EP1775040A1 - Apparatus for forming triggering projections in flywheel, and method of forming projections for triggering - Google Patents
Apparatus for forming triggering projections in flywheel, and method of forming projections for triggering Download PDFInfo
- Publication number
- EP1775040A1 EP1775040A1 EP05768817A EP05768817A EP1775040A1 EP 1775040 A1 EP1775040 A1 EP 1775040A1 EP 05768817 A EP05768817 A EP 05768817A EP 05768817 A EP05768817 A EP 05768817A EP 1775040 A1 EP1775040 A1 EP 1775040A1
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- EP
- European Patent Office
- Prior art keywords
- guide body
- yoke
- cylindrical portion
- forming
- projections
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming
Definitions
- the present invention relates to a technical field of an apparatus and method for forming a triggering projection in a flywheel to be fitted on a rotation axis to detect the rotational state thereof.
- flywheels of this kind there has generally been known a type in which a permanent magnet is provided on the inner periphery of the cylindrical portion of a yoke that is formed in a bottomed cylindrical shape and a plurality of projections for receiving trigger signals (hereinafter referred to as "triggering projections") are formed circumferentially in a projecting manner outward from the outer peripheral surface of the cylindrical portion, such a flywheel being adapted to be fitted integrally over the rotation axis of an actuator, while a sensor being provided facing the cylindrical portion of the yoke to detect a magnetized projection (trigger) using the sensor and thereby the rotational state of the rotation axis (the driving state of the actuator) is detected.
- triggering projections a plurality of projections for receiving trigger signals
- a triggering projection is formed through the first punching step in which an acute-angled projection is preliminarily formed to project significantly outward and the second punching step in which the projection is retreated inward to be a circular shape, which thus requires two punching steps, resulting in a problem in that the number of working processes is increased.
- the present invention has been made in consideration of the above-described circumstances and to solve the problems.
- the first aspect of the invention provides an apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel, said triggering projections being projected toward the outer diameter side of the yoke by punching, the forming apparatus comprising: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form a projection by the punch, wherein the inner guide body is connected with an auxiliary guide body extending outside the
- the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- the second aspect of the invention provides the forming apparatus according to the first aspect of the invention, wherein the auxiliary guide body is adapted to receive the punching force of the outer guide body via a spring, whereby the punching force of the outer guide body can be set larger.
- the third aspect of the invention provides the forming apparatus according to the first or second aspect of the invention, wherein the auxiliary guide body is adapted to be pressurized by an outer auxiliary guide body provided integrally on the outer guide body, whereby the complete roundness of the yoke can be further ensured.
- the fourth aspect of the invention provides the forming apparatus according to any of the first to third aspects of the invention, wherein the punch is provided integrally on a fixed guide body to be fixed outside the cylindrical portion of the yoke, whereby the punching force can be set much larger.
- the fifth aspect of the invention provides the forming apparatus according to any of the first to fourth aspects of the invention, wherein a rotational guide body is provided relatively rotatably in the inner guide body, the yoke being adapted to be incorporated into the inner guide body via the rotational guide body, whereby the yoke can be rotated easily relative to the inner guide body.
- the sixth aspect of the invention provides the forming apparatus according to the fifth aspect of the invention, wherein between the rotational guide body and the inner guide body is provided positioning means for positioning the rotational guide body against the inner guide body, whereby the yoke can be rotated while positioned against a projection.
- the seventh aspect of the invention provides the forming apparatus according to the sixth aspect of the invention, wherein the positioning means is adapted to be interlocked with the pressurizing operation of the outer guide body, whereby it is possible to form a projection accurately and reliably.
- the eighth aspect of the invention provides a method for forming triggering projections on a flywheel, wherein an apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel with the triggering projections being projected toward the outer diameter side of the yoke by punching, comprises: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form the projection by the punch; and an auxiliary guide body being connected to the inner guide body and extending outside the cylindrical portion of the yoke, said method
- the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- the punching force of the outer guide body can be set larger.
- the complete roundness of the yoke can be further ensured.
- the punching force can be set much larger.
- the yoke can be rotated easily relative to the inner guide body.
- the yoke can be rotated while positioned against a projection.
- the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- the numeral 1 indicates a flywheel adapted to be fitted over the crankshaft of the engine of a motorcycle, the flywheel 1 comprising a yoke 2 formed of ferromagnetic material (e.g. iron) in a bottomed cylindrical shape, and on the inner peripheral surface of the cylindrical portion 2a of the yoke 2 is provided a magnet holder 3 via integrating means such as adhesive, the magnet holder 3 and a holder pin 3a disposed on the opening side of the cylindrical portion 2a supporting multiple pairs of permanent magnets 4.
- ferromagnetic material e.g. iron
- the boss plate 5 comprises a disk-shaped plate portion 5a and a boss cylindrical portion 5b positioned around the central axis of the plate portion 5a to be fitted and joined to the through hole 2c of the yoke.
- the boss cylindrical portion 5b projects from the through hole 2c to inside the cylindrical portion 2a of the yoke (toward the cylindrical bottom portion 2b) when fixed integrally to the yoke 2, the cylindrical hole 5d being formed in such an inclined manner that the hole diameter decreases the closer to the opening side of the cylindrical portion 2a of the yoke, and further in the cylindrical hole 5d being carved a key groove 5e.
- the thus arranged flywheel 1 is adapted to be connected interlockingly with a crankshaft so as not to be rotated by allowing the boss cylindrical portion 5b to be fitted over the crankshaft via the key groove 5e.
- the flywheel 1 is formed by incorporating required members such as permanent magnets 4 into the yoke 2 with the projections 2e formed preliminarily on the outer periphery thereof by punching the cylindrical portion 2a.
- a triggering projection forming apparatus 7 embodying the present invention is employed as means for thus forming triggering projections 2e on the cylindrical portion 2a of the yoke.
- a fixed guide body 9 and an inner guide body 10 are provided on a fixed pedestal 8 that constitutes a fixed side in the forming apparatus 7 to be butted from within the yoke to the inner peripheral surface of the cylindrical portion 2a of the yoke according to the present invention.
- the square rear end portion 9a (the left portion in the side cross-sectional view of Fig. 3 and leading end portion in the direction of incorporation of the yoke 2) of the fixed guide body 9 is fixed integrally to the fixed pedestal 8 via a vertically oriented fixing bolt 8a.
- the front end portion 9b of the fixed guide body 9 is formed while keeping a predetermined clearance against the upper surface of the fixed pedestal 8, where the yoke 2 is adapted to be fitted over the front end portion 9b by incorporating the lower part of the cylindrical portion 2a of the yoke 2 into the clearance.
