JP2014163459A - Dust seal with reinforcement ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust seal having a structure capable of preventing corotation of a seal body 1 and a reinforcement ring 2 without adhering the seal body 1 to the reinforcement ring 2.SOLUTION: A dust seal includes a seal body 1 having a base 11 formed of rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), and a seal lip 12 extending from the base 11 and having a tip end brought into slidably tight contact with an outer peripheral surface of a shaft inserted into a shaft hole 31 of a housing 3; and a reinforcement ring 2 pressure-contacting with the base 11 and bringing the base 11 into pressure-contact with a seal attachment part 32 formed in the shaft hole 31.

Description

  The present invention relates to a dust seal in which a dust or foreign matter is prevented from entering from the outside by a seal lip, and particularly relates to a dust seal having a reinforcing ring.

  Conventionally, as a dust seal that is mounted as a sealing means such as a hinge pin that connects an arm and a bucket in a construction machine such as a hydraulic excavator or a backhoe so as to be capable of relative swinging, as a dust seal that prevents intrusion of dust, muddy water, and the like from the outside, for example, FIG. The following are known.

  That is, this type of dust seal 100 is formed of a metal reinforcing ring 101 and a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) and is integrally provided on the reinforcing ring 101 by adhesion. The reinforcing ring 101 is press-fitted and fixed to the inner peripheral surface 201b of the opening end of the shaft hole 201a provided in the housing 201 of the device, and the seal lip 102a formed on the seal body 102 is By being slidably in close contact with the outer peripheral surface of a shaft (for example, a hinge pin) 202 inserted through the hole 201a, the dust or muddy water of the outside A enters the bearing portion (not shown) inside the shaft hole 201a. (For example, refer to the following patent document).

JP 2012-21648 A

  However, since the conventional dust seal 100 is obtained by adhering the seal body 102 made of a rubber-like elastic material to the reinforcing ring 101, in the manufacture thereof, the pretreatment process of the reinforcing ring 101 for bonding, There is a problem that the manufacturing cost is increased due to the material cost due to use or the bonding process. In order to reduce the manufacturing cost, it can be considered that the reinforcing ring 101 is not used. However, in this case, the fixing force of the shaft hole 201a to the inner peripheral surface 201b of the opening end is remarkably reduced, and the shaft 202 rotates together. In addition, the outer peripheral portion of the seal body 102 may be worn due to friction with the opening end portion of the housing 201.

  The present invention has been made in view of the above points, and a technical problem thereof is to provide a dust seal having a structure capable of preventing co-rotation without adhering a seal body to a reinforcing ring. .

  As a means for effectively solving the above technical problem, a dust seal with a reinforcing ring according to the invention of claim 1 is formed of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity) and a base portion. A seal body having a seal lip extending from the base and having a tip slidably in contact with the outer peripheral surface of the shaft inserted through the shaft hole of the housing, and press-contacting the base and forming the base in the shaft hole It consists of a reinforcement ring press-contacted to the made seal mounting part.

  A dust seal with a reinforcing ring according to a second aspect of the present invention is the dust seal according to the first aspect, wherein the reinforcing ring is press-fitted into the inner peripheral surface of the seal mounting portion, and is attached to one end surface of the base portion of the seal body. It has a flange part which press-contacts and the other end surface of this base part is press-contacted to the end surface of the said seal mounting part.

  A dust seal with a reinforcing ring according to a third aspect of the present invention is the structure according to the second aspect, wherein a concave portion or a convex portion is formed on one end surface of the base portion of the seal body.

  According to a fourth aspect of the present invention, there is provided a dust seal with a reinforcing ring, wherein the seal main body and the reinforcing ring are engaged with each other in the circumferential direction.

  A dust seal with a reinforcing ring according to a fifth aspect of the present invention is the dust seal according to the first aspect, wherein the reinforcing ring is pressed against the inner peripheral surface of the base portion of the seal body and the outer peripheral surface of the base portion is the inner periphery of the seal mounting portion. It is pressed against the surface.

  A dust seal with a reinforcing ring according to a sixth aspect of the present invention is the structure according to the fifth aspect, wherein a concave portion or a convex portion is formed on the pressure contact surface with the housing at the base portion of the seal body.

  According to the dust seal with the reinforcing ring according to the present invention, the base portion of the seal body is pressed against the housing by the reinforcing ring to secure the fixing force with the housing and prevent co-rotation with the shaft, thereby reinforcing the seal body. It is not necessary to adhere to the ring, and therefore can be provided at low cost.

