JP6167776B2 - Three-member laser welding structure - Google Patents

Description

  The present invention relates to a laser welding structure in which three resin members are laser-welded.

  As a technique related to conventional laser welding, for example, a technique applied to a vehicle fluid filter device as in Patent Document 1 is known.

  In the filter device of Patent Document 1, a filter element is provided between an upper case constituent member in which an upper flange portion is formed on the peripheral edge of the case and a lower case constituent member in which a lower flange portion is formed on the peripheral edge of the case. Has been placed.

  The upper case constituent member and the filter element are made of a laser light transmitting resin, and the lower case constituent member is made of a laser light non-transparent resin. In the upper flange portion, an upper abutting surface is formed in a region that is on the outer side in the extending direction, and a storage concave portion that stores a peripheral edge portion of the filter element is formed in a region on the inner side in the extending direction. The depth of the storage recess is formed shallower than the thickness of the peripheral edge of the filter element. On the other hand, in the lower flange portion, a lower contact surface is formed in a region that is outside in the extending direction, and an element welding surface is formed in a region that is inside in the extending direction.

  The upper contact surface and the lower contact surface are laser welded, and the peripheral edge portion of the filter element and the element weld surface are laser welded.

JP 2006-231875 A

  Normally, when two members are laser-welded, the contact surfaces are pressed together to ensure the reliability of the welded state. However, in the above Patent Document 1, there is no description regarding such crimping. Further, as described above, the depth of the storage recess is formed shallower than the thickness of the peripheral edge of the filter element. Therefore, in Patent Document 1, even if the upper flange portion and the lower flange portion are sandwiched between, for example, two jigs and the upper abutment surface and the lower abutment surface are pressure-bonded, the peripheral portion of the filter element is stored. It will protrude somewhat from the recess. Therefore, the upper and lower contact surfaces cannot be securely bonded to each other, and a highly reliable welding state cannot be obtained.

  In view of the above problems, an object of the present invention is to provide a three-member laser welding structure capable of ensuring a highly reliable welding state in which three members are laser-welded.

  In order to achieve the above object, the present invention employs the following technical means.

In the present invention, a lower case (14) formed with a first flange portion (141) projecting outward at the outer peripheral portion;
An upper case (11) in which a second flange portion (111) projecting outward at the outer peripheral portion is formed so as to face the first flange portion (141);
A partition plate (151) is formed between the first flange portion (141) and the second flange portion (111). 15)
The first flange portion (141) is formed from a light-absorbing resin, and the second flange portion (111) and the plate-like portion (151) are formed from a light-transmitting resin.
An accommodation recess (141b) for accommodating the plate-like portion (151) is formed in the inner region in the extending direction of the first flange portion (141),
A first contact surface (141a) formed on the second flange portion (111) side in the outer region in the extending direction of the first flange portion (141), and an outer region in the extending direction of the second flange portion (111). While the second contact surface (111a) formed on the first flange portion (141) side is laser-welded,
In the three-member laser welding structure in which the bottom surface (141c) of the housing recess (141b) and the first surface (151a) on the first flange portion (141) side of the plate-like portion (151) are laser-welded,
The 2nd surface (151b) used as the 2nd flange part (111) side of a plate-shaped part (151) protrudes in the 2nd flange part (111) side rather than the 1st contact surface (141a), and 2nd In the flange portion, a recess (111b) that is recessed from the second contact surface is formed in the inner region in the protruding direction from the second contact surface,
In addition, a gap (152) is formed between the second surface (151b) and the opposing surface (111c) facing the second surface (151b) of the second flange portion (111). It is a feature.

  According to the present invention, as described above, the second surface (151b) protrudes closer to the second flange portion (111) than the first contact surface (141a). Therefore, when laser welding the first flange portion (141) and the plate-like portion (151), the first flange portion (141) and the plate-like portion (151) are sandwiched by a predetermined jig, and the receiving recess (141b). When the bottom surface (141c) and the first surface (151a) of the plate-shaped portion (151) are pressure-bonded, the jig does not hit the first contact surface (141a). Accordingly, the bottom surface (141c) and the first surface (151a) can be securely bonded to each other.

