A new energy vehicle planetary carrier riveting tool

Abstract

The present application belongs to the technical field of reducer assembly, and discloses a new energy vehicle planetary carrier riveting tool. The tool comprises a base, a lower pressing head assembly fixed on the base, and an upper pressing head assembly coaxially arranged with the lower pressing head assembly; the upper pressing head assembly comprises an upper pressing plate, a central upper pressing head, a plurality of upper riveting pins, and an upper bushing; the lower pressing head assembly comprises a support plate, a central positioning block, a plurality of lower riveting pins, and a lower bushing; the positioning block is provided with a matching hole in the center for matching with the upper pressing head, and the end face of the matching hole is provided with a guide chamfer; the upper and lower riveting pins are arranged one by one in correspondence; the upper and lower bushings are internally slidably matched with the same positioning pin for circumferential positioning. The end of the upper riveting pin is a 90° double blade opening, and the end of the lower riveting pin is a 60° cross four blade opening. The present application realizes one-time synchronous riveting of the planetary carrier pin shaft on both sides, greatly improves the riveting efficiency and consistency, and eliminates the dependence on the skill proficiency of manual work.

Description

Technical Field

[0001] This invention belongs to the field of speed reducer manufacturing and assembly technology, specifically relating to a planetary carrier riveting tool for new energy vehicles. Background Technology

[0002] In the assembly process of planetary reducers, the riveting and fixing of the planetary carrier and the planetary gear shaft is a critical and challenging technological step. For example... Figure 1 As shown, in a typical planetary carrier assembly structure, there are usually six planetary gear shafts, and the upper and lower end faces of each gear shaft need to be riveted and fixed. There are a total of 12 riveting points in the entire planetary carrier assembly.

[0003] For the riveting of the aforementioned planetary gear shafts, the industry currently widely adopts the traditional single-sided, single-shaft riveting method. The specific operational procedure is as follows: First, the planetary carrier assembly is placed on the riveting equipment, and the riveting points on one side are riveted one by one; after all the riveting on one side is completed, the planetary carrier assembly is flipped over manually or with the aid of equipment; finally, the riveting points on the other side are riveted one by one. In actual production, the riveting quality and consistency mainly rely on the skill and experience of the assembly operators for control.

[0004] The existing riveting methods described above have the following main problems and defects in practical applications: 1. Low production efficiency: The single-point, single-sided riveting method, with the added step of flipping, is cumbersome and has a long processing cycle per piece, severely limiting the production pace and making it difficult to meet the requirements of efficient mass production; 2. Poor consistency in riveting quality: Since the 12 riveting points are pressed in stages and on different surfaces, it is difficult to maintain absolute uniformity in the stress state and deformation of each riveting point during the forming process, resulting in significant differences in riveting strength and flanging quality between different riveting points; 3. High susceptibility to human factors: The riveting effect is highly dependent on the skill and experience of the assembly operator, resulting in poor operational stability and difficulty in ensuring stable product quality.

[0005] Therefore, how to develop a tool and method that can achieve simultaneous riveting of planetary gear shafts on both sides in one go, while significantly improving riveting efficiency and ensuring consistent quality, and eliminating the influence of human skill proficiency on riveting quality, is a key technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a planetary carrier riveting tool for new energy vehicles, so as to solve the problems of low efficiency, poor consistency and quality that are seriously affected by the skill level of the operator when using single-sided riveting of planetary gear shafts in the prior art, and to realize double-sided one-time stamping riveting of planetary carrier pin shafts.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A planetary carrier riveting tool for new energy vehicles includes a base, a lower pressure head assembly fixed to the base, and an upper pressure head assembly coaxially arranged with the lower pressure head assembly. A riveting space for accommodating the planetary carrier assembly to be riveted is formed between the upper pressure head assembly and the lower pressure head assembly. The upper pressure head assembly includes an upper pressure plate, an upper pressure head connected to the center of the upper pressure plate, a plurality of upper riveting pins disposed on the upper pressure plate, and an upper bushing embedded in the upper pressure plate. The lower pressure head assembly includes a support plate, a positioning block coaxially disposed on the support plate, a plurality of lower riveting pins fixed to the support plate, and a lower bushing embedded in the support plate. The positioning block has a mating hole at its center that mates with the upper pressure head. The lower riveting pins and upper riveting pins are arranged in a one-to-one correspondence. The lower bushing and upper bushing are positionally corresponding, and both have the same positioning pin slidingly engaged internally.

