JP2001264347A - Rotation detection sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detection sensor for improved reliability in water-proof and contact of a pair of terminals even under a severe environment. SOLUTION: A rotation detection sensor 10 is provided where a rotation detection element 14 is assembled to a sensor main body 11 through a pair of terminals 12, and the rotation detection elements 14 and parts of the pair of terminals 12 except for each base end 12a are housed in a case 15 to cover the sensor 10 with the case 15. Each base end 12a of the pair of terminals 12 is allowed to protrude outside from a bottom surface 11d in a cylindrical hood 11c which is formed at the sensor main body 11. Here, each core wire 17a of a pair of lead wires 17 is connected to each base end 12a of the pair of terminals 12 exposed above the hood 11c, while each base end 12a of the pair of terminals 12 and 12 as well as each core wire 17a of the pair of lead wires 17 is allowed to be covered with a water-proof cap 18 which penetrates the pair of lead wires 17 to engages with the hood part 11c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting sensor such as a semiconductor pickup sensor for detecting rotation of a gear used for an engine or a transmission of an automobile.

[0002]

2. Description of the Related Art FIGS.
A semiconductor pickup sensor shown in FIG. 9 is known. As shown in FIGS. 6 and 8, the semiconductor pickup sensor 1 has a sensor body 2 made of synthetic resin in which a pair of terminals 3 and 3 and a magnet 4 are integrally formed by insert molding of a resin. A substantially cylindrical case 7 made of a synthetic resin with a bottom for accommodating and covering the leg portion 2b, the portion of the pair of terminals 3 except for the base end 3a side, and the magnet 4 and the like is provided.

The sensor body 2 has a substantially cylindrical body 2a, a substantially semi-cylindrical leg 2b integrally formed below the body 2a, and a horizontal portion extending from one side of the body 2a. And a substantially cylindrical hood portion 2c having a bottom and integrally formed so as to protrude so as to extend in a substantially L-shaped side surface. A magnet 4 is insert-molded below the leg 2b of the sensor body 2. In the hood portion 2c of the sensor main body 2, the respective base ends 3a of the pair of terminals 3 are exposed to the outside from the bottom surface 2d, and the respective base ends 3a are fitted to the hood portion 2c. The pair of female terminals (not shown) of the mating connector 8 are electrically connected to each other. An electric wire W is connected to each of the female terminals.

A pair of terminals 3, 3 are bent in an L-shape along substantially the center of the sensor main body 2, and are connected to respective central portions 3b of the pair of terminals 3, 3 exposed along the legs 2b. Is a pair of leads 5 of a discrete type capacitor 5
a and 5a are connected and fixed by soldering. Further, a pair of leads 6a, 6a of a Hall IC 6 as a rotation detecting element are connected and fixed to each end 3c of the pair of terminals 3, 3 by soldering. This Hall IC 6 and magnet 4
The rotation detecting element configured to detect the change in the magnetic flux of the magnetic circuit formed by the magnet 4 and the gear (detected body) 9 to detect the rotation speed of the gear 9.

The synthetic resin case 7 has a bottomed substantially cylindrical tube portion 7a for accommodating the leg portion 2b of the sensor main body 2, a pair of terminals 3, 3 and the magnet 4 and the Hall IC 6 from its opening. The flange portion 7b integrally formed so as to extend horizontally in the horizontal direction from the upper end portion of the cylindrical portion 7a has a substantially side surface L.
It is shaped like a letter. An annular recess 7c is formed at the center of the outer periphery of the cylindrical portion 7a of the case 7, and the annular recess 7c is formed.
Is provided with a rubber O-ring 7d.

As shown in FIG. 10, an annular welding projection 7e formed on the upper end surface of the cylindrical portion 7a of the case 7 is ultrasonically welded to the butting surface 2e of the body 2a of the sensor body 2, or It is fixed by welding such as orbital vibration welding. Further, as shown in FIG. 7, a round hole 7f for attachment is formed in the flange portion 7b of the case 7, and the vehicle body (covered) is inserted through a fastening means such as a bolt (not shown) inserted through the round hole 7f. Mounting body) S. As a result, as shown in FIG.
The case 7 side is brought close to a gear 9 used for an engine or a transmission of an automobile. The protrusions 9a and recesses 9b of the gear 9 rotating in the direction of arrow A in FIG. 6 are detected by the magnet 4 and the Hall IC 6 of the semiconductor pickup sensor 1 so that the rotation speed of the gear 9 is detected. Has become.

[0007]

In the above-described conventional semiconductor pickup sensor 1, the mating connector 8 is a waterproof connector having a waterproof function such as a rubber stopper. When used in a harsh environment such as a place where water is splashed near a wheel or the like, each base end 3 of a pair of terminals 3 of the sensor main body 2 fitted and contacted.
There has been a concern that the electrical conductivity (contact reliability) between the a and each female terminal of the mating connector 8 and the waterproof reliability may be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a rotation detection method capable of improving the contact reliability and waterproof reliability of a pair of terminals even when used in a severe environment. It is intended to provide a sensor.

