Transmission shaft and processing method

Abstract

The present invention relates to the technical field of vehicle transmission shafts, and more specifically, to a transmission shaft and a processing method. A transmission shaft comprises: a shaft fork unit comprises a shaft body and a fork ear. The shaft body comprises an end cover, a first ring part, a second ring part and a third ring part. The end cover, the first ring part, the second ring part and the third ring part are fixedly connected in sequence. The shaft tube unit comprises a connecting part, an assembly part and a welding part. One end of the assembly part is fixedly connected to the connecting part, and the other end is fixedly connected to the welding part. Part of the inner circumferential wall of the assembly part abuts against the outer circumferential side of the third ring part. The inner circumferential wall of the assembly part, the first ring part, the third ring part and the second ring part surround to form a first exhaust channel. The inner wall of the connecting part and the shaft body surround to form an exhaust cavity. The first exhaust channel is connected to the exhaust cavity through a connecting unit. The weld unit is formed when the welding part is welded to the first ring part. In this way, the problem of insufficient welding strength during welding fork processing is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle transmission shafts, and in particular to a transmission shaft and a processing method thereof. Background Art

[0002] The drive shaft is a key component in the automobile transmission system. Its main function is to transfer the power generated by the engine to the wheels, so that the car can generate driving force. The drive shaft usually includes a shaft fork unit and a shaft tube. The shaft fork unit is usually used to connect the drive shaft with other parts of the vehicle to ensure the stability of power transmission. The shaft fork unit provides support and precise positioning for the drive shaft to prevent the drive shaft from deflecting or vibrating during operation. The shaft tube is the main part of the drive shaft and needs to be welded to the shaft fork unit.

[0003] In the prior art, the outer circle of the axle fork unit and the inner hole of the axle tube may become loose or break during the processing due to insufficient welding strength, which will shorten the life of the drive shaft, increase safety risks, reduce the performance of the entire drive shaft, and further affect the performance and safety of the vehicle. Summary of the invention

[0004] In order to solve the problem of insufficient welding strength during welding fork processing, the present invention provides a transmission shaft and a processing method.

[0005] In a first aspect, the present invention provides a transmission shaft, the transmission shaft comprising:

[0006] A shaft fork unit, the shaft fork unit comprising a shaft body and a fork ear; the shaft body comprising an end cover, a first ring, a second ring, and a third ring; the end cover, the first ring, the second ring, and the third ring are fixedly connected in sequence; one side of the end cover is fixedly connected to one end of the fork ear; the outer diameter of the second ring is smaller than the outer diameter of the third ring; the outer diameter of the third ring is smaller than the outer diameter of the first ring;

[0007] The shaft tube unit comprises a connecting portion, an assembly portion, and a welding portion; one end of the assembly portion is fixedly connected to the connecting portion, and the other end is fixedly connected to the welding portion; the two assembly portions are respectively arranged at the two ends of the connecting portion; part of the inner peripheral wall of the assembly portion abuts against the outer peripheral side of the third ring portion; one end of the welding portion away from the assembly portion abuts against one end of the first ring portion away from the fork ear; the inner peripheral wall of the assembly portion, the first ring portion, the third ring portion and the second ring portion surround to form a first exhaust channel; the connecting portion and the inner wall of the shaft body surround to form an exhaust cavity;

[0008] a communication unit, wherein the first exhaust passage is communicated with the exhaust cavity through the communication unit;

[0009] A weld unit is formed by welding the welding portion and the first ring portion.

[0010] In some embodiments, L1>L2; wherein L1 is the dimension of the second ring portion along its axial direction, and L2 is the dimension of the welding portion along its axial direction.

[0011] In some embodiments, the outer diameter of the second ring portion close to one end of the first ring portion gradually decreases toward the other end; the outer circumferential wall of the second ring portion close to one end of the first ring portion abuts against the inner circumferential wall of the welding portion, and the other end is spaced apart from the inner circumferential wall of the assembly portion.

[0012] In some embodiments, S1≤0.98*S2; wherein S1 is the minimum diameter of the outer contour of the second ring portion, and S2 is the outer contour diameter of the third ring portion.