- a recessed portion 9c for integrally fixing a punch 11 according to the present invention thereto is provided in the front end portion 9b in a recessed manner rearward, and the punch 11 comprises: a rectangular base portion 11a provided in the lower end portion thereof; and a body portion 11b projecting upward from the upper end surface of the base portion 11a and adapted to form a projection 2e on the yoke 2, the rectangular base portion 11a being fixed to the recessed portion 9c of the fixed guide body via a fixing bolt 9d.
- the body portion 11b is disposed in such a manner, when the punch 11 is in a fixed state, as to project upward from the upper surface of the front end portion 9b (fixed guide body 9) and that the front end surface of the punch 11 is flush with the front end surface of the fixed guide body 9.
- the inner guide body 10 comprises a guide body portion 10b having a circular outer peripheral surface 10a with the same curvature as that of the inner peripheral surface of the cylindrical portion 2a of the yoke so as to be butted against the inner peripheral surface except for the lower part of the cylindrical portion 2a of the yoke, and with a longitudinal length greater than the cylindrical length of the yoke 2.
- the inner guide body 10 is provided integrally with a disk portion 10d positioned in the front end of the guide body portion 10b and comprising a boss portion 10c that is provided concentrically with the yoke 2 to be fitted thereon.
- the guide body portion 10b are also formed a rectangular recessed portion 10e opened downward and a through hole 10f through which the body portion 11b of the punch moves vertically. It is then arranged as will be described hereinafter that when the inner guide body 10 is incorporated so that the body portion 11b of the punch is inserted into the through hole 10f, the recessed portion 10e is to be fitted freely over the front end portion 9b of the fixed guide body 9 and the rear surface of the disk portion 10d is to be disposed close to and facing the front surface of the punch 11, so that the inner guide body 10 and the fixed guide body 9 can move vertically relatively to each other.
- auxiliary guide body 12 is formed as an elongated member comprising supporting piece portions 12a extending leftward and rightward from the yoke 2, and is provided with the upper surface which exists in the same position as the upper tangent of the circular plane 10a of the inner guide body as shown in the front elevational view of the forming apparatus 7 in Fig. 5.
- a recessed portion 12b having the same shape as that of the recessed portion 10e formed in the guide body portion 10b, the recessed portion 12b being adapted to fit the rear end portion 9a of the fixed guide body 9 thereinto freely.
- a pair of guide bolts 12c run through each of the left and right supporting piece portions 12a of the auxiliary guide body 12 in such a manner as to be fitted freely thereinto and not to come out thereof, where the base end portion of the guide bolts 12c is fixed to the fixed pedestal 8.
- each guide bolt 12c is fitted a vertically long coil spring 13 between the lower surface of the auxiliary guide body 12 and the upper surface of the fixed pedestal 8, whereby the auxiliary guide body 12 is supported on the fixed pedestal 8 together with the inner guide body 10 connected integrally with the auxiliary guide body 12 while being supported by the coil springs 13.
- the coil springs 13 are adjusted in such a manner that the triggering projection forming apparatus 7 is fixed integrally in the fixed guide body 9 and that the upper end of the body portion 11b of the punch that runs through the inner guide body 10 does not project from (e.g. is brought into approximately the same plane as, namely is flush with) the upper end surface of the auxiliary guide body 12 and the inner guide body 10 when the triggering projection forming apparatus 7 is in a non-operational state where a movable side member to be described hereinafter is not operated (indicated by the virtual line in Fig. 7).
- a vertical clearance S is formed between the recessed portions 10e, 12b of the inner guide body 10 and the auxiliary guide body 12 and the upper end surface of the fixed guide body 9 so that the inner guide body 10 and the auxiliary guide body 12 are allowed to move downward toward the fixed guide body 9 by the clearance S as a punching margin, and that the clearance S has a vertical dimension larger than the amount of projection of the projections 2e.
- the rotational guide body 14 comprises: a disk-shaped disk portion 14a having a diameter smaller than the outer diameter of the disk portion 10d of the inner guide body; and a supporting cylindrical portion 14b projecting forward along the central axis of the disk portion 14a. Then, the rear end portion of the supporting cylindrical portion 14b is adapted to fit the boss portion 10c of the inner guide body thereinto relatively rotatably so that the disk portion 10d of the inner guide body is incorporated concentrically into the rotational guide body 14.
- the rotational guide body 14 and the inner guide body 10 are adapted to be connected relatively rotatably with each other by threadably fitting the leading end of a fastening bolt 15, which is inserted from in front of and runs relatively rotatably through the supporting cylindrical portion 14b, into the boss portion 10c.
- the head portion 15a of the fastening bolt 15 is adapted to be butted against a stepped portion 14c formed inside the supporting cylindrical portion 14b to prevent the rotational guide body 14 from coming out forward of the inner guide body 10.
- the numeral 17 indicates a locking pin to be installed in the inner guide body 10 in a longitudinally oriented manner, the leading end of the locking pin 17 being arranged retractable forward from the disk portion 10d of the inner guide body, and adapted to be disengageably engaged with a spherical engaging recessed portion 14f formed in a preset position in the outer diameter portion of the rotational guide body 14.
- a spherical engaging recessed portion 14f formed in a preset position in the outer diameter portion of the rotational guide body 14.
- a positioning device (corresponding to the positioning means of the present invention) 18 for positioning and engaging the rotational guide body 14 against the inner guide body 10 facing the projections 2e.
- the positioning device 18 comprises: a pin shaft 18a provided longitudinally movably in a longitudinally long hole that allows the inner guide body 10 and the auxiliary guide body 12 to communicate with each other with the leading end thereof adapted to be engaged disengageably with one of the engaging recessed holes 14e formed in the disk portion 14a of the rotational guide body; an urging spring 18b for urging the pin shaft 18a toward the rotational guide body 14; and a detection sensor 18c adapted to output a detection signal when the pin shaft 18a is engaged with one of the engaging recessed holes 14e based on the urging force of the urging spring 18b.
- the yoke 2 when incorporating the yoke 2 into the inner guide body 10 to be in a preset forming set state, the yoke 2 is to be incorporated by inserting the positioning pins 16 projecting from the rotational guide body 14 into the two preset caulking through holes 2d, where in the outer diameter portion on the cylindrical bottom portion 2b of the yoke are formed circumferentially four positioning pieces 2f projecting cylindrically inward, whereby the yoke 2 is to be incorporated integrally into the rotational guide body 14 (inner guide body 10) while positioned rotationally so as not to be rotated by allowing the positioning pieces 2f to be fitted freely into the positioning recessed portions 14d formed in the outer peripheral portion of the disk portion 14a of the rotational guide body as well as the positioning pins 16 to be incorporated penetratingly into the caulking through holes 2d.
- the yoke 2 is positioned concentrically with the rotational guide body 14 in the forming set (incorporated) state above, and that thus incorporating the yoke 2 allows the inner peripheral surface of the cylindrical portion 2a of the yoke to be brought into contact with, at least, the circular plane 10a of the inner guide body as indicated by the virtual line in Fig. 7.
