JP4203397B2 - Magnet generator - Google Patents

Description

  The present invention relates to a magnet generator that is mounted in an engine such as a motorcycle (motorcycle), a buggy, or a snow vehicle and charges a battery and supplies electric power to an electric load.

  FIG. 12 shows a conventional example of a magnet generator. In FIG. 12, 1 denotes an engine crankshaft, 2 denotes an engine case, and 3 denotes an engine cover attached to the engine case 2 with a fastening screw 4. A rotor 5 is fixed to the end 1 a of the crankshaft 1, and a stator 6 is disposed inside the rotor 5. The power generating coil 62 of the stator 6 is connected to a lead wire 65, and the lead wire 65 is drawn to the outside through a lead wire drawing through hole 77 a formed in the grommet portion 7. Here, the grommet portion 7 is sandwiched between a substantially semicircular groove 3 c formed in the engine cover 3 and the end surface 2 a of the engine case 2. The assembling of the grommet portion 7 is performed at the same time when the engine cover 3 is fixed to the engine case 2 with the fastening screws 4 in a state where the grommet portion 7 is attached to the groove 3c of the engine cover 3.

  However, when the grommet portion 7 in the above prior art is applied to a magnet generator having a form different from the magnet generator shown in FIG. 12, the following problems occur. That is, from the viewpoint of the design of the magnet generator or the layout with peripheral devices surrounding the magnet generator, a through hole is formed in the engine cover 3 instead of the groove 3c as described above. When the grommet portion 7 is inserted and fixed, the flange portion 7a of the grommet portion 7 is set sufficiently larger than the through hole, and the groove portion 7b of the grommet portion 7 is slightly larger than the through hole due to tightening allowance (press fitting allowance). Therefore, the operation of inserting the grommet portion 7 into the through hole is impossible or extremely difficult.

  The present invention solves the problems of the prior art as described above, and can insert the grommet part into the through hole formed in the engine cover very easily and is originally required for the grommet part. It is an object of the present invention to provide a magnet generator capable of sufficiently ensuring the sealing performance (prevention of engine oil leakage and water ingress).

The magnet generator according to the present invention fixes the stator on the inside, is attached to the engine cover fixed to the engine case, and draws out the lead wire connected to the generator coil of the stator to the outside of the engine cover. in magneto generator provided with the grommet portion, the engine cover is provided with a through hole for the grommet mounting with a tapered surface slide into reduced in diameter from the inside to the outside, the grommet portion has one threaded hole A seal portion having a collar and a seal portion integrated so as to surround the collar and a grommet plate welded to the collar, and a collar with a grommet plate formed by welding the grommet plate to the collar as an insert body A single body having a main body manufactured by integrally molding a screw and a male screw portion screwed into the screw hole of the collar. And a presser plate that has a screw insertion hole through which the male screw portion of the tightening screw passes and is pressed against the outer surface of the engine cover around the through hole for attaching the grommet, and the seal portion is used for attaching the grommet There is a fastening margin with the taper surface of the through hole, and the seal portion has an annular step portion with a fastening margin with the inner end of the taper surface and for inserting a detent jig at the rear portion. A concave portion, and the main body portion is inserted into the grommet mounting through-hole from the inside of the engine cover, and a male screw portion of a tightening screw is passed through the screw insertion hole of the presser plate from the outside of the engine cover, and the seal The grommet portion is integrated with the male screw portion by screwing the male screw portion into the collar screw hole of the main body portion with the rotation prevention jig inserted into the recess for inserting the rotation prevention jig. Wherein is fixed to the grommet mounting through hole, characterized by comprising.

  According to the magnet generator of the present invention, the main body portion is inserted into the grommet mounting through-hole from the inside of the engine cover, and the male screw portion of the tightening screw is passed from the outside of the engine cover to the screw insertion hole of the presser plate. The grommet part is integrated by screwing into the screw hole of the collar of the main body part, and at the same time, the grommet part is fixed to the through hole for attaching the grommet. For this reason, a grommet part can be fixed to an engine cover by an extremely simple operation. In addition, when the grommet is fixed to the engine cover, the seal portion has a through hole for mounting the grommet in the engine cover due to a tightening margin between the inner end of the tapered surface of the through hole for mounting the grommet and the annular stepped portion. It is in a pressure contact state with respect to the peripheral portion, and a sufficient sealing performance can be ensured.

The grommet part is manufactured by welding a grommet plate to the collar to form a collar with a grommet plate, and by integrally forming the seal part with the collar with the grommet plate as an insert body, the grommet plate increases the rigidity of the grommet part. The seal part of the grommet part can be reliably pressed against the engine cover.

