JP2007215333A - Rotator and device for forming protrusion for detecting rotational signal in rotator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a protrusion protruding to the outer diameter side and detecting a rotational signal on the outer circumference by beating in a yoke where a boss is formed on the bottom of a bottomed tube while directing toward the inside of the tube. <P>SOLUTION: The device 5 for forming a protrusion 2f protruding to the outer diameter side on the outer circumference of the tubular section 2a of a yoke 2 where a boss 2d is formed comprises a fixed guide body 7 fitted idly to the proximal end side of the tubular section 2a in the beating direction, an inside guide body 9 fitted idly to the tip side of the tubular section 2a in the beating direction and butted against the inner circumference of the tubular section, a punch 8 having a boss through hole 8c for avoiding interference with the boss portion 2d of the yoke 2 formed between a base end portion 8a secured to the fixed guide body 9 and a punch body 8d penetrating the inside guide body 8 movably in the beating direction and abutting against the inner circumference of the tubular section 2a to beat out a protrusion 2f, and an outside guide body 14 having a punch receiving trench 14b and abutting against the outer circumference on the tip side of the tubular section 2a in the beating direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of a rotating body that is attached to a rotating shaft and constitutes a flywheel or the like for detecting a rotating state, and a device for forming a protrusion for detecting a rotation signal in the rotating body.

  In general, when this kind of rotating body is a yoke constituting a flywheel, the yoke is formed in a bottomed cylindrical shape, a permanent magnet is provided on the inner peripheral surface of the cylindrical portion of the yoke, and the outer periphery of the cylindrical portion of the yoke A plurality of rotation signal detection protrusions for detecting the rotation state of the yoke are formed on the surface in a circumferential direction so as to protrude to the outer diameter side. As described above, in order to form the projection for detecting the rotation signal on the cylindrical portion of the yoke, a method of preparing the projection separately and attaching the projection to the yoke cylindrical portion using an integrated means such as welding or the like. Various proposals have been made, such as a method for molding the material. In this case, when the projection is formed, the yoke tube portion is often deformed, and a means for forming the projection without compromising the roundness of the yoke is required.

As one means of this improvement measure, a band-shaped (ring-shaped) ridge protruding to the outer diameter side is formed on the outer peripheral surface of the yoke, and a predetermined gap is formed in the circumferential direction by cutting the ridge. The thing which formed the existing protrusion is proposed.
JP 2003-88060 A

  However, when a ring-shaped protrusion is formed and the protrusion is formed by cutting the ring-shaped protrusion, a plurality of cutting processes are required, which not only complicates the manufacturing process but also makes the operation complicated. However, there is a problem that the material is wasted and the cost is increased. On the other hand, in the case where the protrusion is formed by stamping the cylindrical portion of the yoke, the protrusion can be formed by a single punching process, and the cost can be reduced. When the material of the rotating body is a metal material with high hardness, a large punching force is required to punch and mold the cylinder part. In order to do so, a sufficient space must be secured in the cylinder of the yoke. However, a boss that is integrally formed from the bottom surface of the yoke is formed in the cylinder of the yoke, and in the case where the protrusion is formed at the outer peripheral portion opposed to the boss in the radial direction, the boss is sufficiently formed in the cylinder of the yoke. There is a problem that it is difficult to ensure a sufficient space and it becomes difficult to punch and form the protrusion while ensuring the roundness, and there is a problem to be solved by the present invention.

