JP2007218862A - Rotation detection sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily determine a direction when the directivity of detecting a rotational direction is set in a rotation detection sensor P. <P>SOLUTION: This rotation detection sensor P for detecting the normal- or reverse-directional rotational direction and the rotational speed of a detected object B by magnetic field fluctuation caused by rotation of the detected object B has display b capable of determining which of the normal- or reverse-directional rotational direction is brought in the detected object B, when the rotation detection sensor is opposed to the detected object B. The normal- or reverse-direction is confirmed on its appearance in the rotation detection sensor by this manner, and the rotation detection sensor is easily installed thereby to make the direction directed to a required direction, for example, a normal rotational direction of a left wheel of a vehicle. The rotation detection sensor is thereby avoided from being attached with an erroneous rotation detection direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotation detection sensor such as an automobile wheel speed sensor and an engine speed sensor, and a method for manufacturing the same.

For example, in the wheel speed sensor, the detection part is mounted (provided) on a resin holder (bobbin), the holder is inserted into the covered cylindrical casing from the opening, and the detection part is mounted. A pair of relay terminals are connected to the lead piece, and the relay terminals are led out from the end face of the holder base and connected to the output cable, and the relay terminal and the output cable are extended over the entire circumference of the casing opening and the holder exposed part. Is embedded and resin-coated (see Patent Document 1).
JP 2002-257840 A

Further, as shown in FIG. 9, the detection unit a is not mounted on the casing, and the detection unit a is directly coated with the resin 4 or the output cable 6 is directly connected to the lead piece without using the relay terminal. There is also a thing (refer patent document 2).
JP 2003-57259 A

  As shown in FIG. 8A, the wheel speed sensor P includes an assembly of the detection part a (“detection part assembly” step in FIG. 8) and a processing / assembly of the output cable 6 (“cable part processing / assembly”). After the process (step) is performed in a separate process, the detection part a and the output cable 6 are connected (same "detection part / cable part connection" process), and the resin coating is performed ("resin molding (wheel speed Sensor formation) ”process), dimension inspection (the same“ dimension inspection ”process), and inspection whether the normal rotation detection output is performed (the“ electrical inspection (output inspection) ”process).

  As shown in FIG. 9, these wheel speed sensors P are provided facing the rotating detection target B, and a magnetic field variation due to the rotation of the detection target B is detected by the detection unit a and converted into an electric signal. The signal is transmitted to an external control device via the relay terminal, the output cable 6 and the like. The detected body B has a ferromagnetic pulsar ring provided with gear-like teeth at the peripheral edge, or a magnet magnetized so that S and N poles appear alternately and continuously on the peripheral surface. Pulsar ring is used.

In this type of wheel speed sensor P, a pair of rotation detection elements (a Hall element, a magnetoresistive element (MRE), etc.) are provided in parallel with the rotation direction of the detection object B in the detection unit a, and as shown in FIG. The output waveforms (pulses) W ₁ and W ₂ formed on the basis of signals from the pair of rotation detection elements due to the magnetic field fluctuations due to the rotation of the detection object B are shown as the forward rotation of the detection object B (the same figure). (A)) and reverse rotation ((b) in the figure) are made different (for example, the pulse width is made different), the rotation direction of the detection object B is detected by the difference in rising pulse, and the number of detected pulses is detected. Some devices detect the number of rotations (see Patent Document 3).
By detecting the rotational direction, for example, when the vehicle moves backward, it is possible to detect vehicle backward movement in a slope start assist system that applies a brake.
Japanese Patent Laid-Open No. 10-332725

When the wheel speed sensor P capable of detecting the rotation direction and the number of rotations is used as, for example, a wheel speed detection sensor of an ABS (anti-lock / brake system) of a vehicle, as shown in FIG. The wheel speed sensors P are respectively installed on the front and rear wheels of the vehicle to be connected to the control circuit C, and the respective wheel speed sensors P detect the rotation directions and the rotation speeds of the front, rear, left and right wheels. At this time, the rotation detection directions of the left and right wheel speed sensors P are reversed while facing the detection object B (the left wheel is forward clockwise and the right wheel is forward rotated counterclockwise).
In this case, if the direction of the detected forward / reverse rotation direction is set for each wheel speed sensor P, it is necessary to install the left and right wheel speed sensors P having different forward / reverse rotation directions to be detected.

