JPH08270759A - Toothed pulley - Google Patents

Abstract

PURPOSE: To facilitate the fitting of a ring plate to a toothed pulley formed by fitting the ring plate formed of magnetic material, to the toothed pulley with the body formed of non-magnetic material, concentrically with the rotation axis or the toothed pulley and providing tooth form radially extended from the ring plate so as to serve as a signal generating member. CONSTITUTION: A rolled steel plate is punched to provide tooth form C and each bent part D on the same line being extended to the radial outside of a ring plate B. This ring plate B is insert-molded at the time of molding a toothed pulley A formed of phenol resin, and the tent parts D are embedded in the resin and fixed. The tent parts D are tent at an angle of 45 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed pulley having a main body made of a non-magnetic material and having a function of detecting a rotation angle and a rotation speed.

[0002]

2. Description of the Related Art A toothed pulley can transmit power without slipping in combination with a toothed belt and is used for driving a cam shaft of a four-cycle internal combustion engine. Recently, some toothed pulleys are provided with a function for detecting the rotation angle and the number of rotations. If the main body is a toothed pulley made of non-magnetic material such as resin or aluminum die casting,
Blocks of magnets or magnetic materials (steel materials), which are signal generating members, are arranged in the main body on the circumference of a circle concentric with the rotating shaft at equal intervals or at appropriate intervals for detecting the rotation angle.
If the main body is a toothed pulley made of sintered metal, which is a magnetic material, the main body of the toothed pulley is a signal generating member on the circumference of a circle concentric with the rotation axis at equal or appropriate intervals for detecting the rotation angle. Is provided. The rotation angle is measured by placing a magnetic sensor for detecting passage of the signal generating member on the rotation locus of the signal generating member during rotation of the toothed pulley,
The detection output from the magnetic sensor is used as a signal for setting the ignition timing and the fuel injection timing of the internal combustion engine.

By the way, in the case of a toothed pulley whose main body is made of a non-magnetic material, the one obtained by arranging the block of the above magnetic material (steel material) as a signal generating member can produce an output obtained from a magnetic sensor by utilizing an electromagnetic induction action. The output tends to be lower than the output similarly obtained by using a sintered toothed pulley having irregularities as a signal generating member. When the output obtained from the magnetic sensor is low, the obtained waveform output is
When converting the control waveform to N or OFF and setting the ignition timing or the fuel injection timing of the internal combustion engine, the noise filter of the control circuit may cut the waveform having a low output, and a normal control waveform may not be obtained. Therefore, in a toothed pulley whose main body is made of a non-magnetic material, it has been proposed to arrange a magnet as a signal generating member in order to increase the output obtained from the magnetic sensor. It has been proposed to obtain an output equivalent to that obtained when a sintered metal toothed pulley provided with irregularities is used without changing the specifications of the magnetic sensor by changing the above. However, in this case, when the number of magnets used as the signal generating member increases, it is more expensive than the toothed pulley using a block of magnetic material (steel material) as the signal generating member. To eliminate this,
A ring-shaped plate made of a magnetic material is attached concentrically with the rotating shaft of the toothed pulley, and a tooth profile that extends from the ring-shaped plate in the radial direction is provided as a signal generating member. It has been proposed to obtain high output at low cost. In this technique, the means for arranging and fixing the ring-shaped plate having the tooth profile as the signal generating member to the toothed pulley is to attach the ring-shaped plate with an adhesive after molding the toothed pulley. , Man-hours required for bonding are required.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to attach a ring-shaped plate made of a magnetic material to a toothed pulley whose main body is made of a non-magnetic material so as to be concentric with the rotating shaft of the toothed pulley. In the one provided with the tooth profile extended from the plate in the radial direction as a signal generating member,
It is to provide a structure that facilitates attachment of a ring-shaped plate to a toothed pulley. In addition, this mounting structure prevents noise waveforms from appearing in the waveforms detected by the magnetic sensor.

[0005]

In order to solve the above-mentioned problems, a toothed pulley according to the present invention is provided with a bent portion provided on a tooth profile extending in a radial direction from a ring-shaped plate,
It has a structure in which the processed portion is embedded in the toothed pulley by insert molding. The bent portion is provided extending from the tooth profile in the radial direction or the circumferential direction of the ring-shaped plate. When the bent portion is provided extending from the tooth profile in the radial direction of the ring-shaped plate, it can be extended in the same direction as the extending direction of the tooth profile or in the opposite direction with the ring-shaped plate sandwiched therebetween. When the bent portion is provided extending from the tooth profile in the circumferential direction of the ring-shaped plate, it can be extended to one side or both sides of the tooth profile. In any case, the bending angle of the bent portion can be selected from smaller than 90 °, larger than 90 ° and larger than 90 °.