  Moreover, since the recessed part or convex part formed in the base part of the seal | sticker main body absorbs the deformation force to the seal lip side resulting from the stress by the compression of the said base part, the stable sealing performance can be ensured. Moreover, since the said recessed part or convex part improves the frictional force with a reinforcement ring or a housing, this also ensures the fixing force with a housing and can contribute to co-rotation prevention with a shaft.

1 is a half cross-sectional view of a separated state before mounting, showing a first embodiment of a dust seal with a reinforcing ring according to the present invention cut along a plane passing through an axis O; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a mounting state showing a first embodiment of a dust seal with a reinforcing ring according to the present invention by cutting along a plane passing through an axis O; It is a half sectional view of the separation state before mounting which shows a second embodiment of a dust seal with a reinforcing ring according to the present invention by cutting along a plane passing through an axis O. It is a half section view of the wearing state which cuts and shows a 2nd embodiment of a dust seal with a reinforcement ring concerning the present invention by a plane which passes along axis O. It is a half section view of the wearing state which cuts and shows a 3rd embodiment of a dust seal with a reinforcement ring concerning the present invention by a plane which passes along axis O. It is a half section view of the wearing state which cuts and shows a 4th embodiment of a dust seal with a reinforcement ring concerning the present invention by a plane which passes along axis O. In 1st embodiment of the dust seal with a reinforcement ring which concerns on this invention, the state which produced the deformation | transformation in the seal body is a half cross-sectional view cut by a plane passing through the axis O. FIG. 10 is a half sectional view of a separated state before mounting, showing a fifth embodiment of a dust seal with a reinforcing ring according to the present invention by cutting along a plane passing through an axis O; It is a half sectional view of the separation state before mounting which shows a 6th embodiment of a dust seal with a reinforcement ring concerning the present invention by cutting along a plane which passes along axis O. FIG. 10 is a partial arrow view seen from the X direction in FIG. 9. It is a half sectional view of the separation state before mounting which shows a seventh embodiment of a dust seal with a reinforcing ring according to the present invention by cutting along a plane passing through an axis O. It is a half sectional view of the separation state before mounting which shows an eighth embodiment of a dust seal with a reinforcing ring according to the present invention by cutting along a plane passing through an axis O. It is a half sectional view of the wearing state which cuts and shows a 9th embodiment of a dust seal with a reinforcement ring concerning the present invention by a plane which passes along an axis. It is a half sectional view of the wearing state which shows an example of the conventional dust seal by cutting along the plane which passes along axis O.

  Hereinafter, a preferred embodiment in the case of applying a dust seal with a reinforcing ring according to the present invention as a sealing means such as a hinge pin for connecting an arm and a bucket in a construction machine such as a hydraulic excavator or a backhoe so as to be capable of relative swinging will be described. The description will be given with reference.

  1 and 2 show a first embodiment. Reference numeral 3 is a housing, and reference numeral 4 in FIG. 2 is a shaft (for example, a hinge pin). A shaft hole 31 is formed in the housing 3, and the shaft 4 is rotatably inserted into the shaft hole 31 via a bearing (not shown). A seal mounting portion 32 is concentrically extended at the opening end of the shaft hole 31, and the seal mounting portion 32 rises from the inner peripheral surface of the shaft hole 31 in a plane perpendicular to the shaft center O. 32a and an inner peripheral surface 32b extending in a cylindrical shape from the outer diameter end toward the outer end surface of the housing 3.

  The dust seal with a reinforcing ring according to the first embodiment includes a seal body 1 formed of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity), and the seal body 1 is held in a housing 3. It consists of a reinforcing ring 2.

  The seal body 1 has a cross-sectional shape (cross-sectional shape shown in the figure) cut along a plane passing through the axis O and has a substantially rectangular shape, and an axially inner end of the base portion 11 toward the outer side in the axial direction. The seal lip 12 extends in the shape of a conical cylinder having a small diameter at the tip and is slidably in close contact with the outer peripheral surface of the shaft 4.

  The reinforcing ring 2 is made of a highly rigid material such as metal, and is pressed against the press-fitting cylinder portion 21 and an end surface 11a that extends from the outer end portion toward the inner diameter side and that is on the outer side in the axial direction of the base portion 11 of the seal body 1. It has a possible flange part 22. As shown in FIG. 1, the outer peripheral surface of the press-fit cylinder portion 21 has a slightly larger diameter than the inner peripheral surface 32 b of the seal mounting portion 32 of the housing 3, that is, the press-fit cylinder portion 21 has an inner periphery of the seal mounting portion 32. The surface 32b can be press-fitted with an appropriate tightening allowance δ.

