Walking speed reducer with sealing structure and engineering machinery
By installing a solid seal assembly between the wheel hub of the walking reducer and injecting grease, the problem of floating oil seals being easily damaged in harsh environments is solved, achieving a longer service life and a lower failure rate.
Patent Information
- Application Number
- CN202422014502.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-20
AI Technical Summary
The floating oil seal of the walking reducer is susceptible to damage from soil, sand, mud and mud in harsh environments, resulting in seal failure and oil leakage.
A travel reducer with a sealing structure is designed, by installing a solid first sealing assembly between the hub and the output flange, and injecting grease into the sealing gap as the second sealing assembly, preventing external impurities from contacting the floating oil seal while providing a lubricating effect.
Effectively prevent impurities such as soil, sand, mud, water and mud from contacting the floating oil seal, extend the service life of the floating oil seal, and reduce the failure rate of the walking reducer.
Smart Images
Figure CN222992092U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a traveling speed reducer with a sealing structure, belonging to the technical field of traveling speed reducers. Background Art
[0002] The floating oil seal is an important sealing component of the traveling speed reducer. It is used between two relatively moving parts, namely the support shaft and the output flange, to seal the end face of the traveling speed reducer. As the driving device of a hydraulic excavator, the traveling speed reducer is located very close to the ground. The working environment of the traveling speed reducer has a large amount of soil, sand, and even works in muddy water or slurry. These substances will enter through the gaps of the relatively moving parts of the traveling speed reducer. Once they come into contact with the working surface of the floating oil seal, they will cause varying degrees of damage to the floating oil seal, resulting in the floating oil seal being unable to seal the oil and causing oil leakage in the traveling speed reducer. Summary of the Invention
[0003] In view of the deficiencies of the prior art, the utility model provides a traveling speed reducer with a sealing structure, which is beneficial to improving the working environment of the floating oil seal of the traveling speed reducer, preventing impurities such as soil, sand, muddy water, and slurry from contacting the floating oil seal, prolonging the service life of the floating oil seal, and can adapt to more severe working conditions.
[0004] The utility model is implemented according to the following technical solutions:
[0005] In a first aspect, the utility model provides a traveling speed reducer with a sealing structure, including:
[0006] A support shaft and an output flange that can rotate relative to each other;
[0007] A hub, which is installed on the outer circumferential surface of the connection between the support shaft and the output flange and is fixed to the support shaft;
[0008] A floating oil seal, which is installed on the inner circumferential surface of the connection between the support shaft and the output flange;
[0009] A first sealing assembly, which is in a solid state and is installed between the hub and the output flange to prevent external impurities from contacting the floating oil seal;
[0010] A second sealing assembly, which is in a liquid state and is injected from the hub and enters the sealing gap. On the one hand, it prevents external impurities from contacting the floating oil seal, and on the other hand, it lubricates the first sealing assembly and the floating oil seal.
[0011] In some embodiments, the first sealing assembly includes:
[0012] A radial rotary seal, which is arranged between the opposite radial circumferential surfaces of the hub and the output flange to play a role in radial sealing;
[0013] The axial rotary seal is arranged between the axial planes facing the hub and the output flange, and plays the role of axial sealing.
[0014] In some implementations, the wheel hub is provided with an O-shaped radial sealing groove, and the radial rotary seal is installed in the radial sealing groove; the wheel hub is provided with an O-shaped axial sealing groove, and the axial rotary seal is installed in the axial sealing groove.
[0015] In some implementations, the hub is provided with two O-shaped radial sealing grooves arranged side by side, and a radial rotating seal is installed in each radial sealing groove.
[0016] In some implementations, a grease hole is provided in the wheel hub, and the second sealing component is grease, and the grease enters the sealing gap from the grease hole to perform the functions of sealing and lubrication.
[0017] In some embodiments, the grease holes provided in the wheel hub are composed of radial grease holes and oblique grease holes connected thereto; the inlet of the radial grease hole is set as a threaded port for connecting an oil cup, and grease is applied through the oil cup, and the grease enters the sealing gap from the radial grease hole and the oblique grease hole.
[0018] In some implementations, a circle of grooves is provided on the inner circumferential surface of the hub at the outlet of the radial grease hole for storing grease.
