A method for machining a clutch outer hub gear assembly

Abstract

The present invention provides a clutch outer hub gear assembly processing method, which can reduce the positioning surface switching during the clutch outer hub gear assembly processing, improve processing efficiency and product quality, and reduce the use of processing equipment. The processing method includes the following steps: determining the positioning reference and clamping, positioning with the large end face of the hub seat and the gear, and clamping the positioning position; rough turning the outer hub seat inner hole and the outer hub seat small end inner hole; grinding the inner hole, fine grinding the outer hub seat inner hole and the outer hub seat small end inner hole to ensure the roughness and cylindricity of the inner hole; cutting the outer hub seat large groove and cutting out the outer hub seat sealing oil groove; cutting the outer hub seat small groove and cutting out the outer hub seat retaining ring groove; turning the outer hub seat outer circle, fine turning the outer hub seat outer circle, ensuring the AB reference and outer circle coaxiality and the outer circle cylindricity; turning the outer hub bottom surface and the inner hole, fine turning the outer hub bottom surface and the φ103.2mm outer hub inner hole, ensuring the roundness of the outer hub inner hole and the coaxiality with the AB reference; cutting the outer hub groove and cutting out the outer hub retaining ring groove.

Description

Technical Field

[0001] The present invention relates to the field of clutch parts processing, in particular to a clutch outer hub gear assembly processing method. Background Art

[0002] The clutch outer hub gear assembly is formed by welding three separate components—the outer hub, outer hub seat, and gear—together in two passes. Its complex structure requires the internal assembly of needle roller bearings, end bearings, rubber seals, sealing rings, piston and cylinder hubs, mating plates, and inner and outer retaining rings. High assembly precision is required, and numerous critical characteristic dimensions are required. Furthermore, both the outer hub seat and the outer hub are thin-walled components, which dissipates heat during processing and presents a high risk of deformation.

[0003] The product uses the 42mm inner hole of the outer hub as the A reference. The needle bearing is assembled near the small end of the reference inner hole, and the rubber seal is assembled near the large end. The inner hole has very high requirements on roundness, cylindricity, roughness and size.

[0004] The 52mm inner hole is the B reference, and it needs to be assembled with a needle bearing. The large end face of the outer hub seat is assembled with an end bearing. One of the important indicators of the dual-clutch operating parameters, PT (oil pressure fluctuation), is mainly guaranteed by the AB reference and the accuracy of the large end face. The end face is required to detect the runout ≤0.01 with the AB reference; the piston is assembled at the outer hub diameter of 103.2, and there are coaxiality requirements with the A reference, and there are requirements for size and roughness; the outer circle of the outer hub seat and the A reference of the outer hub seat inner hole have coaxiality requirements.

[0005] Traditional machining of this part requires first machining the inner bore and large end face of the outer hub, using the small end of the gear for centering. The outer diameter of the outer hub is then machined using the inner bore and large end face for positioning. Finally, the inner bore and large end face are used to position the inner bore and groove of the outer hub. This requires multiple datum changes and the coordination of multiple machines. This results in low machining efficiency, insufficient process assurance, and a high defect rate. Summary of the Invention

[0006] The object of the present invention is to provide a clutch outer hub gear assembly processing method, which can reduce the positioning surface switching during the clutch outer hub gear assembly processing, improve processing efficiency and product quality, and at the same time reduce the use of processing equipment.

