CN213655672U

CN213655672U - Sealing mechanism and gear box

Info

Publication number: CN213655672U
Application number: CN202022480263.0U
Authority: CN
Inventors: 胡中原; 杨坤
Original assignee: Nanjing High Speed and Accurate Gear Group Co Ltd
Current assignee: Nanjing High Speed and Accurate Gear Group Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-07-09
Anticipated expiration: 2030-10-29

Abstract

The application provides a sealing mechanism and gear box relates to sealed technical field, sets up in treating sealing device, includes: an accommodating member formed with a mounting hole; a shaft member penetrating the mounting hole, the sealing mechanism sealing a space defined by an inner side portion of the mounting hole and an outer side portion of the shaft member; the sealing mechanism includes: a shielding member provided in the mounting hole and having a holding hole through which the shaft member passes; a first seal member at least partially retained by the retaining hole, the first seal member for sealing a space defined by the retaining hole and the shaft member; the first seal member is formed with at least one disconnected position in the circumferential direction, and portions of the first seal member located on both sides in the circumferential direction of the disconnected position are detachably connected. The application provides a sealing mechanism has guaranteed effectively to have accelerated dismouting efficiency when sealed effect, is applied to it the gear box, especially can deal with the occasion of periodic dismouting.

Description

Sealing mechanism and gear box

Technical Field

The application relates to the technical field of sealing, in particular to a sealing mechanism and a gear box.

Background

A gearbox is a transmission mechanism that generally includes a housing, an input shaft, and an output shaft. Typically, portions of the input shaft and portions of the output shaft are exposed outside of the gearbox to facilitate connection of other mechanisms. In the above-described mounting of the input shaft and the output shaft, it is necessary to provide a mounting hole in the housing, and the input shaft or the output shaft penetrates through the mounting hole, and thus, the mounting hole needs to be further sealed.

In the prior art, the mounting hole and the shaft (namely the input shaft and the output shaft) are usually sealed by commonly matching the transparent cover and the sealing piece, but the situation that the gear box is periodically disassembled is difficult, namely the disassembly and the assembly are not facilitated.

SUMMERY OF THE UTILITY MODEL

A first object of the present application is to provide a sealing mechanism to achieve high disassembly and assembly efficiency; a second object of the present application is to provide a gearbox comprising a sealing mechanism as above.

In a first aspect, the present application provides a sealing mechanism disposed on a device to be sealed, the device to be sealed including:

an accommodating member formed with a mounting hole;

a shaft member penetrating the mounting hole, the sealing mechanism sealing a space defined by an inner side portion of the mounting hole and an outer side portion of the shaft member;

the sealing mechanism includes:

a shielding member provided in the mounting hole and having a holding hole through which the shaft member passes;

a first seal member at least partially retained by the retaining hole, the first seal member for sealing a space defined by the retaining hole and the shaft member;

the first seal member is formed with at least one disconnected position in the circumferential direction, and portions of the first seal member located on both sides of the disconnected position in the circumferential direction are detachably connected.

Preferably, the shielding member includes at least two portions detachably connected in a radial direction of the shaft member.

Preferably, the sealing mechanism further comprises:

a second sealing member provided to the shaft member;

a mating surface that mates with the second sealing member to further seal a space defined by the retaining bore and the shaft member.

Preferably, the shielding member includes a body portion, the holding hole is formed at the body portion, and the holding hole includes:

a first holding surface and a second holding surface both formed as cylindrical surfaces, the first holding surface being away from the mounting hole with respect to the second holding surface;

a third retention surface intersecting both the first retention surface and the second retention surface, the first seal member being commonly retained by one of the first retention surface and the second retention surface, and the third retention surface.

Preferably, the first retaining surface is formed with a larger diameter relative to the second retaining surface, the first seal member being retained by the first and third retaining surfaces;

the sealing mechanism further comprises an intermediate member, wherein an intermediate hole part for the shaft member to penetrate through is formed in the intermediate member, and the intermediate member is detachably arranged on the side part of the main body part far away from the mounting hole;

the diameter of the intermediate hole portion is smaller than the diameter of the first retaining surface;

the intermediate member includes a portion connected to each of the shielding members, respectively, and the fitting surface is formed on the intermediate member.

Preferably, the second retaining surface is formed with a larger diameter relative to the first retaining surface, the first seal member being retained by the second and third retaining surfaces;

the mating surface is formed on a side of the body portion remote from the mounting hole.