  In this state, the bottom surface (151a) is melted by irradiating laser light from the plate-shaped portion (151) side, the bottom surface (141c) is melted, and the first surface (151a) is also melted by the heat at the time of melting. (141c) and the 1st surface (151a) can be welded reliably.

  In the present invention, a gap (152) is formed between the second surface (151b) and the opposing surface (111c). Therefore, when laser welding the first flange portion (141) and the second flange portion (111), the first flange portion (141) and the second flange portion (111) are sandwiched with a predetermined jig, and the first contact is made. When the contact surface (141a) and the second contact surface (111a) are pressure-bonded, the opposing surface (111c) does not hit the second surface (151b). Therefore, the first contact surface (141a) and the second contact surface (111a) can be securely bonded to each other.

  In this state, the laser beam is irradiated from the second flange portion (111) side to melt the first contact surface (141a), and the second contact surface (111a) is also melted by the heat at the time of melting. By doing, a 1st flange part (141) and a 2nd flange part (111) can be welded reliably.

  In general, the first flange portion (141) and the second flange portion (111) are laser-welded, and the first flange portion (141) and the plate-like portion (151) are laser-welded. In the structure (100), it is possible to ensure a highly reliable welding state.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.

It is a perspective view which shows the external appearance of the fuel vapor purge apparatus in 1st Embodiment. It is sectional drawing which shows the cross section in the II-II part in FIG. It is sectional drawing which shows the cross section in the III-III part in FIG. It is an expanded sectional view which shows the IV section in FIG. It is sectional drawing which shows the 1st process at the time of laser welding a 1st flange part and a plate-shaped part. It is sectional drawing which shows the 2nd process at the time of laser welding a 1st flange part and a 2nd flange part.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also a combination of the embodiments even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
A three-member laser welding structure (hereinafter referred to as a laser welding structure) 100 according to the first embodiment of the present invention will be described with reference to FIGS. The laser welding structure 100 is applied to, for example, an evaporative fuel purge apparatus 10 for a vehicle.

  Here, the evaporated fuel purge device 10 introduces evaporated fuel into the intake system (intake manifold) of the engine in order to prevent the evaporated fuel generated in the fuel tank from being released into the atmosphere during refueling. (Purge). The evaporated fuel introduced into the intake system of the engine is mixed with the original combustion fuel supplied to the engine from an injector or the like and burned in the cylinder of the engine. The evaporated fuel purge apparatus 10 is connected to an evaporated fuel purge system and an engine intake system.

  The evaporated fuel purge system is formed by an evaporated fuel pipe connected from the fuel tank to the intake manifold. On the other hand, an intake system of an engine is formed by providing a supercharger that pressurizes intake air in the middle of an intake pipe connected to an intake manifold. The supercharger is provided with a reflux path that connects the upstream side and the downstream side of the supercharger. An ejector is interposed in the middle of the reflux path. During the operation of the supercharger, a part of the intake air is circulated to the ejector by the return path.

  The evaporated fuel purge device 10 is disposed in the middle of the evaporated fuel pipe, a fuel inflow pipe 12 described later is connected to the fuel tank side, and a fuel outflow pipe 21 is connected to the intake manifold side. Further, the ejector pipe 22 is connected to the suction part side of the ejector.

  Hereinafter, the evaporated fuel purge apparatus 10 will be briefly described. As shown in FIGS. 1 to 3, the evaporated fuel purge apparatus 10 includes an inlet side case 11, a fuel inflow pipe 12, a filter 13, an outlet side case 14, a partition plate 15, a valve 16, a main flow path 17, and a branch flow path 18. , A first check valve 19, a second check valve 20, a fuel outflow pipe 21, an ejector pipe 22, and the like.

  The inlet side case 11 is a resin container having an opening portion 11a on the outlet side case 14 side (here, the lower side) described later, and the outer peripheral portion of the opening portion 11a intersects the outer peripheral wall. A flange portion 111 protruding outward in the direction is formed. The inside of the entrance side case 11 is an internal space 11b. The internal space 11b forms an internal flow path for allowing the introduced evaporated fuel to flow into a communication hole 15b of the partition plate 15 described later. The internal flow path is a flow path that forms the upstream side of the main flow path 17 formed in the outlet side case 14 described later.

