Repair balance shaft
By processing the annular groove on the balance shaft roller surface and cladding the toughness and high-strength cladding layer, the serious wear problem is solved, and the wear resistance is improved and resource saving is achieved.
Patent Information
- Application Number
- CN202422486039.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the prior art, the roller surface of the walking chassis balance shaft is severely worn under heavy load conditions, resulting in rapid wear and reaching the limit, unable to continue to use, resulting in waste of resources.
The annular groove is processed on the balance shaft roller surface, and the tough cladding layer and high-strength cladding layer are clad in the groove. The additive cladding process is used to form a new roll surface with excellent wear resistance, avoiding the depth unevenness and cracking of the original heat treatment layer.
It extends the service life of the balance shaft, reduces resource waste and costs, and achieves improvement in the wear resistance of the roller surface.
Smart Images
Figure CN223164862U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vehicle part processing, and particularly relates to a repaired balance shaft. Background Art
[0002] The roller surface of the balance shaft of the walking chassis is in direct contact with the bearing needle rollers. During normal driving, due to the heavy weight of the vehicle body itself, about 60 tons, there will be a relatively serious wear and material reduction of the needle rollers on the roller surface of the balance shaft. Generally, when the overhaul cycle reaches about 6000 kilometers, the contact surface between the needle rollers and the roller surface of the balance shaft will be worn to the limit. After exceeding this limit, the driving wheel hub will become unstable. The material of this type of balance shaft is 45CrNi. The original treatment process for the roller surface of the balance shaft is to adopt a heat treatment process to increase the hardness of the contact surface of the needle rollers to about ≥58HRC, and the thickness of the hardened layer is about 1.2 mm. However, this heat treatment process is prone to enter the fatigue state by changing the metal microstructure of the working surface, resulting in rapid wear of the roller surface under the high-temperature environment generated by the continuous friction of the needle rollers. Once the wear reaches the limit, the original treatment method is to scrap and replace with new parts, causing relatively large waste. Content of the Utility Model
[0003] The utility model provides a repaired balance shaft, aiming to solve the technical problems proposed in the above background art.
[0004] To achieve the above object, the technical solution adopted by the utility model is: providing a repaired balance shaft, including:
[0005] A shaft body, provided with a roller surface and a ball groove, an annular groove is opened on the roller surface, and the end of the annular groove is spaced from the ball groove on the shaft body;
[0006] A ductile cladding layer, arranged in the annular groove and connected to the shaft body; and
[0007] A high-strength cladding layer, arranged in the annular groove and located outside the ductile cladding layer, connected to the ductile cladding layer, and the high-strength cladding layer is flush with the roller surface of the shaft body.
[0008] In a possible implementation manner of the repaired balance shaft provided by the utility model, both ends of the annular groove are provided with bevels, and the bevel angle of the bevel is 30° - 45°.
[0009] In a possible implementation manner of the repaired balance shaft provided by the utility model, the surface of the annular groove is provided with a passivation layer.
[0010] In a possible implementation manner of the repaired balance shaft provided by the utility model, the shaft body is axially provided with two roller surfaces, and the ball groove is arranged between the two roller surfaces.
[0011] In a possible implementation of the repaired balance shaft provided by the present utility model, the thickness of the ductile cladding layer is 0.7 - 1.0 mm.
[0012] In a possible implementation of the repaired balance shaft provided by the present utility model, the thickness of the high-strength cladding layer is 0.8 - 1.2 mm.
[0013] In a possible implementation of the repaired balance shaft provided by the present utility model, the ductility of the ductile cladding layer is greater than that of the high-strength cladding layer, and the strength of the high-strength cladding layer is greater than that of the ductile cladding layer.
[0014] In a possible implementation of the repaired balance shaft provided by the present utility model, it further includes a plurality of cemented carbide blocks. A plurality of embedding grooves are provided in the annular groove, and the embedding grooves correspond to the cemented carbide blocks one by one. The cemented carbide blocks are embedded in the embedding grooves, and the upper surface of the cemented carbide blocks is higher than the ductile cladding layer, lower than the high-strength cladding layer or flush with the high-strength cladding layer.