The inner diameter of the press-fit cylinder portion 21 of the reinforcing ring 2 is substantially equal to the outer diameter of the base portion 11 of the seal body 1 and the inner length L ₂ from the tip of the press-fit cylinder portion 21 of the reinforcement ring 2 to the flange portion 22. has a shorter than the axial length L ₁ of the base portion 11 of the seal body 1. In the actual size _L 1 -L ₂ are as above 0.1 mm.

  Therefore, the base portion 11 of the seal body 1 can be held in the accommodated state on the inner periphery of the press-fit cylinder portion 21 of the reinforcing ring 2, and in the mounted state shown in FIG. 2, the seal between the flange portion 22 of the reinforcing ring 2 and the housing 3. The flange portion 22 of the reinforcing ring 2 is compressed in the axial direction between the end surfaces 32 a of the mounting portion 32, that is, the end surface 11 b which is in the axial direction inner side of the base portion 11 and presses against the end surface 11 a which is the axially outer side of the base portion 11. Is in pressure contact with the end surface 32 a of the seal mounting portion 32 of the housing 3.

  The dust seal with the reinforcing ring according to the first embodiment having the above-described configuration is, for example, the base 11 of the seal body 1 and the seal lip 12 on the flange 22 side of the reinforcing ring 2 from the unmounted state shown in FIG. In the state where the reinforcing ring 2 is accommodated in the inner periphery of the press-fitting cylinder part 21, the seal-fitting cylinder part 21 is kept until the tip abuts against the end surface 32 a of the seal-fitting part 32 of the housing 3. By press-fitting into the inner peripheral surface 32b of 32, it can be mounted as shown in FIG.

  In this mounted state, the base portion 11 of the seal body 1 is held by the seal mounting portion 32 of the housing 3 via the reinforcing ring 2, and the tip inner diameter portion of the seal lip 12 facing the outside A of the housing 3 is the outer periphery of the shaft 4. By being slidably brought into close contact with the surface, dust or muddy water from the outside A is prevented from entering a bearing portion (not shown) in the shaft hole 31 of the housing 3.

  Here, the base 11 of the seal body 1 includes the flange portion 22 of the reinforcing ring 2 in which the press-fit cylinder portion 21 is press-fitted into the inner peripheral surface 32 b of the seal mounting portion 32 of the housing 3 and the end surface 32 a of the seal mounting portion 32 of the housing 3. The both end surfaces 11a and 11b of the base portion 11 are pressed against the flange portion 22 of the reinforcing ring 2 and the end surface 32a of the seal mounting portion 32 of the housing 3 by the reaction force, and the outer peripheral surface 11c is also compressed. Since it bulges out and comes into pressure contact with the inner peripheral surface of the press-fit cylinder portion 21 of the reinforcing ring 2, the friction torque between the housing 3 and the reinforcing ring 2 acts on the seal lip 12 as it slides on the shaft 4. It is sufficiently larger than the friction torque. Therefore, although the reinforcing ring 2 and the seal body 1 are not bonded, the seal body 1 follows the shaft 4 by the friction torque acting on the seal lip 12 as the shaft 4 slides. Can be effectively prevented.

  Next, FIGS. 3 and 4 show a second embodiment. In this embodiment, the difference from the first embodiment described above is that the press-fit cylinder portion 21 of the reinforcing ring 2 is pressed against the inner peripheral surface 11d of the base portion 11 of the seal body 1 and the outer peripheral surface of the base portion 11. 11c is brought into pressure contact with the inner peripheral surface 32b of the seal mounting portion 32 of the housing 3.

Specifically, as shown in FIG. 3, the seal body 1 has a base 11 formed in a cylindrical shape having a thinner radial thickness t than that of the first embodiment, and a seal mounting portion of the housing 3. 32 inner circumferential surface 32b inside diameter _{D 3} of, when the outer diameter of the press-fit tube portion 21 of the reinforcing ring 2 and _{D 2,} the radial thickness t of the base _11, rather than _(D 3 -D ₂₎ / ₂ It is slightly larger. In the actual size, t-{(D ₃ -D ₂ ) / 2} is 0.1 mm or more.

