JP2010066026A - Mounting method of rotation detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting method of a rotation detector for easily sharing the rotation detector among different targets to be mounted. <P>SOLUTION: In the mounting method of the rotation detector for detecting a rotation condition of a rotor 110 provided in an engine housing 120, the engine housing 120 has a closed-end magnet insertion hole 121 for fixing the position of a magnet 20 while the magnet 20 has been inserted, where the magnet 20 should be inserted to a position corresponding to the rotor 110. By inserting the magnet 20 into the magnet insertion hole 121 in the engine housing 120, and by inserting a sensor component 10 into the sensor insertion hole 21 in the magnet 20, the rotation detector is mounted to the engine housing 120. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for mounting a rotation detection device.

  Conventionally, there has been one disclosed in Patent Document 1 as an example of a rotation detection device.

A rotation detection device disclosed in Patent Document 1 includes a detection unit disposed on a detection target, a housing unit that supports the detection unit, and a bolt formed integrally with the housing unit and a housing of the detection target. It is comprised including the flange for fastening used for fastening by. Further, an O-ring is fitted in an annular groove formed in the middle of the housing portion. When the rotation detection device is mounted on the housing of the detected body, the sealing performance is secured and maintained by the close contact between the side wall of the mounting through-hole provided in the housing of the detected body and the O-ring. Will come to be.
JP 2006-308330 A

  As described above, in the rotation detection device disclosed in Patent Document 1, when the rotation detection device is mounted on the housing of the detection object, the rotation detection device is connected to the detection object from the mounting through-hole provided in the detection object housing. The housing part of the rotation detection device is exposed inside the housing.

  However, the thickness and shape of the housing of the object to be detected and the components inside the housing are different for each manufacturer and product. Therefore, in order to cope with the above-mentioned restrictions without widening the gap between the detection unit and the detection target that affect the accuracy of the rotation detection device, it is possible to share the rotation detection device between different mounting targets. It was difficult.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a method for mounting a rotation detection device that facilitates common use of rotation detection devices among different mounting targets.

  In order to achieve the above object, a method for mounting a rotation detection device according to claim 1 is a method for mounting a rotation detection device for detecting a rotation mode of a detected object provided in a housing, wherein the rotation detection device comprises: A magnet that generates a bias magnetic field, a magnetic detection element that outputs a signal corresponding to a change in the bias magnetic field accompanying the rotation of the detected object, a processing circuit that processes a detection signal from the magnetic detection element, and a processing circuit And a sensor component provided with a terminal for outputting the processed signal to the outside, and the housing is configured such that the magnet and the sensor component are inserted at a position corresponding to the detected object. It has a bottomed insertion hole that fixes the position of the magnet with the part inserted, and the rotation detector is mounted on the housing by inserting the magnet and sensor part into the insertion hole of the housing. It is characterized in that.

  In this way, the rotation detection device (magnet, sensor component) is not exposed inside the housing of the detected body by simply inserting the magnet and sensor component into the bottomed insertion hole provided in the housing of the detected body. Can be mounted on a housing. Moreover, even if the thickness and shape of the housing of the object to be detected are different, if the depth of the insertion hole is adequately provided, only the rotation detection device (magnet, sensor component) is inserted into the insertion hole. Thus, the rotation detecting device (magnet, sensor component) can be mounted on the housing of the detected object without widening the gap with the detected object. Therefore, according to the first aspect, the rotation detection device can be easily shared between different mounting targets.

  In addition, as shown in claim 2, the magnet is a sensor part to be inserted, and the magnet has a sensor insertion hole for fixing the position of the sensor part in a state where the sensor part is inserted, The rotation detection device may be mounted on the housing by inserting a magnet into the insertion hole of the housing and inserting a sensor component into the sensor insertion hole of the magnet.

  Further, as shown in claim 3, the insertion hole of the housing may have a shape equivalent to the shape of the magnet.

  By doing in this way, the position of a magnet can be fixed in the state where the magnet was inserted.

  Moreover, as shown in claim 4, the sensor insertion hole may have a shape equivalent to the shape of the sensor component.

  By doing so, the position of the sensor component can be fixed in a state where the sensor component is inserted.

  Further, as shown in claim 5, after the rotation detection device is mounted on the housing, the characteristics of the rotation detection device may be adjusted.

  By doing so, it is possible to perform characteristic adjustment using an actual detected object, so that the adjustment accuracy can be improved as compared with the case where an inspection target object is used.