[0007] The embodiment of the present invention is achieved as follows:

[0008] A method for machining a clutch outer hub gear assembly, wherein the outer hub gear assembly comprises an outer hub, an outer hub seat, and a gear assembled together in sequence, and the machining method comprises the following steps:

[0009] Determine the positioning reference and clamping, locate the hub seat large end face and gear, and clamp the positioning position;

[0010] Rough turning the inner hole of the outer hub and the inner hole of the outer hub small end. The inner hole of the outer hub and the inner hole of the outer hub small end are reverse steps. First, rough turning the φ52mm inner hole of the outer hub, and then rough turning the φ42mm inner hole of the outer hub small end; grind the inner hole, and fine grind the inner hole of the outer hub and the inner hole of the outer hub small end to ensure the roughness and cylindricity of the inner hole;

[0011] Cut a large groove on the outer hub and cut out the sealing oil groove on the outer hub;

[0012] Cut a small groove on the outer hub and a groove for the outer hub ring;

[0013] Turn the outer circle of the outer hub seat, and finish turn the outer circle of the outer hub seat to ensure the coaxiality of the AB reference and the outer circle and the cylindricity of the outer circle;

[0014] Turn the bottom surface and inner hole of the outer hub, and precision turn the bottom surface of the outer hub and the φ103.2mm inner hole of the outer hub to ensure the roundness of the inner hole of the outer hub and the coaxiality with the AB reference;

[0015] Cut the outer hub groove and the outer hub retaining ring groove.

[0016] In a preferred embodiment of the present invention, in the steps of processing the inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat, the fine grinding allowance is ensured to be 0.03 mm per side.

[0017] In a preferred embodiment of the present invention, in the above-mentioned step of cutting the large groove of the outer hub seat, the outer hub seat sealing oil groove is a 4mm sealing oil seal, and a 3mm pre-groove is cut first and then fine processing is performed.

[0018] In a preferred embodiment of the present invention, the outer circle dimensions of the outer hub seat are φ47mm and φ52.68mm, and the outer hub seat is formed by turning in one step, with a turning allowance of 0.12mm on one side.

[0019] In a preferred embodiment of the present invention, in the above-mentioned outer hub inner hole processing step, direct turning is performed, and a turning allowance of 0.15 mm is left on one side.

[0020] In a preferred embodiment of the present invention, the above-mentioned hub seat large end face and gear positioning are specifically based on the φ42 inner hole A and the φ52 inner hole B, the gear center is positioned, the gear pitch circle is centered, and the pitch circle clamp is used for centering and clamping, wherein the positioning end face is provided with an airtight detection and end face clamping mechanism.

[0021] In a preferred embodiment of the present invention, in the above-mentioned steps of rough turning the inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat, a φ36mm inner hole is also provided at the mouth of the outer hub seat, and a special tool is required to open the φ36mm inner hole before rough turning operation; during the fine grinding process, a special tool is also used to open the φ36mm inner hole of the grinding rod, and the diameter of the grinding wheel during the fine grinding process needs to be less than 35mm, and the grinding wheel is a split T-type grinding wheel, and the CBN material grinding wheel grit size: 80.

[0022] In a preferred embodiment of the present invention, the parameters for grinding the inner hole are: grinding parameters: grinding wheel linear speed 3000 mm / s; rough grinding: residual amount 0.1 mm, feed speed: 0.8 mm / min; semi-fine grinding: residual amount 0.02 mm, feed speed 0.5 mm / min; fine grinding: residual amount 0.008 mm, feed speed: 0.04 mm / min.

[0023] The beneficial effects of the embodiments of the present invention are as follows: the present invention uses the large end face of the hub seat and the gear for positioning throughout the entire process, thereby completing the processing of the outer hub gear assembly; and avoiding multiple reference conversions, reducing indirect dimensional assurance, improving processing efficiency, improving process capabilities, improving quality, and reducing process waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 Schematic diagram of the structure of the clutch outer hub gear assembly according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of rough turning of a φ52mm inner hole and a φ42mm inner hole according to an embodiment of the present invention;

[0027] Figure 3 These are the grinding wheel rod and grinding wheel used in fine grinding of φ52mm inner holes and φ42mm inner holes according to the embodiment of the present invention. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0033] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] First embodiment

[0035] See Figure 1-3 This embodiment provides a clutch outer hub gear assembly machining method for simultaneously ensuring multiple dimensions, including the outer hub seat inner diameter, outer diameter, end face, inner bore, and retaining ring groove. This method avoids multiple datum conversions, reduces indirect dimensional assurance, improves machining efficiency, enhances process capability, improves quality, and reduces process waste.

