CN213711870U - Oil seal - Google Patents

Abstract

The utility model provides an oil seal, which is used for being sleeved on a rotating shaft and forming sealing with the rotating shaft, the oil seal comprises a sealing main body, the sealing main body comprises an annular lip, the annular lip extends from the inner side wall of the sealing main body to the center of the shaft, and the annular lip points to the inner cavity of the oil seal from the lip of the oil seal; the annular lip and the rotating shaft are in gapless interference fit; a plurality of annular lips are arranged on the inner side wall of the sealing main body; the annular lips are aligned along the axial direction of the seal body; the plurality of annular lips may form a plurality of lines of defense against gas and liquid leakage. The utility model provides a pair of oil blanket, simple structure, simple to operate has reduced the required precision of installation, has good leak protection effect simultaneously.

Description

Oil seal

Technical Field

The utility model relates to a sealing device's technical field, concretely relates to oil blanket.

Background

At present, the rotary shaft on the market generally uses a high-speed oil seal for the isolation and sealing of gas or liquid, and the high-speed oil seal has the disadvantages of complicated production process, troublesome installation, higher cost, high precision requirement on the rotary shaft, large torsion force to be overcome in driving and more energy consumption. The traditional oil seal is mainly used for preventing leakage of gas (liquid) with high rotating speed, and because the rotating speed is high, the soft rubber is made of wear-resistant rubber and hard metal is added in the soft rubber, the shape is ensured not to be overheated and deformed due to pressure and friction, and the fitting sealing speed of high-speed small vibration is ensured by matching with an annular pressure spring.

1. The traditional oil seal has the defects that the friction force is large, the torsion force is not large per se in low-cost motors during low-speed rotation, and the large friction force seriously influences the service life of a miniature motor.

2. In the traditional oil seal, besides soft rubber, most of the materials also have a tightening spring, and a hard metal sheet is added in the forming of the soft rubber. The production is very troublesome. The installation is usually carried out by means of a jig.

3. When the traditional oil seal is combined and sealed with a rotating shaft, large-area and large-area friction is caused, the size of a spring contraction ring is small, the requirement on the size precision of the rotating shaft under different air pressures (hydraulic pressures) is relatively high, and the tolerance is generally in the micron order, so that the qualification rate is low, and the universality on different air pressures (hydraulic pressures) is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims at providing an oil blanket, simple structure, simple to operate has reduced the required precision of installation, has good leak protection effect simultaneously.

In order to achieve the purpose, the utility model provides an oil seal which is used for being sleeved on a rotating shaft and forming sealing with the rotating shaft, the oil seal comprises a sealing main body, the sealing main body comprises an annular lip, the annular lip extends from the inner side wall of the sealing main body to the center of the shaft, and the annular lip points to the inner cavity of the oil seal from the lip of the oil seal; the annular lip and the rotating shaft are in gapless interference fit.

According to another embodiment of the invention, the annular lip is fixed to the end of the sealing body.

According to another embodiment of the present invention, the inner side wall of the sealing body is arranged with a plurality of annular lips; the annular lips are aligned along the axial direction of the seal body; the plurality of annular lips may form a plurality of lines of defense against gas and liquid leakage.

According to another embodiment of the present invention, at least one annular protrusion is further disposed on the outer side of the sealing body, and the thickness of the annular protrusion gradually increases from the lip of the oil seal to the inner cavity of the oil seal; when receiving atmospheric pressure or hydraulic pressure annular bellied shape of falling V, annular elasticity structure can the external pressure, and the inner wall to outside casing more, and the leakproofness can be strengthened, and better sealing atmospheric pressure or hydraulic pressure prevent that gas or liquid from leaking.

According to another embodiment of the present invention, the annular protrusion has an inclined surface inclined from the lip of the oil seal to the inner cavity of the oil seal; the tail end of the inclined plane is extruded with the inner wall of the outer shell, so that the annular bulge plays a role of a one-way valve, a leakage-proof effect is achieved, and meanwhile, the contact area of the oil seal and the shell is reduced, and friction force is reduced.

According to another embodiment of the present invention, the plurality of annular protrusions are arranged along an axial direction of the sealing body; a plurality of annular bulges can increase a plurality of defense lines and prevent oil or gas from leaking.

