CN110878830A - Sealing structure and speed reducer - Google Patents

Abstract

The invention discloses a sealing structure which comprises a shaft part and a sealing ring, wherein at least part of the outer peripheral surface of the shaft part is provided with a sealing ring protective layer, the sealing ring is sleeved on the outer peripheral surface of the shaft part, and the sealing ring is sleeved on the outer peripheral surface of the shaft part, which is provided with the sealing ring protective layer. The contact part of the sealing ring protective layer and the shaft part is treated by sand blasting or adhesive coating, so that the sealing ring protective layer and the shaft part are better bonded. The sealing ring is separated from the shaft part through the sealing ring protective layer, so that the heat generated by friction in the rotating process of the sealing ring and the shaft part is reduced, and the aging speed of the sealing ring is reduced. The invention also provides a speed reducer which comprises the sealing structure, the first end cover and the second end cover, wherein the sealing rings at least comprise two parts which are respectively arranged at the two axial ends of the shaft part, and the sealing structures are respectively sleeved in the first end cover and the second end cover through the sealing rings, so that the continuous working time of the speed reducer can be prolonged, and the consumption of the speed reducer is reduced.

Description

Sealing structure and reducer

technical field

The present invention relates to the technical field of sealing, in particular to a sealing structure and a reducer with the sealing structure.

Background technique

At present, in order to prevent oil leakage of the reducer during rotation, the shaft is generally sealed by using a sealing ring, which is embedded in the outer peripheral surface of the shaft. In actual operation, when the shaft rotates at a high speed, due to the sealing ring and the shaft The contact surface rubs and heats up, resulting in gradual wear of the sealing ring. In addition, with the increase of frictional heat, the temperature of the shaft portion will gradually rise, thereby accelerating the aging and wear of the sealing ring.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention proposes a sealing structure, which can reduce the friction between the sealing ring and the shaft portion, thereby reducing frictional heat generation. In addition, the present invention also proposes a speed reducer with such a sealing structure.

An embodiment of the present invention provides a sealing structure, including a shaft portion and a sealing ring, the outer peripheral surface of the shaft portion is at least partially provided with a sealing ring protection layer, and the sealing ring is sleeved on the outer peripheral surface of the shaft portion provided with the sealing ring protection layer .

Optionally, an adhesive layer is further provided between the protective layer of the sealing ring and the outer peripheral surface of the shaft portion.

Optionally, the material of the protective layer of the sealing ring is Teflon paint.

Optionally, the spray thickness of the protective layer of the sealing ring is below 0.1 mm.

Optionally, an elastic member is arranged in the sealing ring, and the elastic member drives the sealing ring to expand at least toward the inner side of the radial direction of the sealing ring.

An embodiment of the present invention also provides a speed reducer, which includes the above-mentioned sealing structure and a first end cover and a second end cover, and the sealing ring protection includes at least two places, which are respectively arranged at both ends of the shaft portion in the axial direction. , the sealing structure is respectively embedded in the first end cover and the second end cover through the sealing ring.

The sealing structure and the reducer of the present invention have at least the following beneficial effects: since a sealing ring protective layer is provided between the shaft portion and the sealing ring, the sealing ring avoids direct contact and friction with the shaft portion when rotating. In addition, since there is a protective layer of the sealing ring between the sealing ring and the shaft portion, the frictional force of rotation can be reduced, the frictional heat generation can be reduced, and the wear of the sealing ring can be reduced.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a shaft region according to an embodiment of the present invention;

2 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the shaft region according to an embodiment of the present invention;

4 is an enlarged schematic view of a sealing ring protection layer area according to an embodiment of the present invention;

5 is a schematic cross-sectional view of an embodiment of the present invention.

Detailed ways

The concept of the present invention and the technical effects produced will be clearly and completely described below with reference to the embodiments, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts are all within the scope of The scope of protection of the present invention.

In the description of the embodiments of the present invention, if the orientation description is involved, for example, the orientation or positional relationship indicated by "up", "down", "front", "rear", "left", "right", etc. is based on the accompanying drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. limits.

