WO2012077405A1

WO2012077405A1 - Hollow engine valve welding method

Info

Publication number: WO2012077405A1
Application number: PCT/JP2011/073478
Authority: WO
Inventors: 藤谷　泰之; 宏和森井; 健一郎平尾; 坪田　秀峰
Original assignee: 三菱重工業株式会社
Priority date: 2010-12-08
Filing date: 2011-10-13
Publication date: 2012-06-14
Also published as: JP2012122388A

Abstract

Provided is a hollow engine valve welding method which can improve the quality of a welding part. The hollow engine valve welding method can obtain a hollow engine valve by means of a valve umbrella member (11) having a hollow shaft shape with an umbrella shape at an end thereof and a shaft-end sealing member (12) having a shaft shape being welded to each other, wherein electronic beams (E) are irradiated, from two positions which are point-symmetric with respect to the axis of the valve umbrella member (11) and the shaft-end sealing member (12), onto a welding part formed by bringing an end surface (21) of a hollow shaft part (11b) of the valve umbrella member (11) into contact with an end surface (31) of the shaft-end sealing member (12), and along with this the valve umbrella member (11) and the shaft-end sealing member (12) which have been brought into contact with each other are rotated about said axis. As a result, the valve umbrella member (11) and the shaft-end sealing member (12) are welded together.

Description

Hollow engine valve welding method

The present invention relates to a method for welding a hollow engine valve capable of integrally joining a hollow shaft-shaped valve umbrella member and a shaft-shaped shaft end sealing member in an engine valve manufacturing process.

In recent years, various types of engine valves have been provided in which the interior of the engine valve is hollowed and the sodium metal for refrigerant is sealed in the hollow part as the output of the engine increases and the performance of the engine increases. . As a result, the weight is reduced as compared with a solid engine valve, and the heat conductivity is improved by the action of the enclosed metallic sodium.

And when manufacturing a hollow engine valve, after processing a hollow shaft-shaped valve head member and a shaft-shaped shaft end sealing member separately, respectively, the valve head member and shaft end into which metallic sodium was injected The sealing member is welded. Such a conventional method for welding a hollow engine valve is disclosed in Patent Document 1, for example.

Japanese Patent Laid-Open No. 7-102917

Here, in the welded portion between the valve head member and the shaft end sealing member, since the hollow engine valve itself is formed in a small diameter, it is easy to cause collapse, misalignment, and thermal deformation due to welding heat. However, in the conventional welding method described above, no such measures have been taken and there is a possibility that the quality of the welded portion may be deteriorated.

Therefore, the present invention solves the above-described problems, and an object thereof is to provide a method for welding a hollow engine valve that can improve the quality of a welded portion.

A method for welding a hollow engine valve according to a first aspect of the present invention for solving the above-described problem is as follows.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The welded portion formed by abutting the end surface of the hollow shaft member and the end surface of the shaft end sealing member is point-symmetric with respect to the axial center of the hollow shaft member and the shaft end sealing member 2 Simultaneously irradiate an electron beam or laser light from the direction,
The hollow shaft member and the shaft end sealing member with which the end faces are butted together, and an electron beam or a laser beam are relatively rotated around the axis of the hollow shaft member and the shaft end sealing member,
The hollow shaft member and the shaft end sealing member are welded.

A method for welding a hollow engine valve according to a second aspect of the present invention for solving the above-described problem is as follows.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
Coaxial with the axial center of the hollow shaft member and the shaft end sealing member over the entire circumferential direction of the welded portion formed by abutting the end surface of the hollow shaft member and the end surface of the shaft end sealing member. Irradiate a laser beam condensed in a ring shape like
The hollow shaft member and the shaft end sealing member are welded.

A method for welding a hollow engine valve according to a third aspect of the present invention for solving the above problem is as follows.
A fitting portion that fits into a hollow hole of the hollow shaft member is formed on an end surface of the shaft end sealing member.

A method for welding a hollow engine valve according to a fourth aspect of the present invention for solving the above-described problem is as follows.
While the end surface of the hollow shaft member is an inclined surface that is inclined so that its outer diameter gradually decreases toward the tip,
The end surface of the shaft end sealing member is an inclined surface that is inclined so that its inner diameter gradually increases toward the tip.

A hollow engine valve welding method according to a fifth aspect of the present invention for solving the above-described problems is as follows.
The hollow shaft member is cooled by a cooling means during welding.