According to another embodiment of the present invention, the annular protrusion is in a non-clearance interference fit with the inner wall of the outer housing; the sealing effect is improved.

According to another embodiment of the present invention, the oil seal is integrally formed; the utility model discloses by flexible glue injection moulding, can use at once to seal in the pivot under the low-speed environment, shortened production processes, practice thrift the human cost.

According to another embodiment of the present invention, the oil seal is made of a soft rubber material; the soft rubber material is softer, only can easily pack into the machine with the hand during the installation, need not install with the help of anchor clamps, greatly reduced manpower and materials cost.

The oil seal is sleeved on the rotating shaft outside, the annular lip and the rotating shaft are in gapless interference fit, and the outer shell is sleeved outside the oil seal.

The utility model adopts the annular lip, the annular lip extends to the center of the shaft from the inner side wall of the sealing main body, the annular lip points to the inner cavity of the oil seal from the lip mouth of the oil seal, when the air pressure or the hydraulic pressure is pressed towards the oil seal, the annular structure of the annular lip can be pressed outwards and pressed more towards the rotating shaft, the sealing performance of the contact surface can be enhanced at the moment, the better sealing effect is achieved, and the gas or the liquid is prevented from leaking from the rotating shaft; the contact surface between the annular lip and the rotating shaft is small, so that friction is reduced, the service life of the micromotor can be prevented from being seriously influenced by large friction force, and meanwhile, friction overheating deformation can be reduced; the utility model discloses the structure is light, and the installation is simple, need not to adopt annular pressure spring to guarantee the laminating leakproofness to greatly reduced is to the required precision of countershaft, reduces the frictional force of overcoming high-speed oil blanket and the problem of too much consumption energy, the cost is reduced.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the installation of an oil seal according to the first embodiment;

FIG. 2 is a schematic view of the overall structure of the oil seal according to the first embodiment;

FIG. 3 is a schematic view of the internal structure of the oil seal according to the first embodiment;

fig. 4 is a schematic view of the internal structure of the oil seal of the second embodiment.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Example one

The present embodiment provides an oil seal, as shown in fig. 1-3, for fitting over a rotating shaft 1 and forming a seal with the rotating shaft 1; the oil seal 2 is sleeved in the outer shell 3 and fixed by a bearing 4, and the outer wall of the oil seal 2 and the inner wall of the shell 3 form sealing; the oil seal 2 comprises a seal main body 21, the seal main body 21 comprises an annular lip 5 and three annular bulges 6, the annular lip 5 extends from the inner side wall of the seal main body 21 to the axial center thereof, and the annular lip 5 points to the inner cavity of the oil seal 2 from the lip of the oil seal 2; the annular lip 5 is in clearance-free interference fit with the rotating shaft 1, and the annular lip 5 is fixedly arranged at the end part of the sealing main body 21.

The thickness of the annular bulge 6 is gradually increased from the lip of the oil seal 2 to the inner cavity of the oil seal 2; the cross section of the annular protrusion 6 is triangular, and in other embodiments, the cross section of the annular protrusion 6 can be in a trapezoidal shape or other irregular shapes; the annular bulge 6 is made of soft rubber, and the annular bulge 6 can also be made of soft plastic or other sealing materials with elasticity; the annular bulge 6 is in clearance-free interference fit with the inner wall of the outer shell 3; when the gas or liquid is required to be prevented from leaking at the rotating speed of 200RPM, the gas or liquid is filled from the inner cavity direction of the sealing main body 21, when the inverted V-shaped annular bulge 6 is subjected to gas pressure or hydraulic pressure, the annular elastic structure is pressed outwards and is pressed towards the inner wall of the outer machine shell 3, the sealing performance is enhanced, the gas pressure or the hydraulic pressure is better sealed, and the gas or liquid is prevented from leaking; the annular bulge 6 is provided with an inclined surface 61 which inclines from the lip of the oil seal 2 to the inner cavity direction of the oil seal 2; the end of the inclined surface 61 is pressed against the inner wall of the outer housing 3, so that the annular protrusion 6 functions as a check valve to prevent leakage, and the contact area of the oil seal 2 with the housing 3 is reduced to reduce friction.