  The fuel inflow pipe 12 is a pipe for allowing the evaporated fuel to flow into the inlet side case 11 (internal space 11b) from the fuel tank side, and is formed integrally with the inlet side case 11. The fuel inflow pipe 12 is provided in a portion where a recess is formed on the ceiling side (here, the upper side) of the inlet side case 11, and the longitudinal direction of the fuel inflow pipe 12 is parallel to the direction in which the flange portion 111 protrudes. It is arranged to be.

  The filter 13 captures dust, dust, and the like in the evaporated fuel, and is disposed at an intermediate position of the internal flow path formed by the internal space 11b. The filter 13 is formed of, for example, a mesh member having a fine mesh shape.

  The outlet side case 14 is a resin container having an opening portion 14a on the inlet side case 11 side (here, the upper side), and the outer peripheral portion of the opening portion 14a crosses the outer peripheral wall. A flange portion 141 protruding outward is formed.

  Further, on the bottom side of the outlet side case 14, portions corresponding to a fuel outflow pipe 21 and an ejector pipe 22, which will be described later, are recessed inward on the side walls facing each other perpendicular to the longitudinal direction of the fuel inflow pipe 12. It is formed as follows. The recessed inner side forms a flat cylindrical space. And the wall used as the recessed bottom part side is the 1st wall part 14b and the 2nd wall part 14c. A communication hole 14d is formed in the first wall portion 14b, and a communication hole 14e is formed in the second wall portion 14c. The communication hole 14d is a hole that allows the inside of the outlet side case 14 to communicate with a fuel outlet pipe 21 that will be described later, and the communication hole 14e is a hole that allows the inside of the outlet side case 14 to communicate with an ejector pipe 22 that will be described later. is there.

  The partition plate 15 has a plate shape as a whole, and is a member having a thick portion 15a that is partially thick in the inner region. The partition plate 15 is disposed so as to close the opening portion 14 a of the outlet side case 14, and the plate-like portion 151 having a plate shape at the outer peripheral portion includes the flange portion 111 of the inlet side case 11 and the outlet side case 14. It is arrange | positioned between the flange parts 141. FIG.

  The thick part 15 a is formed in a part of the partition plate 15 corresponding to a region on the downstream side of the filter 13 in the inlet side case 11. A communication hole 15b is formed in the thick portion 15a. The communication hole 15 b is a hole that allows communication between the internal space 11 b of the inlet side case 11 and the inside of the outlet side case 14. Further, in the thick portion 15a, the outer peripheral portion of the communication hole 15b on the outlet side case 14 side is a valve seat 15c on which a valve body 16a of a valve 16 described later is seated.

  The valve 16 is an opening / closing means for opening and closing the communication hole 15b, and is disposed in a portion of the outlet side case 14 that faces the communication hole 15b. As the valve 16, an electromagnetic valve provided with a valve body 16a, an electromagnetic coil 16b, and a spring 16c is used. The valve 16 moves the valve body 16a by a balance between the electromagnetic force when the electromagnetic coil 16b is energized via the terminal 16e of the connector 16d and the elastic force of the spring 16c by a control unit (not shown). 15b is opened and closed.

  The valve 16 normally maintains a state in which the communication hole 15b is closed, and when the electromagnetic coil 16b is energized by the control unit, the electromagnetic force overcomes the elastic force of the spring and opens the communication hole 15b. It is supposed to be.

  The main channel 17 is a channel through which evaporated fuel flows in the outlet side case 14, and includes a communication hole 15b, a valve body 16a of the valve 16, the inside of the outlet side case 14, and further a communication hole 14d of the first wall portion 14b. It is formed as a flow path that leads to the fuel outflow pipe 21 through.

  The branch flow path 18 is a flow path that branches from the main flow path 17 in the outlet side case 14, and is ejected from the valve body 16a of the valve 16 to the inside of the outlet side case 14 and the communication hole 14e of the second wall portion 14c. It is formed as a flow path to the service pipe 22. Therefore, the valve 16 (valve body 16a) is disposed in the main flow path 17 on the upstream side of the branch point where the branch flow path 18 branches.

