Machining method of belt wheel for clutch

Abstract

The invention provides a method for machining a belt wheel for a clutch. The method comprises the process steps of material preparation, assembly, vacuum brazing and cutting. Through precise assembly and positioning among the belt wheel blank, the copper ring, the pressing head and the cushion block and in cooperation with the axial pressing and vacuum brazing process, the assembly coaxiality and positioning precision of the copper ring and the belt wheel blank are effectively improved, position deviation of the copper ring in the welding process is avoided, and the consistency of finished products is guaranteed; stable and reliable metallurgical bonding is formed between the copper ring and the inner wall of the ring groove through vacuum brazing, welding defects are effectively avoided, the sealing performance and the connecting strength are remarkably improved, and the reliability requirement for long-term operation of the clutch is met. After brazing, forming can be achieved only through simple cutting, the machining allowance is reduced, the technological process is simplified, and the production efficiency and the product percent of pass can be improved; the manufactured belt wheel for the clutch is compact in structure, excellent in magnetism isolating performance, mechanical performance and sealing performance and capable of better adapting to the actual working condition of the clutch, and the service life of a product is prolonged.

Description

Technical Field

[0001] This invention relates to the field of compressor parts manufacturing technology, and in particular to a method for machining a pulley for a clutch. Background Technology

[0002] Clutch pulleys are key components in power transmission systems, widely used in mechanical transmissions, automotive air conditioning, compressors, and other equipment. They primarily achieve power transmission and clutch control via belts. To meet requirements for sealing, magnetic shielding, and fit performance, clutch pulleys typically require a copper ring structure inside their base.

[0003] Currently, commonly used copper ring structures are mainly divided into segmented copper rings and full-circumference copper rings. Segmented copper rings are made by stamping discontinuous circumferential magnetic shielding grooves into the pulley base, and then installing copper material within these grooves, retaining a portion of the steel base to ensure the overall strength of the pulley. However, their magnetic shielding effect is relatively limited. In contrast, full-circumference copper rings offer superior magnetic shielding, but require a balance between airtightness, magnetic shielding performance, and structural strength.

[0004] In existing pulley processing, the bonding of copper rings and pulley bases often involves methods such as melting and filling magnetic grooves, laser welding, or conventional welding. These methods are prone to defects such as oxidation, porosity, and inclusions at the bonding interface, leading to unstable sealing performance and connection strength, making it difficult to ensure long-term reliable operation of the clutch. At the same time, the assembly and positioning accuracy of the copper ring and pulley base is low, coaxiality is difficult to control, and the copper ring is prone to displacement during welding, resulting in poor product consistency. In addition, the machining allowance is large and the process flow is cumbersome, which restricts the improvement of production efficiency and product qualification rate. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for machining clutch pulleys that features precise assembly, reliable welding, and a simple process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for machining a pulley for a clutch, the method comprising: Material preparation: Prepare pulley blanks, copper rings, pressure heads, and spacers; wherein, the pulley blank has an outer ring and a core post coaxially arranged between its first and second ends, and a radial connecting portion located between the outer ring and the core post; the radial connecting portion is provided with an annular groove, the opening of the annular groove facing the first end of the pulley blank; the structure of the copper ring matches the structure of the annular groove; the structure of the pressure head matches the structure of the first end of the pulley blank, and the end of the pressure head is provided with a pressure ring, the structure of which matches the structure of the annular groove; the structure of the spacer matches the structure of the second end of the pulley blank.

[0007] Assembly: Insert the pad into the second end of the pulley blank, insert the copper ring into the ring groove, insert the pressure head into the first end of the pulley blank, and apply an assembly clamping force parallel to the central axis of the pulley blank to the pressure head, so that the pressure ring part abuts against the copper ring.

[0008] Vacuum brazing: The assembled workpiece is placed into a vacuum brazing furnace for brazing at a vacuum level of 10. -3 With a pressure below MPa, a welding temperature of 1000–1100℃, and a welding time of 60–90 minutes, a sealed connection between the copper ring and the inner wall of the ring groove is achieved.

[0009] Cutting: The excess portion on both sides of the radial connecting part is removed by cutting, so that the copper ring passes through the radial connecting part axially, and a pulley for the clutch is obtained.

[0010] Preferably, the pulley blank is integrally formed from forged steel.

