A distributed electric drive planetary carrier machining process

Abstract

The application provides a distributed electric drive planet carrier, which comprises a connecting shaft, a planet carrier plate and a planet support; the connecting shaft is an integral structure, comprising a middle cylinder part and an outer ring part; the outer ring part is arranged on the outer wall of the middle cylinder part; the planet carrier plate is in a ring structure and is arranged outside the connecting shaft; the inner wall of the planet carrier plate is welded with the outer wall of the outer ring part to form an integral one; the planet support comprises a planet chassis and planet side walls; three uniformly arranged planet side walls are perpendicularly arranged at the edges of the planet chassis to form an integral structure; the planet side walls are welded with the edges of the planet carrier plate to form an integral distributed electric drive planet carrier. The application can complete high-precision machining of the distributed electric drive planet carrier and improve the quality of the planet carrier.

Description

Technical Field

[0001] This invention belongs to the field of planetary carrier manufacturing, and in particular relates to a distributed electric drive planetary carrier manufacturing process. Background Technology

[0002] Distributed planetary carriers are key components of high-precision transmission systems in new energy, wind power, aerospace and other fields. They have high requirements for the accuracy of parameters such as coaxiality and roundness, so precision turning is quite difficult. How to fix the parts during machining and how to achieve high-precision machining are problems that need to be solved. Summary of the Invention

[0003] In view of this, the present invention aims to propose a distributed electric drive planetary carrier machining process to achieve high-precision machining of distributed electric drive planetary carriers.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A distributed electric drive planetary carrier includes a connecting shaft, a planetary carrier plate, and a planetary support.

[0006] The connecting shaft is an integral structure, including a middle cylinder and an outer ring. The outer ring is located on the outer wall of the middle cylinder, and the planetary carrier plate is an annular structure located outside the connecting shaft. The inner wall of the planetary carrier plate is welded to the outer wall of the outer ring to form a whole.

[0007] The planetary support includes a planetary base and planetary sidewalls. Three evenly spaced planetary sidewalls are vertically arranged at the edge of the planetary base to form an integral structure. The planetary sidewalls are then welded to the edge of the planetary support plate to form an integral distributed electric drive planetary support.

[0008] Furthermore, an inner cavity is formed in the middle of the distributed electric-driven planet;

[0009] The surface of the planetary carrier plate located outside the inner cavity is called the end face of carrier plate a, and the surface located inside the inner cavity is called the end face of carrier plate b.

[0010] The surface of the planetary support located outside the inner cavity is designated as support end face a, and the surface located inside the inner cavity is designated as support end face b.

[0011] The connecting shaft has an inner hole at one end of the inner cavity for assembling the plugging piece; the other end of the connecting shaft has a stepped structure, and the surface where the stepped structure is located serves as reference A.

[0012] The planetary support has a through hole in the middle of the support a end face, and the edge of the through hole is formed by an outward turn. The area between the planetary base and the outward turn is used as reference B.

[0013] The surfaces of the planetary carrier plate and the planetary support are respectively provided with coaxial pin holes.

[0014] A manufacturing process for a distributed electric planetary carrier.

[0015] Includes the following steps:

[0016] S1. One-time welding: Welding between the connecting shaft and the planetary carrier plate to form a single unit;

[0017] S2, First precision machining; precision machining of surface b of the planetary carrier plate in integral type I; precision machining of the inner hole of the connecting shaft;

[0018] S3, Secondary precision machining; Precision machining of surface a of the frame plate of the planetary assembly in the whole;

[0019] S4. Milling the contour; Milling the contour of the integral piece and the weld seams;

[0020] S5. Secondary welding: The planetary carrier is welded to the main body to form an integral distributed electric drive planetary carrier.

[0021] S6. Three-stage precision turning: Position the connecting shaft, precision turn the end face of the planetary support bracket a; precision turn the datum B; precision turn the inner stop of the end face of the support bracket a, which is used to assist in drilling and boring the pin hole;

[0022] S7, Fourth precision turning; Positioning the connecting shaft, precision turning the a-end face of the planetary carrier plate, precision turning the datum A; The inner stop of the a-end face of the carrier plate is used to assist in drilling and boring the pin hole;

[0023] S8. Grinding the outer diameter; machining the outer diameter of the distributed electric drive planetary carrier;

[0024] S9. Drilling and boring: Drilling and boring the reserved inner stop positions of the planetary carrier plate and planetary support.

[0025] Furthermore, in step S1, welding fixtures are used for fixed auxiliary welding; the welding depth is 4mm, laser welding is used, and it is completed in three stages: spot welding, sealing welding, and final welding.

[0026] The welding fixture features a double-sided clamping design to prevent deformation, effectively controlling the taper of the planetary carrier plate to within 0.1.

[0027] The welding fixture includes a welding base, a welding positioning plate, a first pressure cap, and a second pressure cap; the welding base has a welding positioning shaft in the middle, which is used to position the connecting shaft; the welding positioning plate is fixedly installed on the welding base, and is used to support the connecting shaft and the planetary carrier; the first pressure cap is sleeved onto the welding positioning shaft and can press the connecting shaft; the second pressure cap is connected to the welding positioning plate and can press the planetary carrier plate.

