Automobile door hinge bearing with self-calibration compensation clearance and application of automobile door hinge bearing

Abstract

The invention relates to the technical field of automobile door hinge bearings, and discloses an automobile door hinge bearing with a self-calibration compensation gap and application thereof.The automobile door hinge bearing comprises a PTFE sliding layer, a toughness deformation layer covering the PTFE sliding layer and a middle layer connecting the PTFE sliding layer and the toughness deformation layer; the raw materials of the toughness deformation layer comprise a polyester material and / or a polyamide material. The automobile door hinge bearing can be matched with a shell in a high-precision mode, selection of metal base materials does not need to be limited, and the material adaptation range is effectively widened.

Description

Technical Field

[0001] This invention relates to the field of automotive door hinge bearing technology, and more particularly to an automotive door hinge bearing with self-calibrating compensation clearance and its application. Background Technology

[0002] Bearings are the core components of automotive door hinges, and their performance directly determines the smoothness and durability of the door's opening and closing. These bearings must withstand axial and radial loads on the door during service, requiring stringent precision in their fit.

[0003] Currently, most mainstream automotive door hinge bearings employ a multi-layered structure combining a metal substrate and a PTFE substrate. For example, Chinese patent CN202140442U discloses a self-lubricating bearing for automotive door hinges, which consists of a steel plate substrate, a spherical bronze powder layer, and a lead-free PTFE layer arranged sequentially from bottom to top. However, due to limitations in manufacturing processes and material properties, this self-lubricating bearing is difficult to use in door hinges to achieve a high-precision fit between the bearing and the housing. In actual use, it is prone to abnormal noise or abnormal wear due to clearance deviations.

[0004] Chinese patent CN101680479B discloses a caliable automotive door hinge bearing, wherein the sliding material metal substrate has a strength of <100 N / mm². 2 The yield point is determined by utilizing the plastic deformation capability of the metal substrate to achieve high calibration capability, and the gap meets the requirements for high-precision fit. However, the metal substrate of this solution is limited to aluminum alloy, resulting in a narrow range of material choices that are difficult to adapt to diverse working conditions and cost requirements. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an automotive door hinge bearing with self-calibrating compensation clearance, which can not only fit with the housing with high precision but also eliminates the need to limit the selection of metal substrates, effectively broadening the range of material compatibility.

[0006] The specific technical solution of the present invention is as follows: an automotive door hinge bearing with self-calibrating compensation gap, comprising a PTFE sliding layer, a tough deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the tough deformation layer, wherein the raw material of the tough deformation layer comprises polyester material and / or polyamide material.

[0007] Optionally, the raw material of the toughness deformation layer may also include conductive additives.

[0008] Preferably, the raw material of the toughness deformation layer comprises 82-90% polymer substrate and 10-18% conductive additive by mass fraction.

[0009] Optionally, the conductive additive includes one or more of carbon fiber, graphite, and carbon black.

[0010] Optionally, the resistivity of the ductile deformation layer is ≤10. 4 Ω•cm, elongation at break of material ≥2%.

[0011] Optionally, the intermediate layer is a porous metal mesh, and the porosity of the porous metal mesh is ≥30%.

[0012] Preferably, the porosity of the porous metal mesh is 50-70%.

[0013] Optionally, the PTFE sliding layer and the intermediate layer are connected by a sintering process, and the tough deformation layer and the intermediate layer are connected by a hot pressing process.

[0014] Optionally, the raw material of the PTFE sliding layer comprises 40-99% PTFE and 1-60% wear-resistant additives by mass fraction.

[0015] Preferably, the raw material of the PTFE sliding layer comprises 60-70% PTFE and 30-40% wear-resistant additives by mass fraction.

[0016] Optionally, the wear-resistant additive includes one or more of mineral powders, sulfides, and fibers.

