Sealing structure of input shaft of reduction gearbox and reduction gearbox
By setting a spacer sleeve on the outer circumference of the gearbox input shaft and designing an oil drain hole on the end cover, the problem of easy leakage in the sealing structure is solved, the durability and reliability of the seal are improved, and the maintenance difficulty and cost are reduced.
Patent Information
- Application Number
- CN202423240993.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The service life of the sealing structure at the input shaft of the gearbox of the emulsion pump is not optimistic. Gear oil leakage is prone to occur at the seal, and the labor intensity is high when replacing the rotary seal.
A spacer sleeve is installed on the outer periphery of the input shaft of the gearbox. The seal contacts the spacer sleeve instead of directly contacting the input shaft. Oil drain holes are designed on the end cover and the housing to facilitate gear oil return and prevent leakage.
Extend the service life of seals, reduce maintenance costs, improve sealing reliability, prevent gear oil leakage, and simplify the maintenance process.
Smart Images
Figure CN223578788U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a sealing structure technical field especially is related to a sealing structure and reduction gearbox of input shaft of reduction gearbox. BACKGROUND
[0002] With the continuous development of coal mine equipment, the service life and maintainability of the emulsion pump parts in the coal mine are increasingly required. At present, the service life of the sealing structure at the input shaft of the reduction gearbox of the emulsion pump is not optimistic, gear oil leakage is prone to occur at the sealing part, and the replacement of the rotary seal is relatively cumbersome, and the labor intensity of the maintenance personnel is large. INVENTION CONTENTS
[0003] The utility model aims at least solves the technical problem that the service life of the sealing structure at the input shaft of the reduction gearbox of the emulsion pump in prior art is not optimistic, gear oil leakage is prone to occur at the sealing part.
[0004] Therefore, one purpose of the utility model is to provide a sealing structure of input shaft of reduction gearbox, the sealing structure of input shaft of reduction gearbox includes interval sleeve that sets up at the outer periphery of the input shaft of reduction gearbox, interval sleeve and the end cover of reduction gearbox form installation space between, the installation space is provided with sealing element, the oil drain hole that the installation space and the inside of the box are communicated is provided on the box body of reduction gearbox.
[0005] In some embodiments, the end cover is provided with a notch to communicate the oil drain hole and the installation space.
[0006] In some embodiments, the outer periphery of the input shaft is provided with a bearing, and the end cover, the bearing and the input shaft form an oil collecting cavity.
[0007] In some embodiments, the interval sleeve is interference fit with the input shaft.
[0008] In some embodiments, one end of the interval sleeve has a positioning portion, and the outer periphery of the input shaft is provided with an arc portion matched with the positioning portion.
[0009] In some embodiments, the sealing element is spaced apart along the axial direction of the input shaft.
[0010] In some embodiments, the sealing element is a skeleton seal.
[0011] In some embodiments, the inner side of the end cover and / or the outer periphery of the interval sleeve is provided with a limiting protrusion.
[0012] In some embodiments, the other end of the interval sleeve is spaced apart and provided with a plurality of openings to cooperate with the dismounting tool.
[0013] In some embodiments, the input shaft includes a body portion and a shoulder portion, the spacer sleeve is arranged on the shoulder portion, and a diameter of the shoulder portion is greater than a diameter of the body portion.
[0014] Another object of the present application is to provide a reduction gearbox, comprising the sealing structure of the input shaft of the reduction gearbox.
[0015] The sealing structure of the input shaft of the reduction gearbox and the reduction gearbox provided by the present application have the following beneficial effects:
[0016] The sealing structure of the input shaft of the reduction gearbox provided by the present application sets the spacer sleeve between the input shaft and the end cover and sets the sealing member on the outer periphery of the spacer sleeve, so that the sealing member directly contacts the spacer sleeve instead of directly contacting the input shaft. In the long-term operation process, the sealing member only causes a certain abrasion to the outer surface of the spacer sleeve. The spacer sleeve only needs to be replaced within a specified time, thereby avoiding the case that the input shaft is replaced as a whole due to abrasion of the mating surface of the input shaft and the end cover.