Preferably, the roughness of the mating surface is configured as ra0.4 to ra0.8, the hardness of the mating surface is configured to be greater than or equal to HRC 35;

the first sealing member is formed as an oil seal, the second sealing member is formed as a seal ring, and the seal ring is formed with a seal lip;

the oil seal is configured to have only an oil seal structure, and the seal lip is engaged with the mating surface to be commonly used for dust prevention.

Preferably, the shielding member further comprises:

a radial flange formed on an outer side portion of the main body portion in a radial direction of the shaft member;

a positioning flange, a part of which is formed on a side of the main body portion near the mounting hole, and another part of which is formed on a side of the radial flange near the mounting hole; the positioning flange is used for being embedded into the mounting hole, so that the radial flange abuts against the outer edge of the mounting hole.

In a second aspect, the present application provides a gearbox comprising a sealing mechanism as described above, the device to be sealed being formed as a housing of the gearbox;

preferably, the shaft member and the first seal member are fitted to each other, the roughness of the surface of the shaft member fitted to the first seal member is configured to be ra0.4 to ra0.8, and the hardness is configured to be greater than or equal to HRC 50.

The application provides a sealing mechanism, being located of its first sealing member the part of disconnection position both sides in week is connected with the detachable mode, has effectively accelerated the dismouting efficiency when having guaranteed sealed effect, is applied to it the gear box, especially can deal with the occasion of periodic dismouting.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 shows a schematic view of a cross-sectional view of the sealing mechanism of the present application;

fig. 2 shows a schematic view of a transparent cover of the sealing mechanism of the present application.

Reference numerals:

1-transparent cover; 11-a body portion; 12-an annular flange; 13-the radial outer edge; 14-a first retaining surface; 15-a second retaining surface; 16-a third retaining surface; 17-upper partially permeable cover; 18-lower partial transparent cover; 19-a flange portion;

2-oil sealing; 3, pressing a plate; 4-sealing ring; 5-sealing lip; 6-oil side; 7-gas side; 8-shaft member.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

As shown in fig. 1 and 2, the sealing mechanism provided in this embodiment includes a transparent cover, an oil seal, a pressure plate, and a sealing ring, and the structure and the operation principle of the above components will be described in detail below. Although mentioned in the background section, the structure of the object sealed by the sealing mechanism will be briefly described below for the specific description in the present embodiment.

The seal mechanism in the present embodiment may be applied to a gear box, and taking an input shaft or an output shaft of the gear box as an example (hereinafter, collectively referred to as a shaft member 8, and an outer side portion of the shaft member 8 is schematically shown in fig. 1), a box body of the gear box may be provided in advance with a mounting hole (the gear box is not shown in the drawing), and the shaft member 8 may extend along an axis of the mounting hole and penetrate through the mounting hole such that a portion of the shaft member 8 itself is exposed to the outside of the box body. In one example, the mounting hole may be defined by a section of a cylindrical surface, the so-called axial direction of the mounting hole being the axial direction of the section of the cylindrical surface. Therefore, the object to be sealed by the sealing mechanism is a space to be sealed defined by a portion of the outer side portion of the shaft member 8 and a portion of the cylindrical surface. The shaft member 8 may be formed in a cylindrical shape and supported on a cylindrical surface by a bearing such as a self-aligning roller bearing, in which case the axis of the shaft member 8 may be regarded as coinciding with the axis of the cylindrical surface.

In addition, since the transparent cover 1 includes the main body portion 11 formed in a plate shape, and the main body portion 11 may be formed with a holding hole through which the shaft member 8 penetrates, the transparent cover 1 is substantially formed in a substantially ring shape. To further elaborate on the specific structure of the transparent cover 1, appropriate directions will be specified below to assist the following description. Still referring to fig. 1, as mentioned above, the sealing mechanism in the present embodiment may be applied to a gear box whose case body normally holds lubricating oil for lubricating the transmission of internal gears, and according to this feature, the side of the sealing mechanism close to the inside of the case body is referred to as an oil side 6 and the side of the sealing mechanism far from the inside of the case body is referred to as an air side 7. Obviously, in fig. 1, the air side 7 is the left side in the axial direction of the shaft member 8, and the oil side 6 is the oil side 6 in the axial direction of the shaft member 8. On the basis of which further description will be made below.