The present invention was created with the object of solving these problems in view of the above circumstances, and the invention of claim 1 is a boss in which a drive shaft is fitted into the bottom of a low-end cylindrical body. A rotating body integrally formed toward the inner side of the cylinder, and the rotating body has a rotation signal detection protrusion formed by stamping from the inner side of the cylindrical part toward the outer diameter side on the outer periphery of the cylindrical part. This is a featured rotating body.
According to a second aspect of the present invention, a projection for detecting a rotation signal is formed on the outer periphery of a cylindrical portion of a rotating body in which a boss portion in which a drive shaft is fitted to a bottom portion of a low and low cylindrical body is integrally formed toward the inner side of the cylinder. A molding apparatus that is molded by punching from the inside of the part is fixedly fitted in a loosely fitting manner on the proximal end side of the tubular part in the projecting direction, and is loosely fitted on the distal end side of the tubular part in the projecting direction. Rotate between the inner guide body that is abutted against the circumference, the fixed part that is fixed to the fixed guide body, and the main body part that penetrates the inner guide body so as to be movable in the launch direction and is abutted against the inner periphery of the cylinder part and projecting the protrusion A punch having an interference avoidance portion that avoids interference with the boss portion of the body, and an outer guide that is formed with a punch receiving groove and is abutted against the outer periphery of the tube portion in the launch direction to provide a projecting force for the projection Rotating signal detection in a rotating body comprising a body A molding apparatus of the protrusion.
According to a third aspect of the present invention, the interference avoiding portion is constituted by a through hole that is loosely fitted to the rotating boss portion, and an inner diameter of the through hole is a boss portion corresponding to a punching stroke by a punch. The apparatus for forming a projection for detecting a rotation signal in a rotating body according to claim 2, wherein the apparatus is set to a size allowing relative movement.
According to a fourth aspect of the present invention, the inner guide body is integrally provided with an auxiliary guide body extending outside the cylinder of the yoke, and is configured to receive a punching force from the outer guide body via the auxiliary guide body. The apparatus for forming a projection for detecting a rotation signal in the rotating body according to claim 2.

According to the invention of claim 1, it is possible to provide a yoke with high roundness, to reduce the number of work steps, and to reduce the cost by eliminating waste of materials.
According to the second and third aspects of the invention, a highly circular yoke can be provided, and the number of work steps can be reduced, and the cost can be reduced by eliminating waste of materials.
According to the invention of claim 4, it is possible to reliably form the protrusion while further improving the roundness of the yoke.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, 1 is a flywheel used in a magnet type AC generator, and a yoke 2 constituting the flywheel 1 is formed of a ferromagnetic material (for example, iron) in a bottomed cylindrical shape, A magnet holder 3 is provided on an inner peripheral surface of the cylindrical portion 2a of the yoke 2 via an integration means such as an adhesive, and a holder pin disposed on the opening side of the magnet holder 3 and the yoke cylindrical portion 2a. A plurality of pairs of permanent magnets 4 are supported and fixed by the yoke 3a.

  Furthermore, a through-hole 2c is opened in the cylindrical bottom portion (corresponding to the bottom portion of the present invention) 2b of the yoke 2 constituting the flywheel 1 in a positional relationship that is concentric with the axial center of the cylindrical portion 2a. At the hole edge of the through hole 2c, a cylindrical boss portion 2d is integrally formed so as to project toward the inner side of the cylindrical portion 2a. The boss portion 2d protrudes from the yoke through hole 2c toward the opening end 2e side of the tube portion 2a, and the boss portion 2d protrudes outward from the yoke tube portion 2a beyond the opening end 2e. Is set. The flywheel 1 thus configured is configured to rotate integrally with the drive shaft by integrating (interlockingly connecting) a drive shaft (not shown) with the cylindrical portion of the boss portion 2d.

  Furthermore, a plurality of rotation signal detection (trigger) protrusions 2f projecting outward are formed on the outer peripheral surface of the yoke cylinder portion 2a in the circumferential direction. These protrusions 2f are formed at portions that are opposed to the boss portion 2d in the radial direction, and are formed by stamping in the radial direction with respect to the axial center of the cylindrical portion 2a. . Further, the protrusions 2f are formed with a predetermined angular interval (30 degrees in the present embodiment) in the circumferential direction, and the protrusions 2f do not extend over the entire circumference of the cylindrical portion 2a. In the embodiment, nine are formed in an angle range of 240 degrees. The flywheel 1 is set so as to be configured by incorporating necessary members such as the permanent magnet 4 on the inner peripheral surface of the yoke cylinder portion 2a in which the protrusions 2f are previously stamped and formed on the outer periphery of the cylinder portion 2a. As a means for forming the rotation signal detection projection 2f on the outer periphery of the yoke tube portion 2a, the rotation signal detection projection forming apparatus 5 in which the present invention is implemented is used.