[0017] Another specific technical solution of the present invention is: the application of a self-calibrating and compensating gap automotive door hinge bearing in a door hinge, wherein the automotive door hinge bearing is the aforementioned automotive door hinge bearing, comprising the following steps: S1: The automotive door hinge bearing is assembled into the bearing housing. After being subjected to force by a forming tool, the tough deformation layer undergoes a self-calibrating deformation to obtain the crude product. S2: The crude product is subjected to electrophoresis and then dried at a high temperature of 160~220℃, and the toughness deformation layer undergoes secondary self-calibration deformation.

[0018] Compared with the prior art, the present invention has at least the following advantages: (1) By setting a tough deformation layer on the outer layer, the automotive door hinge bearing has good tough deformation ability, thereby realizing the self-calibration and gap compensation function. Specifically, after the bearing is assembled into the housing, the tough deformation layer undergoes plastic expansion by applying force through the forming tool, which quickly eliminates the macro gap between the bearing and the housing, so that the outer wall of the bearing and the inner wall of the housing are initially attached. In the high-temperature drying process after electrophoresis, the polymer layer undergoes plastic deformation again under the combined action of temperature of 160~220℃ and assembly constraints, eliminating the micro gap remaining after the first self-calibration, and realizing the high-precision fit between the bearing and the housing. (2) In the traditional scheme, the metal substrate simultaneously undertakes the functions of structural support and gap compensation. In this invention, these two functions are separated. The porous metal mesh is only responsible for structural support and interlayer connection. The gap compensation function is achieved by the outer conductive toughness deformation layer through two self-calibrations. Since the porous metal mesh does not need to have the plastic deformation capability of low yield point, the metal substrate can be flexibly selected according to the cost, strength and corrosion resistance requirements of different working conditions. This breaks the limitation of the existing technology on aluminum alloy substrate, effectively broadens the range of material compatibility, fills the industry gap, and has great practical application value. (3) The automotive door hinge bearing of the present invention consists of a PTFE sliding layer, an intermediate layer and a tough deformation layer from bottom to top. The PTFE sliding layer replaces the metal substrate in the traditional solution. The intermediate layer uses a porous metal mesh instead of a solid metal plate. While ensuring the structural support strength, it further reduces the amount of metal used. The density of the polymer material in the conductive and tough polymer layer is much lower than that of the metal, thereby achieving the lightweighting of the automotive door hinge bearing. It is suitable for scenarios with strict requirements for lightweighting, such as new energy vehicles and rail transit vehicles. (4) This invention adds a conductive additive to the tough deformation layer, giving it a certain conductivity. During the opening and closing process of the car door hinge, static electricity is generated by the friction between the metal parts. The resistivity of the tough deformation layer is ≤10. 4 Ω・cm can promptly conduct and release the generated static electricity, preventing static electricity accumulation from affecting the electronic components of the car door. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] In the diagram: 1. PTFE sliding layer; 2. Intermediate layer; 3. Tough deformation layer. Detailed Implementation

[0021] The present invention will now be described through specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in the present invention, and the scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

[0022] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless otherwise specified, the raw materials and equipment used in this invention are conventional in the art and can be obtained through conventional commercial means; unless otherwise specified, the methods used in this invention are conventional methods in the art.

[0023] In this invention, PTFE refers to polytetrafluoroethylene, PA66 refers to polyhexamethylene adipamide, and PET refers to polyethylene terephthalate.

[0024] Example 1: This invention provides an automotive door hinge bearing with self-calibrating compensation clearance, comprising a PTFE sliding layer, a ductile deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the ductile deformation layer; the raw materials of the PTFE sliding layer are PTFE, graphite and molybdenum disulfide; the intermediate layer adopts a porous metal mesh, and in this embodiment, a copper mesh is adopted; the raw materials of the ductile deformation layer are PA66 and graphite.