[0036] The outer hub gear assembly includes an outer hub, an outer hub seat, and a gear that are assembled together in sequence. The processing method is a turning and grinding integrated processing process, which specifically includes the following steps:

[0037] a. Determine the positioning reference and clamping, locate the hub seat large end face and gear, and clamp the positioning position.

[0038] There are inner holes at both ends of the outer hub gear assembly. The difference in the inner hole diameters of the outer hub and the outer hub seat is φ103mm and φ36mm respectively, and φ52mm and φ36mm respectively. In this embodiment, the one with the smaller step difference is selected as the inverted step. Therefore, the large end face is close to the tooling in the processing direction, and the outer hub is outward in the product clamping direction. In order to ensure the runout of the large end of the hub seat relative to the inner hole, the large end face needs to be positioned axially. In order to ensure the accuracy of the gear, the gear needs to be centered. Final positioning reference: the large end face and the gear are positioned, and the gear position is clamped. In order to ensure accurate end face positioning, an airtight test is added to the end face to ensure accurate positioning. In order to increase the clamping force and maintain rigidity, an end face clamping mechanism is added, and the inner hole, end face, outer circle, and groove positions are processed and formed in one step. The requirements for the inner hole, end face, outer circle, and groove positions are met at the same time.

[0039] b. The previous process of gear making and welding needs to ensure the gear accuracy and meet the cumulative runout of 0.05mm.

[0040] c. Rough turn the inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat. The inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat are reverse steps. Rough turn the φ52 inner hole of the outer hub seat first, and then rough turn the φ42mm inner hole of the small end of the outer hub seat.

[0041] This embodiment uses the end face and gear positioning and clamping to rough-turn the φ52mm and φ42mm inner holes; the φ52mm inner hole and the φ42mm inner hole are counter-stepped, the φ52mm inner hole is inward, then the φ42mm inner hole, and there is a φ36mm inner hole at the mouth. The inner hole at the mouth of the blank does not need to be fine-machined after completion. Due to the position limitations of the φ52mm and φ42mm inner holes, rough-turning is required; the main reference of the product is based on the φ42mm inner hole A and the φ52mm inner hole B. Both reference positions need to be fine-machined, and there are runout requirements with the large end, so the large end face needs to be positioned; product processing needs to ensure gear accuracy for subsequent gear fine-machining, so it is necessary to position it with the gear center. The final positioning chooses large end face positioning, gear pitch circle centering, and uses a pitch circle clamp for centering and clamping;

[0042] d. Grind the inner hole, and fine-grind the inner hole of the outer hub and the inner hole of the small end of the outer hub to ensure the roughness and cylindricity of the inner hole.

[0043] In this embodiment, the end faces and gears are positioned and clamped, and the φ52mm and φ42mm inner holes of the outer hub are fine-ground to ensure roughness and cylindricity. Since the φ52mm and φ42mm inner holes are rough-turned and fine-ground, too little fine-turning allowance can easily cause tool vibration. The fine-grinding allowance is 0.03mm per side, resulting in an overall single-side allowance of 0.15mm.

[0044] e. Cut a large groove on the outer hub and cut out the sealing oil groove on the outer hub.

[0045] In this embodiment, the end face and gear are positioned and clamped to cut a 4mm sealing oil groove on the outer hub. Since the 4mm sealing oil groove is hard-turned after heat treatment, the surface hardness of the product is 58-62HRC. The cutting depth is deep and the groove width is large. The groove is located at a thin wall, which is not suitable for large cutting. Therefore, a 3mm pre-groove is cut in the blank in the previous process.

[0046] f. Cut a small groove on the outer hub and cut out the outer hub retaining ring groove.

