JP2007306680A - Flywheel magnetic rotor for combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flywheel magnetic rotor enabling to position and attach a large-diameter mechanical part onto the bottom wall of a flywheel, without increasing the cost. <P>SOLUTION: A circumferential wall portion 102c is provided on one part of a boss member 102, attached on the bottom wall portion of a flywheel body 101 to use the external circumferential surface of the circumferential wall surface as a positioning surface 102c1, the internal circumferential portion of a circular positioning plate 5 is fitted on the positioning surface 102c1, and the positioning plate 5 is positioned coaxially with the flywheel body 101. A circular protruding portion, provided to the external circumferential side of the positioning plate 5 is used as a part-positioning portion 501, one part of the mechanical part 3 is fitted on the internal circumference of the part-positioning portion, and the mechanical part 3 is coaxially positioned with the flywheel body 101. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flywheel magnet rotor constituting a magnet type AC generator together with a stator attached to a crankshaft of an internal combustion engine and fixed to the case side of the engine.

  As shown in FIGS. 6 and 7, the flywheel magnet rotor 1 attached to the internal combustion engine includes a peripheral wall portion 101a and a bottom wall portion 101b provided so as to close one end side in the axial direction of the peripheral wall portion. And a boss member 102 manufactured by cold forging and attached to the center of the bottom wall portion 101b of the flywheel body 101. The boss member 102 is a crank for an internal combustion engine. A flywheel 103 coupled to the shaft and a permanent magnet 104 attached to the inner periphery of the peripheral wall portion of the flywheel main body 101 are provided.

  The illustrated boss member 102 integrally includes a cylindrical portion 102a having a tapered hole 102a1 in an axial center portion and a flange portion 102b formed at one end of the cylindrical portion 102a, and constitutes an outer peripheral portion of the flange portion 102b. Since the metal and the metal constituting the inner peripheral portion of the hole formed in the central portion of the bottom wall portion 101b of the flywheel main body are integrated by plastic flow (metal flow), the flange portion 102b is formed in the flywheel main body 101. Are joined to the bottom wall portion 101b of the. This type of magnet rotor is disclosed in Patent Document 1, for example.

  A stator 2 constituting a magnetic AC generator together with the flywheel magnet rotor 1 is wound around an armature core 201 having a magnetic pole portion opposed to the magnetic poles of the flywheel magnet rotor 1, and the armature core 201. The armature core 201 is fixed to a case or cover of an engine (not shown) with a bolt 203.

  The flywheel magnet rotor attached to the crankshaft of the internal combustion engine includes a clutch for turning on / off the transmission of power between the starter for starting the internal combustion engine and the crankshaft of the engine, and a cooling fan used for cooling the engine Often mechanical parts such as are attached. For example, when a recoil starter is used as a starting device for starting the engine, a one-way clutch of the recoil starter is attached to the outer surface of the bottom wall portion of the flywheel 103.

  The mechanical parts attached to the outer surface of the flywheel are usually arranged coaxially with the flywheel (with the central axis shared). Therefore, in the conventional flywheel magnet rotor, as shown in FIG. 6 and FIG. 7, the outer surface of the bottom wall portion of the flywheel body is formed by driving a part of the bottom wall portion of the flywheel outward. A plurality of positioning protrusions 105 arranged along a cylindrical surface sharing a central axis with the flywheel body are formed, and the outer peripheral portion of the mechanical component 3 such as a clutch is fitted to these positioning protrusions 105, 105,. By doing so, the mechanical component 3 is positioned coaxially with the flywheel 103. The machine part 3 positioned by the positioning protrusion 105 is fixed to the flywheel 103 by a bolt 4 screwed into the frame of the machine part 3 through an attachment hole h penetrating the bottom wall portion 101b of the flywheel body. .