A hollow engine valve welding method according to a sixth aspect of the present invention for solving the above-described problem is as follows.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The shaft end sealing member is
The outer diameter is formed so as to gradually decrease toward the tip, and can be in line contact with the opening peripheral edge of the hollow hole in the hollow shaft member, and can be inserted into the hollow hole.
Provided at the tip of the outer peripheral inclined portion, comprising a fitting portion that can be fitted with the hollow hole,
The outer peripheral inclined portion, the fitting portion, and the hollow are formed by inserting the outer peripheral inclined portion into the hollow hole while making line contact with the peripheral edge portion of the opening and fitting the fitting portion into the hollow hole. An annular gap is formed between the holes,
While the outer peripheral inclined portion and the hollow hole are in pressure contact, the gap generated by the pressure contact is filled in the gap.

A hollow engine valve welding method according to a seventh aspect of the present invention for solving the above-described problem is
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The shaft end sealing member is
An end surface in contact with an end surface of the hollow shaft member;
A projection that can be inserted into the hollow hole of the hollow shaft member, formed at the center of the end surface of the shaft end sealing member and having an outer diameter that gradually decreases toward the tip;
Provided at the tip of the protrusion, and includes a fitting portion that can be fitted into the hollow hole,
The end face of the hollow shaft member and the end face of the shaft end sealing member are abutted, the protrusion is inserted into the hollow hole, and the fitting portion is fitted into the hollow hole, whereby the protrusion And forming an annular gap between the fitting portion and the hollow hole,
While the end surface of the hollow shaft member and the end surface of the shaft end sealing member are in pressure contact with each other, the flash generated by the pressure contact is filled in the gap.

Therefore, according to the method for welding hollow engine valves according to the present invention, it is possible to suppress the collapse, misalignment, and thermal deformation at the welded portion between the hollow shaft-shaped hollow shaft member and the shaft-shaped shaft end sealing member. As a result, the quality of the welded portion can be improved.

It is a longitudinal cross-sectional view of a hollow engine valve. It is the figure which showed the welding method of the hollow engine valve which concerns on 1st Example of this invention, Comprising: (a) is a top view of the hollow engine valve at the time of the welding, (b) is the hollow engine valve at the time of the welding It is a longitudinal cross-sectional view. It is the figure which showed the welding method of the hollow engine valve which concerns on 2nd Example of this invention, Comprising: (a) is a top view of the hollow engine valve at the time of the welding, (b) is the hollow engine valve at the time of the welding It is a longitudinal cross-sectional view. It is a schematic block diagram of a laser welding apparatus. It is the figure which showed the groove shape between a valve head member and a shaft end sealing member, Comprising: (a) is the figure which showed the fitting type groove, (b) is the figure which showed the inclination type groove. is there. It is the figure which showed the welding method of the hollow engine valve which concerns on 3rd Example of this invention, Comprising: (a) is a longitudinal cross-sectional view of the hollow engine valve at the time of the butt | matching, (b) is the hollow engine valve after the welding FIG. It is the figure which showed the groove shape between a valve head member and a shaft end sealing member, Comprising: (a) is the figure which showed the line contact type groove, (b) The figure which showed the fitting type groove It is. It is the figure which showed the welding method of the hollow engine valve which concerns on 4th Example of this invention, Comprising: (a) is a longitudinal cross-sectional view of the hollow engine valve at the time of the butt | matching, (b) is the hollow engine valve after the welding FIG. It is the figure which showed the groove shape between a valve head member and a shaft end sealing member.

Hereinafter, a method for welding a hollow engine valve according to the present invention will be described in detail with reference to the drawings.

First, as shown in FIG. 1, a hollow engine valve 1 manufactured using a welding method according to the present invention is used as an intake valve or an exhaust valve in an engine such as a vehicle, and has a hollow shaft shape. The valve head member (hollow shaft member) 11 and the shaft-shaped (solid-shaped) shaft end sealing member 12 are configured. The valve head member 11 and the shaft end sealing member 12 are welded between the shaft ends of each other.

Furthermore, the valve head member 11 has an umbrella-shaped valve head portion 11a and a hollow shaft-shaped hollow shaft portion (hollow shaft member) 11b. Inside the valve head member 11, a hollow hole 11c is formed. It is formed so that the shape of the said valve head part 11a and the hollow shaft part 11b may be followed over the valve head part 11a and the hollow shaft part 11b. And the metal sodium N for refrigerant | coolants is enclosed in the hollow hole 11c.

