JPH0590046U - End face seal - Google Patents

Abstract

(57) [Summary] [Object] To provide an end face seal capable of scraping off foreign matter such as fluid and sludge adhering to an auxiliary region formed on the outer peripheral side of the end face of a rotary seal ring. [Structure] A slinger 4 attached to the rotary shaft 3 and a fixed seal ring 7 attached to the housing 1 are provided. The fixed seal ring 7 contacts the end face of the outward flange 6 of the slinger 4 and the outward flange 6 In the end face seal in which the auxiliary region N is formed on the outer peripheral side of the end face 10, by providing the annular seal lip 9 having an outer diameter smaller than the outer diameter of the auxiliary region N,
A plurality of scraper lips 12 that come into contact with is provided along the circumferential direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an end face seal used for various parts such as automobiles, construction machines and other industrial equipment.

[0002]

[Prior Art]

 FIG. 2 shows a configuration example of a conventional end face seal. A rotary shaft 102 is arranged in a shaft hole 101 of the housing 100, and a slinger 103 as a rotary seal ring is fitted and attached to the rotary shaft 102. The slinger 103 has a cylindrical portion 104 and an outward flange 105.

A fixed seal ring 106 is fitted in the shaft hole 101. The fixed seal ring 106 has a seal body 107 made of a rubber-like elastic body and a metal ring 108 joined to the seal body 107. An annular seal lip 109 inclined toward the outer peripheral side is integrally formed on the inner peripheral side of the seal body 107. A seal ring 110 made of special synthetic fiber is attached to the inner peripheral side of the seal body 107.

In the above structure, the slinger 103 rotates integrally with the rotary shaft 102, and the tip of the seal lip 109 contacts the end surface 111 of the outward flange 105 to form a seal surface. The seal surface seals oil as a fluid in the inside A of the shaft hole 101.

On the other hand, the inner peripheral side of the seal ring 110 is in contact with the cylindrical portion 104 of the slinger 103 to prevent dust and the like from entering from the outside B of the housing 100. Further, the outer diameter of the seal lip 109 is set smaller than the outer diameter of the outward flange 105, and an auxiliary region Q is formed on the outer peripheral side of the end face 111.

By the way, the reason for forming the auxiliary region Q on the outer peripheral side of the end face 111 is as follows. When the tip of the seal lip 109 is displaced to the outer peripheral edge of the slinger 103 due to expansion of the seal lip 109 toward the outer peripheral side due to the temperature of the oil in the inside A or frictional heat or eccentricity of the rotating shaft 102. The contact pressure of the seal lip 109 may be insufficient, or the tip of the seal lip 109 may fall off the end surface 111, which may impair the sealing performance. This problem also occurs due to improper assembly of the fixed seal ring 106 and the slinger 103, deformation, and dimensional error.

The auxiliary area Q serves as an escape area when the tip of the seal lip 109 is displaced to prevent a problem.

[0008]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, the auxiliary area Q oil is likely to adhere. The oil becomes sludge D due to the frictional heat between the seal lip 106 and the slinger 103, causing wear and deterioration of the seal lip 109, which deteriorates the sealability.

The present invention is intended to solve the above problems, and provides an end face seal capable of scraping off foreign matter such as fluid and sludge adhering to an auxiliary region formed on the end face of a rotary seal ring. Has a purpose.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a rotary seal ring attached to a rotary shaft and a fixed seal ring attached to a housing, and the fixed seal ring is in contact with an end surface of the rotary seal ring and is fixed to the rotary seal ring. By providing an annular seal lip with an outer diameter smaller than the outer diameter, an end face seal having an auxiliary region formed on the outer peripheral side of the end face is provided on the outer peripheral side of the seal lip and on the auxiliary region of the end face. Characterized by the provision of a scraping part that comes into contact

[0011]

[Action]

 In the present invention based on the above configuration, the rotary seal ring rotates integrally with the rotary shaft, and the seal lip contacts the end surface of the rotary seal ring to form a seal surface. On the other hand, when the tip of the seal lip is displaced to the outer peripheral side, the auxiliary region absorbs the displacement of the tip of the seal lip, and the contact pressure of the seal surface is secured.

Further, the scraping portion scrapes off the foreign matter attached to the auxiliary region of the end surface of the rotary seal ring.