[0025] The preparation method of the aforementioned automotive door hinge bearing is as follows: 65% PTFE, 20% graphite, and 15% molybdenum disulfide are mixed evenly and sintered onto one side of a porous copper mesh to obtain a double-layer composite material. 90% PA66 and 10% graphite are mixed, extruded, and granulated to obtain polymer composite material particles. These particles are then composited onto the other side of the copper mesh using a hot-pressing process to obtain a three-layer composite material. Finally, the three-layer composite material is processed into an automotive door hinge bearing. In this preparation method, the sintering, hot-pressing processes, and the specific operating steps and process conditions for making the composite material into a bearing are all conventional methods known to those skilled in the art and will not be elaborated here.

[0026] The structure of the three-layer composite material of the present invention is as follows: Figure 1 As shown, from bottom to top, the layers are a PTFE sliding layer 1, an intermediate layer 2, and a tough deformation layer 3, which are sequentially covered.

[0027] The application method of the aforementioned automotive door hinge bearing is as follows: First, the automotive door hinge bearing is assembled into the bearing housing. Force is applied through a calibration mandrel, causing the toughness deformation layer to undergo a first self-calibrating deformation, resulting in a rough product. Then, the rough product undergoes electrophoretic treatment, followed by high-temperature drying at 160℃ for 30 minutes, causing a second self-calibrating deformation in the toughness deformation layer, achieving a high-precision fit between the bearing and the housing. In this application method, the electrophoretic treatment is a conventional process known to those skilled in the art and will not be elaborated upon here.

[0028] Example 2: This invention provides an automotive door hinge bearing with self-calibrating compensation clearance, comprising a PTFE sliding layer, a ductile deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the ductile deformation layer; the raw materials of the PTFE sliding layer are PTFE, graphite, and molybdenum disulfide; the intermediate layer adopts a porous metal mesh, and in this embodiment, a copper mesh is used; the raw materials of the ductile deformation layer are PA66, graphite, and graphene.

[0029] The preparation method of the aforementioned automotive door hinge bearing is as follows: 65% PTFE is uniformly mixed with 20% graphite and 15% molybdenum disulfide, and then sintered onto one side of a porous copper mesh to obtain a double-layer composite material. 82% PA66 is mixed with 15% graphite and 3% graphene, extruded and granulated to obtain polymer composite material particles. These particles are then composited onto the other side of the copper mesh using a hot-pressing process to obtain a three-layer composite material. Finally, the three-layer composite material is processed into an automotive door hinge bearing. In this preparation method, the sintering, hot-pressing processes, and the specific operating steps and process conditions for making the composite material into a bearing are all conventional methods known to those skilled in the art and will not be elaborated here.

[0030] The application method of the aforementioned automotive door hinge bearing is as follows: First, the automotive door hinge bearing is assembled into the bearing housing. Force is applied through a calibration mandrel, causing the toughness deformation layer to undergo a first self-calibrating deformation, resulting in a rough product. Then, the rough product undergoes electrophoretic treatment, followed by high-temperature drying at 200℃ for 30 minutes, causing a second self-calibrating deformation in the toughness deformation layer, achieving a high-precision fit between the bearing and the housing. In this application method, the electrophoretic treatment is a conventional process known to those skilled in the art and will not be elaborated upon here.

[0031] Example 3: This invention provides an automotive door hinge bearing with self-calibrating compensation clearance, comprising a PTFE sliding layer, a tough deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the tough deformation layer; the raw materials of the PTFE sliding layer are PTFE, graphite and molybdenum disulfide; the intermediate layer adopts a porous metal mesh, and in this embodiment, a copper mesh is adopted; the raw materials of the tough deformation layer are PET, graphite and graphene.