[0015] The beneficial effects of the repaired balance shaft provided by the present utility model are as follows: Compared with the prior art, for the repaired balance shaft provided by the present utility model, an annular groove is machined on the roller surface of the balance shaft to remove the severely worn original heat treatment layer, and then an additive cladding process is used to clad a ductile cladding layer in the annular groove, and then a high-strength cladding layer is clad on the ductile cladding layer. The ductile cladding layer can effectively prevent the uneven depth of the original heat treatment layer and the residual high-hardness points, resulting in cracking; the high-strength cladding layer is used to provide sufficient wear resistance. As the new roller surface, the balance shaft can be put back into use without directly scrapping the balance shaft, which can greatly save resources and costs. Description of the Drawings
[0016] Figure 1 It is a three-dimensional structural schematic diagram of the repaired balance shaft provided by Embodiment 1 of the present utility model;
[0017] Figure 2 It is a front view structural schematic diagram of the repaired balance shaft provided by Embodiment 1 of the present utility model;
[0018] Figure 3 It is along Figure 2 The sectional view taken along line A - A in
[0019] Figure 4 It is a three-dimensional structural schematic diagram of the repaired balance shaft provided by Embodiment 2 of the present utility model;
[0020] Figure 5 It is a front view structural schematic diagram of the repaired balance shaft provided by Embodiment 2 of the present utility model;
[0021] Figure 6 is a sectional view along the Figure 5 section line B-B in
[0022] Description of reference numerals:
[0023] 10. Shaft body; 11. Ball groove; 20. Tough cladding layer;
[0024] 30. High-strength cladding layer; 40. Cemented carbide block; Detailed implementation manners
[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more obvious, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0027] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0028] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it will not be further discussed in subsequent drawings.
[0029] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.
[0030] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, and corresponding interpretations should be made for the spatial relative descriptions used here.
[0031] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present application.
[0032] Please refer to Figures 1 to 6, a description of the repaired balance shaft provided by the present utility model will now be given. The repaired balance shaft includes a shaft body 10, a ductile cladding layer 20, and a high-strength cladding layer 30. The shaft body 10 is provided with a roller surface and a ball groove 11. An annular groove is formed on the roller surface, and the end of the annular groove is spaced from the ball groove 11 on the shaft body 10; the ductile cladding layer 20 is arranged in the annular groove and is connected to the shaft body 10; the high-strength cladding layer 30 is arranged in the annular groove and is located outside the ductile cladding layer 20 and is connected to the ductile cladding layer 20. The high-strength cladding layer 30 is flush with the roller surface of the shaft body 10.
[0033] Specifically, the ductile cladding layer 20 has a low hardness (20-25HRC) and high toughness, and can effectively cover the remaining high-hardness points in the annular groove to avoid cracking; the high-strength cladding layer 30 has a high hardness (≥58HRC) and can effectively ensure the wear resistance.
[0034] The beneficial effect of the repaired balance shaft provided by the present utility model is that: compared with the prior art, for the repaired balance shaft provided by the present utility model, an annular groove is machined on the roller surface of the balance shaft to remove the severely worn original heat treatment layer, and then an additive cladding process is used to clad a ductile cladding layer 20 in the annular groove, and then a high-strength cladding layer 30 is clad on the ductile cladding layer 20. The ductile cladding layer 20 can effectively prevent the uneven depth of the original heat treatment layer and the remaining high-hardness points from causing cracking; the high-strength cladding layer 30 is used to provide sufficient wear resistance. As the new roller surface, the balance shaft can be put back into use without directly scrapping the balance shaft, which can greatly save resources and costs.
[0035] Such as Figure 2 and Figure 3 As shown, in a specific implementation manner of the repaired balance shaft provided by the embodiment of the present utility model, chamfers are formed at both ends of the annular groove, and the chamfer angle is 30° to 45°, which is convenient for the subsequent cladding process.
[0036] In a specific implementation manner of the repaired balance shaft provided by the embodiment of the present utility model, a passivation layer is provided on the surface of the annular groove.