[0019] In some implementations, a plurality of grease holes are provided in the wheel hub, and the plurality of grease holes are located on the same circumference and are evenly spaced.
[0020] In some embodiments, a plurality of through holes are provided at the outer edge of the axial surface of the support shaft along the entire circumferential interval; the wheel hub is provided with threaded holes corresponding to the plurality of through holes on the axial surface facing the support shaft, and the support shaft and the wheel hub are fixed together by a plurality of bolts.
[0021] In a second aspect, the utility model provides an engineering machine equipped with the above-mentioned travel reducer with a sealing structure.
[0022] Beneficial effects of the utility model:
[0023] After the utility model is implemented, by adding a wheel hub and three rotating sealing rings and filling the sealing gap with grease, impurities such as soil, sand, mud and mud are prevented from contacting the floating oil seal, thereby improving the working environment of the floating oil seal, extending the service life of the floating oil seal, and reducing the failure rate of the travel reducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.
[0025] In the accompanying drawings:
[0026] Figure 1 is the connection sectional view of the traveling speed reducer with a sealing structure of the present utility model;
[0027] Figure 2 is Figure 1 the enlarged view of part A in
[0028] Figure 3 is the exploded sectional view of the traveling speed reducer with a sealing structure of the present utility model;
[0029] Figure 4 is the schematic diagram of the distribution of the threaded holes and through holes of the support shaft of the present utility model;
[0030] Figure 5 is the schematic diagram of the structure of the hub of the present utility model (a is the overall sectional view, b is the side view, c is the enlarged view of part B);
[0031] Figure 6 is the schematic diagram of the sealing structure of the present utility model;
[0032] Figure 7 is the schematic diagram of the flow direction of the grease injection of the hub of the present utility model.
[0033] Reference numerals in the drawings: 1, support shaft; 2, floating oil seal; 3, hub; 4, radial rotary seal I; 5, radial rotary seal II; 6, axial rotary seal; 7, output flange; 8, gear ring; 9, oil cup; 10, bolt I; 11, bolt II; 101, through hole; 102, first threaded hole; 301, second threaded hole; 302, third threaded hole; 303, inclined grease injection hole; 304, radial grease injection hole; 305, first radial seal groove; 306, second radial seal groove; 307, axial seal groove.
[0034] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners
[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not intended to limit the scope of the present utility model.
[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0038] As Figure 1 、 Figure 3 shown, a walking speed reducer with a sealing structure includes a support shaft 1, an output flange 7, a floating oil seal 2, a hub 3, a gear ring 8, a first sealing component, and a second sealing component; the support shaft 1 and the output flange 7 can rotate relative to each other, and the gear ring 8 is fixedly connected to the output flange 7; the hub 3 is installed on the outer circumferential surface at the connection of the support shaft 1 and the output flange 7 and is fixed together with the support shaft 1; the floating oil seal 2 is installed on the inner circumferential surface at the connection of the support shaft 1 and the output flange 7; the first sealing component is in a solid state and is installed between the hub 3 and the output flange 7 to prevent external impurities from contacting the floating oil seal; the second sealing component is in a liquid state and is injected into the sealing gap from the hub 3. On the one hand, it prevents external impurities from contacting the floating oil seal 2, and on the other hand, it lubricates the first sealing component and the floating oil seal 2.
[0039] Installing the sealing structure on the walking speed reducer does not affect the basic functions of the walking speed reducer, and at the same time has the ability to prevent impurities such as soil, sand, mud, and slurry from contacting the floating oil seal 2, provides a better working environment for the floating oil seal 2, and extends the service life of the floating oil seal 2.
[0040] The following further describes the above-mentioned first sealing component.
[0041] As Figure 1 、 Figure 2 、Figure 3 As shown, the first sealing assembly includes a radial rotating seal and an axial rotating seal; the radial rotating seal is arranged between the radial circumferential surfaces of the hub 3 and the output flange 7, and plays a radial sealing role; the axial rotating seal is arranged between the axial planes of the hub 3 and the output flange 7, and plays an axial sealing role.
[0042] Further solutions, such as Figure 2 , Figure 5 , Figure 6 As shown, the wheel hub 3 is provided with an O-shaped radial sealing groove, and the radial rotary seal is installed in the radial sealing groove; the wheel hub 3 is provided with an O-shaped axial sealing groove 307, and the axial rotary seal 6 is installed in the axial sealing groove 307.