If the installation position of the wheel speed sensor P is wrong, for example, if the wheel speed sensor P that should be installed on the left wheel is installed on the right wheel, the forward / reverse rotation detection direction is reversed and the accurate rotation direction of the wheel cannot be detected. It becomes.
However, the conventional wheel speed sensor P is not provided with means for indicating the detected forward / reverse rotation direction so that the detected forward / reverse rotation direction can be distinguished by quality control of the product number. An erroneous installation of the wheel speed sensor P has occurred. That is, for example, there has been a case where the wheel speed sensor P to be installed on the left wheel is installed on the right wheel.

  The first object of the present invention is to make it possible to easily determine the direction of the forward / reverse rotation direction when the direction of the forward / reverse rotation direction is set in the rotation detection sensor. A second problem is to ensure that the setting and the display indicating the direction match.

In order to achieve the first object, according to the present invention, when a rotation detection sensor capable of detecting the rotation direction and the number of rotations is opposed to the detection object, the rotation direction of the detection object is a forward / reverse rotation direction. It is assumed that the display has a display that can determine either of the above.
The rotation detection sensor capable of detecting the rotation direction and the number of rotations with the display is employed, for example, as a wheel speed sensor of a slope start assist system that applies a brake when the vehicle moves backward.

In order to achieve the second object, according to the present invention, when the rotation detection sensor having the display is manufactured, the rotation detection sensor detects the normal rotation of the rotation direction by switching the signal from the outside. When the forward / reverse rotation direction is set by switching the direction and the reverse rotation direction, the forward / reverse rotation direction is set by the signal switching, and then automatically linked with the forward / reverse rotation direction setting device. The above-mentioned display is applied.
In addition, when the forward / reverse rotation direction to be detected is determined by the rotation detection sensor, the forward / reverse rotation direction to be detected is automatically determined in conjunction with the forward / reverse rotation direction determination device. The above display is applied.
The “after setting” includes not only after the setting is completed but also the setting operation and “simultaneous”.

  According to the present invention, the display can confirm the forward / reverse rotation direction of the rotation detection sensor on the appearance, so that the rotation detection sensor is set so that the set detection forward / reverse rotation direction becomes the required detection direction, for example, For the right wheel of a vehicle, it can be easily installed so that its forward rotation detection direction is the right rotation direction (forward direction), and the forward / reverse rotation detection direction is not erroneously attached.

  In addition, when manufacturing the rotation detection sensor with the display, after setting the forward / reverse rotation direction, the display is automatically performed in conjunction with the setting device for the forward / reverse rotation direction, or the detected forward / reverse rotation is performed. After the direction is determined, the display is automatically performed in conjunction with the forward / reverse rotation direction determination device, so that the direction setting of the rotation detection sensor and the display indicating the direction are reliably matched. And there will be no display errors in that direction.

  As an embodiment of the present invention, in a rotation detection sensor that detects the forward / reverse rotation direction and the number of rotations of a detected object by a magnetic field variation caused by the rotation of the detected object, the detected object is detected when facing the detected object. It is possible to adopt a configuration having a display that can determine whether the body rotation direction is the forward or reverse rotation direction.

  The display may be a shape difference such as a protrusion, a depression, a notch, or a C-cut at a corner, or an arrow indicating a normal / reverse rotation direction or a character indicating a normal / reverse rotation direction.

This rotation detection sensor can be manufactured by the same manufacturing method as the conventional one. For example, in the case where the forward / reverse detection of the rotation direction can be switched by switching the signal from the outside, the detection is performed by switching the signal. After setting the rotation direction (forward / reverse rotation direction), the display is automatically performed in conjunction with the direction setting device.
In addition, when the forward / reverse rotation direction to be detected is determined (determined at the time of manufacture), after the forward / reverse rotation direction is determined (after the output detection of the rotation detection sensor), it is linked with the direction determination device. The above display is automatically performed.

  1 to 4 show a wheel speed sensor P according to this embodiment. The wheel speed sensor P of this embodiment has a detection unit a parallel to a Hall IC 11 having a pair of Hall elements (rotation detection elements) 11a and 11a for detecting magnetic field fluctuations. The lead piece 12 is led out and an electronic component 13 such as a capacitor is provided between the lead pieces 12 and 12. A flexible core wire (conductor) 6a of a pair of insulated wires of the output cable 6 is connected to the pair of lead pieces 12 by soldering or the like.