[0037] Specifically, the pulse laser cleaning technology with a power of 300 watts is used to perform pulse bombardment passivation on the surface of the annular groove on the roller surface of the balance shaft to reduce the surface finish and the reflectivity during laser cladding.
[0038] Such as Figure 1 and Figure 2 As shown, in a specific implementation manner of the repaired balance shaft provided by the embodiment of the present utility model, the shaft body 10 is provided with two roller surfaces along the axial direction, and the ball groove 11 is arranged between the two roller surfaces.
[0039] Specifically, such as Figure 3As shown, in a specific embodiment of the repaired balance shaft provided by the embodiment of the present invention, the thickness of the toughness cladding layer 20 is 0.7 to 1.0 mm.
[0040] Preferably, the thickness of the toughness cladding layer 20 is 1.0 mm.
[0041] As Figure 3 shown, in a specific embodiment of the repaired balance shaft provided by the embodiment of the present invention, the thickness of the high-strength cladding layer 30 is 0.8 to 1.2 mm.
[0042] Preferably, the thickness of the high-strength cladding layer 30 is 1.2 mm.
[0043] In a specific embodiment of the repaired balance shaft provided by the embodiment of the present invention, the toughness of the toughness cladding layer 20 is greater than that of the high-strength cladding layer 30, and the strength of the high-strength cladding layer 30 is greater than that of the toughness cladding layer 20.
[0044] As Figures 4 to 6 shown, in a specific embodiment of the repaired balance shaft provided by the embodiment of the present invention, it further includes a plurality of cemented carbide blocks 40. A plurality of embedding grooves are provided in the annular groove, and the embedding grooves correspond to the cemented carbide blocks 40 one by one. The cemented carbide blocks 40 are embedded in the embedding grooves, and the upper surface of the cemented carbide blocks 40 is higher than the toughness cladding layer 20 and lower than or flush with the high-strength cladding layer 30.
[0045] Specifically, the hardness of the cemented carbide blocks 40 is greater than that of the high-strength cladding layer 30, which is used to further improve the wear resistance of the roll surface and extend its service life. A plurality of rows of cemented carbide blocks 40 are provided along the circumferential direction of the annular groove, and the plurality of rows of cemented carbide blocks 40 are arranged staggeredly.
[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A repaired balance shaft, characterized in that, Comprising: A shaft body, provided with a roller surface and a ball groove, an annular groove is opened on the roller surface, and the end of the annular groove is spaced from the ball groove on the shaft body; A ductile cladding layer, arranged in the annular groove and connected to the shaft body; A high-strength cladding layer, arranged in the annular groove and located outside the ductile cladding layer, connected to the ductile cladding layer, and the high-strength cladding layer is flush with the roller surface of the shaft body.
2. The repaired balance shaft according to claim 1, characterized in that, Both ends of the annular groove are provided with bevels, and the bevel angle of the bevel is 30° to 45°.
3. The repaired balance shaft according to claim 1, wherein, A passivation layer is provided on the surface of the annular groove.
4. The repaired balance shaft according to claim 1, wherein, Two roller surfaces are axially arranged on the shaft body, and the ball groove is arranged between the two roller surfaces.
5. The repaired balance shaft according to claim 1, characterized in that, The thickness of the ductile cladding layer is 0.7 to 1.0 mm.
6. The repaired balance shaft according to claim 5, wherein, The thickness of the high-strength cladding layer is 0.8 to 1.2 mm.
7. The repaired balance shaft according to claim 1, wherein, The ductility of the ductile cladding layer is greater than that of the high-strength cladding layer, and the strength of the high-strength cladding layer is greater than that of the ductile cladding layer.
8. The repaired balance shaft according to any one of claims 1-7, characterized in that, It further includes a plurality of cemented carbide blocks. A plurality of embedding grooves are opened in the annular groove. The embedding grooves correspond to the cemented carbide blocks one by one. The cemented carbide blocks are embedded in the embedding grooves, and the upper surface of the cemented carbide blocks is higher than the ductile cladding layer, lower than the high-strength cladding layer or flush with the high-strength cladding layer.