- the pin shaft 18a of the positioning device 18 is adapted to be engaged with one engaging recessed hole 14e positioned in one rotational end portion (leading the rotation of the rotational guide body 14) among the nine holes 14e formed in the rotational guide body 14 (refer to Fig. 5).
- the auxiliary guide body 12 arranged in the rear end portion of the inner guide body 10 is disposed outside the cylindrical portion of the yoke 2.
- the upper movable pedestal 19 that constitutes the triggering projection forming apparatus 7 as a movable side member (die) is interlocked with operating means not shown in the figures vertically (in the punching direction for the projections 2e) movably.
- an outer guide body 20 positioned forward facing the inner guide body 10 to be butted against the outer peripheral surface of the cylindrical portion 2a of the yoke and an outer auxiliary guide body 21 positioned rearward to be butted against the upper surface of the auxiliary guide body 12.
- an abutting surface 20a having the same curvature as the outer diameter of the cylindrical portion 2a of the yoke, the abutting surface 20a being adapted to have a circumferential length not to interfere with the projections 2e to be formed adjacently to the cylindrical portion 2a of the yoke.
- a punch receiving groove 20b facing the projections 2e in a recessed manner.
- the outer auxiliary guide body 21 comprises a flat abutting surface 21a to be butted against the flat upper surface of the auxiliary guide body 12, the abutting surface being adapted to move vertically integrally with the outer guide body 20 based on the vertical movement of the movable pedestal 19 and to pressurize the auxiliary guide body 12 when the outer guide body 20 pressurizes (applies punching force to) the outer peripheral surface of the cylindrical portion 2a of the yoke.
- the movable pedestal 19 is adapted to move downward (the outer guide body 20 is adapted to apply punching force) based on the input of a detection signal from the detection sensor 18c that constitutes the positioning device 18, whereby the outer guide body 20 performs no pressurizing operation with no detection signal input, which allows the projections 2e to be formed accurately and reliably.
- the pin shaft 18a of the positioning device 18 is engaged with one engaging recessed hole 14e positioned in one rotational end portion as mentioned above, where the downward movement of the movable pedestal 19 allows the outer guide body 20 to pressurize the outer peripheral surface of the cylindrical portion 2a of the yoke to apply punching force to the inner guide body 10, whereby the inner guide body 10 is to move downward, and the punch 11, which does not project from the circular plane 10a of the inner guide body 10 in the forming set state, is to project from the circular plane 10a of the inner guide body, and thus the body portion 11b of the punch is to press up the inner peripheral surface of the cylindrical portion 2a of the yoke to form the first projection 2e at the punch receiving groove 20b of the outer guide body 20 (refer to the solid lines in Fig. 3, Fig. 4, Fig. 5, and Fig. 7).
- the outer guide body 20 is to pressurize the cylindrical portion 2a of the yoke to move the inner guide body 10 downward and thereby to form the projection 2e, where the punching force acting on the inner guide body 10 is to be received by the coil springs 13 against the urging force through the auxiliary guide body 12 positioned outside the cylindrical portion of the yoke 2.
- the forming apparatus 7 is arranged in such a manner that the punching force of the outer guide body 20 can be received by the coil springs 13 that are positioned outside the cylindrical portion of the yoke 2 and supported on the fixed pedestal 8, whereby the yoke 2 cannot be interfered with even if the punching force of the outer guide body 20 may be increased, which allows the projections 2e to be formed with a large punching force.
- the outer guide body 20 is adapted to move downward together with the outer auxiliary guide body 21 positioned rearward, where the outer guide body 20 is to pressurize the cylindrical portion 2a of the yoke and the outer auxiliary guide body 21 is to pressurize the auxiliary guide body 12.
- the auxiliary guide body 12 is also pressurized by the outer auxiliary guide body 21 to move downward, resulting in that both the inner guide body 10 and the auxiliary guide body 12 move downward similarly, which allows the complete roundness of the cylindrical portion 2a of the yoke to be further ensured.
- the supporting cylindrical portion 14b of the rotational guide body 14 is to be rotated by a predetermined angle (30 degrees) to allow the portion adjacent to the first projection 2e to form the second projection 2e to face the punch 11 provided in the inner guide body 10, where because the positioning device 18 is provided between the rotational guide body 14 and the inner guide body 10, the rotation from the forming set state (forming state for the first projection 2e) in the direction indicated by the arrow shown in Fig.
- the movable pedestal 19 is to move downward again as mentioned above, while the rotational guide body 14 and the yoke 2 are set facing the position to form the second projection 2e, to allow the (punching) pressurization by the outer guide body 20, so that the second projection 2e is formed on the cylindrical portion 2a of the yoke.
- the third to ninth projections 2e are to be formed by rotating the rotational guide body 14 to be positioned sequentially by the positioning device 18 to allow the pressurization by the outer guide body 20.
- the auxiliary guide body 12 connected outside the cylindrical portion of the yoke 2, whereby the punching force to be received by the inner guide body 10 when the outer guide body 20 pressurizes the cylindrical portion 2a of the yoke is to be received by the auxiliary guide body 12 disposed outside the cylindrical portion of the yoke 2, which makes it possible to receive a larger punching force relative to the case where the punching force of the outer guide body 20 is received inside the cylindrical portion 2a of the yoke, and therefore to form the projections 2e in a single punching formation, resulting in an improvement in operability in the forming operation.
- the projections 2e are formed to be received by the punch receiving groove 20b formed on the abutting surface 20a of the outer guide body 20, and in the vicinity of the projections 2e, the cylindrical portion 2a of the yoke is guided by the inner and outer guide bodies 10, 20, the cylindrical portion 2a of the yoke cannot be deformed through a punching formation, which allows the projections 2e to be formed without damaging the complete roundness of the yoke 2.
- auxiliary guide body 12 is adapted to be pressurized by the outer auxiliary guide body 21 provided integrally on the outer guide body 20 to move in the same way as the inner guide body 10, both the inner guide body 10 and the auxiliary guide body 12 move downward similarly, whereby there can be no difference in the amount of downward movement between the front and rear end portions of the inner guide body 10, which allows the complete roundness of the yoke 2 to be further ensured.
- the punch 11 is fitted integrally to the fixed guide body 9 fixed outside the cylindrical portion of the yoke 2, the punching force in a punching formation can be set large, which allows the projections 2e to be formed on the yoke 2 further easily and workably.
- the rotational guide body 14 relatively rotatably, and the yoke 2 is to be incorporated thereinto while positioned rotationally against the rotational guide body 14 to perform punching operation while rotating the yoke 2 together with the rotational guide body 14, which makes it easy to sequentially form a plurality of projections 2e on the cylindrical portion 2a of the yoke, resulting in an improvement in workability in the forming operation.