In the description of the embodiments of the present invention, if a feature is referred to as "set", "fixed", "connected", "installed" on another feature, it can be directly set, fixed, or connected on another feature, It can also be indirectly disposed, fixed, connected, mounted on another feature. In the description of the embodiments of the present invention, if "several" is involved, it means more than one; if it involves "plurality", it means more than two; ", should be understood as not including this number, if it involves "above", "below", "within", it should be understood as including this number. If it refers to "first" and "second", it should be understood to be used to distinguish technical features, but not to indicate or imply relative importance, or to imply indicate the number of indicated technical features or to imply indicate the indicated The sequence of technical features.

Example 1

Figures 3 to 5 show an embodiment of the present invention. The shaft portion 11 is processed from a steel bar, and the shaft portion 11 is, for example, a camshaft. As shown in Fig. 5 , the first support at the front of the shaft portion 11 At the surface 171, a sealing ring 121 is embedded; at the second supporting surface 172 at the rear of the shaft portion 11, a sealing ring 122 is embedded. As shown in FIGS. 3 and 4 , in order to reduce the frictional force between the shaft portion 11 and the sealing rings 121 and 122 , the surfaces of the first supporting surface 171 and the second supporting surface 172 are respectively provided with a sealing ring protective layer 181 , 182. Further, the material of the sealing ring protection layers 181 and 182 is, for example, Teflon paint, and the sealing ring protection layers 181 and 182 are directly attached to the surfaces of the first supporting surface 171 and the second supporting surface 172 . Since the Teflon coating has a low coefficient of friction, during the rotational movement, the frictional force between the sealing rings 121 and 122 and the outer peripheral surface of the shaft portion 11 on which the protective layers 181 and 182 of the sealing ring with the Teflon material are attached is also Thereby, the wear of the sealing rings 121 and 122 is reduced. Further, since the Teflon coating has good non-sticking properties, the sealing rings 121 and 122 are prevented from adhering to the outer peripheral surface of the shaft portion 11 . Further, since the Teflon coating itself has strong wear resistance and heat resistance, it is beneficial to reduce the heat transfer between the sealing rings 121, 122 and the shaft portion 11, thereby reducing the sealing rings 121, 122. of wear. The sealing rings 121 and 122 are provided with elastic members. During the rotation process, the sealing rings 121 and 122 expand toward the radially inner side of the sealing rings 121 and 122 under the driving of the elastic members. The pressure of the elastic members causes the sealing rings 121 and 122 to expand. It is kept in contact with the outer peripheral surface of the shaft portion 11 .

Preferably, as shown in FIGS. 4 and 5 , in order to achieve a higher sealing effect and ensure that the assembly of the sealing rings 121 and 122 is not affected, the thickness a of the sealing ring protection layers 181 and 182 is controlled to be less than 0.1 mm. In order to improve the bonding ability of the first supporting surface 171 and the second supporting surface 172 and the sealing ring protection layers 181 and 182 attached subsequently, when the shaft portion 11 is processed, the adhesive layer on the first supporting surface 171 and the second supporting surface 172 is Be sandblasted.

Example 2

In this embodiment, on the basis of Embodiment 1, the processing methods of the first support surface 171 and the second support surface 172 are changed. When processing the shaft portion 11, an adhesive, such as ethylenic polymer, epoxy resin, unsaturated polyester, etc., is applied on the adhesive layer between the first support surface 171 and the second support surface 172. In this way, it is also possible to The bonding ability of the first support surface 171, the second support surface 172 and the sealing ring protection layers 181, 182 is improved.