[0028] Furthermore, the top of the welding positioning shaft is also provided with a positioning fixing bolt; when the connecting shaft is sleeved onto the welding positioning shaft, the outer ring of the connecting shaft rests on the upper end face of the welding positioning plate;

[0029] The first pressure cap is sleeved onto the top of the connecting shaft, and the lower end face of the first pressure rod cooperates with the upper end face of the welding positioning plate to press the outer ring.

[0030] The positioning and fixing bolts pass through the connecting shaft and the first pressure plate in sequence; by screwing the nut into the positioning and fixing bolts, the first pressure plate can be fastened to the connecting shaft.

[0031] The welding positioning plate is connected to the welding base by bolts. The upper surface of the welding positioning plate is a flat structure, and the planetary carrier plate is placed on the welding positioning plate.

[0032] The lower part of the second pressure cap is provided with internal threads, and the upper circumferential surface of the welding positioning plate is provided with external threads. The second pressure cap and the welding positioning plate can be threadedly connected, and the second pressure cap can press the planetary carrier plate set on the welding positioning plate.

[0033] The inner lower surface of the second pressure cap is provided with a pressing protrusion for contacting the planetary carrier plate;

[0034] There is a gap between the No. 1 and No. 2 pressure caps, which corresponds to the weld between the connecting shaft and the planetary carrier plate; the welding positioning plate is provided with a clearance groove at the position corresponding to the weld.

[0035] Furthermore, in step S2, a precision turning tooling auxiliary machining platform is used to complete the precision turning operation; wherein the precision turning tooling includes a precision turning base, a fixing component, a precision turning positioning plate, and a floating plate; the precision turning base has a precision turning positioning shaft in the middle for positioning the connecting shaft of the distributed planetary carrier; the precision turning positioning plate is sleeved onto the middle of the precision turning base and is fixedly connected to the precision turning base; a fixing component is provided between the precision turning base and the precision turning positioning plate for fixing the connecting shaft and the precision turning positioning shaft; the floating plate is sleeved onto the precision turning positioning plate, and the floating plate and precision turning positioning plate assembly also has an elastic component;

[0036] The fixing assembly includes a sliding sleeve, a expanding sleeve, and a pull rod; the center of the precision machining base is provided with a positioning protrusion for inserting the precision machining positioning plate; a sliding area is provided between the positioning protrusion and the precision machining positioning shaft, and a sliding sleeve is provided in the sliding area; the pull rod is located at the tail end of the precision machining base, and the expanding sleeve is located at the other end; the sliding sleeve, the expanding sleeve, and the pull rod are fixed by bolt connection.

[0037] Furthermore, the precision machining positioning shaft is provided with a limiting step, the expansion sleeve is adjusted to the precision machining positioning shaft, and the limiting step can limit the expansion sleeve;

[0038] The end of the precision machining positioning shaft has a tapered structure, and the inner side of the top of the expansion sleeve matches the end of the positioning post; the outer side of the expansion sleeve matches the inner side of the connecting shaft; pulling the expansion sleeve can achieve relative fixation between the connecting shaft and the precision machining positioning shaft.

[0039] The end of the precision machining positioning plate is used to abut against the connecting shaft; the first end of the floating plate is sleeved onto the precision machining positioning plate, and the second end is used to support the connecting frame plate of the distributed planetary carrier;

[0040] The elastic component includes an elastic bolt and a spring body; the elastic bolt passes through the precision machining positioning plate and is connected to the floating plate;

[0041] The precision machining positioning plate is provided with a first spring groove, the floating plate is provided with a second spring groove, and the spring body is disposed between the first spring groove and the second spring groove and is sleeved on the elastic bolt.

[0042] Furthermore, in step S3; the whole is placed upside down on the precision machining fixture, the precision machining positioning plate of the precision machining fixture is replaced with a workpiece that is adapted to the upside-down whole, and then the end face of the frame plate b is precision machined.

[0043] In step S4, the integral part is fixed by the welding fixture used in step S1, and then the outline and weld of the integral part are precision milled.

[0044] In step S5, the welding fixture in step S1 replaces the welding positioning plate with a workpiece that is compatible with the planetary support, and then positions the integral part through the positioning shaft. Then, intermittent welding is performed between the integral part and the planetary support with a welding depth of 5mm. Ensure that the width of the planetary gear in the inner cavity has a tolerance of 0.2 and the flatness and perpendicularity have a tolerance of 0.1.

[0045] In step S6, the precision machining of the distributed electric drive planetary carrier is completed using the precision machining fixture in step S3.

[0046] In step S7, the precision machining positioning plate of the precision machining fixture in step S2 is replaced with a positioning plate adapted to the planetary carrier, and then the universal precision machining positioning shaft is used to complete the fastening of the distributed electric drive planetary carrier.

[0047] Ensure that the diameter of AB datum is within a tolerance zone of 0.018, the cylindricity is 0.015, the coaxiality is 0.04, the runout of the datum of the bracket a end face and the bracket plate a end face is 0.03, and the coaxiality of the inner stop relative to the AB datum is 0.05 and the cylindricity is 0.015.