- the positioning device 18 is provided between the inner guide body 10 and the rotational guide body 14, which makes it easy to set the rotational guide body 14 and the yoke 2 to a preset position to form the projections 2e, resulting in a further improvement in workability.
- the positioning device 18 is also interlocked with the detection sensor 18c, and thus the outer guide body 20 can perform no pressurizing operation until being set to the positioned state, whereby the projections 2e can be formed more accurately and reliably.
- an apparatus and a method for forming triggering projections on a flywheel according to the present invention are useful for a triggering projection forming apparatus and a method for forming triggering projections on a flywheel which detects the rotational state, and especially useful because formations are realized without damaging to the complete roundness of the cylindrical portion of a yoke.
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Abstract
To provide a forming apparatus adapted to punch the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel to form a plurality of triggering projections without damaging the complete roundness of the yoke and with high workability. A triggering projection forming apparatus 7 is arranged in such a manner as to comprise: an inner guide body 10 to be butted against the inner periphery of the cylindrical portion 2a of a yoke; a projection forming punch 11 provided in the inner guide body 10 retractably in the punching direction; and an outer guide body 20 adapted to butt an abutting surface 20a with a receiving groove 20b for receiving the punch 11 formed therein against the outer periphery of the cylindrical portion 2a of the yoke to be pressurized, while the inner guide body 10 is connected with an auxiliary guide body 12 extending outside the cylindrical portion of the yoke 2, the auxiliary guide body 12 provided outside the cylindrical portion of the yoke 2 being adapted to receive the punching force of the outer guide body 20.
Description
- The present invention relates to a technical field of an apparatus and method for forming a triggering projection in a flywheel to be fitted on a rotation axis to detect the rotational state thereof.
- Among flywheels of this kind, there has generally been known a type in which a permanent magnet is provided on the inner periphery of the cylindrical portion of a yoke that is formed in a bottomed cylindrical shape and a plurality of projections for receiving trigger signals (hereinafter referred to as "triggering projections") are formed circumferentially in a projecting manner outward from the outer peripheral surface of the cylindrical portion, such a flywheel being adapted to be fitted integrally over the rotation axis of an actuator, while a sensor being provided facing the cylindrical portion of the yoke to detect a magnetized projection (trigger) using the sensor and thereby the rotational state of the rotation axis (the driving state of the actuator) is detected. As a method for forming a triggering projection on the cylindrical portion of a yoke that constitutes such a flywheel, there have been proposed various methods such as: separately providing a projection to be fixed to the cylindrical portion of the yoke using integrating means such as adhesive; and punching the cylindrical portion to form a projection. Meanwhile, projections are to be formed on the outer peripheral surface of a yoke to be fitted over a rotation axis, and therefore are required to be formed without damaging the complete roundness of the yoke. In particular, when punching the cylindrical portion of the yoke to form projections, it is often the case that the cylindrical portion is deformed, and therefore means for preventing the complete roundness from being damaged is required.
- In order to improve measures, there has been proposed a simple and inexpensive method for forming a projection, the method comprising: a first punching step of forming an acute-angled projection on the cylindrical portion of a yoke; and a second punching step of forming the acute-angled projection into a circular shape (For example,
Japanese Published Unexamined Patent Application No. S57-148568 - Meanwhile, in accordance with the above-described conventional method, because the punching operation using a punch is adapted to be performed inside the cylinder of the yoke, it is impossible to ensure a large punching force, and it is therefore arranged that a triggering projection (pole) is formed through the first punching step in which an acute-angled projection is preliminarily formed to project significantly outward and the second punching step in which the projection is retreated inward to be a circular shape, which thus requires two punching steps, resulting in a problem in that the number of working processes is increased. In addition, because there is no member for guiding the end leading the punching in the first punching step where a large acute-angled projection is formed, the complete roundness of the cylindrical portion of the yoke can be damaged. Therefore even if tried by providing guiding on either side thereof in the second punching step, it is difficult to sufficiently compensate for the damaged roundness due to the problem of springback, etc. The problems raised here are to be solved by the present invention.
- The present invention has been made in consideration of the above-described circumstances and to solve the problems. The first aspect of the invention provides an apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel, said triggering projections being projected toward the outer diameter side of the yoke by punching, the forming apparatus comprising: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form a projection by the punch, wherein the inner guide body is connected with an auxiliary guide body extending outside the cylindrical portion of the yoke, the auxiliary guide body provided outside the cylindrical portion of the yoke being adapted to receive the punching force of the projection by the outer guide body.
- Then, with the arrangement above, the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- The second aspect of the invention provides the forming apparatus according to the first aspect of the invention, wherein the auxiliary guide body is adapted to receive the punching force of the outer guide body via a spring, whereby the punching force of the outer guide body can be set larger.
- The third aspect of the invention provides the forming apparatus according to the first or second aspect of the invention, wherein the auxiliary guide body is adapted to be pressurized by an outer auxiliary guide body provided integrally on the outer guide body, whereby the complete roundness of the yoke can be further ensured.
- The fourth aspect of the invention provides the forming apparatus according to any of the first to third aspects of the invention, wherein the punch is provided integrally on a fixed guide body to be fixed outside the cylindrical portion of the yoke, whereby the punching force can be set much larger.
- The fifth aspect of the invention provides the forming apparatus according to any of the first to fourth aspects of the invention, wherein a rotational guide body is provided relatively rotatably in the inner guide body, the yoke being adapted to be incorporated into the inner guide body via the rotational guide body, whereby the yoke can be rotated easily relative to the inner guide body.
- The sixth aspect of the invention provides the forming apparatus according to the fifth aspect of the invention, wherein between the rotational guide body and the inner guide body is provided positioning means for positioning the rotational guide body against the inner guide body, whereby the yoke can be rotated while positioned against a projection.
- The seventh aspect of the invention provides the forming apparatus according to the sixth aspect of the invention, wherein the positioning means is adapted to be interlocked with the pressurizing operation of the outer guide body, whereby it is possible to form a projection accurately and reliably.
- The eighth aspect of the invention provides a method for forming triggering projections on a flywheel, wherein an apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel with the triggering projections being projected toward the outer diameter side of the yoke by punching, comprises: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form the projection by the punch; and an auxiliary guide body being connected to the inner guide body and extending outside the cylindrical portion of the yoke, said method comprising such steps that after setting the yoke on the inner guide body with no punch projecting, the outer guide body is pressed against the outer periphery of the yoke to form the projection, the auxiliary guide body provided outside the cylindrical portion of the yoke being adapted to receive the punching force of the outer guide body.
- Then, with the arrangement above, the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- In accordance with the first aspect of the invention, the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
- In accordance with the second aspect of the invention, the punching force of the outer guide body can be set larger.
- In accordance with the third aspect of the invention, the complete roundness of the yoke can be further ensured.
- In accordance with the fourth aspect of the invention, the punching force can be set much larger.
