JP6704441B2 - Rotation detector - Google Patents

Description

The present invention relates to an improved rotation detection device.

For example, a rotation detection device is provided near the axle of the front wheels of a motorcycle. The vehicle speed of the two-wheeled vehicle can be measured from the rotation speed of the front wheels detected by the rotation detection device. As a conventional technique related to such a rotation detecting device, there is a technique disclosed in Patent Document 1.

In the rotation detecting device as shown in Patent Document 1, a magnetic detection element and a magnet are arranged at the bottom of a bottomed cylindrical case, and resin is filled in the case to attach the magnetic detection element and the magnet. It is embedded in the case.

Parts such as the magnetic detection element are fixed in the case by a filled resin. It is possible to prevent the components such as the magnetic detection element from being displaced in the case due to the influence of vibration, and to improve the detection accuracy.

However, according to such a rotation detecting device, it is necessary to cure the filled resin, and the work for manufacturing the rotation detecting device takes a long time.

JP, 2008-164439, A

An object of the present invention is to provide a rotation detection device that can be manufactured in a short time.

According to the present invention according to claim 1, a magnetic detection element for detecting a magnetic change caused by rotation of a rotating body, a magnet for applying a magnetic field to the magnetic detection element, and a lead terminal connected to the magnetic detection element. A rotation detecting device having a housing in which the magnetic detecting element, the magnet, and the lead terminal are housed,
The magnetic detection element, the magnet, and the detection means holding portion in which the lead terminal is arranged, the seal member provided on the outer periphery of the detection means holding portion, the connection portion connectable to the external connector, and the mounting collar are first color insertion portion is inserted, a first housing having,
A second housing fitted to the first housing and having a bottomed cylindrical rotor facing portion;
The second housing further has a second collar insertion portion through which the mounting collar is inserted,
A rotation detecting device, wherein the first housing and the second housing sandwich the seal member in a state in which the first color insertion portion and the second collar insertion portion are fitted to each other. Provided.

According to the invention of claim 2, a locking claw is formed on one of the first housing and the second housing, and a locking hole for locking the locking claw is formed on the other side. ing.

According to the invention according to claim 3, further comprising an intermediate case attached to the detection means holding portion and protruding toward the second housing,
The magnetic detection element, the magnet, and the lead terminal are attached to the middle case.

According to the invention of claim 4, in the second collar insertion portion of the second housing, at least the peripheral wall portion along the outer periphery of the collar is formed in an arc shape.

In the invention according to claim 1, the magnetic detection element, the magnet, and the lead terminal are provided with the seal member on the outer periphery of the detection means holding portion provided in the first housing, and the color insertion of the first housing and the second housing. The seal member is sandwiched with the parts fitted together. Since the seal member is sandwiched with the color insertion portions (41a, 51d) fitted together when the first housing and the second housing are fitted together, displacement due to vibration can be suppressed. In order to suppress the displacement of parts such as the magnetic detection element, it is not necessary to fill the resin. For this reason, it is possible to provide a rotation detection device that can be manufactured in a short time without requiring time to cure the resin.

In the invention according to claim 2, since the locking hole and the locking claw are formed in the first and second housings, the fitted state can be maintained and the handleability is improved.

In the invention according to claim 3, since the detecting means holding portion has the middle case projecting toward the second housing, the detecting means holding portion can be made smaller by that amount.

In the invention according to claim 4, since the color fitting portion of the second housing is formed in an arc shape along at least the peripheral wall portion of the color, fitting can be facilitated.

3 is a perspective view of a rotation detection device according to an exemplary embodiment of the present invention. FIG. FIG. 3 is an exploded perspective view of the rotation detection device shown in FIG. 1. FIG. 3 is an exploded sectional view of the rotation detecting device shown in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. 1. FIG. 5 is a view taken in the direction of arrows 5a and 5b of FIG. 2. FIG. 6 is a sectional view taken along line 6-6 of FIG. 4. It is a figure explaining the example of a change of the middle case fitting part shown by FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left and right refer to left and right with reference to the drawings, and upper and lower refer to upper and lower with reference to the drawings.
<Example>

Please refer to FIG. The rotation detection device 10 is provided, for example, in the vicinity of the front wheel axle of the two-wheeled vehicle. The vehicle speed of the two-wheeled vehicle can be measured from the rotation speed of the front wheels detected by the rotation detection device 10. The upper part of the center of the drawing is attached to the vehicle body, and the right part of the drawing is connected to the external connector. The part on the left side of the drawing is arranged to face the axle.

