CN210566125U - Welding structure for intermediate shaft of transmission - Google Patents
Welding structure for intermediate shaft of transmission Download PDFInfo
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- CN210566125U CN210566125U CN201920798620.2U CN201920798620U CN210566125U CN 210566125 U CN210566125 U CN 210566125U CN 201920798620 U CN201920798620 U CN 201920798620U CN 210566125 U CN210566125 U CN 210566125U
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Abstract
The utility model provides a derailleur jackshaft welded structure, including the jackshaft and the piece gear of assembling on it, through optimizing the welding seam structure parameter of piece gear and the butt joint department of jackshaft shaft shoulder, make welding seam filling rate and extra height increase, improved welding quality; meanwhile, a second annular fillet weld is additionally arranged at the butt joint of the other side of the intermediate shaft and the other side of the plate gear, so that the torque transmission capacity is greatly improved, and the quality problems that the weld joint is not full, the surplus height and the fusion depth are insufficient and the like in the prior art are solved.
Description
Technical Field
The utility model relates to a welding technology field of jackshaft specifically is a derailleur jackshaft welded structure.
Background
The key problem of the existing large-torque transmission is the strength problem, while the main and auxiliary box double-intermediate-shaft structure transmission has the problems that an auxiliary box welding shaft assembly bears large torque and the welding seam strength is particularly important, and the welding seam cracks under the severe and severe working condition of the welding shaft assembly, mainly because the welding seam is not full of, and the weld seam strength is insufficient due to insufficient extra height or insufficient fusion depth.
The existing welding is carbon dioxide and argon gas mixed gas shielded welding, and has the characteristics of simple operation, higher efficiency and low equipment cost, but the welding quality is general, the stability is poor, and the problems cannot be solved by methods of increasing the diameter of a welding part, increasing the welding depth and the like due to the limitation of the capacity of welding equipment and the structural space of a speed changer.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a derailleur jackshaft welded structure satisfies the big moment of torsion of transmission through the mode of optimizing V type welding seam parameter and increasing a circumference fillet weld at the front end, improves jackshaft welding assembly reliability.
The utility model discloses a realize through following technical scheme:
a welding structure of a middle shaft of a transmission comprises the middle shaft and a plate gear sleeved on the middle shaft, wherein one end of a plate gear mounting hole is abutted against a shaft shoulder of the middle shaft, a first annular welding line is arranged at the butt joint of the mounting hole and the shaft shoulder, the cross section of the first annular welding line is of a V-shaped structure, and the cross section parameters are as follows;
the angle α of the groove of the welding seam surface is 30 degrees, the welding depth S is 5mm, and the residual height h is 1-1.8 mm;
and a second annular fillet weld is arranged at the joint of the other end of the sheet gear mounting hole and the intermediate shaft.
Preferably, an annular welding groove is formed in the joint of the sheet gear mounting hole and the shaft shoulder of the intermediate shaft, the axial section of the annular welding groove is V-shaped, and the first annular welding line is located in the annular welding groove.
Preferably, the fillet K of the second annular fillet weld is 5 mm.
Preferably, a space is reserved between the second annular fillet weld and the bearing positioning surface of the input end of the intermediate shaft.
Preferably, an intermediate shaft between the second annular fillet weld and the bearing positioning surface is of a stepped shaft structure.
Preferably, the inner hole of the plate gear is connected with the intermediate shaft in an interference fit manner.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a welding structure of a transmission intermediate shaft, which optimizes the welding seam structure parameters at the butt joint of a plate gear and an intermediate shaft shoulder, increases the welding seam filling rate and the extra height, and improves the welding quality; meanwhile, a second annular fillet weld is added at the butt joint of the middle shaft and the other side of the plate gear, so that the torque transmission capacity is greatly improved; under the condition of certain welding current, voltage, welding speed and welding wire diameter, the larger the groove is, the longer the electric arc is, and the longer the time for melting the welding wire and the base metal is, so that the quality problems of incomplete welding seam, insufficient residual height, insufficient fusion depth and the like in the welding seam in the prior art are solved.
Furthermore, the second annular fillet weld has a certain distance from the bearing positioning surface, so that the thermal deformation or cracking of the bearing positioning surface caused by the influence of welding heat is avoided. Meanwhile, the intermediate shaft between the bearing positioning surface and the fillet weld is provided with a step shaft structure, so that the convection area between a workpiece and air is increased, and the welding heat is taken away by cooling gas more quickly.
Drawings
FIG. 1 is a schematic view of a welding structure of a conventional intermediate shaft;
fig. 2 is a schematic view of the welding structure of the intermediate shaft of the present invention.
In the figure: 1. a plate gear; 2. an intermediate shaft.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.
Referring to fig. 2, a derailleur jackshaft welded structure, including chip gear 1 and jackshaft 2, chip gear 1 passes through the hole and installs the tip at jackshaft 2, and chip gear 1 adopts interference fit to be connected with jackshaft 2, and one side butt of chip gear 1 is in the shaft shoulder department of jackshaft, realizes the axial positioning of chip gear 1.
One end of a mounting hole in the center of the sheet gear 1 is flush with the end face of the sheet gear 1, the end is a first end, the first end abuts against a shaft shoulder of the intermediate shaft, and the other end of the mounting hole, which is lower than the other end face of the sheet gear 1, is a second end.
A first annular welding seam with a V-shaped section is arranged at the butt joint of the first end of the plate gear 1 and the shaft shoulder of the intermediate shaft, and the parameters of the annular welding seam are as follows;
the angle α of the groove of the welding seam surface is 30 degrees, the welding depth S is 5mm, and the residual height h is 1-1.8 mm;
the butt joint department of jackshaft 2 and the second end of piece gear 1 sets up second annular fillet weld, and the right-angle side size K of leg is 5 mm.