  The first check valve 19 is a valve disposed in the main channel 17 on the downstream side of the branch point where the branch channel 18 branches. Specifically, the first check valve 19 is disposed on the first wall portion 14b. In the main flow path 17, the first check valve 19 inherently evaporates fuel from the fuel inflow pipe 12 to the internal space 11 b, the communication hole 15 b, the valve 16 (valve body 16 a), the main flow path 17, and further to the fuel outflow pipe 21. Is allowed to be distributed. In addition, the first check valve 19 prevents the backflow of the evaporated fuel from the fuel outflow pipe 21 side to the fuel inflow pipe 12 side. The first check valve 19 uses an umbrella-shaped valve body that opens the flow path with the original flow of the evaporated fuel and closes the flow path with the reverse flow of the evaporated fuel.

  The second check valve 20 is a valve disposed in the branch flow path 18. Specifically, the second check valve 20 is disposed on the second wall portion 14c. The second check valve 20 is an evaporative fuel from the fuel inflow pipe 12 to the internal space 11b, the communication hole 15b, the valve 16 (valve body 16a), the branch flow path 18, and further to the ejector pipe 22 in the branch flow path 18. The original distribution of is allowed. In addition, the second check valve 20 prevents the backflow of the evaporated fuel from the ejector pipe 22 side to the fuel outflow pipe 21 side (or the fuel inflow pipe 12 side). Similar to the first check valve 19, the second check valve 20 has an umbrella-shaped valve body that opens the flow path along with the original flow of the evaporated fuel and closes the flow path along with the reverse flow of the evaporated fuel. It is used.

  The fuel outflow pipe 21 communicates with the main flow path 17 on the downstream side of the first check valve 19 and protrudes to the outside of the outlet side case 14 and is a resin pipe through which evaporated fuel flows out to the intake manifold. Yes. The fuel outflow pipe 21 is formed as a separate part from the outlet side case 14, and a flange portion 21a is integrally provided on the base side. Moreover, the outer peripheral wall part 21b is formed in the outer peripheral part of the flange part 21a. And the flange part 21a is assembled so as to close the opening side of the recessed side wall part facing the first wall part 14b of the outlet side case 14, and is recessed with the outer peripheral wall part 21b of the flange part 21a. The inner peripheral side is joined to each other (for example, ultrasonic welding).

  The ejector pipe 22 communicates with the branch flow path 18 on the downstream side of the second check valve 20, protrudes to the outside of the outlet side case 14, and is made of a resin pipe that allows the evaporated fuel to flow out to the suction portion of the ejector. It has become. Similarly to the fuel outflow pipe 21, the ejector pipe 22 is formed as a separate part from the outlet side case 14, and a flange portion 22a is integrally provided on the base side. Moreover, the outer peripheral wall part 22b is formed in the outer peripheral part of the flange part 22a. And the flange part 22a is assembled so as to close the opening side of the recessed side wall part facing the second wall part 14c of the outlet side case 14, and is recessed with the outer peripheral wall part 22b of the flange part 22a. The inner peripheral side is joined to each other (for example, ultrasonic welding). The ejector pipe 22 is joined to the outlet side case 14 so as to face the opposite side to the fuel outflow pipe 21.

  In the fuel vapor purge apparatus 10 configured as described above, the valve 16 is opened by a control unit (not shown) when the supercharger is not operating when the vehicle is traveling. Then, due to the negative pressure in the intake manifold generated by the intake action of the piston, the evaporated fuel in the fuel tank causes the fuel inflow pipe 12, the internal space (internal flow path) 11b, the filter 13, the communication hole 15b, the valve 16, the main flow path. 17, the first check valve 19 (communication hole 14d) and the fuel outflow pipe 21 flow and are sucked into the intake manifold.

  Further, when the supercharger is operating when the vehicle is running, the intake manifold is positively pressurized by the pressurized intake air, so that it is difficult to suck the evaporated fuel as described above. In this case, a part of the intake air supercharged by the supercharger flows from the downstream side of the supercharger through the return path and the ejector and returns to the upstream side of the supercharger.

