JPH06159480A - Toothed pulley - Google Patents

Abstract

PURPOSE:To enhance the detection output of a magnetic sensor in a toothed pulley having a body made of nonmagnetic materials, while using magnetic materials for a signal generating member for detecting a rotational speed, instead of magnets. CONSTITUTION:A toothed resin pulley 1 has a rib 2 having a surface in which a ring-like plate 3 made of a rolled steel plate for general structures is embedded, concentric with the rotary shaft of the toothed pulley 1 and flush with the surface of the rib 2. 24 of protrusions 4 are projected inward are formed on the ring-like plate 3, at equal intervals, and are similarly embedded so as to form a signal generating member for detecting a rotational speed. The protrusions 4 are formed, simultaneously with the stamping of the ring-like plate 3.

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. Then, the toothed pulley is provided with a function for detecting the rotation angle. If the main body is a toothed pulley made of non-magnetic material such as resin or aluminum die-cast, the main body of the signal generating member is to be equidistantly or at arbitrary intervals all around the circumference concentrically with the rotation axis to detect the rotation angle. A magnet or block of magnetic material (steel) is placed. If the main body is a sintered toothed pulley made of a magnetic material, the main body is provided with concavities and convexities that are signal generation members concentric with the rotation axis at equal intervals or at arbitrary intervals for detecting the rotation angle. ing. A magnetic sensor that detects the passage of the signal generating member while the toothed pulley is rotating is placed on the rotation trajectory of the signal generating member to measure the rotation angle, and the detection output from the magnetic sensor is used to ignite the internal combustion engine. It is used as a signal for timing or fuel injection timing.

[0003]

By the way, in the case of a toothed pulley whose main body is made of a non-magnetic material, the one in which the block of the above magnetic material (steel material) is arranged as a signal generating member uses a magnetic induction effect to generate a magnetic field. The output from the sensor is
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 converted into an ON / OFF control waveform by the control circuit, and when the ignition timing of the internal combustion engine or the fuel injection timing is taken, the output of the output of A low waveform may be cut 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. By changing the above, it is possible to obtain an output equal to or higher than the output obtained when using a sintered toothed pulley having irregularities without changing the specifications of the magnetic sensor. 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 the block of the magnetic material (steel material) as the signal generating member. The problem to be solved by the present invention is to increase the detection output of a magnetic sensor by using a magnetic material as a signal generating member for rotation detection in a toothed pulley whose main body is made of a non-magnetic material.

[0004]

In order to solve the above-mentioned problems, a toothed pulley according to the present invention comprises a ring-shaped plate made of a magnetic material, a body of the toothed pulley made of a non-magnetic material, and a rotary shaft thereof. Mount in concentric circles. Further, the ring-shaped plate is provided with one or a plurality of protrusions made of a magnetic material and protruding at an inner peripheral side of the ring and arranged at predetermined intervals. The toothed pulley according to the present invention is also provided with one or a plurality of protrusions made of a magnetic material and protruding at the outer peripheral side of the ring of the ring-shaped plate and arranged at predetermined intervals.

[0005]

In the toothed pulley according to the present invention, the magnetic sensor is installed on the rotation locus of the protrusion made of the magnetic material which is the signal generating member. In the configuration according to the present invention, a magnetic circuit is formed between the ring-shaped plate and the magnetic sensor, and the number of magnetic lines of force at this time is larger than that in the case where a block made of a magnetic material is arranged as a signal generating member, and thus the magnet is used. High output can be obtained without arranging the blocks.

[0006]

【Example】

Example 1 As shown in FIG. 1 (plan view) and FIG. 2 (cross-sectional view), a rolled steel plate for general structure is formed concentrically with the rotating shaft of the toothed pulley 1 on the surface of the rib 2 of the resin toothed pulley 1. A ring-shaped plate 3 (outer diameter: 80 mm, width: 4 mm, made of JIS G3101)
The thickness (1.0 mm) was embedded so as to be flush with the surface of the rib 2. The ring-shaped plate 3 is provided with 24 equally-spaced protrusions 4 (width: 5 mm, height: 8 mm, thickness: 1.0 mm) that project toward the inner peripheral side and are embedded in the same manner to detect the rotation angle. It was used as a signal generating member. The protrusions 4 are formed together when the ring-shaped plate 3 is punched. If the ring-shaped plate 3 and the projection 4 are integrated, they are easy to handle, and the workability of manufacturing the toothed pulley is much better than when the blocks are positioned and embedded one by one. As shown in FIG. 3, the magnetic sensor 5 is arranged at a position centered on the height of the protrusion 4 of the ring-shaped plate 3, and the rotation speed is 10
The toothed pulley was rotated at 0 rpm and the resulting output was measured. The output values obtained from this magnetic sensor are shown in Table 1.

