JPH0985378A - Production of timing pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily produce a highly precise timing pulley. SOLUTION: A pulley base material 2 having the outer peripheral edge part of a metal-made disk as a belt-setting part forming part 1 is clamped with clampers 3, 4 from both sides and a tooth-cutting die 11 is pressed to the belt- setting section forming part 1 and both of them are rotated, and a tooth-form is formed on the belt-setting section forming part 1 to produce the timing pulley. On a rotary shaft of the tooth-cutting die 11, a first guiding gear 14 integrally rotated with the tooth-cutting die 11 is provided and further, on a clamper rotary shaft, a second guiding gear 9 engaged with the first guiding gear 14 is provided. During a process for pressing the tooth-cutting die 11 to the belt- setting section forming part 1 of the pulley base material, the circumferential speed of the tooth-cutting die 11 and that of the pulley base material 2 are matched by engaging the first guiding gear 14 with the second guiding gear 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention clamps a pulley base material having an outer peripheral end portion of a metal disk as a belt hooking portion forming portion from both sides by a clamper and pushes a gear cutting die on the belt hooking portion forming portion. The present invention relates to a method of manufacturing a timing pulley in which both are pressed to rotate and a tooth profile is formed in a belt hooking portion forming portion.

[0002]

2. Description of the Related Art A timing pulley is a pulley having a tooth profile on its outer circumference and is used as a transmission rotating portion. In the conventional method of manufacturing such a timing pulley, generally, a method by casting, a method by cutting using a gear cutting machine from casting or a round bar, a method of directly extruding by forging, a method of molding iron powder and sintering There are known methods, and further, a method of pressing the peripheral wall of the cylindrical body into unevenness.

In the above-mentioned casting or cutting method, the manufacturing work is troublesome and time-consuming, the productivity is low, and it is difficult to reduce the weight. Particularly, when the cutting method is used, chips are generated and the material is wasted. There is such a problem. Further, the method of directly extruding by forging requires a large amount of energy, and the method of injecting iron powder into the material and sintering it has a problem that the material cost is very high and the cost is high. In addition, the method of pressing the peripheral wall of the cylindrical body into an uneven shape can reduce weight and prevent waste of material, but has a problem that accuracy is poor and strength is low and durability is poor.

As a method of manufacturing a timing pulley which solves the above problems, a pulley base material having an outer peripheral end portion of a metal disk as a belt hooking portion forming portion is clamped from both sides by a clamper, and the belt hooking portion forming portion is formed. A method for manufacturing a timing pulley has been developed in which a gear cutting die is pressed against the both to rotate the two and form a tooth profile in the belt hooking portion forming portion.

[0005]

SUMMARY OF THE INVENTION A pulley base material having an outer peripheral end portion of the above metal disc as a belt hooking portion forming portion is clamped from both sides by clampers, and a gear cutting die is pressed against the belt hooking portion forming portion. According to the manufacturing method of the timing pulley in which both are applied to rotate and the tooth profile is formed in the belt hooking portion forming portion, the manufacturing is easy, robust and durable,
Although there is no waste of material and the weight can be reduced and the cost can be obtained at low cost, there is a possibility that the rotation of the pulley base material and that of the gear cutting die may deviate. If this deviation occurs, the pulley base material There is a problem that the teeth of the gear cutting die get on the teeth formed on the belt hooking part, the teeth formed on the outer peripheral end surface of the metal disk collapse and the teeth surface has streaks. .

In view of the above points, the present invention provides a method of manufacturing a timing pulley for the purpose of synchronizing the rotations of a pulley base and a gear cutting die so that a highly accurate timing pulley can be easily manufactured. Is.

[0007]

SUMMARY OF THE INVENTION A method of manufacturing a timing pulley according to the present invention comprises a pulley base material having an outer peripheral end portion of a metal disc as a belt hooking portion forming portion, clamped from both sides by a clamper, and the belt hooking portion. A method for manufacturing a timing pulley in which a gear cutting die is pressed against a portion forming portion to rotate both, and a tooth profile is formed in a belt hooking portion forming portion, wherein the gear cutting die is integrally formed with the gear cutting die on a rotation shaft of the gear cutting die. And a second induction gear that can mesh with the first induction gear are provided on the clamper rotation shaft, and the gear cutting die is used as a belt hooking portion forming portion of the pulley base material. In the pressing step, the peripheral speed of the gear cutting die and the peripheral speed of the pulley base material are synchronized with each other by engaging the first guide gear and the second guide gear with each other.