  At this time, when the valve 16 is opened by the control unit, the evaporated fuel in the fuel tank is supplied to the fuel inflow pipe 12, the internal space (internal flow path) 11b, the filter 13, the communication hole 15b, by the suction action of the ejector of the ejector. Passes through the valve 16, the branch flow path 18, the second check valve 20 (communication hole 14 e), and the ejector pipe 22, is sucked into the ejector from the suction portion, and is upstream of the supercharger together with the intake air flowing through the ejector It comes to be supplied.

  In the fuel vapor purge apparatus 10, the flange portion 111 of the inlet side case 11 is laser-welded to the flange portion 141 of the outlet side case 14. Further, the plate-like portion 151 of the partition plate 15 is laser-welded to the flange portion 141 of the outlet side case 14. These welds form the laser weld structure 100. The details will be described below with reference to FIGS.

  The outlet side case 14 corresponds to the first member of the present invention, the inlet side case 11 corresponds to the second member of the present invention, and the partition plate 15 corresponds to the third member of the present invention. Hereinafter, the flange portion 141 of the outlet side case 14 is referred to as a first flange portion 141, and the flange portion 111 of the inlet side case 11 is referred to as a second flange portion 111.

  The 1st flange part 141 (outlet side case 14) is formed from the light absorptive resin which can absorb the laser beam at the time of laser welding. As shown in FIG. 4, the surface on the side facing the second flange portion 111 in the outer region in the extending direction of the first flange portion 141 is formed as a first contact surface 141a. The first contact surface 141a is integrally formed with a convex portion 141d that protrudes toward the second flange portion 111 (second contact surface 111a described below) over the entire circumference of the first flange portion 141. (FIG. 5). The convex portion 141d is formed in, for example, a triangular shape or a semicircular shape whose width dimension decreases toward the tip side. Here, of the first contact surface 141a and the second contact surface 111a, the first contact surface 141a corresponds to one side of the present invention, and the second contact surface 111a corresponds to the other side of the present invention. It corresponds to.

  Further, in the first flange portion 141, the plate-like portion 151 is recessed from the first contact surface 141 a in a region inside the first contact surface 141 a in the projecting direction of the first flange portion 141. A housing recess 141b is formed which can house the housing. The recessed bottom portion of the housing recess 141b is a bottom surface 141c. Therefore, a stepped step portion 141f is formed between the first contact surface 141a and the housing recess portion 141b. And in the 1st flange part 141, the opposite side surface 141e used as the opposite side to the 1st contact surface 141a and the accommodation recessed part 141b is formed as one plane without a level | step difference.

  The 2nd flange part 111 (entrance side case 11) is formed from the light transmissive resin which can permeate | transmit the laser beam at the time of laser welding. In the outer region of the second flange portion 111 in the protruding direction, the surface facing the first flange portion 141 is formed as a second contact surface 111a. The setting region of the second contact surface 111a corresponds to the setting region of the first contact surface 141a, and the first contact surface 141a and the second contact surface 111a are surfaces that contact each other. .

  Further, in the second flange portion 111, a recessed portion 111b that is recessed from the second contact surface 111a is formed in a region that is inward of the second contact surface 111a in the protruding direction of the second flange portion 111. ing. The recessed portion of the concave portion 111b serves as an opposing surface 111c opposed to a second surface 151b of a plate-like portion 151 described later. Therefore, a stepped portion 111d is formed between the second contact surface 111a and the recess 111b.

  The plate-like portion 151 (partition plate 15) is made of a light transmissive resin that can transmit laser light during laser welding. The plate-like portion 151 is accommodated in the accommodating recess 141b. In the plate-like portion 151, the surface that comes into contact with the bottom surface 141c is a first surface 151a. Further, in the plate-like portion 151, the surface on the side facing the facing surface 111c is a second surface 151b.

