JP2017083231A - Rotation detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detector capable of simplifying manufacturing processes.SOLUTION: A rotation detector 100 comprises: a columnar holder 3 for housing a magnet 1 and a magnetic detection means 2; a hollow housing mounted on the holder 3 to cover an outer periphery of the holder 3; a storage part 31 provided on a tip of the holder 3 and storing the magnetic detection means 2; a pair of lead pieces 2a that are connected to the magnetic detection means 2 in the storage part 31, and extend from the tip of the holder 3 toward a base end part of the holder 3 so as to abut on a side surface 3c of the holder 3; a side surface support part 5 provided on the side surface 3c of the holder 3, in contact with outside surfaces of the pair of lead pieces 2a, and for preventing the pair of lead pieces 2a from opening outward; a base part provided between the pair of lead pieces 2a on the side face 3c of the holder 3, and in contact with an inside surface of each of the pair of lead pieces 2a; and a welding pin 6 that is connected to the base part and has an umbrella part 6b for sandwiching the pair of lead pieces 2a with the side surface 3c of the holder 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotation detection device.

For example, Patent Document 1 discloses a rotation detection device that detects the wheel speed and engine rotation of an automobile or a motorcycle.
In this rotation detection device, a sensor element serving as a magnetic detection means is installed on the flat surface of the holder, a pair of lead pieces extending rearward are temporarily fixed to the holder by heat caulking, and the lead piece and the cord are connected. After the connection, they are molded so as to be embedded in the housing.
Further, in the rotation detection device disclosed in Patent Document 2, a sensor element serving as magnetic detection means is attached to a holder, and a lead piece of the sensor element is locked and temporarily fixed to a claw formed on the holder. After the cords are connected to each other via a relay lead, they are molded so as to be embedded in the housing.

JP 2004-251629 A JP 2007-101204 A

  In the rotation detection devices disclosed in these Patent Documents 1 and 2, by temporarily fixing the lead piece of the sensor element serving as the magnetic detection means to the holder with heat caulking or claw, it is molded so as to be embedded in the housing, The malfunction and disconnection due to vibration of the sensor element are prevented. For this reason, there exists a problem of increase in a manufacturing process, such as mold forming and resin curing time.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotation detection device that can simplify the manufacturing process.

In order to achieve the above object, a rotation detection device according to the present invention includes:
A columnar holder in which the magnet and the magnetic detection means are stored;
A rotation detection device comprising a hollow housing attached to the holder so as to cover an outer periphery of the holder,
A storage portion provided at a tip portion of the holder and storing the magnetic detection means;
A pair of lead pieces coupled to the magnetic detection means in the storage portion and extending from the distal end portion of the holder toward the proximal end portion side of the holder so as to contact the side surface of the holder;
A side surface support portion provided on the side surface of the holder to prevent the pair of lead pieces from opening to the outside by contacting an outer surface of the pair of lead pieces;
A base portion provided between the pair of lead pieces on the side surface of the holder and abutting against an inner side surface of each lead piece; and an umbrella connected to the base portion and sandwiching the pair of lead pieces together with the side surface of the holder A welding pin including a portion,
It is characterized by that.

  According to the present invention, the manufacturing process can be simplified.

It is a front view which shows one Embodiment of the rotation detection apparatus of this invention. It is AA sectional drawing in FIG. 1 of one embodiment of this invention. It is the disassembled perspective view which abbreviate | omitted the housing of one embodiment of this invention. It is a perspective view of a relay lead and a cord of one embodiment of the present invention. It is a front view before welding of the welding pin which abbreviate | omitted the housing of one embodiment of this invention. It is BB sectional drawing in FIG. 5 of one embodiment of this invention. It is the front view after the welding of the welding pin which abbreviate | omitted the housing of one embodiment of this invention. It is CC sectional drawing in FIG. 7 of one embodiment of this invention. It is DD sectional drawing in FIG. 7 of one embodiment of this invention. It is the elements on larger scale of FIG. 9 of one embodiment of this invention.