[0011] Preferably, the pulley blank is assembled into a split structure, the pulley blank includes an outer ring blank and a core blank, the inner wall of the outer ring blank has a first connecting part, the outer wall of the core blank has a second connecting part, and the first connecting part and the second connecting part are assembled to form the radial connecting part and the annular groove.

[0012] Preferably, the inner wall of the first connecting part has a first fitting part and a first annular groove forming part, and the outer wall of the second connecting part has a second fitting part and a second annular groove forming part. The first fitting part and the second fitting part fit together, and the annular groove is formed between the first annular groove forming part and the second annular groove forming part.

[0013] Preferably, a sealing groove is provided in the middle of the annular groove, and after vacuum brazing, the copper ring is filled into the sealing groove.

[0014] Preferably, the sealing groove is V-shaped, U-shaped, or trapezoidal.

[0015] Preferably, the outer diameter of the pressure ring portion is not greater than the outer diameter of the annular groove, and the inner diameter of the pressure ring portion is not less than the inner diameter of the annular groove.

[0016] Preferably, in the assembly step, the assembly clamping force is 15-20 MPa.

[0017] Preferably, the processing method of the clutch pulley further includes: pressure testing: supporting the first end of the outer ring of the clutch pulley, applying test pressure to the second end of the core column of the clutch pulley, and detecting whether the relative deformation of the two sides of the copper ring is less than 0.1 mm; wherein, the direction of the test pressure is parallel to the central axis of the clutch pulley.

[0018] Preferably, the test pressure is 31000-32000N.

[0019] Preferably, the processing method of the clutch pulley further includes: air tightness test: injecting test liquid into the first end of the clutch pulley, sealing the second end of the clutch pulley, applying test gas, and detecting whether air bubbles are generated in the test liquid.

[0020] Preferably, the pressure of the test gas is 0.4 to 0.8 MPa.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention effectively improves the coaxiality and positioning accuracy of the assembly between the pulley blank, copper ring, pressure head and pad by precise assembly and positioning between the pulley blank, copper ring, pressure head and pad, and by axial clamping and vacuum brazing process, avoiding positional displacement of the copper ring during welding and ensuring the consistency of the finished product; the use of vacuum brazing can form a stable and reliable metallurgical bond between the copper ring and the inner wall of the ring groove, effectively avoiding defects such as interface oxidation, porosity and inclusions, significantly improving sealing performance and connection strength, and meeting the reliability requirements of long-term clutch operation; after brazing, only simple cutting is required to form the pulley, reducing machining allowance, simplifying the process flow, and helping to improve production efficiency and product qualification rate; the final clutch pulley has a compact structure, excellent magnetic shielding performance, mechanical properties and sealing performance, and can better adapt to the actual working conditions of the clutch and extend the service life of the product. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the pulley blank, copper ring, pressure head, and pad block in a method for processing a clutch pulley according to the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the assembled workpiece.

[0024] Figure 3 This is a schematic diagram of the structure of the pulley used in the manufactured clutch.

[0025] Figure 4 This is a schematic diagram of another type of pulley blank according to the present invention.

[0026] Figure 5 This is a schematic diagram of the structure during a pressure test.

[0027] Figure 6 This is a schematic diagram of the structure during the airtightness test.

[0028] In the figure, 10-pulley blank, 11-outer ring, 12-core post, 13-radial connection part, 14-ring groove, 15-sealing groove, 20-copper ring, 30-pressure head, 31-pressure ring part, 40-pad block, 50-clutch pulley, 51-outer ring, 52-core post, 53-copper ring, 60-pulley blank, 61-outer ring blank, 62-core post blank, 63-first connection part, 631-first fitting part, 632-first ring groove forming part, 64-second connection part, 641-second fitting part, 642-second ring groove forming part, 65-ring groove, 66-sealing groove, 71-test liquid, 72-test gas. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0030] In the description of this invention, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0031] In the description of this invention, references to "one embodiment" or "some embodiments" mean that one or more embodiments of the invention include a particular feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "one embodiment," "some embodiments," "other embodiments," "and other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0032] This invention provides a method for machining a clutch pulley that features precise assembly, reliable welding, and a simple process. In some embodiments, the machining method for the clutch pulley includes: Material preparation: Prepare the pulley blank, copper ring, pressure head, and spacer. (Refer to...) Figure 1As shown, the pulley blank 10 has an outer ring 11 and a core post 12 coaxially arranged between its first end and second end, and a radial connecting portion 13 located between the outer ring 11 and the core post 12. It can be understood that the first end and the second end of the pulley blank 10 correspond to the two ends of the pulley blank 10 in the axial direction, respectively. Figure 1 The upper and lower ends of the pulley blank 10 are shown. An annular groove 14 is provided on the radial connecting portion 13, and the annular groove 14 is arranged in a ring around the outer periphery of the core post 12. The opening of the annular groove 14 faces the first end of the pulley blank 10 (corresponding to...). Figure 1 The upper end of the pulley blank 10 shown.