  In a state where the plate-like portion 151 is accommodated in the accommodating recess 141b, the second surface 151b protrudes by a first predetermined amount from the first contact surface 141a toward the second flange portion 111. That is, the thickness dimension of the plate-shaped part 151 is set to be larger by the first predetermined amount than the depth dimension of the housing recess 141b.

  In addition, a second predetermined amount of gap 152 is formed between the second surface 151b and the opposing surface 111c. That is, the depth dimension of the recess 111b is set larger by the second predetermined amount than the projecting dimension of the second surface 151b from the first contact surface 141a.

  Furthermore, the thickness dimension tf of the second flange portion 111 corresponding to the second contact surface 111a and the thickness dimension tp of the plate-like portion 151 are set to be the same.

  Next, a procedure for laser welding between the first flange portion 141, the second flange portion 111, and the plate-like portion 151 will be described.

1. First step (welding the first flange part and the plate-like part, FIG. 5)
First, the first flange portion 141 is set on the upper side of the receiving jig 210. Subsequently, the plate-like portion 151 (partition plate 15) is set on the first flange portion 141 (exit side case 14). At this time, the plate-like portion 151 is positioned with respect to the first flange portion 141 by the bottom portion surface 141c and the stepped portion 141f by setting the plate-like portion 151 so as to be fitted into the accommodating recess 141b.

  Next, the holding jig 220 is set on the second surface 151 b of the plate-like portion 151. That is, the side surface 141e opposite to the first flange portion 141 and the second surface 151b of the plate-like portion 151 are sandwiched between the receiving jig 210 and the holding jig 220, and the holding jig 220 sets the predetermined side to the receiving jig 210 side. The presser foot force is added. The set position of the presser jig 220 is set to the front end side of the second surface 151b so as not to hinder the later-described laser light irradiation. Further, in the presser jig 220, a notch 220a is provided in advance at a portion corresponding to the convex part 141d so that the presser jig 220 and the convex part 141d do not interfere with each other. The bottom surface 141c and the first surface 151a are pressure-bonded by the receiving jig 210 and the holding jig 220.

  Next, the laser beam for laser welding is irradiated from the outer side of the plate-shaped part 151 aiming at the center part of the bottom face 141c. The laser light passes through the light-transmitting plate-like portion 151 and reaches the bottom surface 141c. The light-absorbing bottom surface 141c is melted by absorbing the thermal energy of the laser light. Furthermore, the heat at the time of melting is also transmitted to the plate-like portion 151 side, and the first surface 151a is also melted. In this way, a melt pool is formed between the bottom surface 141c and the first surface 151a by the laser light, and both surfaces 141c and 151a are welded. The welding is performed over the entire circumference of the first flange portion 141 by sequentially moving the irradiation position of the laser beam.

2. Second step (welding of the first flange portion and the second flange portion, FIG. 6)
The presser force by the presser jig 220 used at the time of welding is released, and the presser jig 220 is moved with respect to the receiving jig 210 to be in a standby state.

  Next, the second flange portion 111 (inlet side case 11) is set in the first flange portion 141 (outlet side case 14). At this time, for example, by using a positioning portion (not shown) provided in advance in the first flange portion 141 and the second flange portion 111, the second flange portion 111 is made to the first flange portion 141 and the plate-like portion 151. Is positioned. The first contact surface 141a and the second contact surface 111a are in contact with each other. Further, a gap 152 is formed between the second surface 151b and the facing surface 111c.

  The second surface 151b protrudes from the first contact surface 141a, and a step portion 111d is formed between the second contact surface 111a and the recess 111b. Therefore, the second flange portion 111 may be positioned with respect to the first flange portion 141 and the plate-like portion 151 by setting the step portion 111d so as to be aligned with the longitudinal end portion of the plate-like portion 151. good.

  Next, a pressing jig 230 different from the pressing jig 220 is set on the outer surface of the second flange portion 111. That is, the side surface 141e opposite to the first flange portion 141 and the outer side surface of the second flange portion 111 are sandwiched between the receiving jig 210 and the holding jig 230, and the holding jig 230 causes the receiving jig 210 to move to a predetermined side. Add the presser foot force. In addition, the set position of the holding jig 230 is set to the front end side of the second flange portion 111 so as not to prevent the irradiation of laser light to be described later. By the receiving jig 210 and the pressing jig 230, the first contact surface 141a and the second contact surface 111a are pressure-bonded.