According to the present invention, a first induction gear that rotates integrally with the gear cutting die is provided on the rotary shaft of the gear cutting die, and the first guide gear meshes with the rotary shaft of the clamper. In the step of providing a possible second induction gear and pressing the gear cutting die against the belt hooking portion forming portion of the pulley base material,
Since the peripheral speed of the gear cutting die and the peripheral speed of the pulley base material are synchronized by meshing the first guide gear and the second guide gear with each other, the pulley base material and the teeth of the gear base cutting die form a belt hook portion of the pulley base material. In the step of pressing against the portion, the teeth of the gear cutting die are prevented from riding on the teeth formed on the belt hooking portion forming portion of the pulley base material, and a highly accurate timing pulley can be obtained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2 show the steps for carrying out the invention according to claim 1. First, a pulley base material 2 in which a metal plate is formed by stamping a metal plate to form a punched metal disk, and the outer peripheral end portion of the metal plate is used as a belt hook forming portion 1.
And This pulley base material 2 is clamped from both sides by clampers 3 and 4. Into the clampers 3 and 4, relief portions 5 and 6 for allowing the belt hooking portion forming portion 1 to be extruded to both sides by a gear cutting die to be described later, respectively, and an inner peripheral surface of the cylindrical portion. Support surfaces 7 and 8 are formed so as to abut on and support the same. Further, one of the clampers 3 and 4 is provided with a second guide gear 9 which meshes with a first guide gear described later and synchronizes the peripheral speed of the pulley base 2 and the peripheral speed of the gear cutting die. Clamper 4
Are provided on the rotation axis. 10 is a bolt.

On the other hand, the gear cutting die 11 for forming teeth by pressing it against the belt hooking portion forming portion 1 of the pulley base material 2 is clamped by the clampers 3 and 4.
It is rotatably supported by a support 12 that moves in the direction. A first guide gear 14 that rotates integrally with the gear cutting die 11 is provided on the rotary shaft 13 of the gear cutting die 11. The first guide gear 14 is provided on the clamper 4 in the step of pressing the gear cutting die 11 against the belt hooking portion forming portion 1 of the pulley base material 2 clamped by the clampers 3 and 4. It meshes with the guide gear 9, and the peripheral speed of the gear cutting die 11 and the peripheral speed of the pulley base 2 are synchronized by the first guide gear 14 and the second guide gear 9.

In this embodiment, the first guide gear 14 is formed with teeth 16 having the same diameter as the gear cutting die 11 and the same pitch as the teeth 15 of the gear cutting die 11, while the clamper 4 is used.
The diameter of the second induction gear 9 provided on the
The timing pulley is manufactured to have the same diameter as that of the timing pulley, and the teeth 17 are formed at the same pitch as the teeth 15 of the gear cutting die 11. (FIG. 1) The gear cutting die 11 supported by the support 12 is pressed against the belt hooking portion forming portion 1 of the pulley base material 2 which is clamped by the clampers 3, 4, and the clampers 3, 4 and the gear cutting are performed. Rotate the die 11. As a result, the belt hooking portion forming portion 1 is pressed and crushed by the gear cutting die 11 to form teeth on the outer peripheral end face thereof, and the cylindrical portions are formed on both sides of the pulley base material 2 in the escape portions 5 and 6 of the clampers 3 and 4. 18 and 19 are formed, and by further pressing the gear cutting die 11, the inner peripheral surfaces of the cylindrical portions 18 and 19 come into contact with the support surfaces 7 and 8 of the clampers 3 and 4, and the cylindrical portions 18 and 19 are cut. Dice 1
1 and the supporting surfaces 7 and 8 clamp the cylindrical portions 18 and 19
Have almost the same wall thickness.

When the gear cutting die 11 is pushed into this state, the first guide gear 14 provided on the rotary shaft 13 of the gear cutting die 11 and the second guide gear provided on the clamper 4 are provided.
The guide gear 9 meshes. This ensures that the peripheral speed of the gear cutting die 11 and the peripheral speed of the pulley base 2 are synchronized. Further, by pushing the gear cutting die 11 until the first guide gear 14 and the second guide gear 9 are completely meshed with each other and continuing to rotate, the mountain portion is formed on the belt hooking portion forming portion 1 which has become the cylindrical portions 18 and 19. Teeth 2 with no collapse of the teeth and no streaks in the mountains
Zeros are formed at the same pitch as the teeth 15 of the gear cutting die 11 over the entire circumference. (FIG. 2).