  As shown in FIGS. 3 and 4, the resin molded product holder 20 has a fitting recess 14 for the Hall IC 11 formed in the front part of one surface of the rectangular parallelepiped. An insertion hole 16 for the lead piece 12 is formed in the rear wall of the holder 20 (see FIGS. 2 and 4). The insertion of the lead piece 12 into the insertion hole 16 and the insertion of the lead piece 12 into the recess 14 of the Hall IC 11 are performed. By the fitting, the detection part a is reliably positioned and set (held) on the holder 20. In the figure, reference numeral 8 denotes a locking tool that fits the holder 20 after the detection part a is set in the holder 20, and when the locking tool 8 fits in the holder 20, the detection part a is securely attached to the holder 20. Hold.

As shown in FIG. 3, after the Hall IC 11 or the like is incorporated in the holder 20 and the flexible core 6a is connected to the lead piece 12, the Hall IC 11, the lead piece 12, the entire holder 20, the output cable 6, and the mounting bracket A rotation detection sensor P is obtained by embedding a part of 10 and performing resin coating 4 (FIGS. 1 and 2).
The resin coating 4 of the detection part a of the wheel speed sensor P is provided with an arrow b indicating the set forward rotation direction. The arrow b can be provided by various known means such as laser marking, ink spraying, and labeling.

When the arrow b is provided, in the rotation detection sensor P that sets the forward / reverse rotation direction by switching the forward / reverse rotation direction of the forward / reverse detection of the rotation direction by switching the signal from the outside, After the forward / reverse rotation direction is set by the signal switching, the arrow b is automatically applied by the laser marking or the like in conjunction with the forward / reverse rotation direction setting device.
For example, as shown in FIG. 8B, in the conventional manufacturing process shown in FIG. 8A, after the “resin molding” step, the forward / reverse rotation direction is set by signal switching (“rotation direction setting (external Electrical signal application) "process) is performed, and thereafter, the display of the arrow b (the" direction display (linked with the direction setting device) "process) is performed in conjunction with the setting of the forward / reverse rotation direction.
In addition, in the rotation detection sensor in which the normal / reverse rotation direction is opposed to the object to be detected, after detecting the normal / reverse rotation direction to be detected, the rotation detection sensor automatically operates in conjunction with the determination device for the normal / reverse rotation direction. In the same manner, the arrow b is applied.
For example, as shown in FIG. 8C, in the conventional manufacturing process, after the electrical inspection process after the “dimension inspection” process, the arrow b is displayed in conjunction with the electrical inspection (“direction display (direction determination Equipment (output inspection machine) ”)) process). At this time, the electric inspection machine usually has a direction discrimination function.

The wheel speed sensor P also outputs the output waveforms W ₁ and W ₂ of the Hall IC 11a due to the magnetic field fluctuations based on the rotation of the detected object B during normal rotation of the detected object B (FIG. 10A). ) And during reverse rotation ((b) in the figure), the number of rotations and the direction of rotation of the detection object B are detected.
For example, when the wheel speed sensor P is installed on the left and right wheels of the vehicle as shown in FIG. 5, the forward / reverse rotation detection direction indicated by the arrow b is reversed, for example, the right wheel side is the forward rotation direction and the left wheel side is Are prepared in accordance with the arrow b (see FIG. 5).
At this time, since the forward direction (forward direction) is indicated by the arrow b, the correspondence with the forward direction of the vehicle is obvious at a glance, and the effect of preventing setting mistakes in the detected forward / reverse rotational direction is great.

  The display b may be any display as long as it can determine which rotation direction of the detected object B is detected when facing the detected object B, for example, As shown in FIG. 6, “L” (the same figure (a)) or “R”, “dot” (the same figure (b)) indicating the installation on the left and right wheels of the vehicle, the color (partial) However, it is also possible to adopt a method such as (c) in FIG. “L” or “R” in FIG. 5A is obvious for the left wheel and the right wheel, and has a great effect of preventing an erroneous setting of the detected forward / reverse rotation direction. In the “dot” in FIG. 5B, the display b can be easily formed. The difference in color shown in FIG. 6C is used for various types of discrimination in the manufacturing site of this type of automobile industry, so that it is familiar and has an advantage that it can be distinguished even at a distance.

Moreover, it can be made to respond | correspond to installation of a left-right wheel by the change of a shape, for example, the wheel speed sensor P corresponding to a left wheel differs in the external shape of the resin coating 4 from the wheel speed sensor P corresponding to a right wheel. Make it an aspect. For example, as shown in FIG. 7, a protrusion b is provided (FIG. 7A), a recess b is provided (FIG. 7B), a notch b is provided (FIG. 7C), a corner Can be C-cut b (FIG. 4D).
Since the head shape of the wheel speed sensor P is different from the display b due to this shape change, it cannot be attached to the vehicle side (the side where the wheel speed sensor P is attached) unless the head shape is used. When the wheel speed sensor P for the left wheel is attached to the part, there is an advantage that erroneous assembly can be surely prevented by devising that there is an interfering object and cannot be attached.