  As described above, in order to provide a positioning projection for positioning the mechanical component 3 by punching out a part of the bottom wall portion of the flywheel main body 101, a portion where the positioning projection 105 of the bottom wall portion of the flywheel main body 101 is provided. Must be flat. If the diameter of the machine part to be positioned is large and the positioning part of the machine part needs to be provided on the outer peripheral part of the bottom wall part of the flywheel main body in a curved state, the positioning projection by launching is used as the positioning means. Cannot be used.

  Therefore, as shown in FIG. 8, a boss member 102 'having a large-diameter flange portion 102b' at one end of the cylindrical portion 102a 'is used, and the flange portion 102b' of this boss member is used as the bottom wall portion 101b of the flywheel body. It is proposed that a positioning portion 102b1 'is provided on the outer peripheral portion of the flange portion 102b' of the boss member. A flywheel magnet rotor in which a positioning part for mechanical parts such as a clutch is provided on the outer peripheral part of the flange of the boss member as described above is disclosed in Patent Document 2.

As shown in FIG. 8, the boss member 102 'having a large-diameter flange cannot be manufactured by cold forging, and must be manufactured by hot forging and finishing the entire surface thereof. .
JP 2001-45714 A JP 2001-136694 A

As described above, in the conventional flywheel magnet rotor, when the diameter of the machine part attached to the flywheel is large, it is necessary to increase the outer diameter of the flange portion 102b ′ of the boss member 102 ′ attached to the flywheel. The boss member 102 ′ must be manufactured by hot forging, and the entire surface must be finished, resulting in an increase in manufacturing cost of the boss member.

  An object of the present invention is to use a low-cost boss member manufactured by cold forging to position and attach a machine part having a large outer diameter to the bottom wall portion of the flywheel so as to be mounted. Is to provide.

  The present invention is attached to the center of a cup-shaped flywheel body having a peripheral wall portion and a bottom wall portion provided so as to close one end side in the axial direction of the peripheral wall portion, and the bottom wall portion of the flywheel main body. A flywheel having a boss member, the boss member being coupled to a crankshaft of an internal combustion engine, and a permanent magnet attached to the inner periphery of the peripheral wall portion of the flywheel main body. The flywheel magnet rotor for an internal combustion engine is mounted on the outer surface of the internal combustion engine with other mechanical parts attached with the center axis thereof aligned with the center axis of the flywheel.

  In the present invention, a positioning plate fitting portion having a positioning surface on the cylindrical surface sharing the central axis with the flywheel main body and facing the radial outside of the flywheel main body is formed in a part of the boss member, An annular positioning plate is provided in which the inner peripheral portion is fitted to the positioning surface of the positioning plate fitting portion and is positioned coaxially with the flywheel body. Further, a part positioning portion for fitting a part of the machine part and positioning the machine part coaxially with the flywheel body is provided on the outer peripheral side of the positioning plate.

  As described above, an annular positioning plate is provided in which the inner peripheral portion is fitted to the positioning surface of the positioning plate fitting portion formed in a part of the boss member and is positioned coaxially with the flywheel body. When a part positioning part is provided on the outer peripheral side of the positioning plate so that a part of the machine part is fitted to position the machine part coaxially with the flywheel body, the boss member has a small diameter flange. By using a positioning plate having a dimension corresponding to the outer diameter of the machine part, it is possible to cope with a machine part having any outer diameter. Therefore, an inexpensive cold forged product can be used as the boss member. Further, since the positioning plate may have a simple structure in which a component positioning portion for positioning by positioning a mechanical component on the outer peripheral side of the annular plate is provided, the processing cost of the positioning plate can be reduced. Therefore, it is possible to obtain a flywheel magnet rotor capable of attaching machine parts having various outer diameters to the outer surface of the bottom wall portion of the flywheel without increasing the cost of the flywheel magnet rotor.

  In the case where the boss member is used in which the flange portion is fastened to the bottom wall portion of the flywheel main body by a rivet, the outer peripheral surface of the flange portion of the boss member can be used as the positioning surface of the positioning plate fitting portion. .