  According to a sixth aspect of the present invention, the housing may be a housing of an internal combustion engine, and the detected body may be a crank rotor provided on the crankshaft. That is, the rotation detection device can be applied to a device that detects a crank rotation mode in an internal combustion engine.

  Since the rotation detecting device mounting method of the present invention is to insert a magnet and a sensor component into a bottomed insertion hole provided in the housing of the detected object, the magnet and the sensor component are placed in the housing of the detected object. There is no exposure. That is, it is preferable because the environment for mounting the rotation detection device (magnet, sensor component) can be relaxed.

  Therefore, as shown in claim 6, even when the rotation detection device is applied to a device that detects the rotation mode of the crank in the internal combustion engine, the rotation detection device (magnet, sensor component) is exposed in the internal combustion engine. Therefore, it is preferable to be mounted in a poor environment such as being exposed to oil or being placed in a high temperature environment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a rotation detection device according to an embodiment of the present invention. 2A and 2B are diagrams showing a schematic configuration of the magnetic sensor chip in the embodiment of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a cross-sectional view. 3A and 3B are diagrams showing a schematic configuration of the magnet according to the embodiment of the present invention, in which FIG. 3A is a top view and FIG. 3B is a side view. FIGS. 4A to 4C are diagrams for explaining a method of mounting the rotation detection device according to the embodiment of the present invention.

  The rotation detection device in the present embodiment will be described using an example applied to, for example, an apparatus that detects the rotation angle of a crankshaft of an in-vehicle internal combustion engine (hereinafter also referred to as an engine).

  The rotation detection device includes a sensor component 10, a magnet 20, a connector 30, and the like. As shown in FIG. 2, the sensor component 10 (mold IC) includes, for example, a magnetic sensor chip 13 in which a pair of magnetoresistive elements as magnetic detection elements are integrated with a processing circuit, and the magnetic sensor chip 13 includes The terminal 12 (for example, copper lead frame) mounted via the adhesive member 14 is provided. That is, the magnetic sensor chip 13 is mounted on an island of a lead frame composed of a terminal 12 that is a terminal portion, an island formed of a flat portion, and a tie bar that holds the island. For example, an epoxy-based conductive material containing Ag powder is used. It is fixed by an adhesive member (Ag paste) 14. Further, the terminal 12 of the lead frame and the electrode on the magnetic sensor chip 13 are connected by wire bonding. The magnetic sensor chip 13 and the terminal 12 (lead frame) are integrally molded with the molding resin 11.

  The magnet 20 is a permanent magnet that generates a bias magnetic field, and is a columnar member that includes a sensor insertion hole 21 that is a through hole, as shown in FIG. The sensor component 10 is inserted into the sensor insertion hole 21. The sensor insertion hole 21 fixes the position of the sensor component 10 in a state where the sensor component 10 is inserted. For example, the sensor insertion hole 21 has a shape equivalent to the shape of the sensor component 10 to be inserted (the shape of the mold resin 11). It is a thing. Accordingly, the sensor component 10 and the magnet 20 are positioned in a state where the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20. Therefore, the assembly accuracy (position accuracy) between the sensor component 10 and the magnet 20 can be improved.

  The connector 30 includes a cord 31 that electrically connects the sensor component 10 and the outside in order to output a detection signal from the sensor component 10. For example, a connector with leads that is directly connected to the sensor component 10 can be employed. The connector 30 can be fixed to a magnet insertion hole 121 of the engine housing 120 described later, and is electrically connected to the terminal 12 side exposed from the mold resin 11 of the sensor component 10 and fixed to the magnet insertion hole 121. It has a waterproof structure in the state. Therefore, water or the like is prevented from entering the magnet insertion hole 121 from the outside of the engine housing 120.

  Next, a part related to rotation detection of the engine 100 on which the rotation detection device is mounted and a method of mounting the rotation detection device in the present embodiment will be described with reference to FIGS. FIG. 4 is a view of the engine housing 120 as viewed from the direction of the opening of the magnet insertion hole 121.

  As shown in FIGS. 1 and 4A, the engine housing 120 includes a magnet insertion hole (insertion hole) 121 at a position corresponding to the rotor 110 that is a detection target. The rotor 110 is provided on the crankshaft and has a gear shape.