- In accordance with the fifth aspect of the invention, the yoke can be rotated easily relative to the inner guide body.
- In accordance with the sixth aspect of the invention, the yoke can be rotated while positioned against a projection.
- In accordance with the seventh aspect of the invention, it is possible to form a projection accurately and reliably.
- In accordance with the eighth aspect of the invention, the punching force of the outer guide body can be set large enough to form a projection in a single pressurizing operation while ensuring the complete roundness of the yoke.
-
- [Fig. 1] Fig. 1 (A) and Fig. 1 (B) are a front elevational view and a cross-sectional view along X-X of a flywheel, respectively.
- [Fig. 2] Fig. 2 (A) and Fig. 2 (B) are a front elevational view and a cross-sectional view along X-X of a yoke, respectively.
- [Fig. 3] Fig. 3 is a side cross-sectional view of a triggering projection forming apparatus.
- [Fig. 4] Fig. 4 is a plan view of the triggering projection forming apparatus.
- [Fig. 5] Fig. 5 is a front elevational view of the triggering projection forming apparatus.
- [Fig. 6] Fig. 6 is a bottom plan view of a movable side member that constitutes the triggering projection forming apparatus.
- [Fig. 7] Fig. 7 is an enlarged side cross-sectional view of a substantial part illustrating the punching operation of a punch.
- Next will be described an embodiment of the present invention with reference to Figs. 1 to 7.
- In the figures, the
numeral 1 indicates a flywheel adapted to be fitted over the crankshaft of the engine of a motorcycle, theflywheel 1 comprising ayoke 2 formed of ferromagnetic material (e.g. iron) in a bottomed cylindrical shape, and on the inner peripheral surface of thecylindrical portion 2a of theyoke 2 is provided amagnet holder 3 via integrating means such as adhesive, themagnet holder 3 and aholder pin 3a disposed on the opening side of thecylindrical portion 2a supporting multiple pairs ofpermanent magnets 4. - Further, in the
cylindrical bottom portion 2b of theyoke 2 that constitutes theflywheel 1 is opened a throughhole 2c concentrically with thecylindrical portion 2a, and on the outside surface of thecylindrical bottom portion 2b is provided aboss plate 5 integrally. Theboss plate 5 comprises a disk-shaped plate portion 5a and a bosscylindrical portion 5b positioned around the central axis of theplate portion 5a to be fitted and joined to the throughhole 2c of the yoke. In theplate portion 5a and thecylindrical bottom portion 2b of the yoke are opened a plurality of caulking throughholes yoke 2 and theboss plate 5 are to be caulked and fixed integrally by inserting a caulkingpin 6 into each of the caulking throughholes cylindrical portion 5b projects from the throughhole 2c to inside thecylindrical portion 2a of the yoke (toward thecylindrical bottom portion 2b) when fixed integrally to theyoke 2, thecylindrical hole 5d being formed in such an inclined manner that the hole diameter decreases the closer to the opening side of thecylindrical portion 2a of the yoke, and further in thecylindrical hole 5d being carved akey groove 5e. The thus arrangedflywheel 1 is adapted to be connected interlockingly with a crankshaft so as not to be rotated by allowing the bosscylindrical portion 5b to be fitted over the crankshaft via thekey groove 5e. - On the outer peripheral surface of the
cylindrical portion 2a of the yoke are then formed circumferentially a plurality of axially long triggeringprojections 2e in a projecting manner outward therefrom. Theprojections 2e are formed circumferentially at a predetermined angular interval (30 degrees in the present embodiment) within an angular range of 240 degrees not all around thecylindrical portion 2a by an appropriate number (9 pieces in the present embodiment). Then, theflywheel 1 is formed by incorporating required members such aspermanent magnets 4 into theyoke 2 with theprojections 2e formed preliminarily on the outer periphery thereof by punching thecylindrical portion 2a. A triggering projection forming apparatus 7 embodying the present invention is employed as means for thus forming triggeringprojections 2e on thecylindrical portion 2a of the yoke. - On a
fixed pedestal 8 that constitutes a fixed side in the forming apparatus 7 are provided afixed guide body 9 and aninner guide body 10 to be butted from within the yoke to the inner peripheral surface of thecylindrical portion 2a of the yoke according to the present invention. - That is, the square
rear end portion 9a (the left portion in the side cross-sectional view of Fig. 3 and leading end portion in the direction of incorporation of the yoke 2) of thefixed guide body 9 is fixed integrally to thefixed pedestal 8 via a vertically orientedfixing bolt 8a. Meanwhile, thefront end portion 9b of thefixed guide body 9 is formed while keeping a predetermined clearance against the upper surface of the fixedpedestal 8, where theyoke 2 is adapted to be fitted over thefront end portion 9b by incorporating the lower part of thecylindrical portion 2a of theyoke 2 into the clearance. Then, arecessed portion 9c for integrally fixing apunch 11 according to the present invention thereto is provided in thefront end portion 9b in a recessed manner rearward, and thepunch 11 comprises: arectangular base portion 11a provided in the lower end portion thereof; and abody portion 11b projecting upward from the upper end surface of thebase portion 11a and adapted to form aprojection 2e on theyoke 2, therectangular base portion 11a being fixed to the recessedportion 9c of the fixed guide body via afixing bolt 9d. Then, thebody portion 11b is disposed in such a manner, when thepunch 11 is in a fixed state, as to project upward from the upper surface of thefront end portion 9b (fixed guide body 9) and that the front end surface of thepunch 11 is flush with the front end surface of thefixed guide body 9. - Meanwhile, the
inner guide body 10 comprises aguide body portion 10b having a circular outerperipheral surface 10a with the same curvature as that of the inner peripheral surface of thecylindrical portion 2a of the yoke so as to be butted against the inner peripheral surface except for the lower part of thecylindrical portion 2a of the yoke, and with a longitudinal length greater than the cylindrical length of theyoke 2. Further, theinner guide body 10 is provided integrally with adisk portion 10d positioned in the front end of theguide body portion 10b and comprising aboss portion 10c that is provided concentrically with theyoke 2 to be fitted thereon. In theguide body portion 10b are also formed a rectangular recessedportion 10e opened downward and a throughhole 10f through which thebody portion 11b of the punch moves vertically. It is then arranged as will be described hereinafter that when theinner guide body 10 is incorporated so that thebody portion 11b of the punch is inserted into the throughhole 10f, therecessed portion 10e is to be fitted freely over thefront end portion 9b of thefixed guide body 9 and the rear surface of thedisk portion 10d is to be disposed close to and facing the front surface of thepunch 11, so that theinner guide body 10 and thefixed guide body 9 can move vertically relatively to each other. - Further, the rear end surface of the
guide body portion 10b of theinner guide body 10 is connected integrally with anauxiliary guide body 12 according to the present invention by means such as bolting. Theauxiliary guide body 12 is formed as an elongated member comprising supportingpiece portions 12a extending leftward and rightward from theyoke 2, and is provided with the upper surface which exists in the same position as the upper tangent of thecircular plane 10a of the inner guide body as shown in the front elevational view of the forming apparatus 7 in Fig. 5. In the lower surface of theauxiliary guide body 12 is also formed arecessed portion 12b having the same shape as that of therecessed portion 10e formed in theguide body portion 10b, therecessed portion 12b being adapted to fit therear end portion 9a of thefixed guide body 9 thereinto freely. Then, a pair ofguide bolts 12c run through each of the left and right supportingpiece portions 12a of theauxiliary guide body 12 in such a manner as to be fitted freely thereinto and not to come out thereof, where the base end portion of theguide bolts 12c is fixed to the fixedpedestal 8. Further, on eachguide bolt 12c is fitted a verticallylong coil spring 13 between the lower surface of theauxiliary guide body 12 and the upper surface of the fixedpedestal 8, whereby theauxiliary guide body 12 is supported on the fixedpedestal 8 together with theinner guide body 10 connected integrally with theauxiliary guide body 12 while being supported by the coil springs 13. - Here, the coil springs 13 are adjusted in such a manner that the triggering projection forming apparatus 7 is fixed integrally in the fixed