Here, if the clamping screw is positioned eccentrically from the central axis of the main body to the side opposite to the lead wire, the lead wire will interfere with the work when the grommet part is fixed to the engine cover. In addition, the work can be easily performed.

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

  1 is a cross-sectional view of a magnet generator according to an embodiment of the present invention, FIG. 2 is a plan view of a main part of the magnet generator, FIG. 3 is a cross-sectional view of a collar, and FIG. 4 is a grommet plate. FIG. 5 is a cross-sectional view of the collar with a grommet plate, FIG. 6 is a cross-sectional view of the main body of the grommet part, FIG. 7 is a view taken along the arrow VII in FIG. 6, and FIG. FIG. 9 is a cross-sectional view for explaining a method for attaching the main body of the grommet part to the engine cover, FIG. 10 is a cross-sectional view for explaining how to use the anti-rotation jig, and FIG. 1 shows an XI arrow view.

  1 and 2, reference numeral 1 denotes an engine crankshaft, 2 denotes an engine case, and 3 denotes an engine cover attached to the engine case 2 with a fastening screw 4.

  A rotor 5 is fixed to the end 1 a of the crankshaft 1, and a stator 6 is disposed inside the rotor 5.

  The rotor 5 includes a rotating member 51 made of a magnetic material. The rotary member 51 is finished by cutting after hot forging. A tapered portion 51 b is formed inside the central boss portion 51 a of the rotating member 51, and the tapered portion 51 b is fitted and fixed to the crankshaft end 1 a by a bolt 52. A plurality of cooling through holes 51 d are provided in the end surface portion 51 c of the rotating member 51. A cylindrical outer peripheral portion 51e of the rotating member 51 constitutes a yoke. A ring-shaped spacer 53 made of a non-magnetic material, a plurality of permanent magnets 54 arranged at equal intervals in the circumferential direction, and a non-magnetic press-fitted into the rotating member outer peripheral portion 51e inside the rotating member outer peripheral portion 51e. A ring-shaped positioning case 55 made of a body is disposed in order along the axial direction of the crankshaft 1. The plurality of permanent magnets 54 are positioned at equal intervals in the circumferential direction by convex portions (not shown) formed in the positioning case 55, and a magnet protection ring 56 is press-fitted inside the permanent magnet 54. The distal end portion 51f of the rotating member outer peripheral portion 51e is fixed to the rotating member 51 by winding and caulking. The magnet protection ring 56 is formed by pressing a stainless steel plate.

  The stator 6 includes a laminated core 61. The laminated core 61 is formed by laminating a plurality of pressed iron plates and caulking rivets (not shown). The surface of the laminated core 61 is insulated with an epoxy resin or the like, and a power generation coil 62 is formed by winding a copper wire for winding around the laminated core 61. The stator 6 is inserted into the engine cover 3 by passing a tightening screw 63 through a screw insertion through hole 61 a formed in the laminated core 61 and screwing the tightening screw 63 into a screw hole 3 a formed in the engine cover 3. It is fixed.

  The power generation coil 62 is connected to the lead wire 65 in the insulating tube 64. The insulating tube 64 is held by a clip 66 that is screwed to the laminated core 61. The lead wire 65 drawn out from the insulating tube 64 is protected by the protective tube 67 and extends to the grommet portion 7, and is drawn out through the grommet portion 7. The protective tube 67 is pressed and fixed to the inner surface of the engine cover 3 by a lead wire fixing clamp 68.

  The grommet portion 7 is fixed to the grommet mounting through hole 31 of the engine cover 3.

  The grommet portion 7 includes a main body portion 71 (FIGS. 1, 6, and 9), a presser plate 72 (FIGS. 1 and 11), and a fastening screw 73 (FIGS. 1 and 11).

  The main body 71 includes a grommet plate 74 (FIG. 4) made of an iron material, a collar 75 (FIG. 3) made of an iron material and having an internal thread (screw hole) 75a formed on the inner surface thereof, and a lead wire drawing through made of a rubber material. And a seal portion 77 (FIG. 6) having a hole 77a. The main body 71 is manufactured by integrally molding the seal portion 77 using a collar 78 with a grommet plate (FIG. 5) formed by welding a grommet plate 74 to the collar 75 by resistance welding or the like. At the time of manufacturing, the lead wire drawing through hole 77a is formed in the seal portion 77 by the core. The seal portion 77 has a tapered surface 77 b that decreases in diameter toward the outer direction of the engine cover 3. The outer diameter of the tapered surface 77b is set to be larger than the inner diameter of the tapered surface forming the main body accommodating hole 31a that constitutes a part of the through hole 31 for attaching the grommet, and is previously tightened to both the tapered surfaces 77b and 31a. A fee (press-fitting fee) is made. Further, the seal portion 77 has at least two rotation stopper jig insertion recesses 77c (FIGS. 8 and 10) at the rear portion.