The molding device 5 is configured to include a rectangular fixed base 6 on the fixed side. When FIG. 2 is a front view, the fixing guide 6 according to the present invention is disposed at an intermediate portion in the left-right direction of the fixed base 6. The body 7 is provided integrally. The fixed guide body 7 is fixed to the fixed base 6 via a plurality of fixing bolts 6a facing in the vertical direction. Further, a protrusion 7a protruding forward is formed at a front end portion (one of the right end portion in the side sectional view of FIG. 3 and the base end side portion in the yoke mounting direction) which is one end portion of the fixed guide body 7. It is integrally formed. The protrusion 7a has a lower surface 7b formed in an arcuate surface along the outer periphery of the yoke tube portion 2a. A predetermined gap S1 is formed between the lower surface 7b and the upper surface of the fixed base 6, and the gap S1 It is set so that a lower portion (base end portion in a launch direction described later) of the yoke tube portion 2a is incorporated. In the assembled state of the yoke 2, the projecting portion 7a is set so as to be fitted into the yoke tube portion 2a in a loose fit.
Further, the protrusion 7a is provided with a groove 7d on the upper surface 7c so as to be integrally fixed to the lower end of the punch 8 in which the present invention is implemented.
Here, the gap S1 formed between the fixed guide protrusion 7a and the fixed base 6 is the thickness of the yoke tube portion 2a and the launch stroke required when the protrusion 2f is formed on the tube portion 2a. The dimension is set to be longer than the length including S. Further, in the present embodiment, the right end portion of the fixed base 6, that is, the portion where the yoke 2 of the portion facing the fixed guide body protrusion 7 a forming portion is located, and the concave portion 6 b notched downward is formed. Thus, the yoke 2 is set so as to be easily incorporated into the molding device 5.

The punch 8 has a circular boss through-hole as an interference avoiding portion for avoiding interference with the yoke boss portion 2d above a rectangular base end portion (corresponding to a fixing portion of the present invention) 8a which is a lower portion. A ring-shaped portion 8c formed with 8b (corresponding to the through-hole of the present invention) is integrally formed, and is projected on the yoke 2 at the upper end portion located on the center line M in the left-right direction of the ring-shaped portion 8c. A punch main body (corresponding to a main body portion of the present invention) 8d for forming 2f is integrally formed protruding upward. The punch 8 is inserted into the groove portion 7d formed in the fixed guide body protrusion 7a, and the punch 8 is fastened by a fixing bolt 7e screwed from below the protrusion 7a, thereby fixing the fixed guide body 7a. It is fixed integrally with.
Here, the boss through-hole 8b of the ring-shaped part 8c is externally fitted to the boss part 2d formed on the yoke 2, and the boss through-hole of the yoke boss part 2d when the protrusion 2f is formed by stamping on the cylindrical part 2a. The inner diameter of the boss through-hole 8b is set to be larger than the dimension obtained by adding the punching stroke S to the outer diameter of the boss portion 2d at the portion facing the punch 8 so as to allow the movement within the hole 8b (movement corresponding to the punching stroke S). Long dimensions are set.

On the other hand, 9 is an inner guide body that abuts against the inner peripheral surface of the upper portion (launching direction front end portion) from the intermediate portion in the vertical direction of the yoke cylinder portion 2a. It has a circular center on the center line M, and is formed in a horseshoe shape having an arcuate outer peripheral surface 9a having the same curvature as the inner peripheral surface of the yoke tube portion 2a. The inner peripheral surface 9b is formed of the yoke boss portion 2d. It is formed in the circular arc surface which can be externally fitted. Further, a guide hole is formed in the front end portion of the inner guide body 9 for penetrating and guiding the punch 8 while being movable in the vertical direction. The guide hole includes the uppermost end portion of the inner guide body 9. The first guide hole 9c that faces the up-and-down direction established at the site and guides through the punch body 8d, and the semi-ring-shaped recess that is recessed from the first guide hole 9c with the inner peripheral surface 9b facing upward. And the second guide hole 9d that guides through the punch ring-shaped portion 8c. The guide holes 9c and 9d are sized to allow vertical movement corresponding to the punch stroke S. Is formed.
Further, on the inner peripheral surface 9b at the front end portion of the inner guide body 9, a ring-shaped recess 9e cut out in the outer diameter direction corresponding to the stepped cylindrical portion 2g formed in the yoke boss portion 2d is formed. . The front end surface 9f of the inner guide body 9 and the front end surface 7f of the fixed guide body protrusion 7a are set to be flush with each other.