[0033] The structure of the copper ring 20 matches the structure of the annular groove 14. Specifically, the outer diameter of the copper ring 20 is not greater than the outer diameter of the annular groove 14, and the inner diameter of the copper ring 20 is not less than the inner diameter of the annular groove 14, so that the copper ring 20 can be installed into the annular groove 14.

[0034] The structure of the pressure head 30 matches the structure of the first end of the pulley blank 10. The end of the pressure head 30 is provided with a pressure ring 31, the structure of which matches the structure of the annular groove 14. Specifically, the structure of the pressure ring 31 is similar to the annular structure of the copper ring 20. The outer diameter of the pressure ring 31 is not greater than the outer diameter of the annular groove 14, and the inner diameter of the pressure ring 31 is not less than the inner diameter of the annular groove 14. The structure of the pad block 40 matches the structure of the second end of the pulley blank 10 (corresponding to...). Figure 1 The structure of the lower end of the pulley blank 10 shown is matched, and the pad 40 can be installed into the second end of the pulley blank 10.

[0035] By utilizing the structurally matched pulley blank 10, copper ring 20, pressure head 30, and pad 40, pre-positioning fit between various components can be achieved, which can improve the coaxiality and positioning accuracy of subsequent assembly and lay the foundation for stable welding.

[0036] In addition, during the material preparation stage, the pulley blank 10 and copper ring 20 can be pre-treated on the surface, such as by ultrasonic cleaning to remove oil and oxide scale, or by surface activation treatment to enhance the wettability and bonding strength of the interface during subsequent brazing.

[0037] Assembly: Reference Figure 2 As shown, the pad 40 is inserted into the second end of the pulley blank 10, the copper ring 20 is inserted into the annular groove 14, and the pressure head 30 is inserted into the first end of the pulley blank 10. An assembly clamping force F1 parallel to the central axis of the pulley blank is applied to the pressure head 30, causing the pressure ring part 31 to abut against the copper ring 20. The axially set assembly clamping force F1 can stably confine the copper ring 20 within the annular groove 14, preventing the copper ring 20 from shifting or deviating during brazing, and further ensuring the coaxiality of the copper ring 20 and the pulley blank 10 and the consistency of the finished product.

[0038] Vacuum brazing: The assembled workpiece is placed into a vacuum brazing furnace for brazing at a vacuum level of 10. -3 With a pressure below MPa, a welding temperature of 1000–1100℃, and a welding time of 60–90 minutes, a sealed connection is achieved between the copper ring 20 and the inner wall of the ring groove 14. The vacuum environment effectively avoids defects such as oxidation, porosity, and inclusions at the welding interface, enabling the copper ring 20 and the pulley blank 10 to form a strong metallurgical bond, thereby improving the connection strength and sealing reliability.

[0039] Cutting: The excess portion on both sides of the radial connecting part 13 is removed by cutting, so that the copper ring 20 passes through the radial connecting part 13 axially, thus producing a pulley for the clutch. The cutting process is simple, with a small machining allowance, which is conducive to improving production efficiency; the copper ring passes through the radial connecting part axially, which can achieve effective isolation between the outer ring and the core column, meeting the performance requirements of the clutch.

[0040] The cutting process can be completed in one setup using a CNC lathe or machining center. By precisely controlling the cutting parameters and tool path, the flatness and parallelism of the two end faces of the radial connection are ensured. After cutting, auxiliary processes such as deburring and chamfering can be added as needed to improve the safety of product assembly.

[0041] Reference Figure 3 As shown, in the clutch pulley 50 manufactured using the above method, the outer ring 51 and the core post 52 are coaxially arranged, and the copper ring 53 axially penetrates the radial connecting part, thus forming an effective physical isolation (no direct physical connection) between the outer ring 51 and the core post 52, achieving excellent magnetic shielding effect. Simultaneously, combined with a reliable vacuum brazing process, the finished product has a compact structure, possesses good mechanical properties and sealing reliability, and can better adapt to the actual working conditions of the clutch, extending the product's service life.

