JP7074316B2 - Joining members, joining methods and joining bodies - Google Patents

Description

The present invention relates to a joining member, a joining method and a joined body used for press-fitting and joining a metal member.

Conventionally, in joining metal members to each other, there is a so-called press-fitting method in which the other metal member is pressed and fitted into a hole provided in one metal member. Further, in order to firmly fit the metal members to each other, a protrusion (serration) is formed on the peripheral surface of one member (for example, a shaft member), and when the metal member is press-fitted into a hole provided in the other member, the protrusion is formed. There is also known a technique of deforming a part of a strip or engraving a groove on the inner peripheral surface of a hole by a ridge to fit the strip (see, for example, Patent Document 1). As the pattern of the ridges, those formed in a direction along the axis of the shaft member or in a direction inclined with respect to the shaft are known (see, for example, Patent Document 2).

Japanese Patent No. 3402036 Japanese Unexamined Patent Publication No. 2004-293714

However, in particular, in the case of press-fitting in a tight-fitting state (fitting with a tight fit) when the fitting is not fixed and disassembled once it is fitted, the pressing direction (for example, a shaft such as a shaft member) is used as in the conventional case. In the case of a configuration in which a large number of ridges along the direction) or ridges inclined with respect to the pressing direction (for example, the axial direction) are provided, there is a limit to the improvement of the pull-out load (improvement of the pull-out force and the difficulty of pulling out). there were.

Specifically, when the hardness of one metal member is high and the hardness of the other metal member is low, or when the member is fitted into a housing having a predetermined shape, the metal members are tightly fitted to each other. There is a problem that a large dimensional difference cannot be secured, and as a result, the extraction force cannot be increased (the resistance to a high extraction force is low).

Further, when the hardness of one metal member is high and the hardness of the other metal member is low, the metal member having the lower hardness may be destroyed, so that the load that can be press-fitted is also limited. For this reason, for example, in the case of joining stainless steel and aluminum, a certain degree of joining strength is maintained by quenching the stainless steel, press-fitting both, and then performing laser welding. In addition to the complicated process, there is a limit to the improvement of the joining strength and the pulling force.

In view of such circumstances, the present invention has increased the pull-out force by a sufficient retaining structure in the joining member to be joined by press-fitting in a tight-fitting state (for example, a pull-out load in the axial direction). It is intended to provide a joining member, a joining method and a joined body (which is made difficult to come off by increasing the rotational torque strength).

The present invention has a first metal member and a second metal member, and is a joining member used for joining by press fitting, and the second metal member is more deformed than the first metal member. The first metal member is an easy member, and the first metal member is provided with a plurality of protrusions protruding in the direction of the second metal member on the contact surface with the second metal member, and the protrusions are the first metal member. Includes a restricted portion that regulates the advance of the press fit in the pressing direction and in the direction inclined with respect to the pressing direction when fitted with the second metal member, and the adjacent protrusions are the respective such restrictions. The joining member is characterized in that the portions are arranged apart from each other so as not to overlap in the pressing direction, and each of the protrusions includes an inclined portion having an angle formed by the pressing direction of more than 30 degrees .

Further, the present invention is a joining method using the above-mentioned joining member, in which the first metal member and the second metal member are overlapped and pressed, and a part of the second metal member is formed by the protrusion. It is a joining method characterized by deforming and fitting the two together.

Further, the present invention is a joined body joined by the above-mentioned joining member.

Further, the present invention is a joined body joined by the above-mentioned joining method.

According to the present invention, in a joint member joined by press fitting in a tightly fitted state (fitting with a tight fit), the resistance to pulling force is enhanced by a sufficient retaining structure (for example, axial pulling load and rotation). It is possible to provide a joining member, a joining method, and a joined body (which have increased torque strength to prevent them from coming off).