[0048] In step S8, the distributed electric drive planetary carrier is fixed by the precision machining fixture in step S7. The outer circle machined in this step is an oil cover with a cylindricity of 0.007, a roundness of 0.005, a roughness of 0.4, and a coaxiality of 0.04 relative to the AB datum.

[0049] In step S9, a drilling and boring tool is used to fix the distributed electric drive planetary carrier, ensuring that the positional accuracy between the pin hole and the AB datum is 0.05, the coaxiality of the pin hole is 0.02, and the cylindricity is 0.01; after drilling one side is completed, drilling is performed on the other side.

[0050] Furthermore, the drilling and boring fixture includes a drilling and boring base plate, a drilling and boring base, a drilling and boring positioning plate, clamping jaws, and positioning pins; the drilling and boring base is mounted to the machining platform via the drilling and boring base plate; the drilling and boring positioning plate is mounted on the drilling and boring base; a drilling and boring positioning shaft is provided in the middle of the drilling and boring base, and the drilling and boring positioning shaft is used to position the distributed planetary carrier; the drilling and boring positioning plate is used to support the distributed planetary carrier; the clamping jaws are mounted on the drilling and boring positioning plate via positioning pins, and achieve fastening of the distributed planetary carrier by cooperating with the drilling and boring positioning plate;

[0051] The drilling and boring base is provided with a limiting boss in the middle, and the drilling and boring positioning plate is provided with a limiting hole corresponding to the limiting boss in the middle.

[0052] The upper surface of the drilling and boring positioning plate is provided with three evenly distributed annular positioning walls for supporting the distributed planetary carrier.

[0053] Furthermore, the drilling and boring positioning plate is provided with a screw hole, one end of the pressure claw contacts the drilling and boring positioning plate, and the other end contacts the distributed planetary carrier. The positioning pin passes through the pressure claw and is threadedly connected to the screw hole of the drilling and boring positioning plate to realize the pressure claw pressing the distributed planetary carrier.

[0054] The pressure claw includes a horizontal plate and a vertical plate connected vertically; the horizontal plate is provided with a Y-shaped groove, which can avoid the position of the drilling hole and can also cooperate with the positioning pin;

[0055] The pressure claw has a positioning protrusion at the position where it contacts the distributed planetary carrier, and the positioning protrusion corresponds to the position of the positioning wall.

[0056] Compared with existing technologies, the distributed electric planetary carrier described in this invention has the following advantages:

[0057] (1) The distributed electric drive planetary carrier processing technology described in this invention adopts a three-stage process of “dotting → sealing welding → final welding”, controls the welding depth tolerance, applies force symmetrically with double-sided clamping fixtures, and cooperates with a tapered compensation structure to effectively suppress warping caused by welding stress release.

[0058] (2) The distributed electric drive planetary carrier processing technology described in this invention uses different tooling for different processes to fix and clamp the workpiece, further ensuring the quality of the processing technology and meeting the high-precision processing requirements; achieving high-precision positioning and assembly compatibility. Attached Figure Description

[0059] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0060] Figure 1 This is a schematic diagram of a distributed electric planetary carrier as described in an embodiment of the present invention. Figure 1 ;

[0061] Figure 2 This is a schematic diagram of a distributed electric planetary carrier as described in an embodiment of the present invention. Figure 2 ;

[0062] Figure 3 This is a cross-sectional view of the distributed electric drive planetary carrier described in an embodiment of the present invention;

[0063] Figure 4 This is a schematic diagram of the welding fixture for welding the connecting shaft and the planetary carrier plate according to an embodiment of the present invention;

[0064] Figure 5 This is a cross-sectional view of the precision machining fixture for a distributed planetary carrier as described in an embodiment of the present invention;

[0065] Figure 6 This is a schematic diagram of the expansion sleeve of the precision machining fixture described in an embodiment of the present invention;

[0066] Figure 7 This is a cross-sectional view of the drilling and boring tooling for a distributed planetary carrier as described in an embodiment of the present invention;

[0067] Figure 8 This is a schematic diagram of the drilling and boring positioning plate according to an embodiment of the present invention;

[0068] Figure 9 This is a schematic diagram of the pressure claw plate according to an embodiment of the present invention.

[0069] Figure 10 This is a cross-sectional view of the precision machining fixture in step S3 of the present invention.

[0070] Figure 11 This is a cross-sectional view of the tooling used for precision milling in step S4 of the present invention.

[0071] Figure 12 This is a cross-sectional view of the tooling used in step S5 of the present invention.

[0072] Figure 13 This is a cross-sectional view of the tooling used in step S7 of the present invention.