guide body 9 and that the upper end of thebody portion 11b of the punch that runs through theinner guide body 10 does not project from (e.g. is brought into approximately the same plane as, namely is flush with) the upper end surface of theauxiliary guide body 12 and theinner guide body 10 when the triggering projection forming apparatus 7 is in a non-operational state where a movable side member to be described hereinafter is not operated (indicated by the virtual line in Fig. 7). - It is further arranged that in the non-operational state, a vertical clearance S is formed between the recessed
portions inner guide body 10 and theauxiliary guide body 12 and the upper end surface of the fixedguide body 9 so that theinner guide body 10 and theauxiliary guide body 12 are allowed to move downward toward the fixedguide body 9 by the clearance S as a punching margin, and that the clearance S has a vertical dimension larger than the amount of projection of theprojections 2e. - In front of the
inner guide body 10 is also provided arotational guide body 14. Therotational guide body 14 comprises: a disk-shapeddisk portion 14a having a diameter smaller than the outer diameter of thedisk portion 10d of the inner guide body; and a supportingcylindrical portion 14b projecting forward along the central axis of thedisk portion 14a. Then, the rear end portion of the supportingcylindrical portion 14b is adapted to fit theboss portion 10c of the inner guide body thereinto relatively rotatably so that thedisk portion 10d of the inner guide body is incorporated concentrically into therotational guide body 14. - It is noted that the
rotational guide body 14 and theinner guide body 10 are adapted to be connected relatively rotatably with each other by threadably fitting the leading end of afastening bolt 15, which is inserted from in front of and runs relatively rotatably through the supportingcylindrical portion 14b, into theboss portion 10c. In this case, thehead portion 15a of thefastening bolt 15 is adapted to be butted against a steppedportion 14c formed inside the supportingcylindrical portion 14b to prevent therotational guide body 14 from coming out forward of theinner guide body 10. - In the
disk portion 14a of therotational guide body 14 are then supported penetratingly positioning pins 16 in a projecting manner forward therefrom facing two preset caulking throughholes 2d among those opened in thecylindrical bottom portion 2b of the yoke. Further, on the outer periphery of thedisk portion 14a of the rotational guide body are formed circumferentially four positioning recessedportions 14d notched inward. Also, in the outer diameter portion of thedisk portion 14a of the rotational guide body are formed engaging recessedholes 14e at the same angular interval (30 degrees) and by the same number (nine pieces) as that of theprojections 2e, the engaging recessedholes 14e being formed by recessing the rear end surface of thedisk portion 14a forward into a spherical shape. It is noted that the nine engaging recessedholes 14e are formed in such a manner that the hole centers thereof are positioned at the same radius from the central axis of the supportingcylindrical portion 14b. - It is noted that the numeral 17 indicates a locking pin to be installed in the
inner guide body 10 in a longitudinally oriented manner, the leading end of the lockingpin 17 being arranged retractable forward from thedisk portion 10d of the inner guide body, and adapted to be disengageably engaged with a spherical engaging recessedportion 14f formed in a preset position in the outer diameter portion of therotational guide body 14. Thus, when incorporating therotational guide body 14 into theinner guide body 10, engaging the lockingpin 17 with the engaging recessedportion 14f allows therotational guide body 14 to be positioned rotationally (circumferentially) against theinner guide body 10. - Also as will be described hereinafter, between the
inner guide body 10 and therotational guide body 14 is provided a positioning device (corresponding to the positioning means of the present invention) 18 for positioning and engaging therotational guide body 14 against theinner guide body 10 facing theprojections 2e. Thepositioning device 18 comprises: apin shaft 18a provided longitudinally movably in a longitudinally long hole that allows theinner guide body 10 and theauxiliary guide body 12 to communicate with each other with the leading end thereof adapted to be engaged disengageably with one of the engaging recessedholes 14e formed in thedisk portion 14a of the rotational guide body; an urgingspring 18b for urging thepin shaft 18a toward therotational guide body 14; and adetection sensor 18c adapted to output a detection signal when thepin shaft 18a is engaged with one of the engaging recessedholes 14e based on the urging force of the urgingspring 18b. - Then, when incorporating the
yoke 2 into theinner guide body 10 to be in a preset forming set state, theyoke 2 is to be incorporated by inserting the positioning pins 16 projecting from therotational guide body 14 into the two preset caulking throughholes 2d, where in the outer diameter portion on thecylindrical bottom portion 2b of the yoke are formed circumferentially fourpositioning pieces 2f projecting cylindrically inward, whereby theyoke 2 is to be incorporated integrally into the rotational guide body 14 (inner guide body 10) while positioned rotationally so as not to be rotated by allowing thepositioning pieces 2f to be fitted freely into the positioning recessedportions 14d formed in the outer peripheral portion of thedisk portion 14a of the rotational guide body as well as the positioning pins 16 to be incorporated penetratingly into the caulking throughholes 2d. - It is noted that the
yoke 2 is positioned concentrically with therotational guide body 14 in the forming set (incorporated) state above, and that thus incorporating theyoke 2 allows the inner peripheral surface of thecylindrical portion 2a of the yoke to be brought into contact with, at least, thecircular plane 10a of the inner guide body as indicated by the virtual line in Fig. 7. Further, in the forming set state above, thepin shaft 18a of thepositioning device 18 is adapted to be engaged with one engaging recessedhole 14e positioned in one rotational end portion (leading the rotation of the rotational guide body 14) among the nineholes 14e formed in the rotational guide body 14 (refer to Fig. 5). Also, in the forming set state above, theauxiliary guide body 12 arranged in the rear end portion of theinner guide body 10 is disposed outside the cylindrical portion of theyoke 2. - Meanwhile, the upper
movable pedestal 19 that constitutes the triggering projection forming apparatus 7 as a movable side member (die) is interlocked with operating means not shown in the figures vertically (in the punching direction for theprojections 2e) movably. To the lower end surface of themovable pedestal 19 are fixed integrally anouter guide body 20 positioned forward facing theinner guide body 10 to be butted against the outer peripheral surface of thecylindrical portion 2a of the yoke and an outerauxiliary guide body 21 positioned rearward to be butted against the upper surface of theauxiliary guide body 12. On theouter guide body 20 is formed anabutting surface 20a having the same curvature as the outer diameter of thecylindrical portion 2a of the yoke, the abuttingsurface 20a being adapted to have a circumferential length not to interfere with theprojections 2e to be formed adjacently to thecylindrical portion 2a of the yoke. In theabutting surface 20a is further provided apunch receiving groove 20b facing theprojections 2e in a recessed manner. - Meanwhile, the outer
auxiliary guide body 21 comprises a flatabutting surface 21a to be butted against the flat upper surface of theauxiliary guide body 12, the abutting surface being adapted to move vertically integrally with theouter guide body 20 based on the vertical movement of themovable pedestal 19 and to pressurize theauxiliary guide body 12 when theouter guide body 20 pressurizes (applies punching force to) the outer peripheral surface of thecylindrical portion 2a of the yoke. - It is noted that the
