JP2000042845A - Inertial press-in method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inertial press-in method having a high sealing property at a gap between a fitting projected part an a fitting recessed part which are given inertial press-in. SOLUTION: A plurality of peripherally continuous ring ribs 90 are formed in spaced intervals in the fitting directions of a fitting recessed part 82 and a fitting projected part 86 on the peripheral surface of the fitting projected part 86 of a second member 16 inertially pressed in the fitting recessed part 82 of a first member 12. Inertial movement presses the fitting projected part 86 in the fitting recessed part 82. The ring ribs 90 are tightly fitted in the inner perimetral surface 84 of the fitting recessed part 82 to mutual deposition. A gap between the fitting recessed part 82 and the fitting projected part 86 is continuously sealed in the peripheral direction, resulting in yielding a high sealing property. Ribs extending in parallel with the fitting direction may be provided together with ribs for sealing. Meshed ribs instead of the ring ribs may be provided to allow to function as the ribs for sealing. Ring ribs may be provided on the inner perimetral surface of the fitting recessed part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an inertial motion of a member to which kinetic energy is applied among two members.
The present invention relates to an inertial press-fitting technique for press-fitting these two members with each other, and more particularly to improving the sealability of a fitting portion where two members are press-fitted and tightly fitted.

[0002]

2. Description of the Related Art 2
A first member that is one of the members has a fitting recess, and a second member that has the other has a fitting protrusion that fits into the fitting recess.
The fitting projection is pressed into the fitting recess. JP-A-9-6642
No. 1 discloses an example. In the part where the fitting protrusion and the fitting recess are press-fitted and fitted to each other (hereinafter, referred to as a fitting part), the gap between the fitting protrusion and the fitting recess is closed in a liquid-tight manner, and the sealing is performed. It is desirable to have high performance. Not only the joining of the first and second members which does not require the sealing property at the fitting portion,
This is because the inertial press-fitting technique can also be used for joining the first and second members that require sealing. However, according to the conventional inertial press-fitting method, when the cross-sectional shape of the fitting protrusion and the fitting recess is a simple circular shape, the fitting protrusion and the fitting recess are fitted to the outer peripheral surface of the fitting protrusion in a state where they are fitted to each other. Although the inner peripheral surface of the mating concave portion makes surface contact, there is a problem that the sealing performance is low and the use of the first and second members joined by the inertial press-fitting technique is limited. Due to scratches on the outer peripheral surface of the fitting protrusion and the inner peripheral surface of the fitting concave portion, dimensional variations, and variations in the posture (inclination) at the time of press-fitting, the surface pressures of the surfaces fitted to each other become uneven. Therefore, a portion that does not adhere sufficiently occurs, and the sealing performance is reduced. Further, when a ridge parallel to the fitting direction is formed on one of the fitting protrusion and the fitting recess, the ridge bites into the peripheral surface of the mating side, but a gap is formed at a portion other than the biting portion. Because of the easiness, the sealing performance becomes further insufficient.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides an inertial press-fitting method in which the fitting portions of the first and second members to be press-fitted to each other have high sealing properties. The present invention provides the following inertial press-fitting methods according to the present invention. As in the case of the claims, each aspect is divided into sections, each section is numbered, and if necessary, the other sections are cited in a form in which the numbers are cited. This is for facilitating the understanding of the technical features described in this specification and typical combinations thereof, and the technical features described in this specification and their combinations are as follows. It should not be construed as limited. (1) At least one of a first member having a fitting recess and a second member having a fitting projection fitted into the fitting recess is provided with kinetic energy in a direction approaching each other, and the kinetic energy is applied to the first member having the fitting recess. An inertial press-fitting method of press-fitting a fitting protrusion into a fitting recess by inertial motion of a member provided, wherein at least one of an inner peripheral surface of the fitting recess and an outer peripheral surface of the fitting protrusion,
A sealing ridge continuous in the circumferential direction is provided, and after the fitting of the fitting concave portion and the fitting protrusion, the gap between the two is continuous in the circumferential direction by tight fitting of the sealing ridge to the mating peripheral surface. Inertia press-fitting method to make it closed. The term “circumference” is used to represent the inner surface of the fitting recess, the outer surface of the fitting projection, and the direction of the sealing ridge, respectively. The shape is not limited to a circle, and various shapes such as a polygon can be adopted. The fitting recess may be a through hole or a dead end hole. The sealing ridge is provided continuously in the circumferential direction and is closed in the circumferential direction, and the gap between the fitting concave portion and the fitting protrusion fitted together is continuously formed in the circumferential direction by the sealing ridge. Will be blocked. Even if the dimensional accuracy of the outer peripheral surface of the fitting