  Therefore, in the mounting state shown in FIG. 4, the base 11 of the seal body 1 has a radial direction between the press-fitting cylinder portion 21 of the reinforcing ring 2 press-fitted into the inner periphery thereof and the inner peripheral surface 32 b of the seal mounting portion 32 of the housing 3. That is, the outer peripheral surface of the press-fitting cylinder portion 21 of the reinforcing ring 2 is pressed against the inner peripheral surface 11 d of the base portion 11, and the outer peripheral surface 11 c of the base portion 11 contacts the inner peripheral surface 32 b of the seal mounting portion 32 of the housing 3. It comes to come in pressure contact. Further, an intermediate portion 13 extending in the radial direction is formed between the base portion 11 of the seal body 1 and the seal lip 12, and this intermediate portion 13 is an end face of the flange portion 22 of the reinforcing ring 2 and the seal mounting portion 32. It is sandwiched between 32a.

  The dust seal with a reinforcing ring according to the second embodiment having the above-described configuration is, for example, from the unmounted state shown in FIG. 3, first, the base 11 of the seal body 1 and the seal lip 12 the flange portion of the reinforcing ring 2. After inserting into the seal mounting portion 32 of the housing 3 so as to face the 22 side, the press-fitting cylinder portion 21 of the reinforcing ring 2 is disposed on the inner periphery of the base portion 11, and the flange portion 22 is disposed on the intermediate portion 13 side of the seal body 1. By press-fitting so that it faces, it can be mounted as shown in FIG.

  In this mounted state, the base portion 11 and the intermediate portion 13 of the seal body 1 are sandwiched between the reinforcing ring 2 and the seal mounting portion 32 of the housing 3, and the tip inner diameter portion of the seal lip 12 facing the outside A of the housing 3. Is slidably brought into close contact with the outer peripheral surface of the shaft 4 to prevent dust or muddy water from the outside A from entering a bearing portion (not shown) in the shaft hole 31 of the housing 3.

  Here, the base portion 11 of the seal body 1 is compressed in the radial direction between the press-fit cylinder portion 21 of the reinforcing ring 2 press-fitted into the inner periphery thereof and the inner peripheral surface 32b of the seal mounting portion 32 of the housing 3, Due to the force, the inner peripheral surface 11d and the outer peripheral surface 11c of the base portion 11 are pressed against the press-fitting cylinder portion 21 of the reinforcing ring 2 and the inner peripheral surface 32b of the seal mounting portion 32, and the intermediate portion 13 of the seal body 1 is also in the reinforcing ring 2. Between the flange portion 22 and the end surface 32 a of the seal mounting portion 32, the friction torque between the housing 3 and the reinforcing ring 2 acts on the seal lip 12 as the shaft 4 slides. It is sufficiently larger than the torque. Therefore, although the reinforcing ring 2 and the seal body 1 are not bonded, the seal body 1 follows the shaft 4 by the friction torque acting on the seal lip 12 as the shaft 4 slides. Can be effectively prevented.

  Next, FIG. 5 shows a third embodiment. In this embodiment, in the first embodiment described above, the seal body 1 has a seal lip 12 facing the outside A of the housing 3 and an oil seal lip 14 facing the opposite side. It is. Further, the bases of the seal lip 12 and the anti-oil seal lip 14 are continuous with the end portion of the reinforcing ring 2 on the flange portion 22 side of the base portion 11 through the intermediate portion 13 extending in the radial direction.

  In this embodiment, as in the first embodiment, the base portion 11 of the seal body 1 is a flange portion of the reinforcing ring 2 in which the press-fit cylinder portion 21 is press-fitted into the inner peripheral surface 32b of the seal mounting portion 32 of the housing 3. 22 and the end surface 32a of the seal mounting portion 32 of the housing 3 are compressed in the axial direction, and due to the reaction force, the both end surfaces 11a and 11b of the base portion 11 become the flange portion 22 of the reinforcing ring 2 and the seal mounting portion 32 of the housing 3. Since the outer peripheral surface 11c also bulges out and comes into pressure contact with the inner peripheral surface of the press-fit cylinder portion 21 of the reinforcing ring 2, the reinforcing ring 2 and the seal body 1 are not bonded, but the shaft Accordingly, it is possible to effectively prevent the seal body 1 from following the shaft 4 and co-rotating by the friction torque acting on the seal lip 12 and the oil-resistant seal lip 14 when sliding with the seal 4.

  FIG. 6 shows a fourth embodiment. In this embodiment as well, as in the third embodiment, the seal body 1 has a seal lip 12 facing the outside A of the housing 3 and an oil seal lip 14 facing the opposite side. Is continuous with the end portion of the reinforcing ring 2 on the flange portion 22 side of the base portion 11 through the intermediate portion 13 extending in the radial direction.