  In the case of setting the forward / reverse rotation direction by these indications b, the setting may be made with reference to something such as the mounting bracket 10 or the like, and the direction indicated by the indication b is set as the forward rotation direction. For example, the mounting bracket 10 is generally a long piece as shown in FIG. 9A, and in the mounting state of the mounting bracket 10, the protruding direction of the mounting bracket 10 from the detection portion a (FIG. 9B ) In the direction opposite to the object B to be detected (see the same figure), if there is a display b on the right side (rightward), the rightward direction (clockwise direction) is set as the forward rotation direction (see FIG. 7 (a)-(d)).

In the embodiment, the casing 20 is not provided and the entire holder 20 is directly coated with the resin coating 4. However, the wheel speed sensor P in which the detection portion a is fitted in the casing and the resin coating 4 is used. Of course, the invention can be adopted.
In the embodiment, the display b indicating the forward rotation direction is used. However, the display b may indicate the reverse rotation direction. At this time, even if the display indicates the reverse rotation direction, it is clear that the reverse rotation direction of the display is the normal rotation direction. Therefore, the display indicating the reverse rotation direction is also a display indicating the normal rotation direction. .
Furthermore, although the embodiment is a wheel speed sensor, it is needless to say that the present invention can be applied to other rotation detection sensors having forward and reverse rotational directionality. The use location is not limited to a vehicle, and an appropriate location in an aircraft, various machine tools, or the like that needs to detect the rotation direction and the number of rotations can be selected.

Schematic plan view of one embodiment Cut front view The perspective view of the detection part of the same Example Exploded perspective view of the detector Schematic installation diagram of the vehicle in the embodiment Schematic plan view of other embodiments Schematic plan view of other embodiments It is a manufacturing-process figure of a wheel speed sensor, (a) is a prior art example, (b), (c) is each Example. It is the attachment general | schematic aspect figure of the wheel speed sensor, (a) is a left view, (b) is a front view. Output waveform diagram of the wheel speed sensor

Explanation of symbols

4 Resin coating 6 Output cable 11 Hall IC
11a Hall element (rotation detection element)
a Detection unit b Display P Wheel speed sensor B Object to be detected

Claims (5)

In the rotation detection sensor (P) for detecting the forward / reverse rotation direction and the rotational speed of the detected body (B) by the magnetic field fluctuation due to the rotation of the detected body (B),
A rotation detection sensor having a display (b) that can determine whether the rotation direction of the detection object (B) is a normal or reverse rotation direction when facing the detection object (B).   The rotation detection sensor according to claim 1, wherein the display (b) is caused by a difference in shape such as a protrusion, a depression, a notch, or a C-cut at a corner.   The rotation detection sensor according to claim 1, wherein the display (b) is an arrow indicating either the forward or reverse rotation direction or a character indicating either the forward or reverse rotation direction. A method of manufacturing a rotation detection sensor (P) for detecting a forward / reverse rotation direction and a rotation speed of a detected body (B) by a magnetic field variation caused by rotation of the detected body (B),
In the rotation detection sensor (P) for setting the forward / reverse rotation direction to be detected by switching the forward / reverse rotation direction of the forward / reverse detection of the rotational direction by switching the signal from the outside, the signal switching is performed. After the forward / reverse rotation direction is set by the above, when the rotation detection sensor (P) is automatically opposed to the detected body (B) in conjunction with a device for setting the forward / reverse rotation direction, A method of manufacturing a rotation detection sensor, characterized in that the rotation detection sensor (P) is provided with a display (b) that can determine whether the rotation direction of the detection body (B) is a forward or reverse rotation direction. A method of manufacturing a rotation detection sensor (P) for detecting a forward / reverse rotation direction and a rotation speed of a detected body (B) by a magnetic field variation caused by rotation of the detected body (B),
In the rotation detection sensor (P) in which the forward / reverse rotation direction to be detected is determined, after the forward / reverse rotation direction to be detected is determined, the rotation is automatically performed in conjunction with the forward / reverse rotation direction determination device. When the detection sensor (P) is made to face the detection object (B), the display (b) that can determine whether the rotation direction of the detection object (B) is the forward or reverse rotation direction is displayed on the rotation detection sensor (P ). A method for manufacturing a rotation detection sensor, wherein

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