[0013] In some embodiments, the connecting unit includes an axial groove; the axial groove is formed by a portion of the outer peripheral wall of the third ring portion being recessed in a direction close to its central axis; the axial groove and the inner wall of the assembly portion surround a second exhaust channel; one end of the second exhaust channel is connected to the first exhaust channel, and the other end is connected to the exhaust cavity.

[0014] In some embodiments, the plurality of axial grooves are evenly spaced along the circumference of the third ring portion.

[0015] In some embodiments, the connecting unit includes a first hole portion; at least a portion of the first hole portion penetrates the side wall of the second ring portion and / or the third ring portion; the first hole portion is arranged in a side area of ​​the second ring portion close to the third ring portion; and the first exhaust channel is connected to the exhaust cavity through the first hole portion.

[0016] In some embodiments, the plurality of first hole portions are evenly spaced along the circumference of the second ring portion.

[0017] In some embodiments, the communication unit further includes a second hole portion; one end of the second hole portion is communicated with the exhaust cavity, and the other end of the second hole portion penetrates the end cover portion and is communicated with the external space.

[0018] In a second aspect, the present invention provides a transmission shaft processing method, the transmission shaft processing method is applied to a transmission shaft described in the second aspect, and the transmission shaft processing method comprises:

[0019] Step S10, based on the processing requirements of the transmission shaft, the first ring portion of the driving shaft body is abutted against the welding portion of the shaft tube unit; wherein the welding portion is sleeved on the second ring portion, and the assembly portion is sleeved on the third ring portion;

[0020] Step S20, based on the abutment between the first ring portion and the welding portion, welding the transmission shaft; wherein the welding process includes welding one end of the welding portion close to the first ring portion to the first ring portion to form a weld unit; wherein the gas flows sequentially through the first exhaust channel and the exhaust cavity to the external space;

[0021] Step S30, based on the transmission shaft completing the welding process, detecting the porosity of the weld unit;

[0022] Step S40: based on the porosity of the weld unit being less than a set threshold, the transmission shaft is processed.

[0023] In some embodiments, the welding process in step S20 further includes an initial welding position of the weld unit adjacent to one side of the connecting unit; and the weld unit extends from the initial welding position toward a direction away from one side of the connecting unit.

[0024] In order to solve the problem of insufficient welding strength during welding fork processing, the present invention has the following advantages:

[0025] The shaft fork unit may include a shaft body and a fork ear, and the shaft body may include an end cover, a first ring, a second ring, and a third ring. The shaft tube unit may include a connecting portion, an assembly portion, and a welding portion. Part of the inner peripheral wall of the assembly portion may abut against the outer peripheral side of the third ring. The end cover, the first ring, the second ring, and the third ring may be fixedly connected in sequence, the outer diameter of the second ring may be smaller than the outer diameter of the third ring, and the outer diameter of the third ring may be smaller than the outer diameter of the first ring, so that the inner peripheral wall of the assembly portion, the first ring, and the third ring may surround the second ring to form a first exhaust channel, and the inner wall of the connecting portion and the shaft body may surround to form an exhaust cavity, and the irregular gas generated due to the presence of foreign matter between the shaft body and the shaft tube unit may flow from the first exhaust channel to the exhaust cavity through the connecting unit. This avoids the irregular gas from being heated during welding and rushing out from the welding unit formed when the welding portion and the first ring are welded to form a processing air hole, causing the connection part to loosen or break and affect the performance of the transmission shaft, and can improve the welding strength and thus improve the performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a transmission shaft according to an embodiment is shown;

[0027] Figure 2 A schematic diagram of a transmission shaft of another embodiment is shown;

[0028] Figure 3 A schematic diagram of a weld unit of a transmission shaft according to an embodiment is shown;

[0029] Figure 4 A schematic diagram of a transmission shaft processing method according to an embodiment is shown.