movable pedestal 19 is adapted to move downward (theouter guide body 20 is adapted to apply punching force) based on the input of a detection signal from thedetection sensor 18c that constitutes thepositioning device 18, whereby theouter guide body 20 performs no pressurizing operation with no detection signal input, which allows theprojections 2e to be formed accurately and reliably. - Then, when the
yoke 2 is incorporated into theinner guide body 10 in a preset forming set state, thepin shaft 18a of thepositioning device 18 is engaged with one engaging recessedhole 14e positioned in one rotational end portion as mentioned above, where the downward movement of themovable pedestal 19 allows theouter guide body 20 to pressurize the outer peripheral surface of thecylindrical portion 2a of the yoke to apply punching force to theinner guide body 10, whereby theinner guide body 10 is to move downward, and thepunch 11, which does not project from thecircular plane 10a of theinner guide body 10 in the forming set state, is to project from thecircular plane 10a of the inner guide body, and thus thebody portion 11b of the punch is to press up the inner peripheral surface of thecylindrical portion 2a of the yoke to form thefirst projection 2e at thepunch receiving groove 20b of the outer guide body 20 (refer to the solid lines in Fig. 3, Fig. 4, Fig. 5, and Fig. 7). - In the case above, the
outer guide body 20 is to pressurize thecylindrical portion 2a of the yoke to move theinner guide body 10 downward and thereby to form theprojection 2e, where the punching force acting on theinner guide body 10 is to be received by the coil springs 13 against the urging force through theauxiliary guide body 12 positioned outside the cylindrical portion of theyoke 2. Thus, the forming apparatus 7 is arranged in such a manner that the punching force of theouter guide body 20 can be received by the coil springs 13 that are positioned outside the cylindrical portion of theyoke 2 and supported on the fixedpedestal 8, whereby theyoke 2 cannot be interfered with even if the punching force of theouter guide body 20 may be increased, which allows theprojections 2e to be formed with a large punching force. - Further, in the case above, the
outer guide body 20 is adapted to move downward together with the outerauxiliary guide body 21 positioned rearward, where theouter guide body 20 is to pressurize thecylindrical portion 2a of the yoke and the outerauxiliary guide body 21 is to pressurize theauxiliary guide body 12. Thus, with the downward movement of theinner guide body 10 when receiving punching force for forming theprojections 2e, theauxiliary guide body 12 is also pressurized by the outerauxiliary guide body 21 to move downward, resulting in that both theinner guide body 10 and theauxiliary guide body 12 move downward similarly, which allows the complete roundness of thecylindrical portion 2a of the yoke to be further ensured. - After the
first projection 2e is thus formed on thecylindrical portion 2a of the yoke, the supportingcylindrical portion 14b of therotational guide body 14 is to be rotated by a predetermined angle (30 degrees) to allow the portion adjacent to thefirst projection 2e to form thesecond projection 2e to face thepunch 11 provided in theinner guide body 10, where because thepositioning device 18 is provided between therotational guide body 14 and theinner guide body 10, the rotation from the forming set state (forming state for thefirst projection 2e) in the direction indicated by the arrow shown in Fig. 5 allows thepin shaft 18a embedded in one engaging recessedhole 14e formed in one circumferential end portion to pop out of the engaging recessedhole 14e automatically, and then to face the engaging recessedhole 14e positioned second from the circumferential end portion to embed into and engage with the engaging recessedhole 14e automatically. It is thus arranged that theyoke 2 is rotated by 30 degrees from the forming set state, and therotational guide body 14 and theyoke 2 are positioned at the position to form thesecond projection 2e. Then, themovable pedestal 19 is to move downward again as mentioned above, while therotational guide body 14 and theyoke 2 are set facing the position to form thesecond projection 2e, to allow the (punching) pressurization by theouter guide body 20, so that thesecond projection 2e is formed on thecylindrical portion 2a of the yoke. - Then, the third to
ninth projections 2e are to be formed by rotating therotational guide body 14 to be positioned sequentially by thepositioning device 18 to allow the pressurization by theouter guide body 20. - In the thus arranged present embodiment, because when forming the
projections 2e on the outer periphery of thecylindrical portion 2a of theyoke 2 that constitutes theflywheel 1 the inner andouter guide bodies cylindrical portion 2a of the yoke, the complete roundness of theyoke 2 can be ensured. Also, in this case, in theinner guide body 10 to be butted against the inner periphery of thecylindrical portion 2a of the yoke is provided theauxiliary guide body 12 connected outside the cylindrical portion of theyoke 2, whereby the punching force to be received by theinner guide body 10 when theouter guide body 20 pressurizes thecylindrical portion 2a of the yoke is to be received by theauxiliary guide body 12 disposed outside the cylindrical portion of theyoke 2, which makes it possible to receive a larger punching force relative to the case where the punching force of theouter guide body 20 is received inside thecylindrical portion 2a of the yoke, and therefore to form theprojections 2e in a single punching formation, resulting in an improvement in operability in the forming operation. - Further, in this case, because the
projections 2e are formed to be received by thepunch receiving groove 20b formed on theabutting surface 20a of theouter guide body 20, and in the vicinity of theprojections 2e, thecylindrical portion 2a of the yoke is guided by the inner andouter guide bodies cylindrical portion 2a of the yoke cannot be deformed through a punching formation, which allows theprojections 2e to be formed without damaging the complete roundness of theyoke 2. - In addition, with the arrangement embodying the present invention, because the
auxiliary guide body 12 is adapted to be pressurized by the outerauxiliary guide body 21 provided integrally on theouter guide body 20 to move in the same way as theinner guide body 10, both theinner guide body 10 and theauxiliary guide body 12 move downward similarly, whereby there can be no difference in the amount of downward movement between the front and rear end portions of theinner guide body 10, which allows the complete roundness of theyoke 2 to be further ensured. - Also, because the
punch 11 is fitted integrally to the fixedguide body 9 fixed outside the cylindrical portion of theyoke 2, the punching force in a punching formation can be set large, which allows theprojections 2e to be formed on theyoke 2 further easily and workably. - Furthermore, in the
inner guide body 10 is provided therotational guide body 14 relatively rotatably, and theyoke 2 is to be incorporated thereinto while positioned rotationally against therotational guide body 14 to perform punching operation while rotating theyoke 2 together with therotational guide body 14, which makes it easy to sequentially form a plurality ofprojections 2e on thecylindrical portion 2a of the yoke, resulting in an improvement in workability in the forming operation. - Further, the
positioning device 18 is provided between theinner guide body 10 and therotational guide body 14, which makes it easy to set therotational guide body 14 and theyoke 2 to a preset position to form theprojections 2e, resulting in a further improvement in workability. - The
positioning device 18 is also interlocked with thedetection sensor 18c, and thus theouter guide body 20 can perform no pressurizing operation until being set to the positioned state, whereby theprojections 2e can be formed more accurately and reliably. - It will be appreciated here that the present invention is not restricted to the above-described embodiment, and it is also possible to arrange that the rotational guide body is rotated mechanically, though rotated manually in the above-described embodiment.