[0073] Explanation of reference numerals in the attached figures:

[0074] 01. Connecting shaft; 011. Middle cylinder section; 012. Outer ring section; 02. Planetary carrier plate; 03. Planetary support; 04. Pin hole;

[0075] 11. Precision machining base; 111. Precision machining positioning shaft; 112. Limiting step; 12. Fixing component; 121. Sliding sleeve; 122. Expansion sleeve; 123. Tie rod; 13. Precision machining positioning plate; 14. Floating plate; 15. Elastic component; 151. Elastic bolt; 152. Spring body;

[0076] 21. Welded base; 211. Welded positioning shaft; 212. Positioning and fixing bolt; 22. Welded positioning plate; 221. Clearance groove; 23. First pressure cap; 24. Second pressure cap; 241. Pressing protrusion; 01. Connecting shaft;

[0077] 31. Drilling and boring base plate; 32. Drilling and boring base; 321. Drilling and boring positioning shaft; 33. Drilling and boring positioning plate; 331. Positioning wall; 34. Pressure claw; 341. Horizontal plate; 342. Vertical plate; 343. Y-slot; 35. Positioning pin. Detailed Implementation

[0078] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0080] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0081] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0082] A distributed electric planetary carrier, such as Figures 1-3 As shown, it includes a connecting shaft 01, a planetary carrier plate 02, and a planetary support 03;

[0083] The connecting shaft 01 is an integral structure, including a middle cylinder 011 and an outer ring 012; the outer ring 012 is disposed on the outer wall of the middle cylinder 011, and the planetary carrier plate 02 is an annular structure disposed outside the connecting shaft 01. The inner wall of the planetary carrier plate 02 is welded to the outer wall of the outer ring 012 to form an integral whole.

[0084] The planetary support 03 includes a planetary base and planetary sidewalls. Three evenly arranged planetary sidewalls are vertically arranged at the edge of the planetary base to form an integral structure. The planetary sidewalls are then welded to the edge of the planetary support plate 02 to form an integral distributed electric drive planetary support.

[0085] Preferably, an inner cavity is formed in the middle of the distributed electric planetary structure;

[0086] The surface of the planetary carrier plate 02 located outside the inner cavity is called the end face of carrier plate a, and the surface located inside the inner cavity is called the end face of carrier plate b.

[0087] The surface of the planetary support 03 located outside the inner cavity is designated as the support a end face, and the surface located inside the inner cavity is designated as the support b end face.

[0088] The connecting shaft 01 has an inner hole at one end of the inner cavity for assembling the plugging piece; the other end of the connecting shaft 01 has a stepped structure, and the surface where the stepped structure is located serves as reference A.

[0089] The planetary support 03 has a through hole in the middle of the support a end face, and the edge of the through hole is turned outward. The area between the planetary base and the outward turn is used as reference B.

[0090] The surfaces of the planetary carrier plate 02 and the planetary support 03 are respectively provided with coaxial pin holes 04.

[0091] A manufacturing process for a distributed electric planetary carrier.

[0092] Includes the following steps:

[0093] S1. One-time welding: Welding between the connecting shaft and the planetary carrier plate to form a single unit;

[0094] S2, First precision machining; precision machining of surface b of the planetary carrier plate in integral type I; precision machining of the inner hole of the connecting shaft;

[0095] S3, Secondary precision machining; Precision machining of surface a of the frame plate of the planetary assembly in the whole;

[0096] S4. Milling the contour; Milling the contour of the integral piece and the weld seams;

[0097] S5. Secondary welding: The planetary carrier is welded to the main body to form an integral distributed electric drive planetary carrier.

[0098] S6. Three-stage precision turning: Position the connecting shaft, precision turn the end face of the planetary support bracket a; precision turn the datum B; precision turn the inner stop of the end face of the support bracket a, which is used to assist in drilling and boring the pin hole;

[0099] S7, Fourth precision turning; Positioning the connecting shaft, precision turning the a-end face of the planetary carrier plate, precision turning the datum A; The inner stop of the a-end face of the carrier plate is used to assist in drilling and boring the pin hole;

[0100] S8. Grinding the outer diameter; machining the outer diameter of the distributed electric drive planetary carrier;

[0101] S9. Drilling and boring: Drilling and boring the reserved inner stop positions of the planetary carrier plate and planetary support.

[0102] Preferably, in step S1, welding fixtures are used for fixed auxiliary welding; the welding depth is 4mm, laser welding is used, and the process is completed in three stages: spot welding, sealing welding, and final welding.

[0103] The welding fixture features a double-sided clamping design to prevent deformation, effectively controlling the taper of the planetary carrier plate to within 0.1.

[0104] like Figure 4 As shown, it includes a welding base 21, a welding positioning plate 22, a first pressure cap 23, and a second pressure cap 24;

[0105] The welding base 21 is provided with a welding positioning shaft 211 in the middle, which is used to position the connecting shaft 01.

[0106] The welding positioning plate 22 is fixedly installed on the welding base 21, and the welding positioning plate 22 is used to support the connecting shaft 01 and the planetary carrier;

[0107] The first pressure cap 23 is sleeved onto the welding positioning shaft 211 and can press the connecting shaft 01 tightly;

[0108] The second pressure cap 24 is connected to the welding positioning plate 22 and can press the planetary carrier plate 02.

[0109] Preferably, the top of the welding positioning shaft 211 is further provided with a positioning fixing bolt 212; when the connecting shaft 01 is sleeved onto the welding positioning shaft 211, the outer ring of the connecting shaft 01 rests on the upper end face of the welding positioning plate 22.

[0110] The first pressure cap 23 is sleeved onto the top of the connecting shaft 01, and the lower end face of the first pressure rod cooperates with the upper end face of the welding positioning plate 22 to achieve the pressing of the outer ring.

[0111] Preferably, the positioning and fixing bolt 212 passes through the connecting shaft 01 and the first pressure cover 23 in sequence; by screwing the nut into the positioning and fixing bolt 212, the first pressure cover 23 can be fastened to the connecting shaft 01.