3 to 5 show the steps for carrying out the invention according to the second aspect. First, a metal plate is stamped out to form a metal disc, and the pulley base 2 is clamped from both sides by clampers 21 and 22. In each of the clampers 21 and 22, the outer periphery of the pulley base material 2 is slit into left and right parts by a slitting roller die, which will be described later, and the divided pieces are spread by a smooth roller die to form a cylindrical shape. Relief portions 23 and 24 that allow the above-mentioned operation and support surfaces 25 and 26 that abut against and support the inner peripheral surface of the cylindrical portion are formed. Further, one of the clampers 21, 22 is engaged with a first guide gear described later, and a second guide gear 27 that synchronizes the peripheral speed of the pulley base 2 with the peripheral speed of a gear cutting die described later. Are provided on the rotary shaft of the clamper 22. 28 is a bolt.

Next, the outer periphery of the pulley base material 2 is slotted into a V-shape by pressing and rotating the slitting roller die 29 against the outer peripheral end surface of the pulley base material 2 clamped by the clampers 21 and 22. (Figure 3).

Next, the smooth roller die 30 is pressed against the divided pieces divided into two pieces by slitting and rotated, so that the pulley base material 2 is projected in a cylindrical shape on both sides,
The cylindrical protrusion is squeezed by the smooth roller die 30 and the supporting surfaces 25 and 26 to form a rim 31 that is spread on both sides at the outer peripheral end of the pulley base material 2.
Is referred to as a belt hanging portion forming portion 1 (FIG. 4).

Next, the gear cutting die 32 is pressed against the belt hooking portion forming portion 1 formed on the outer peripheral end portion of the pulley base material 2. The gear cutting die 32 is rotatably supported by a support body 33 that is clamped by the clampers 21 and 22 and that moves in the direction of the pulley base material 2. A first guide gear 35 that rotates integrally with the gear cutting die 32 is provided on the rotating shaft 34 of the gear cutting die 32.

The first guide gear 35 is provided on the clamper 22 in the step of pressing the gear cutting die 32 against the belt hooking portion forming portion 1 of the pulley base 2 clamped by the clampers 21, 22. It meshes with a certain second guide gear 27, and the peripheral speed of the gear cutting die 32 and the peripheral speed of the pulley base 2 are synchronized by the first guide gear 35 and the second guide gear 27.

In this embodiment, the first guide gear 35 is formed with teeth 37 having the same diameter as the gear cutting die 32 and the same pitch as the teeth 36 of the gear cutting die 32, while the clamper 2
The second induction gear 27 provided in No. 2 has the same diameter as the timing pulley manufactured by the pulley base material 2, and the pitch of the teeth 38 is the teeth 36 of the gear cutting die 32.
Are formed at the same pitch as.

The gear cutting die 32 supported by the support 33 is pressed against the belt hooking portion forming portion 1 of the pulley base member 2 clamped by the clampers 21, 22 to clamp the clampers 21, 22 and the gear cutting die 32. To rotate. As a result, the gear cutting die 32 forms the teeth 39 on the belt hooking portion forming portion 1, but at this time, the first guide gear 35 and the second guide gear 27 are meshed with each other. This makes the gear cutting die 3
The peripheral speed of the pulley base material 2 and the peripheral speed of the pulley base material 2 are surely synchronized with each other, and in the process of rotation of the gear cutting die 32 and the pulley base material 2, the belt base forming part 1 of the pulley base material 2 is formed. There is no possibility that the teeth 36 of the gear cutting die 32 will ride on the piles of the formed teeth 39, and all the teeth 39 on the belt hooking portion forming portion 1 without the collapse of the peaks or the generation of streaks or the like on the peaks. The teeth 36 of the gear cutting die 32 are formed at the same pitch over the circumference (FIG. 5).

