Transmission auxiliary box welding shaft structure based on argon arc welding

Abstract

The utility model relates to the technical field of transmission auxiliary box welding shafts, and discloses a transmission auxiliary box welding shaft structure based on argon arc welding, an intermediate shaft transmission gear is assembled on an intermediate shaft in an interference mode, and a first welding seam is formed at the welding position between one end of the intermediate shaft transmission gear and the intermediate shaft. A second welding seam is formed at the welding position between the other end of the intermediate shaft transmission gear and the intermediate shaft, the first welding seam and the second welding seam are arranged through argon arc welding, and the welding seam shapes of the first welding seam and the second welding seam are optimized, so that the welding strength of the auxiliary box welding shaft is greatly improved; and parameters of the intermediate shaft transmission gear, the intermediate shaft and the two welding seams are optimized, so that the fatigue life of the auxiliary box welding shaft is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission auxiliary box welding shafts, in particular to a transmission auxiliary box welding shaft structure based on argon arc welding. Background Art

[0002] As high-horsepower engine technology matures, major OEMs demand high-speed ratio and high-torque transmissions to match them. The application of high-speed ratio and high-torque transmissions makes the vehicle's climbing ability and load-bearing capacity stronger. However, the fatigue strength of the auxiliary box welded shaft is one of the main problems faced by high-speed ratio and high-torque transmissions. At present, the auxiliary box welded shaft adopts carbon dioxide and argon mixed gas shielded welding, and the welded part structure adopts front-end circumferential fillet welding + rear-end circumferential semi-U-shaped welding. The above welding method and welded part structure take into account the welding equipment capacity, cost and efficiency. The maximum fatigue strength that the auxiliary box welded shaft can meet is also the most commonly used welding method and welded part structure for high-torque transmissions. However, with the high-torque transmission increasing its torque, the above welding method and welded part structure have been verified by tests to no longer meet the use requirements, and due to the limited spatial structure of the transmission, it is impossible to increase the fatigue strength of the auxiliary box welded shaft by large adjustment measures such as lengthening the welding shaft and increasing the center distance, which makes the fatigue strength of the auxiliary box welded shaft a bottleneck for the high-torque transmission to increase its torque. Utility Model Content

[0003] In order to overcome the defects of the above-mentioned prior art, the purpose of the utility model is to provide a transmission auxiliary box welding shaft structure based on argon arc welding to solve the technical problem of fatigue strength of the auxiliary box welding shaft of the high torque transmission with re-torque in the prior art.

[0004] The utility model is realized by the following technical solutions:

[0005] The utility model provides a transmission auxiliary box welding shaft structure based on argon arc welding, comprising an intermediate shaft transmission gear and an intermediate shaft, wherein the intermediate shaft transmission gear is interference fitted on the intermediate shaft, wherein a first weld is formed at a welding point between one end of the intermediate shaft transmission gear and the intermediate shaft, and a second weld is formed at a welding point between the other end of the intermediate shaft transmission gear and the intermediate shaft, and the first weld and the second weld are arranged by argon arc welding.

[0006] Preferably, the first weld is an inclined U-shaped weld in the axial direction of the intermediate shaft, wherein the diameter of the U-shaped weld of the first weld is in the range of 55 to 62 mm.

[0007] Preferably, the second weld is a semi-U-shaped weld structure between the intermediate shaft transmission gear and the intermediate shaft, wherein the depth of the second weld is in the range of 4 to 6 mm, and the weld excess height of the second weld is in the range of 0 to 2 mm.

[0008] Preferably, the two ends of the intermediate shaft transmission gear are gear tops, and the second weld is positioned at a distance from the gear top to one side of the outside of the intermediate shaft, wherein the positioning spacing ranges from 45 to 53 mm.

[0009] Preferably, the first weld is positioned on the intermediate shaft through the contact between the intermediate shaft transmission gear and the intermediate shaft, wherein the positioning spacing ranges from 5 to 7.5 mm.

[0010] Preferably, webs are provided on the inner sides of both ends of the intermediate shaft transmission gear, the thickness of the webs is in the range of 10 to 20 mm, and the webs are inclined, wherein the bevel angle range is -26° to 18.8°.