[0042] This invention improves the coaxiality and positioning accuracy of the copper ring 20 and pulley blank 10 by precisely assembling and positioning the pulley blank 10, copper ring 20, pressure head 30, and pad block 40, combined with axial clamping and vacuum brazing processes. This avoids positional displacement of the copper ring 20 during welding, ensuring product consistency. Vacuum brazing allows the copper ring 20 to form a stable and reliable metallurgical bond with the inner wall of the ring groove 14, effectively avoiding defects such as interface oxidation, porosity, and inclusions, significantly improving sealing performance and connection strength, and meeting the reliability requirements for long-term clutch operation. After brazing, only simple cutting is required for shaping, reducing machining allowance, simplifying the process, and improving production efficiency and product qualification rate. The resulting clutch pulley has a compact structure, excellent magnetic shielding, mechanical properties, and sealing performance, better adapting to actual clutch operating conditions and extending product service life.

[0043] To further optimize welding quality, the vacuum brazing process can employ multi-stage temperature control profiles. For example, preheating can be performed by first raising the temperature to 800°C at a lower rate, then rapidly increasing it to 1080°C. After welding, the temperature can be slowly cooled to below 200°C within the furnace before removal from the furnace, thereby reducing thermal stress and preventing deformation. Simultaneously, by controlling the stability of the vacuum level within the furnace and the purity of the brazing atmosphere, residual gas contamination of the interface can be minimized, ensuring that a continuous and dense brazing layer is formed between the copper ring 20 and the inner wall of the annular groove 14.

[0044] Reference Figure 1 In some preferred embodiments, a sealing groove 15 is provided in the middle of the annular groove 14. The sealing groove increases the contact area between the copper ring and the pulley blank, improving the weld strength and sealing effect, and further enhancing structural stability. Figure 3 As shown, after vacuum brazing, the copper ring 53 is filled into the sealing groove.

[0045] The shape of the sealing groove 15 can be designed as V-shaped, U-shaped, or trapezoidal, etc., according to actual needs, and its dimensional tolerances can be ensured through precision machining. For example, the included angle of the V-shaped sealing groove can be set to 60° to 90° and the depth to 0.2 to 0.5 mm, so as to form a wedge-shaped locking effect during brazing and further enhance the copper ring's resistance to axial pull-out.

[0046] The specific value of the assembly clamping force can be finely adjusted according to the material hardness and thickness of the copper ring 20 and the dimensions of the ring groove 14. Preferably, the assembly clamping force in the assembly step is 15-20 MPa. This range of assembly clamping force ensures reliable positioning of the copper ring while avoiding excessive pressure that could cause deformation of the copper ring or the blank, thus improving the stability of the assembly process. In some embodiments, the assembly clamping force is 18 MPa.

[0047] Reference Figure 1 In some embodiments, the pulley blank 10 is integrally formed from forged steel. The integral forged blank has high structural strength and good coaxiality, which helps to ensure the overall rigidity and service life of the pulley.

[0048] In other embodiments, the pulley blank is assembled from two separate parts. (Refer to...) Figure 4 As shown, the pulley blank 60 includes an outer ring blank 61 and a core blank 62. The inner wall of the outer ring blank 61 has a first connecting portion 63, and the outer wall of the core blank 62 has a second connecting portion 64. The first connecting portion 63 and the second connecting portion 64 are assembled to form a radial connecting portion and an annular groove 65. The split structure facilitates the machining and forming of the annular groove and the internal structure, which helps to reduce machining difficulty and improve production adaptability.

[0049] Furthermore, the inner wall of the first connecting portion 63 has a first fitting portion 631 and a first annular groove forming portion 632, and the outer wall of the second connecting portion 64 has a second fitting portion 641 and a second annular groove forming portion 642. The first fitting portion 631 and the second fitting portion 641 fit together, and an annular groove 65 is formed between the first annular groove forming portion 632 and the second annular groove forming portion 642. In application, the first fitting portion 631 and the second fitting portion 641 can be designed as a mutually fitting groove and flange structure. Their fitting together can ensure assembly accuracy and structural strength.