Please refer to FIG. In the rotation detection device 10, a magnetic detection element 11 that detects a magnetic change, a magnet 12 that applies a magnetic field to the magnetic detection element 11, and a lead terminal 13 that is connected to the magnetic detection element 11 are attached to the middle case 20. It is housed in the housing 30. The housing 30 is provided with a seal member 17 for suppressing the entry of water into the housing 30.

Please refer to FIG. A cylindrical collar 18 is attached to the housing 30. The collar 18 is a portion through which a bolt is inserted when the rotation detecting device 10 is attached to a vehicle body or the like.

The housing 30 includes a first housing 40 and a second housing 50 that is fitted into the first housing 40 and that is arranged to face the rotating body. Both the first housing 40 and the second housing 50 are resin molded products. As the material, any resin such as polybutylene terephthalate resin can be adopted.

Please refer to FIG. The magnetic detection element 11 includes a detection element body 11a arranged adjacent to the magnet 12 and an element-side contact portion 11b extending downward from a lower portion of the detection element body 11a and in contact with the lead terminals 13 and 13. , 11b. The element-side contact portions 11b and 11b are formed in two places according to the number of lead terminals 13 and 13.

Please also refer to FIG. The lead terminals 13 and 13 have a substantially L shape. The lead terminals 13, 13 are terminal main bodies 13a, 13a extending along the lower surface of the middle case 20, and terminal ends that extend downward from one end of the terminal main bodies 13a, 13a and are in contact with the element side contact portions 11b, 11b. And contact portions 13b and 13b. Each of the terminal body portions 13a, 13a is formed with two terminal hole portions 13c for fixing to the middle case 20.

The middle case 20 includes a case body 21 that houses the magnetic detection element 11 and the magnet 12, case ribs 22 and 22 formed on the left and right side surfaces of the case body 21 to reinforce the case body 21, and a case body. A case contact portion 23 extending from the tip of the portion 21 toward the first housing 40 and having the tip abutting the first housing 40, and a case extending downward from the lower surface of the case body portion 21 and inserted into the terminal hole portion 13c. And pin portions 24, 24. The case pin portions 24, 24 are formed integrally with the case main body portion 21.

As the material of the middle case 20, any resin such as polybutylene terephthalate resin can be adopted.

The first housing 40 is surrounded by the first housing bottom plate portion 41, the first housing peripheral wall portion 42 extending from the entire circumference of the first housing bottom plate portion 41 toward the second housing 50, and the first housing peripheral wall portion 42. The middle case fitting portion 43 (detection means holding portion 43) extending from the first housing bottom plate portion 41 toward the second housing 50 at the broken portion and the first housing bottom plate portion 41 can be connected to an external connector. And a connecting portion 44.

The second housing 50 includes a second housing base portion 51, which is covered with the first housing bottom plate portion 41 and the first housing peripheral wall portion 42, and a cylindrical second portion integrally formed with the second housing base portion 51. It is composed of a housing middle portion 52 and a bottomed cylindrical rotor facing portion 53 integrally formed with the second housing middle portion 52.

In the first housing bottom plate portion 41, the first collar insertion hole 41a (the collar insertion portion 41a) in which the collar 18 is inserted and the middle case fitting portion 43 and the connection portion 44 are communicated, and the lead terminal 13 is inserted. And a terminal insertion hole 41b which is formed.

The first housing peripheral wall portion 42 is formed with four locking holes 42a at which the second housing 50 is locked.

The middle case fitting portion 43 is connected to the connecting portion 44 with the first housing bottom plate portion 41 interposed therebetween. That is, the middle case fitting portion 43 and the connecting portion 44 are provided at the same position with respect to the first housing bottom plate portion 41. The middle case fitting portion 43 extends from the first housing bottom plate portion 41 toward the second housing 50, and the connection portion 44 extends so as to be separated from the second housing 50 starting from the first housing bottom plate portion 41.

A housing hole Ho for housing the middle case 20 is formed continuously with the second housing base portion 51, the second housing intermediate portion 52, and the rotating body facing portion 53. The outer wall of the housing hole Ho can be referred to as a peripheral wall that surrounds the middle case 20.