Example 2 The same structure as in Example 1 was adopted except that the thickness of the ring-shaped plate and the protrusions was 1.6 mm and the material was mild steel plate. Table 1 shows the output values obtained from the magnetic sensor as in the first embodiment.

Embodiment 3 As shown in FIG. 4, a ring-shaped plate made of a general structural rolled steel plate (JIS G3101) concentrically with the rotating shaft of the toothed pulley 1 on the surface of the rib 2 of the resin toothed pulley 1. 3 '(outer diameter: 56 mm, width: 4 mm, thickness: 1.0 mm) was embedded so as to be flush with the surface of the rib 2. The ring-shaped plate 3'is provided with 24 equally-spaced protrusions 4 '(width: 5 mm, height: 8 mm, thickness: 1.0 mm) projecting to the outer peripheral side and similarly embedded and arranged to detect the rotation angle. It was used as a signal generating member. The protrusion 4'is formed together with the ring-shaped plate 3'when punching. Table 1 shows the output values obtained from the magnetic sensor as in the first embodiment.

Conventional Example 1 As shown in FIG. 5, a general structural rolling is carried out on the surface of the rib 2 of the resin toothed pulley 1 with a 60 mm diameter circle concentric with the rotating shaft of the toothed pulley 1 as the center line. Steel material (JIS G310
Twenty-four blocks 6 (width: 5 mm, height: 8 mm, thickness: 5 mm) consisting of 1) are arranged at equal intervals so as to be flush with the surface of the rib 2 to provide a rotation angle detection signal generating member. . Table 1 shows the output values obtained from the magnetic sensor as in the first embodiment.

Conventional Example 2 In Conventional Example 1, 24 blocks of BHmax 3.8 MGOe sintered magnets (width: 5 mm, height: 8 mm, thickness: 5 mm) were placed in place of the block 6. Table 1 shows the output values obtained from the magnetic sensor as in the first embodiment.

Reference Example A convex portion (width: 5 mm, height: 8 mm) is formed on the rib surface of a sintered toothed pulley with a 60 mm diameter circle concentric with the toothed pulley rotation axis as the center line. , Thickness: 5 mm) 24 at equal intervals
Individually formed into a rotation angle detection signal generating member. Table 1 shows the output values obtained from the magnetic sensor as in the first embodiment.

[0012]

[Table 1]

[0013]

As described above, the toothed pulley whose main body is made of a non-magnetic material according to the present invention can be obtained from a magnetic sensor even though a magnetic material is used as a signal generating member without using a magnet. The output can be as high as or higher than the output obtained when using a sintered toothed pulley. Further, as shown in Table 1, the cost based on the case where the magnet is used as the signal generating member (conventional example 2) can be kept low. Further, in the case of a sintered toothed pulley, there is no choice but to form unevenness on the surface of the toothed pulley main body as a signal generating member, but in the one according to the present invention, the surface of the signal generating member and the toothed pulley main body are The surfaces can be made to be the same surface, and in this case, the wind noise when the toothed pulley rotates can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a toothed pulley according to an embodiment of the present invention.

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

FIG. 3 is an explanatory diagram of a main part showing a state of detecting a signal from a protrusion that is a signal generating member using the toothed pulley according to the embodiment of the present invention.

FIG. 4 is a plan view of a toothed pulley according to another embodiment of the present invention.

FIG. 5 is a plan view of a conventional toothed pulley.

[Explanation of symbols]

 1 is a resin toothed pulley 2 is a rib 3 is a ring-shaped plate 4 is a protrusion 5 is a magnetic sensor

Claims (3)

[Claims] 1. A ring-shaped plate made of a magnetic material is attached to a main body of a toothed pulley made of a non-magnetic material concentrically with a rotation shaft of the toothed pulley, and the ring-shaped plate is made of a magnetic material protruding toward the inner peripheral side of the ring. A toothed pulley characterized in that one or a plurality of protrusions arranged at predetermined intervals are provided. 2. A ring-shaped plate made of a magnetic material is attached to a body of a toothed pulley made of a non-magnetic material concentrically with a rotation shaft of the toothed pulley, and the ring-shaped plate is made of a magnetic material protruding toward the outer peripheral side of the ring. A toothed pulley comprising one or a plurality of protrusions arranged at predetermined intervals. 3. The ring-shaped plate and the projection are attached so as not to project from the toothed pulley body surface.
The toothed pulley described in.