[0017] The sealing structure of the input shaft of the reduction gearbox provided by the present application is designed with a notch, and the part corresponding to the box body is designed with a oil drain hole, so that the gear oil in the sealing member can flow back to the inside of the box body in time, thereby avoiding the leakage risk caused by a large amount of gear oil accumulated in the sealing member and the installation space of the sealing member, improving the durability of the sealing member, and improving the sealing reliability. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0019] Figure 1 is a use state schematic diagram of the sealing structure of the input shaft of the reduction gearbox in the embodiment of the present application;
[0020] Figure 2 is a partial front view of Figure 1 in the embodiment of the present application;
[0021] Figure 3 is a perspective view of the spacer sleeve in the embodiment of the present application.
[0022] Reference signs:
[0023] 1, spacer sleeve; 11, notch; 2, sealing element; 3, mounting space; 4, limiting protrusion; 5, oil collecting cavity; 6, oil discharging hole; 7, check ring; 100, box body; 200, input shaft; 201, main body part; 202, shaft shoulder part; 203, circular arc part; 300, end cover; 301, notch; 400, bearing. DETAILED DESCRIPTION
[0024] Various aspects and features of the present application are described herein below with reference to the accompanying drawings.
[0025] It is to be understood that various alterations and modifications can be made to the embodiments described herein. Thus, the above description should not be taken as limiting the present application but is made merely for the purposes of illustration and working of embodiments.
[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.
[0027] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example only, with reference to the attached drawings.
[0028] It is also to be understood that even though a number of embodiments of the present application have been described herein, many modifications and variations thereto are possible, as will be appreciated by those skilled in the art. The equivalent of all such modifications and variations are within the scope of the present application, as expressed in the appended claims.
[0029] The above and other aspects, features, and advantages of the present application will become apparent from the following description of preferred forms given by way of non-limiting example only with reference to the accompanying drawings.
[0030] Specific embodiments of the present application are described herein below, with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely those examples of the present application and can be carried out in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that can obscure the present application. Therefore, the specific structural and functional details disclosed herein are not intended to limit, but merely as a basis for the patent claims and a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriate detailed structure.
[0031] The first embodiment of this utility model provides a sealing structure for the input shaft of a gearbox. The gearbox includes a housing, an input shaft, and an end cover fixed to the end of the housing. One end of the input shaft is disposed inside the housing, and the other end extends out of the end cover. A bearing is installed on the outer periphery of the input shaft. The input shaft is mounted on the housing through the bearing to ensure that the input shaft can rotate inside the housing.
[0032] The first embodiment of this utility model provides a sealing structure for the input shaft of a gearbox, such as... Figure 1 As shown, the gearbox includes a housing 100, an input shaft 200, and an end cover 300 fixed to the end of the housing 100. One end of the input shaft 200 is located inside the housing 100, and the other end extends out of the end cover 300. A bearing 400 is installed on the outer periphery of the input shaft 200. The input shaft 200 is mounted on the housing 100 by the bearing 400 to ensure that the input shaft 200 can rotate inside the housing 100.
[0033] like Figures 1-3 As shown, the sealing structure of the gearbox input shaft includes a spacer sleeve 1 and a seal 2. Specifically, the spacer sleeve 1 is disposed on the outer periphery of the input shaft 200, forming an installation space 3 between the spacer sleeve 1 and the end cover 300, and the seal 2 is disposed within the installation space 3. The seal 2 ensures the sealing performance between the input shaft 200 and the end cover 300, preventing oil inside the gearbox 100 from flowing out of the gearbox 100 through the gap between the end cover 300 and the spacer sleeve 1. The spacer sleeve 1 between the input shaft 200 and the gearbox 100 prevents direct contact between the input shaft 200 and the end cover 300, reducing friction between the input shaft 200 and the seal 2 during rotation and thus preventing damage to the input shaft 200. In this design, the spacer sleeve 1 can be removed when it is severely worn, eliminating the need to replace the input shaft 200, thus extending the gearbox's service life and reducing maintenance workload.