  When using a boss member in which the flange portion is integrated and joined to the bottom wall portion of the flywheel body by plastic flow, the center axis line is shared with the flywheel body on the outer end surface of the flange portion of the boss member. By projecting the peripheral wall portion, the outer peripheral surface of the peripheral wall portion can be used as the positioning surface of the positioning plate fitting portion.

  The component positioning part of the positioning plate can be appropriately provided according to the configuration of the positioning part on the machine component side to be attached. For example, when the positioning part of a machine part is provided on the inner periphery of the machine part, the outer periphery of the positioning plate is used as the part positioning part, and the positioning part provided on the machine part is fitted to the outer periphery of the positioning plate. By doing so, it is possible to adopt a configuration in which the machine part is positioned coaxially with the flywheel body.

  Further, the component positioning part is constituted by an annular positioning protrusion extending along the outer periphery of the positioning plate, or at least three positioning protrusions provided so as to be arranged at equal angular intervals on the outer periphery of the positioning plate. The mechanical part may be positioned coaxially with the flywheel body by fitting a positioning part provided in the mechanical part into the positioning protrusion from the inside.

  Mechanical parts attached to the bottom wall portion of the flywheel include a fan for cooling the internal combustion engine, a clutch for turning on / off the transmission of power between the starter for starting the internal combustion engine and the crankshaft, and the like.

  As described above, according to the present invention, the annular positioning in which the inner peripheral portion is fitted to the positioning surface of the positioning plate fitting portion formed in a part of the boss member and is positioned coaxially with the flywheel main body. Since a plate is provided and a part positioning part is provided on the outer peripheral side of the positioning plate so that a part of the machine part is fitted and the machine part is positioned coaxially with the flywheel body. A machine part having any outer diameter dimension can be attached simply by using a part having a small diameter and using a positioning plate having a dimension corresponding to the outer diameter dimension of the machine part. Therefore, flywheel magnet rotation that can attach machine parts having various outer diameters to the outer surface of the bottom wall portion of the flywheel without incurring an increase in cost by using an inexpensive cold forged product as a boss member You can get a child.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show a preferred embodiment of the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a right side view of FIG. In these drawings, parts that are the same as those in FIGS. 6 and 7 are given the same reference numerals. 1 and 2, reference numeral 101 denotes a cup-shaped flywheel body having a peripheral wall portion 101a and a bottom wall portion 101b provided so as to close one end side in the axial direction of the peripheral wall portion. A boss member integrally having a flange portion 102b formed on one end side in the axial direction of the cylindrical portion, and these are made of a ferromagnetic material such as iron or an iron alloy. The flywheel body 101 is manufactured by casting or drawing, and the boss member 102 is manufactured by cold forging.

  The flange portion 102b of the boss member 102 has a plastic flow (metal flow) between the metal constituting the outer peripheral portion and the metal constituting the inner peripheral portion of the hole formed in the central portion of the bottom wall portion 101b of the flywheel main body 102. By being integrated, the bottom wall portion 101b of the flywheel main body 101 is joined. An arc-shaped or ring-shaped (ring-shaped in the illustrated example) permanent magnet 104 is fixed to the inner periphery of the peripheral wall portion 101a of the flywheel main body 101 by bonding, bolting, or the like. The flywheel body 101 and the boss member 102 constitute a flywheel 103, and the flywheel 103 and the permanent magnet 104 constitute a flywheel magnet rotor 1. The flywheel magnet rotor 1 is attached to the engine by coupling the boss member 102 to the crankshaft of the internal combustion engine.

  In the present embodiment, a positioning peripheral wall portion 102 c that shares the central axis with the flywheel main body 101 is projected from the outer end surface of the flange portion 102 b of the boss member 102. The positioning peripheral wall portion 102c constitutes a positioning plate fitting portion, and the outer peripheral surface thereof is a positioning surface 102c1.