projection and the inner peripheral surface of the fitting concave portion is poor, or the posture at the time of press-fitting is inclined, the sealing ridge is at least one of the inner peripheral surface and the outer peripheral surface. Since it is provided so as to protrude and is easily deformed, it can be tightly fitted to the mating peripheral surface. In addition, since the sealing projection comes into contact with the peripheral surface of the fitting recess in a state close to linear contact, the sealing performance is higher than when the fitting projection and the fitting recess are in surface contact, and the sealing performance is improved. The required first and second members can be connected by inertial press-fitting technology. Further, since the ridge is easily deformed, the interference allowance for tight fitting can be increased, and the processing cost can be reduced. (2) The inertial press-fitting method according to the above mode (1), wherein the cross-sectional shape of the fitting recess and the fitting projection is circular. If the cross-sectional shape of the fitting concave portion and the fitting projection is circular, processing becomes easy and processing accuracy can be easily increased, and
There is an advantage that it is not essential to match the relative phases of the first member and the second member at the time of press-fitting. (3) The inertial press-fitting method according to the above mode (1) or (2), wherein the sealing ridge is formed at least on an inner peripheral surface near an opening of the fitting recess. The fitting protrusion and the fitting recess are sealed at least in the vicinity of the opening of the fitting recess, and the intrusion of liquid such as water into the gap between the fitting recess and the fitting protrusion is performed at the liquid inlet. This is prevented on the opening side of a certain fitting concave portion, and the intrusion of the liquid into most of the fitting portion is prevented. (4) The inertial press-fitting method according to the above mode (1) or (2), wherein the sealing ridge is formed at least on an outer peripheral surface near a base end of the fitting projection. The same effect as in the above item (3) is obtained, and there is an advantage that the formation is easier than forming a sealing ridge near the opening of the fitting recess. (5) The sealing ridge is provided on one of the inner peripheral surface of the fitting concave portion and the outer peripheral surface of the fitting convex portion at intervals in the fitting direction of the fitting concave portion and the fitting projection. Inertial press-fitting method according to any one of the above items (1) to (4). Each of the plurality of sealing projections seals a gap between the fitting projection and the fitting recess, and the sealing performance is further improved. The plurality of sealing protrusions may be provided dispersedly over the entire fitting portion of the fitting protrusion and the fitting recess, or may be provided at both ends of the fitting portion. . The plurality of sealing projections support the fitting projection at a plurality of locations separated in the fitting direction, and the fitting projection is prevented from being inclined with respect to the axis. In addition, if this aspect is adopted when the fitting concave portion is a through hole, it is possible to prevent liquid from entering the fitting portion from openings on both sides of the through hole. Alternatively, the sealing projections may be provided close to each other so that the fitting projection and the fitting recess are intensively sealed by a plurality of sealing projections near the opening of the fitting recess. . If you do this,
Intrusion of liquid into the interior of the fitting portion between the fitting projection and the fitting recess is more reliably prevented. This embodiment is effective not only when the fitting recess is a dead hole but also when it is a through hole. (6) The sealing ridge is formed along a plane perpendicular to the fitting direction of the fitting recess and the fitting projection.
The inertial press-fitting method according to any one of (5). There is an advantage that the formation of the sealing ridge is easy. (7) At least one ridge extending parallel to the fitting direction of the fitting recess and the fitting projection is formed on at least one of the inner peripheral surface of the fitting recess and the outer peripheral surface of the fitting projection. The inertial press-fitting method according to any one of (1) to (6). When the fitting projection is press-fitted into the fitting recess, the protruding ridge extending parallel to the fitting direction bites into the mating peripheral surface, and the fitting portion and the fitting recess are engaged in the circumferential direction. Thereby, if the first and second members are members that transmit torque from one to the other, the effect of improving the ability to transmit torsional torque can be obtained. Further, if the ridge extending in parallel with the fitting direction is provided at a position where the ridge for sealing is fitted to the peripheral surface of the mating member before the ridge for sealing is fitted to the peripheral surface of the mating member, When the projection is fitted, the fitting projection and the fitting recess are accurately positioned by the sealing projection, and the sealing projection is securely press-fitted in a stable posture. (8) A large number of recesses are two-dimensionally dispersed and formed on one of the inner peripheral surface of the fitting concave portion and the outer peripheral surface of the fitting projection, so that the concave portions are continuously formed at the boundaries of the concave portions. The inertial press-fitting method according to any one of (1) to (4), wherein a net-like ridge is formed, and the net-like ridge functions as the sealing ridge. The net-shaped protrusions are also continuous in the circumferential direction and closed in the circumferential direction, and the gap between the fitting recess and the fitting protrusion is continuously closed in the circumferential direction, so that the sealing property is improved.