[0112] Preferably, the welding positioning plate 22 is connected to the welding base 21 by bolts, the upper end surface of the welding positioning plate 22 is a planar structure, and the planetary carrier plate 02 is placed on the welding positioning plate 22;

[0113] The lower part of the second pressure cap 24 is provided with internal threads, and the upper circumferential surface of the welding positioning plate 22 is provided with external threads. The second pressure cap 24 and the welding positioning plate 22 can be threadedly connected, and the second pressure cap 24 can press the planetary carrier plate 02 set on the welding positioning plate 22.

[0114] Preferably, the inner lower surface of the second pressure cover 24 is provided with a pressing protrusion 241 for contacting the planetary carrier plate 02.

[0115] Preferably, there is a gap between the first pressure cap 23 and the second pressure cap 24, which corresponds to the weld between the connecting shaft 01 and the planetary carrier plate 02; the welding positioning plate 22 is provided with an avoidance groove 221 at the position corresponding to the weld.

[0116] Preferably, the outer circumferential surface of the second pressure cap 24 is provided with a rotating bolt to assist the rotation of this tooling.

[0117] The working principle is as follows: First, the connecting shaft 01 is sleeved onto the welding base 21, and then the connecting shaft 01 is pressed by the first pressure cap 23; then the planetary carrier plate 02 is placed, and then the planetary carrier plate 02 is pressed by the second pressure cap 24. After all is fixed, the connecting shaft 01 and the planetary carrier plate 02 are welded.

[0118] Preferably, in step S2, the precision turning operation is completed using a precision turning tooling auxiliary machining platform; such as... Figure 5 and Figure 6 As shown; the precision machining fixture includes a precision machining base 11, a fixing component 12, a precision machining positioning plate 13, and a floating plate 14;

[0119] The precision machining base 11 is mounted on the machining platform, and the machining platform also has a drive structure for connecting with the pull rod 123 to complete the drive of the pull rod 123;

[0120] The precision machining base 11 is provided with a precision machining positioning shaft 111 in the middle, which is used to position the connecting shaft of the distributed planetary carrier.

[0121] The precision machining positioning plate 13 is sleeved onto the middle part of the precision machining base 11 and is fixedly connected to the precision machining base 11;

[0122] A fixing component 12 is provided between the precision machining base 11 and the precision machining positioning plate 13; used to fix the connecting shaft and the precision machining positioning shaft 111.

[0123] The floating disk 14 is sleeved onto the precision machining positioning disk 13, and the floating disk 14 and precision machining positioning disk 13 assembly is also provided with an elastic component 15.

[0124] Preferably, the fixing component 12 includes a sliding sleeve 121, a stretching sleeve 122, and a pull rod 123;

[0125] The center of the precision machining base 11 is provided with a positioning protrusion for inserting the precision machining positioning plate 13.

[0126] A sliding area is provided between the positioning protrusion and the precision machining positioning shaft 111. The sliding area is provided with a sliding sleeve 121. The pull rod 123 is provided at the tail end of the precision machining base 11, and the expansion sleeve 122 is provided at the other end. The sliding sleeve 121, the expansion sleeve 122 and the pull rod 123 are fixed by bolt connection.

[0127] Preferably, the precision machining positioning shaft 111 is provided with a limiting step 112, the expansion sleeve 122 is adjusted to the precision machining positioning shaft 111, and the limiting step 112 can limit the expansion sleeve 122.

[0128] Preferably, the end of the precision machining positioning shaft 111 has a tapered structure, and the inner side of the top end of the expansion sleeve 122 matches the end of the positioning post.

[0129] The outer side of the expansion sleeve 122 fits into the inner side of the connecting shaft; pulling the expansion sleeve 122 can achieve relative fixation between the connecting shaft and the precision machining positioning shaft 111.

[0130] Preferably, the end of the precision machining positioning plate 13 is used to abut against the connecting shaft; the first end of the floating plate 14 is sleeved onto the precision machining positioning plate 13, and the second end is used to support the connecting frame plate of the distributed planetary carrier.

[0131] Preferably, the elastic component 15 includes an elastic bolt 151 and a spring body 152; the elastic bolt 151 passes through the precision machining positioning plate 13 and is connected to the floating plate 14;

[0132] The precision machining positioning plate 13 is provided with a first spring groove, the floating plate 14 is provided with a second spring groove, and the spring body 152 is disposed between the first spring groove and the second spring groove and is sleeved on the elastic bolt 151. Under the action of the elastic component 15, the precision machining positioning plate 13 always provides force to the planetary carrier, reducing vibration and deformation during machining.

[0133] The working principle is as follows: the distributed planetary carrier is sleeved onto the expansion sleeve 122. At this time, the expansion sleeve 122 is in its initial position, and the distributed planetary carrier and the expansion sleeve 122 make initial contact. At the same time, the end face of the floating disk 14 forms support for the distributed planetary carrier. During processing, the drive mechanism pulls the tie rod 123, and the expansion sleeve 122 moves down to fill the space between the distributed planetary carrier and the precision turning positioning shaft 111. As the expansion sleeve 122 moves down, the planetary carrier and the precision turning positioning shaft 111 become more and more fixed. Then, the distributed planetary carrier is precision turned by a precision turning device. During the processing, the floating disk 14 will float to assist in positioning the planetary carrier, reducing vibration and deformation during processing.