With continued reference to fig. 1, the retention apertures may include the following configurations: the portion of the holding hole close to the gas side 7 may be defined by a first holding surface 14, and the portion of the holding hole close to the oil side 6 may be defined by a second holding surface 15, and it is advantageous that both the first holding surface 14 and the second holding surface 15 are formed as cylindrical surfaces that are easy to machine, and it is particularly advantageous that the first holding surface 14 is fitted coaxially with the shaft member 8, which ensures that the oil seal 2 described below is held uniformly in the circumferential direction, thus ensuring the sealing effect of the oil seal 2 to a certain extent. On this basis, as mentioned in the foregoing description, the first holding surface 14 serves to hold the oil seal 2, and therefore, in order to facilitate giving the oil seal 2 a housing space, the first holding surface 14 has a larger diameter with respect to the second holding surface 15, which causes the third holding surface 16 to extend between the first holding surface 14 and the second holding surface 15.

The third holding surface 16 holds the oil seal 2 together with the first holding surface 14, that is, the first holding surface 14 and the third holding surface 16, and can be engaged (e.g., bonded or frictionally engaged) or abutted by portions of the oil seal 2, thereby ensuring that the state of the oil seal 2 itself is held when the shaft member 8 rotates. In the view given in fig. 1, the view is obtained with a plane through the axis of the shaft member 8 cutting the sealing mechanism, in this example the third retaining surface 16 is perpendicular to the axis of the shaft member 8, i.e. the third retaining surface 16 is formed as a substantially annular surface in this example, which is particularly advantageous for rapid machining of the retaining hole. In other examples, the third retaining surface 16 may also be formed in other forms, for example may be inclined towards the oil side 6 with reference to an edge located radially outside, which results in the third retaining surface 16 being formed as part of a conical surface. That is, the specific structure of the third holding surface 16 can be appropriately adjusted depending on the structure of the oil seal 2 to be mounted.

With further reference to fig. 1, the oil seal 2 is retained within the stepped configuration collectively defined by the first and third retaining surfaces 14, 16 in the manner described above. As a preferred embodiment, the oil seal 2 may be formed in an open structure, that is, the oil seal 2 may be formed in an annular structure as a whole, and at least one disconnected position is formed in the circumferential direction, and the portions of the oil seal 2 located on both sides of the disconnected position may be in a separated state before assembly, and may be screwed by using a fastener during assembly, so as to achieve engagement, which is particularly advantageous for assembly and disassembly, and particularly can be adapted to the occasion of periodic disassembly of the gearbox.

As a means for further improving the assembling and disassembling efficiency, the transparent cover 1 in the present embodiment may be further formed into a two-part structure, as shown in fig. 2, and fig. 2 schematically shows a view obtained when viewed in the axial direction of the shaft member 8. In the example of fig. 2, the transparent cover 1 is constructed in two upper and lower parts. Wherein, both sides of the upper partially transparent cover 17 in the horizontal direction may be formed with flange portions 19, the lower partially transparent cover 18 is formed with two flange portions 19 corresponding to the two flange portions 19 of the upper partially transparent cover 17, respectively, the upper partially transparent cover 17 and the lower partially transparent cover 18 may be fastened by bolts and nuts through the cooperation of the flange portions 19, and the advantages of such a connection will be explained in the following description.

Referring to fig. 1, an outer side portion of the main body portion 11 of the transparent cover 1 may be formed with a radially outer edge 13 extending toward the radially outer side, and a side portion of the main body portion 11 near the oil side 6 may be formed with an annular flange 12 extending toward the oil side 6, a portion of the annular flange 12 may be located at the side portion of the main body portion 11 near the oil side 6, and another portion of the annular flange 12 may be located at the side portion of the radially outer edge 13 near the oil side 6. The annular flange 12 can be inserted into a mounting hole of the gearbox casing, the outer edge of which can abut against the side of the radially outer edge 13 close to the oil side 6, so that the transparent cover 1 is mounted in the mounting hole. For the installation manner of the transparent cover 1, the split transparent cover 1 described above is particularly advantageous in that after the bolts and nuts are removed, the split transparent cover 1 is quickly released from the embedded state by using the split structure to complete the disassembly, or when the assembly is performed, the split transparent cover 1 is quickly used to complete the embedding and assembling process.