  The presser jig 230 may also be used by the presser jig 220 by moving the presser jig 220 described in the first step.

  Next, a laser beam for laser welding is irradiated from the outside of the second flange portion 111 aiming at the central portion of the first contact surface 141a. Here, the energy of the laser beam in this step is set to be the same as the energy of the laser beam in the first step. Similarly to the first step, the laser light passes through the light transmissive second flange portion 111 and reaches the first contact surface 141a. The light absorbing first contact surface 141a is melted by absorbing the thermal energy of the laser beam. Furthermore, the heat at the time of melting is transmitted also to the second contact surface 111a side, and the second contact surface 111a is also melted. Thus, a melt pool is formed between the first contact surface 141a and the second contact surface 111a by the laser beam, and the both contact surfaces 141a and 111a are welded. The welding is performed over the entire circumference of the first flange portion 141 by sequentially moving the irradiation position of the laser beam. In addition, the convex part 141d formed in the 1st contact surface 141a is in the state crushed by said crimping | compression-bonding and welding.

  As described above, in the present embodiment, the second surface 151b protrudes closer to the second flange portion 111 than the first contact surface 141a. Therefore, when laser welding the first flange portion 141 and the plate-like portion 151, the first flange portion 141 and the plate-like portion 151 are sandwiched between the receiving jig 210 and the holding jig 220, and the bottom surface 141c of the housing recess 141b When pressing the first surface 151a of the plate-like portion 151, the presser jig 220 does not hit the first contact surface 141a. Accordingly, the bottom surface 141c and the first surface 151a can be securely bonded to each other.

  In this state, the bottom surface 141c is melted by irradiating laser light from the plate-shaped portion 151 side, and the first surface 151a is also melted by the heat at the time of melting, so that the bottom surface 141c and the first surface are melted. 151a can be reliably welded.

  In the present embodiment, a gap 152 is formed between the second surface 151b and the facing surface 111c. Therefore, when laser welding the first flange portion 141 and the second flange portion 111, the first flange portion 141 and the second flange portion 111 are sandwiched between the receiving jig 210 and the holding jig 230 (220), and the first contact is made. When the contact surface 141a and the second contact surface 111a are pressure-bonded, the opposing surface 111c does not hit the second surface 151b. Therefore, the first contact surface 141a and the second contact surface 111a can be reliably crimped.

  In this state, the first contact surface 141a is melted by irradiating laser light from the second flange portion 111 side, and further, the second contact surface 111a is also melted by the heat at the time of melting. The first flange portion 141 and the second flange portion 111 can be reliably welded.

  In general, in the laser welding structure 100 in which the first flange portion 141 and the second flange portion 111 are laser-welded and the first flange portion 141 and the plate-like portion 151 are laser-welded, a highly reliable welding state is achieved. It can be secured.

  In the present embodiment, the thickness dimension tf of the second flange portion 111 corresponding to the second contact surface 111a and the thickness dimension tp of the plate-like portion 151 are set to be the same. Thereby, the energy of the laser beam applied to the bottom surface 141c in the first step and the energy of the laser beam applied to the first contact surface 141a in the second step are made the same, and the respective parts are welded. It becomes possible. Therefore, the condition setting at the time of welding can be simplified.

  In the present embodiment, the first contact surface 141a is formed with a convex portion 141d that protrudes toward the second contact surface 111a, and the convex portion 141d is connected to the first contact surface 141a and the second contact surface 141a. It is crushed by laser welding with the contact surface 111a. Thereby, a state without a gap is formed between the first contact surface 141a and the second contact surface 111a, and a seal structure with the crushed convex portion 141d can be formed. The sealing performance between 141a and 111a can be improved.

  In the present embodiment, in the first flange portion 141, the opposite side surface 141e that is opposite to the first contact surface 141a and the housing recess 141b is formed as one flat surface. Thereby, when welding the 1st flange part 141 and the plate-shaped part 151, and when welding the 1st flange part 141 and the 2nd flange part 111, the receiving jig 210 is a simple shape without a step part. Therefore, since it can be made the same thing, jig costs can be reduced.