It is a figure which shows the joining member of embodiment of this invention, (a) is the top view of the first metal member, (b) is the side view of the first metal member, (c) is the second metal member. It is a top view of the above, and (d) is a side view of the second metal member 21. It is a figure which shows the joining member of embodiment of this invention, (a) is the top view of the first metal member, (b) is the side view of the first metal member. It is a figure which shows an example of the joining method by the joining member of this embodiment, (a) is a side view, (b) is a side view, (c) is a top view of (b). It is a side view explaining the 1st metal member of this embodiment and a comparative example. It is a conceptual diagram explaining the junction and the comparative example of this embodiment. , Is an enlarged conceptual diagram in the vicinity of the protrusion in FIG. 5 (b). It is a side view which shows the other example of the protrusion of this embodiment. It is a figure which shows the other embodiment of this invention. It is a figure which shows the other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 are views showing the joining member 10 of the present embodiment, FIGS. 1 (a) and 2 (a) are top views of the first metal member 11, and FIGS. 1 (b) and 2 (b) are views. 2 (b) is a side view of the first metal member 11, FIG. 1 (c) is a top view of the second metal member 21, and FIG. 1 (d) is a side view of the second metal member 21. In each of the following figures, the main components are exaggerated for convenience of explanation.

The joining member 10 is composed of a first metal member 11 and a second metal member 21 that are joined by press fitting in a tightly fitted state (fitting with a tight fit).

The first metal member 11 and the second metal member 21 are different types of metal members, and the second metal member 21 is a member that is more easily deformed than the first metal member 11. Here, "easily deformed" means, for example, that it is easily deformed by at least elastic deformation, or that it is easily deformed by plastic deformation (in addition to elastic deformation) or by carving (cutting) a groove. .. As an example, the hardness of the second metal member 21 is lower than the hardness of the first metal member 11, specifically, the first metal member 11 is stainless steel and the second metal member 21 is. It is aluminum. Further, here, as an example, a case where the first metal member 11 is press-fitted into the hole portion 24 of the second metal member 21 will be described.

As shown in FIGS. 1A and 1B, the first metal member 11 has, for example, pressing surfaces 12A and 12B, a side surface 13, and a substantially cylindrical shape (ring shape) having a hole portion 14. The pressing surfaces 12A and 12B are surfaces that are directly subjected to pressing pressure, and the side surface (peripheral surface) 13 is a contact surface with the second metal member 21. The peripheral surface (in this example, the outer peripheral surface) 13 is provided with a plurality of linear protrusions 15 (three in this example) protruding in the direction of the second metal member 21 when press-fitted. Here, in the following description, for convenience, the direction perpendicular to the pressing surfaces 12A and 12B (the plate thickness direction of the first metal member 11) is referred to as the (cylindrical) axial direction V, and the pressing surface 12A. , The direction horizontal to 12B is called the radial direction H, and the direction along the peripheral surface (outer peripheral surface) 13 is called the circumferential direction R.

The protrusion 15 has a tip portion 15T that projects at an acute angle from the axial center of the cylinder toward the outside in the radial direction H in the top view shown in FIG. In the side view shown in (1), the tip portion 15T is formed in a linear shape extending in a direction different from the axial direction V.

More specifically, the protrusion 15 extends from the pressing surface (upper surface) 12A to reach the pressing surface (lower surface) 12B, but with the position (for example, the position of the starting point) P1 of the tip portion 15T on the pressing surface 12A. , The position of the tip portion 15T on the pressing surface 12B (for example, the position of the end point) P2 is inclined with respect to the axial direction V so as to be displaced in the circumferential direction R, and is curved in one direction in the plan view of the outer peripheral surface 13. It is formed in a curved shape (arc shape) (curved so as to be convex toward the right side in the radial direction H in the figure (b)).

Further, as shown in FIG. 1 (a), the protrusions 15 are (omitted) provided at three places, for example, spaced apart at equal intervals. Note that FIG. 3B is a schematic diagram for convenience of explaining adjacent protrusions 15, and does not correspond to the position of the protrusions 15 shown in FIG. Further, the adjacent protrusions 15 are arranged apart from each other so as not to overlap each other in the axial direction V (or the circumferential direction R). Specifically, the protrusion 15 is formed in an arc shape in which the position of the start point P1 and the position P2 of the end point are displaced in the circumferential direction R, and one protrusion 15 exists over the arrangement region DR in a predetermined range in the circumferential direction R. ing. Then, the protrusions 15 are arranged apart from each other so that none of the other protrusions 15 exist in the arrangement region DR of one protrusion 15.