[0011] Preferably, the intermediate shaft is provided with a first pillow block, a second pillow block and a third pillow block in sequence from the outside to the inside along the axial direction; the intermediate shaft transmission gear is interference-fitted on the first pillow block and the intermediate shaft transmission gear is clearance-fitted on the second pillow block, the first weld is the gap between the intermediate shaft transmission gear and the first pillow block, and the second weld is the gap between the intermediate shaft transmission gear and the third pillow block.

[0012] Furthermore, the diameter of the first pillow block is smaller than the diameter of the second pillow block, the diameter of the second pillow block is smaller than the diameter of the third pillow block, the diameter of the first pillow block ranges from 55 to 65 mm, and the diameter of the third pillow block ranges from 76 to 82 mm.

[0013] Preferably, the interference fit between the intermediate shaft transmission gear and the intermediate shaft is in the range of 0.055 to 0.095 mm.

[0014] Preferably, the filling area of ​​the first weld is in the range of 12.5 to 27 mm 2 ; The filling area of ​​the second weld is in the range of 19.5 to 31.73 mm 2 .

[0015] Compared with the prior art, the utility model has the following beneficial technical effects:

[0016] The utility model provides a transmission auxiliary box welding shaft structure based on argon arc welding, in which an intermediate shaft transmission gear is interference fitted on the intermediate shaft, wherein a first weld is formed at a welding position between one end of the intermediate shaft transmission gear and the intermediate shaft, and a second weld is formed at a welding position between the other end of the intermediate shaft transmission gear and the intermediate shaft, wherein the first weld and the second weld are arranged by argon arc welding, and the welding strength of the auxiliary box welding shaft is greatly improved by optimizing the weld morphology of the first weld and the second weld, and the parameters of the intermediate shaft transmission gear and the intermediate shaft as well as the two welds are optimized, thereby improving the fatigue life of the auxiliary box welding shaft.

[0017] Furthermore, the first weld is an inclined U-shaped weld in the axial direction of the intermediate shaft, wherein the diameter range of the U-shaped weld of the first weld is, by optimizing the weld morphology of the first weld, the filling area of ​​the weld per unit cross section is increased, which helps to improve the strength of the first weld.

[0018] Furthermore, the second weld is a semi-U-shaped weld structure between the intermediate shaft transmission gear and the intermediate shaft, wherein the depth of the second weld ranges from 4 to 6 mm, and the weld excess height of the second weld ranges from 0 to 2 mm, which helps to reduce the stress values ​​at the weld toe and the weld root and improves the strength of the rear end weld.

[0019] Furthermore, the two ends of the intermediate shaft transmission gear are the top of the gear, and the second weld is positioned by the distance on one side of the top of the gear close to the outside of the intermediate shaft, wherein the positioning spacing range is 45 to 53 mm, and the top positioning shoulder of the intermediate shaft transmission gear moves forward, and the original vertical gap of the positioning shoulder is converted into an axial gap after welding, which greatly improves the strength of the weld.

[0020] Furthermore, webs are provided on the inner sides of both ends of the intermediate shaft transmission gear, the thickness of the webs is in the range of 10 to 20 mm, and the webs are inclined, wherein the bevel angle range is -26° to 18.8°. By inclining the webs, the first weld can bear more load and reduce the bearing pressure of the second weld, which is the weakest point.

[0021] Furthermore, the diameter of the first pillow block is smaller than that of the second pillow block, and the diameter of the second pillow block is smaller than that of the third pillow block. Under the premise of ensuring that the weld filling area per unit cross section remains unchanged, the weld filling volume of the second weld circular semi-U-shaped weld is increased, which helps to increase the bearing pressure of the second weld at the weakest point. At the same time, the diameter of the intermediate shaft at this position is increased, which also improves the torsional resistance and bending resistance at the weakest point.

[0022] Furthermore, the interference fit between the intermediate shaft transmission gear and the intermediate shaft is in the range of 0.055 to 0.095 mm, which improves the torque transmission capability of the interference fit to reduce the bearing pressure of the weld. At the same time, the increase in diameter also increases the weld filling volume of the first weld, which helps to improve the weld strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the transmission auxiliary box welding shaft structure based on argon arc welding in the utility model;

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of detail A in FIG.