  In the present embodiment, a positioning plate 5 as shown in FIG. The illustrated positioning plate 5 is formed in an annular shape, and its inner peripheral portion 5a is fitted to the positioning surface 102c1 of the positioning peripheral wall portion (positioning plate fitting portion) 102c and positioned coaxially with the flywheel main body 101. The The accuracy of fitting between the positioning plate 5 and the peripheral wall portion 102c for positioning is set to an accuracy necessary for ensuring a predetermined positioning accuracy of the machine part.

  The positioning plate 5 may be separated from the flywheel in a state before the mechanical parts are attached, or may be fixed to the flywheel so as not to be separated from the flywheel. When the positioning plate 5 is fixed to the flywheel 103, the outer periphery of the positioning peripheral wall portion 102c of the boss member is press-fitted or shrink-fitted into the inner periphery of the positioning plate 5. The height of the positioning peripheral wall portion 102c is set so that the positioning peripheral wall portion 102c of the boss member protrudes outward from the plate surface of the positioning plate 5, and the outer peripheral edge of the positioning peripheral wall portion 102c is used as the positioning plate. The positioning plate 5 may be fixed to the boss member 102 by performing a caulking process in which it is pushed out and crimped to the inner peripheral edge side.

  A portion of the positioning plate 5 near the outer periphery is fitted with a part of a mechanical part 3 such as a clutch for an engine starting device or a cooling fan for cooling the engine, and the mechanical part is coaxial with the flywheel body 101. A component positioning portion 501 is provided for positioning. Further, the portion of the positioning plate 5 closer to the inner periphery than the component positioning portion 501 is aligned with the mounting hole h provided in the bottom wall portion of the flywheel main body 101 in order to pass the bolt that fastens the mechanical component 3 to the flywheel. A bolt insertion hole h ′ is formed.

  In the illustrated example, the component positioning portion 501 is formed of an annular protruding portion that protrudes from the plate surface of the positioning plate 5 to the opposite side of the flywheel, and the outer peripheral surface 3 a of the mechanical component 3 is the inner periphery of the component positioning portion 501. By being fitted to 501a, the mechanical component 3 is positioned coaxially with the flywheel 101 (in a state where the central axis is shared). Then, the machine part 3 is screwed into the machine part 3 by screwing the bolt 4 through the mounting hole h provided in the bottom wall portion of the flywheel body 101 and the bolt insertion hole h ′ provided in the positioning plate 5. It is fixed to the flywheel 103.

  A stator 2 constituting a magnetic AC generator together with the flywheel magnet rotor 1 is wound around an armature core 201 having a magnetic pole portion opposed to the magnetic poles of the flywheel magnet rotor 1, and the armature core 201. The armature core 201 is fixed to a case or cover of an engine (not shown) with a bolt 203.

  In the above embodiment, the component positioning portion 501 provided on the outer peripheral side of the positioning plate 5 is formed of an annular protruding portion. However, as shown in FIG. 3B, the outer peripheral portion of the positioning plate 5 is equiangularly spaced. The component positioning part may be constituted by at least three protruding parts 501 ', 501',.

  In the above embodiment, the mechanical component is coaxially positioned with respect to the flywheel by bringing the mechanical component into contact with the inner side of the component positioning portion 501 provided on the outer peripheral side of the positioning plate 5. 4, the machine part 3 is coaxial with the flywheel by fitting the positioning part 3a 'on the machine part 3 side to the circumference 5b of the positioning board 5 by using the outer circumference 5b of the positioning board 5 as a part positioning part. Alternatively, the positioning may be performed.

  In the above embodiment, the metal constituting the flange 102b of the boss member 102 and the metal constituting the bottom wall portion of the flywheel main body 101 are integrated by plastic flow to attach the boss member 102 to the flywheel main body 101. However, as shown in FIG. 5, the present invention can also be applied to the case where the flange portion 102 b of the boss member 102 is fastened to the bottom wall portion 101 b of the flywheel main body 101 by a rivet 106. In this case, the flange portion 102b of the boss member 102 is used as a positioning plate fitting portion, and its outer peripheral surface is used as a positioning surface 102c1 for positioning the positioning plate 5.