[0004]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an inertial press-fitting device suitable for carrying out an inertial press-fitting method according to an embodiment of the present invention. The inertial press-fitting device includes a base 10, a first holding device 14 for holding the first member 12 as a press-fitted member fixedly and horizontally, and a second member 1 as a press-fitting member.
The second holding device 1 that holds the first and second members 6 horizontally and in an accessible manner to the first member 12 held by the first holding device 14
8 and a movement control device 20 for controlling the movement of the second member 16 held by the second holding device 18. The first holding device 14, the second holding device 18, and the motion control device 20 are all provided on the base 10. The motion control device 20 includes an acceleration device 22 and a substantial inertial motion realizing mechanism 24.

[0005] The first holding device 14 has a frame 30. The frame 30 is fixed to the base 10. The frame 30 has a hole 32 extending in the horizontal direction. The cylindrical member 3 as a holding member is inserted into the hole 32.
4 is provided detachably. The cylindrical member 34 and the frame 30 have a pair of pins 36 as detachable control members.
Are detachably provided in the radial direction. The pair of pins 36 are simultaneously fitted in the cylindrical member 34 and the frame 30 in the radial direction, thereby preventing the cylindrical member 34 from being detached from the frame 30. The first of the first member 12
The attachment to the holding device 14 is performed as follows. First, the pair of pins 36 are removed from the first holding device 14,
The cylindrical member 34 is removed from the frame 30. Next, the first member 12 is fixed to the cylindrical member 34, and both are mounted on the frame 30.

The second holding device 18 also has a frame 40. This frame 40 is also fixed to the base 10. The frame 40 has a bottomed holding hole 42 extending coaxially with the second member 12 held by the first holding device 14 and opening on the side of the first holding device 14.
Are formed. The holding hole 42 holds the second member 16 so as to be accessible to the second member 12 held by the first holding device 14 by fitting the second member 16 substantially airtightly and slidably. Is what you do. The bottom of the holding hole 42 is a stopper 44. Stopper part 44
Indicates that the second member 16 is held by the holding hole 4 as shown by the broken line in the figure.
2 is positioned at a regular position.

An air passage 50 is formed in the frame 40. The air passage 50 is connected at a port 52 to an air tank 54 that constantly stores air under pressure. In the middle of the air passage 50, a needle valve 56 as a control valve is provided. The needle valve 56 has a valve element 58 slidably fitted to the frame 40, and shuts off the air passage 50 as shown in FIG.
From the air (pressurized air) into the holding hole 42, and from the open state in which the air passage 50 is opened to allow the air from the air tank 54 to flow into the holding hole 42. Switch to This switching is performed by a cam 60 driven by a driving device (not shown). If the needle valve 56 is switched to the open state,
Air flows into the holding hole 42, the pressure behind the second member 16 becomes higher than the atmospheric pressure, and kinetic energy is applied to the second member 16 in a direction approaching the first member 12.

[0008] The second holding device 18 has a conduit 62 as a guide member. The conduit 62 is connected at one end to the frame 40.
And the other end is disposed so as to reach the large-diameter hole 64 of the first member 12 held by the first holding device 14. The conduit 62 defines a path of motion for the second member 16 by mating with the second member 16 in a substantially airtight and slidable manner. That is, in the present embodiment, the holding holes 4
2 and the conduit 62 together form a guide passage for the second member 16. A groove 66 extending in the axial direction is provided on the outer periphery of a portion of the conduit 62 fitted with the first member 12.
Are formed to form an exhaust passage. When a later-described fitting protrusion of the second member 16 is fitted into a later-described fitting recess of the first member 12, the air chamber defined by the fitting recess and the fitting protrusion is always in the atmosphere by the groove 66. , And the pressure in the front in the fitting direction of the fitting projection is maintained substantially at the atmospheric pressure.