As shown in FIGS. (C) and (d), the second metal member 21 has, for example, pressing surfaces 22A and 22B, side surfaces 23, and a hole 24 in the center (omitted). (Ring shape), the pressing surfaces 22A and 22B are surfaces that directly receive pressing pressure, and the inner peripheral surface (peripheral surface and inner peripheral surface of the hole 24) 25 of the side surface 23 is the first metal member. It becomes a contact surface with 11.

With reference to FIG. 2, the protrusion amount (distance from the outer peripheral surface 13 to the tip portion 15T) D of the protrusion 15 of the first metal member 11 is, for example, the size (outer diameter d1) of the pressing surface 15A (15B). It is about 0.1% to 0.5%.

As described above, in the drawings, the protrusions 15 are exaggerated for convenience of explanation, but in reality, the ratio of the protrusions 15 to the size (diameter) of the first metal member 11 is not shown. Differently, the protrusion 15 is very fine with respect to the size (diameter) of the first metal member 11.

As an example, when the outer diameter d1 of the pressing surface 15A is, for example, about 25 mm, the protrusion amount D is about 50 μm. Further, the protrusion 15 is an arc shape having a curvature larger than 0 but having a relatively small curvature, and the inclination angle with respect to the axial direction V is, for example, 50 as the angle α of the tangential line of the arc at the center position in the axial direction V (plate thickness direction). It is about the degree.

Further, the margin between the first metal member 11 and the second metal member 21 is the diameter dimension (outer diameter d1-inner diameter of the second metal member 21 (diameter of the hole 24) of the first metal member 11). As d3), for example, it is about 15 μm to 30 μm.

FIG. 3 is a diagram showing an example of a joining method using the joining member 10 of the present embodiment, where FIGS. (A) and (b) are side views, and FIG. 3 (c) is the figure (b). It is a top view of.

In the joining method of the present embodiment, first, the second metal member 21 is placed on the die 41 of the press-fitting machine or the press machine, and the first metal member 11 is placed (laminated) on the die 41 of the press-fitting machine or the press machine. The pressing surface (for example, pressing surface 12A) of one metal member 11 is pressed by the punch 42 (FIG. 3A).

At this time, the first metal member 11 is pushed into the hole 24 of the second metal member 21 while rotating in a spiral along the protrusion 15 provided in an arc shape. Here, since the second metal member 21 is more easily deformed than the first metal member 11, the second metal member 21 is at least elastically deformed, or is plastically deformed in addition to the elastic deformation, and the protrusions 15 are formed. It is deformed so that a part of the inner peripheral surface 25 of the second metal member 21 is scraped off (so that a groove is carved), and the protrusion 15 and the inner peripheral surface 25 of the second metal member 21 are formed. Is firmly fitted (fitted). In this way, the first metal member 11 and the second metal member 21 are joined by press fitting in a tightly fitted state (fitting with a tight fit), and the first metal member 11 is formed on the outer peripheral surface 13 thereof. , A bonded body 30 is formed in contact with the inner peripheral surface 25 of the hole 24 of the second metal member 21 (FIG. (B), FIG. (C)).

The size of each member including the number of protrusions 15 and the protrusion amount D is an example, and these are the materials, plate thickness, diameter, and further of the first metal member 11 and the second metal member 12. It is appropriately selected according to the required bonding strength and pulling force.

The number of protrusions 15 may be a plurality, but three or more are desirable in consideration of stability when the first metal member 11 is placed on the second metal member 21 and pressed. ..

As described above, in the present embodiment, arc-shaped protrusions 15 are provided on the peripheral surface (outer peripheral surface) 13 of the first metal member 11 which is difficult to be deformed so as not to overlap each other in the circumferential direction R (and the axial direction V). The first metal member 11 is press-fitted into the hole 24 of the second metal member 21 which is easily formed and deformed by tight fitting to form a bonded body 30. As a result, the joined body 30 can significantly increase the pulling load (pulling force) as well as the joining strength.

Hereinafter, this will be described with reference to FIGS. 4 to 6. According to the present embodiment, first, it is considered that the pulling force can be increased by the number and arrangement of the protrusions 15.

