JP4297268B2 - Rivet joint structure - Google Patents

Description

  The present invention relates to a rivet-bonding structure suitable for use in bonding a bonded body in which a plurality of bonded members including a bonded member formed of a small ductile material are overlapped.

  In general, electromagnetic products such as a rotary solenoid and an electric motor are provided with a yoke constituting a magnetic circuit. The yoke is formed by laminating a plurality of magnetic plates such as silicon steel plates, and the yoke and the bracket (cover) are often joined together by rivets to form a laminated component.

Conventionally, as a rivet coupling structure for coupling such a yoke and a bracket (cover) by rivets, a rivet coupling structure (small motor) disclosed in Japanese Patent Laid-Open No. 10-14144 is known. In this rivet coupling structure, a through hole is formed near the end, a cover is abutted on both sides, a fitting cylinder provided on the cover is fitted into the through hole, and the fitting cylinder and the through hole are riveted. , And the rivet is crimped, and the step diameter is formed in the through hole by reducing the hole diameter of the inner back part with respect to the hole diameter of the part where the fitting cylindrical part of the through hole is fitted. is there.
Japanese Patent Laid-Open No. 10-14144

  By the way, when the yoke is constructed by laminating a plurality of magnetic plates, the thickness tolerance of the entire laminated component is a value obtained by adding the tolerances of the respective magnetic plates. The conventional rivet connection structure has a problem that causes the following problems because it is performed with a caulking die set to be constant.

  First, if the tolerance increases in the direction of thickening the yoke, excessive stress will be applied to the laminated parts during rivet caulking, and a small ductility material, that is, a synthetic resin material containing glass fiber, etc., will be applied to the bracket. When a material having small ductility and brittleness is used, the bracket is cracked or broken.

  Second, if the tolerance increases in the direction of thinner yoke, the mechanical coupling force of the yoke will be insufficient even if caulking is performed, looseness due to looseness, and deterioration or destabilization of characteristics, etc. Will be invited.

  An object of the present invention is to provide a rivet coupling structure that solves the problems existing in the background art.

  In order to solve the above-described problems, the present invention provides a rivet insertion hole 5p in a coupled body 4 in which a plurality of coupled members 2p, 2q, 3 ... including coupled members 2p, 2q formed of a small ductile material are overlapped. ..., 5q ..., 5s ... are inserted through a rivet 6 having a head 7h ... at one end 6s ... and a hollow recess 7o ... at the other end 6t, and the other end 6t ... of the rivet 6 ... is outside. Of the rivet insertion holes 5p, 5q in the coupled members 2p, 2q formed of a small ductility material when the rivet coupling structure 1 is formed by coupling the coupled bodies 4 by applying the crimp K ... In the opening portions on the side or on both sides, cutting shape portions 2pr..., 2ps..., 2qr... That release the stress Fs of the rivets 6. The other end 6t A ring for connecting the plurality of radiating ridges 12 arranged at predetermined intervals around the opening of the rivet insertion hole 5q, and the radiating ridges 12 ... to the surface of the coupled member 2q to which the side is pressed. The protrusions 12j are integrally formed and provided with protrusions 11 that absorb the stresses Fs and Fr of the rivets 6 when the other ends 6t of the rivets 6 are pressed against each other.

  In this case, according to a preferred aspect of the invention, the cut shape portions 2pr, 2ps, 2qr, ... can be formed by tapered surfaces T, where the opening sides of the rivet insertion holes 5p, 5q, ... gradually increase in diameter. It should be noted that a laminated component configured by sandwiching both sides of a laminated portion 13 in which a plurality of laminated plates 3 are laminated with a pair of brackets 2p and 2q formed of a small ductility material can be applied to the coupled body 4. .

  According to the rivet coupling structure 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Even if a small ductility material such as a synthetic resin material containing glass fiber is used for the members 2p and 2q and the tolerance increases in the direction in which the member 4 is thickened, the cutting shape portion The space formed by 2pr..., 2ps..., 2qr... Allows the stress Fs in the axial direction due to the rivets 6 to be released, so that cracks and breakage of the coupled members 2p and 2q can be prevented.