[0030] Figure numerals: 01 axle fork unit; 11 axle body; 111 end cover portion; 112 first ring portion; 113 second ring portion; 114 third ring portion; 115 fourth ring portion; 12 fork ear; 02 axle tube unit; 21 connecting portion; 22 assembly portion; 23 welding portion; 03 weld unit; 04 connecting unit; 41 axial groove; 42 first hole portion; 43 second hole portion. DETAILED DESCRIPTION

[0031] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0032] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0033] The drive shaft is a key component in the automobile transmission system, used to transmit the power generated by the engine to the wheels. The drive shaft usually includes a yoke unit 01 and a shaft tube unit 02. The shaft tube unit 02 is the main part of the drive shaft and needs to be welded with the yoke unit 01. When the drive shaft is processed, the outer circle of the yoke unit 01 and the inner hole of the shaft tube unit 02 can be an interference fit. The yoke unit 01 is pressed into the shaft tube unit 02, and the shaft tube unit 02 will expand slightly. Due to the irregular enclosed gas between the shaft tube unit 02 and the yoke unit 01, the gas expands due to heat during welding and rushes out from the weld unit 03 to form processing pores. The processing pores will make the welding strength insufficient and may cause the connection part 21 to loosen or break, affecting the performance of the drive shaft and further affecting the performance and safety of the vehicle. In order to solve the problem of insufficient welding strength during the welding fork processing, a drive shaft is proposed. Figure 1 As shown, the transmission shaft may include a shaft fork unit 01 , a shaft tube unit 02 , a connecting unit 04 , and a welding seam unit 03 .

[0034] The shaft fork unit 01 may include a shaft body 11 and a fork ear 12. The shaft body 11 may include an end cover 111, a first ring portion 112, a second ring portion 113, and a third ring portion 114. The end cover 111, the first ring portion 112, the second ring portion 113, and the third ring portion 114 may be fixedly connected in sequence, and the end cover 111, the first ring portion 112, the second ring portion 113, and the third ring portion 114 may be forged as a whole without a gap at the connection, which may improve the structural strength of the shaft body 11. One side of the end cover 111 may be fixedly connected to one end of the fork ear 12, which may improve the structural stability of the fork ear 12, and the fork ear 12 may be connected to other components for support. The shaft tube unit 02 may include a connection portion 21, an assembly portion 22, and a welding portion 23. One end of the assembly portion 22 may be fixedly connected to the connection portion 21, and the other end may be fixedly connected to the welding portion 23. The fixed connection may improve the connection strength between the assembly portion 22 and the connection portion 21 and the welding portion 23, and ensure the reliability of the structure. The two assembly portions 22 may be respectively arranged at the two ends of the connection portion 21. The weld unit 03 may be formed by welding the welding portion 23 to the first ring portion 112. The end of the welding portion 23 away from the assembly portion 22 may abut against the end of the first ring portion 112 away from the fork ear 12. The abutment may allow the welding heat to be more effectively transferred to the end of the welding portion 23 away from the assembly portion 22 and the end of the first ring portion 112 away from the fork ear 12, thereby promoting more uniform fusion and improving the welding strength. The outer diameter of the second ring portion 113 can be smaller than the outer diameter of the third ring portion 114, and the outer diameter of the third ring portion 114 can be smaller than the outer diameter of the first ring portion 112. Part of the inner peripheral wall of the assembly portion 22 can abut against the outer peripheral side of the third ring portion 114, so that the inner peripheral wall of the assembly portion 22, the first ring portion 112, the third ring portion 114 and the second ring portion 113 surround and form a first exhaust channel. The inner wall of the connecting portion 21 and the shaft body 11 can surround and form an exhaust cavity, and the first exhaust channel can be connected to the exhaust cavity through the connecting unit 04. Due to the presence of foreign matter between the shaft tube unit 02 and the shaft fork unit 01, there is an irregular closed gas between the shaft tube unit 02 and the shaft fork unit 01. During welding, the gas will expand due to heat and rush out from the position of the weld unit 03, thereby forming processing pores. The processing pores will make the welding strength insufficient and may cause the connection portion 21 to loosen or break. Therefore, the gas between the welding part 23 and the shaft body 11 can be discharged into the exhaust cavity through the connecting unit 04 through the first exhaust channel, so as to avoid the gas expanding due to heat during welding and rushing out from the weld unit 03 to form processing pores that affect the appearance quality of the weld, thereby improving the welding strength and thus improving the performance of the drive shaft.