[0006]

The toothed pulley according to the present invention is used by disposing the magnetic sensor on the rotation locus of the tooth profile of the ring-shaped plate.
With the configuration according to the present invention, the ring-shaped plate can be insert-molded at the time of molding the toothed pulley, and the bent portion extended from the tooth profile can be embedded and fixedly disposed in the toothed pulley. By providing the bent portion on the ring-shaped plate, the step of mounting the ring-shaped plate on the toothed pulley is not necessary, and the mounting step is facilitated. If the bent part is extended from the tooth profile in the radial direction of the ring-shaped plate, the waveform detected by the magnetic sensor has no noise waveform and the amount of magnetic material passing through the magnetic sensor increases, resulting in a large change in magnetic flux. A very high output waveform can be obtained. This is also the case when the bent portion is provided extending from the tooth profile in the circumferential direction of the ring-shaped plate, and in particular, it extends from the tooth profile to one side in the circumferential direction of the ring-shaped plate, and that one side rotates the toothed pulley. When viewed from the direction, the change in magnetic flux becomes large when the side is on the front side.

[0007]

【Example】

Example 1 As shown in FIGS. 1 and 2, a toothed pulley A is a phenol resin molding in which a ring-shaped plate B (outer diameter: 52 mm, inner diameter: 40 mm) is insert-molded concentrically with the rotating shaft of the toothed pulley A. It consists of goods. The surfaces of the ring-shaped plate B and the tooth profile C are on the same plane as the main body of the toothed pulley A, and the bent portion D is embedded in the resin. As shown in FIG. 3, the ring-shaped plate B is provided with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on the outer periphery of the ring-shaped plate B extending radially outward from the ring-shaped plate B. It is used as a signal generation member.
Further, a bent portion D (length: 8 mm) is provided further on the tip. As shown in FIG. 2, the bent portion D is bent at an angle of 45 °. Ring-shaped plate B, tooth profile C
The bent portion D is formed by punching a general structural rolled steel sheet (JIS G3101) having a thickness of 1.6 mm, and integrally formed, and the bent portion D is formed by pressing thereafter. As shown in FIG. 4, the toothed pulley A is used by arranging the magnetic sensor E at a position on the center of the tooth profile C in the longitudinal direction. Magnetic sensor E with tooth profile C and 1.0
The toothed pulley A is placed at 100 rpm with 100 mm spacing.
The output waveform obtained from the magnetic sensor was measured by rotating at. The output value and the manufacturing cost of the toothed pulley are shown in Table 1. The manufacturing cost was expressed as a relative value when the cost of Comparative Example 1 was 100.