A distance is reserved between the second annular fillet weld and the front part of the bearing positioning surface at the input end of the intermediate shaft, the intermediate shaft corresponding to the distance is of a step shaft structure, the length of an installation section for installing the plate gear 1 on the intermediate shaft 2 can be understood to be larger than the width of the plate gear, the plate gear is installed on the installation section of the intermediate shaft, the installation section of the intermediate shaft can extend out of the second end of the plate gear 1, and the extended installation section is of the step shaft structure; because the second annular end fillet weld has certain distance with the bearing locating surface, the bearing locating surface thermal deformation or cracking caused by welding heat influence is avoided. Meanwhile, the intermediate shaft between the bearing positioning surface and the fillet weld is provided with a step shaft structure, so that the convection area between a workpiece and air is increased, and the welding heat is taken away by cooling gas more quickly.
In another embodiment, the length of the mounting section of the intermediate shaft 2 for mounting the plate gear 1 is equal to the width of the plate gear, and the second welding end is lower than the end face of the plate gear 1, so that the mounting section of the intermediate shaft extends out of the second annular fillet weld, and the extending end is in a step shaft structure.
The following is a detailed description of the welding method for the welding structure of the intermediate shaft of the transmission provided by the present invention.
Firstly, aligning the mounting hole of the sheet gear 1 with the shaft diameter of the intermediate shaft 2, and performing tooth alignment hot mounting in place to finish the interference fit mounting of the sheet gear 1 and the intermediate shaft 2.
And then, inclining the middle shaft assembly axially downwards, and clamping the center holes at the two ends of the middle shaft on a welding tool.
Finally, two welding guns are adopted to adjust the angle and extend to the welding seam for welding; or the welding gun of the existing equipment is used for welding the groove weld firstly, the middle shaft assembly is rotated by 180 degrees after welding, and the axial position and the angle of the welding gun are adjusted, so that the welding gun is aligned with the weld position of the fillet weld, and the welding of the fillet weld is completed.
Compared with the prior art, the utility model discloses following profitable technological effect has:
as shown in fig. 1, the conventional auxiliary box intermediate shaft assembly is composed of an intermediate shaft transmission gear 1 and an intermediate shaft 2, and due to the requirement of the shortest axial dimension compression, a hob for machining a shaft tooth 1 interferes with a gear at the front end (as R > a in fig. 2), the hob cannot be integrally machined, and due to large transmission torque, the hob and the gear can only be selected to be connected in an interference plus welding mode, a V-shaped circumferential welding seam is only arranged at the joint of the wheel 1 and the shaft 2, the angle α of a welding seam surface slope is 45 °, and the residual height h is greater than 0.
The technical scheme of the utility model optimizes the welding seam structure parameters at the butt joint of the plate gear 1 and the shaft shoulder of the intermediate shaft, so that the welding seam filling rate and the residual height are increased, and the welding quality is improved; meanwhile, a second annular fillet weld is added at the butt joint of the middle shaft and the other side of the plate gear, so that the torque transmission capacity is greatly improved; under the condition of certain welding current, voltage, welding speed and welding wire diameter, the larger the groove is, the longer the electric arc is, and the longer the time for melting the welding wire and the base metal is, so that the quality problems of incomplete welding seam, insufficient residual height, insufficient fusion depth and the like in the welding seam in the prior art are solved.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (6)
1. A welding structure of a transmission intermediate shaft is characterized by comprising the intermediate shaft (2) and a sheet gear (1) sleeved on the intermediate shaft (2), wherein one end of a mounting hole of the sheet gear (1) is abutted against a shaft shoulder of the intermediate shaft, a first annular welding line is arranged at the butt joint of the mounting hole and the shaft shoulder, the cross section of the first annular welding line is of a V-shaped structure, and the cross section parameters are as follows;
the angle α of the groove of the welding seam surface is 30 degrees, the welding depth S is 5mm, and the residual height h is 1-1.8 mm;
and a second annular fillet weld is arranged at the joint of the other end of the mounting hole of the plate gear (1) and the intermediate shaft.
2. A transmission countershaft welding structure according to claim 1, wherein a joint of the plate gear (1) mounting hole and a countershaft shoulder is provided with an annular welding groove having a V-shaped axial cross section, and the first annular weld is located in the annular welding groove.
3. The transmission countershaft welding structure of claim 1, wherein the fillet K of the second annular fillet weld is 5 mm.
4. The transmission countershaft weld arrangement of claim 1, wherein the second annular fillet weld is spaced from a bearing locating surface of the countershaft input end.
5. The transmission countershaft weld arrangement of claim 4, wherein the countershaft between the second annular fillet weld and the bearing locating surface is a stepped shaft configuration.
6. The transmission countershaft welding structure according to claim 1, wherein the inner hole of the plate gear (1) is connected with the countershaft (2) in an interference fit manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920798620.2U CN210566125U (en) | 2019-05-29 | 2019-05-29 | Welding structure for intermediate shaft of transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920798620.2U CN210566125U (en) | 2019-05-29 | 2019-05-29 | Welding structure for intermediate shaft of transmission |
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| Publication Number | Publication Date |
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| CN210566125U true CN210566125U (en) | 2020-05-19 |
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| CN201920798620.2U Active CN210566125U (en) | 2019-05-29 | 2019-05-29 | Welding structure for intermediate shaft of transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206869A (en) * | 2019-05-29 | 2019-09-06 | 西安法士特汽车传动有限公司 | A kind of transmission countershaft welding structure and its welding method |
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2019
- 2019-05-29 CN CN201920798620.2U patent/CN210566125U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206869A (en) * | 2019-05-29 | 2019-09-06 | 西安法士特汽车传动有限公司 | A kind of transmission countershaft welding structure and its welding method |
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