[0050] Furthermore, the inner wall of the first annular groove forming part 632 and the outer wall of the second annular groove forming part 642 are respectively provided with V-shaped grooves. After the outer ring blank 61 and the core column blank 62 are assembled, an annular groove 65 is formed between the first annular groove forming part 632 and the second annular groove forming part 642, and a sealing groove 66 is formed in the middle of the annular groove 65. The V-shaped sealing groove 66 can increase the welding joint area and improve the fixing effect and sealing performance of the copper ring. After vacuum brazing, the copper ring can fill into the sealing groove 66, thereby enhancing the welding stability and sealing performance of the copper ring.

[0051] In some embodiments, the machining method for the clutch pulley further includes: pressure testing: refer to Figure 5 As shown, the first end of the outer ring 51 of the clutch pulley 50 (corresponding to...) Figure 5 The lower end of the clutch pulley 50 shown is supported, and the second end of the core column 52 of the clutch pulley 50 (corresponding to) Figure 5 A test pressure F2 is applied to the upper end of the clutch pulley 50 (shown in the diagram) to check whether the relative deformation of the two side planes 511 and 521 of the copper ring 53 is less than 0.1 mm. The direction of the test pressure F2 is parallel to the central axis of the clutch pulley 50. If the relative deformation of the two side planes 511 and 521 of the copper ring 53 is less than 0.1 mm, the pressure test is qualified; otherwise, the pressure test is unqualified. The pressure test effectively verifies the structural strength of the clutch pulley 50 and the reliability of the copper ring connection, ensuring that the product meets the requirements of operating conditions.

[0052] In applications, pressure testing can be conducted using an electronic universal testing machine or a dedicated hydraulic testing bench, with displacement sensors monitoring the relative deformation of planes 511 and 521 in real time. Load-deformation curves can be recorded during testing to assess the product's stiffness and yield point. For products with excessive deformation, failure modes (such as copper ring debonding and billet yielding) can be analyzed to provide feedback for optimizing welding processes or structural design.

[0053] Furthermore, the test pressure is 31,000–32,000 N. This test pressure range corresponds to the maximum axial load that the clutch may withstand during actual operation, with a safety margin. The test pressure may be adjusted according to product specifications. In some embodiments, the test pressure is 31,500 N.

[0054] In some embodiments, the machining method for the clutch pulley further includes: air tightness test: refer to Figure 6 As shown, at the first end of the clutch pulley 50 (corresponding to...) Figure 5 Test fluid 71 is injected into the upper end of the clutch pulley 50 shown, and the second end of the clutch pulley 50 (corresponding to...) is injected into the second end of the clutch pulley 50. Figure 5 The clutch shown is sealed at the lower end of the pulley 50, and test gas 72 is applied to detect whether air bubbles are generated in the test liquid 71. The test liquid 71 can be water or oil, a substance used in existing airtightness tests, and the test gas 72 can be dry, clean air, nitrogen, or other inert gases. The airtightness test can visually and accurately detect the sealing performance of the copper ring weld, ensuring that the product is leak-free and meets the sealing requirements for use.

[0055] Furthermore, the pressure of the test gas 72 is 0.4–0.8 MPa. The pressure of the test gas 72 is slightly higher than the product's operating pressure to verify the sealing margin. For different applications, such as air conditioning compressor clutches or automotive transmission clutches, the test gas pressure can be adjusted according to the actual operating pressure. In some embodiments, the pressure of the test gas 72 is 0.6 MPa.

[0056] According to another aspect of the present invention, a pulley for a clutch is provided. (See reference...) Figure 3 As shown, the clutch pulley 50 has an outer ring 11 and a core post 12 coaxially arranged between its first and second ends, and a radial connecting portion located between the outer ring 11 and the core post 12. A copper ring 53 is provided in the radial connecting portion, axially penetrating the radial connecting portion, thus forming an effective physical isolation between the outer ring 51 and the core post 52, achieving excellent magnetic shielding. Simultaneously, through a reliable vacuum brazing process, the copper ring and the pulley substrate form a stable and reliable metallurgical bond, effectively avoiding defects such as interface oxidation, porosity, and inclusions. The finished product has a compact structure, combining good magnetic shielding performance, structural strength, and sealing reliability, better adapting to actual clutch operating conditions and extending product service life.