In the embodiment, on the basis of the split transparent cover 1, the sealing mechanism is further provided with a pressure plate 3. As shown in fig. 1, the platen 3 may be formed in a ring-shaped plate-like structure, i.e., a hole portion through which the shaft member 8 is inserted is formed. The pressure plate 3 may further be provided at a side portion of the transparent cover 1 close to the gas side 7, and a hole portion formed by the pressure plate 3 may have a smaller diameter with respect to the first holding surface 14, so that the pressure plate 3 shields most of the side portion of the oil seal 2 close to the gas side 7 with its side portion close to the oil side 6 to avoid a situation where foreign matter is accumulated at a contact portion of the side portion of the oil seal 2 close to the gas side 7 and the shaft member 8 to some extent.

The pressure plate 3 may be mounted to the transparent cover 1 with fasteners, for example with screws. Preferably, the pressure plate 3 is formed with a diameter that is the same as the diameter of the body portion 11 or slightly smaller than the diameter of the body portion 11, which facilitates reducing the radial space occupied by the body portion 11. Further, the pressing plate 3 can also be formed into a split structure similar to the transparent cover 1, that is, the pressing plate comprises an upper pressing plate 3 and a lower pressing plate 3, the upper part of the pressing plate 3 can be pre-installed on the upper part of the transparent cover 1, and the lower part of the pressing plate 3 can be pre-installed on the lower part of the transparent cover 1, so that when the transparent cover 1 is disassembled, the pressing plate 3 can be disassembled along the belt, the disassembling efficiency is particularly improved, and when the transparent cover 1 is assembled, the two pressing plates 3 can be mutually combined.

Still referring to fig. 1, in an embodiment, the sealing mechanism further comprises a sealing ring 4, which sealing ring 4 may for example be formed as a lip-type split sealing ring. The meaning of the open type is the same as that of the open type oil seal structure mentioned above, and the description is omitted here. Whereas the lip seal mentioned here comprises at least one sealing lip 5, for example in the example given in fig. 1, the seal 4 comprises one sealing lip 5, this sealing lip 5 can abut against the side of the pressure plate 3 close to the air side 7. In this way, the seal ring 4 and the shaft member 8 rotate together, and the seal lip 5 is a dynamic lip structure, and is engaged with the pressure plate 3, thereby further preventing the accumulation of foreign matters in the oil seal 2. Preferably, the side of the pressure plate 3 close to the air side 7 is formed with a flat annular surface for cooperation with the sealing lip 5. It is further advantageous that the annular surface is coaxial with the shaft member 8, thus ensuring that the same or substantially the same abutment is obtained for any position of the sealing lip 5 in cooperation with the annular surface, thereby ensuring that the sealing effect is uniform.

Further, the roughness of the annular surface may be configured to be ra0.4 to ra0.8, for example, preferably ra0.6, which is advantageous in improving the service life of the seal lip 5 while ensuring a reliable fit with the seal lip 5, because once the roughness of the annular surface is less than ra0.4, it results in a reduction in the sealing effect of the seal lip 5, while if the roughness is greater than ra0.8, it causes the seal lip 5 to wear out quickly, to be liable to fail, and also to wear out the annular surface easily. The hardness of the mating surface may be configured to be greater than or equal to HRC35, thus further avoiding annular surface losses. Preferably, the surfaces of the sides of the platen 3 adjacent the gas side 7 are each formed as a flat surface with the annular surface formed as part of the flat surface, so that the flat surface can be machined and heat treated to meet the aforementioned roughness and hardness requirements to reduce the difficulty of machining and heat treating only the annular surface.