[0008] Furthermore, the end face of the mating hole is chamfered.

[0009] Furthermore, the chamfer angle is 15°.

[0010] Furthermore, the outer peripheral surface of the positioning block is provided with at least two positioning keys arranged along its axial direction.

[0011] Furthermore, a limit block is coaxially arranged on the end face of the positioning block.

[0012] Furthermore, the end of the upper rivet pin is provided with two cutting edges, and the cutting angle between the two cutting edges is 90°.

[0013] Furthermore, the end of the lower rivet pin is provided with four cutting edges, which are distributed in a cross shape and have a cutting angle of 60°.

[0014] Furthermore, the limiting block (34) is stepped shaft-shaped, and the small diameter shaft segment of the limiting block corresponds to the diameter of the mating hole.

[0015] Furthermore, both the upper and lower riveting pins are made of W6Mo5Cr4V2 high-speed steel.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By arranging the upper and lower pressure head assemblies coaxially, and utilizing the one-to-one correspondence between the upper and lower riveting pins, and cooperating with the positioning pins inserted in the upper and lower bushings for circumferential alignment, the present invention can simultaneously complete the riveting of all riveting points on both sides of the planetary carrier pin shaft in one pressing action, without the need for flipping, eliminating the influence of manual skill, and ensuring the consistency of mass production.

[0017] This invention enables the upper pressure head to achieve high-precision axial alignment with the lower pressure head assembly when it descends by setting a mating hole in the center of the positioning block and introducing a chamfer (preferably 15° chamfer); combined with the positioning key on the outer periphery of the positioning block, it can quickly align the spline or notch of the planetary carrier assembly, ensuring accurate circumferential positioning.

[0018] The positioning block of the present invention has a limiting block coaxially arranged on the end face of the positioning block, which can accurately limit the axial movement of the planetary carrier assembly, ensure the uniformity of the riveting depth, and prevent excessive pressure from damaging the workpiece.

[0019] The upper riveting pin of this invention adopts a double-edged structure with a 90° blade, and the lower riveting pin adopts a cross-shaped four-edged structure with a 60° blade. The blades are designed specifically for the different deformation requirements of the upper and lower ends. During riveting, the material is squeezed and flows reasonably, and the flange is flat and crack-free.

[0020] The upper and lower rivet pins of this invention are both made of W6Mo5Cr4V2 high-speed steel, which has extremely high hardness, wear resistance and excellent impact resistance, and can withstand frequent impact loads, significantly extending the service life of the tooling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planetary carrier assembly to be riveted. Figure 2 This is a schematic diagram of the overall structure of the planetary carrier riveting tool for new energy vehicles according to the present invention; Figure 3 This is a schematic diagram of the upper pressure head assembly in this invention; Figure 4 This is a schematic diagram of the upper riveting pin in this invention; Figure 5 This is a schematic diagram of the lower pressure head assembly in this invention; Figure 6 This is a schematic diagram of the lower riveting pin in this invention; Figure 7 This is a schematic diagram of the riveting tool in the pre-alignment state in this invention; Figure 8 This is a schematic diagram of the riveting tool after alignment in this invention; Figure 9 This is a cross-sectional view of the planetary carrier assembly in which the riveting tool is placed, according to the present invention. Figure 10 This is a schematic diagram of the working state of the riveting tool in this invention; Figure 11 This is a schematic diagram of the actual state of the riveting tool in this invention.