The communication hole 68 for communicating the air chamber formed behind the second member 16 in the holding hole 42 with the atmosphere just before the second member 16 contacts the first member 12 is provided in the frame 40. Is formed. Therefore, immediately before the second member 16 contacts the first member 12, the pressure in the air chamber behind the second member 16 becomes substantially equal to the atmospheric pressure, and the second member 16 is in a state of performing a substantial inertial motion. . That is,
The air passage 50, the air tank 54, the needle valve 56, the cam 60, and the like constitute the acceleration device 22, and the portion of the frame 40 forming the communication hole 68 constitutes the substantial inertial motion realizing mechanism 24. 22 and the substantial inertial motion realizing mechanism 24 cooperate with each other to
It constitutes.

The first member 12 is a torsion bar used in a power steering device of a vehicle.
The member 16 is a shaft that is press-fitted into the power steering device such that it cannot be separated from the torsion bar and cannot be rotated relative to the torsion bar. The first member 12 has a generally cylindrical shape with a step, and has a fitting recess 82 having a circular cross section at one end.
Is provided. The inner peripheral surface 84 of the fitting recess 82 is a straight cylindrical surface having a uniform diameter in the axial direction.

The second member 16 has a circular cross-section and extends along one axis, and a fitting projection 86 having a circular cross-section that fits into the fitting recess 82 is formed at one end of the second member 16. ing. The first member 12 and the second member 16 are conceptually shown in FIG. As shown in FIG. 2, the fitting projection 8 of the second member 16
A plurality of annular ridges 90 serving as sealing ridges are formed on the outer peripheral surface 88 of the 6 at intervals in the fitting direction of the fitting recess 82 and the fitting projection 86. Each of the plurality of annular ridges 90 is formed along a plane perpendicular to the fitting direction of the fitting concave portion 82 and the fitting projection 86, and has a perfect circular cross section and is continuous in the circumferential direction. And is closed in the circumferential direction. Further, the dimensions of the plurality of annular ridges 90 before the press-fitting of the respective outer diameters are all the same, and are larger than the dimensions of the diameter of the inner peripheral surface 84 of the fitting recess 82 before the press-fitting.

Prior to press-fitting the second member 16 into the first member 12, the first member 12 is mounted on the first holding device 14, and the second member 16 is held by the second holding device 18. The second member 16 is fitted into the holding hole 42 and is positioned by the stopper 44. And the needle valve 56
Is opened, air is supplied from the air tank 54 to the space in the holding hole 42, and the rear pressure of the second member 16 is made higher than the atmospheric pressure. Thereby, the second member 16 is accelerated in a direction parallel to its own axis, and the second member 16 is given kinetic energy. As a result, the second member 16 approaches the first member 12, and the second member 16 comes into contact with the first member 12 soon, and the fitting recess 8 of the first member 12 of the fitting protrusion 86 of the second member 16.
Press-fitting into 2 is started.

The second member 16 is provided with kinetic energy in a direction approaching the first member 12, and the fitting projection 86 is pressed into the fitting recess 82 by inertial movement. While the annular ridge 90 fits tightly on the inner peripheral surface 84 of the fitting recess 82,
Both are welded to each other by frictional heat. Annular ridge 9
The dimensions of the outer diameter of 0 and the inner diameter of the inner peripheral surface 84 of the fitting recess 82 before the press-fitting are set so that the annular ridge 90 is welded to the fitting recess 82. As a result,
The second members 12 and 16 are firmly connected, and after the fitting of the fitting recess 82 and the fitting projection 86, the gap between the fitting recess 82 and the fitting projection 86 is continuous in the circumferential direction. It is closed and provides high sealing performance. In addition, the annular ridge 9
0 and the inner peripheral surface 84 of the fitting recess 82 may be fitted and fitted, and welding is not essential.