Further, an auxiliary guide body 10 is integrally connected to the rear end surface of the inner guide body 9 via a plurality of fixing bolts 10a. The upper surface 10b of the auxiliary guide body 10 is connected to the inner guide body 9. It is set so as to be positioned lower than the upper surface, and is formed in a thick plate-like body formed with a pair of left and right wing portions 10c that extend greatly in the left-right direction and project long forward. A pair of front and rear guide bolts 11 are loosely fitted in the pair of left and right wing portions 10c having substantially the same left and right width and front and rear width as the fixed base 6, and the wing portion 10c. Is passed through without being pulled out from the guide bolt 11, and the base end portions of the pair of guide bolts 11 are fixed to the fixed base 6. Furthermore, each of these guide bolts 11 is externally fitted with a coil machine 11a which is elastically mounted between the lower surface of the auxiliary guide body 10 and the upper surface of the fixed base 6 and urges the auxiliary guide body 10 upward. Thus, the auxiliary guide body 10 is prevented from coming off upward by the guide bolt 11 together with the inner guide body 9 integrally connected to the auxiliary guide body 10, and is also moved upward by the coil elastic machine 11a. It is set so that it may be supported by the fixed base 6 in the state which receives the biasing force which faces.
As will be described later, when the movable member is not in operation, the coil elastic machine 11a has an upper end of the punch body 8d that penetrates the inner guide body 9 as shown by a solid line in FIG. The biasing force is adjusted so as not to protrude from the inner guide body outer peripheral surface 9a (for example, substantially flush).

  Further, in the molding device 5, the inner peripheral surface 9b of the inner guide body 9 and the lower end surface 10d of the auxiliary guide body 10 are in a positional relationship opposite to the upper end surface of the fixed guide body 7 in the vertical direction, In the operating state, a gap is formed between the inner guide body peripheral surface 9 b and the auxiliary guide body lower end surface 10 d and the upper end surface of the fixed guide body 7. Of these gaps, in particular, the gap S2 formed between the left and right end portions of the upper end surface of the fixed guide body 7 and the lower end portion of the inner guide body peripheral surface 9b close to the upper portion of the portion is a protrusion. 2f is set to be larger than the punching stroke S at the time of punching, whereby the inner guide body 9 and the auxiliary guide body 10 move downward integrally toward the fixed guide body 9 when the protrusion 2f is driven. It is set to allow that.

  On the other hand, 12 is an intermediate part in the front-rear direction at both left and right ends of the fixed base 6, and is a pair of guide struts standing integrally between the parts for fixing the pair of guide bolts 11. These guide struts 12 extend in the vertical direction (launching direction) of the auxiliary guide body 10 by movably penetrating through through holes 10e respectively formed in a pair of wing portions 10c formed in the auxiliary guide body 10. It is set to guide the movement. Further, the pair of guide struts 12 protrude above the auxiliary guide body 10, and through holes 13a formed in the left and right end portions of the movable pedestal 13 penetrate through the protruding tip portion in a state in which the movable base 13 can move in the vertical direction. It is supported.

The movable pedestal 13 is integrally provided with an outer guide body 14 positioned above the inner guide body 9. The lower surface 14a of the outer guide body 14 has a circular center on the center line M in the left-right direction of the punch 8 (ring-shaped portion 8c), and is formed in an arc surface set to have the same curvature as the outer peripheral surface of the yoke tube portion 2a. On the lower surface 14a, a punch receiving groove 14b is recessed upward with the center line M in the left-right direction of the punch 8 (ring-shaped portion 8c) as the center, and the outer peripheral surface 9a of the inner guide body 9 is recessed. Is set so as to face the punch main body 8d projecting from the punch.
Further, the fixed base 13 is integrally provided with an outer auxiliary guide body 15 located behind the outer guide body 14 and above the auxiliary guide body 10. The lower surface 15 a of the outer auxiliary guide body 15 is positioned lower than the outer guide body lower surface 14 a and is formed in a flat plate shape so as to face the upper surface of the auxiliary guide body 10.