  Further, the base 11 of the seal body 1 has an inner peripheral surface of the press-fit cylinder portion 21 of the reinforcing ring 2 whose tip is in contact with an end surface 32 a of the seal mounting portion 32 and an inner peripheral surface of the seal mounting portion 32 of the housing 3. The inner peripheral surface 11d and the outer peripheral surface 11c of the base portion 11 are pressed against the press-fitting cylinder portion 21 of the reinforcing ring 2 and the inner peripheral surface 32b of the seal mounting portion 32 by the reaction force. The intermediate portion 13 of the seal body 1 is sandwiched between the flange portion 22 of the reinforcing ring 2 and the plate 33 fastened to the outer end surface of the housing 3 with bolts 34, whereby the housing 3, the plate 33, and the reinforcement The friction torque with the ring 2 is sufficiently larger than the friction torque acting on the seal lip 12 as the shaft 4 slides. Therefore, although the reinforcing ring 2 and the seal body 1 are not bonded, the seal body 1 follows the shaft 4 by the friction torque acting on the seal lip 12 as the shaft 4 slides. Can be effectively prevented.

  By the way, as in the first embodiment shown in FIGS. 1 and 2 or the third embodiment shown in FIG. 5, the base 11 of the seal body 1 is replaced with the flange 22 of the reinforcing ring 2 and the seal of the housing 3. In the case of compressing in the axial direction between the end surfaces 32a of the mounting portion 32, as shown in FIG. 7, the bending deformation in which the axially inner side (end surface 11b side) of the base portion 11 is pushed out toward the inner diameter side by the compression reaction force. Therefore, there is a concern that a predetermined contact state of the seal lip 12 with respect to the shaft 4 cannot be obtained. In the second embodiment shown in FIGS. 3 and 4, the base portion 11 of the seal body 1 is compressed in the radial direction between the press-fitting cylinder portion 21 of the reinforcing ring 2 and the inner peripheral surface 32 b of the seal mounting portion 32. There is a concern that the reaction force caused by this acts to push the seal lip 12 toward the inner diameter side through the intermediate portion 13 and a predetermined contact state of the seal lip 12 with the shaft 4 cannot be obtained. The fifth embodiment shown in FIG. 8, the sixth embodiment shown in FIGS. 9 and 10, and the seventh embodiment shown in FIG. 11 prevent such deformation of the base 11. is there.

  Among these, in the fifth embodiment shown in FIG. 8, a plurality of groove-shaped recesses 15 extending in the radial direction are provided on the end surface 11a which is the outer side in the axial direction of the base 11 of the seal body 1 in the first embodiment. They are formed at equal intervals in the circumferential direction.

  If comprised in this way, the stress by the base part 11 of the seal body 1 being compressed in the axial direction between the flange part 22 of the reinforcing ring 2 and the end face 32a of the seal mounting part 32 of the housing 3 will be absorbed by the recess 15. Therefore, not only can the influence on the seal lip 12 be mitigated, but also the friction torque against the flange portion 22 of the reinforcing ring 2 is increased, so that the co-rotation of the seal body 1 is effectively prevented even with a small amount of compression. be able to.

  Further, in the sixth embodiment shown in FIG. 9 and FIG. 10, a plurality of groove-like recesses 16 extending in the radial direction are circumferentially provided on the outer peripheral surface 11c of the base 11 of the seal body 1 in the second embodiment. They are formed at equal intervals in the direction.

  If comprised in this way, the stress by the base part 11 of the seal body 1 being compressed in the radial direction between the press-fitting cylinder part 21 of the reinforcing ring 2 and the inner peripheral surface 32b of the seal mounting part 32 will be absorbed by the concave part 16. Therefore, not only can the influence on the seal lip 12 be mitigated, but also the friction torque with respect to the inner peripheral surface 32b of the seal mounting portion 32 increases, so that the seal body 1 can be effectively rotated even with a small amount of compression. Can be prevented.

  Further, in the seventh embodiment shown in FIG. 11, a plurality of ridges 17 extending in the radial direction are provided on the end surface 11a on the outer side in the axial direction of the base 11 of the seal body 1 in the first embodiment in the circumferential direction. They are formed at equal intervals. The ridges 17 correspond to the ridges described in claim 3.