Another embodiment of the present invention is shown in FIG. In this embodiment, the fitting recess 102 provided in the first member 100 has a stepped shape with a bottom, and the opening side is the large-diameter recess 10.
4. Small-diameter recess 106 on the bottom side having a smaller diameter than large-diameter recess 104
It has been. The outer peripheral surface 114 of the fitting protrusion 112 of the second member 110 has a tip portion (the fitting recess 102 first).
Serrations are formed on the side of the serration, and the plurality of peaks (projections) of the serration are respectively
A projection 116 extends parallel to the fitting direction of the fitting recess 102 and the fitting projection 112. These multiple ridges 1
16 are provided at equal angular intervals. In addition, the protrusions 116 on the outer peripheral surface 114 of the fitting protrusion 112
A plurality of annular ridges 118 (in the present embodiment) serving as sealing ridges similar to the annular ridge 90 are provided adjacent to the base end side (the side to be fitted later with the fitting concave portion 102) of Are two). The distance from the axis of the fitting projection 112 on the outer surface of the ridge 116 is smaller than the radius of the inner peripheral surface 122 of the large-diameter concave portion 104 and larger than the radius of the inner peripheral surface 120 of the small-diameter concave portion 106. Ridge 118
Is made larger than the diameter of the inner peripheral surface 122 of the large-diameter recess 104. In addition, these dimensions are all dimensions before press fitting.

The second member 110 is brought close to the first member 100 by the air supplied from the air tank, like the second member 12, and the fitting protrusion 112 is moved by inertial motion.
Are fitted into the fitting recesses 102. First, the fitting protrusion 112
The portion provided with the ridge 116 is fitted into the fitting concave portion 102.
2 penetrates without penetrating into the inner peripheral surface 120 of the small-diameter recess 106 and is welded to each other by frictional heat. Also, the two annular ridges 118 are large-diameter concave portions 1.
04 and fit together and are welded to each other by frictional heat. The two annular protrusions 118
Large-diameter recess 1 that does not rub against ridges 116 and is not roughened
04 is pressed into the inner peripheral surface 122 of the first and second members 10.
0,110 are securely connected. In the present embodiment, the torque transmitting ability between the first member 100 and the second member 110 depends on the inner peripheral surface 12 of the small-diameter recess 106 of the ridge 116.
0 because it is secured by digging into 0
The necessity of welding the 18 to the inner peripheral surface 122 of the large-diameter recess 104 is lower than that of the above-described embodiment.

FIG. 4 shows still another embodiment of the present invention.
In this embodiment, the first member is configured similarly to the embodiment shown in FIGS. 1 and 2, and is denoted by the same reference numeral. On the outer peripheral surface 134 of the fitting projection 132 of the second member 130, a large number of concave portions 136 are formed in a two-dimensionally dispersed manner. A net-like ridge 138 is formed. The mesh ridge 138 is continuous and closed in the circumferential direction of the fitting projection 132, and functions as a sealing ridge.
The size of the diameter of the outer surface of the mesh ridge 138 (the distance of the portion of the mesh ridge 138 located in a plane perpendicular to the fitting direction of the fitting protrusion 132 from the axis of the fitting protrusion 132) before press-fitting. Is larger than the diameter of the inner peripheral surface 84 of the fitting recess 82 before the press-fitting.

When the fitting projection 132 is press-fitted into the fitting recess 82, the mesh projection 138 fits tightly with the inner peripheral surface 84 of the fitting recess 82, and the mesh projection 138 and the fitting recess 8 are fitted.
The two are welded to each other by the frictional heat of No. 2 and the first and second
The members 12, 130 are firmly connected. Further, the gap between the fitting projection 132 and the fitting recess 82 is continuously closed in the circumferential direction.

In each of the above embodiments, the annular ridges 90 and 118 and the mesh ridge 138 are formed by the second member 1.
6, 110 and 130, but may be provided on the first member having the fitting recess. For example, as shown in FIG.
On the entire inner peripheral surface 144 of the fitting recess 142 of the member 140,
A plurality of annular ridges 146 as seal ridges are provided. These annular ridges 146 have a fitting recess 142,
The second member 148 is formed along a plane perpendicular to the direction in which the second member 148 is fitted to the fitting protrusion 150, has a perfect circular cross section, and is continuously closed in the circumferential direction. Part 15
0 and the fitting recess 142 are formed at intervals in the fitting direction. The dimensions before fitting of the fitting projections 150 of the respective inner diameters of the plurality of annular projections 146 are all the same, and are smaller than the dimensions of the diameter of the fitting projections 150 before fitting.

When the fitting projection 150 is press-fitted into the fitting recess 142, the annular ridge 146 fits tightly with the fitting projection 150 and is welded to each other by the frictional heat of the two. The members 140 and 148 are firmly connected, and the gap between the fitting projection 150 and the fitting recess 142 is continuously closed in the circumferential direction.