Hereinafter, a rotation detection device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the rotation detection device 100 of the present invention is attached to the holder 3 so as to cover the outer periphery of the columnar holder 3 in which the magnet 1 and the magnetic detection means 2 are housed, and the holder 3. A rotation detecting device 100 comprising a hollow housing 4,
Provided at the distal end portion of the holder 3 and connected to the storage portion 31 for storing the magnetic detection means 2 and the magnetic detection means 2 in the storage portion 31, and from the distal end portion of the holder 3 to the proximal end portion side of the holder 3 A pair of lead pieces 2a extending toward the side surface 3c of the holder 3 and a side surface 3c of the holder 3 and contacting the outer side surfaces of the pair of lead pieces 2a, so that the outside of the pair of lead pieces 2a 9a and 10b, a base portion 6a that is provided between the side support portion 5 that prevents the opening and the pair of lead pieces 2a on the side surface 3c of the holder 3 and contacts the inner side surface of each lead piece 2a. And a welding pin 6 that is connected to the base portion 6a and includes an umbrella portion 6b that sandwiches the pair of lead pieces 2a together with the side surface 3c of the holder 3.

The rotation detection device 100 according to the present embodiment is used, for example, for detection of wheel speed of an automobile or detection of engine rotation.
The magnet 1 is made of, for example, SmCo (Samarium-Cobalt) and has a cylindrical shape.
The magnetic detection means 2 includes, for example, a Hall IC or a magnetoresistive element (MR element) incorporated in a synthetic resin sensor housing, and is disposed in front of the magnet 1 to detect a change in magnetism generated by the magnet 1. Is. The magnetic detection means 2 includes a noise absorbing capacitor, a signal amplification circuit, and the like built in the sensor housing, and a pair of plate-like lead pieces 2a are led out from the magnetic detection means 2 by bending them into a substantially L shape. Yes. In the present embodiment, a Hall IC is used as the magnetic detection means 2, and a change in magnetic force is converted into a voltage, which is used as a current output.

The holder 3 has a columnar shape made of, for example, PBT resin (Polybutylene Terephthalate). For example, as shown in FIG. 3, the holder 3 is integrally formed on the main body portion 3 a having a substantially rectangular parallelepiped shape and on the base end side of the main body portion 3 a. And a substantially cylindrical connector portion 3b larger than the main body portion 3a. The main body portion 3a has, for example, a shape in which two opposing side surfaces of a cylindrical body are flat surfaces and two side surfaces orthogonal to the cylindrical surfaces remain arc surfaces.
As will be described later, the holder 3 is provided with a pair of lead pieces 2a of the magnetic detection means 2 on a flat side surface (side surface disposed on the upper side in the drawing) 3c formed in the main body 3a.
As shown in FIGS. 2, 3, and 6, the holder 3 is provided with a storage portion 31 for storing the magnet 1 and the magnetic detection means 2 at the tip portion, and is formed in a concave shape with the side surface 3c side opened. The storage unit 31 includes a first storage unit 31 a that stores the magnetic detection unit 2 on the distal end side, and a second storage unit 31 b that stores the magnet 1 disposed behind the magnetic detection unit 2.
In these storage portions 31, concave first storage portions 31a and second storage portions 31b are formed small in accordance with the shapes and dimensions of the magnet 1 and the magnetic detection means 2.
Thereby, the magnet 1 and the magnetic detection means 2 are held in a state in which pressure is applied by the first storage part 31a and the second storage part 31b (press-fit state).
In the press-fitted state, the magnet 1 and the magnetic detection means 2 are held in a state where no external force stress is generated.
The holder 3 is provided with a pair of plate-like relay leads 7 made of a conductive material made of brass from the distal end portion to the base end portion, and a pair of plate-like lead pieces 2 a of the magnetic detection means 2. It is connected to the cord 8 through the relay lead 7.