[0025] Figure 3 for Figure 1 An enlarged schematic diagram of detail B in FIG.

[0026] Figure 4 This is a schematic diagram of the structural parameters of the transmission auxiliary box welding shaft in this embodiment;

[0027] In the figure: 1-intermediate shaft transmission gear; 2-intermediate shaft; 3-first weld; 4-second weld; 11-gear top; 12-web; 21-first shaft block; 22-second shaft block; 23-third shaft block. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, products or devices.

[0030] The utility model is further described in detail below with reference to the accompanying drawings:

[0031] The utility model aims to provide a transmission auxiliary box welding shaft structure based on argon arc welding to solve the technical problem of fatigue strength of auxiliary box welding shaft of high torque transmission with increased torque in the prior art.

[0032] See also Figure 1 In one embodiment of the utility model, a transmission auxiliary box welding shaft structure based on argon arc welding is provided, including an intermediate shaft transmission gear 1 and an intermediate shaft 2, wherein the intermediate shaft transmission gear 1 is interference fitted on the intermediate shaft 2, wherein a first weld 3 is formed at a welding point between one end of the intermediate shaft transmission gear 1 and the intermediate shaft 2, and a second weld 4 is formed at a welding point between the other end of the intermediate shaft transmission gear 1 and the intermediate shaft 2, and the first weld 3 and the second weld 4 are arranged by argon arc welding.

[0033] Specifically, the first weld 3 is an inclined U-shaped weld in the axial direction of the intermediate shaft 2, wherein the diameter of the U-shaped weld of the first weld 3 is 60.34. By optimizing the weld morphology of the first weld 3, the filling area of ​​the weld per unit cross-section is increased, which helps to improve the strength of the first weld 3.

[0034] Specifically, the second weld 4 is a semi-U-shaped weld structure between the intermediate shaft transmission gear 1 and the intermediate shaft 2, wherein the depth of the second weld 4 is 5 mm, and the weld excess height range of the second weld 4 is 2 mm, which helps to reduce the stress value at the weld toe and the weld root and improves the strength of the rear end weld.

[0035] Specifically, the two ends of the intermediate shaft transmission gear 1 are gear tops 11, and the second weld 4 is positioned by the gear top 11 close to the side of the outside of the intermediate shaft 2, wherein the positioning spacing is 51.2 mm. The positioning shoulder of the intermediate shaft transmission gear top moves forward, and the original vertical gap of the positioning shoulder is converted into an axial gap after welding, which greatly improves the strength of the weld.

[0036] Specifically, the first weld 4 is positioned on the intermediate shaft 2 through the contact between the intermediate shaft transmission gear 1 and the intermediate shaft 2 , wherein the positioning interval is 6.6 mm.

[0037] Specifically, webs 12 are provided on the inner sides of both ends of the intermediate shaft transmission gear 1. The thickness of the webs 12 is 15 mm. The webs 12 are tilted, and the bevel angle is 4°. The tilt of the webs 12 allows the first weld 3 to bear more load, thereby reducing the bearing pressure of the second weld 4, which is the weakest point.

[0038] Specifically, the intermediate shaft 1 is provided with a first pillow block 21, a second pillow block 22 and a third pillow block 23 in sequence from the outside to the inside along the axial direction; the intermediate shaft transmission gear 1 is interference fitted on the first pillow block 21 and the second pillow block 22, the first weld 3 is the gap between the intermediate shaft transmission gear 1 and the first pillow block 21, and the second weld 4 is the gap between the intermediate shaft transmission gear 1 and the third pillow block 23.

[0039] Specifically, the diameter of the first pillow block 21 is smaller than the diameter of the second pillow block 22, and the diameter of the second pillow block 22 is smaller than the diameter of the third pillow block 23. The diameter of the first pillow block 21 is 60.34 mm, and the diameter of the third pillow block 23 is 78.3 mm.

[0040] Among them, under the premise of ensuring that the weld filling area per unit cross-section remains unchanged, the weld filling volume of the second weld 4-circumferential semi-U-shaped weld is increased, which helps to increase the bearing pressure of the second weld at the weakest point. At the same time, the diameter of the intermediate shaft at this position is increased, which also improves the torsional and bending resistance at the weakest point.