[0035] In some embodiments, Figure 3As shown, the dimension L1 of the second ring portion 113 along the axial direction may be greater than the dimension L2 of the welding portion 23 along the axial direction. If the dimension of the welding portion 23 along the axial direction is greater than or equal to the dimension of the second ring portion 113 along the axial direction, the weld unit 03 formed by welding the welding portion 23 to the first ring portion 112 will block the first exhaust channel, making it impossible to exhaust gas, thereby generating processing pores during welding and reducing the welding strength.

[0036] In this embodiment, the outer peripheral wall of the second ring portion 113 close to one end of the first ring portion 112 can be in contact with the inner peripheral wall of the welding portion 23, so as to reduce the gap and increase the contact area, which is conducive to better forming a uniform weld unit 03, while improving the fusion effect and facilitating welding. The outer diameter of the second ring portion 113 close to one end of the first ring portion 112 can be gradually reduced toward the other end, and the outer peripheral wall of the second ring portion 113 away from one end of the first ring portion 112 can be spaced from the inner peripheral wall of the assembly portion 22, so that the gas can flow in the first exhaust channel in a direction away from the second ring portion 113, so as to facilitate exhaust.

[0037] In other embodiments, the shaft body 11 may further include a fourth ring portion 115, the outer diameter of the fourth ring portion 115 near one end of the third ring portion 114 gradually decreases toward the other end, the outer peripheral wall of the fourth ring portion 115 near one end of the third ring portion 114 may abut against the inner peripheral wall of the assembly portion 22, and the other end may be spaced apart from the inner peripheral wall of the assembly portion 22, and when the first ring portion 112 of the drive shaft body 11 abuts against the welding portion 23 of the shaft tube unit 02, the fourth ring portion 115 helps to guide.

[0038] In some embodiments, if the minimum outer diameter S1 of the second ring portion 113 is greater than 0.98 times the outer diameter S2 of the third ring portion 114, the gap between the assembly portion 22 and the second ring portion 113 is too small to cause the formed first exhaust channel to fail to meet the exhaust requirements, which will cause processing pores to appear during welding and affect the welding strength. The minimum outer diameter S1 of the second ring portion 113 can be less than or equal to 0.98 times the outer diameter S2 of the third ring portion 114, so that the channel size of the first exhaust channel can meet the exhaust requirements, thereby avoiding the occurrence of processing pores that affect the welding strength.

[0039] In some embodiments, the communication unit 04 may include an axial groove 41. The axial groove 41 may be formed by a portion of the outer peripheral wall of the third ring portion 114 being recessed in a direction close to the central axis thereof. The axial groove 41 may be surrounded by the inner wall of the assembly portion 22 to form a second exhaust channel. One end of the second exhaust channel may be connected to the first exhaust channel, and the other end may be connected to the exhaust cavity. The second exhaust channel may guide the gas of the first exhaust channel to flow along the axial groove 41 to the exhaust cavity, thereby reducing the retention of the gas in the first exhaust channel. This helps to more effectively discharge the gas generated during the welding process.

[0040] In other embodiments, the axial groove 41 can be formed by the inner wall of the assembly portion 22 being recessed in a direction close to its central axis, or can be formed by a portion of the outer peripheral wall of the third ring portion 114 being recessed in a direction close to the central axis of the third ring portion 114 together with the inner wall of the assembly portion 22 being recessed in a direction close to the central axis of the assembly portion 22. The increase in the cross-section of the second exhaust channel can be used for better exhaust, which helps to improve the exhaust efficiency and avoid the formation of processing pores.

[0041] In some embodiments, multiple axial grooves 41 can be evenly spaced along the circumference of the third ring portion 114, which increases the exhaust area and facilitates better exhaust. The even arrangement can make the gas evenly discharged and avoid gas blockage that affects exhaust and causes processing pores.