  The magnet insertion hole 121 is a hole with a bottom for fixing the position of the magnet 20 in a state where the magnet 20 is inserted and the magnet 20 is inserted. For example, it has a shape equivalent to the shape of the magnet 20 to be inserted. In addition, since the magnet insertion hole 121 is provided by performing cutting etc. with respect to the engine housing 120, a shape and a dimension can be provided with high precision. Therefore, the mounting accuracy of the sensor component 10 and the magnet 20 on the engine housing 120 can be improved.

  In the rotation detection device, the detection accuracy depends on the gap between the sensor component 10 (magnetic detection element) and the rotor 110. Therefore, the position of the magnet insertion hole 121, the thickness of the bottom surface of the magnet insertion hole 121, and the interval from the magnet insertion hole 121 to the rotor 110 are appropriately designed. Therefore, the sensor component 10, the magnet 20, and the rotor 110 are positioned in a state where the magnet 20 is inserted into the magnet insertion hole 121 and the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20. Further, for example, the sensor component 10, the magnet 20, and the rotor 110 may be positioned in a state where the sensor component 10 and the magnet 20 hit the bottom surface of the magnet insertion hole 121.

  When the rotation detection device is mounted on such an engine 100 (engine housing 120), first, the magnet 20 is inserted into the magnet insertion hole 121 of the engine housing 120 as shown in FIG. For example, the magnet 20 is inserted until it hits the bottom surface of the magnet insertion hole 121. The magnet insertion hole 121 has a shape equivalent to the shape of the magnet 20 and fixes the position of the magnet 20 in a state where the magnet 20 is inserted. Therefore, the magnet 20 and the rotor 110 can be positioned without the magnet 20 being displaced from the engine housing 120.

  Next, the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20 until it contacts the bottom surface of the magnet insertion hole 121 as shown in FIG. The sensor insertion hole 21 has a shape equivalent to the shape of the sensor component 10 and fixes the position of the sensor component 10 in a state where the sensor component 10 is inserted. Therefore, the sensor component 10 and the magnet 20, and the sensor component 10 and the rotor 110 can be positioned without the sensor component 10 being displaced with respect to the magnet 20 and the engine housing 120. In this way, the rotation detection device is mounted on the engine housing 120 of the engine 100. In other words, the rotation detection device mounting method in the present embodiment is to mount the rotation detection device (magnet 20 and sensor component 10) directly on the engine housing 120 (magnet insertion hole 121).

  As described above, the magnet 20 is inserted into the bottomed magnet insertion hole 121 provided in the engine housing 120 and the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20. The sensor component 10) can be mounted on the engine housing 120 without being exposed inside the engine housing 120. Even if the thickness and shape of the engine housing 120 are different, the rotation detection device (magnet 20, sensor component 10) is inserted into the magnet insertion hole 121 as long as the magnet insertion hole 121 is appropriately provided. The rotation detection device (the magnet 20 and the sensor component 10) can be mounted on the engine housing 120 without widening the gap with the rotor 110 simply by inserting. Therefore, the rotation detection device (the magnet 20 and the sensor component 10) can be easily shared between different mounting targets. Further, by sharing the rotation detection device (magnet 20 and sensor component 10) among different mounting targets, the rotation detection device (magnet 20 and sensor component 10) can be made inexpensive (product unit price can be reduced). .

  Usually, the shape of the engine housing differs depending on the manufacturer and product. In the case of a rotation detection device in which a sensor component and a magnet are integrally formed with a mold as in the prior art, it is necessary to make the shape different for each manufacturer or product. Therefore, it is necessary to ensure reliability (confirm durability) in each of the rotation detectors having different shapes. On the other hand, in the present embodiment, since the rotation detection device can be easily shared between different mounting targets as described above, individual durability performance confirmation becomes unnecessary by sharing the rotation detection device.

  Further, although the conventional magnet 20 and sensor component 10 are covered with the mold resin, they are mounted in a poor (harsh) environment such as being exposed to oil through the mold resin or being placed in a high temperature environment. It was. On the other hand, in the present embodiment, the rotation detection device (magnet 20, sensor component 10) can be mounted on the engine housing 120 without being exposed inside the engine housing 120. It is preferable because it is not mounted in a poor (harsh) environment such as being placed in a high temperature environment. That is, the mounting environment of the rotation detection device (the magnet 20 and the sensor component 10) can be relaxed. Accordingly, it is possible to suppress endurance fluctuations in an inferior (harsh) environment, and it is not necessary to have high environmental resistance compared to the conventional one, so that the rotation detecting device can be made inexpensive (product unit price can be reduced). ).