FIG. 4 is a side view showing a comparative example with the first metal member 11 of the present embodiment. 4 (a) and 4 (b) are examples of the first metal members 50 and 52 which are comparative examples of the first metal member 11, and FIG. 4 (a) is linear along the axial direction V. It is a side view of the first metal member 50 which formed a plurality of protrusions (protrusions) 51 of. Further, in the figure (b), a plurality of linear protrusions (protrusions) 53 inclined with respect to the axial direction V are formed, and the adjacent protrusions 53 partially overlap each other in the circumferential direction R (axial direction V). It is a side view of the first metal member 52 arranged in. For example, in this example, the entire protrusion 53 (53A) is located over the placement region DR, but the placement region DR is a part of other protrusions 53 (53B, 53C) adjacent to the left and right. Are arranged so as to overlap one protrusion 53A in the circumferential direction R (axial direction V).

Further, FIG. 3C is a side view of the first metal member 11 forming the protrusion 15 of the present embodiment. The first metal members 50, 52, and 11 shown in FIG. 4 all have the same configuration except for the protrusions, and the second metal member 21 for press-fitting the first metal members 50, 52, and 11 has the same configuration. The configuration is the same as in FIG. 1 (c) and FIG. 1 (d).

FIG. 5 is a conceptual diagram showing a comparative example with the bonded body 30 of the present embodiment. FIG. 4A is a conceptual diagram of the upper surface of the bonded body 60 formed by press-fitting the first metal member 52 shown in FIG. 4B into the second metal member 54, and FIG. 4B is the present implementation. It is a top surface conceptual diagram of the joint body 30 of a form. The case of the first metal member 50 shown in FIG. 4A is the same as that in FIG. 5A.

Further, FIG. 6 is an enlarged conceptual diagram in the vicinity of the protrusion 15 in FIG. 5 (b). As described above, the protrusion 15 is exaggerated in each drawing of the present embodiment, and the actual shape is close to that of FIG. 6 (again, the actual protrusion 15 and the first metal member). The ratio of the curvature of the outer diameter of 11 is also different from that shown in FIG. 6). FIG. 6 is an enlarged upper surface schematic view of the vicinity of the protrusion 15 in FIG. 5, and the formation positions of the protrusion 15 along the axial direction V (plate thickness direction) are sequentially shifted and described.

In the press-fitting bonding of the present embodiment, the second metal members 21 and 54 are more easily deformed than the first metal members 11 and 53, and more specifically, for example, the hardness is low. That is, the second metal members 21 and 54 are at least elastically deformed by press fitting and come into close contact with the first metal members 11 and 53, and in addition to this, a part may be plastically deformed. Is considered to be.

In this case, paying particular attention to elastic deformation, in the comparative example, as shown in FIG. 5A, when the first metal member 52 (50) is press-fitted, the tip of the protrusion 53 (51) becomes the second tip. The second metal member 54 is pressed to the outside in the radial direction H as shown by a single arrow in contact with the metal member 54 by a point (line). Further, the region between the protrusions 53 is pressed so as to spread the second metal member 54 in the circumferential direction R as indicated by the double-headed arrow. As described above, when the number of protrusions 53 is large, the point (line) contact at the tip thereof is large, and conversely, the surface contact between the protrusions 53 is small.

Then, since a large number of protrusions 53 are pressed outward in the radial direction as a whole as shown by a single arrow, the amount of elastic deformation (distributed elastic deformation amount) in the vicinity of each protrusion 53 is shown by a broken line. It becomes smaller and it becomes difficult to deform each flexibly. Further, it is considered that even in the region between the protrusions 53, the region that is actually in surface contact is further reduced and the adhesion is lowered.

Further, as shown in FIG. 4 (b), in the arrangement region DR of a certain projection 53A, when the adjacent projections 53B and 53C are arranged so as to overlap each other along the circumferential direction R (axial direction V). Originally, a part of the area of surface contact between the protrusions 53 also becomes point (line) contact at the tip of the protrusion 53, and the area of surface contact is further reduced.

On the other hand, in the present embodiment, as shown in FIGS. 5 (b) and 6, the point (line) contact at the tip 15T of the protrusion 15 is much less than that in the figure (a), and conversely, the protrusion 15 The surface contact between them becomes much larger. Further, since the number of protrusions 15 is small and the amount of pressing outward in the radial direction H is small as a whole, the elastic deformation amount (dispersed elastic deformation amount) in the vicinity of each protrusion 15 can be sufficiently secured. That is, as shown by the broken line, each has a gentle and flexible deformation (for example, in the vicinity of the protrusion 15, it expands and contracts toward the protrusion 15, and between the protrusions 15, the first metal member 11 and the second metal member 21 It can be said that deformation) is possible so that the contact surfaces are in close contact with each other.