  (2) Since the stress Fs in the axial direction caused by the rivets 6 can be released by the space formed by the cutting shape portions 2pr, 2ps, 2qr, ..., the cutting shape portions 2pr, 2ps, 2qr, ... are provided. The standard thickness of the coupled body 4 can be set larger than the case where the coupled body 4 is not present, and even if the tolerance increases in the direction in which the coupled body 4 becomes thinner, the coupled body 4 has a sufficient thickness. The mechanical coupling force can be secured, and the occurrence of looseness due to loosening, deterioration of characteristics and instability can be avoided.

  (3) A plurality of radial protrusions arranged at predetermined intervals around the opening of the rivet insertion hole 5q on the surface of the member 2q to which the other end 6t of the rivet 6 to which the crimping K is applied is pressed. 12 and the ring ridges 12j that connect the radiating ridges 12 to each other, and absorb the stresses Fs and Fr of the rivets 6 when the other ends 6t of the rivets 6 are in pressure contact. Since the projecting portions 11 are provided, the stresses Fs and Fr when the caulking K is applied to the other ends 6t of the rivets 6 can be absorbed, thereby contributing to prevention of further cracking and breakage of the coupled members 2p and 2q. .

  (4) If the cut shape portions 2pr, 2ps, 2qr,... Are formed by the tapered surfaces T, according to a preferred embodiment, the rivets 6 can be easily inserted and the workability can be improved.

  (5) According to a preferred embodiment, if the protrusions 11 are formed by a plurality of radiating ridges 12 and ring ridges 12j that connect the radiating ridges 12 to each other, stress is mainly applied. It is possible to reinforce the radiating ridges 12 ... that absorb Fs, Fr by the ring ridges 12j, especially when a part of the radiating ridges 12 ... is damaged. However, it is possible to avoid the problem that the fragments are separated (scattered).

  (6) According to a preferred embodiment, the structure is formed by sandwiching both sides of a laminated portion 13 in which a plurality of laminated plates 3 are laminated with a pair of brackets (coupled members) 2p and 2q formed of a small ductility material. By applying the laminated component, it is possible to obtain a laminated component with high assembly accuracy and high quality.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the structure of the rivet coupling structure 1 according to the present embodiment will be described with reference to FIGS. The illustrated rivet coupling structure 1 is applied to the rotary solenoid M shown in FIGS.

  In the figure, reference numeral 4 denotes a member to be coupled by the rivet coupling structure 1. The joined body 4 is a laminated part, and a laminated portion 13 in which a plurality of laminated plates (joined members) 3 are laminated and a pair of brackets (joined members) 2p and 2q formed of a small ductility material are overlapped. Constitute. The laminated plate 3 uses a silicon steel plate that is a magnetic plate, and the laminated portion 13 is formed by laminating about 20 to 30 laminated plates 3. Thereby, the laminated portion 13 becomes a yoke (laminated iron core) of the rotary solenoid M. In addition, the lamination | stacking part 13 can be comprised as a division | segmentation iron core divided | segmented into 2 to 3 as needed, and can be integrated by mounting | wearing. Further, the laminated portion 13 is provided with four rivet insertion holes 5s through which rivets 6 to be described later are inserted.

  On the other hand, the bracket 2p is integrally formed of a synthetic resin material containing glass fiber, which is a small ductility material. The bracket 2p has a rectangular end surface, and is provided with stepped recesses 21 at the four corners of the end surface. The recesses 21 have four rivet insertion holes 5p corresponding to the rivet insertion holes 5s described above. ... is provided. The small ductility material is a material having small ductility and brittleness. Further, as shown in FIG. 2, at the opening portions on both sides of each rivet insertion hole 5p, the cut shape portions 2pr, 2ps, whose opening side has a large diameter, that is, tapered surfaces T whose opening side gradually increases in diameter. The cut shape portions 2pr, 2ps, ... formed by ... are provided. In this case, the angle of the tapered surface T is selected to be around 45 [°] with respect to the axial direction. Furthermore, the maximum diameter on the opening side of the tapered surface T of the cutting shape portion 2 ps is selected to be smaller than the outer diameter of the head 6 h of the rivet 6, and preferably smaller, and the tapered surface of the cutting shape portion 2 pr. The maximum diameter on the opening side in T ... is selected to be larger than the maximum diameter on the opening side in the tapered surface T ... of the cut shape portion 2ps ..., and preferably larger.