Hereinafter, the welding method of the valve head member 11 and the shaft end sealing member 12 will be described in detail.

First, FIGS. 2A and 2B show a welding method according to the first embodiment of the present invention, in which the valve head member 11 and the shaft end sealing member 12 are joined by an electron beam welding method. The case where it welds using is demonstrated.

As shown in FIGS. 2A and 2B, first, the end surface 21 of the hollow shaft portion 11b in the valve head member 11 and the end surface 31 of the shaft end sealing member 12 are butted together, Rotate the object around its axis. Next, two electron beams E are irradiated from the outside in the radial direction on the welded portion (welded joint portion) formed by abutting the end surface 21 and the end surface 31, and two locations are welded simultaneously. In addition, you may make it rotate the two electron beams E around the axial center, without rotating the valve head member 11 and the shaft end sealing member 12 which were faced | matched.

At this time, the irradiation direction (welding direction) of the electron beam E is two opposite directions that are point contrasts with respect to the shaft centers of the valve head member 11 and the shaft end sealing member 12. That is, the irradiation position (welding position) with respect to the welded portion is set to a position where the phase is shifted by 180 ° in the circumferential direction of the valve head member 11 and the shaft end sealing member 12.

Therefore, welding is simultaneously performed on the welded portion between the valve head member 11 and the shaft end sealing member 12 by the two electron beams E irradiated so as to face each other from the radially outer side toward the shaft center. Thereby, the fall of a welding part can be suppressed. Moreover, since the irradiation (welding) area in a welding part can be made small by irradiating with the electron beam E, a thermal deformation (welding distortion) can also be suppressed. Thereby, the quality of the welding part of the valve head member 11 and the shaft end sealing member 12 can be improved, and as a result, the high quality hollow engine valve 1 can be manufactured.

In the welding method described above, the two electron beams E are irradiated as a set to the welded portion between the valve head member 11 and the shaft end sealing member 12. As long as the electron beam E is irradiated from two directions that are point-symmetric with respect to the axis of the umbrella member 11 and the shaft end sealing member 12, a plurality of sets of electron beams E may be irradiated (FIG. 2 ( a)). Thereby, shortening of welding time can be aimed at. Further, although the electron beam welding method is employed, the same effect can be obtained even when the laser welding method is employed.

Next, FIGS. 3A, 3B, and 4 show a welding method according to a second embodiment of the present invention, in which the valve head member 11 and the shaft end sealing member 12 are joined together. The case where it welds using a laser welding method is demonstrated.

3A and 3B, first, the end surface 21 of the hollow shaft portion 11b in the valve head member 11 and the end surface 31 of the shaft end sealing member 12 are brought into contact with each other. Next, the laser beam L is applied to the welded portion (welded joint portion) formed by abutting the end surface 21 and the end surface 31 through the ring-shaped reflection mirror 45, and the entire circumferential direction is welded simultaneously. To do.

At this time, as shown in FIG. 4, the welded portion between the valve head member 11 and the shaft end sealing member 12 is welded by the laser light L generated by the laser welding device 40. The laser welding apparatus 40 includes a laser oscillator 41 that oscillates a laser beam L, an optical fiber 42 connected to the laser oscillator 41, a reflection mirror 43 provided to face the optical fiber 42, and the reflection mirror. An imaging lens group 44 provided below 43 and a ring-shaped reflection mirror 45 provided coaxially therewith below the imaging lens group 44 are provided.

In addition, the valve head member 11 and the shaft end sealing member 12 with which the end faces 21 and 31 are abutted with each other are arranged inside the ring-shaped reflection mirror 45 so as to be coaxial with the reflection mirror 45. The laser beam L is irradiated to the welded portion.

As a result, the valve head member 11 and the shaft end sealing member 12 are faced to each other and are installed below the laser welding device 40 so as to be coaxial with the laser welding device 40 and driven by the laser oscillator 41. The laser light L is output from the optical fiber 42, deflected downward by the reflection mirror 43, and then input to the imaging lens group 44. Next, the laser light L input to the imaging lens group 44 is condensed in a ring shape by the imaging lens group 44 so as to be coaxial with the installed valve head member 11 and the shaft end sealing member 12. Is done. The laser beam L condensed in a ring shape is deflected inward by the reflection mirror 45 and irradiates the entire circumferential direction of the welded portion between the valve head member 11 and the shaft end sealing member 12.