- As described above, an apparatus and a method for forming triggering projections on a flywheel according to the present invention are useful for a triggering projection forming apparatus and a method for forming triggering projections on a flywheel which detects the rotational state, and especially useful because formations are realized without damaging to the complete roundness of the cylindrical portion of a yoke.
Claims (8)
- An apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel, said triggering projections being projected toward the outer diameter side of the yoke by punching, the forming apparatus comprising: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form a projection by the punch, wherein the inner guide body is connected with an auxiliary guide body extending outside the cylindrical portion of the yoke, the auxiliary guide body provided outside the cylindrical portion of the yoke being adapted to receive the punching force of the projection by the outer guide body.
- The apparatus for forming triggering projections on a flywheel according to claim 1, wherein the auxiliary guide body is adapted to receive the punching force by the outer guide body via a spring.
- The apparatus for forming triggering projections on a flywheel according to claim 1 or 2, wherein the auxiliary guide body is adapted to be pressurized by an outer auxiliary guide body provided integrally on the outer guide body.
- The apparatus for forming triggering projections on a flywheel according to any of claims 1 to 3, wherein the punch is provided integrally on a fixed guide body fixed outside the cylindrical portion of the yoke.
- The apparatus for forming triggering projections on a flywheel according to any of claims 1 to 4, wherein a rotational guide body is provided relatively rotatably in the inner guide body, the yoke being adapted to be incorporated into the inner guide body via the rotational guide body.
- The apparatus for forming triggering projections on a flywheel according to claim 5, wherein between the rotational guide body and the inner guide body is provided positioning means for positioning the rotational guide body with respect to the inner guide body.
- The apparatus for forming triggering projections on a flywheel according to claim 6, wherein the positioning means is adapted to be interlocked with the pressurizing operation of the outer guide body.
- A method for forming triggering projections on a flywheel, wherein an apparatus for forming a plurality of triggering projections, which serve for receiving trigger signals, circumferentially on the outer periphery of the cylindrical portion of a bottomed cylindrical yoke that constitutes a flywheel with the triggering projections being projected toward the outer diameter side of the yoke by punching, comprises: an inner guide body to be butted against the inner periphery of the cylindrical portion of the yoke; a projection forming punch provided in the inner guide body retractably in the punching direction; and an outer guide body with a receiving groove for receiving the punch formed therein, the outer guide body being adapted to pressurize the cylindrical portion of the yoke via an abutting surface to be butted against the outer periphery of the cylindrical portion of the yoke to form the projection by the punch; and an auxiliary guide body being connected to the inner guide body and extending outside the cylindrical portion of the yoke, said method comprising such steps that after setting the yoke on the inner guide body with no punch projecting, the outer guide body is pressed against the outer periphery of the yoke to form the projection, the auxiliary guide body provided outside the cylindrical portion of the yoke being adapted to receive the punching force of the outer guide body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004227039 | 2004-08-03 | ||
PCT/JP2005/014252 WO2006013907A1 (en) | 2004-08-03 | 2005-07-28 | Apparatus for forming triggering projections in flywheel, and method of forming projections for triggering |
Publications (1)
Publication Number | Publication Date |
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EP1775040A1 true EP1775040A1 (en) | 2007-04-18 |
Family
ID=35787188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05768817A Withdrawn EP1775040A1 (en) | 2004-08-03 | 2005-07-28 | Apparatus for forming triggering projections in flywheel, and method of forming projections for triggering |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1775040A1 (en) |
JP (1) | JP4772682B2 (en) |
CN (1) | CN100488656C (en) |
BR (1) | BRPI0512015B1 (en) |
WO (1) | WO2006013907A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2023146203A (en) * | 2022-03-29 | 2023-10-12 | 株式会社ミツバ | Rotary electric machine and manufacturing method thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1133660A (en) * | 1997-07-23 | 1999-02-09 | Mazda Motor Corp | Manufacture of toothed part |
JP3758133B2 (en) * | 2000-10-10 | 2006-03-22 | トヨタ自動車株式会社 | Drawing method |
JP2002315277A (en) * | 2001-04-16 | 2002-10-25 | Honda Motor Co Ltd | Method of manufacturing, and device for manufacturing rotor for rotating electric machine |
-
2005
- 2005-07-28 BR BRPI0512015-2A patent/BRPI0512015B1/en not_active IP Right Cessation
- 2005-07-28 EP EP05768817A patent/EP1775040A1/en not_active Withdrawn
- 2005-07-28 CN CNB2005800214654A patent/CN100488656C/en not_active Expired - Fee Related
- 2005-07-28 WO PCT/JP2005/014252 patent/WO2006013907A1/en active Application Filing
- 2005-07-28 JP JP2006531527A patent/JP4772682B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO2006013907A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP4772682B2 (en) | 2011-09-14 |
WO2006013907A1 (en) | 2006-02-09 |
CN1976769A (en) | 2007-06-06 |
BRPI0512015B1 (en) | 2018-07-10 |
BRPI0512015A (en) | 2008-02-06 |
CN100488656C (en) | 2009-05-20 |
JPWO2006013907A1 (en) | 2008-05-01 |
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