  On the other hand, the bracket 2q is also integrally formed of a synthetic resin material containing glass fiber, which is a small ductility material, and provided with first concave portions 22b ... having stepped shapes at the four corners of the end face formed in a rectangular shape. The second concave portions 22 are formed in a circular shape as shown in FIGS. 3 and 4, and four rivet insertion holes 5 q corresponding to the respective rivet insertion holes 5 s are provided in the concave portions 22. Further, as shown in FIG. 3, the opening portion on one side (inner side) of each rivet insertion hole 5q is a cutting shape portion 2qr having a large diameter on the opening side, that is, a tapered surface having a gradually increasing diameter on the opening side. Cutting shapes 2qr formed by T are provided. In this case, the shape of the cutting shape portion 2qr... Is the same as the above-described cutting shape portion 2pr.

  By providing such a cutting shape portion 2qr... And the above-described cutting shape portions 2pr..., 2ps..., Even if an axial stress Fs from a rivet 6. A space in which the stress Fs can be released, that is, a space allowing deformation of the brackets 2p and 2q can be formed. These cutting shapes 2pr, 2ps, 2qr, etc. do not necessarily need to be formed by the tapered surfaces T ..., but by forming them by the tapered surfaces T, the rivets 6 can be easily inserted and processed. There is an advantage that can be improved.

  Further, the stress in the axial direction from the rivet 6 when the other end 6t of the rivet 6 to be described later is in pressure contact with the surface of the recess 22 in the bracket 2q around the opening of the rivet insertion hole 5q. Projections 11... That absorb Fs and radial stress Fr are integrally formed. In this case, the protrusions 11... Are a plurality of (eight illustrated) radiating ridges 12 arranged at predetermined intervals around the openings in the rivet insertion holes 5 q. It is integrally formed by ring ridges 12j. By providing such projections 11..., The stresses Fs and Fr are mainly absorbed by the radiating ridges 12, and the radiating ridges 12 j are reinforced by the ring ridges 12 j. In particular, even if a part of the radiating ridges 12 is damaged, it is possible to avoid a problem that the fragments are separated (scattered). The absorption of the stresses Fs and Fr by the radiating ridges 12 (ring ridges 12j) is performed as follows. That is, when caulking K is applied to the other ends 6t of the rivets 6 to be described later, axial stress Fs and radial stress Fr are applied to the bracket 2q by the other end 6t spreading outward. However, the stresses Fs and Fr are not directly applied to the surface of the bracket 2q, but are easily deformed from the radiating ridges 12 standing on the relatively narrow ridges from the surface of the bracket 2q (ring ridges 12j). ) Is effectively absorbed.

  Reference numeral 6 denotes a rivet used in the rivet coupling structure 1, and a known rivet having a head 7h at one end 6s of the rivet shaft portion 6a and a hollow recess 7o at the other end 6t can be used. In this case, the head 7h is of a round type and has a shape obtained by slicing a part of a sphere. On the other hand, the other end 6t having the hollow recess 7o has a cylindrical shape with an open front end, and the other end 6t is spread outward (curled) by a known caulking die, so that caulking K can be applied.

  Next, a method for manufacturing the rotary solenoid M including a coupling method for obtaining the rivet coupling structure 1 according to the present embodiment will be described.