[0034] Furthermore, multiple seals 2 are spaced apart along the axial direction of the input shaft 200 to improve the sealing performance between the input shaft 200 and the end cover 300. For example, two seals 2 are provided. Here, the seal 2 is a skeleton seal 2, which, by utilizing its good sealing performance and wear resistance, helps to extend its service life. Alternatively, the seal 2 can also be selected as an O-ring or other type of seal 2.
[0035] Furthermore, a radially extending limiting protrusion 4 is provided on the inner side of the end cap 300 and the outer periphery of at least one of the spacer sleeves 1, providing positioning for the installation of the seal 2 and improving the assembly accuracy of the seal 2. The limiting protrusion 4 is located on the side near the bearing 400, and a retaining ring 7 is also provided on the outer periphery of the spacer sleeve 1. The limiting protrusion 4 and the retaining ring 7 cooperate to restrict the axial movement of the seal 2 on the input shaft 200.
[0036] The input shaft 200 herein comprises a main body part 201 and a shaft shoulder part 202, the main body part 201 herein refers to the part extending out of the case body 100, the shaft shoulder part 202 herein refers to the part arranged in the end cover 300, wherein the spacer sleeve 1 is arranged on the shaft shoulder part 202, the diameter of the shaft shoulder part 202 is larger than that of the main body part 201, arranging the spacer sleeve 1 on the shaft shoulder part 202 with larger diameter can provide sufficient structural strength for the spacer sleeve 1.
[0037] Further, the spacer sleeve 1 is in interference fit with the input shaft 200. By means of the interference fit, the use of fasteners such as screws can be reduced, the number of parts is reduced, compared with threaded connection, the risk of thread disengagement is avoided, the connection strength between the spacer sleeve 1 and the shaft shoulder part 202 is ensured, and the connection reliability is improved.
[0038] Further, as shown in Figure 3 , one end of the spacer sleeve 1 has a positioning part, and the outer periphery of the input shaft 200 is provided with an arc part 203 matched with the positioning part. The positioning part herein refers to the end part of the spacer sleeve 1, and the arc part 203 is arranged at the connection position between the shaft shoulder part 202 and the other shaft part of the input shaft 200. The spacer sleeve 1 and the input shaft 200 are matched by the positioning part and the arc part 203, the contact area between them is small, which can avoid stress concentration between one end of the spacer sleeve 1 and the input shaft 200, and ensure the strength, stability and durability of the spacer sleeve 1 and the input shaft 200.
[0039] Further, as shown in Figure 3 , the other end of the spacer sleeve 1 is provided with a plurality of openings 11 arranged at intervals to cooperate with the dismounting tool. The dismounting tool cooperates with the openings 11 to dismount the spacer sleeve 1, which is convenient and fast, and is less likely to cause secondary damage to the outer surface of the spacer sleeve 1.
[0040] Further, as shown in Figure 1 and Figure 2 , the end cover 300, the bearing 400 and the input shaft 200 form an oil collecting cavity 5, and the case body 100 of the reduction gearbox is provided with a drain hole 6 communicating the mounting space 3 and the inside of the case body 100. Specifically, the end cover 300 is provided with a notch 301 to communicate the drain hole 6 and the mounting space 3. The drain hole 6 is arranged obliquely on the case body 100 and communicates with the inside of the case body 100, and the two ends of the drain hole 6 communicate with the oil collecting cavity 5 and the inside of the case body 100 respectively, which can make the gear oil in the mounting space 3 of the sealing member 2 flow back to the inside of the case body 100 in time, avoid the risk of leakage caused by large accumulation of gear oil in the skeleton seal, and further improve the durability of the skeleton seal.
[0041] The installation and use process of the utility model: first, the interval sleeve 1 is assembled to the input shaft 200 in the interference fit mode, and then cooperates with the sealing element 2. Secondly, the input shaft 200 is fixed on the box body 100 through the bearing 400. Finally, the end cover 300 is installed to the box body 100 through the bolt.