Further, as shown in FIG. 1B in particular, in the arrangement region DR of a certain protrusion 15, adjacent protrusions 15 do not overlap with each other along the circumferential direction R (axial direction V), so that the surfaces between the protrusions 15 are not overlapped with each other. A sufficient contact area can be secured.

That is, in the case of the present embodiment, as compared with the configuration shown in FIG. 5A, the second metal member 21 is gently elastically deformed in the vicinity of the individual protrusions 15 while suppressing the overall amount of deformation. Moreover, the structure is such that a sufficient area for surface contact can be secured. Therefore, it is considered that the adhesion between the first metal member 11 and the second metal member 21 is improved and a high pulling force can be withstood.

Further, when considering the state of close contact due to elastic deformation with reference to FIG. 4, in the case of the first metal member 50 shown in FIG. 4A, the second metal member 54 is elastically deformed by press fitting. However, although it is in close contact with the first metal member 50 along the protrusion 51 as shown by hatching, the extending direction of the protrusion 51 coincides with the axial direction V, and the first metal member 50 Traveling in the axial direction V (indicated by the arrow) is not regulated at all. Therefore, for example, on the premise that the second metal member 54 is not destroyed, if a force exceeding the bonding strength is applied in the axial direction V (pushing direction at the time of press fitting or the opposite direction), the first metal member 50 becomes the second metal. It will be removed from the member 54.

The same applies to the case of the first metal member 52 shown in FIG. 3 (b), in which the second metal member 54 is elastically deformed by press fitting, and the first metal member 54 is elastically deformed along the protrusion 51 as shown by hatching. Although it is in close contact with the metal member 52, the advance of the protrusion 53 of the first metal member 52 in the extending direction (indicated by an arrow) is not restricted at all. Therefore, for example, on the premise that the second metal member 54 is not destroyed, if a force exceeding the joining strength is applied in the extending direction of the protrusion 53 (the pushing direction at the time of press fitting or the opposite direction), the first metal member 52 becomes the first metal member 52. It will be removed from the second metal member 54.

On the other hand, as shown in FIGS. (C) and 6, the protrusions 15 of the present embodiment are formed in an arc shape in a plan view (side view) of the outer peripheral surface 13 of the first metal member 11. Then, the second metal member 21 is elastically deformed by press fitting, and is in close contact with the first metal member 11 along the protrusion 15 as shown by hatching.

In this case, in order to remove the first metal member 11 from the second metal member 21, the direction inclined with respect to the axial direction V or the axial direction V as shown by the arrow (the pushing direction at the time of press-fitting or the opposite direction). Even when it is moved to, the progress is restricted by the contact of any portion PX of the arcuate protrusion 15 with the second metal member 21.

That is, the protrusion 15 formed on the first metal member 11 of the present embodiment has the first metal member 11 fitted to the second metal member 21 in the pressing direction (axial direction V) and the pressing direction. It contains a regulatory site PX that regulates linear travel in the direction of inclination.

Therefore, even when the first metal member 11 is to be removed from the second metal member 21, the regulation portion PX regulates the progress of the first metal member 11. The force for removing the first metal member 11 from the second metal member 21 can be significantly improved as compared with the conventional case.

Although only a few points of the restricted portion PX are shown in the figure (c), when the protrusion 15 is formed in an arc shape, the entire projection 15 is inclined with respect to the pressing direction (axial direction V) and the pressing direction. It is a regulated site PX that regulates linear progress in (at least one of the tilting directions).

Specifically, for example, assuming that the conditions other than the shapes of the protrusions 15, 51 and 53 are the same, the pulling force when the protrusions 51 and 53 shown in FIGS. When the pull-out load) is, for example, 20 kg to 30 kg, it can be improved to 200 kg to 300 kg by using the pattern of the protrusion 15 of the present embodiment.