As shown in FIG. 4, the relay lead 7 includes a first terminal portion 7 a on the tip end side connected to the pair of lead pieces 2 a of the magnetic detection means 2, and a second terminal portion 7 b connected to the cord 8. The power supply line to the magnetic detection means 2 and the output line from the magnetic detection means 2 are configured as a pair.
A cord 8 made of a two-wire cabtyre cable is connected to the second terminal portion 7b of the relay lead 7 by solder.
As shown in FIGS. 3, 5, and 7, the cord 8 to which the relay lead 7 is connected is embedded in the connector portion 3 b of the holder 3 to be in an airtight state by insert molding. The airtight state between the cord 8 and the connector portion 3b of the holder 3 is, for example, a cross-linked body of a resin composition mainly composed of a thermoplastic polyester elastomer in which the holder 3 is made of PBT resin and the sheath material of the cord 8 is made flame-retardant. Thus, the cord 8 is obtained by bonding the holder 3 by insert molding.

The relay lead 7 is highly bent so that the first terminal portion 7a on the distal end side is exposed to the side surface 3c of the holder 3, and as shown in FIG. 8, the distal end portion 7c is bent into an L shape. Is embedded in the main body 3 a of the holder 3. The flat and lowered proximal end portion other than the first terminal portion 7 a of the relay lead 7 is embedded in the main body portion 3 a and the connector portion 3 b of the holder 3.
As a result, the bent lead 7c of the relay lead 7 is embedded in the main body 3a of the holder 3, and the relay lead 7 is insert-molded into the holder 3, so that the brass relay lead 7 and the resin holder 3 Due to the difference in expansion and contraction due to the difference in thermal expansion, the connection location (welding location) between the pair of lead pieces 2a of the magnetic detection means 2 connected to the first terminal portion 7a of the relay lead 7 is prevented from being disconnected. .
In addition, such a structure of the relay lead 7 and the holder 3 can prevent disconnection or the like, and the holder 3 so far can be attached to the housing 4 by combining with the fixing of the lead piece 2a by the welding pin 6 described later. Eliminates the need for mold molding (outsert molding) with resin for storage.

As shown in FIGS. 2, 3, 6, etc., the magnetic detection means 2 is held in a press-fitted state in a storage portion 31 formed on the tip surface (a surface orthogonal to the side surface 3 c) of the holder 3, and is L-shaped The pair of lead pieces 2 a that are bent in the direction are extended from the distal end portion toward the proximal end portion side so as to contact the side surface 3 c of the holder 3. And the edge part of a pair of lead piece 2a is arrange | positioned so that it may be located on the 1st terminal part 7a of the relay lead 7 embed | buried under the holder 3, as shown in FIG.
The pair of lead pieces 2a is disposed in a mounting groove 3d formed in the holder 3, as shown in FIGS. On the inner side surface of the mounting groove 3d, a side surface support portion 5 is formed as a protruding portion 5a that protrudes inward so as to be in contact with the outer surface of the pair of lead pieces 2a. It is set.
Accordingly, the pair of lead pieces 2a is prevented from opening outward by bringing the outer side surfaces of the pair of lead pieces 2a into contact with the protruding portions 5a of the side surface support portions 5.
Further, as shown in FIGS. 9 and 10, a welding pin 6 is provided on the holder 3 between the pair of lead pieces 2a, and the base 6a of the welding pin 6 is abutted against the inner surface of each lead piece 2a. In contact with the base portion 6a, the umbrella portion 6b is heated and melted so that the upper surface of each lead piece 2a is held by the melted and hardened umbrella portion 6b and the lead piece 2a is sandwiched between the holder 3 and the holder 3. Secure with.
As a result, the pair of lead pieces 2 a are both abutted against the protrusions 5 a of the side surface support portion 5, and both the insides abut against the base portion 6 a of the welding pin 6. By being restrained between the umbrella part 6b and the holder 3, it fixes in the state which restrained up and down, right and left (refer FIG. 9, 10).
It is preferable that the lead piece 2a is fixed by the welding pin 6 at a position adjacent to the storage portion 31 of the magnetic detection means 2, that is, close to the bent portion of the pair of lead pieces 2a. The pair of lead pieces 2a can be restrained and fixed while avoiding the influence of vibration of the means 2 and the influence of the difference in thermal expansion.
In addition, the side surface support portion 5 that prevents the pair of lead pieces 2a from being pushed outward by pressing the outer surface is not limited to the case of the protrusion portion 5a formed inside the mounting groove 3d, but the mounting groove 3d. You may make it contact a side surface. Further, in the case where the projection portion 5a is used, the cross-sectional shape thereof may be a rectangle or a circle, and the number thereof may be one or more, and the outside of the pair of lead pieces 2a. What is necessary is just to prevent the opening to the outside of the side surface.