[0041] Specifically, the interference fit between the intermediate shaft transmission gear 1 and the intermediate shaft 2 is in the range of 0.055 to 0.095 mm, which improves the torque transmission capability of the interference fit to reduce the bearing pressure of the weld. At the same time, the increase in diameter also increases the weld filling volume of the first weld, which helps to improve the weld strength.

[0042] Specifically, the filling area of ​​the first weld 3 is 26.12 mm 2 ; The filling area of ​​the second weld 4 is 20.7mm 2 .

[0043] Example

[0044] This embodiment provides a transmission auxiliary box welding shaft structure based on argon arc welding. Without changing the existing welding equipment and tooling and adjusting the welding gun angle, the first weld 3 is locally optimized to an axial 45° semi-U-shaped weld. The main parameters of the weld are: K=5mm, β1=150°, β2=12°, R=2.6mm. This weld morphology increases the fill area of ​​the weld per unit cross section by S1=26.12mm. 2 , which helps to improve the strength of the front weld;

[0045] The web 12 of the intermediate shaft transmission gear 1 is thickened and tilted forward, with the main parameters being: T = 15 mm, α = 4°, in order to allow the front weld to bear more load and reduce the bearing pressure of the rear weld at the weakest point;

[0046] Increase the matching diameter, interference, and shaft hole interference length of the intermediate shaft transmission gear 1 and the intermediate shaft 2. The main parameters are: d1 = 60.34mm, interference 0.055-0.095mm, L4 = 29.5mm. The purpose is to improve the interference torque transmission capacity to reduce the bearing pressure of the weld. At the same time, the increase in matching diameter also increases the weld filling volume of the front axial 45° semi-U-shaped weld, which helps to improve the weld strength.

[0047] The diameter of the middle shaft 2 at the welding point of the second weld 4 is increased, and the main parameter is: d2 = 78.3 mm. Under the premise of ensuring that the weld filling area per unit cross section remains unchanged, the weld filling volume of the rear circumferential semi-U-shaped weld is increased, which helps to increase the bearing pressure of the second weld 4 at the weakest point. At the same time, the diameter of the middle shaft 2 at this position is increased, which also improves the torsion resistance and bending resistance at the weakest point;

[0048] The weld reinforcement of the rear circumferential semi-U-shaped weld was optimized with the help of CAE software. The main parameters are: h = 0 ~ 1mm. The analysis results show that this helps to reduce the stress value at the weld toe and weld root, and further improves the strength of the rear weld.

[0049] According to the results of physical and chemical analysis and test verification, the vertical gap of the positioning shoulder of the original rear-end circumferential semi-U-shaped weld is exactly at the root of the actual weld, which will greatly reduce the strength of the weld. Therefore, based on this risk, the positioning shoulder is moved forward by 10mm, and the main parameters are: L2 = 39mm, and the original vertical gap of the positioning shoulder is converted into an axial gap after welding, which has a great effect on improving the strength of the weld.

[0050] According to the above, the welding parameters of the auxiliary box welding shaft based on argon arc welding and the main parameters of the welded parts are shown in Table 1 and Figure 4 shown.

[0051] Table 1 Parameters of the auxiliary box welding shaft weld and main parameters of the welded parts based on argon arc welding

[0052] Parameter name Parameter code Improved parameter values Second weld positioning distance L1 51.2mm Positioning shoulder distance L2 39mm First weld positioning distance L3 6.6mm Interference fit length of shaft hole L4 29.5mm Shaft hole matching diameter d1 60.34mm The diameter of the second weld d2 78.3mm Second weld depth H 5mm Second weld reinforcement h 0~1mm Length of the first weld right angle side K 5mm Unit cross-sectional area of ​​the first weld S1 <![CDATA[26.12mm 2 ]]> Unit cross-sectional area of ​​the second weld S2 <![CDATA[20.7mm 2 ]]> Web thickness T 15mm Web inclination angle α 4° Interference 0.055~0.095mm