Embodiment 2 As shown in FIG. 5, a ring-shaped plate B (outer diameter: 80 m
m, inner diameter: 68 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its inner circumference.
The signal generating member is provided by extending inward in the radial direction. Further, a bent portion D (length: 8 mm) is provided further on the tip. As with the first embodiment, the bent portion D is 45
It was bent at an angle of ° and insert-molded. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 3 As shown in FIG. 6, a ring-shaped plate B (outer diameter: 80 m
m, inner diameter: 68 mm), 4 at every 90 ° angle on its inner circumference
A tooth profile C (width: 5 mm, length: 8 mm) is provided extending inward in the radial direction of the ring-shaped plate B to serve as a signal generating member. Further, the ring-shaped plate B is sandwiched between the toothed shape C and the toothed shape C to extend outward in the radial direction and the bent portion D (width:
5 mm, length: 8 mm). Similarly to Example 1, the bent portion D was bent at an angle of 45 ° and insert-molded. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 4 As shown in FIG. 7, a ring-shaped plate B (outer diameter: 80 m
m, inner diameter: 68 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its inner circumference.
The signal generating member is provided by extending inward in the radial direction. Further, a bent portion D (width: 5 mm, length: 5 m) extending from the tooth profile C to both sides of the ring-shaped plate B in the circumferential direction.
m) is provided. The bent portion D was bent at an angle of 45 ° to form a trapezoidal cross section with the tooth profile C as the upper side, and insert molding was performed as in Example 1. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 5 As shown in FIG. 8, a ring-shaped plate B (outer diameter: 80 m
m, inner diameter: 68 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its inner circumference.
The signal generating member is provided by extending inward in the radial direction. Further, a bent portion D (width: 5 mm, length: 5 m) extending from the tooth profile C to one side in the circumferential direction of the ring-shaped plate B.
m) is provided. The one side on which the bent portion D is provided is located on the front side as viewed in the rotation direction of the toothed pulley. The bending portion D is set to 4 as in the fourth embodiment.
It was bent at an angle of 5 ° and insert-molded in the same manner as in Example 1. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 6 As shown in FIG. 9, a ring-shaped plate B (outer diameter: 52 m
m, inner diameter: 40 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on the outer circumference.
The signal generating member is provided by being extended outward in the radial direction. Further, the ring-shaped plate B is sandwiched between the toothed shape C and the toothed shape C, and the bent portion D is extended inward in the radial direction (width: 5).
mm, length: 8 mm). Similarly to Example 1, the bent portion D was bent at an angle of 45 ° and insert-molded. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 7 As shown in FIG. 10, a ring-shaped plate B (outer diameter: 52
mm, inner diameter: 40 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its outer circumference.
The signal generating member is provided by being extended outward in the radial direction. Further, the bent portion D is extended to both sides of the tooth profile C in the circumferential direction of the ring-shaped plate B (width: 5 mm, length: 5 m).
m) is provided. The bent portion D was bent at an angle of 45 ° to form a trapezoidal cross section with the tooth profile C as the upper side, and insert molding was performed as in Example 1. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 8 As shown in FIG. 11, a ring-shaped plate B (outer diameter: 52
mm, inner diameter: 40 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its outer circumference.
The signal generating member is provided by being extended outward in the radial direction. Further, a bent portion D (width: 5 mm, length: 5 m) extending from the tooth profile C to one side in the circumferential direction of the ring-shaped plate B.
m) is provided. The one side on which the bent portion D is provided is located on the front side as viewed in the rotation direction of the toothed pulley. The bent portion D is 4 as in the seventh embodiment.
It was bent at an angle of 5 ° and insert-molded in the same manner as in Example 1. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Example 9 In Example 1, the bent portion D was bent at an angle of 90 ° as shown in FIG. 12 and insert-molded. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Example 10 In Example 1, the bent portion D was bent at an angle of 135 ° as shown in FIG. 13 and insert-molded. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Embodiment 11 As shown in FIG. 14, a ring-shaped plate B (outer diameter: 52
mm, inner diameter: 40 mm), and four tooth profiles C (width: 5 mm, length: 16 mm) are provided on the outer circumference of the ring-shaped plate B at 90 ° intervals to extend outward in the radial direction of the ring-shaped plate B to serve as a signal generating member. . In addition, the bent part D (length: 8 mm)
Is provided. The bent portion D was provided with a through hole having a diameter of 2 mm at the center thereof. Similarly to Example 9, the bent portion D was bent at an angle of 90 ° and insert-molded.
Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.
It was shown to.

Comparative Example 1 As shown in FIG. 15, a ring-shaped plate B (outer diameter: 80)
mm, inner diameter: 68 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its inner circumference.
The signal generating member is provided by extending inward in the radial direction. An epoxy resin-based adhesive was applied to the ring-shaped plate B and the tooth profile C, and the epoxy resin-based adhesive was attached to a toothed pulley main body made of a preformed phenolic resin. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

Comparative Example 2 As shown in FIG. 16, a ring-shaped plate B (outer diameter: 52
mm, inner diameter: 40 mm), ring-shaped plate B with four tooth profiles C (width: 5 mm, length: 8 mm) at 90 ° intervals on its outer circumference.
The signal generating member is provided by being extended outward in the radial direction. An epoxy resin-based adhesive was applied to the ring-shaped plate B and the tooth profile C, and the epoxy resin-based adhesive was attached to a toothed pulley main body made of a preformed phenolic resin. Table 1 shows output values and manufacturing costs measured in the same manner as in Example 1.

[0020]

[Table 1]