In the embodiment shown in FIGS. 1 and 2, only one annular ridge may be provided. For example, as shown in FIG. 6, the position is slightly away from the tip of the fitting protrusion 162 of the second member 160 (the end which is first fitted into the fitting recess of the first member), and One annular ridge 164 is provided at the base end of the portion 162. The fitting recess 168 of the first member 166 has a stepped shape in which the diameter of the opening is larger than the bottom.
The diameter of the tip of the outer peripheral surface 170 of the fitting projection 162 where the annular ridge 164 is not provided is smaller than the diameter of the inner peripheral surface 174 of the large-diameter recess 172 of the fitting recess 168, and is smaller than the diameter of the small-diameter recess 176. The diameter is larger than the diameter of the peripheral surface 178. In addition, the outer diameter of the annular ridge 164 is larger than the diameter of the inner peripheral surface 174 of the large-diameter concave portion 172. All of these dimensions are dimensions before press fitting.

When the fitting protrusion 162 is press-fitted into the fitting recess 168, first, the tip of the fitting protrusion 162 on which the annular protrusion 164 is not provided is press-fitted into the small-diameter recess 176. The inclination of the two members 160 with respect to the axis is prevented. Next, the annular ridge 164 is press-fitted into the large-diameter concave portion 172 to perform sealing. Fitting projection 16
The tip of the second member 2 is pressed into the small-diameter recess 176 without penetrating the inner peripheral surface 174 of the large-diameter recess 172. The annular ridge 164 does not rub against the distal end of the fitting projection 162, bites into the inner peripheral surface 174 of the large-diameter concave portion 172 that is not roughened, fits tightly, and is welded to each other by frictional heat to form a seal. Is performed well. Instead of making the opening of the fitting concave portion a large-diameter portion, it may be a tapered opening whose diameter gradually increases toward the opening side.

In the embodiment shown in FIG. 1 and FIG. 2, the diameter of the inner peripheral surface of the fitting recess before the press-fitting of the fitting projection is made uniform in the axial direction. The inner peripheral surface may be a tapered inner peripheral surface having a small taper value such that the diameter before press-fitting decreases as the distance from the opening increases. The fitting projection has, for example, annular projections at two locations, that is, a portion near the distal end and a position away from the distal end, and these annular projections have the same outer diameter. At the time of press-fitting of the fitting projection into the fitting recess, the annular ridge on the tip end side of the fitting projection rubs from the opening side of the inner peripheral surface of the fitting recess on the inner peripheral surface and the entire periphery. The annular ridge provided at a position distant from the tip of the fitting protrusion while being fitted together is fitted into the fitting recess at a point near the end of press-fitting, and the entire inner peripheral surface of the fitting recess is Rub around each other. For this reason, the annular protrusion on the distal end side has a greater amount of wear due to friction with the inner peripheral surface of the fitting concave portion, but the inner peripheral surface of the fitting concave portion should be the tapered inner peripheral surface as described above. As a result, the annular ridge on the tip end side of the fitting protrusion fits tightly with the portion near the fitting limit position (the fitting end farther from the opening where the fitting protrusion enters) of the fitting recess, and the other end. The annular ridge is tightly fitted with the inner peripheral surface on the opening side of the fitting recess,
It can be made to be press-fitted with the same interference and welded in the same state. In addition, the dimensions before press-fitting of the outer diameters of the plurality of annular ridges 90 are all the same, but may be different from each other. For example, near the tip of the fitting protrusion,
An annular ridge is provided at each of two positions apart from the distal end, and the outer diameter of the annular ridge on the distal end side is made larger than the other. The diameter of the inner peripheral surface of the fitting recess before press fitting is made uniform in the axial direction. When the fitting protrusion is press-fitted into the fitting recess, the annular ridge on the tip side of the fitting protrusion is closer to the inner peripheral surface of the fitting recess than the annular ridge provided apart from the tip. Abrasion is large and the amount of wear is large,
By increasing the outer diameter, the two annular ridges can be pressed into the fitting recesses with a substantially uniform interference margin and welded in the same state. In any of these cases, three or more annular ridges may be provided at intervals in the axial direction. If the diameter of the inner peripheral surface of the fitting recess is made uniform in the axial direction, it is preferable that the outer diameter of the annular ridge be larger toward the tip of the fitting ridge. . In addition, the inner peripheral surface of the fitting concave portion has a tapered inner peripheral surface whose diameter decreases as the distance from the opening increases, and the outer diameter of the plurality of annular ridges is changed to the annular ridge on the distal end side of the fitting projection. It may be as small as possible. In this case, the outer diameter of the annular ridge and the inner diameter of the fitting recess are adjusted so that the plurality of annular ridges are pressed into the fitting recesses with the same interference, and are welded in the same state. It is desirable to set. When the fitting protrusion is press-fitted into the fitting recess, the annular ridge on the distal end side of the fitting protrusion reaches the inner peripheral surface of the fitting recess and the entire circumference until the vicinity of the fitting limit position of the fitting recess. Are fitted without rubbing, and are pressed in while being rubbed and abraded on the inner peripheral surface and the entire circumference in the vicinity of the fitting limit position of the fitting recess, and the annular ridge far from the tip of the fitting projection is At a point near the end of the press-fitting, the press-fitting is performed while rubbing against the inner peripheral surface of the fitting concave portion, so that a plurality of annular ridges are worn by substantially the same amount and are pressed-in with substantially the same interference. Is desirable.