  Also in this case, the stress due to the axial compression of the base portion 11 of the seal body 1 between the flange portion 22 of the reinforcing ring 2 and the end surface 32a of the seal mounting portion 32 of the housing 3 is concentrated on the ridges 17. Therefore, not only can the influence on the seal lip 12 be mitigated, but also the friction torque with respect to the flange portion 22 of the reinforcing ring 2 is increased, so that the seal body 1 can be effectively rotated even with a small amount of compression. Can be prevented.

  Next, FIG. 12 shows an eighth embodiment. In this embodiment, among the outer peripheral surface 11c of the base portion 11 of the seal body 1 in the first embodiment, a plurality of engagement protrusions (one in the figure) are provided near the end on the inner side in the axial direction (on the end surface 11b side). Are formed at equal intervals in the circumferential direction, and a plurality of engagements that can be engaged in the circumferential direction by fitting with the engagement protrusions 18 at the tips of the press-fitting cylindrical portions 21 of the reinforcing ring 2 The notches 23 are formed at equal intervals in the circumferential direction. The engagement protrusion 18 and the engagement notch 23 correspond to the engagement means described in claim 4.

  In the dust seal with a reinforcing ring according to the eighth embodiment having such a configuration, for example, the base 11 of the seal body 1 and the seal lip 12 face the flange 22 side of the reinforcing ring 2 from the unmounted state shown in the figure. In this manner, the press-fit cylinder 21 is housed in the inner periphery of the press-fit cylinder portion 21 of the reinforcing ring 2 and the engagement notch 23 and the engagement protrusion 18 are fitted together. It can be mounted by press-fitting into the inner peripheral surface 32b of the seal mounting portion 32 until it contacts the end surface 32a of the mounting portion 32.

  In this mounted state, the base portion 11 of the seal body 1 has both end surfaces 11 a and 11 b at the flange portion 22 of the reinforcing ring 2 in which the press-fitting cylinder portion 21 is press-fitted into the inner peripheral surface 32 b of the seal mounting portion 32 of the housing 3. And the end face 32a of the seal mounting portion 32 of the housing 3 and the engagement protrusion 18 of the base 11 is engaged with the engagement notch 23 of the reinforcement ring 2 in the circumferential direction. Although 1 is non-adhered, co-rotation of the seal body 1 due to the friction torque acting on the seal lip 12 as it slides with the shaft 4 is reliably prevented.

  Further, FIG. 12 shows an eighth embodiment. In this embodiment, the base portion 11 of the seal body 1 in the first embodiment has a larger radial thickness than an axial thickness.

  In other words, according to this configuration, the contact area between the both end faces 11a and 11b of the base portion 11 is increased, so that it is difficult to rotate together, and the axially inner side (end surface 11b side) of the base portion 11 is pushed toward the inner diameter side by the compression reaction force. Bending deformation is less likely to occur.

DESCRIPTION OF SYMBOLS 1 Seal main body 11 Base 15, 16 Concave part 17 Convex strip 18 Engagement protrusion (engaging means)
12 Seal lip 13 Intermediate part 14 Oil seal lip 2 Reinforcement ring 21 Press-fit cylinder part 22 Flange part 23 Engagement notch (engagement means)
3 Housing 31 Shaft hole 32 Seal mounting part 4 Shaft

Claims (6)

  Molded with rubber-like elastic material (rubber material or synthetic resin material with rubber-like elasticity) and extended from the base and the tip is slidably in contact with the outer peripheral surface of the shaft inserted through the shaft hole of the housing A dust seal with a reinforcing ring, comprising: a seal body having a seal lip; and a reinforcing ring that press-contacts the base portion and presses the base portion against a seal mounting portion formed in the shaft hole.   The reinforcing ring is press-fitted into the inner peripheral surface of the seal mounting portion, and has a flange portion that presses against one end surface of the base portion of the seal body and presses the other end surface of the base portion against the end surface of the seal mounting portion. The dust seal with a reinforcing ring according to claim 1.   The dust seal with a reinforcing ring according to claim 2, wherein a concave portion or a convex portion is formed on one end surface of the base portion of the seal body.   The dust seal with a reinforcing ring according to claim 2 or 3, further comprising engagement means for engaging the seal body and the reinforcing ring with each other in the circumferential direction.   2. The dust seal with a reinforcing ring according to claim 1, wherein the reinforcing ring presses the inner peripheral surface of the base portion of the seal body and presses the outer peripheral surface of the base portion against the inner peripheral surface of the seal mounting portion. .   6. The dust seal with a reinforcing ring according to claim 5, wherein a concave portion or a convex portion is formed on a pressure contact surface of the base portion of the seal body with the seal mounting portion.

Images