(Other embodiments)
In the first embodiment, the thickness dimension tf of the second flange portion 111 corresponding to the second contact surface 111a and the thickness dimension tp of the plate-like portion 151 are made the same. However, if the energy of the laser beam is adjusted in the first step and the second step so as to cope with them, both thickness dimensions may be set differently.

  Moreover, although the convex part 141d was provided in the 1st contact surface 141a, you may make it provide this convex part 141d in the 2nd contact surface 111a side. Further, when the sealing property between the both contact surfaces 141a and 111a can be sufficiently secured by laser welding of the first contact surface 141a and the second contact surface 111a, the convex portion 141d may be eliminated. .

  Further, in the first flange portion 141, the opposite side surface 141e is formed to be a single flat surface, but may be a stepped surface corresponding to the first contact surface 141a and the housing recess 141b. good. In this case, the receiving jig 210 may be formed with a step corresponding to the stepped surface, or the receiving jig 210 may be moved between the first step and the second step. It is.

  Moreover, although this laser welding structure 100 was demonstrated as what is applied to the evaporative fuel purge apparatus 10, it is not restricted to this, It can apply widely with respect to what welds three members which form the same welding part. it can.

10 Evaporative fuel purging device 11 Inlet side case (second member)
14 Outlet side case (first member)
15 Partition plate (third member)
100 Three-member laser welding structure 111 2nd flange part, 111a 2nd contact surface, 111c opposing surface 141 1st flange part, 141a 1st contact surface, 141b accommodation recessed part,
141c bottom surface, 141d convex portion 151 plate-like portion, 151a first surface, 151b second surface 152 gap portion

Claims (4)

A lower case (14) formed with a first flange portion (141) projecting outward at the outer peripheral portion;
An upper case (11) formed with a second flange portion (111) projecting outward at the outer periphery so as to face the first flange portion (141);
A plate-like portion (151) having a plate shape is formed at the outer peripheral portion, and the plate-like portion (151) is disposed between the first flange portion (141) and the second flange portion (111). A partition plate (15),
The first flange portion (141) is formed from a light-absorbing resin, and the second flange portion (111) and the plate-like portion (151) are formed from a light-transmitting resin.
An accommodation recess (141b) for accommodating the plate-like portion (151) is formed in an inner region in the extending direction of the first flange portion (141),
A first contact surface (141a) formed on the second flange portion (111) side in an outer region of the first flange portion (141) in the overhang direction, and an extension region of the second flange portion (111) in the overhang direction. The second contact surface (111a) formed on the first flange portion (141) side in the outer region is laser-welded,
Laser welding of three members in which the bottom surface (141c) of the accommodating recess (141b) and the first surface (151a) on the first flange portion (141) side of the plate-like portion (151) are laser-welded. In structure
A second surface (151b) of the plate-like portion (151) on the second flange portion (111) side protrudes toward the second flange portion (111) side than the first contact surface (141a). And the second flange portion is formed with a recess (111b) that is recessed from the second contact surface in an inner region in a protruding direction from the second contact surface.
A gap (152) is formed between the second surface (151b) and the opposing surface (111c) of the second flange portion (111) facing the second surface (151b). A three-member laser welding structure characterized in that:   The thickness dimension (tf) of the second flange portion (111) corresponding to the second contact surface (111a) and the thickness dimension (tp) of the plate-like portion (151) are set to be the same. The three-member laser welding structure according to claim 1, wherein: On either one of the first contact surface (141a) or the second contact surface (111a), a convex portion (141d) protruding to the other side is formed,
The said convex part (141d) is crushed by the laser welding of the said 1st contact surface (141a) and the said 2nd contact surface (111a), The Claim 1 or Claim 2 characterized by the above-mentioned. 3 member laser welding structure.   The surface of the first flange portion (141) opposite to the first contact surface (141a) and the receiving recess (141b) is formed as one flat surface. The three-member laser welding structure according to any one of claims 1 to 3.

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