  The pair of lead pieces 2a of the magnetic detection means 2 fixed in this way are overlapped with the first terminal portion 7a of the relay lead 7 fixed to the holder 3 by insert molding and are electrically connected by resistance welding.

The housing 4 is made of, for example, PBT resin, and is formed in a hollow shape that is attached to the holder 3 so as to cover the outer periphery of the holder 3 as shown in FIGS. The housing 4 is formed in a bottomed cylindrical shape in which two cylindrical portions 4a and 4b to which the main body portion 3a and the connector portion 3b of the holder 3 can be attached are connected. In the housing 4, the main body 3a of the holder 3 is accommodated in a small diameter cylindrical portion 4a, and the connector portion 3b of the holder 3 is accommodated in an airtight state in a large diameter cylindrical portion 4b. The housing 4 is housed and disposed so that the magnetic detection means 2 at the tip of the holder 3 faces the bottom surface portion 4c, and the bottom surface portion 4c of the housing 4 constitutes a rotation detection surface.
The housing 4 and the holder 3 are recessed portions in which a packing member 9 such as an O-ring is interposed between the large-diameter cylindrical portion 4b of the housing 4 and the connector portion 3b of the holder 3, and the housing 4 and the holder 3 are engaged with each other. And are fixed by engaging portions 10 provided at a plurality of locations constituted by convex portions.
In the rotation detection device 100 of the present invention, the resin composition is not filled between the housing 4 and the holder 3 or the conventional mold forming for outsert molding of the housing 4 with respect to the holder 3 is not performed. The manufacturing process has been simplified.

  According to the rotation detection device 100 of the present embodiment, the magnetic detection means 2 is stored and held in a state in which pressure is applied to the storage portion 31 of the holder 3 (press-fit state), and the pair of lead pieces 2a are stored. In the vicinity of the bent portion adjacent to the portion 31, both outer sides abut against the protrusions 5 a of the side support portion 5 and both inner sides abut against the base portion 6 a of the welding pin 6. By being restrained between the part 6b and the holder 3, it is fixed in a state where the top and bottom and the left and right are restrained, so that malfunction and disconnection due to vibration can be suppressed. Thereby, it is not necessary to fill the resin composition between the housing 4 and the holder 3 or to perform mold forming for outsert molding of the housing 4 with respect to the holder 3, thereby simplifying the manufacturing process.

Further, according to the rotation detection device 100 of the present invention, the columnar holder 3 in which the magnet 1 and the magnetic detection means 2 are accommodated, and the hollow shape that is attached to the holder 3 so as to cover the outer periphery of the holder 3. A rotation detection device 100 comprising a housing 4,
Provided at the distal end portion of the holder 3 and connected to the storage portion 31 for storing the magnetic detection means 2 and the magnetic detection means 2 in the storage portion 31, and from the distal end portion of the holder 3 to the proximal end portion side of the holder 3 A pair of lead pieces 2a extending toward the side surface 3c of the holder 3 and a side surface 3c of the holder 3 and contacting the outer side surfaces of the pair of lead pieces 2a, so that the outside of the pair of lead pieces 2a A pair of lead pieces 2a on the side surface 3c of the holder 3 and the side surface 3c of the holder 3, which is provided between the pair of lead pieces 2a, abuts against the inner surface of each lead piece 2a, and is connected to the base portion 6a, Since the welding pin 6 includes an umbrella portion 6 b that sandwiches the lead piece 2 a together with the side surface 3 c of the holder 3, the magnetic detection means 2 is accommodated in the accommodation portion 31 at the distal end portion of the holder 3. 1 pair of lead pieces 2 The both outer sides abut on the side support portion 5 and both inner sides abut on the base portion 6a of the welding pin 6 and are restrained, and the upper and lower sides are restrained between the umbrella portion 6b of the welding pin 6 and the holder 3. Thus, since it is fixed in a state where the upper and lower sides and the left and right sides are constrained, malfunction and disconnection due to vibration can be suppressed.
Thereby, it is not necessary to fill the resin composition between the housing 4 and the holder 3 or to perform mold forming for outsert molding of the housing 4 with respect to the holder 3, thereby simplifying the manufacturing process.