  First, about 20 to 30 laminated plates 3 are laminated to produce a laminated portion 13 (yoke). In this case, the laminated portion 13 can be manufactured by a known method. For example, each laminated plate 3... Can be formed by press-fitting fixing pins into through holes provided at a plurality of positions of the laminated laminate 3. The laminated portion 13 to be integrated can be manufactured. The entire laminated portion 13 has a U-shape, and a coil portion 33 manufactured by winding a coil 32 around a coil bobbin 31 is attached to the central portion 13 c of the laminated portion 13. Further, both side portions 13m and 13n of the laminated portion 13 become magnetic pole portions (field portions) that generate N poles and S poles, respectively, when a DC voltage is applied to the coil 32 for excitation.

  On the other hand, a magnet rotor having a bipolar magnet attached to the outer peripheral portion of the shaft portion 34 is prepared, and this magnet rotor is interposed between both side portions (magnetic pole portions) 13m and 13n of the laminated portion 13 and both side portions 13m and 13n. One bracket 2p is overlapped on one end side of the other, and the other bracket 2q is overlapped on the other end side of both side portions 13m, 13n. Thus, both end sides of the laminated portion 13 are sandwiched between the pair of brackets 2p and 2q, and both end sides of the shaft portion 34 of the magnet rotor are respectively inserted into bearing holes provided at the centers of the brackets 2p and 2q.

  Then, four rivets 6 are prepared, and the rivets 6 are inserted into the rivet insertion holes 5p, 5s, 5q from one bracket 2p side. As a result, the other end 6t side of the rivet 6 protrudes from the other bracket 2q side. In this state, the rivet 6 is set in a caulking die, and the other end 6t of the rivet 6 is spread outward (curled). By applying caulking K ..., the projections 11 ... are pressed against each other by the other end 6t spreading outward, and a laminated component (bonded body 4) integrated by the rivet connection structure 1 is obtained. After that, as shown in FIG. 7, the stopper 35 is fixed to the tip of the shaft portion 34, and the rotary solenoid M is completed by assembling necessary parts such as interposing the spring 36 between the stopper 35 and the bracket 2p.

  In the state where the coil 32 is not energized, the rotary solenoid M is biased by the spring 36 and displaced to the first position Xs in FIG. 7, and the coil 32 is excited by energizing the coil 32. N pole and S pole are generated on both side portions 13m and 13n of the laminated portion 13, respectively. As a result, the magnet rotor equipped with the two-pole magnet is rotationally displaced against the elasticity of the spring 36, and the stopper 35 is displaced to the second position Xm in FIG. Note that the rotation angle range of the stopper 35, that is, the first position Xs and the second position Xm are regulated by the recess 37 formed in the bracket 2 p.

  Therefore, according to the rivet coupling structure 1 according to the present embodiment, the tolerance increases in the direction in which the coupled body 4 (laminated parts) becomes thicker, and the rivets 6 to the brackets when the caulking K is applied. Even if an excessive stress Fs in the axial direction is applied to 2p, 2q, it can be released by the space formed by the cut shape portions 2pr, 2ps, 2qr, and glass fibers are contained in each bracket 2p, 2q. Even when a small ductility material such as a synthetic resin material is used, cracks and breakage of each bracket 2p, 2q can be prevented. Further, since the deformation of each bracket 2p, 2q is allowed by the space formed by the cut shape portions 2pr, 2ps, 2qr, ..., the start position of the caulking K ... is a shallow position of the opening in the rivet insertion hole 5q ... Thus, the bending moment applied to the opening of the rivet insertion hole 5q can be reduced.

  Further, since the axial stress Fs due to the rivets 6 can be released by the space formed by the cutting shapes 2pr, 2ps, 2qr, ..., the cutting shapes 2pr, 2ps, 2qr, ... are not provided. The standard thickness of the coupled body 4 can be set larger than the case, and even if the tolerance increases in the direction in which the coupled body 4 becomes thinner, sufficient machinery of the coupled body 4 can be obtained. It is possible to secure a strong coupling force, and to avoid the occurrence of looseness due to loosening, deterioration of characteristics and instability.