[0057] In summary, this invention provides a method for processing a clutch pulley. Through precise assembly and positioning of the pulley blank, copper ring, pressure head, and pad, combined with axial clamping and vacuum brazing, the coaxiality and positioning accuracy of the copper ring and pulley blank are effectively improved, preventing positional displacement of the copper ring during welding and ensuring product consistency. Vacuum brazing allows for a stable and reliable metallurgical bond between the copper ring and the inner wall of the ring groove, effectively avoiding defects such as interface oxidation, porosity, and inclusions, significantly improving sealing performance and connection strength, and meeting the reliability requirements for long-term clutch operation. After brazing, only simple cutting is required for shaping, reducing machining allowance, simplifying the process, and improving production efficiency and product qualification rate. The resulting clutch pulley has a compact structure, excellent magnetic shielding, mechanical properties, and sealing performance, better adapting to actual clutch operating conditions and extending product service life.

[0058] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A method for machining a pulley for a clutch, characterized in that: The machining method for the clutch pulley includes: Material preparation: Prepare pulley blanks, copper rings, pressure heads, and spacers; wherein, the pulley blank has an outer ring and a core post coaxially arranged between its first and second ends, and a radial connecting portion located between the outer ring and the core post; the radial connecting portion is provided with an annular groove, the opening of the annular groove facing the first end of the pulley blank; the structure of the copper ring matches the structure of the annular groove; the structure of the pressure head matches the structure of the first end of the pulley blank, and the end of the pressure head is provided with a pressure ring, the structure of which matches the structure of the annular groove; the structure of the spacer matches the structure of the second end of the pulley blank; Assembly: Insert the pad into the second end of the pulley blank, insert the copper ring into the ring groove, insert the pressure head into the first end of the pulley blank, and apply an assembly clamping force parallel to the central axis of the pulley blank to the pressure head, so that the pressure ring part abuts against the copper ring; Vacuum brazing: The assembled workpiece is placed into a vacuum brazing furnace for brazing at a vacuum level of 10. -3 Below MPa, the welding temperature is 1000~1100℃, and the welding time is 60~90 minutes to achieve a sealed connection between the copper ring and the inner wall of the ring groove; Cutting: The excess portion on both sides of the radial connecting part is removed by cutting, so that the copper ring passes through the radial connecting part axially, and a pulley for the clutch is obtained.

2. The method for machining a clutch pulley as described in claim 1, characterized in that: The pulley blank is integrally machined from forged steel.

3. The method for machining a clutch pulley as described in claim 1, characterized in that: The pulley blank is assembled into a split structure. The pulley blank includes an outer ring blank and a core blank. The inner wall of the outer ring blank has a first connecting part, and the outer wall of the core blank has a second connecting part. The first connecting part and the second connecting part are assembled to form the radial connecting part and the annular groove.

4. The method for machining a clutch pulley as described in claim 3, characterized in that: The inner wall of the first connecting part has a first fitting part and a first annular groove forming part, and the outer wall of the second connecting part has a second fitting part and a second annular groove forming part. The first fitting part and the second fitting part fit together, and the annular groove is formed between the first annular groove forming part and the second annular groove forming part.

5. The method for machining a clutch pulley as described in claim 1, characterized in that: A sealing groove is provided in the middle of the annular groove. After vacuum brazing, the copper ring is filled into the sealing groove.

6. The method for machining a clutch pulley as described in claim 5, characterized in that: The sealing groove is V-shaped, U-shaped, or trapezoidal.

7. The method for machining a clutch pulley as described in claim 1, characterized in that: The outer diameter of the pressure ring is not greater than the outer diameter of the ring groove, and the inner diameter of the pressure ring is not less than the inner diameter of the ring groove.

8. The method for machining a clutch pulley as described in claim 1, characterized in that: During the assembly process, the assembly clamping force is 15-20 MPa.

9. The method for machining a clutch pulley as described in claim 1, characterized in that: The processing method for the clutch pulley further includes: pressure testing: supporting the first end of the outer ring of the clutch pulley, applying test pressure to the second end of the core column of the clutch pulley, and detecting whether the relative deformation of the two sides of the copper ring is less than 0.1 mm; wherein, the direction of the test pressure is parallel to the central axis of the clutch pulley.

10. The method for machining a clutch pulley as described in claim 1, characterized in that: The processing method for the clutch pulley further includes: air tightness test: injecting test liquid into the first end of the clutch pulley, sealing the second end of the clutch pulley, applying test gas, and detecting whether air bubbles are generated in the test liquid.

Images