TWI547643B - Oil seal structure - Google Patents

Description

Oil seal structure

The invention relates to an oil seal structure, in particular to an adaptability for increasing the oil seal for axial wear, so as to increase the service life of the shaft center.

According to the general oil seal, it is sleeved between the shaft hole of the valve body and the shaft center, and the fluid leakage of the valve body and the foreign matter infiltration of the valve body are prevented, and the conventional oil seal 1' is a hollow ring body, such as As shown in the seventh figure, the inner ring 12' of the soft material is extended on the inner side of the outer ring 11' of the hard material, and the outer edge of the inner surface of the inner ring 12' is provided with a protruding dust lip 13', and the inner edge is provided. There is a raised main sealing lip 14', and a concave annular groove 15' is formed between the inner side of the ring 11' and the inner ring 12' outside the oil seal 1'.

However, since the axial center of the valve body reciprocates in the shaft hole for a long period of time, the shaft core is rubbed against the inner wall of the shaft hole for a long time, causing wear of the shaft center. Therefore, the oil seal system cannot be effectively stopped after the shaft core is worn for a period of time. Leakage, causing the valve body to operate inaccurately, thus reducing the service life of the valve body, increasing maintenance time and cost.

In view of the above, the present invention can provide an oil seal structure in which the width of the elastic portion is slightly longer than the width of the convex portion of the bearing ring and the flexibility of the elastic portion, so that the abutting portion is elastically contacted with the shaft center without Replacing the axis of wear to achieve effective protection against fluid leakage and improving the service life of the shaft center is painstakingly researched and designed to improve the adaptability of the oil seal to the axis of wear. Creative motives.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide an oil seal structure that increases the adaptability of an oil seal to axial wear.

A second object of the present invention is to provide an oil seal structure that can increase the service life of the shaft.

Another object of the present invention is to provide an oil seal structure which can reduce axial frictional resistance.

In order to achieve the above object, the present invention provides an oil seal structure, which is a hollow annular body, comprising: a radial surrounding portion formed on the outer ring of the oil seal, the outer surface of the snap portion is formed An arc-shaped convex surface, and an inner annular surface which is in close contact with the first concave portion of the two bearing rings is disposed at one end of the convex surface; one end of the elastic portion is extended into the inner portion a ring surface; and a radial portion formed around the shaft portion of the oil seal inner ring, wherein one end of the abutting portion is extended to the other end of the elastic portion, and the other end of the abutting portion forms a convex surface Wherein the width of the elastic portion is slightly larger than the width of the convex portion of the bearing ring.

The oil seal structure as described above, wherein the oil seal is disposed between two bearing rings of a valve body.

The oil seal structure as described above, wherein the oil seal is made of an elastic material.

The oil seal structure as described above, wherein the upper end and the lower end of the latching portion are provided with an upper top surface and a lower bottom surface, and the upper top surface and the lower bottom surface are in close contact with the first concave portion of the bearing rings.

The oil seal structure as described above, wherein the thickness of the click portion is greater than the thickness of the abutment portion.

The oil seal structure as described above, wherein the thickness of the elastic portion is slightly smaller than the height of the space formed between the convex portions of the bearing rings.

In the oil seal structure as described above, the thickness of the elastic portion is smaller than the thickness of the latch portion and the abutting portion, and a concave ring groove is formed on the upper side and the lower side of the elastic portion.

The oil seal structure as described above, wherein the convex surface of the abutting portion is in a circular arc shape.

The oil seal structure as described above, wherein the bearing rings are respectively provided with a second recess, and the height of the space formed between the second recesses is slightly larger than the thickness of the abutment portion.

The oil seal structure as described above, wherein the bearing ring system can be a bearing seat.

Therefore, the present invention utilizes the flexibility of the elastic portion and the width of the elastic portion to be slightly larger than the width of the convex portion of the bearing ring, so that the abutting portion is elastically contacted with the shaft center, and the arc is formed by the abutting portion. The convex surface of the shape can improve the adaptability of the oil seal to the axial wear, improve the service life of the shaft, effectively prevent fluid leakage and reduce the frictional resistance of the shaft.

Other features and embodiments of the invention will be further understood from the following detailed description of the drawings.