The reason why the output values of Examples 1, 9, 10, and 11 are larger than the output value of Comparative Example 2 and the output value of Example 2 is larger than the output value of Comparative Example 1 is that Since the bent portion made of the material is provided extending to the tip of the tooth profile, this bent portion is also within the sensing range of the sensor when the tooth profile passes through the magnetic sensor, and the example is a comparative example. This is because the change in the magnetic flux is larger than that in. The output value of Example 3 is larger than the output value of Comparative Example 1, and
The output value of Example 6 is larger than the output value of Comparative Example 2 because the bent portion made of a magnetic material is provided so as to extend in the direction opposite to the tooth profile with the ring-shaped plate sandwiched therebetween. This is because the bent portion is also within the sensing range of the sensor when passing through the magnetic sensor, and the magnetic flux change is larger in the example than in the comparative example. The output value of Example 5 is larger than the output value of Comparative Example 1 and the output value of Example 8 is larger than the output value of Comparative Example 2 because the bent portion made of the magnetic material is changed from the tooth profile. Since it is provided by extending to one side in the circumferential direction of the ring-shaped plate,
This is because, when the tooth profile passes through the magnetic sensor, the bent portion is also within the sensing range of the sensor, and the magnetic flux change in the example is larger than that in the comparative example. The reason why the output value of the fifth embodiment is larger than that of the fourth embodiment and the output value of the eighth embodiment is larger than that of the seventh embodiment is that in the fifth and eighth embodiments, the bent portion has a tooth profile. This is because the ring-shaped plate is extended to one side in the circumferential direction, and the one side is the front side when viewed from the rotation direction of the toothed pulley. In Embodiments 4 and 7 in which the bent portions are provided on both sides of the toothed plate in the circumferential direction, when the tooth profile passes through the magnetic sensor, the magnetic sensor first senses the bent portion before the tooth profile. After that, the tooth profile will be sensed.
Therefore, in Examples 4 and 7, the change in magnetic flux is smaller than that in Examples 5 and 8 in which the bent portion is not provided on the tip side in the rotation direction.

[0022]

As described above, the toothed pulley made of a non-magnetic material according to the present invention has a toothed portion made of a magnetic material provided on a ring-shaped plate as a signal generating member, and is further bent to form a toothed portion. And the bent portion is insert-molded on the toothed pulley, the mounting is simple and the cost is low. Then, it is possible to prevent the noise waveform from appearing in the waveform detected by the magnetic sensor. When the bending part is provided extending from the tooth profile in the radial direction of the ring plate, and when the bending part is extended from the tooth profile to one side in the circumferential direction of the ring plate, the one side is provided from the rotation direction of the toothed pulley. When it is on the front side as viewed, the change in magnetic flux sensed by the magnetic sensor becomes large, and a high output waveform can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a toothed pulley according to a first exemplary embodiment of the invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in the first embodiment of the present invention.

FIG. 4 is an explanatory view of a main part showing a state in which the toothed pulley according to the first embodiment of the present invention is used in combination with a magnetic sensor.

FIG. 5 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in a second embodiment according to the present invention.

FIG. 6 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in a third embodiment according to the present invention.

FIG. 7 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in Example 4 of the present invention.

FIG. 8 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in Example 5 of the present invention.

FIG. 9 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in a sixth embodiment according to the present invention.

FIG. 10 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in Example 7 of the present invention.

FIG. 11 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in Example 8 of the present invention.

FIG. 12 is a sectional view of a toothed pulley according to a ninth embodiment of the present invention.

FIG. 13 is a sectional view of a toothed pulley according to a tenth embodiment of the invention.

FIG. 14 is a plan view of a ring-shaped plate (including a tooth profile and a bent portion) used in Example 11 of the present invention.

15 is a plan view of a ring-shaped plate (including a tooth profile) used in Comparative Example 1. FIG.

16 is a plan view of a ring-shaped plate (including a tooth profile) used in Comparative Example 2. FIG.

[Explanation of symbols]

 A is a toothed pulley B is a ring-shaped plate C is a tooth profile D is a bent part E is a magnetic sensor

Claims (5)

[Claims] 1. A tooth profile in which a ring-shaped plate made of a magnetic material is attached to a toothed pulley whose main body is made of a non-magnetic material, concentrically with a rotary shaft of the toothed pulley, and a signal-generating member is extended from the ring-shaped plate in its radial direction. In the one with
A toothed pulley having a structure in which a bent portion is provided on the tooth profile and the processed portion is embedded in the toothed pulley by insert molding. 2. The toothed pulley according to claim 1, wherein the bent portion is provided so as to extend from the tip of the tooth profile in the radial direction. 3. The toothed pulley according to claim 1, wherein the bent portion is provided so as to extend in a radial direction opposite to the tooth profile with the ring-shaped plate interposed therebetween. 4. The toothed pulley according to claim 1, wherein the bent portion is provided so as to extend from the tooth profile to both sides in the circumferential direction of the ring-shaped plate. 5. The bent portion is provided extending from the tooth profile to one side in the circumferential direction of the ring-shaped plate, and the one side is the front side when viewed from the rotation direction of the toothed pulley. The toothed pulley according to Item 1.