[0022] Explanation of reference numerals in the attached figures: 1-Upper pressure head assembly; 11-Upper pressure plate; 12-Upper riveting pin; 13-Upper bushing; 14-Positioning pin; 15-Upper pressure head; 2- Planetary carrier assembly; 3- Lower pressure head assembly; 31- Support plate; 32- Positioning block; 33- Positioning key; 34- Limit block; 35- Lower riveting pin; 36- Lower bushing; 4-Base. Detailed Implementation

[0023] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] See Figures 1 to 7 This embodiment provides a planetary carrier riveting tool for new energy vehicles, which is specifically used to realize the one-time synchronous stamping and riveting of multiple (e.g., six) planetary gear shafts on both the upper and lower sides (a total of 12 points) in the planetary carrier assembly 2.

[0025] like Figure 2 As shown, the planetary carrier riveting tool for new energy vehicles mainly includes a base 4, a lower pressure head assembly 3 fixedly installed on the top surface of the base 4, and an upper pressure head assembly 1 arranged above the lower pressure head assembly 3 and coaxially with the lower pressure head assembly 3. During riveting operations, a riveting space is formed between the upper pressure head assembly 1 and the lower pressure head assembly 3 to accommodate the planetary carrier assembly 2 to be riveted.

[0026] Combination Figure 3 The upper pressure head assembly 1 includes a horizontally arranged upper pressure plate 11, with a vertically downward upper pressure head 15 fixedly connected to the center of the bottom surface of the upper pressure plate 11. Multiple vertically downward upper riveting pins 12 are fixedly arranged circumferentially on the upper pressure plate 11, and the number and distribution of the upper riveting pins 12 correspond one-to-one with the riveting points on the top surface of the planetary carrier assembly 2. An upper bushing 13 is also embedded in the upper pressure plate 11, and a positioning pin 14 is slidably fitted inside the upper bushing 13. The central axis of the positioning pin 14, the central axis of the upper bushing 13, and the central axis of the upper pressure plate 11 are parallel to each other.

[0027] like Figure 4 As shown, the upper rivet pin 12 is made of W6Mo5Cr4V2 high-speed steel, which has extremely high hardness, wear resistance and impact toughness. The bottom working surface of the upper rivet pin 12 has two symmetrically sharpened cutting edges, and the cutting angle between the two cutting edges is 90°, which is used to press and fold the rivet hole at the top of the planetary gear shaft.

[0028] Combination Figure 5The lower pressure head assembly 3 includes a support plate 31 fixed to the base 4. A positioning block 32 for center positioning of the planetary carrier assembly 2 is coaxially fixed to the center of the top surface of the support plate 31. The positioning block 32 has a mating hole at its center that mates with the upper pressure head 15. The upper end face of the mating hole has a 15° guide chamfer to provide high-precision axial alignment guidance when the upper pressure head 15 moves downward.

[0029] At least two (preferably two) positioning keys 33 are fixedly provided axially on the outer peripheral surface of the positioning block 32 for engaging with the spline notch inside the planetary carrier assembly 2 to achieve circumferential positioning. A detachable limiting block 34 is also coaxially mounted on the top surface of the positioning block 32 for limiting the axial height of the planetary carrier assembly 2.

[0030] Multiple vertically upward lower riveting pins 35 are fixedly mounted on the support plate 31. The lower riveting pins 35 correspond one-to-one with the upper riveting pins 12 and are arranged coaxially. A lower bushing 36 is also embedded in the support plate 31. The position of the lower bushing 36 corresponds vertically to that of the upper bushing 13. The positioning pin 14 can slide into both the upper bushing 13 and the lower bushing 36 at the same time for precise circumferential alignment of the riveting tool when it is assembled on the press.

[0031] like Figure 6 As shown, the lower rivet pin 35 is also made of W6Mo5Cr4V2 high-speed steel. The top working surface of the lower rivet pin 35 has four cutting edges distributed in a "cross" shape, and the cutting angle of each cutting edge is 60°, which can provide strong local extrusion flow forming for the rivet point at the bottom of the planetary gear shaft.

[0032] refer to Figure 7-11 The working process and operating principle of this invention are as follows: Step 1: Fix the upper pressure head assembly 1 to the sliding block of the press via the upper pressure plate 11; place the base 4 and the lower pressure head assembly 3 flat on the worktable of the press (do not tighten the bolts yet).