[0042] The interval sleeve 1 structure having the buffering effect is arranged between the sealing element 2 and the input shaft 200, so that the sealing element 2 directly contacts the surface of the input shaft 200 is avoided. When the input shaft 200 operates, the interval sleeve 1 is driven to rotate together with the input shaft 200, and the outer surface of the interval sleeve 1 cooperates with the sealing surface of the skeleton sealing element 2. Since the sealing surface of the skeleton sealing element 2 directly contacts the interval sleeve 1 instead of the related cooperating surface of the input shaft 200, in the long-term operation process, the skeleton sealing element 2 only causes a certain abrasion to the outer surface of the interval sleeve 1, so that the interval sleeve 1 only needs to be replaced within a specified time, and the situation that the input shaft 200 is replaced as a whole due to the abrasion of the cooperating surface of the input shaft 200 is avoided. The maintainability is improved, and the maintenance cost is reduced.
[0043] Further, when the interval sleeve 1 is disassembled, the special disassembly tool is used to hook the rear end aperture 11, and then the interval sleeve 1 is pulled out from the input shaft 200.
[0044] The second embodiment of the utility model provides a reduction gearbox, which comprises the sealing structure of the input shaft of the reduction gearbox.
[0045] In the embodiment, the sealing structure of the input shaft of the reduction gearbox is provided with the interval sleeve 1 between the input shaft 200 and the end cover 300, and the sealing element 2 is arranged on the outer periphery of the interval sleeve 1. The sealing element 2 directly contacts the interval sleeve 1 instead of directly contacting the input shaft 200. In the long-term operation process, the sealing element 2 only causes a certain abrasion to the outer surface of the interval sleeve 1, so that the interval sleeve 1 only needs to be replaced within a specified time, and the situation that the input shaft 200 is replaced as a whole due to the abrasion of the cooperating surface of the input shaft 200 and the end cover 300 is avoided.
[0046] In the embodiment, the end cover 300 of the sealing structure of the input shaft of the reduction gearbox is designed with the notch 301, and the part corresponding to the notch 301 of the box body 100 is designed with the oil drain hole 6. The gear oil in the sealing element 2 can flow back to the inside of the box body 100 in time, the risk of leakage caused by the large accumulation of the gear oil in the sealing element 2 and the installation space 3 of the sealing element 2 is avoided, the durability of the sealing element 2 is improved, and the sealing reliability is improved.
[0047] In the description of the utility model, it is understood that the orientation or positional relationship indicated by 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 is the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does 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 cannot be understood as a limitation on the utility model.
[0048] In the description of the utility model, "first feature", "second feature" can include one or more features.
[0049] In the description of the utility model, "multiple" means two or more.
[0050] In the description of the utility model, "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.
[0051] In the description of the utility model, "above", "above" and "above" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.
[0052] In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0053] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.
Claims
1. A sealing structure for the input shaft of a gearbox, characterized in that, The gearbox includes a spacer sleeve disposed on the outer periphery of the input shaft, an installation space is formed between the spacer sleeve and the end cover of the gearbox, a seal is disposed in the installation space, and an oil drain hole is disposed on the gearbox housing that connects the installation space and the interior of the housing.
2. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, The end cap is provided with a notch to connect the oil discharge hole and the installation space.
3. The sealing structure for the input shaft of the gearbox according to claim 2, characterized in that, A bearing is provided on the outer periphery of the input shaft, and the end cover, the bearing and the input shaft form an oil collection cavity.
4. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, The spacer sleeve is interference-fitted with the input shaft.
5. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, One end of the spacer sleeve has a positioning part, and the outer periphery of the input shaft is provided with an arc part that cooperates with the positioning part.
6. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, The seals are provided in multiple portions spaced apart along the axial direction of the input shaft; and / or The sealing element is a skeleton sealing element.
7. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, Limiting protrusions are provided on the inner side of the end cap and / or the outer periphery of the spacer sleeve.
8. The sealing structure for the input shaft of the gearbox according to claim 5, characterized in that, The other end of the spacer sleeve is provided with multiple notches at intervals to cooperate with the disassembly tooling.
9. The sealing structure for the input shaft of the gearbox according to claim 1, characterized in that, The input shaft includes a main body and a shoulder, and the spacer sleeve is disposed on the shoulder, the diameter of which is larger than the diameter of the main body.
10. A gearbox, characterized in that, The sealing structure includes the gearbox input shaft as described in any one of claims 1-9.