Example 3

Figures 1 and 2 show an embodiment of the present invention. As shown in Figure 1, the shaft portion 11 is processed from a steel bar. For example, the outer peripheral surface of the front portion of the camshaft has a groove portion 141. There is a groove 142 on the outer peripheral surface of the rear part of the shaft part 11. As shown in FIG. 2, a sealing ring 121 is embedded in the groove part 141 at the front part of the shaft part 11, and a sealing ring is embedded in the groove part 142 at the rear part of the shaft part 11. 122. The sealing ring protectors 131 and 132 are processed by injection molding at the groove parts 141 and 142. The sealing ring protectors 131 and 132 avoid the direct contact between the sealing rings 121 and 122 and the shaft part 11, so that the heat generated by friction can be avoided. reduce. Further, injection molding is performed in the grooves 141 and 142, and the sealing ring protection members 131 and 132 are fixed to the shaft portion 11 as a whole, so that the sealing ring protection members 131 and 132 are fitted with the shaft portion 11 to ensure the sealing effect. In addition, the widths of the grooves 141 and 142 are larger than the widths of the sealing ring protectors 131 and 132. Since the heat generated by friction will cause the sealing ring protectors 131 and 132 to expand during the rotation, the widths of the grooves 141 and 142 are set to The width of the sealing ring protection members 131 and 132 is larger than that of the sealing ring protection members 131 and 132, so that the sealing ring protection members 131 and 132 can still be embedded in the grooves 141 and 142 after expansion, thereby maintaining a good sealing effect.

Further, the material of the sealing ring protection parts 131 and 132 can be selected from plastic parts such as nylon, polyoxymethylene (POM), polypropylene (PP) and the like. The sealing rings 121 and 122 are provided with elastic members. During the rotation process, the sealing rings 121 and 122 expand toward the radially inner side of the sealing rings 121 and 122 under the driving of the elastic members. The pressure of the elastic members causes the sealing rings 121 and 122 to expand. It is kept in contact with the outer peripheral surface of the shaft portion 11 .

Example 4

As shown in FIGS. 1 and 2 , on the basis of Embodiment 3, the grooves 141 and 142 are set as V-shaped grooves in this embodiment. The shaft 11 is, for example, a camshaft. The outer peripheral surface of the rear part of the shaft part 11 has a V-shaped groove, the V-shaped groove of the front part of the shaft part 11 is embedded with a sealing ring 121, and the V-shaped groove of the rear part of the shaft part 11 is embedded with a sealing ring 122 , in order to make the sealing ring protectors 131 and 132 fit with the shaft portion 11, the sealing ring protectors 131 and 132 are processed by injection molding at the V-shaped grooves, and the width of the V-shaped grooves is larger than the width of the sealing ring protectors 131 and 132. width.

Further, the material of the sealing ring protection parts 131 and 132 can be selected from plastic parts such as nylon, polyoxymethylene (POM), polypropylene (PP) and the like. The sealing rings 121 and 122 are provided with elastic members. During the rotation process, the sealing rings 121 and 122 expand toward the radially inner side of the sealing rings 121 and 122 under the driving of the elastic members. The pressure of the elastic members causes the sealing rings 121 and 122 to expand. It is kept in contact with the outer peripheral surface of the shaft portion 11 .

Example 5

FIGS. 2 and 3 show an embodiment of the present invention. In this embodiment, the shaft portion 11 is, for example, a camshaft. The outer peripheral surface of the front portion of the shaft portion 11 has a groove portion 141 , and the outer peripheral surface of the rear portion of the shaft portion 11 has a groove portion 141 . There is a groove part 142 , a sealing ring 121 is embedded in the groove part 141 at the front part of the shaft part 11 , and a sealing ring 122 is embedded in the groove part 142 at the rear part of the shaft part 11 . Sealing ring protection layers 181 and 182 are attached in the grooves 141 and 142. The material of the sealing ring protection layers 181 and 182 is Teflon paint. Since Teflon paint has good heat insulation and wear resistance, it is It is beneficial to reduce the transfer of heat generated by friction between the sealing rings 121 , 122 and the shaft portion 11 . Further, the sealing rings 121 and 122 are provided with elastic members. During the rotation, the sealing rings 121 and 122 are driven by the elastic members to expand toward the inner side of the radial direction of the sealing rings 121 and 122. The pressure of the elastic members causes the sealing rings to expand. 121 and 122 are kept in contact with the outer peripheral surface of the shaft portion 11 . The difference between this embodiment and Embodiment 3 is that the sealing ring protection members 131 and 132 in Embodiment 3 are changed to sealing ring protection layers 181 and 182 . Since the grooves 141 and 142 have a certain depth, the sealing ring protection layers 181 and 182 can have a relatively large adhesion thickness, so the heat insulation effect is better.