[0047] In this embodiment, the end face and the gear are positioned and clamped, and a 1.88mm collar groove is cut on the outer hub seat. The width and depth of the 1.88mm collar groove are suitable for direct cutting.

[0048] g. Turn the outer circle of the outer hub seat, and finish turn the outer circle of the outer hub seat to ensure the coaxiality of the AB reference and the outer circle and the cylindricity of the outer circle;

[0049] In this embodiment, the end face and the gear are positioned and clamped, and the outer circle of the outer hub is precision turned to ensure the coaxiality of the AB reference and the outer circle and the outer circle cylindricity; the outer circle dimensions of the outer hub are φ47mm and φ52.68mm, and are formed by turning in one step, with a single-side turning allowance of 0.12mm;

[0050] h. Turn the bottom surface and inner hole of the outer hub, and precision turn the bottom surface of the outer hub and the φ103.2mm inner hole of the outer hub to ensure the roundness of the inner hole of the outer hub and the coaxiality with the AB reference; the inner hole of the outer hub is φ103.2mm and is directly turned, but there is a risk of being affected by the welding process, and a turning allowance of 0.15mm is left on one side.

[0051] i. Cut the outer hub groove and the outer hub ring groove. If the material is soft, the groove can be cut directly.

[0052] The specific steps and parameters of the process of turning inner holes, turning outer circles, end faces, and cutting grooves in this embodiment are as follows:

[0053] 1. The φ52mm inner hole and φ42mm inner hole are inverted steps, and there is a 36mm diameter inner hole at the mouth. Therefore, a special tool needs to be designed to step over the φ36mm inner hole and rough turn the φ42mm and φ52mm inner holes; Feed parameters: speed -800r / min feed -0.15mm / r, the tool diagram is shown in Figure 2 ;

[0054] 2. The φ52mm and φ42mm inner holes are stepped, and there is a 36mm inner hole at the mouth. Therefore, the grinding rod also requires a special tool to open the φ36mm inner hole. To ensure the passage of the grinding wheel, the grinding wheel diameter must be less than 35mm. The difference between the 36 and 52 single-side steps is 8mm, leaving only a total of 19mm for the grinding rod diameter and the grinding wheel diameter. In order to maintain the rigidity of the grinding rod while increasing the grinding volume, improving efficiency and reducing costs, the grinding rod is made of carbide steel, and the grinding wheel is a split T-type grinding wheel with a CBN material and a grit size of 80. See the grinding wheel diagram. Figure 3 ;

[0055] 3. Grinding parameters: Grinding wheel linear speed 3000mm / s; Rough grinding: Residue 0.1mm, Feed speed: 0.8mm / min; Semi-fine grinding: Residue 0.02mm, Feed speed 0.5mm / min; Fine grinding: Residue 0.008mm, Feed speed: 0.04mm / min.

[0056] 4. Due to the small gap between the outer diameter of the hub seat and the inner hole of the hub, a dedicated grooving tool is required to ensure smooth cutting. Grooving parameters: Speed: 200 rpm Feed: 0.2 mm / r.

[0057] 5. According to the process requirements, turning and grinding functions are required at the same time, double pulling cylinders are required to ensure the clamping of the pitch circle and the tightening of the end face, end face air tightness detection is required, and equipment with air detection or contact detection capabilities is required. After investigation, the turning and grinding center was finally selected.

[0058] In summary, the present invention uses the large end face of the hub seat and the gear for positioning throughout the entire process, and can complete the processing of the outer hub gear assembly; and avoid multiple reference conversions, reduce indirect size assurance, improve processing efficiency, improve process capabilities, improve quality and reduce process waste.

