JP2000304759A - Rotation detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely arrange a body to be detected at a rotating body with no fear of slipping off or protruding from the rotating body, in a rotation detecting device which detects the rotation of a rotating body such as fly wheel, etc. SOLUTION: In the rotation detect device, a sensor 13 is provided away from the outer periphery of a rotating body 11 by a specified distance, and the sensor 13 detects an object 21 which is to be detected and arranged at the periphery of the rotating body 11, an annular recessed part 17 is formed along the outer perimeter of the rotating body 11, a hole part 19 is so formed as to cross the annular recessed part 17 from one side of the rotating body 11, and an object to detected 21 is inserted in the hole part 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detector for detecting rotation of a rotating body such as a flywheel.

[0002]

2. Description of the Related Art Conventionally, in an engine of an automobile, rotation of a flywheel is detected by a rotation detecting device to indirectly detect rotation of the engine. FIG.
1 shows a conventional rotation detecting device. In this rotation detecting device, a magnetic sensor 2 is arranged at a predetermined interval from the outer periphery of a flywheel 1 which is a rotating body.

[0003] The rotation of the flywheel 1 is detected by detecting a hole 3 formed in the outer periphery of the flywheel 1 by the magnetic sensor 2. However,
In such a rotation detecting device, since the hole 3 is detected, there is a problem that a pulse-like output signal from the magnetic sensor 2 is low and noise due to a scratch on the surface of the flywheel 1 is easily picked up. Was.

In view of the above, as shown in FIG. 5, a rotation detecting device has been conventionally developed in which a hole 4 is formed on the outer periphery of a flywheel 1 and a pin member 5 as an object to be detected is fitted and fixed in the hole 4. Have been. In such a rotation detecting device, since a protrusion of the pin member 5 from the flywheel 1 is detected, a high output signal can be obtained from the magnetic sensor 2.

[0005]

However, in such a conventional rotation detecting device, since the flywheel 1 rotates at high speed, there is a problem that the pin member 5 may come off from the hole 4 due to centrifugal force. Was. Further, since the pin member 5 protrudes from the outer periphery of the flywheel 1,
There is a problem that the pin member 5 may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and it is possible to easily and surely arrange an object to be detected without fear of falling out of the object to be rotated and protruding from the object of rotation. It is an object of the present invention to provide a rotation detection device that can perform the rotation detection.

[0007]

According to a first aspect of the present invention, there is provided a rotation detecting device, wherein a sensor is arranged at a predetermined distance from the outer periphery of the rotating body, and the object to be detected arranged on the outer periphery of the rotating body is detected by the sensor. In the rotation detecting device for detecting, while forming an annular recess along the outer periphery of the rotating body, forming a hole across the annular recess from one side of the rotating body,
The object to be detected is inserted into the hole.

According to a second aspect of the present invention, there is provided a rotation detecting device, wherein a sensor is arranged at a predetermined distance from an outer periphery of the rotating body, and the sensor detects an object to be detected arranged on the outer periphery of the rotating body. Forming an annular recess along the outer periphery of the rotating body, arranging the object to be detected in the annular recess, forming a hole from one surface side of the rotating body across the annular recess, And a support member to be inserted into the object to be detected.

According to a third aspect of the present invention, in the rotation detecting device according to the first or second aspect, the rotating body is a flywheel of an engine, and the hole is formed in the one surface side of the rotating body. And a ring gear is disposed to cover the ring gear.

(Function) In the rotation detecting device of the first aspect, the annular concave portion is formed along the outer periphery of the rotating body, and a hole is formed from one surface side of the rotating body across the annular concave portion.

Then, the object to be detected is fitted into the hole, and the object to be detected is projected in the annular concave portion. In the rotation detecting device according to the second aspect, the annular recess is formed along the outer periphery of the rotating body, and a hole is formed from one surface side of the rotating body across the annular recess. Then, the detection member is supported in the annular concave portion by inserting the support member inserted into the hole into the detected member arranged in the annular concave portion.

According to the third aspect of the present invention, the ring gear disposed to cover the hole prevents the object to be detected or the support member from coming off.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show a first embodiment of the rotation detecting device according to the present invention. In this embodiment, the present invention is applied to an engine flywheel. FIG.
In FIG. 2 and FIG. 2, reference numeral 11 denotes a rotating body composed of a flywheel. At a predetermined interval from the outer periphery of the rotating body 11, for example, a sensor 1 composed of a magnetic sensor
3 are arranged.

That is, a cover member 15 is disposed outside the rotating body 11, and the sensor 13 is fixed to the cover member 15. Along the outer circumference of the rotating body 11,
An annular recess 17 having a rectangular cross section is formed. And
The hole 1 extends across the annular recess 17 from one side of the rotating body 11.
9 are formed.

In this embodiment, the hole 19 has a circular shape, and as shown in FIG.
a has a semicircular groove 19 corresponding to a half of the hole 19;
a is formed. Then, the detection object 21 is inserted into the hole 19.
Is inserted. The detection target 21 has a columnar shape, and is formed of iron, a magnet, or the like.