Example 6

Referring to FIG. 2 , in the reducer 1 of the present embodiment, such as a harmonic reducer, the sealing ring 121 is embedded in the first end cover 15 of the reducer 1 , such as the end cover of the flexible wheel, and the sealing ring 122 is embedded in the speed reducer. The second end cover 16 of the device 1 is, for example, inside the wheel end cover, the inner hole of the first end cover 15 and the outer ring of the sealing ring 121 are attached to each other, and the inner hole of the second end cover 16 and the outer ring of the sealing ring 122 are mutually Fitting, in this way, the interior of the reducer 1 is isolated from the external environment, so as to prevent impurities in the air from entering the reducer 1, resulting in loss of internal components. During the rotation, the sealing rings 121 and 122 are kept in contact with the sealing ring protection members 131 and 132 which are injected outside the shaft portion 11 through the built-in elastic member. Further, the sealing ring protectors 131 and 132 are plastic parts such as nylon, polyoxymethylene (POM), polypropylene (PP), etc. Furthermore, since the thermal conductivity of plastic materials is lower than that of metal materials, during the rotational friction process The heat generated in the sealing ring is less transferred to the sealing rings 121, 122, so that the outlet temperature of the sealing rings 121, 122 is reduced, the aging speed of the sealing rings 121, 122 is reduced, and the service life of the sealing rings 121, 122 is also prolonged. On the one hand, since the reducer 1 is a fully sealed structure, the reducer 1 cannot work for a long time due to the heat generated by the rotation, and the existence of the sealing ring protectors 131 and 132 reduces the heat generated by friction and improves the reducer to a certain extent. On the other hand, due to the reduced friction between the sealing rings 121, 122 and the shaft 11, the power consumption of the reducer 1 is reduced, and its starting torque is also reduced.

Example 7

As shown in FIG. 5 , this embodiment provides a reducer 1 , such as a harmonic reducer, the sealing ring 121 of which is embedded in the first end cover 15 of the reducer 1 , such as the end cover of the flexible wheel, and the sealing ring 122 The inner hole of the first end cover 15 and the outer ring of the sealing ring 121 are fitted to each other, and the inner hole of the second end cover 16 and the sealing ring 122 The outer rings fit each other. In this way, the interior of the reducer 1 is isolated from the external environment, so as to avoid the loss of components caused by the entry of impurities in the air into the reducer 1 . The sealing rings 121 and 122 are provided with elastic members. During the rotation process, the sealing rings 121 and 122 expand toward the radially inner side of the sealing rings 121 and 122 under the driving of the elastic members. The pressure of the elastic members causes the sealing rings 121 and 122 to expand. It is kept in contact with the outer peripheral surface of the shaft portion 11 . The sealing rings 121 and 122 are respectively embedded in the first supporting surface 171 and the second supporting surface 172 on the outer periphery of the shaft portion 11 , and the surfaces of the first supporting surface 171 and the second supporting surface 172 are respectively attached with sealing ring protective layers 181 and 182 . The material of the sealing ring protection layers 181 and 182 is Teflon paint. As shown in FIG. 4 , preferably, the thickness a of the sealing ring protection layers 181 and 182 is 0.1 mm or less. In order to improve the bonding ability between the first support surface 171 and the second support surface 172 and the sealing ring protection layers 181 and 182 attached subsequently, when the shaft portion 11 is processed, the surfaces of the first support surface 171 and the second support surface 172 are bonded The layer is sandblasted or coated with adhesive. Since the reducer 1 is a fully sealed structure, the reducer 1 cannot work for a long time due to the heat generated by the rotation, and the existence of the protective layers 181 and 182 of the sealing ring reduces the heat generated by friction and improves the performance of the reducer 1 to a certain extent. Continuous working time; further, due to the reduced friction between the sealing rings 121, 122 and the shaft portion 11, the power consumption of the reducer 1 is reduced, and its starting torque is also reduced.