[0043] The preferred solution is Figure 2 , Figure 5 , Figure 6 As shown, the hub is provided with two O-shaped radial sealing grooves (i.e., a first radial sealing groove 305 and a second radial sealing groove 306) arranged side by side. A radial rotating seal I4 is installed in the first radial sealing groove 305, and a radial rotating seal II5 is installed in the second radial sealing groove 306.
[0044] It should be noted that the radial rotary seal I4 and the radial rotary seal II5 have the same selection specifications, and are respectively connected to the first radial sealing groove 305 and the second radial sealing groove 306 of the hub 3 to jointly play the role of radial sealing.
[0045] From the above, it can be seen that the wheel hub 3 is installed at the floating oil seal of the travel reducer, and three rotating seals are installed on the wheel hub 3, which can effectively prevent impurities such as soil, sand, mud and mud from contacting the floating oil seal 2, causing damage to the floating oil seal 2 and oil leakage.
[0046] The second sealing component mentioned above is further described below.
[0047] like Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, a grease hole is provided in the wheel hub 3, and the second sealing component is grease. The grease enters the sealing gap from the grease hole to perform the functions of sealing and lubrication.
[0048] According to a further solution, the grease holes provided in the wheel hub 3 are composed of a radial grease hole 304 and an oblique grease hole 303 connected thereto; the inlet of the radial grease hole 304 is set as a threaded port (i.e., the second threaded hole 301 in the figure) for connecting the oil cup 9, and grease is applied through the oil cup 9, and the grease enters the sealing gap from the radial grease hole 304 and the oblique grease hole 303.
[0049] Further solutions, such asFigure 5 , Figure 6 As shown in Figure 6 , a groove is provided on the circumferential surface of the inner ring of the hub 3 at the outlet of the radial grease hole 304 for storing grease.
[0050] For a further solution, as Figure 5 , Figure 6 shown, multiple grease holes are provided in the hub 3, and the multiple grease holes are located on the same circumference and are evenly spaced.
[0051] In a preferred solution, four grease holes are provided on the hub 3, spaced 90° apart on the same circumference, so that the greasing is more sufficient.
[0052] As can be seen from the above, the hub 3 is provided with a radial grease hole 304 and an inclined grease hole 303. Grease is injected through the grease holes to fill the sealing gap with grease, which can not only prevent impurities such as dirt, mud and slurry from contacting the floating oil seal 2, but also lubricate the rotary seal and the floating oil seal 2, and extend the service life of the seal.
[0053] The connection between the above-mentioned support seat and the output flange will be further described below.
[0054] As Figure 1 , Figure 3 , Figure 4 , Figure 5 shown, a plurality of through holes 101 and a plurality of first threaded holes 102 are provided at intervals along the entire circumference at the outer edge of the axial surface of the support shaft 1, and the through holes 101 and the first threaded holes 102 are arranged in an alternating manner; the hub 3 is provided with third threaded holes 302 corresponding to the plurality of through holes 101 on the axial surface facing the support shaft 1, and the support shaft 1 and the hub 3 are fixed together by a plurality of bolts I 10; the first threaded holes 102 cooperate with fasteners to fix the support shaft 1 on the vehicle and support the traveling speed reducer. The output flange 7 and the gear ring 8 are fixed together by a plurality of bolts II 11 to output power.
[0055] The following gives the assembly process of the sealing structure:
[0056] During the initial assembly, referring to Figure 5 and Figure 6 , the radial rotary seal I 4 is assembled into the first radial seal groove 305 of the hub 3, the radial rotary seal II 5 is assembled into the second radial seal groove 306 of the hub 3, the axial rotary seal 6 is assembled into the axial seal groove 307 of the hub 3, and the oil cup 9 is installed on the hub 3 through the second threaded hole 301.
[0057] Referring to Figure 1 and Figure 3, the bolt Ⅰ 10 passes through the through hole 101 and the third threaded hole 302 to connect the support shaft 1 and the hub 3; the support shaft 1, the floating oil seal 3 and the output flange 7 are connected through bearings and pressing devices; the output flange 7 and the gear ring 8 are connected through the bolt Ⅱ 11.