[0134] Preferably, in step S3; the entire assembly is inverted and fixed onto the precision machining fixture, or the precision machining positioning plate of the precision machining fixture is replaced with a workpiece adapted to the inverted assembly, and then the end face of the support plate b is precision machined; such as Figure 10 As shown;

[0135] In step S4; the integral component is fixed using the welding fixture used in step S1, and then the outline and weld of the integral component are precision milled; or the integral component is fixed using a workpiece that can be adapted to it, such as... Figure 11 As shown;

[0136] In step S5, welding is performed using the welding fixture from step S1, or the welding positioning plate of the welding fixture is replaced with a workpiece adapted to the planetary support. Then, the integral piece is positioned using the positioning shaft, followed by intermittent welding between the integral piece and the planetary support, with a welding depth of 5mm. The tolerance zone for the width of the planetary gears in the inner cavity is 0.2mm, and the tolerances for flatness and perpendicularity are 0.1mm. Figure 12 As shown;

[0137] In step S6, the precision machining of the distributed electric drive planetary carrier is completed using the precision machining fixture in step S3.

[0138] In step S7, the precision machining fixture from step S2 is used to fasten the planetary carrier, or the precision machining positioning plate of the precision machining fixture is replaced with a positioning plate adapted to the planetary carrier, and then the universal precision machining positioning shaft is used to complete the fastening of the distributed electric drive planetary carrier; for example Figure 13 As shown;

[0139] Ensure that the diameter of AB datum is within a tolerance zone of 0.018, the cylindricity is 0.015, the coaxiality is 0.04, the runout of the datum of the bracket a end face and the bracket plate a end face is 0.03, and the coaxiality of the inner stop relative to the AB datum is 0.05 and the cylindricity is 0.015.

[0140] In step S8, the distributed electric drive planetary carrier is fixed by the precision machining fixture in step S7. The outer circle machined in this step is an oil cover with a cylindricity of 0.007, a roundness of 0.005, a roughness of 0.4, and a coaxiality of 0.04 relative to the AB datum.

[0141] In step S9, a drilling and boring tool is used to fix the distributed electric drive planetary carrier, ensuring that the positional accuracy between the pin hole and the AB datum is 0.05, the coaxiality of the pin hole is 0.02, and the cylindricity is 0.01; after drilling one side is completed, drilling is performed on the other side.

[0142] Preferred, such as Figure 7-9 As shown, the drilling and boring fixture includes a drilling and boring base plate 31, a drilling and boring base 32, a drilling and boring positioning plate 33, a clamping claw 34, and a positioning pin 35;

[0143] The boring base 32 is mounted to the machining platform via the boring base plate 31; the boring positioning plate 33 is mounted on the boring base 32.

[0144] The drilling and boring base 32 is provided with a drilling and boring positioning shaft 321 in the middle, which is used to position the distributed planetary carrier.

[0145] The drilling and boring positioning plate 33 is used to support the distributed planetary carrier; the pressure claw 34 is installed on the drilling and boring positioning plate 33 by means of the positioning pin 35, and achieves the fastening of the distributed planetary carrier by cooperating with the drilling and boring positioning plate 33.

[0146] Preferably, the drilling and boring base 32 is provided with a limiting boss in the middle, and the drilling and boring positioning plate 33 is provided with a limiting hole corresponding to the limiting boss in the middle.

[0147] The upper surface of the drilling and boring positioning disk 33 is provided with three evenly distributed annular positioning walls 331 for supporting the distributed planetary carrier.

[0148] Preferably, the drilling and boring positioning plate 33 is provided with a screw hole, one end of the pressure claw 34 contacts the drilling and boring positioning plate 33, and the other end contacts the distributed planetary carrier. The positioning pin 35 passes through the pressure claw 34 and is threadedly connected to the screw hole of the drilling and boring positioning plate 33, so as to realize the pressure claw 34 pressing the distributed planetary carrier.

[0149] Preferably, the pressure claw 34 includes a horizontal plate 341 and a vertical plate 342 connected vertically; the horizontal plate 341 is provided with a Y-shaped groove 343, which can avoid the position of the drilling hole and can also cooperate with the positioning pin 35.

[0150] Preferably, the number of pressure claws 34 is three.

[0151] Preferably, the position where the pressure claw 34 contacts the distributed planetary carrier is provided with a positioning protrusion, and the positioning protrusion corresponds to the position of the positioning wall 331.

[0152] The working principle is as follows: the distributed planetary carrier is sleeved onto the drilling and boring positioning shaft 321. At this time, the positioning wall 331 provides support for the distributed planetary carrier. The pressure claw 34 is fixed to the drilling and boring positioning plate 33 by the positioning pin 35. At the same time, the pressure claw 34 achieves the fastening of the distributed planetary carrier. Then, the drilling and boring operation is performed on the distributed planetary carrier.