In the embodiment, the main function of the seal ring 4 is to prevent dust, i.e., to prevent foreign matter such as external dust from accumulating at the oil seal 2, while as a preferred embodiment, the oil seal 2 may be constructed to have only a sealing structure that prevents leakage of lubricating oil from the oil side 6 to the air side 7, and the dust-proof structure is omitted because the function of dust-proof is already assumed by the seal ring 4. On one hand, compared with the oil seal 2 which has both a dustproof structure and an oil leakage prevention structure, for example, a double-framework oil seal with a plurality of lip structures, the oil seal 2 which only has the oil leakage prevention structure is relatively simple in structure, is easy to disassemble and assemble and still has a certain dustproof capacity; on the other hand, because the sealing ring 4 serving as a dustproof structure is matched with the oil seal having both a dustproof structure and an oil leakage prevention structure, dust and other impurities cannot be accumulated on the part, close to the air side 7, of the oil seal 2, and the dust and other impurities are accumulated at the abutting position of the lip of the seal lip 5 and the pressing plate 3, so that the oil seal is particularly favorable for cleaning and completing the disassembly quickly, and meanwhile, the oil seal 2 is ensured to be kept clean all the time in the disassembly and assembly process (which is particularly effective in improving the disassembly and assembly efficiency). In addition, under the condition that the axial space allows, the combination arrangement of the sealing ring 4 and the oil seal 2 is equivalent to the separation of the dustproof function from the oil seal 2, and the dustproof function and the oil sealing function are arranged from the air side 7 to the right side in a similar modularized mode, so that the dustproof function of the sealing ring 4 and the oil sealing function of the oil seal 2 are more favorably maximized compared with the oil seal which has both the dustproof structure and the oil leakage prevention structure.

In another embodiment of the sealing mechanism (not shown in the drawings) provided in this embodiment, the pressure plate is omitted, and in this embodiment, the first retaining surface has a smaller diameter than the second retaining surface, and the oil seal is retained by both the second retaining surface and the third retaining surface, i.e., the stepped structure defined by the second retaining surface and the third retaining surface is open to the oil side. In addition, in this embodiment, there is also a difference from the above embodiment in that the seal lip of the seal ring directly abuts against the side portion of the main body portion of the transparent cover close to the air side, that is, this side portion can meet the same requirement as the side portion of the above-mentioned pressure plate which is engaged with the seal lip. The embodiment is more suitable for occasions with limited axial space due to the omission of the pressing plate. The above-mentioned embodiment has the advantage that, since the surface cooperating with the sealing lip of the sealing ring needs to be subjected to the necessary heat treatment, the pressing plate facilitates the heat treatment process with respect to the entire transparent cover, while avoiding the occurrence of possible defective conditions of the transparent cover after the heat treatment. The press plates are also suitable for mass production, for example, relatively large-area plates can be heat-treated beforehand and then the press plates can be taken up according to the actual required dimensions.

The embodiment also provides a gearbox, which comprises the sealing mechanism, and the rest of the structure of the gearbox is mentioned above and is not described again. Further, the roughness of the surface of the shaft member 8 that fits the oil seal 2 may be configured to be ra0.4 to ra0.8 such as ra0.6, and the hardness is configured to be greater than or equal to HRC50, which configuration can also reduce the loss of the oil seal 2 and the shaft member 8 for reasons similar to those of the pressure plate 3, ensuring the life of the seal mechanism.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all changes that can be made in the details of the description and drawings, or directly/indirectly implemented in other related technical fields, are intended to be embraced therein without departing from the spirit of the present application.

Claims

1. A sealing mechanism is arranged on a device to be sealed, and the device to be sealed comprises:

an accommodating member formed with a mounting hole;

the sealing mechanism includes:

the first seal member is characterized in that at least one breaking position is formed in the circumferential direction, and portions of the first seal member located on both sides of the breaking position in the circumferential direction are detachably connected.

2. The seal mechanism according to claim 1, wherein the shield member includes at least two portions detachably connected in a radial direction of the shaft member.

3. The seal mechanism of claim 2, further comprising:

a second sealing member provided to the shaft member;

4. The seal mechanism of claim 3, wherein the shield member includes a body portion, the retaining hole being formed in the body portion, the retaining hole including:

5. The seal mechanism of claim 4,

the first retaining surface is formed with a larger diameter relative to the second retaining surface, the first seal member being retained by the first and third retaining surfaces;

6. The seal mechanism of claim 4,

the second retaining surface is formed with a larger diameter relative to the first retaining surface, the first seal member being retained by the second and third retaining surfaces;

7. The seal mechanism of claim 3,

the roughness of the mating surface is configured as Ra0.4 to Ra0.8, the hardness of the mating surface is configured to be greater than or equal to HRC 35;

8. The sealing mechanism of claim 4, wherein the shutter member further comprises:

9. A gearbox comprising a sealing mechanism as claimed in any one of claims 1 to 8, the device to be sealed being formed as the gearbox.

10. A gearbox according to claim 9,

the shaft member and the first seal member are fitted to each other, the roughness of the surface of the shaft member that is fitted to the first seal member is configured to be ra0.4 to ra0.8, and the hardness is configured to be greater than or equal to HRC 50.