[0032] The preparation method of the aforementioned automotive door hinge bearing is as follows: 65% PTFE, 20% graphite, and 15% molybdenum disulfide are mixed uniformly and sintered onto one side of a porous copper mesh to obtain a double-layer composite material. 82% PET, 15% graphite, and 3% graphene are mixed, extruded, and granulated to obtain polymer composite material particles. These particles are then composited onto the other side of the copper mesh using a hot-pressing process to obtain a three-layer composite material. Finally, the three-layer composite material is processed into an automotive door hinge bearing. In this preparation method, the sintering, hot-pressing processes, and the specific operating steps and process conditions for making the composite material into a bearing are all conventional methods known to those skilled in the art and will not be elaborated here.

[0033] The application method of the aforementioned automotive door hinge bearing is as follows: First, the automotive door hinge bearing is assembled into the bearing housing. After applying force through a calibration mandrel, the toughness deformation layer undergoes a first self-calibrating deformation, yielding a rough product. Then, the rough product undergoes electrophoretic treatment, followed by high-temperature drying at 220℃ for 30 minutes, causing a second self-calibrating deformation in the toughness deformation layer, achieving a high-precision fit between the bearing and the housing. In this application method, the electrophoretic treatment is a conventional process known to those skilled in the art and will not be elaborated upon here.

[0034] Example 4: This invention provides an automotive door hinge bearing with self-calibrating compensation clearance, comprising a PTFE sliding layer, a tough deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the tough deformation layer; the raw materials of the PTFE sliding layer are PTFE, graphite and molybdenum disulfide; the intermediate layer adopts a porous metal mesh, and in this embodiment, a copper mesh is used; the raw materials of the tough deformation layer are PA66, PET, graphite and graphene.

[0035] The preparation method of the aforementioned automotive door hinge bearing is as follows: 65% PTFE is uniformly mixed with 20% graphite and 15% molybdenum disulfide, and then sintered onto one side of a porous copper mesh to obtain a double-layer composite material. 70% PA66 is mixed with 12% PET, 15% graphite, and 3% graphene, and extruded to obtain polymer composite material particles. These particles are then composited onto the other side of the copper mesh using a hot-pressing process to obtain a three-layer composite material. Finally, the three-layer composite material is processed into an automotive door hinge bearing. In this preparation method, the sintering, hot-pressing processes, and the specific operating steps and process conditions for making the composite material into a bearing are all conventional methods known to those skilled in the art and will not be elaborated here.

[0036] The application method of the aforementioned automotive door hinge bearing is as follows: First, the automotive door hinge bearing is assembled into the bearing housing. After applying force through a calibration mandrel, the toughness deformation layer undergoes a first self-calibrating deformation, yielding a rough product. Then, the rough product undergoes electrophoretic treatment, followed by high-temperature drying at 220℃ for 30 minutes, causing a second self-calibrating deformation in the toughness deformation layer, achieving a high-precision fit between the bearing and the housing. In this application method, the electrophoretic treatment is a conventional process known to those skilled in the art and will not be elaborated upon here.

[0037] Example 5: This invention provides an automotive door hinge bearing with self-calibrating compensation clearance, comprising a PTFE sliding layer, a tough deformation layer covering the PTFE sliding layer, and an intermediate layer connecting the PTFE sliding layer and the tough deformation layer; the raw materials of the PTFE sliding layer are PTFE, graphite and molybdenum disulfide; the intermediate layer adopts a porous metal mesh, and in this embodiment, a copper mesh is used; the raw materials of the tough deformation layer are PA66, PET, graphite and graphene.

[0038] The preparation method of the aforementioned automotive door hinge bearing is as follows: 65% PTFE is uniformly mixed with 20% graphite and 15% molybdenum disulfide, and then sintered onto one side of a porous copper mesh to obtain a double-layer composite material. 12% PA66 is mixed with 70% PET, 15% graphite, and 3% graphene, and extruded to obtain polymer composite material particles. These particles are then composited onto the other side of the copper mesh using a hot-pressing process to obtain a three-layer composite material. Finally, the three-layer composite material is processed into an automotive door hinge bearing. In this preparation method, the sintering, hot-pressing processes, and the specific operating steps and process conditions for making the composite material into a bearing are all conventional methods known to those skilled in the art and will not be elaborated here.