Therefore, the laser beam condensed in a ring shape so as to be coaxial with the axis of the valve head member 11 and the shaft end sealing member 12 with respect to the welded portion between the valve head member 11 and the shaft end sealing member 12. , It is possible to suppress the collapse of the welded portion. Moreover, since the irradiation (welding) area in a welding part can be made small by irradiating with the laser beam L, a thermal deformation (welding distortion) can also be suppressed. Thereby, the quality of the welding part of the valve head member 11 and the shaft end sealing member 12 can be improved, and as a result, the high quality hollow engine valve 1 can be manufactured.

In the first and second embodiments described above, the groove shape (welded portion) between the valve head member 11 and the shaft end sealing member 12 is abutted against the end surfaces 21 and 31 that are one plane. For example, a groove shape as shown in FIGS. 5A and 5B may be used.

As shown in FIG. 5A, a columnar fitting portion 32b that fits into the hollow hole 11c of the valve head member 11 is formed on the end surface 32a of the shaft end sealing member 12. Then, when the end surface 21 of the hollow shaft portion 11b in the valve umbrella member 11 and the end surface 32a of the shaft end sealing member 12 are abutted, the fitting portion 32b is fitted into the hollow hole 11c.

Moreover, as shown in FIG.5 (b), the outer peripheral inclined surface 23 inclined so that the outer diameter may become small gradually as the outer diameter goes to a front-end | tip is formed in the edge part of the hollow shaft 11b of the valve head member 11. As shown in FIG. . On the other hand, an inner peripheral inclined surface 33 is formed at the end of the shaft end sealing member 12 so that its inner diameter gradually increases as it goes toward the tip. Then, when the hollow shaft portion 11b of the valve umbrella member 11 and the shaft end sealing member 12 are brought into contact with each other, the

inclined surfaces

23 and 33 are brought into close contact with each other.

Therefore, by adopting the groove shape as shown in FIGS. 5A and 5B, it is possible to suppress the collapse and displacement of the welded portion between the valve head member 11 and the shaft end sealing member 12. The fall of the inner beam generated by welding into the hollow hole 11c can be prevented.

Further, when the hollow shaft-shaped valve umbrella member 11 and the shaft-shaped shaft end sealing member 12 are welded as in the first and second embodiments described above, the valve umbrella member 11 is hollow. Therefore, a difference in heat capacity is likely to occur between them. Therefore, the valve head member 11 having a small heat capacity may be cooled using liquid, gas, or the like. By using such a cooling means to cool the valve head member 11 during welding, the difference in heat capacity between the valve head member 11 and the shaft end sealing member 12 can be reduced. The quality can be stabilized. Moreover, since the internal pressure in the hollow hole 11c can be suppressed by cooling the valve umbrella member 11, the blowout from the welding part of the metal sodium N to seal can be prevented.

Furthermore, in the first embodiment and the second embodiment described above, welding may be performed in a vacuum state or a reduced pressure state. Thereby, the penetration | invasion of the air into the hollow hole 11c can be prevented, the ignition of the metallic sodium N can be prevented, and the penetration at the time of welding can be stabilized.

Next, FIGS. 6A and 6B show a welding method according to a third embodiment of the present invention, in which the valve head member 11 and the shaft end sealing member 12 are joined by resistance welding. The case where it welds using (pressure welding method) is demonstrated.

As shown in FIG. 6 (a), an outer peripheral inclined portion 34a and a fitting portion 34b are successively formed at the end of the shaft end sealing member 12 in order toward the tip. The outer peripheral inclined portion 34a is formed such that its outer diameter gradually decreases toward the tip, can be in line contact with the opening peripheral edge portion 22 of the hollow hole 11c, and can be inserted into the hollow hole 11c. Yes. The fitting portion 34b is formed continuously from the tip of the outer peripheral inclined portion 34a and can be fitted to the hollow hole 11c. In addition, the opening peripheral part 22 is a corner | angular part (tip corner | angular part of the hollow hole 11c) which consists of the hollow hole 11c and the end surface 21. FIG.

Then, when the valve umbrella member 11 and the shaft end sealing member 12 are brought into contact with each other, the opening peripheral edge portion 22 and the outer peripheral inclined portion 34a are in line contact, and the distal end of the outer peripheral inclined portion 34a is inserted into the hollow hole 11c. Furthermore, the fitting portion 34b is fitted into the hollow hole 11c. As a result, an annular gap is formed between the hollow hole 11c, the outer peripheral inclined portion 34a, and the fitting portion 34b, and this gap becomes the flash receiving portion 34c.