A portion of the peripheral wall formed on the second housing base portion 51 can be referred to as a base peripheral wall portion 51a. The base portion peripheral wall portion 51a is formed in a circular shape along the outer surface of the cylindrical middle case fitting portion 43. The second housing base portion 51 is formed with a groove portion 51b surrounding the base portion peripheral wall portion 51a. The groove portion 51b is formed between the peripheral wall portion of the color insertion hole 51d (color insertion portion 51d) and the base peripheral wall portion 51a so as to face the first housing 40 (first housing bottom plate portion 41).

In the second housing base portion 51, a locking claw 51c that is locked in the locking hole 42a of the first housing 40, a second collar insertion hole 51d (color insertion portion 51d) in which the collar 18 is inserted, and , Are formed.

The seal member 17 may be an O-ring made of acrylic rubber or silicone rubber.

The middle case fitting portion 43 may be formed on the second housing 50. Further, the middle case fitting portion 43 may be formed in both the first housing 40 and the second housing 50.

The locking claw 51c may be provided in the first housing 40. At this time, the locking hole 42a is provided in the second housing 50.

An example of an assembling method of the rotation detecting device will be described. First, the magnetic detection element 11 and the magnet 12 are housed in the middle case body 21, and the lead terminals 13 are fixed to the lower surface of the middle case body 21. The lead terminal 13 is welded to the middle case body portion 21 after inserting the terminal hole portion 13c into the case pin portion 24.

Next, the seal member 17 is attached to the outer periphery of the middle case fitting portion 43.

Next, the assembly in which the magnetic detection element 11, the magnet 12, and the lead terminal 13 are assembled to the middle case 20 is pushed into the middle case fitting portion 43 and fitted therein. By being fitted into the middle case fitting portion 43, the tip of the lead terminal 13 faces the inside of the connecting portion 44.

Next, the second housing 50 is assembled to the first housing 40 by pushing the locking claw 51c into the locking hole 42a.

Finally, the collar 18 is inserted into the first and second collar insertion holes 41a and 51d (color insertion portions 41a and 51d).

The seal member 17 and the collar 18 can be assembled at any timing.

The rotation detection device of the present invention described above has the following effects.

Please refer to FIG. The middle case 20 to which the magnetic detection element 11, the magnet 12, and the lead terminal 13 are attached is fitted to a middle case fitting portion 43 provided in the first housing 40. Parts such as the magnetic detection element 11 are fixed to the middle case fitting portion 43 via the middle case 20. Thereby, displacement due to vibration can be suppressed. In order to suppress the displacement of parts such as the magnetic detection element 11, it is not necessary to fill the resin. Therefore, it is possible to provide the rotation detection device 10 that can be manufactured in a short time without requiring time to cure the resin.

Further, the seal member 17 is attached to the outer periphery of the tubular middle case fitting portion 43, and the seal member 17 is sandwiched between the first housing 40 and the second housing 50. Water can be prevented from entering from the outside to the inside on the outer periphery of the middle case fitting portion 43, and the life of the rotation detection device 10 can be extended.

Further, the second housing 50 is covered with the first housing bottom plate portion 41 and the first housing peripheral wall portion 42 in which the second housing peripheral wall portion 54 is formed. When the water existing outside the rotation detecting device 10 enters the inside of the housing 30, the water passes between the first housing peripheral wall portion 42 and the second housing 50, and the first housing bottom plate portion 41 and the second housing. It is also necessary to pass between 50. The presence of the first housing peripheral wall portion 42 increases the length to the inside of the housing 30. As a result, it is possible to prevent water from entering the inside of the housing 30 and to extend the life of the rotation detection device 10.

Further, a base portion peripheral wall portion 51a is formed along the outer periphery of the middle case fitting portion 43 in the second housing 50, and a groove portion 51b is formed so as to surround the base portion peripheral wall portion 51a. The base portion peripheral wall portion 51a sandwiches the seal member 17 together with the middle case fitting portion 43. The groove portion 51b is formed on the outer periphery of the seal member 17. The groove 51b can prevent water from entering the housing 30. Water can be prevented from entering the inside of the housing 30, and the life of the rotation detection device 10 can be extended.

Please refer to FIG. A locking claw 51c is provided in the second housing 50, and a locking hole 42a capable of locking the locking claw 51c is provided in the first housing 40. It is possible to simplify the assembly of the second housing 50 into the first housing 40 and further reduce the manufacturing time of the rotation detection device 10.

Reference is made to FIG. The middle case 20 has a case body 21 to which the magnetic detection element 11 is attached, and case ribs 22 and 22 which are formed integrally with the case body 21 and reinforce the case body 21. There is. The width of the middle case 20 is L1.