Although the elastic deformation of the second metal member 21 (54) has been mainly described here, the second metal member 21 has a part of plastic deformation and / or a groove along the protrusion 15 in addition to the elastic deformation. It may be fitted (fitted) with the first metal member 11 by engraving or the like.

FIG. 7 is a side view showing another example of the protrusion 15.

The protrusion 15 regulates that the first metal member 11 fitted to the second metal member 21 advances linearly in the pressing direction (axial direction V) and in the direction inclined with respect to the pressing direction. As long as the site PX is included, the present invention is not limited to the above example.

For example, as shown in FIG. 6A, the protrusion 15 may be a protrusion 15 inclined with respect to the axial direction V from the upper and lower pressing surfaces 12A and 12B toward the center of the plate thickness, respectively. In this case, the protrusion 15A from one pressing surface 12A toward the center of the plate thickness and the protrusion 15B from the other pressing surface 12B toward the center of the plate thickness are axially V so as not to exist in the extending direction of each other. It is formed at a position moved in parallel with. As a result, the protrusions 15A and 15B both have the end portion on the center side of the plate thickness as the regulation portion PX.

In this case, although they overlap in the circumferential direction, the lengths of the protrusions 15A and 15B are short, so that a sufficient surface contact area can be secured.

Further, as shown in FIG. 3B, although the protrusion 15 is arcuate, it is formed so that one of the extending ends (for example, the end point P2) does not reach the pressing surface (for example, the pressing surface 12B). You may. In the case of an arc shape, the restricted portion PX exists as a whole, but with this shape, when the second metal member 21 is scraped off by press fitting, the shavings can be prevented from being discharged to the outside.

FIG. 8 is an example in which the first metal member 11 and the second metal member 21 are replaced. FIG. 2A is a top view of the second metal member 21, FIG. 2B is a top view of the first metal member 11, and FIG. 3C is a joint formed by press-fitting both. It is a top view of the body 30, and the figure (d) is a side view of the joined body 30.

As shown in FIG. 8, a hole 17 may be formed in the first metal member 11 which is hard to be deformed, and a second metal member 21 which is easily deformed may be press-fitted into the hole 17.

In this case, the first metal member 11 projects toward the peripheral surface (inner peripheral surface) 18 of the hole portion 17 which is the contact surface of the second metal member 21 in the direction (inside) of the second metal member 21. The protrusion 15 is formed. The side view pattern of the protrusion 15 is the same as that in FIGS. 1 and 5.

Even in this case, the protrusion 15 has a regulation portion PX that regulates the linear progress in the pressing direction (axial direction V) and the direction inclined with respect to the pressing direction, and the number of protrusions 15 is large. Since there are few and a large surface contact can be secured, the adhesion to the second metal member 21 can be improved, and a high pull-out force can be withstood.

FIG. 9 is a side view showing another embodiment of the first metal member 11. The first metal member 11 is provided with a protrusion 15 projecting in the direction of the second metal member 21 on a contact surface with the second metal member 21, and the protrusion 15 at least partially forms a part of the second metal member 21. It is not limited to the above example as long as it is elastically deformed.

For example, as shown in FIG. 9A, a single protrusion 15 may be provided on the outer peripheral surface of the first metal member 11. The protrusions 15 are provided in an annular shape continuous in the circumferential direction R along the outer peripheral surface of the first metal member 11. More specifically, the protrusion 15 protrudes in the radial direction H from the base point S1 of one of the protrusions toward the tip portion 15T (on the upper side in the axial direction V in the figure) so as to be substantially the same position in the axial direction V (tip). The portion 15T projects radially (omittedly) horizontally from the base point S1 of one protrusion), and the other base point S2 extends to the end portion (lower end portion in the figure) of the first metal member 11 in the axial direction V. It may be formed so as to be positioned, and may have a wedge shape having a gently tapered shape from the tip portion 15T to the starting point S2 (tip in the press-fitting direction). In this case, for example, the radial positions of the base point S1 and the base point S2 are (omitted) the same position as shown by the broken line.