Example 8

As shown in FIG. 2 , this embodiment provides a reducer 1 , such as a harmonic reducer, the sealing ring 121 of which is embedded in the first end cover 15 of the reducer 1 , such as a flexible wheel end cover, and the sealing ring 122 The inner hole of the first end cover 15 and the outer ring of the sealing ring 121 are fitted to each other, and the inner hole of the second end cover 16 and the sealing ring 122 The outer rings fit each other. The sealing ring 121 is embedded in the V-shaped groove at the front of the shaft portion 11 , and the sealing ring 122 is embedded in the V-shaped groove at the rear of the shaft portion 11 . In order to make the sealing ring protectors 131 and 132 closely fit with the shaft portion 11, the sealing ring protectors 131 and 132 are processed by injection molding at the V-shaped groove 1. During the rotation process, the sealing rings 121 and 122 pass through the built-in elastic parts. The drive is kept in contact with the sealing ring protectors 131 and 132 that are injected outside the shaft portion 11 . Further, the sealing ring protectors 131 and 132 are plastic parts such as nylon, polyoxymethylene (POM), polypropylene (PP), etc. Furthermore, since the thermal conductivity of plastic materials is lower than that of metal materials, during the rotational friction process Less heat is generated in the air, and the aging speed of the sealing rings 121 and 122 is reduced, thereby prolonging the service life.

Example 9

As shown in FIG. 2 and FIG. 5 , in the reducer 1 of the present embodiment, such as a harmonic reducer, the sealing ring 121 is nested inside the first end cover 15 of the reducer 1 , such as a flexible wheel end cover, to seal The ring 122 is embedded in the second end cover 16 of the reducer 1, such as the inner side of the wheel end cover, the inner hole of the first end cover 15 and the outer ring of the sealing ring 121 are fitted to each other, and the inner hole of the second end cover 16 is in contact with the outer ring of the sealing ring 121. The outer rings of the sealing ring 122 are attached to each other. Sealing ring protection layers 181 and 182 are attached in the grooves 141 and 142 , and the material of the sealing ring protection layers 181 and 182 is Teflon paint. Since the grooves 141 and 142 have a certain depth, the sprayed thickness of the sealing ring protection layers 181 and 182 is larger, and the heat insulation effect is better. During the rotation, the sealing rings 121 and 122 are kept in contact with the sealing ring protection layers 181 and 182 which are injected outside the shaft portion 11 through the drive of the built-in elastic member. Since the reducer 1 is a fully sealed structure, the heat generated by the rotation makes the reducer 1 unable to work for a long time, and the existence of the sealing ring protective layers 181 and 182 reduces the heat generated by friction and improves the continuity of the reducer 1 to a certain extent. working time; further, as the friction between the sealing rings 121, 122 and the shaft portion 11 is reduced, the power consumption of the reducer 1 is reduced, and its starting torque is also reduced.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the technical field, various modifications can be made without departing from the purpose of the present invention. kind of change. Furthermore, the embodiments of the present invention and features in the embodiments may be combined with each other without conflict.

Claims (6)

1. The sealing structure is characterized by comprising a shaft part and a sealing ring, wherein at least part of the outer peripheral surface of the shaft part is provided with a sealing ring protective layer, and the sealing ring is sleeved on the outer peripheral surface of the shaft part, which is provided with the sealing ring protective layer.

2. The seal structure according to claim 1, wherein an adhesive layer is further provided between the seal ring protective layer and the outer peripheral surface of the shaft portion.

3. The sealing structure of claim 1 or 2, wherein the sealing ring protection layer is made of teflon.

4. The seal structure of claim 1, wherein the seal ring protective layer has a thickness of 0.1mm or less.

5. A sealing arrangement according to any of claims 1, 2 or 4, wherein a resilient member is provided within the sealing ring, the sealing ring being urged by the resilient member to expand at least towards a radially inner side of the sealing ring.

6. The reducer is characterized by comprising

A first end cap;

a second end cap; and

the sealing structure of any one of claims 1 to 5, wherein the sealing rings include at least two portions, the sealing rings are respectively disposed at two axial ends of the shaft portion, and the sealing structure is respectively inserted into the first end cover and the second end cover through the sealing rings.

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