Wear-resistant and corrosion-resistant sealing surface structure applied to transmission shaft or transmission shaft flange

Abstract

The utility model discloses a wear-resistant and corrosion-resistant sealing surface structure applied to a transmission shaft or a transmission shaft flange, which comprises a shaft body, a metal sealing layer is processed in an area on the shaft body, the area is used for being sleeved with a sealing ring, and a protective layer is coated on the metal sealing layer. According to the wear-resistant and corrosion-resistant sealing element structure, the wear-resistant and corrosion-resistant problems of different types of transmission shaft sealing surfaces are solved, the consumption of high-performance precious base materials can be effectively reduced, the machining process is flexible, the wear-resistant and corrosion-resistant sealing element structure can be realized through an economical and environment-friendly technology, and the product cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of transmission shaft sealing structure, and in particular to a wear-resistant and corrosion-resistant sealing surface structure applied to transmission shafts or transmission shaft flanges. Background Technology

[0002] Input and output transmission shafts used for torque transmission in mechanical and automotive structures are mounted on the gearbox housing, with their two ends exposed to different environmental media. A sealing structure is typically used where a sealing ring rotates relative to the transmission shaft, requiring good wear resistance in the mating structure. For the portion of the transmission shaft exposed to a corrosive environment, corrosion may occur. For example, the end of the transmission shaft in an automotive transmission exposed to the atmosphere will be affected by environmental factors and corrode, gradually extending to the sealing area with use, causing damage to the transmission shaft and leading to lubricant leakage. This is the cause of oil leaks in many transmissions. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model proposes a wear-resistant and corrosion-resistant sealing surface structure for transmission shafts. This wear-resistant and corrosion-resistant sealing structure solves the problem of wear and corrosion resistance for sealing surfaces of different types of transmission shafts, effectively reduces the consumption of high-performance and expensive base materials, offers flexible processing technology, and can be achieved through economical and environmentally friendly technologies, thereby reducing product costs.

[0004] A wear-resistant and corrosion-resistant sealing surface structure for use on a transmission shaft or transmission shaft flange includes a shaft body, wherein a metal sealing layer is machined on the area of ​​the shaft body for fitting a sealing ring, and a protective layer is coated on the metal sealing layer.

[0005] As a preferred embodiment of the above technical solution, the metal sealing layer is processed onto the shaft body using laser cladding or thermal spraying.

[0006] As a preferred embodiment of the above technical solution, the metal sealing layer is made of an alloy material.

[0007] As a preferred embodiment of the above technical solution, the material used to prepare the metal sealing layer is either an iron-based alloy or a nickel-based alloy.

[0008] As a preferred embodiment of the above technical solution, the thickness of the metal sealing layer is not less than 0.2 mm.

[0009] As a preferred embodiment of the above technical solution, the protective layer is disposed on the outer exposed area of ​​the shaft body and the surface of the adjacent part of the metal sealing layer.

[0010] As a preferred embodiment of the above technical solution, the protective layer is made of anti-corrosion paint.

[0011] As a preferred embodiment of the above technical solution, the hardness of the metal sealing layer is 450-650HV.

[0012] The beneficial effects of this utility model are as follows:

[0013] The wear-resistant and corrosion-resistant sealing surface structure for transmission shafts provided by this utility model, due to the use of locally wear-resistant and corrosion-resistant alloy materials, allows for a wider range of selection of base materials, maximizing their load-bearing capacity. The use of locally wear-resistant and corrosion-resistant alloy materials reduces the consumption of high-performance and expensive base materials. The processing technology is flexible, and the product cost is reduced through economical and environmentally friendly technology, thus solving the problem of wear resistance and corrosion protection for sealing surfaces of different types of transmission shafts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the transmission shaft used in a wear-resistant and corrosion-resistant sealing surface structure.

[0015] Figure 2 This is a schematic diagram of the structure of a transmission shaft flange used in a wear-resistant and corrosion-resistant sealing surface structure.

[0016] Figure 3 This is a schematic diagram of a mechanism where the base of the transmission shaft is in a rough machining state.

[0017] Figure 4 This is a schematic diagram of a mechanism where the transmission shaft flange base is in a rough machining state.

[0018] Figure 5 This is a schematic diagram of one embodiment of a transmission shaft that utilizes a wear-resistant and corrosion-resistant sealing surface structure.

[0019] Figure 6 This is a schematic diagram of one embodiment of a transmission shaft flange that utilizes a wear-resistant and corrosion-resistant sealing surface structure. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0021] Figure 1 This is a schematic diagram of the transmission shaft that utilizes this wear-resistant and corrosion-resistant sealing surface structure.