Next, a procedure for forming the protrusion 2f on the yoke 2 using the forming device 5 will be described.
First, the molded body B for forming the yoke 2 that undergoes punching molding is externally fitted to the front portion of the inner guide body 9 and the front portion of the fixed guide protrusion 7a. At this time, the molded body B is in a state where the inner peripheral surface (cylinder portion 2a) is supported by the inner guide body outer peripheral surface 9a, and the cylindrical bottom portion (cylinder bottom portion 2b) of the molded body B is used as the inner guide body. 9. The fixed guide body protrusion 7a is in a state of abutting against the front end faces 9f and 7f, respectively. Here, a positioning through hole 2h is formed at the radial inner diameter side of the projection 2f formation portion at the cylindrical bottom portion of the molded body B to be the yoke cylindrical bottom portion 2b, while the front end of the inner guide body 9 is formed. The surface 9f is formed with a screw hole 9g that is positioned on the center line M in the left-right direction of the punch 8 and that engages with a positioning screw 16 inserted through the positioning through-hole 2g.

  Then, in a state where the molded body B is externally fitted to the fixed guide body projection 7a and the inner guide body 9, the positioning screw 16 inserted from the positioning through hole 2h side is screwed into the screw hole 9g to be covered. The molded body B is fixed to the fixed base 6 of the molding apparatus 5, and in this state, the movable base 13 is moved downward so that the outer guide body lower surface 14a faces the front end side of the yoke cylinder portion 2a that is the molded body B in the launch direction. Set in a state where it abuts against the outer peripheral surface of (upper part). In this state, the lower surface 15a of the outer auxiliary guide body 15 is set to abut against the upper surface 10b of the auxiliary guide body 10, and in this state, the movable base 13 is moved downward using a movable device (not shown). Then, the outer guide body 14 pressurizes the cylindrical portion of the inner molded body B, so that the inner guide body 9 receives the pressure of the outer guide body 14, and the punch 8 fixed to the fixed guide body 7 becomes the inner guide body. The inner guide body 9 moves downward with respect to the punch 8 fixed to the fixed guide body 7, and the punch body 8d is moved to the workpiece B. The outer periphery of the yoke cylinder portion 2a is pushed out to the punch receiving groove 14b side (outer diameter side) formed in the outer guide body 14 so as to form a protrusion 2f on the outer periphery of the cylinder portion.

  In the present embodiment, the auxiliary guide 10 is integrally provided on the inner guide body 9, and the outer guide body 15 is integrally provided on the outer guide body 14. When the inner guide body 9 is pressed to form 2f, the outer auxiliary guide body 15 is set to press the auxiliary guide body 10, and the outer guide body 14 on the movable pedestal 13 side is pressed against the molded body B. The pushing force can be received by the auxiliary guide body 10 via the inner guide body 9, and the pushing force of the outer guide body 14 can be set large. Thus, the protrusion 2f can be formed by punching with a large driving force in a state where the inner and outer surfaces of the cylindrical portion (yoke cylindrical portion 2a) of the molded body B are guided by both the inner guide body 9 and the outer guide body 14. Thus, the roundness accuracy of the yoke 2 is ensured, and the projection 2f can be formed by a single pushing operation.

  In this embodiment configured as described, when the protrusion 2f is formed on the outer periphery of the cylindrical portion 2a of the yoke 2 constituting the flywheel 1, the yoke 2 is formed by integrally forming the boss portion 2d on the cylindrical bottom portion 2b. However, the protrusion 2f can be formed by stamping. As a result, even when the material of the yoke 2 is formed of a metal material having high hardness, the protrusion 2f can be formed on the outer periphery of the yoke tube portion 2a by a single punching operation, thereby reducing the number of work steps. In addition, it is possible to eliminate waste of materials and to reduce costs.