6 to 8 show the steps of carrying out another embodiment of the invention described in claim 2. First, a metal plate is punched out to form a metal disk, and the pulley base 2 is clamped from both sides by clampers 40 and 41. The clampers 40 and 41 are provided with relief portions 42 and 43, respectively, which allow the outer periphery of the pulley base material 2 to be described later to be crushed by a smooth roller die and spread laterally to form a cylindrical shape. Supporting surfaces 44 and 45 are formed so as to contact the inner peripheral surface of the cylindrical portion and support the same. In addition, in the escape portions 42 and 43, a gap forming portion 46 that forms a gap between the relief roller die and the side surface of the smooth roller die,
47 are formed. Further, the clampers 40, 4
A second guide gear 48, which meshes with a first guide gear to be described later and synchronizes the peripheral speed of the pulley base 2 and the peripheral speed of the gear cutting die, is provided on one of the clampers 41 on the rotating shaft of the clamper 41. It is provided. 49 is a bolt (FIG. 6).

Next, the smooth roller die 50 is pressed against the outer peripheral end surface of the pulley base material 2 clamped by the clampers 40 and 41 and rotated. As a result, the outer peripheral end portion of the pulley base material 2 is crushed and protrudes in a cylindrical shape on both sides of the pulley base material 2, and the cylindrical protruding portion is pressed by the smooth roller die 50 and the supporting surfaces 44, 45. Thus, the rim 51 is formed on the outer peripheral end of the pulley base material 2. This rim 51 is referred to as a belt hooking portion forming portion 1. Further, the end portion of the protruding portion is formed between the side surface of the smooth roller die 50 and the escape portions 42, 43 by pressing the cylindrical protruding portion between the smooth roller die 50 and the supporting surfaces 44, 45. The flange portions 52 and 53 are formed at both ends of the rim 51, that is, both ends of the belt hooking portion forming portion 1 by escaping to the gap forming portions 46 and 47. The flanges 52 and 53 are used to prevent the belt from coming off (FIG. 7).

Next, the gear cutting die 54 is pressed against the belt hooking portion forming portion 1 formed on the outer peripheral end portion of the pulley base material 2. The gear cutting die 54 is rotatably supported by a support body 55 that is clamped by the clampers 40 and 41 and that moves in the direction of the pulley base material 2. Further, a first guide gear 57 that rotates integrally with the gear cutting die 54 is provided on the rotating shaft 56 of the gear cutting die 54.

The first guide gear 57 is provided on the clamper 41 in the step of pressing the gear cutting die 54 against the belt hooking portion forming portion 1 of the pulley base 2 clamped by the clampers 40 and 41. It meshes with a certain second guide gear 48, and the peripheral speed of the gear cutting die 54 and the peripheral speed of the pulley base 2 are synchronized by the first guide gear 57 and the second guide gear 48.

In this embodiment, the first guide gear 57 is formed with teeth 59 having the same diameter as the gear cutting die 54 and the same pitch as the teeth 58 of the gear cutting die 54, while the clamper 4 is used.
The second guide gear 48 provided in No. 1 has the same diameter as the timing pulley manufactured by the pulley base material 2, and the pitch of the teeth 60 is the teeth 58 of the gear cutting die 54.
(FIG. 7) The gear cutting die 54 supported by the support 55 is pressed against the belt hooking portion forming portion 1 of the pulley base material 2 clamped by the clampers 40, 41. Clamper 40, 41
And the gear cutting die 54 is rotated.

As a result, the gear cutting die 54 forms the teeth 61 on the belt hooking portion forming portion 1. At this time, the first guide gear 57 and the second guide gear 48 are meshed with each other. This ensures that the peripheral speed of the gear cutting die 54 and the peripheral speed of the pulley base material 2 are synchronized with each other, and the belt hooking portion of the pulley base material 2 is formed during the rotation process of the gear cutting die 54 and the pulley base material 2. The tooth 58 of the gear cutting die 54 is formed on the crest of the tooth 61 formed on the portion 1.
There is no possibility of a situation where the
Teeth 61 having no crests and no streaks in crests are formed at the same pitch as the teeth 58 of the gear cutting die 54 on the belt hooking portion forming portion 1 (FIG. 8).