[0042] In some embodiments, Figure 2 As shown, the connecting unit 04 may include a first hole portion 42. At least part of the first hole portion 42 may penetrate the side wall of the second ring portion 113 and / or the third ring portion 114, and the direction in which at least part of the first hole portion 42 may penetrate the side wall of the second ring portion 113 and / or the third ring portion 114 may be perpendicular to the direction of the central axis of the second ring portion 113, or may be at a certain angle to the direction of the central axis of the second ring portion 113. The first hole portion 42 may be arranged in a side area of ​​the second ring portion 113 close to the third ring portion 114 to prevent the weld unit 03 from blocking the first hole portion 42 and affecting exhaust. The first exhaust channel may be connected to the exhaust cavity through the first hole portion 42. The gas may flow from the first exhaust channel to the exhaust cavity along the first hole portion 42, which is convenient for exhaust to avoid the occurrence of processing pores during welding and reduce the welding strength.

[0043] In some embodiments, multiple first hole portions 42 can be evenly spaced along the circumferential direction of the second ring portion 113. The multiple first hole portions 42 can allow the gas to be discharged from the first exhaust channel into the exhaust cavity through the multiple first hole portions 42, thereby enhancing the exhaust effect. The uniform arrangement can ensure that the gas is evenly discharged into the exhaust cavity, avoiding gas concentration affecting the exhaust efficiency.

[0044] In some embodiments, Figure 2 As shown, the communication unit 04 may further include a second hole portion 43, one end of which may be connected to the exhaust cavity, and the other end of which may penetrate the end cover portion 111 and be connected to the external space. Thus, the gas flowing into the exhaust cavity may be discharged to the external space through the second hole portion 43, thereby improving the exhaust efficiency. This prevents the gas from affecting the welding and generating processing pores to reduce the welding strength.

[0045] In some embodiments, Figure 4 As shown, in this embodiment, the transmission shaft processing method may include steps S10 to S40, and each step will be described in detail below.

[0046] Step S10, when the processing requirements of the transmission shaft are met, the first ring portion 112 of the shaft body 11 can be driven to abut against the welding portion 23 of the shaft tube unit 02, and the abutment can more effectively transfer the welding heat to the end of the welding portion 23 away from the assembly portion 22 and the end of the first ring portion 112 away from the fork ear 12, promoting more uniform fusion and improving the welding strength. The welding portion 23 can be sleeved on the second ring portion 113, and the assembly portion 22 can be sleeved on the third ring portion 114, so as to improve the structural stability of the transmission shaft.

[0047] Step S20, when the first ring portion 112 abuts against the welding portion 23, the transmission shaft may be welded, and the welding process may include welding one end of the welding portion 23 close to the first ring portion 112 to the first ring portion 112 to form a weld unit 03. Welding can improve the connection strength between the shaft fork unit 01 and the shaft tube unit 02 and thus improve the structural stability of the transmission shaft. The gas may flow through the first exhaust channel in sequence into the exhaust cavity, and then be discharged from the exhaust cavity to the external space.

[0048] Step S30: When the transmission shaft is welded, the porosity of the weld unit 03 can be detected, so as to facilitate the subsequent determination of whether the porosity of the weld unit 03 is qualified.

[0049] Step S40, when the porosity of the weld unit 03 is less than a set threshold (which may be a suitable value), the transmission shaft can be processed.

[0050] In some embodiments, in this embodiment, the welding process in step S20 may also include that the initial welding position of the weld unit 03 is adjacent to one side of the connecting unit 04, and the weld unit 03 may extend from the initial welding position toward a direction away from the side of the connecting unit 04. This arrangement can prevent the connecting unit 04 from being blocked by the weld unit 03 during the welding process and affect the exhaust, and can allow the gas to be smoothly discharged into the exhaust cavity through the connecting unit 04, and prevent the gas from being heated during welding and rushing out of the weld unit 03 to form processing pores that affect the welding strength.