  Moreover, since the projections 11 are provided on the surface of the bracket 2q where the other ends 6t of the rivets 6 to which the caulking K is applied are pressed, the axial direction when the caulking K is applied to the other ends 6t of the rivets 6 is provided. The stress Fs and the radial stress Fr can be absorbed, and it can contribute to the prevention of cracks and breakage of the brackets 2p and 2q. In particular, since the protrusions 11 are formed by a plurality of radiating ridges 12 and ring ridges 12j that connect the radiating ridges 12 to each other, they mainly absorb the stresses Fs and Fr. The radiating ridges 12 can be reinforced by the ring ridges 12j. In addition, since the laminated part of the rotary solenoid M configured by sandwiching the both sides of the laminated part 13 in which the plurality of laminated plates 3 are laminated with the pair of brackets 2p and 2q formed of the small ductility material is applied to the coupled body 4, Assembling accuracy is high, and high quality laminated parts can be obtained.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in the detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted arbitrarily.

  For example, although a glass fiber-containing synthetic resin material has been exemplified as the small ductility material, any small ductility material that may break due to the applied pressure is applied. Moreover, although the case where cutting shape part 2pr ..., 2ps ... was provided in the opening part of the rivet penetration hole 5p ... in the to-be-joined member 2p was illustrated, one cutting shape part 2ps ... does not necessarily need to provide. Furthermore, although the laminated component which comprised the both sides of the lamination | stacking part 13 which laminated | stacked the some laminated board 3 ... as a to-be-joined body 4 between the pair of brackets 2p and 2q was illustrated, other arbitrary arbitrary having the same structure The present invention can be applied to the coupled body 4.

A longitudinal sectional view of a rivet connection structure according to the best embodiment of the present invention, An enlarged longitudinal sectional view near the head of the rivet in the rivet coupling structure, An enlarged longitudinal sectional view near the caulking of the rivet in the rivet coupling structure, A partially broken bottom view showing a protrusion provided on a bracket used for the rivet coupling structure, An exploded view of a rivet and a body to be coupled, including a partial cross section in the rivet coupling structure External front view of a rotary solenoid using the rivet coupling structure, External plan view of a rotary solenoid using the rivet coupling structure,

Explanation of symbols

1 Rivet connection structure 2p Connected member (bracket)
2q Connected member (bracket)
2pr ... Cutting shape part 2ps ... Cutting shape part 2qr ... Cutting shape part 3 ... Joined member (laminate)
4 Ribbed insertion hole 5q ... Rivet insertion hole 6 ... Rivet 6s ... One end of rivet 6t ... Other end of rivet 7h ... Head of rivet 7o ... Hollow recess of rivet 11 ... Projection 12 ... Radiating ridge 12j ... Ring ridge 13 ... Laminate K Kashing Fs Stress Fr Stress T ... Tapered surface

Claims (3)

  A rivet having a head at one end and a hollow recess at the other end is inserted into a rivet insertion hole in a coupled body in which a plurality of coupled members including a coupled member formed of a small ductile material are overlapped, In the rivet coupling structure in which the coupled body is coupled by caulking the other end of the rivet outward, the opening portion on one side or both sides of the rivet insertion hole in the coupled member formed of a small ductile material. In addition to providing a cutting shape portion that releases the rivet stress by forming the opening side with a large diameter, the other end side of the crimped rivet is pressed against the surface of the member to be joined around the opening in the rivet insertion hole. A plurality of radiating ridges arranged at predetermined intervals and a ring ridge that connects the radiating ridges to each other are integrally formed, and the rivet is Riveting structure characterized in that a projecting portion for absorbing the bets stress.   2. The rivet coupling structure according to claim 1, wherein the cutting shape portion is formed by a tapered surface having a gradually increasing diameter on the opening side of the rivet insertion hole.   2. The rivet-bonding structure according to claim 1, wherein the joined body is a laminated part in which both sides of a laminated part in which a plurality of laminated plates are laminated are sandwiched between a pair of brackets formed of a small ductility material. .

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