  According to the rotation detection device 100 of the present invention, the first storage portion 31a is configured by a recess having a shape smaller than the magnetic detection means 2, and the magnetic detection means 2 is in a state where pressure is applied by the first storage portion 31a. Since it is held in the storage portion 31, it is possible to prevent malfunction due to vibration and to suppress the influence of thermal expansion on the base end side of the pair of lead pieces 2a, thereby preventing disconnection and the like. can do.

  According to the rotation detection device 100 of the present invention, since the welding pin 6 is positioned adjacent to the storage portion 31, the magnetic detection means 2 is securely connected to the welding pin 6 via the pair of lead pieces 2a. It can be fixed, and transmission of vibration from the magnetic detection means 2 can also be prevented.

  According to the rotation detection device 100 of the present invention, the holder 3 includes a pair of relay leads 7 that connect the pair of lead pieces 2a and the cord 8 drawn to the outside, and the pair of relay leads 7 has a tip portion 7c. Since it is configured to be bent and embedded in the side surface 3c, a pair of lead pieces of the magnetic detection means 2 connected to the relay lead 7 due to the difference in expansion and contraction due to the thermal expansion difference between the relay lead 7 and the holder 3 The connection location with 2a can be prevented from being disconnected.

In the above embodiment, the airtight structure between the holder 3 and the cord 8 and the airtight structure between the holder 3 and the housing 4 have been described by way of example. However, the present invention is not limited to these airtight structures, and other airtight structures are also described. It is good also as a structure.
The present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 100 Rotation detection apparatus 1 Magnet 2 Magnetic detection means 2a Lead piece 3 Holder 3a Main body part 3b Connector part 3c Side surface 3d Mounting groove 31 Storage part 31a First storage part 31b Second storage part 4 Housing 4a Small diameter cylindrical part 4b Large diameter cylindrical part 4b Cylindrical part 4c Bottom face part 5 Side support part 5a Projection part 6 Welding pin 6a Base part 6b Umbrella part 7 Relay lead 7a First terminal part 7b Second terminal part 7c Tip part 8 Cord 9 Packing member 10 Engagement part

Claims (4)

A columnar holder in which the magnet and the magnetic detection means are stored;
A rotation detection device comprising a hollow housing attached to the holder so as to cover an outer periphery of the holder,
A storage portion provided at a tip portion of the holder and storing the magnetic detection means;
A pair of lead pieces coupled to the magnetic detection means in the storage portion and extending from the distal end portion of the holder toward the proximal end portion side of the holder so as to contact the side surface of the holder;
A side surface support portion provided on the side surface of the holder to prevent the pair of lead pieces from opening to the outside by contacting an outer surface of the pair of lead pieces;
A base portion provided between the pair of lead pieces on the side surface of the holder and abutting against an inner side surface of each lead piece; and an umbrella connected to the base portion and sandwiching the pair of lead pieces together with the side surface of the holder A welding pin including a portion,
A rotation detection device characterized by that. The storage portion is constituted by a concave portion having a shape smaller than the magnetic detection means,
The magnetic detection means is held in the storage portion in a state where pressure is applied by the storage portion.
The rotation detection device according to claim 1. The welding pin is located adjacent to the storage portion;
The rotation detection device according to claim 1, wherein the rotation detection device is a rotation detection device. The holder includes a pair of relay leads that connect the pair of lead pieces and a cord drawn to the outside,
The pair of relay leads are configured such that tip portions are bent and embedded in the side surfaces.
The rotation detection device according to any one of claims 1 to 3.

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