[0153] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A distributed electric drive planetary carrier manufacturing process, characterized in that: A distributed electric drive planetary carrier includes a connecting shaft, a planetary carrier plate, and a planetary support. The connecting shaft is an integral structure, including a middle cylinder and an outer ring. The outer ring is located on the outer wall of the middle cylinder. The planetary carrier plate is an annular structure located outside the connecting shaft. The inner wall of the planetary carrier plate is welded to the outer wall of the outer ring to form a whole. The planetary support includes a planetary base and planetary sidewalls. Three evenly arranged planetary sidewalls are vertically arranged on the edge of the planetary base to form an integral structure. The planetary sidewalls are then welded to the edge of the planetary carrier plate to form an integral distributed electric drive planetary carrier. The distributed electric drive planetary carrier has an inner cavity in the middle; the surface of the planetary carrier plate located outside the inner cavity is the end face of the carrier plate a, and the surface located inside the inner cavity is the end face of the carrier plate b; the surface of the planetary support located outside the inner cavity is the end face of the support a, and the surface located inside the inner cavity is the end face of the support b. The connecting shaft has an inner hole at one end of the inner cavity for assembling the plugging piece; the other end of the connecting shaft has a stepped structure, and the surface where the stepped structure is located serves as reference A. The planetary support has a through hole in the middle of the support a end face, and the edge of the through hole is formed by an outward turn. The area between the planetary base and the outward turn is used as reference B. The surfaces of the planetary carrier plate and the planetary support are respectively provided with coaxial pin holes; The processing technology includes the following steps: S1. One-time welding: Welding between the connecting shaft and the planetary carrier plate to form a single unit; S2, First precision machining; precision machining of the b-end face of the planetary carrier plate in the integral type; precision machining of the inner hole of the connecting shaft; S3, Secondary precision machining; Precision machining of the end face a of the frame plate of the planetary assembly in the whole; S4. Milling the contour; Milling the contour of the integral piece and the weld seams; S5. Secondary welding: The planetary carrier is welded to the main body to form an integral distributed electric drive planetary carrier. S6. Three-stage precision turning: Position the connecting shaft, precision turn the end face of the planetary support bracket a; precision turn the datum B; precision turn the inner stop of the end face of the support bracket a, which is used to assist in drilling and boring the pin hole; S7, Fourth precision turning; Positioning the connecting shaft, precision turning the a-end face of the planetary carrier plate, precision turning the datum A; Precision turning the inner stop of the a-end face of the carrier plate, used to assist in drilling and boring the pin hole; S8. Grinding the outer diameter; machining the outer diameter of the distributed electric drive planetary carrier; S9. Drilling and boring: Drilling and boring the positions of the reserved inner stops on the planetary carrier plate and planetary support; In step S1, welding fixtures are used for fixed auxiliary welding; the welding depth is 4mm, laser welding is used, and it is completed in three stages: spot welding, sealing welding, and final welding. The welding fixture features a double-sided clamping design to prevent deformation, effectively controlling the taper of the planetary carrier plate to within 0.

1. The welding fixture includes a welding base, a welding positioning plate, a first pressure cap, and a second pressure cap; the welding base has a welding positioning shaft in the middle, which is used to position the connecting shaft; the welding positioning plate is fixedly installed on the welding base, and is used to support the connecting shaft and the planetary carrier; the first pressure cap is sleeved onto the welding positioning shaft and can press the connecting shaft; the second pressure cap is connected to the welding positioning plate and can press the planetary carrier plate. The top of the welding positioning shaft is also provided with a positioning and fixing bolt; when the connecting shaft is sleeved onto the welding positioning shaft, the outer ring of the connecting shaft rests on the upper end face of the welding positioning plate; The first pressure cap is sleeved onto the top of the connecting shaft, and the lower end face of the first pressure cap cooperates with the upper end face of the welding positioning plate to press the outer ring. The positioning and fixing bolts pass through the connecting shaft and the first pressure plate in sequence; by screwing the nut into the positioning and fixing bolts, the first pressure plate can be fastened to the connecting shaft. The welding positioning plate is connected to the welding base by bolts. The upper surface of the welding positioning plate is a flat structure, and the planetary carrier plate is placed on the welding positioning plate. The lower part of the second pressure cap is provided with internal threads, and the upper circumferential surface of the welding positioning plate is provided with external threads. The second pressure cap and the welding positioning plate can be threadedly connected, and the second pressure cap can press the planetary carrier plate set on the welding positioning plate. The inner lower surface of the second pressure cap is provided with a pressing protrusion for contacting the planetary carrier plate; There is a gap between the No. 1 and No. 2 pressure caps, which corresponds to the weld between the connecting shaft and the planetary carrier plate; the welding positioning plate is provided with a clearance groove at the position corresponding to the weld.