  The presser plate 72 is housed in a presser plate housing hole 31 b that forms part of the grommet mounting through hole 31. The holding plate accommodating hole 31b is formed to extend from the main body accommodating hole 31a and has a larger diameter than the main body accommodating hole 31a. The holding plate 72 has a groove 72a for allowing the lead wire 65 to be pulled out to the outside, and the holding plate 72 has a screw insertion hole through which a fastening screw 73 screwed into the collar 75 from the outside of the engine cover 3 is passed. 72b is formed. As shown in FIG. 11, the fastening screw 73 is eccentrically positioned by a predetermined amount A from the central axis O to the opposite side of the lead wire 65.

  The tightening screw 73 is screwed into the screw hole 75 a of the collar 75 with the presser plate 72 interposed therebetween, and the presser plate 72 and the main body 71 are integrated and fixed to the engine cover 3.

  Next, an attachment method for attaching the grommet portion 7 to the engine cover 3 will be described with reference to FIG.

  As shown in FIG. 9, the main body 71 in which the lead wire 65 is inserted into the lead wire drawing through hole 77 a is partially inserted into the main body housing hole 31 a from the inside of the engine cover 3, and the presser plate 72 is received from the outside of the engine cover 3 in the holding hole 31b for the presser plate, the male screw portion 73b of the tightening screw 73 is passed through the screw insertion hole 72b of the presser plate 72, and then screwed into the screw hole 75a of the collar 75. At this time, the arm portion 100a of the anti-rotation jig 100 is inserted into each of the anti-rotation jig insertion recesses 77c of the seal portion 77 so that the main body 71 does not rotate when the tightening screw 73 is turned. . When the tightening screw 73 is turned, as the tightening screw 73 is screwed into the screw hole 75a of the collar 75, the seal portion 77 of the main body portion 71 is compressed while being compressed by the tapered surface of the main body portion accommodating hole 31a. Approach the plate 72. The main body 71, the presser plate 72, and the tightening screw 73 are integrated to form the grommet portion 7, and the grommet portion 7 is fixed to the engine cover 3.

  When the grommet portion 7 is fixed to the engine cover 3 and an impact due to severe vibration is applied to the grommet portion 7, the surface 72 c (FIG. 1) of the presser plate 72 and the surface 31 c (FIG. 9) of the engine cover 3 are By maintaining the pressure contact, it is possible to prevent the grommet portion 7 from moving inward of the engine cover 3. Further, the seal portion 77 is accommodated and held in the main body accommodating hole 31a, and the annular stepped portion 77d (FIG. 9) of the seal portion 77 is the inner surface 3b (FIG. 9) of the peripheral edge of the main body accommodating hole 31a of the engine cover 3. Since the grommet mounting through-hole 31 is in press contact with the peripheral edge portion, the sealing performance can be sufficiently secured, and the grommet portion 7 can be prevented from moving outward from the engine cover 3. Can be firmly fixed to the engine cover 3.

  Further, in a state where the grommet portion 7 is fixed to the engine cover 3, the seal portion 77 is in press contact with the main body portion accommodation hole 31a and the collar 75 by tightening allowance. Sealing performance between the hole 31a and the collar 75 can be ensured, and leakage of engine oil from the inside of the engine case 2 to the outside and intrusion of water from the outside to the engine case 2 can be prevented.