It is the longitudinal cross-sectional view which showed the structure of embodiment of this invention. It is a right view of FIG. (A) And (B) is the longitudinal cross-sectional view which showed the example from which the positioning plate used by this invention differs, respectively. It is the longitudinal cross-sectional view which showed the structure of other embodiment of this invention. It is the longitudinal cross-sectional view which showed the structure of further another embodiment of this invention. It is the longitudinal cross-sectional view which showed the prior art example. FIG. 7 is a right side view of FIG. 6. It is the longitudinal cross-sectional view which showed the other conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flywheel magnet rotor 101 Flywheel main body 101a Peripheral wall part 101b Bottom wall part 102 Boss member 102a Boss member cylinder part 102b Boss member flange part 102c1 Positioning surface 103 Flywheel 104 Permanent magnet 3 Machine part

Claims (7)

A cup-shaped flywheel body having a peripheral wall portion and a bottom wall portion provided so as to close one end side in the axial direction of the peripheral wall portion, and a boss member attached to the center of the bottom wall portion of the flywheel main body. A flywheel having the boss member coupled to a crankshaft of an internal combustion engine, and a permanent magnet attached to the inner periphery of the peripheral wall portion of the flywheel main body, the outer surface of the bottom wall portion of the flywheel main body In a flywheel magnet rotor for an internal combustion engine in which another mechanical component is mounted with its center axis aligned with the center axis of the flywheel, the flywheel magnet rotor is mounted on a cylindrical surface sharing the center axis with the flywheel body. A positioning plate fitting portion having a positioning surface facing the outside in the radial direction of the flywheel body is formed on a part of the boss member,
An annular positioning plate is provided in which an inner peripheral portion is fitted to a positioning surface of the positioning plate fitting portion and is positioned coaxially with the flywheel body,
A part positioning part for fitting a part of the machine part and coaxially positioning the machine part with the flywheel body is provided on the outer peripheral side of the positioning plate;
A flywheel magnet rotor for an internal combustion engine. The boss member has a flange portion at one end thereof, and the flange portion is fastened to the bottom wall portion of the flywheel body by a rivet,
The flywheel magnet rotor for an internal combustion engine according to claim 1, wherein an outer peripheral surface of the flange portion of the boss member is a positioning surface of the positioning plate fitting portion. The boss member has a flange portion at one end thereof, and the metal constituting the flange portion and the metal constituting the bottom wall portion of the flywheel body are integrated by plastic flow so that the flange portion of the boss member is Attached to the bottom wall of the flywheel body,
The peripheral wall part which shares the said flywheel main body and a central axis line protrudes in the outer end surface of the flange part of the said boss member, The outer peripheral surface of this peripheral wall part is a positioning surface of the said positioning plate fitting part. 2. A flywheel magnet rotor for an internal combustion engine according to 1.   An outer periphery of the positioning plate serves as the component positioning portion, and a positioning portion provided on the mechanical component is fitted to an outer periphery of the positioning plate so that the mechanical component is positioned coaxially with the flywheel body. The flywheel magnet rotor for an internal combustion engine according to claim 1, 2 or 3.   The component positioning portion comprises an annular positioning protrusion extending along the outer periphery of the positioning plate or at least three positioning protrusions provided so as to be arranged at equiangular intervals on the outer periphery of the positioning plate, 4. The internal combustion engine according to claim 1, wherein a positioning portion provided in the mechanical component is fitted into the positioning protrusion from the inside so that the mechanical component is positioned coaxially with the flywheel body. Flywheel magnet rotor.   The flywheel magnet rotor for an internal combustion engine according to any one of claims 1 to 5, wherein the mechanical component is a cooling fan. The flywheel magnet rotor for an internal combustion engine according to any one of claims 1 to 5, wherein the mechanical component is a clutch for turning on and off transmission of power between a starting device for starting the internal combustion engine and the crankshaft. .

Images