Three annular protrusions 6 are arranged along the axial direction of the seal body 21; a plurality of defense lines can be added to the plurality of annular bulges 6, so that oil or gas is prevented from leaking; in other embodiments, the number of the annular protrusions 6 may be one, forming a single layer of leakage preventing lines, but the leakage preventing effect is weak.

In the embodiment, the annular lip 5, the annular bulge 6 and the sealing main body 21 are integrally formed and are formed by injection molding of soft rubber, so that the rotary shaft sealing device can be immediately used for sealing a rotary shaft in a low-speed environment, the production process is shortened, and the labor cost is saved; the oil seal 2 is made of soft rubber; the soft rubber material is softer, only can easily pack into the machine with the hand during the installation, need not install with the help of anchor clamps, greatly reduced manpower and materials cost.

The oil seal 2 is sleeved on the external rotating shaft 1, the annular lip 5 and the rotating shaft 1 are in gapless interference fit, and the external shell 3 is sleeved outside the oil seal 2; in the embodiment, the annular lip 5 is adopted, the annular lip 5 extends from the inner side wall of the sealing main body 21 to the axial center of the sealing main body, the annular lip 5 points to the inner cavity of the oil seal 2 from the lip of the oil seal 2, when air pressure or hydraulic pressure is pressed towards the oil seal 2, the annular structure of the annular lip 5 is pressed outwards and is pressed towards the rotating shaft 1, at the moment, the sealing performance of a contact surface is enhanced, a better sealing effect is achieved, and gas or liquid is prevented from leaking from the rotating shaft 1; the contact surface of the annular lip 5 and the rotating shaft 1 is small, so that friction is reduced, the service life of the micro motor can be prevented from being seriously influenced by large friction force, and meanwhile, friction overheating deformation can be reduced; the structure of the embodiment is light, the installation is simple, and the joint sealing degree is ensured without adopting an annular pressure spring; the air pressure or the hydraulic pressure is pressed towards the inner side of the oil seal 2, the outer side of the oil seal is simultaneously pressed outwards, the sealing pressure between the annular bulge 6 and the inner wall of the machine shell 3 is increased, the gas or the liquid is prevented from leaking outwards from the inner wall of the machine shell 3, and a good sealing and leakage-proof effect is achieved.

Example two

FIG. 4 shows a second embodiment, wherein the same or corresponding parts as the first embodiment are provided with reference numerals communicating with the first embodiment; in contrast to the first embodiment, the inner side wall of the sealing body 21 is lined with three annular lips 5; the annular lips 5 are aligned along the axial direction of the seal body 21; the plurality of annular lips 5 can form a plurality of lines of defense to prevent gas and liquid from leaking out, thereby achieving a multi-layer leak-proof effect.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications without departing from the scope of the present invention, i.e. all equivalent modifications made according to the present invention should be covered by the scope of the present invention.

Claims (9)

1. An oil seal is used for being sleeved on a rotating shaft and forming sealing with the rotating shaft, and comprises a sealing main body and is characterized in that the sealing main body comprises an annular lip, the annular lip extends from the inner side wall of the sealing main body to the center of the shaft of the sealing main body, and the annular lip points to the inner cavity of the oil seal from the lip of the oil seal; and the annular lip is in clearance-free interference fit with the rotating shaft.

2. An oil seal as defined in claim 1, wherein said annular lip is fixedly secured to an end portion of said seal body.

3. An oil seal according to claim 1, wherein a plurality of said annular lips are arranged on the inner side wall of said seal body; the annular lips are aligned along an axial direction of the seal body.

4. An oil seal as defined in claim 1, wherein the outer side of the seal body is further provided with at least one annular protrusion, and the thickness of the annular protrusion gradually increases from the lip of the oil seal to the inner cavity of the oil seal.

5. An oil seal as defined in claim 4, wherein said annular projection is provided with a slope inclined from the lip of said oil seal toward the inner chamber of said oil seal.

6. An oil seal as defined in claim 4, wherein a plurality of said annular projections are arranged along an axial direction of said seal body.

7. An oil seal as defined in claim 4, wherein said annular projection has a no-gap interference fit with the inner wall of the outer casing.

8. An oil seal as defined in claim 1, wherein said oil seal is formed in one piece.

9. An oil seal as defined in claim 1, wherein the oil seal is of soft rubber material.

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