] When the sealing member 520 is assembled to the mounting portion 530A of the housing 530 and pressed to the rear side with the sleeve 540, the radial portion 5212 of the sealing member 520 elastically deforms toward the annular recess 534, so as not to affect the orientation of the lip portion 522. In other words, in this embodiment 5, the annular recess 534 provided in the housing 530 functions as a clearance space.

[0072] Furthermore, it is preferable that the step between the end portion 532 of the housing 530 and the annular recess 534 overlaps axially with the pressing portion 542 of the sleeve 540. In addition, the clearance space may be formed to be recessed on the outer diameter side of the large diameter inner circumference of the housing.

[0073] Next, the lip sealing device according to Example 6 will be described with reference to Figure 8. Note that the description of components that are identical to those in Example 1 and therefore redundant will be omitted.

[0074] As shown in Figure 8, in this embodiment 6, the lip seal device 600 has a second portion 642b of the sleeve 64 that extends axially toward the front side of the outer diameter end 622a of the lip portion 622. This prevents the end of the second portion 642b of the sleeve 640 from contacting the lip portion 622 when the rotating shaft 65 and the housing 630 move relative to each other in the radial direction, thereby preventing damage to the lip portion 622.

[0075] Furthermore, the lip seal device 600 of this embodiment 6 does not have a support portion in the housing 630. The inner diameter end portion 612d of the radial portion 612 of the seal member 620 extends axially approximately parallel to the rotation axis 65. As a result, the inner diameter end portion 612d of the radial portion 612 and the inclined portion 623 are configured to expand radially from the lip portion 622 toward the radial portion 612. In other words, the radial cross-sectional area at the base of the lip portion 622 is made large, making it difficult for the posture of the lip portion 622 to change.

[0076] Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included.

[0077] For example, in the above embodiments 1 to 5, the housing was described as the fixed element and the shaft as the rotating element, but the housing may be the rotating element and the shaft as the fixed element. In this case, it is sufficient that the sealing member is attached to the fixed shaft side. In this case, a receiving member for holding the sealing member should be provided on the fixed shaft. Also, it is sufficient that the lip portion slides against the housing of the rotating element which is located on the outer diameter side.

[0078] Furthermore, the fluids in the external space and the internal space can be freely changed. [Explanation of symbols]

[0079] 1 Lip sealing device 2 sealing member 3. Housing (fixed side element) 4 sleeves 5. Rotation axis (rotational element) 21 Base 22 Lip section 33 Support part (support piece) 43 Flange section 200 Lip sealing device 211 Axial portion (secondary seal portion) 212 Radial portion 212a Thick wall part 212b Thin wall part 212c recess 213 Recessed groove S1 Exterior Space S2 In-flight space S3 Escape Space (Space)

Claims

1. A lip seal device that seals the space between a stationary element and a rotating element that rotate relative to each other, An annular sealing member having a base portion disposed on the fixed-side element and a lip portion disposed on the rotating-side element, The set includes a sleeve that sandwiches the sealing member together with the fixed side element, The sealing member and the sleeve are arranged to be movable relative to each other. The lip seal device comprises a base portion that extends radially from the lip portion and is sandwiched axially between the fixed side element and the sleeve, and an axial portion that extends axially from the side of the radial portion opposite to the lip portion and is sandwiched radially between the fixed side element and the sleeve.

2. The lip seal device according to claim 1, wherein a space extending at least in the radial direction of the seal member is formed on the radially opposite side of the lip portion.

3. The lip seal device according to claim 2, wherein the space is a continuous annular space.

4. The lip seal device according to claim 2, wherein the radial portion is provided with an axial thrust allowance on the lip portion side.

5. The lip seal device according to claim 2, wherein the space is provided in the radial portion.

6. The lip seal device according to claim 1, wherein the fixed side element has a support piece that supports the end portion on the lip side in the radial portion.

7. The lip seal device according to claim 1, wherein the sleeve is provided with a flange on the side opposite to the sealing member.

8. The lip sealing device according to claim 1, wherein the edge of the sleeve on the lip side is curved.

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