[0039] The application method of the aforementioned automotive door hinge bearing is as follows: First, the automotive door hinge bearing is assembled into the bearing housing. After applying force through a calibration mandrel, the toughness deformation layer undergoes a first self-calibrating deformation, yielding a rough product. Then, the rough product undergoes electrophoretic treatment, followed by high-temperature drying at 220℃ for 30 minutes, causing a second self-calibrating deformation in the toughness deformation layer, achieving a high-precision fit between the bearing and the housing. In this application method, the electrophoretic treatment is a conventional process known to those skilled in the art and will not be elaborated upon here.

[0040] Samples were prepared from a portion of the polymer composite material particles obtained in Examples 1 to 5, and resistivity and elongation at break were tested. The resistivity testing standard was GB / T 31838.3—2019; the elongation at break standard was GB / T1040.2—2018. The test results are shown in Table 1.

[0041] Table 1 Summary of the properties of polymer composite materials in Examples 1-5 As can be seen from Table 1, the resistivity of the polymer composite materials in Examples 1 to 5 is ≤10. 4 The material has an elongation at break of ≥2% (Ω•cm), which proves that the tough deformation layer made of this polymer composite material has stable plastic deformation capability, can support the realization of two self-calibration functions, and has excellent static dissipation capability, which can meet the application scenarios of automotive door hinges.

[0042] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An automotive door hinge bearing with self-calibrating compensation gap, characterized in that The PTFE sliding layer, the ductile deformation layer, and the intermediate layer are connected, and the material of the ductile deformation layer comprises polyester material and / or polyamide material.

2. A door hinge bearing for a vehicle having a self-aligning compensation gap as claimed in claim 1, characterized in that The material of the ductile deformation layer further comprises an electrically conductive additive.

3. A door hinge bearing for a vehicle having a self-aligning compensation gap as claimed in claim 2, characterized in that The material of the ductile deformation layer comprises 82-90% polymer base material and 10-18% electrically conductive additive by mass fraction.

4. The automotive door hinge bearing with self-aligning compensation gap of claim 2, wherein, The electrically conductive additive comprises one or more of carbon fiber, graphite, and carbon black.

5. The automotive door hinge bearing with self-aligning compensation gap of claim 2, wherein, The ductile deformation layer has a resistivity of ≤ 10 4 Ω•cm, and an elongation at break of ≥ 2%.

6. The automotive door hinge bearing with self-aligning compensation gap of claim 1, wherein, The intermediate layer is a porous metal mesh, and the porosity of the porous metal mesh is greater than or equal to 30%.

7. A door hinge bearing for a vehicle having a self-aligning compensation gap as claimed in claim 6, characterized in that The PTFE sliding layer and the intermediate layer are connected through a sintering process, and the ductile deformation layer and the intermediate layer are connected through a hot-pressing process.

8. A door hinge bearing with self-aligning compensation gap for a vehicle according to any one of claims 1 to 7, characterized in that The material of the PTFE sliding layer comprises 40-99% PTFE and 1-60% wear-resistant additive by mass fraction.

9. A door hinge bearing for a vehicle having a self-aligning compensation gap as claimed in claim 8, characterized in that The wear-resistant additive comprises one or more of mineral powder, sulfide, and fiber.

10. Use of a self-compensating gap-corrected automotive door hinge bearing according to any one of claims 1 to 9, characterized in that The method comprises the following steps: S1: assembling the automobile door hinge bearing into the bearing shell, applying force through a molding tool, and causing the ductile deformation layer to undergo a first self-calibration deformation to obtain a crude product; S2: performing electrophoresis treatment on the crude product, and then performing high-temperature drying at 160-220 DEG C, and causing the ductile deformation layer to undergo a second self-calibration deformation.

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