9 to 11 show the steps for carrying out the invention according to the third aspect. First, the pulley base material 2 is formed as a cylindrical portion 63 by squeezing a metal disk by a press or the like so that the outer peripheral end portion of the disk portion 62 is cylindrically projected to one side. The pulley base 2 has an annular protrusion 64 formed at the corner between the disc portion 68 and the cylindrical portion 63. The pulley base material 2 has a cylindrical protrusion 65 having a smaller diameter than the inner diameter of the cylindrical portion 63 and shorter than the cylindrical portion 63, and is brought into contact with the base end of the cylindrical protrusion 65 at the opening end of the cylindrical portion 63. A clamper 67 having a tapered portion 66 that spreads out in the centrifugal direction is brought into contact with the outer surface of the disc portion 62, and the annular groove 6 is provided on the contact surface at a position corresponding to the annular protrusion 64.
It clamps by the clamper 69 which formed 8. The clampers 67 and 69 clamp the pulley base member 2 for rotation, and the clamper 67 moves the cylindrical portion 63 in the axial direction, that is, moves to the clamper 69 side to compress it. Further, the clamper 69 meshes with a first guide gear provided on the rotary shaft of the gear cutting die, which will be described later, to synchronize the peripheral speed of the pulley base 2 with the peripheral speed of the gear cutting die 70. Are provided on the rotary shaft of the clamper 69. 71 is a bolt.

A smooth roller die 73 having a molding portion 72 corresponding to the belt width is pressed against the outer peripheral surface substantially central portion of the cylindrical portion 63 of the pulley base material 2 clamped as described above. The smooth roller die 73 presses the cylindrical portion 63 in the axial direction to reduce its diameter, and moves in the same direction as the clamper 67 compresses and moves (FIG. 9).

Next, while rotating the clampers 67, 69 and the smooth roller die 73, the clamper 67 is compressed in the direction of the clamper 69, and the smooth roller die 73 is pressed in the axial direction. By the compression of the clamper 67 and the pressing of the smooth roller die 73, the diameter of the substantially central portion of the cylindrical portion 63 is reduced until it comes into contact with the outer periphery of the cylindrical protrusion 65 of the clamper 67, and the open end of the cylindrical portion 63 is Further expanded by the taper portion 66 and pinched by the taper 66 and the side surface of the smooth roller die 73, a flange portion 74 is formed at the open end of the cylindrical portion 63.
On the other hand, the annular protrusions 64 at the corners of the cylindrical portion 63 and the disc portion 62 are provided on the side surface of the smooth roller die 73 and the clamper 69.
And are squeezed and crushed to form the collar portion 75. The substantially central portion of the cylindrical portion 63 whose diameter is reduced in this way is referred to as the belt hooking portion forming portion 1 (FIG. 10).

Next, the gear cutting die 76 is pressed against the belt hooking portion forming portion 1 formed on the outer peripheral end portion of the pulley base material 2. The gear cutting die 76 is rotatably supported by a support body 77 that is clamped by clampers 67 and 69 and that moves in the pulley base material 2 direction. A first guide gear 79 that rotates integrally with the gear cutting die 76 is provided on the rotary shaft 78 of the gear cutting die 76.

The first guide gear 79 is provided on the clamper 69 in the step of pressing the gear cutting die 76 against the belt hooking portion forming portion 1 of the pulley base 2 clamped by the clampers 67, 69. It meshes with a certain second induction gear 70, and the peripheral speed of the gear cutting die 76 and the peripheral speed of the pulley base 2 are synchronized by the first induction gear 79 and the second induction gear 70.

In this embodiment, the first guide gear 79 is formed with teeth 81 having the same diameter as the gear cutting die 76 and the same pitch as the teeth 80 of the gear cutting die 76, while the clamper 6 is used.
The second induction gear 70 provided on the shaft 9 has the same diameter as the timing pulley manufactured by the pulley base 2, and the pitch of the teeth 82 is the teeth 80 of the gear cutting die 76.
Are formed at the same pitch as.

The gear cutting die 76 supported by the support 77 is pressed against the belt hooking portion forming portion 1 of the pulley base 2 which is clamped by the clampers 67, 69, and the clampers 67, 69 and the gear cutting die 76 are pressed. To rotate. As a result, the gear cutting die 76 forms the teeth 83 on the belt hooking portion forming portion 1, but at this time, the first guide gear 79 and the second guide gear 70 are meshed with each other. This makes the gear cutting die 76
The peripheral speed of the pulley base material 2 and the peripheral speed of the pulley base material 2 are surely synchronized with each other, and they are formed on the belt hooking part forming part 1 of the pulley base material 2 during the rotation process of the gear cutting die 76 and the pulley base material 2. There is no possibility that the tooth 80 of the gear cutting die 76 will ride on the crest of the tooth 83, and the tooth 83 with no collapse of the crest or streak in the crest is formed on the entire circumference of the belt hooking part forming portion 1. The teeth 80 of the gear cutting die 76 are formed over the same pitch (FIG. 11).