  As described above, the magnet generator according to the present embodiment is attached to the engine cover 3 that fixes the stator 6 to the inside and is fixed to the engine case 2, and is connected to the power generation coil 62 of the stator 6. In the magnet generator including the grommet portion 7 for pulling out the lead wire 65 to the outside of the engine cover 3, the engine cover 3 has a grommet mounting through-hole having a tapered surface that decreases in diameter from the inside toward the outside. 31, and the grommet portion 7 includes a main body portion 71 having a collar 75 having a screw hole 75 a and a seal portion 77 integrated so as to surround the collar 75, and a male screw portion 73 b screwed into the screw hole 75 a of the collar 75. And a screw insertion hole 72b through which the male threaded portion 73a of the tightening screw 73 passes and the grommet mounting through hole 31. A pressure plate 72 that is crimped to the outer surface of the surrounding engine cover 3, and the seal portion 77 has an annular step portion 77 d that has a tightening margin with the tapered surface 31 a of the through hole 31 for attaching the grommet, and rotates around the rear portion. There is a recess 77c for inserting a fixing jig, and the main body 71 is inserted into the grommet mounting through-hole 31 from the inside of the engine cover 3 and the male threaded portion 73a of the tightening screw 73 from the outside of the engine cover 3 By threading the male screw portion 73a into the screw hole 75a of the collar 75 of the main body portion 71 with the anti-rotation jig 100 inserted in the concave portion 77c for inserting the anti-rotation jig of the seal portion 77 through the screw insertion hole 72b, the grommet The part 7 is integrated and fixed to the grommet mounting through-hole 31 at the same time. For this reason, the grommet part 7 can be fixed to the engine cover 3 by an extremely simple operation. Further, in a state where the grommet portion 7 is fixed to the engine cover 3, the seal portion 77 is provided with an engine cover due to a tightening margin between the inner end of the tapered surface 31a of the through hole 31 for attaching the grommet and the annular stepped portion 77d. 3 is in a pressure contact state with the peripheral portion of the grommet mounting through hole 31, and a sufficient sealing property can be secured.

  Since the tightening screw 73 is eccentrically positioned on the opposite side of the lead wire 65 from the central axis of the main body 71, the lead wire 65 hinders the work when the grommet portion 7 is fixed to the engine cover 3. Therefore, the work can be easily performed.

  Further, the grommet plate 74 is welded to the collar 75 to form the collar 78 with the grommet plate, and the seal portion 77 is integrally formed with the collar 78 with the grommet plate as an insert body. 7 can be reliably pressed against the engine cover 3.

  The annular stepped portion 77d has a bulging shape with a substantially semicircular cross section in the above embodiment, but may be a flat shape.

It is sectional drawing of the magnet type generator which concerns on one Embodiment of this invention. It is a principal part top view of the same magnet type generator. It is sectional drawing of a color. It is a top view of a grommet board. It is sectional drawing of a collar with a grommet board. It is sectional drawing of the main-body part of a grommet part. FIG. 7 is a view taken along arrow VII in FIG. 6. FIG. 8 is a view taken along arrow VIII in FIG. 6. It is sectional drawing for demonstrating the operation | work method which attaches the main-body part of a grommet part to an engine cover. It is sectional drawing for demonstrating the usage method of a rotation prevention jig | tool. FIG. It is sectional drawing of the magnet type generator which concerns on a prior art example.

Explanation of symbols

2 Engine case 3 Engine cover 31 Grommet mounting through hole 31a Main unit accommodation hole (tapered surface)
6 Stator 62 Generator coil 65 Lead wire 7 Grommet portion 71 Body portion 72 Presser plate 72a Screw insertion hole 73 Tightening screw 73a Head portion 73b Male thread portion 74 Grommet plate 75 Collar 75a Screw hole 77 Seal portion 77c Concave portion 77d annular stepped portion 100 non-rotating jig

Claims (2)

A magnet generator having a grommet for fixing a stator to the inside and being attached to an engine cover fixed to an engine case, and for drawing out a lead wire connected to a power generation coil of the stator to the outside of the engine cover In
The engine cover includes a through hole for attaching a grommet having a tapered surface that decreases in diameter from the inside toward the outside,
The grommet portion and a grommet plate to be welded to the the integrated seal portion so as to surround the collar and the collar collar having one screw hole, formed the grommet plate is welded to the collar A body portion manufactured by integrally molding a seal portion using the formed collar with grommet plate as an insert body, one fastening screw having a male screw portion screwed into a screw hole of the collar, and a male screw of the fastening screw And a presser plate that is pressed against the outer surface of the engine cover around the through hole for attaching the grommet, and the seal portion is tightened between the tapered surface of the through hole for attaching the grommet. has a cash, also, the sealing portion, detent jig inserted into the rear and having an annular stepped portion having an interference between the inner end of the tapered surface Having a recess for
The main body portion is inserted into the grommet mounting through-hole from the inside of the engine cover, and the male screw portion of the tightening screw is passed through the screw insertion hole of the presser plate from the outside of the engine cover to prevent the seal portion from rotating. The grommet portion is integrated and simultaneously fixed to the through hole for attaching the grommet by screwing the male screw portion into the screw hole of the collar of the main body portion with the anti-rotation jig inserted in the tool insertion recess. This is a magnet generator.   2. The magnet generator according to claim 1, wherein the tightening screw is eccentrically positioned on a side opposite to the lead wire from a central axis of the main body.

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