[0059] This specification describes examples of embodiments of the present invention and is not intended to illustrate and describe all possible forms of the invention. It should be understood that the embodiments described in this specification may be implemented in a variety of alternative forms. The figures need not be drawn to scale; some features may be enlarged or reduced to show details of particular components. The specific structural and functional details disclosed should not be interpreted as limiting, but merely as a representative basis for teaching those skilled in the art to implement the invention in various forms. It should be understood by those skilled in the art that the multiple features illustrated and described with reference to any one of the figures may be combined with features illustrated in one or more other figures to form embodiments that are not explicitly illustrated or described. The illustrated combined features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used for specific applications or implementations as needed.

[0060] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for machining a clutch outer hub gear assembly, wherein the outer hub gear assembly comprises an outer hub, an outer hub seat, and a gear assembled together in sequence, characterized in that: The processing method comprises the following steps: Determine the positioning reference and clamping, locate the hub seat large end face and gear, and clamp the positioning position; Rough turning the inner hole of the outer hub and the inner hole of the outer hub small end. The inner hole of the outer hub and the inner hole of the outer hub small end are reverse steps. First, rough turn the φ52mm inner hole of the outer hub, and then rough turn the φ42mm inner hole of the outer hub small end. Grind the inner hole, fine-grind the inner hole of the outer hub and the inner hole of the small end of the outer hub to ensure the roughness and cylindricity of the inner hole; Cut a large groove on the outer hub and cut out the sealing oil groove on the outer hub; Cut a small groove on the outer hub and a groove for the outer hub ring; Turn the outer circle of the outer hub seat, and then finish turn the outer circle of the outer hub seat to ensure the coaxiality of the AB datum and the outer circle as well as the cylindricity of the outer circle. The technical definition of the AB datum is: A datum, the φ42mm inner hole of the outer hub seat; B datum, the φ52mm inner hole of the outer hub seat; Turn the bottom surface and inner hole of the outer hub, and precision turn the bottom surface of the outer hub and the φ103.2mm inner hole of the outer hub to ensure the roundness of the inner hole of the outer hub and the coaxiality with the AB reference; Cut the outer hub groove and the outer hub retaining ring groove.

2. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: During the processing steps of the inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat, the fine grinding allowance is ensured to be 0.03 mm per side.

3. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: In the step of cutting the large groove of the outer hub seat, the sealing oil groove of the outer hub seat is a 4mm sealing oil seal, and a 3mm pre-groove is cut first and then fine processing is performed.

4. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: The outer circle dimensions of the outer hub seat are φ47 mm and φ52.68 mm, and the outer hub seat is formed by turning in one step, with a turning allowance of 0.12 mm on one side.

5. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: In the outer hub inner hole processing step, it is directly turned into shape, and a turning allowance of 0.15mm is left on one side.

6. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: The hub seat large end face and gear positioning are specifically based on the φ42mm inner hole A and the φ52mm inner hole B, positioned with the gear center, centered with the gear pitch circle, and centered and clamped with a pitch circle fixture, wherein the positioning end face is provided with an airtight detection and end face clamping mechanism.

7. The clutch outer hub gear assembly processing method according to claim 1, characterized in that: In the step of rough turning the inner hole of the outer hub seat and the inner hole of the small end of the outer hub seat, a φ36mm inner hole is also provided at the mouth of the outer hub seat, and a special tool is required to open the φ36mm inner hole before rough turning operation; during the fine grinding process, a special tool is also used to open the φ36mm inner hole of the grinding rod, and the diameter of the grinding wheel during the fine grinding process needs to be less than 35mm. The grinding wheel is a split T-type grinding wheel, and the CBN material grinding wheel grit size:

80.

8. The clutch outer hub gear assembly machining method according to claim 1, characterized in that: The parameters for grinding the inner hole are: grinding parameters: grinding wheel linear speed 3000 mm / s; rough grinding: residual amount 0.1 mm, feed speed: 0.8 mm / min; semi-fine grinding: residual amount 0.02 mm, feed speed 0.5 mm / min; fine grinding: residual amount 0.008 mm, feed speed: 0.04 mm / min.

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