[0022] Figure 2 This is a schematic diagram of the transmission shaft flange that utilizes this wear-resistant and corrosion-resistant sealing surface structure.

[0023] Both the transmission shaft and the transmission shaft flange include a shaft body 1 and a metal sealing layer 2. The metal sealing layer 2 forms a metallurgical bond with the cylindrical surface of the 40Cr steel base with a diameter d. The outer circle is machined to the diameter D with a roughness of Ra0.2 or Ra0.4. The thickness t of the metal sealing layer 2 is 0.5-0.8mm, and the hardness of the metal sealing layer 2 is 550-650HV. The metal sealing layer 2 has the characteristic of being resistant to natural environmental corrosion. The transmission shaft (transmission shaft flange) has a paint protective layer 3 on the outer surface of the transmission housing. The paint protective layer 3 covers part of the metal sealing layer 2 (approximately 5-10mm wide).

[0024] When the metal sealing layer is made of an iron-based alloy, its preferred composition is shown in the table below:

[0025] Table 1. Composition of iron-based alloys (mass percentage)

[0026]

[0027] When the metal sealing layer is made of an iron-based alloy, its preferred composition is shown in the table below:

[0028] Table 2. Composition of nickel-based alloys (mass percentage)

[0029]

[0030] Figure 3 This is a schematic diagram of a mechanism where the base of the transmission shaft is in a rough machining state.

[0031] Figure 4 This is a schematic diagram of a mechanism where the transmission shaft flange base is in a rough machining state.

[0032] The diameter of the circular surface used for cladding is machined to dimension d, with a roughness of Ra3.2μm-Ra6.3μm. The transition of the cladding section is machined with a 45° bevel. Dimension d is 1±0.1mm smaller than D. The thickness t of the metal sealing layer 2 is 0.8-1.4mm. After cladding, C1 and other materials are precision machined to C. The diameter D1 of the cladding surface is ground to D, with a surface roughness of Ra0.2 or Ra0.4.

[0033] This example references laser cladding technology data. The transmission axis laser cladding process is referenced in Table 3, the transmission axis Franz laser cladding process is referenced in Table 2, and the composition of the cladding material is shown in Table 4.

[0034] Table 3 Laser Cladding Process Parameters for Transmission Axis

[0035]

[0036] Table 4. Composition of cladding materials (mass percentage)

[0037]

[0038] The obtained metal sealing layer thickness of the transmission shaft is t=1.4mm, with a hardness of 590HV. The metal sealing layer thickness of the transmission shaft flange is t=1.1mm, with a hardness of 620HV. No corrosion was observed in the 1000h neutral salt spray corrosion resistance test. Compared to carburized and induction hardened surfaces, its wear resistance is comparable, making it a viable alternative to chrome-plated surfaces, especially in corrosive environments such as coastal and marine settings.

[0039] in, Figure 5 This is a schematic diagram of one embodiment of a transmission shaft that utilizes a wear-resistant and corrosion-resistant sealing surface structure.

[0040] Figure 6 This is a schematic diagram of one embodiment of a transmission shaft flange that utilizes a wear-resistant and corrosion-resistant sealing surface structure.

[0041] This invention involves adding wear-resistant and corrosion-resistant material to the sealing surface of the transmission shaft (and combined transmission shaft flange) of an automotive transmission. This meets the dynamic operation requirements of the sealing ring and the transmission shaft, and prevents corrosion of the transmission shaft substrate from spreading to the sealing surface. This novel sealing structure can replace the consumption of expensive materials in the overall structure, and also replaces hard chrome plating, avoiding environmental pollution, preventing hydrogen embrittlement, and reducing the risk of structural fatigue failure. It offers significant economic and social benefits.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wear and corrosion resistant sealing surface structure applied to a transmission shaft or a flange of a transmission shaft, characterized in that: The device includes a shaft body, on which a metal sealing layer is machined in the area for fitting a sealing ring, and a protective layer is coated on the metal sealing layer; the metal sealing layer is machined onto the shaft body using laser cladding or thermal spraying; the metal sealing layer is made of an alloy material.

2. The abrasion and corrosion resistant sealing face structure of claim 1, wherein: The metal sealing layer is made of either iron-based alloys or nickel-based alloys.

3. The abrasion and corrosion resistant sealing face structure of claim 1, wherein: The thickness of the metal sealing layer is not less than 0.2 mm.

4. The wear-resistant and corrosion-resistant sealing surface structure according to claim 1, characterized in that: The protective layer is provided on the exposed area of ​​the shaft body and the surface of the adjacent part of the metal sealing layer.

5. The abrasion and corrosion resistant sealing face structure of claim 1, wherein: The protective layer is made of anti-corrosion paint.

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