Thereby, as mentioned above, in a state where the valve head member 11 and the shaft end sealing member 12 are in contact with each other, an electric current is passed through them to heat them, and pressure is applied from the axial direction to these welds. On the other hand, resistance welding can be performed. Further, the inner beam generated by such resistance welding is filled in the beam receiving portion 34c (see FIG. 6B).

Accordingly, when the valve head member 11 and the shaft end sealing member 12 are brought into contact with each other, the outer peripheral inclined portion 34a is brought into line contact with the opening peripheral edge portion 22 and inserted into the hollow hole 11c, and the fitting portion 34b is inserted into the hollow hole 11c. By fitting and forming the beam receiving portion 34c and performing resistance welding on the welded portion thus obtained, the welded portion can be prevented from being tilted or displaced. Further, since the opening peripheral edge portion 22 and the outer peripheral inclined portion 34a are in line contact, heat generation due to contact electric resistance is likely to occur, and the quality of the welded portion can be made uniform. Thereby, the quality of the welding part of the valve head member 11 and the shaft end sealing member 12 can be improved, and as a result, the high quality hollow engine valve 1 can be manufactured. Furthermore, by forming the beam receiving portion 34c, it is possible to prevent the inner beam generated by resistance welding from falling into the hollow hole 11c.

In the third embodiment described above, the groove shape (welded portion) between the valve head member 11 and the shaft end sealing member 12 is formed by line contact and fitting between the butted members. For example, a groove shape as shown in FIGS. 7A and 7B may be used.

7A, only the outer peripheral inclined portion 34a is formed at the end of the shaft end sealing member 12. As shown in FIG. As a result, when the valve head member 11 and the shaft end sealing member 12 are brought into contact with each other, the opening peripheral edge portion 22 and the outer peripheral inclined portion 34a are in line contact with each other. Quality can be made uniform.

Moreover, as shown in FIG.7 (b), the outer peripheral inclination part 35a and the fitting part 35b are successively formed in the end part of the axial end sealing member 12 toward the front-end | tip. The outer peripheral inclined portion 35a is formed so that its outer diameter gradually decreases toward the tip, and is opposed to the end surface 21 of the hollow shaft portion 11b. The fitting portion 35b is formed continuously from the tip of the outer peripheral inclined portion 35a and can be fitted to the hollow hole 11c.

Then, when the valve head member 11 and the shaft end sealing member 12 are butted together, the fitting portion 35b is fitted into the hollow hole 11c. Therefore, it is possible to prevent the welded portion between the valve head member 11 and the shaft end sealing member 12 from falling down and being displaced, and the quality of the welded portion can be improved.

Next, FIGS. 8A and 8B show a welding method according to a fourth embodiment of the present invention, in which the valve head member 11 and the shaft end sealing member 12 are friction-welded. The case of welding using the (pressure welding method) is described.

As shown in FIG. 8 (a), on the end surface 36a of the shaft end sealing member 12, a protruding portion 36b and a fitting portion 36c are successively formed toward the tip. The protrusion 36b is formed at the center of the end surface 36a so that its outer diameter gradually decreases toward the tip, and can be inserted into the hollow hole 11c. The fitting portion 36c is formed continuously from the tip of the protrusion 36b and can be fitted to the hollow hole 11c.

When the end face 21 of the valve head member 11 and the end face 36a of the shaft end sealing member 12 are brought into contact with each other, the protrusion 36b is inserted into the hollow hole 11c and the fitting part 36c is fitted into the hollow hole 11c. To do. As a result, an annular gap is formed between the hollow hole 11c, the projecting portion 36b, and the fitting portion 36c, and this gap becomes a flash receiving portion 36d.

Thus, as described above, in a state where the valve head member 11 and the shaft end sealing member 12 are in contact with each other, at least one of them is rotated while applying axial pressure thereto, and the contacted

end surfaces

21 and 36a are in contact with each other. Generate frictional heat in between. Subsequently, when the frictional heat reaches a state sufficient for pressure welding, the rotation is stopped, and the pressure is applied in the axial direction as it is, so that friction welding can be performed on those welded portions. Further, the inner beam generated by such friction welding is filled in the beam receiving portion 36d (see FIG. 8B).