  Conventionally, a rotation detection device in which a sensor part and a magnet are integrally formed by a mold is attached to a housing of a detection object (rotor) with a bolt. There was a possibility of deviation. Further, there is a possibility that a deviation occurs even when the bolt is closed. On the other hand, in the present embodiment, the sensor component 10, the magnet 20, and the rotor 110 are positioned in a state where the magnet 20 in the magnet insertion hole 121 is inserted and the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20. Therefore, mounting accuracy (position accuracy) can be improved. By improving the mounting accuracy in this way, the detection system of the rotation detection device can also be improved.

  In the present embodiment, the magnet 20 is inserted into the bottomed magnet insertion hole 121 provided in the engine housing 120, and the sensor component 10 is inserted into the sensor insertion hole 21 of the magnet 20. The magnet 20 and the sensor component 10 are not exposed in the engine housing 120. That is, it is preferable because the mounting environment of the rotation detection device (the magnet 20 and the sensor component 10) can be relaxed.

  Further, after the rotation detection device (magnet 20, sensor component 10) is mounted on the engine housing 120, the characteristics of the rotation detection device (magnet 20, sensor component 10) may be adjusted. By doing in this way, since characteristic adjustment can be performed using the actual rotor 110, adjustment accuracy can be improved compared with the case where an inspection rotor is used.

  In the present embodiment, the columnar member magnet 20 provided with the sensor insertion hole 21 has been described. However, the present invention is not limited to this. For example, a plate-like magnet can be employed. In this case, the insertion hole provided in the engine housing 120 has a shape that allows the magnet 20 and the sensor component 10 to be positioned (positioned) when the magnet 20 and the sensor component 10 are inserted.

It is sectional drawing which shows schematic structure of the rotation detection apparatus in embodiment of this invention. It is a figure which shows schematic structure of the magnetic sensor chip in embodiment of this invention, (a) is a top view, (b) is a side view, (c) is sectional drawing. It is a figure which shows schematic structure of the magnet in embodiment of this invention, (a) is a top view, (b) is a side view. (A)-(c) is a figure for demonstrating the mounting method of the rotation detection apparatus in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sensor component, 11 Mold resin, 12 Terminal, 13 Magnetic sensor chip (Magnetic detection element, processing circuit), 14 Adhesive member, 20 Magnet, 21 Sensor insertion hole, 30 Connector, 31 Code, 100 Engine (internal combustion engine), 110 Rotor (detected body), 120 engine housing, 121 magnet insertion hole

Claims (6)

A method of mounting a rotation detection device for detecting a rotation mode of a detection object provided in a housing,
The rotation detection device includes:
A magnet for generating a bias magnetic field;
A magnetic detection element that outputs a signal corresponding to a change in the bias magnetic field accompanying the rotation of the detected object, a processing circuit that processes the detection signal from the magnetic detection element, and a signal processed by the processing circuit to the outside And a sensor component provided with a terminal for output,
The housing is configured to insert the magnet and the sensor component at a position corresponding to the object to be detected, and to fix the position of the magnet with the magnet and the sensor component inserted. Has an insertion hole,
A method for mounting a rotation detection device, wherein the rotation detection device is mounted on the housing by inserting the magnet and the sensor component into an insertion hole of the housing.   The magnet is inserted with the sensor component, and has a sensor insertion hole for fixing the position of the sensor component in a state where the sensor component is inserted, and is inserted into the insertion hole of the housing. The method for mounting a rotation detection device according to claim 1, wherein the rotation detection device is mounted on a housing by inserting the magnet and inserting the sensor component into a sensor insertion hole of the magnet.   The method for mounting a rotation detection device according to claim 2, wherein the insertion hole of the housing has a shape equivalent to the shape of the magnet.   The method for mounting a rotation detection device according to claim 2, wherein the sensor insertion hole has a shape equivalent to a shape of the sensor component.   The method for mounting a rotation detection device according to claim 1, wherein characteristics adjustment of the rotation detection device is performed after the rotation detection device is mounted on the housing.   6. The method for mounting a rotation detection device according to claim 1, wherein the housing is a housing of an internal combustion engine, and the detected body is a crank rotor provided on a crankshaft. .

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