Referring to FIG. 1A to FIG. 1D, the oil seal 1 structure of the preferred embodiment of the present invention is a hollow annular body, comprising: a latch portion 11, an elastic portion 12 and an abutting portion 13 The latching portion 11 is formed on the outer circumference of the oil seal 1 in a radial direction, and the outer surface of the latching portion 11 forms an arc-shaped convex surface 111, wherein the convex surface 111 is opposite to the convex surface 111. One end is provided with an inner annular surface 112 which is in close contact with the first concave portion 232 of the two bearing rings 23 (please refer to the fourth figure at the same time); and one end of the elastic portion 12 is extended into the latch portion 11 a toroidal surface, wherein the width of the elastic portion 12 is slightly larger than the width of the convex portion 231 of the bearing ring 23; the abutting portion 13 is formed radially around the inner ring of the oil seal 1, wherein one end of the abutting portion 13 The other end of the elastic portion 12 is extended, and the other end of the abutting portion 13 forms a convex surface 131 having an arc shape.

The oil seal 1 is made of an elastic material, and the elastic portion 12 of the oil seal 1 is telescopically movable. The upper end and the lower end of the latch portion 11 are provided with an upper top surface 113 and a lower bottom surface 114. The upper top surface 113 and the lower bottom surface 114 are in close contact with the first concave portion 232 of the bearing ring 23 (please refer to the fourth figure at the same time), and the thickness of the locking portion 11 is greater than the abutting portion 13 a thickness, wherein the thickness of the latching portion 11 and the abutting portion 13 respectively match the first recessed portion 232 and the second recessed portion 233 of the bearing ring 23; and the thickness of the elastic portion 12 is slightly smaller than the convexity of the bearing rings 23 The height of the space formed between the portions 231 is such that there is a telescopic space between the elastic portion 12 and the convex portion 231 of the bearing ring 23, wherein the elastic portion 12 has a thickness smaller than the latch portion 11 and the abutment portion 13 The thickness of the elastic portion 12 forms a concave ring groove (not shown) on the upper side and the lower side; wherein the bearing rings 23 are respectively provided with a second recess 233, and between the second recesses 233 The height of the formed space is slightly larger than the thickness of the abutting portion 13.

Please also refer to the second to fourth figures, which is a schematic view showing the state of use of the oil seal 1 of the present invention applied to the valve body 2, wherein the valve body 2 includes a shaft center 21, a shaft hole 22, and a plurality of bearings. The ring 23, the plurality of bearing blocks 24 and the fluid inlet and outlet 25, and the oil seal 1 is disposed between the two bearing rings 23 of the valve body 2, wherein the bearing ring 23 can also be replaced by a bearing seat 24, that is, the oil seal The bearing ring 23 can be disposed between the bearing ring 23 and the bearing housing 24 (as shown in the second figure), wherein the bearing ring 23 includes a convex portion 231, a first concave portion 232 and a second concave portion 233; When the shaft hole 22 of the valve body 2 is not completely entered (as shown in the third figure), the shaft 21 is in an open state, and the fluid F in the valve body 2 is entered into the shaft hole 22 by the fluid inlet and outlet 25 on the right side. Finally, it flows out from the fluid inlet and outlet 25 on the left side.

When the shaft 21 completely enters the shaft hole 22, as shown in the fifth and sixth figures, the shaft 21 presses the shaft portion 13 of the oil seal 1 to compress the abutting portion 13 to the right side. The elastic portion 12 keeps the abutting portion 13 elastically in contact with the shaft core 21, and the top surface 113 and the lower bottom surface 114 of the latch portion 11 are contacted by the first recess portion 232 of the bearing ring 23 and pressed. The abutting portion 13 elastically contacts the shaft core 21, wherein the upper surface 113 and the lower bottom surface 114 of the latching portion 11 are in close contact with the first recessed portion 232 of the bearing ring 23, so that the fluid F is subjected to The latch portion 11 and the abutment portion 13 are blocked from entering the shaft hole 22, and fluid leakage can be prevented.

When the shaft 21 is worn over a long period of time, that is, the radius of the shaft 21 becomes smaller, the width of the elastic portion 12 of the oil seal 1 of the present invention can be slightly larger than the width of the convex portion 231 of the bearing ring 23. And the flexibility characteristic, the abutting portion 13 can interlock the elastic portion 12 to adjust the telescopic adjustment, and the abutting portion 13 is continuously elastically contacted with the axial center 21, so that the fluid F is blocked by the abutting portion 13, so that it is not because The radius of the shaft 21 is reduced, so that a gap is formed between the abutting portion 13 and the shaft 21, thereby improving the adaptability of the oil seal to the axial wear, reducing the axial frictional resistance, and preventing fluid leakage. The effect.