[0053] In summary, the utility model provides a transmission auxiliary box welding shaft structure based on argon arc welding, and the stress of the weld root and weld toe of the first weld and the second weld is greatly reduced; at the same time, the optimized structure is subjected to fatigue life test verification, and the test results show that the structure greatly improves the fatigue life of the welded shaft. It solves the problem of weld opening / fracture of the transmission auxiliary box welding shaft in the prior art, which can reduce the market failure rate and greatly improve the reliability of the transmission; it breaks through the bottleneck of insufficient weld strength of the auxiliary box welding shaft of the high-torque transmission re-torque product, and lays the foundation for the development of high-torque transmissions; from the two perspectives of weld parameters and main parameters of welded parts, the interference fit diameter, interference amount, web thickness and inclination, positioning shoulder position, weld unit cross-sectional area, weld filling volume, weld excess height and other parameters are comprehensively considered to optimize and improve the fatigue life of the auxiliary box welding shaft, which provides reference for subsequent in-depth research.

[0054] By increasing the interference, the preheating temperature of the intermediate shaft transmission gear 1 is appropriately increased before press-fitting; due to the changes in the first weld morphology, the shaft hole matching diameter, and the second weld diameter, the filling volume of the first weld and the second weld is increased, thereby improving the strength of the weld.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A transmission auxiliary box welding shaft structure based on argon arc welding, characterized in that: The invention comprises an intermediate shaft transmission gear (1) and an intermediate shaft (2), wherein the intermediate shaft transmission gear (1) is interference-fitted on the intermediate shaft (2), wherein a first weld (3) is formed at a welding point between one end of the intermediate shaft transmission gear (1) and the intermediate shaft (2), and a second weld (4) is formed at a welding point between the other end of the intermediate shaft transmission gear (1) and the intermediate shaft (2), and the first weld (3) and the second weld (4) are arranged by argon arc welding.

2. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The first weld (3) is an inclined U-shaped weld in the axial direction of the intermediate shaft (2), wherein the diameter of the U-shaped weld of the first weld (3) is in the range of 55 to 62 mm.

3. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The second weld (4) is a semi-U-shaped weld structure between the intermediate shaft transmission gear (1) and the intermediate shaft (2), wherein the depth of the second weld (4) ranges from 4 to 6 mm, and the weld excess height of the second weld (4) ranges from 0 to 2 mm.

4. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The two ends of the intermediate shaft transmission gear (1) are gear tops (11), and the second weld (4) is positioned at a distance from the gear top (11) to the outside of the intermediate shaft (2), wherein the positioning spacing ranges from 45 to 53 mm.

5. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The first weld (3) is positioned on the intermediate shaft (2) through the contact between the intermediate shaft transmission gear (1) and the intermediate shaft (2), wherein the positioning spacing ranges from 5 to 7.5 mm.

6. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The inner sides of both ends of the intermediate shaft transmission gear (1) are provided with webs (12), the thickness of the webs (12) ranges from 10 to 20 mm, and the webs (12) are inclined, wherein the bevel angle ranges from -26° to 18.8°.

7. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The intermediate shaft (2) is provided with a first pillow block (21), a second pillow block (22) and a third pillow block (23) in sequence from the outside to the inside along the axial direction; the intermediate shaft transmission gear (1) is interference-fitted on the first pillow block (21) and the intermediate shaft transmission gear (1) is gap-fitted on the second pillow block (22); the first weld (3) is the gap between the intermediate shaft transmission gear (1) and the first pillow block (21); and the second weld (4) is the gap between the intermediate shaft transmission gear (1) and the third pillow block (23).

8. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 7 is characterized in that: The diameter of the first pillow block (21) is smaller than the diameter of the second pillow block (22), the diameter of the second pillow block (22) is smaller than the diameter of the third pillow block (23), the diameter of the first pillow block (21) ranges from 55 to 65 mm, and the diameter of the third pillow block (23) ranges from 76 to 82 mm.

9. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1 is characterized in that: The interference fit between the intermediate shaft transmission gear (1) and the intermediate shaft (2) is in the range of 0.055 to 0.095 mm.

10. The transmission auxiliary box welding shaft structure based on argon arc welding according to claim 1, characterized in that: The filling area of ​​the first weld (3) is in the range of 12.5 to 27 mm 2 The filling area of ​​the second weld (4) ranges from 19.5 to 31.73 mm 2 .

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