Reference is made to FIG. The middle case fitting portion 43 has a cylindrical shape. The inner diameter of the middle case fitting portion 43 is L2.

Please also refer to FIG. At this time, the width L1 of the middle case 20≈the inner diameter L2 of the middle case fitting portion 43, and the inner diameter L2 of the middle case fitting portion 43 is slightly larger. Therefore, the case rib portions 22 and 22 come into contact with the inner peripheral surface of the middle case fitting portion 43.

Please refer to FIG. The case rib portions 22 and 22 are in contact with the inner peripheral surface of the middle case fitting portion 43. The case rib portions 22, 22 contact the middle case fitting portion 43 to suppress the displacement of the middle case 20 inside the housing 30. Displacement of the middle case 20 is suppressed by the case rib portions 22 and 22 for reinforcing the case body portion 21. It is desirable that the displacement of the middle case 20 can be suppressed with a small number of parts and a simple structure.

Please refer to FIG. 7A and FIG. 7B. FIG. 7 shows a modification of the middle case fitting part shown in FIG. The case rib portions 22 and 22 are integrally formed on the left and right side surfaces of the case body portion 21 and have a rectangular parallelepiped shape. The middle case fitting portion 43A has a protruding portion 43a protruding toward the case rib portions 22 and 22 and having a tip end abutting against the case rib portions 22 and 22. The protruding portion 43a is in contact with the upper and lower surfaces of the left and right case rib portions 22, 22 and the outer surface thereof. The displacement of the middle case 20 can be more surely suppressed by abutting on a large number of parts.

The protruding portion 43a has a substantially V shape (a substantially triangular shape) before the middle case 20 is fitted into the middle case fitting portion 43A. The strength of the protruding portion 43a is weaker than the strength of the case rib portions 22 and 22. Therefore, when the middle case 20 is fitted into the middle case fitting portion 43A, the tip of the protruding portion 43a is deformed by the case rib portions 22 and 22. That is, the projecting portion 43a is in elastically deformed contact with the case rib portions 22 and 22. As a result, the projecting portion 43a is reliably brought into contact with the case rib portions 22, 22. In addition, it is possible to absorb the dimensional error that necessarily occurs for each product.

Although the rotation detection device according to the present invention has been described based on an example used for the front wheels of a two-wheeled vehicle, it may be used for the rear wheels, and the present invention is not limited to these types. That is, the present invention is not limited to the examples as long as the actions and effects of the present invention are exhibited.

The rotation detection device of the present invention is suitable for detecting the traveling speed of a two-wheeled vehicle.

DESCRIPTION OF SYMBOLS 10... Rotation detection device 11... Magnetic detection element 12... Magnet 13... Lead terminal 17... Sealing member 18... Collar 20... Middle case 30... Housing 40... 1st housing 41... 1st housing bottom plate part 41a... Collar insertion part (No. (1 through hole)
42... 1st housing peripheral wall part 42a... Locking hole 43... Middle case fitting part 44... Connection part 50... 2nd housing 51c... Locking claw 51d... Collar insertion part (2nd collar insertion hole)

Claims (4)

A magnetic detection element that detects a magnetic change caused by rotation of a rotating body, a magnet that applies a magnetic field to the magnetic detection element, a lead terminal connected to the magnetic detection element, the magnetic detection element, the magnet, and And a housing in which the lead terminal is housed,
The magnetic detection element, the magnet, and the detection means holding portion in which the lead terminal is arranged, the seal member provided on the outer periphery of the detection means holding portion, the connection portion connectable to the external connector, and the mounting collar are first color insertion portion is inserted, a first housing having,
A second housing fitted to the first housing and having a bottomed cylindrical rotor facing portion;
The second housing further has a second collar insertion portion through which the mounting collar is inserted,
The rotation detecting device, wherein the seal member is sandwiched by the first housing and the second housing in a state where the first collar insertion portion and the second collar insertion portion are fitted to each other. The locking claw is formed on one of the first housing and the second housing, and the locking hole for locking the locking claw is formed on the other side. The rotation detection device according to 1. Further comprising an inner case attached to the detection means holding portion and protruding toward the second housing,
The rotation detection device according to claim 1 or 2, wherein the magnetic detection element, the magnet, and the lead terminal are attached to the middle case. The said 2nd collar insertion part of the said 2nd housing WHEREIN: At least the peripheral wall part which follows the outer periphery of the said collar is formed in circular arc shape, The any one of Claim 1- Claim 3 characterized by the above-mentioned. Rotation detection device.

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