Although not shown, a plurality of holes 19 are formed at a predetermined angle from the center of the rotating body 11.
An object to be detected 21 is inserted into each of the holes 19.
A small-diameter portion 23 is formed on one surface side of the rotating body 11, and a ring gear 25 is arranged on the small-diameter portion 23. The ring gear 25 has a small-diameter portion 2 by shrink fitting.
It is fixed to 3.

In the above-described rotation detecting device, after the detection target 21 is inserted into the hole 19 of the rotation
Is assembled by shrink fitting to the small diameter portion 23. In the rotation detecting device configured as described above, the annular concave portion 17 is formed along the outer periphery of the rotating body 11,
A hole 19 is formed across the annular concave portion 17 from one surface side, and the object 21 to be detected is inserted into the hole 19, so that the possibility that the object 21 is removed from the rotating body 11 due to centrifugal force is reliably eliminated. can do.

Further, the annular concave portion 1 is formed from one side of the rotating body 11.
Since the to-be-detected body 21 is inserted into the hole 19 formed across the cross-section 7, the to-be-detected body 21 does not protrude from the rotating body 11. Therefore, the possibility that the detection target 21 is damaged can be reduced. Further, in the rotation detection device described above, the ring gear 25 disposed so as to cover the hole 19 can reliably prevent the detection target 21 from coming off.

FIG. 3 shows a second embodiment of the rotation detecting device according to the present invention. In this embodiment, a hole 19A crosses substantially the center of an annular concave portion 17A formed on the outer periphery of the rotating body 11. Are formed. That is, in this embodiment, the hole 19A is formed at a distance from the bottom surface 17a of the annular recess 17A.

A roller-shaped detection object 21A is arranged in the annular recess 17A. A through hole 21a is formed in the detection target 21A in the axial length direction, and the support member 27 is inserted into the through hole 21a. The support member 27 has a rod shape and is inserted into the hole 19A. In the second embodiment, an annular recess 17A is formed along the outer periphery of the rotating body 11 and the annular recess 1A is formed.
Since the object 21A to be detected is disposed at 7A, a hole 19A is formed across the annular recess 17A from one surface side of the rotating body 11, and the support member 27 inserted into the hole 19A is inserted through the object 21A. The object to be detected 21A is rotated by the centrifugal force.
It is possible to reliably eliminate the risk of slipping out of the vehicle.

Further, since the detection target 21A is disposed in the annular concave portion 17A, the detection target 21A does not protrude from the rotating body 11. Further, since the detection target 21A is disposed outside the support member 27, the gap between the detection target 21A and the sensor 13 can be reduced, and the output of the sensor 13 can be increased.

In the above embodiment, an example in which the present invention is applied to a flywheel of an engine has been described. However, the present invention is not limited to such an embodiment. It can be widely applied to detection and the like.

[0024]

As described above, in the rotation detecting device according to the first aspect, an annular recess is formed along the outer periphery of the rotating body, and a hole is formed from one side of the rotating body across the annular recess. Since the object to be detected is inserted into this hole, the possibility that the object to be detected comes off the rotating body due to centrifugal force can be reliably eliminated.

Further, since the object to be detected is fitted into a hole formed from one side of the rotating body across the annular concave portion, the object to be detected does not protrude from the rotating body. In the rotation detecting device according to the second aspect, an annular concave portion is formed along the outer periphery of the rotating body, and a detection target is disposed in the annular concave portion, and a hole is formed from one surface side of the rotating body across the annular concave portion. Since the support member inserted into the hole is inserted through the detection object, the possibility that the detection object comes off the rotating body due to centrifugal force can be reliably eliminated.

Further, since the object to be detected is arranged in the annular concave portion, the object to be detected does not protrude from the rotating body. Further, since the object to be detected is arranged outside the support member, the gap between the object to be detected and the sensor can be reduced, and the output of the sensor can be increased. In the rotation detecting device according to the third aspect, the ring gear is disposed so as to cover the hole.
It is possible to reliably prevent the object to be detected or the support member from coming off.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a first embodiment of a rotation detecting device according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view showing a main part of a second embodiment of the rotation detecting device of the present invention.

FIG. 4 is a cross-sectional view illustrating an example of a conventional rotation detection device.

FIG. 5 is a sectional view showing another example of the conventional rotation detecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotating body 13 Sensor 17, 17A Annular concave part 19, 19A Hole part 21, 21A Detected body 25 Ring gear 27 Support member

Claims (3)

[Claims] 1. A rotation detecting device for arranging a sensor at a predetermined interval from an outer periphery of a rotating body and detecting an object to be detected arranged on the outer periphery of the rotating body by the sensor. A rotation detecting device, wherein an annular concave portion is formed along the rotating body, a hole is formed across the annular concave portion from one surface side of the rotating body, and the object to be detected is inserted into the hole. 2. A rotation detecting device, wherein a sensor is arranged at a predetermined interval from an outer periphery of the rotating body, and the sensor detects an object to be detected arranged on the outer periphery of the rotating body. Along with forming an annular recess, the object to be detected is arranged in the annular recess, a hole is formed across the annular recess from one surface side of the rotating body, and a support member inserted into the hole is formed. A rotation detection device, wherein the rotation detection device is inserted through the detection target. 3. The rotation detecting device according to claim 1, wherein the rotating body is a flywheel of an engine, and a ring gear is disposed on the one surface side of the rotating body so as to cover the hole. A rotation detecting device characterized by being performed.