[0058] Reference Figure 5 , Figure 6 and Figure 7 , the grease is injected through the oil cup 9 and flows along the inclined grease adding hole 303 and the radial grease adding hole 304 to the sealing gap, playing a role in sealing and lubrication.
[0059] In summary, after the implementation of the present utility model, by adding the hub, three rotating sealing rings and filling the sealing gap with grease, it prevents impurities such as soil, sand, mud and slurry from contacting the floating oil seal, improves the working environment of the floating oil seal, extends the service life of the floating oil seal, and reduces the failure rate of the traveling speed reducer.
[0060] Next, the construction machinery provided by the present utility model will be described. The construction machinery described below can be correspondingly referred to the traveling speed reducer with a sealing structure described above.
[0061] A construction machinery provided by the present utility model may include the traveling speed reducer with a sealing structure as described in any one of the above embodiments.
[0062] The beneficial effects achieved by the construction machinery provided by the present utility model are consistent with those achieved by the traveling speed reducer with a sealing structure provided by the present utility model, so they will not be elaborated here.
[0063] It should be noted that the above construction machinery can be a crawler crane, a crawler excavator, a crawler pump truck or other crawler construction machinery.
[0064] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures and technologies are not shown in detail so as not to obscure the understanding of this specification.
[0065] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combinations of the features of different embodiments also mean being within the protection scope of the present utility model and form different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.
[0066] The above are only the preferred embodiments of the present utility model and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims
1. A travel reducer with a sealing structure, characterized in that: include: A supporting shaft and an output flange capable of relative rotation; A wheel hub is mounted on the outer peripheral surface of the connection between the support shaft and the output flange and is fixed to the support shaft; A floating oil seal is installed on the inner peripheral surface of the connection between the support shaft and the output flange; a first sealing assembly, which is solid and installed between the wheel hub and the output flange to prevent foreign matter from contacting the floating oil seal; the first sealing assembly includes a radial rotary seal and an axial rotary seal, the radial rotary seal is arranged between the radial circumferential surfaces facing the wheel hub and the output flange, and plays a radial sealing role; the axial rotary seal is arranged between the axial planes facing the wheel hub and the output flange, and plays an axial sealing role; The second sealing component is in liquid form and enters the sealing gap after being injected from the wheel hub. On the one hand, it prevents external impurities from contacting the floating oil seal, and on the other hand, it lubricates the first sealing component and the floating oil seal. A grease hole is provided in the wheel hub, and the second sealing component is grease. The grease enters the sealing gap from the grease hole to perform the functions of sealing and lubrication.
2. The travel reducer with a sealing structure according to claim 1, characterized in that: The wheel hub is provided with an O-shaped radial sealing groove, and the radial rotary seal is installed in the radial sealing groove; The wheel hub is provided with an O-shaped axial sealing groove, and the axial rotary seal is installed in the axial sealing groove.
3. The travel reducer with a sealing structure according to claim 2, characterized in that: The wheel hub is provided with two O-shaped radial sealing grooves arranged side by side, and a radial rotating seal is installed in each radial sealing groove.
4. The travel reducer with a sealing structure according to claim 1, characterized in that: The greasing holes provided in the wheel hub are composed of radial greasing holes and oblique greasing holes connected thereto; The inlet of the radial grease hole is set as a threaded port for connecting an oil cup. Grease is applied through the oil cup, and the grease enters the sealing gap from the radial grease hole and the oblique grease hole.
5. The travel reducer with a sealing structure according to claim 4, characterized in that: A circle of grooves is arranged on the inner circumferential surface of the hub at the outlet of the radial grease-adding hole for storing grease.
6. The travel reducer with a sealing structure according to claim 1, characterized in that: The wheel hub is provided with a plurality of greasing holes, which are located on the same circumference and are evenly spaced.
7. The travel reducer with a sealing structure according to claim 1, characterized in that: A plurality of through holes are provided at the outer edge of the axial surface of the support shaft along the entire circumferential interval; the wheel hub is provided with threaded holes corresponding to the plurality of through holes on the axial surface facing the support shaft, and the support shaft and the wheel hub are fixed together by a plurality of bolts.
8. An engineering machine, characterized in that: A travel reducer with a sealing structure as described in any one of claims 1 to 7 is installed.