Further, in the embodiment shown in FIG. 3, only one sealing ridge may be provided. Further, in the embodiment shown in FIG. 4, also in the case where a mesh-like projection is provided on the fitting projection of the second member to function as a sealing projection, the circumstances are the same as the case where an annular projection is provided in the fitting projection. It is almost the same, and can take various forms similarly to the case where the annular ridge is provided.

The features described in the above embodiments can be implemented in combination with each other. For example,
In the embodiment shown in FIG. 4, a net-like ridge may be provided, and a ridge extending parallel to the fitting direction may be provided at the distal end side. In the case where a sealing ridge is provided on the inner peripheral surface of the fitting concave portion, the inner diameter of the sealing ridge on the opening side may be smaller, or the diameter of the fitting ridge may be smaller on the tip side.

In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an inertial press-fitting device suitable for performing an inertial press-fitting method according to an embodiment of the present invention.

FIG. 2 is a view conceptually showing a first member and a second member that are press-fitted to each other in the inertial press-fitting device.

FIG. 3 is a view conceptually showing a first member and a second member press-fitted by an inertial press-fitting method according to another embodiment of the present invention.

FIG. 4 is a view conceptually showing a first member and a second member which are press-fitted by an inertial press-fitting method which is still another embodiment of the present invention.

FIG. 5 is a view conceptually showing a first member and a second member which are press-fitted by an inertial press-fitting method which is still another embodiment of the present invention.

FIG. 6 is a view conceptually showing a first member and a second member which are press-fitted by an inertial press-fitting method which is still another embodiment of the present invention.

[Explanation of symbols]

12: first member 16: second member 82: fitting recess 84: inner peripheral surface 86: fitting protrusion 88: outer peripheral surface 90: annular ridge 100: first member 102: fitting recess 110: second Member 112: fitting protrusion 114: outer peripheral surface 116: protrusion 11
8: annular ridge 120, 122: inner peripheral surface 13
0: second member 132: fitting projection 134: outer peripheral surface 136: concave portion 138: net-like projection 140: first member 142: fitting concave portion 144: inner peripheral surface 146: annular projection
148: second member 150: fitting protrusion 160: second member 162: fitting protrusion 164: annular protrusion
166: First member 168: Fitting recess 170:
Outer surface 174, 178: inner surface

Continued on the front page (72) Inventor Hideo Mori 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Hiroyuki Takeuchi 1 Toyota Town Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Invention Person Michiya Inui 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3C030 BC19 BC22

Claims (1)

[Claims] A kinetic energy is applied to at least one of a first member having a fitting concave portion and a second member having a fitting projection fitted into the fitting concave portion so as to approach each other, and the motion is provided. An inertial press-fitting method for press-fitting a fitting protrusion into a fitting recess by inertial movement of a member to which energy is applied, wherein at least one of an inner peripheral surface of the fitting recess and an outer peripheral surface of the fitting protrusion, Providing sealing ridges continuous in the circumferential direction,
After the fitting of the fitting concave portion and the fitting protrusion, the gap between the two is continuously closed in the circumferential direction by tight fitting of the sealing ridge to the mating peripheral surface. Inertia press-fitting method.