[0051] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A transmission shaft, characterized in that: The transmission shaft comprises: A shaft fork unit, the shaft fork unit comprising a shaft body and a fork ear; the shaft body comprising an end cover, a first ring, a second ring, and a third ring; the end cover, the first ring, the second ring, and the third ring are fixedly connected in sequence; one side of the end cover is fixedly connected to one end of the fork ear; the outer diameter of the second ring is smaller than the outer diameter of the third ring; the outer diameter of the third ring is smaller than the outer diameter of the first ring; A shaft tube unit, the shaft tube unit comprises a connecting portion, an assembly portion, and a welding portion; one end of the assembly portion is fixedly connected to the connecting portion, and the other end is fixedly connected to the welding portion; the two assembly portions are respectively arranged at the two ends of the connecting portion; part of the inner circumferential wall of the assembly portion abuts against the outer circumferential side of the third ring portion, and the assembly portion is sleeved on the third ring portion to improve the structural stability of the transmission shaft; one end of the welding portion away from the assembly portion abuts against one end of the first ring portion away from the fork ear; the inner circumferential wall of the assembly portion, the first ring portion, the third ring portion and the second ring portion surround to form a first exhaust channel; the connecting portion and the inner wall of the shaft body surround to form an exhaust cavity; a communication unit, wherein the first exhaust passage is communicated with the exhaust cavity through the communication unit; a weld unit, wherein the weld unit is formed by welding the welding portion and the first ring portion; L1>L2; wherein L1 is the dimension of the second ring portion along its axial direction, and L2 is the dimension of the welding portion along its axial direction; The outer diameter of the second ring portion close to one end of the first ring portion gradually decreases toward the other end; the outer peripheral wall of the second ring portion close to one end of the first ring portion abuts against the inner peripheral wall of the welding portion, and the other end is spaced apart from the inner peripheral wall of the assembly portion.

2. A transmission shaft according to claim 1, characterized in that: S1≤0.98*S2; wherein S1 is the minimum diameter of the outer contour of the second ring portion, and S2 is the outer contour diameter of the third ring portion.

3. A transmission shaft according to claim 1, characterized in that: The connecting unit includes an axial groove; the axial groove is formed by a portion of the outer peripheral wall of the third ring portion being recessed in a direction close to its central axis; the axial groove and the inner wall of the assembly portion surround a second exhaust channel; one end of the second exhaust channel is connected to the first exhaust channel, and the other end is connected to the exhaust cavity.

4. A transmission shaft according to claim 3, characterized in that: The plurality of axial grooves are evenly spaced along the circumference of the third ring portion.

5. A transmission shaft according to claim 1, characterized in that: The connecting unit includes a first hole portion; at least a portion of the first hole portion penetrates the side wall of the second ring portion and / or the third ring portion; the first hole portion is arranged in a side area of ​​the second ring portion close to the third ring portion; the first exhaust channel is connected to the exhaust cavity through the first hole portion.

6. A transmission shaft according to claim 5, characterized in that: The plurality of first hole portions are evenly spaced along the circumference of the second ring portion.

7. A transmission shaft according to claim 3 or 5, characterized in that: The communication unit further includes a second hole portion; one end of the second hole portion is communicated with the exhaust cavity, and the other end of the second hole portion penetrates the end cover portion and is communicated with the external space.

8. A transmission shaft processing method, the transmission shaft processing method is applied to a transmission shaft as claimed in any one of claims 1 to 7, characterized in that: The transmission shaft processing method comprises: Step S10, based on the processing requirements of the transmission shaft, the first ring portion of the driving shaft body is abutted against the welding portion of the shaft tube unit; wherein the welding portion is sleeved on the second ring portion, and the assembly portion is sleeved on the third ring portion; Step S20, based on the abutment between the first ring portion and the welding portion, welding the transmission shaft; wherein the welding process includes welding one end of the welding portion close to the first ring portion to the first ring portion to form a weld unit; wherein the gas flows sequentially through the first exhaust channel and the exhaust cavity to the external space; Step S30, based on the transmission shaft completing the welding process, detecting the porosity of the weld unit; Step S40: based on the porosity of the weld unit being less than a set threshold, the transmission shaft is processed.

9. A transmission shaft processing method according to claim 8, characterized in that: The welding process in step S20 also includes an initial welding position of the weld unit adjacent to one side of the connecting unit; and the weld unit extends from the initial welding position toward a direction away from one side of the connecting unit.

Images