2. The distributed electric drive planetary carrier manufacturing process according to claim 1, characterized in that: In step S2, a precision turning tooling auxiliary machining platform is used to complete the precision turning operation; wherein the precision turning tooling includes a precision turning base, a fixing component, a precision turning positioning plate, and a floating plate; the precision turning base has a precision turning positioning shaft in the middle for positioning the connecting shaft of the distributed planetary carrier; the precision turning positioning plate is sleeved onto the middle of the precision turning base and is fixedly connected to the precision turning base; a fixing component is provided between the precision turning base and the precision turning positioning plate for fixing the connecting shaft and the precision turning positioning shaft; the floating plate is sleeved onto the precision turning positioning plate, and the floating plate and precision turning positioning plate assembly also has an elastic component; The fixing assembly includes a sliding sleeve, a expanding sleeve, and a pull rod; the center of the precision machining base is provided with a positioning protrusion for inserting the precision machining positioning plate; a sliding area is provided between the positioning protrusion and the precision machining positioning shaft, and a sliding sleeve is provided in the sliding area; the pull rod is located at the tail end of the precision machining base, and the expanding sleeve is located at the other end; the sliding sleeve, the expanding sleeve, and the pull rod are fixed by bolt connection.

3. The distributed electric drive planetary carrier manufacturing process according to claim 2, characterized in that: The precision machining positioning shaft is provided with a limiting step, the expansion sleeve is adjusted to the precision machining positioning shaft, and the limiting step can limit the expansion sleeve; The end of the precision machining positioning shaft has a tapered structure, and the inner side of the top of the expansion sleeve matches the end of the positioning post; the outer side of the expansion sleeve matches the inner side of the connecting shaft; pulling the expansion sleeve can achieve relative fixation between the connecting shaft and the precision machining positioning shaft. The end of the precision machining positioning plate is used to abut against the connecting shaft; the first end of the floating plate is sleeved onto the precision machining positioning plate, and the second end is used to support the connecting frame plate of the distributed planetary carrier; The elastic component includes an elastic bolt and a spring body; the elastic bolt passes through the precision machining positioning plate and is connected to the floating plate; The precision machining positioning plate is provided with a first spring groove, the floating plate is provided with a second spring groove, and the spring body is disposed between the first spring groove and the second spring groove and is sleeved on the elastic bolt.

4. The distributed electric drive planetary carrier manufacturing process according to claim 2, characterized in that: In step S3, the entire assembly is inverted and fixed onto the precision machining fixture, and then the end face of the frame plate b is precision machined. In step S4, the integral part is fixed by the welding fixture used in step S1, and then the outline and weld of the integral part are precision milled. In step S5, welding is performed using the welding fixture from step S1, and then the integral part is positioned using the positioning shaft. Then, intermittent welding is performed between the integral part and the planetary support, with a welding depth of 5mm. This ensures that the width of the planetary gears in the inner cavity has a tolerance of 0.2mm and the flatness and perpendicularity have a tolerance of 0.1mm. In step S6, the precision machining of the distributed electric drive planetary carrier is completed using the precision machining fixture in step S3. In step S7, the precision machining fixture from step S2 is used to fasten the distributed electric drive planetary carrier. Ensure that the diameter of AB datum is within a tolerance zone of 0.018, the cylindricity is 0.015, the coaxiality is 0.04, the runout of the datum of the bracket a end face and the bracket plate a end face is 0.03, and the coaxiality of the inner stop relative to the AB datum is 0.05 and the cylindricity is 0.

015. In step S8, the distributed electric drive planetary carrier is fixed by the precision machining fixture in step S7. The outer circle machined in this process is an oil cover with a cylindricity of 0.007, a roundness of 0.005, a roughness of 0.4, and a coaxiality of 0.04 relative to the AB datum. In step S9, a drilling and boring tool is used to fix the distributed electric drive planetary carrier, ensuring that the positional accuracy between the pin hole and the AB datum is 0.05, the coaxiality of the pin hole is 0.02, and the cylindricity is 0.01; after drilling one side is completed, drilling is performed on the other side.

5. The distributed electric drive planetary carrier manufacturing process according to claim 4, characterized in that: The drilling and boring fixture includes a drilling and boring base plate, a drilling and boring base, a drilling and boring positioning plate, clamping jaws, and positioning pins. The drilling and boring base is mounted to the machining platform via the drilling and boring base plate. The drilling and boring positioning plate is mounted on the drilling and boring base. A drilling and boring positioning shaft is provided in the middle of the drilling and boring base, which is used to position the distributed planetary carrier. The drilling and boring positioning plate is used to support the distributed planetary carrier. The clamping jaws are mounted on the drilling and boring positioning plate via positioning pins, and achieve fastening of the distributed planetary carrier by cooperating with the drilling and boring positioning plate. The drilling and boring base is provided with a limiting boss in the middle, and the drilling and boring positioning plate is provided with a limiting hole corresponding to the limiting boss in the middle. The upper surface of the drilling and boring positioning plate is provided with three evenly distributed annular positioning walls for supporting the distributed planetary carrier.

6. The distributed electric drive planetary carrier manufacturing process according to claim 5, characterized in that: The drilling and boring positioning plate is provided with screw holes. One end of the pressure claw contacts the drilling and boring positioning plate, and the other end contacts the distributed planetary carrier. The positioning pin passes through the pressure claw and is threadedly connected to the screw hole of the drilling and boring positioning plate to realize the pressure claw pressing the distributed planetary carrier. The pressure claw includes a horizontal plate and a vertical plate connected vertically; the horizontal plate is provided with a Y-shaped groove, which can avoid the position of the drilling hole and can also cooperate with the positioning pin; The pressure claw has a positioning protrusion at the position where it contacts the distributed planetary carrier, and the positioning protrusion corresponds to the position of the positioning wall.

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