[0033] Step 2: Remove the limit block 34, control the press slide to move downwards, so that the upper pressure head 15 is inserted into the mating hole in the center of the positioning block 32, and use a 15° chamfer to achieve precise axial alignment of the upper and lower pressure head assemblies.

[0034] Step 3: Pass the positioning pin 14 through the upper bushing 13 and the lower bushing 36 in sequence to achieve circumferential alignment; after confirming that the alignment is correct, use the pressure plate to lock and fix the base 4.

[0035] Step 4: Control the press slide to rise and pull out the positioning pin 14.

[0036] Step 5: Place the planetary carrier assembly 2 (containing the pin to be riveted) with the inner spline facing upward on the positioning block 32, adjust the angle so that the notch of the planetary carrier is aligned with the positioning key 33 and falls into place.

[0037] Step 6: Put the limiting block 34 back in and fix it to the top of the positioning block 32.

[0038] Step 7: Start the press. The slider drives the upper pressure head assembly 1 downward. The upper pressure head 15 enters the mating hole. At the same time, the upper riveting pin 12 and the lower riveting pin 35 contact the riveting end of the planetary gear shaft from the top and bottom surfaces, respectively.

[0039] Step 8: Under the action of the press, the upper riveting pin 12 with a 90° blade and the lower riveting pin 35 with a 60° cross blade simultaneously press and fold the 12 riveting points on both sides of the six pin shafts, completing the double-sided riveting in one go.

[0040] Step 9: After riveting is completed, the slider returns to its original position and rises, allowing you to remove the riveted planetary carrier assembly.

[0041] This invention features a compact structure and extremely precise positioning, completely changing the inefficient traditional single-sided riveting method and significantly improving product consistency and production efficiency.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A planetary carrier riveting tool for new energy vehicles, characterized in that, The assembly includes a base (4), a lower pressure head assembly (3) fixed to the base (4), and an upper pressure head assembly (1) coaxially arranged with the lower pressure head assembly (3); a riveting space is formed between the upper pressure head assembly (1) and the lower pressure head assembly (3) for accommodating the planetary carrier assembly (2) to be riveted; the upper pressure head assembly (1) includes an upper pressure plate (11), an upper pressure head (15) connected to the center of the upper pressure plate (11), a plurality of upper riveting pins (12) disposed on the upper pressure plate (11), and an upper bushing (13) embedded in the upper pressure plate (11); The lower pressure head assembly (3) includes a support plate (31), a positioning block (32) coaxially disposed on the support plate (31), a plurality of lower riveting pins (35) fixed on the support plate (31), and a lower bushing (36) embedded on the support plate (31); the center of the positioning block (32) is provided with a mating hole that cooperates with the upper pressure head (15); the lower riveting pins (35) and the upper riveting pins (12) are arranged in a one-to-one correspondence; the lower bushing (36) and the upper bushing (13) are positioned in a corresponding manner, and the two are slidably fitted with the same positioning pin (14).

2. The planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: The end face of the mating hole is chamfered.

3. The planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: The outer peripheral surface of the positioning block (32) is provided with at least two positioning keys (33) arranged along its axial direction.

4. The planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: A limit block (34) is also coaxially arranged on the end face of the positioning block (32).

5. A planetary carrier riveting tool for new energy vehicles according to claim 2, characterized in that: The chamfer angle of the end face of the mating hole is 15°.

6. The planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: The end of the upper rivet pin (12) is provided with two cutting edges, and the cutting angle between the two cutting edges is 90°.

7. The planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: The end of the lower rivet pin (35) is provided with four cutting edges, which are arranged in a cross shape and have a cutting angle of 60°.

8. A planetary carrier riveting tool for new energy vehicles according to claim 4, characterized in that: The limiting block (34) is a stepped shaft, and the small diameter shaft segment of the limiting block (34) corresponds to the diameter of the mating hole.

9. A planetary carrier riveting tool for new energy vehicles according to claim 1, characterized in that: The upper riveting pin (12) and the lower riveting pin (35) are both made of W6Mo5Cr4V2 high-speed steel.

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