[0033]

According to the present invention, the first induction gear that rotates integrally with the gear cutting die is provided on the rotary shaft of the gear cutting die, and the first guide gear is provided on the rotary shaft of the clamper. In the step of providing a meshable second induction gear and pressing the gear cutting die against the belt hooking portion forming portion of the pulley base material, the peripheral speed of the gear cutting die is brought into mesh with the first induction gear and the second induction gear. And the peripheral speed of the pulley base material are synchronized, the pulley base material and gear cutting die are formed on the belt base material forming part of the pulley base material in the process of pressing the gear base cutting part of the pulley base material. It is possible to prevent the gear cutting die from riding on the formed tooth, and to obtain a highly accurate timing pulley.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process of a timing pulley according to claim 1.

FIG. 2 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 1.

FIG. 3 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 2;

FIG. 4 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 2;

FIG. 5 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 2;

FIG. 6 is an explanatory view showing an example of another manufacturing process of the timing pulley according to claim 2;

FIG. 7 is an explanatory view showing an example of another manufacturing process of the timing pulley according to claim 2;

FIG. 8 is an explanatory view showing an example of another manufacturing process of the timing pulley according to claim 2;

FIG. 9 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 3;

FIG. 10 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 3;

FIG. 11 is an explanatory view showing an example of a manufacturing process of the timing pulley according to claim 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt hook forming part 2 Pulley base material 3 Clamper 4 Clamper 5 Escape part 6 Escape part 7 Support surface 8 Support surface 9 Second induction gear 10 Bolt 11 Gear cutting die 12 Support body 13 Rotating shaft 14 First induction gear 15 Teeth 16 teeth 17 teeth 18 cylindrical portion 19 cylindrical portion 20 teeth 21 clamper 22 clamper 23 escape portion 24 escape portion 25 support surface 26 support surface 27 second induction gear 28 bolt 29 grinding roller die 30 smooth roller die 31 rim 32 tooth cutting die 33 Support 34 Rotating Shaft 35 First Induction Gear 36 Teeth 37 Teeth 38 Teeth 39 Teeth 40 Clampers 41 Clampers 42 Relief 43 Relief 44 Supporting Surface 45 Supporting Surface 46 Gap Forming 47 Gap Forming 48 Second Induction Gear 49 Bolts 50 Smooth Roller Die 51 Rim 52 Collar Part 53 Collar 54 gear cutting die 55 support 56 rotary shaft 57 first induction gear 58 teeth 59 teeth 60 teeth 61 teeth 62 disk part 63 cylindrical part 64 annular protrusion 65 cylindrical protrusion 66 taper part 67 clamper 68 annular recess groove 69 clamper 70 Second Induction Gear 71 Bolt 72 Molding Part 73 Smooth Roller Die 74 Collar Part 75 Collar Part 76 Gear Cutting Die 77 Support 78 Rotating Shaft 79 First Induction Gear 80 Teeth 81 Teeth 82 Teeth 83 Teeth

Claims (3)

[Claims] 1. A pulley base having an outer peripheral end of a metal disc as a belt hooking portion forming portion is clamped from both sides by a clamper, and a gear cutting die is pressed against the belt hooking portion forming portion to rotate both. A method for manufacturing a timing pulley for forming a tooth profile on a belt hooking portion forming portion, wherein the timing pulley is integrally rotated with a gear cutting die on a rotation axis of the gear cutting die.
In the step of providing an induction gear, and providing a second induction gear on the rotation axis of the clamper capable of meshing with the first induction gear, and pressing the gear cutting die against the belt hooking portion forming portion of the pulley base, A method for manufacturing a timing pulley, characterized in that the peripheral speed of a gear cutting die and the peripheral speed of a pulley base material are synchronized by meshing a first guide gear and a second guide gear. 2. The pulley base material comprises a metallic disc, the outer peripheral ends of which are projected to both sides of the metallic disc to form a rim, and the rim serves as a belt hooking portion forming portion. A method for manufacturing the described timing pulley. 3. The pulley base material comprises a metallic disc having an outer peripheral end portion cylindrically projected to one side of the metallic disc, and the cylindrical portion serving as a belt hook forming portion. A method for manufacturing the described timing pulley.