[0013]

【Example】

 FIG. 1A is a front half sectional view of one embodiment of the present invention, and FIG. 1B is a side sectional view taken along the line EE of FIG. Reference numeral 1 denotes a housing, and a rotary shaft 3 is inserted into a shaft hole 2 of the housing 1. A slinger 4 as a rotary seal ring is attached to the rotary shaft 3. The slinger 4 is made of metal and has a cylindrical portion 5 into which the rotary shaft 3 is fitted, and an outward flange 6 that is bent and formed on one end side of the cylindrical portion 5, that is, on the inside F side of the housing 1.

A fixed seal ring 7 is fitted and fixed at a position corresponding to the cylindrical portion 5 in the shaft hole 2. The fixed seal ring 7 is formed by joining a seal body 8 made of a rubber-like elastic body and a metal ring 9. The inner diameter of the seal body 8 is set to be considerably smaller than the inner diameter of the flange 6.

On the inner circumference of the seal body 8, an annular seal lip 9 having a fixed end on the inner F side is provided by integral molding. This seal lip 9 is inclined toward the inside F, and its free end on the outer peripheral side, that is, the tip of the lip is in contact with the end face 10 of the outward flange 6.

The outer diameter of the seal lip 9 is set to be smaller than the outer diameter of the outward flange 6 as shown in (B). A thread groove 11 is formed on the end surface 10 of the outward flange 6.

Further, a scraper lip 12 as a scraping portion is provided on the outer peripheral edge of the seal lip 9. The scraper lips 12 are integrally vulcanized and molded with the seal lips 9, and a plurality of scraper lips 12 are provided at substantially equal intervals along the circumferential direction. The outer diameter of the scrap lip 12 is set to be substantially the same as the outer diameter of the outward flange 6.

On the other hand, an annular mounting groove 13 is provided at a position on the inner circumference of the seal body 8 and faces the outer side G of the housing 1, and a seal ring 14 made of a special synthetic fiber is provided in the mounting groove 13. It is installed. The inner peripheral side of the seal ring 14 contacts the cylindrical portion 5 and is bent toward the outer G side.

In the above structure, the slinger 4 rotates integrally with the rotary shaft 3, and the tip of the seal lip 9 contacts the end face 10 to form a seal surface. The sealing surface prevents the dust of the outside G from entering the seal lip 9 side.

Further, since the auxiliary region N is formed on the outer peripheral side of the end face 10, there is an error in the radial dimension of the seal lip 9 and the outward flange 6, or a combination of the fixed seal ring and the slinger 4. Due to various conditions such as improper attachment and deformation, eccentricity of the rotating shaft 3, and expansion of the seal lip 9 due to heat, the tip of the seal lip 9 is located on the outer peripheral side relative to the end face 10. Even if it is displaced, the auxiliary region N absorbs the displacement of the seal lip 9 and secures the contact surface pressure of the sealing surface. Therefore, a stable sealing property can be secured.

Even if oil adheres to the auxiliary area N in a scattered state or the oil becomes sludge due to frictional heat between the end surface 10 and the seal lip 9, the scraper lip 12 scratches these foreign matters. Drop it.

Therefore, the material of the seal lip 9 is not deteriorated or worn, and the excellent sealing property can be maintained for a long period of time.

The seal surface formed by the seal ring 14 and the cylindrical portion 5 prevents the dust of the external G from entering the seal lip 9 side.

[0024]

[Effect of the device]

 Since the present invention is configured as described above, when foreign matter adheres to the auxiliary area formed on the outer peripheral side of the end surface of the rotary seal ring, the scraping section scrapes it off.

Therefore, deterioration and wear of the material of the seal lip do not occur, and excellent sealability can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1A is a front half sectional view showing an embodiment of the present invention, and FIG. 1B is a side sectional view taken along the line EE of FIG.

FIG. 2 is a front half sectional view of a conventional example.

[Explanation of symbols]

 1 Housing 2 Shaft Hole 3 Rotating Shaft 4 Slinger (Rotating Seal Ring) 5 Cylindrical Part 6 Outward Flange 7 Rotating Seal Ring 8 Seal Main Body 9 Seal Lip 10 End Face 11 Screw Groove 12 Scraper Lip (Scraping Part) 13 Mounting Groove 14 Seal Ring F Inside G Outside N Auxiliary area

Claims (1)

[Scope of utility model registration request] 1. A rotary seal ring mounted on a rotary shaft and a fixed seal ring mounted on a housing, wherein the fixed seal ring is in contact with an end surface of the rotary seal ring and smaller than the outer diameter of the rotary seal ring. By providing an annular seal lip set to the outer diameter, in an end face seal in which an auxiliary region is formed on the outer peripheral side of the end face, a scraping portion that comes into contact with the auxiliary region of the end face is provided on the outer peripheral side of the seal lip. An end face seal that is characterized by