Further, in the case of the first metal member 11 having the wedge-shaped protrusion 15 as shown in FIG. 6A, the first metal member 11 (the same) as shown in FIGS. The plate thickness (thickness in the axial direction V) in FIGS. (B) and (d) is made smaller than the plate thickness in the second metal member 21 (FIGS. (C) and (d)), and the second It is preferable to provide a support portion 27 for supporting the first metal member 11 on the inner peripheral surface 25 of the hole portion 24 of the metal member 21 in the above, because it is possible to prevent the metal member 21 from coming off in the axial direction. The support portion 27 is provided on the inner side (axis center side) in the radial direction from the inner peripheral surface 25 of the second metal member 21 so that the bottom portion of the first metal member 11 can be supported ((d) in the figure). Protrude.

In the case of the wedge-shaped protrusion 15 as shown in FIGS. Since the taper is gentle up to, press-fitting is easy and press-fitting can be reduced. Further, since the protrusion 15 has a wedge shape, the pull-out load (pull-out force) in the press-fitting direction can be increased.

FIG. 3E is a wedge shape formed so that the other base point S2 of the protrusion is located in the middle of the axial direction of the first metal member 11 in the protrusion 15 shown in FIG. child

Even with the protrusion 15 in this case, the diameter becomes smaller toward the tip in the press-fitting direction (lower in the figure), and the taper from the tip in the press-fitting direction to the protrusion 15 (tip portion 15T) facilitates press-fitting (press-fitting). Input can be reduced). Since the protrusion 15 has a wedge shape in each case, the pull-out load (pull-out force) in the press-fitting direction can be increased.

Further, as shown in FIG. 5 (f), the wedge-shaped protrusions 15 shown in FIG. Is also good.

As shown in the figure (f), in the case of the wedge-shaped protrusion 15, the diameter becomes smaller toward the tip in the press-fitting direction (lower in the figure), and the taper from the tip in the press-fitting direction to the protrusion 15 (tip portion 15T) is gentle. Therefore, press-fitting can be facilitated and press-fitting can be reduced. Further, since the protrusion 15 has a wedge shape, the pull-out load (pull-out force) in the press-fitting direction can be increased.

In addition to this, the end of each protrusion 15 in the circumferential direction R serves as a regulated portion PX that regulates the rotation of the first metal member 11 in the circumferential direction R about the axis, and the first metal member 11 Can be prevented from rotating and coming off.

Further, as shown in the figure (g), the protrusion 15 has a configuration in which the tip portion 15T protrudes in the radial direction H so that the tip portion 15T is at a different position in the axial direction V from any of the base points S1 and S2 of the protrusion. May be good. In this case, the protrusions 15 may have a shape continuous in the circumferential direction R as shown in the figure (g), or may be separated into a plurality of protrusions 15 in the circumferential direction R, although not shown.

Further, in this case, the distances from the tip portion 15T of the protrusion 15 to the base points S1 and S2 are substantially equidistant in the axial direction V, but one of them may be longer.

Further, in this case, the tip portion 15T may have a configuration in which the position does not displace in the axial direction V ((g) in the figure), or the position displaces in the axial direction V (the tip portion 15T tilts in the side view). ) It may be configured.

Further, as shown in FIG. 3H, a plurality of protrusions 15 (or protrusions 15 shown in FIG. G) shown in FIG. 1A are combined in the axial direction of the first metal member 11. May be.

As described above, in the embodiment shown in FIG. 9, when the first metal member 11 is press-fitted into the second metal member 21, the second metal member 21 is at least elastically deformed, or is plastically deformed in addition to the elastic deformation. The protrusion 15 deforms so that a part of the inner peripheral surface 25 of the second metal member 21 is scraped off (so that a groove is carved), and the protrusion 15 and the inner peripheral surface of the second metal member 21 are deformed. The first metal member 11 is firmly fitted (fitted) with the 25, and a bonded body 30 is formed on the outer peripheral surface 13 of the first metal member 11 in contact with the inner peripheral surface 25 of the hole 24 of the second metal member 21. (See the figure (d)).

According to the configuration of the above embodiment, even when the plate thickness of the first metal member 11 and the second metal member 12 is the same as the conventional one, and the press-fitting input (press-fitting load) is the same as the conventional one. , The pull-out load (pull-out force) can be significantly increased as compared with the conventional case.

That is, if it is sufficient to maintain the same pull-out load (pull-out force) as in the conventional case, the plate thickness of the first metal member 11 and the second metal member 12 can be significantly reduced as compared with the conventional case, and the parts can be downsized (lightweight). Can contribute to the conversion.