Wherein, when the axis 21 contacts the convex surface 131 of the abutting portion 13, since the convex surface 131 of the present invention is designed as an arc-shaped convex surface 131, the axial center 21 can be avoided by using the arc-shaped design. The abutment portion 13 is contacted and pressed to cause breakage of the abutment portion 13.

In summary, according to the above disclosure, the present invention can achieve the novel intended purpose, which utilizes the flexibility of the elastic portion and the width of the elastic portion to be slightly larger than the width of the convex portion of the bearing ring. The abutting portion is elastically contacted with the shaft center, and the arc-shaped convex surface formed by the abutting portion is used to improve the adaptability of the oil seal to the shaft center wear, improve the service life of the shaft core, effectively prevent fluid leakage, and reduce the shaft. The effect of the heart friction resistance does have undoubtedly practical value, but it has the industrial utilization, novelty and progressive elements, and the invention patent application is filed according to law.

The above is only the preferred embodiment of the present invention, and the equivalent design changes made by the scope of the present invention should be covered by the technical scope of the present invention.

1. . . Oil seal

11. . . Card department

111. . . Protruding surface

112. . . Inner annulus

113. . . Top surface

114. . . Lower bottom

12. . . Elastic part

13. . . Abutment

131. . . Protruding surface

2. . . Valve body

twenty one. . . Axis

twenty two. . . Shaft hole

twenty three. . . Bearing ring

231. . . Convex

232. . . First recess

233. . . Second recess

twenty four. . . Bearing housing

25. . . Fluid inlet and outlet

F. . . fluid

Figure 1A is a perspective cross-sectional view of a preferred embodiment of the present invention.

The first B is a perspective view of a preferred embodiment of the present invention.

The first C-picture is a cross-sectional view taken along the A-A' direction of the first B-picture.

The first D diagram is a partial enlarged view of the first C diagram.

The second drawing is a perspective view showing the state of use of the preferred embodiment of the present invention.

The third figure is a schematic view of the axis open state of the preferred embodiment of the present invention.

The fourth figure is a partial enlarged view of the third figure.

The fifth drawing is a schematic view of the axis closed state of the preferred embodiment of the present invention.

The sixth figure is a partial enlarged view of the fifth figure.

The seventh figure is a three-dimensional diagram of a conventional oil seal.

1. . . Oil seal

11. . . Card department

12. . . Elastic part

13. . . Abutment

twenty three. . . Bearing ring

Claims (3)

An oil seal structure, the oil seal is a hollow annular body, comprising: a snap portion formed radially around the outer ring of the oil seal, wherein the outer surface of the snap portion forms an arc-shaped convex portion And an inner ring surface which is in close contact with the first concave portion of the two bearing rings, and an upper top surface and a lower bottom surface of the upper end portion and the lower end of the latching portion are provided on the one end of the protruding surface The top surface and the bottom bottom surface are in close contact with the first concave portion of the bearing ring; an elastic portion has one end extending to the inner annular surface of the latch portion, and the thickness of the elastic portion is slightly smaller than the bearing rings a height of a space formed between the convex portions; and an abutting portion formed radially around the inner ring of the oil seal, wherein one end of the abutting portion is extended to the other end of the elastic portion, and the The other end of the shaft portion forms a convex surface, and the thickness of the locking portion is greater than the thickness of the abutting portion, and the thickness of the elastic portion is smaller than the thickness of the locking portion and the abutting portion, and the elastic portion is a concave ring groove is formed on the upper side and the lower side; wherein the width of the elastic portion is slightly To the width of the convex portion of the bearing ring, whereby the use of this elastic portion of scalability so that the contact portion in contact with the shaft axis elasticity. The oil seal structure according to claim 1, wherein the convex surface of the abutting portion has an arc shape. The oil seal structure of claim 1, wherein the bearing rings are respectively provided with a second recess, and the height of the space formed between the second recesses is slightly larger than the thickness of the abutting portion. .