The molding device 5 for forming the protrusion 2f on the yoke tube portion 2a integrally formed with the boss portion 2d avoids interference between the punch 8 and the boss portion 2d protruding into the tube of the yoke tube portion 2a. As an interference avoiding portion, assuming that a boss through hole 8b is provided in which the boss portion 2d is freely fitted in a state where the boss portion 2d can be moved corresponding to the stroke S, the punch 8 is fixed below the yoke boss portion 2d. Therefore, the inner guide body 9 that guides the yoke cylinder portion 2a from the inside and outside the cylinder can be disposed at an upper portion in the cylinder of the yoke cylinder portion 2a. The protrusion 2f can be formed by stamping while preventing the roundness from being lowered.
As a result, even when the material of the yoke 2 is formed of a metal material having high hardness, the protrusion 2f can be formed on the outer periphery of the yoke tube portion 2a by a single punching operation, thereby reducing the number of work steps. In addition, it is possible to eliminate waste of materials and to reduce costs.

  In addition, in this case, by forming the arc-shaped inner peripheral surface 9b on the inner guide body 9, the inner peripheral surface of the yoke tube portion 2a is widened in the circumferential direction while avoiding interference with the yoke boss portion 2d. It is possible to guide over the entire area, and the roundness of the yoke 2 can be further enhanced.

  Further, in this structure, the inner guide body 9 is provided with an auxiliary guide body 10 located outside the yoke cylinder, and the outer guide body 14 abutted against the outer periphery of the yoke cylinder portion 2a is to form the projection 2f. By pressurizing the yoke tube portion 2a, the projecting force generated in the inner guide body 9 is received via the auxiliary guide body 10 outside the tube of the yoke 2, so that the projecting force from the outer guide body 14 is reduced. The protrusion 2f can be formed by a single punching molding, and the molding operation can be performed with good workability.

1A and 1B are a front view and a side sectional view of a flywheel, respectively. It is the front view which cut the principal part of the shaping | molding apparatus of the rotation signal detection protrusion. It is a partial cross section side view of the shaping | molding apparatus of the rotation signal detection protrusion. It is a top view of the fixed base in the shaping | molding apparatus of the rotation signal detection protrusion. It is a bottom view of the movable base in the shaping | molding apparatus of the rotation signal detection protrusion. It is an expanded side sectional view of the principal part explaining the launching operation by a punch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flywheel 2 Yoke 2a Tube part 2d Boss part 2f Protrusion 5 Molding device 6 Fixed base 7 Fixed guide body 8 Punch 8b Boss through-hole 8c Ring-shaped part 9 Inner guide body 9b Inner peripheral surface 10 Auxiliary guide body 11 Guide bolt 13 Movable Pedestal 14 Outer guide body 14b Punch receiving groove

Claims (4)

  A rotating body in which a boss part in which a drive shaft is fitted to a bottom part of a low and low cylindrical body is integrally formed toward the inner side of the cylinder, and the rotating body is directed to the outer periphery of the cylindrical part from the inner side of the cylindrical part. A rotating body having a rotation signal detecting protrusion formed by punching.   Rotation signal detection protrusions are punched from the inside of the cylindrical portion and formed on the outer periphery of the cylindrical portion of the rotating body, in which a boss portion in which a drive shaft is fitted to the bottom of the low and low cylindrical body is integrally formed toward the inner side of the cylinder A fixed guide body that fits the forming device in a loosely fitting manner on the proximal end side in the launching direction of the tubular portion, and an inner guide that is fitted in the loosely fitted shape on the distal end side in the launching direction of the tubular portion and abuts against the inner periphery of the tubular portion Between the body, the fixed part fixed to the fixed guide body, and the main body part that penetrates the inner guide body so that it can be moved in the launch direction and is abutted against the inner periphery of the cylindrical part to project the protrusion. The punch is formed with an interference avoiding portion for avoiding the punch, and is provided with an outer guide body that is formed with a punch receiving groove and abuts against the outer periphery of the cylindrical portion on the front end side in the projecting direction to give the projecting force of the projection. A device for forming a projection for detecting a rotation signal in a rotating body.   The interference avoiding portion is constituted by a through hole that is loosely fitted to the rotating boss portion, and the inner diameter of the through hole is a size that allows relative movement of the boss portion corresponding to the punching stroke by the punch. The apparatus for forming a protrusion for detecting a rotation signal in the rotating body according to claim 2, wherein the apparatus is configured as follows.   The inner guide body is integrally provided with an auxiliary guide body extending outside the cylinder of the yoke, and is configured to receive a punching force from the outer guide body via the auxiliary guide body. A device for forming a projection for detecting a rotation signal in the rotating body according to claim 1.

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