Therefore, when the end face 21 of the valve head member 11 and the end face 36a of the shaft end sealing member 12 are abutted, the protrusion 36b is inserted into the hollow hole 11c, and the fitting part 36c is fitted into the hollow hole 11c. By forming the beam receiving portion 36d and performing friction welding on the welded portion thus obtained, the welded portion can be prevented from falling or being displaced. Thereby, the quality of the welding part of the valve head member 11 and the shaft end sealing member 12 can be improved, and as a result, the high quality hollow engine valve 1 can be manufactured. Further, by forming the beam receiving portion 36d, it is possible to prevent the inner beam generated by friction welding from dropping into the hollow hole 11c.

In the fourth embodiment described above, the groove shape (welded portion) between the valve head member 11 and the shaft end sealing member 12 is composed of surface contact and fitting between the butted members. For example, a groove shape as shown in FIG. 9 may be used.

As shown in FIG. 9, only the protrusion 36 b is formed on the end surface 36 a of the shaft end sealing member 12. Thereby, the position shift of a welding part can be suppressed at the time of abutting of the valve head member 11 and the shaft end sealing member 12.

The present invention can be applied to a welding method for a hollow engine valve capable of improving productivity.

Claims

In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The welded portion formed by abutting the end surface of the hollow shaft member and the end surface of the shaft end sealing member is point-symmetric with respect to the axial center of the hollow shaft member and the shaft end sealing member 2 Simultaneously irradiate an electron beam or laser light from the direction,
The hollow shaft member and the shaft end sealing member with which the end faces are butted together, and an electron beam or a laser beam are relatively rotated around the axis of the hollow shaft member and the shaft end sealing member,
Welding the hollow shaft member and the shaft end sealing member. A method for welding a hollow engine valve.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
Coaxial with the axial center of the hollow shaft member and the shaft end sealing member over the entire circumferential direction of the welded portion formed by abutting the end surface of the hollow shaft member and the end surface of the shaft end sealing member. Irradiate a laser beam condensed in a ring shape like
Welding the hollow shaft member and the shaft end sealing member. A method for welding a hollow engine valve.
In the welding method of the hollow engine valve of Claim 1 or 2,
A hollow engine valve welding method, wherein a fitting portion that fits into a hollow hole of the hollow shaft member is formed on an end surface of the shaft end sealing member.
In the welding method of the hollow engine valve of Claim 1 or 2,
While the end surface of the hollow shaft member is an inclined surface that is inclined so that its outer diameter gradually decreases toward the tip,
A method for welding a hollow engine valve, wherein the end surface of the shaft end sealing member is an inclined surface that is inclined so that its inner diameter gradually increases toward the tip.
In the welding method of the hollow engine valve of Claim 1 or 2,
A hollow engine valve welding method, wherein the hollow shaft member is cooled by a cooling means during welding.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The shaft end sealing member is
The outer diameter is formed so as to gradually decrease toward the tip, and can be in line contact with the opening peripheral edge of the hollow hole in the hollow shaft member, and can be inserted into the hollow hole.
Provided at the tip of the outer peripheral inclined portion, comprising a fitting portion that can be fitted with the hollow hole,
The outer peripheral inclined portion, the fitting portion, and the hollow are formed by inserting the outer peripheral inclined portion into the hollow hole while making line contact with the peripheral edge portion of the opening and fitting the fitting portion into the hollow hole. An annular gap is formed between the holes,
A welding method for a hollow engine valve, wherein the gap generated by the pressure welding is filled in the gap while the outer peripheral inclined portion and the hollow hole are being pressure-welded.
In a welding method for a hollow engine valve obtained by welding a hollow shaft-shaped hollow shaft member and a shaft-shaped shaft end sealing member to each other,
The shaft end sealing member is
An end surface in contact with an end surface of the hollow shaft member;
A projection that can be inserted into the hollow hole of the hollow shaft member, at the center of the end surface of the shaft end sealing member, and formed so that its outer diameter gradually decreases toward the tip;
Provided at the tip of the protrusion, and includes a fitting portion that can be fitted into the hollow hole,
The end face of the hollow shaft member and the end face of the shaft end sealing member are abutted, the protrusion is inserted into the hollow hole, and the fitting portion is fitted into the hollow hole, whereby the protrusion And forming an annular gap between the fitting portion and the hollow hole,
A method for welding a hollow engine valve, wherein the gap generated by the pressure contact is filled in the gap while pressing the end surface of the hollow shaft member and the end surface of the shaft end sealing member.