In addition, by reducing the size and weight of the parts, the cost can be reduced and the degree of freedom in layout is improved.

Further, in the past, an adhesive may be used to improve the pulling force, but the pulling force can be improved without using the adhesive.

In addition, the press-fitting machine can be downsized (labor saving).

In the joining member and joining method of the present embodiment, for example, a component (for example, an engine head, a die-cast product, a bearing component, or the like) in which the first metal member 11 is formed in a ring shape and the second metal member 21 is formed. A ring-shaped first metal member 11 can be press-fitted into a portion of the press-fitted component) where strength is required as reinforcement.

The joint body 30 was formed by the joint member 10 shown in FIG. 9 (a), and the pressure input and the pull-out force were compared with the joint body of the comparative example in which the protrusion 15 was not provided.

In the joint body 30 of this embodiment, the material of the first metal member 11 is carbon tool steel, and the plate thickness is 5.7 mm. The material of the second metal member 21 is aluminum.

In the bonded body of the comparative example, the protrusion 15 is not provided, the material of the inner metal member (the member corresponding to the first metal member of the present embodiment) is an iron-based sintered metal, and the outer metal member. The material of (the member corresponding to the second metal member 21 of this embodiment) is the same aluminum as that of this embodiment. In addition, other configurations (shapes such as plate thickness, outer diameter, inner diameter, and squeeze margin) are the same in both cases.

The press-fitting load (pressure input) and the pull-out load (pull-out force, pull-out strength) were measured for the joined body 30 of this example and the joined body 60 of the comparative example. The joint of the comparative example had a press-fitting load of 190 kgf and a withdrawal strength of 190 kgf. On the other hand, in the bonded body 30 of the present embodiment, the press-fitting load was 200 kgf and the extraction strength was 520 kgf.

From this result, according to the present invention, the plate thickness of the first metal member 11 and the second metal member 12 is the same as the conventional one, and the press-fitting input (press-fitting load) is the same as the conventional one. However, it was clarified that the pull-out load (pull-out force) can be significantly increased as compared with the conventional case.

That is, if it is sufficient to maintain the same pull-out load (pull-out force) as in the conventional case, the plate thickness of the first metal member 11 and the second metal member 12 can be significantly reduced as compared with the conventional case, and the parts can be downsized (lightweight). It can be said that it can contribute to the conversion.

The present invention can be used for joining a plurality of members.

10 Joining member 11 First metal member 15 Protrusion 21 Second metal member 30 Joining body

Claims (10)

A joining member having a first metal member and a second metal member and used for joining by press fitting .
The second metal member is a member that is more easily deformed than the first metal member.
The first metal member is provided with a plurality of protrusions protruding in the direction of the second metal member on the contact surface with the second metal member.
The protrusion comprises a restricting portion that regulates the first metal member from advancing in the press-fitting pressing direction and in a direction inclined with respect to the pressing direction when the first metal member is fitted with the second metal member.
The adjacent protrusions are arranged apart from each other so that the respective regulation portions do not overlap in the pressing direction.
Each of the protrusions includes an inclined portion having an angle of greater than 30 degrees with the pressing direction.
A joining member characterized by that. The inclined portion is a curved portion, and the angle formed by at least one tangent of the curved portion and the pressing surface of the first metal member is about 50 degrees.
The joining member according to claim 1. The curved portion is curved in one direction in the plan view of the contact surface.
The joining member according to claim 2. The number of the protrusions is three.
The joining member according to any one of claims 1 to 3, wherein the joining member is characterized in that. The first metal member is a substantially columnar member.
The joining member according to any one of claims 1 to 4, wherein the joining member is characterized in that. A part of the second metal member is fitted by the protrusion while being deformed including at least elastic deformation.
The joining member according to any one of claims 1 to 5. A joining method using the joining member according to any one of claims 1 to 6.
The first metal member and the second metal member are overlapped and pressed, and a part of the second metal member is deformed by the protrusion to fit the two.
A joining method characterized by that. The first metal member or the second metal member is pressed while rotating along the forming direction of the protrusion.
The joining method according to claim 7. A joined body joined by the joining member according to any one of claims 1 to 6. A joined body joined by the joining method according to claim 7 or 8.

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