[0009]

According to a first aspect of the present invention, a rotation detecting element is assembled to a sensor body via a pair of terminals.
These rotation detecting elements and portions of the pair of terminals excluding the base ends are housed in a case and covered with the case, and the base ends of the pair of terminals are formed in the sensor main body in a substantially cylindrical shape. In a rotation detection sensor protruding outward from the bottom surface in the hood portion, each core wire of a pair of lead wires is connected to each base end of the pair of terminals exposed from the hood portion, and Each base end and each core wire of a pair of lead wires can be covered with a waterproof cap that penetrates the pair of lead wires and is fitted to the hood portion.

In this rotation detection sensor, each core wire of a pair of lead wires is connected to each base end of a pair of terminals exposed from inside the hood portion of the sensor body, and each base end of the pair of terminals is connected to a pair of leads. Each of the cores of the wires penetrates the pair of leads and is covered with a waterproof cap fitted to the hood, so that the electrical connection between the base ends of the pair of terminals and the cores of the pair of leads can be made. The conductivity and waterproof reliability are improved, and high performance is always maintained even when used in a severe environment.

According to a second aspect of the present invention, there is provided the rotation detecting sensor according to the first aspect, wherein a rubber cap is used as the waterproof cap, and the waterproof cap is provided in a closed space formed by the rubber cap and the hood. It is characterized by being filled with a waterproofing agent.

In this rotation detecting sensor, since the waterproofing agent is filled in the sealed space formed by the rubber cap fitted to the hood of the sensor body and the hood, the waterproof reliability is further improved. In addition, a high-quality rotation detection sensor with a simple structure can be obtained at low cost.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a semiconductor pickup sensor according to an embodiment of the present invention, FIG. 2 is a side view showing a state in which the sensor is being assembled, FIG. 3 is a plan view of the sensor.
4 is a sectional view taken along line XX in FIG. 3, and FIG.
It is sectional drawing which follows the Y line.

As shown in FIGS. 2 and 4, a semiconductor pickup sensor (rotation detection sensor) 10 includes a pair of terminals 1.
A sensor body 11 made of a synthetic resin in which the two parts 2 and 12 are integrally formed by resin insert molding, and a portion of the sensor body 11 excluding the legs 11b and a pair of terminals 12 and 12 except for the base end 12a side are housed and covered. And a substantially cylindrical case 15 made of synthetic resin having a bottom.

The sensor body 11 has a substantially cylindrical body 11a.
A substantially semi-cylindrical leg 11b integrally formed below the body 11a and a substantially cylindrical hood 11c with a bottom integrally formed above the body 11a. Has become. The bottom surface 11d is provided in the hood portion 11c.
The base ends 12a of the pair of terminals 12, 12 are exposed to the outside from the base, and the respective core ends 17a of a pair of lead wires 17, 17 described later are connected to the base ends 12a.

The portion between each base end 12a of the pair of terminals 12, 12 and each central portion 12b is integrated with the body 11a of the sensor body 11 by insert molding of resin. A pair of leads 13a, 1 of a discrete type capacitor 13 is located below the central portion 12b of the pair of terminals 12, 12 exposed along the portion 11b.
3a is connected and fixed by soldering. Further, a pair of leads 14a, 14a of a Hall IC 14 as a rotation detecting element are connected and fixed to each end 12c of the pair of terminals 12, 12 by soldering. The Hall IC 14 has a built-in magnet (not shown), and detects a change in magnetic flux of a magnetic circuit formed by the magnet and the gear (detected body) 9 to detect the rotation speed of the gear 9. is there.

The synthetic resin case 15 is connected to the leg 11b of the sensor body 11 and the pair of terminals 12 and 12 through the opening.
And a substantially cylindrical tube portion 15a having a bottom for accommodating the capacitor 13 and the Hall IC 14 except for the base end 12a side, and integrally formed so as to extend horizontally and horizontally from an upper end portion of the tube portion 15a. The flange 15b has a substantially L-shaped side surface. An annular recess 15c is formed at the center of the outer periphery of the cylindrical portion 15a of the case 15, and the annular recess 1c is formed.
A rubber O-ring 16 is attached to 5c.

As shown in FIG. 4, an annular welding projection 15e formed on the inner peripheral side of the upper end surface of the cylindrical portion 15a of the case 15 is formed on the outer periphery of the lower surface of the body 11a of the sensor body 11. It is fixed to the butting surface 11e by welding such as ultrasonic welding or orbital vibration welding. Further, a round hole 15d for mounting is formed in the flange portion 15b of the case 15, and the vehicle body (the body to be mounted) S is inserted through fastening means such as a bolt (not shown) inserted through the round hole 15d.
Attached to. As a result, as shown in FIG. 1, the case 15 side of the semiconductor pickup sensor 10 is brought close to the gear 9 used for an engine or a transmission of an automobile.

As shown in FIG. 2 and FIG.
Each of the base ends 12a of the pair of terminals 12, 12 projecting outwardly from the bottom surface 11d in the substantially cylindrical hood portion 11c is provided with a respective core wire 17 of a pair of lead wires 17, 17.
a are connected by welding. Furthermore, the base ends 12a of the pair of terminals 12, 12 and the cores 17a of the pair of lead wires 17, 17 are connected to the pair of lead wires 17,
A rubber cap (waterproof cap) 18 that penetrates through the hood 17 and fits into the hood portion 11c can be covered freely.
The pair of lead wires 17, 17 is connected to a control controller (not shown) on the vehicle side.

The rubber cap 18 has a substantially disc-shaped ceiling wall portion 18a having a thick central portion, and a cylindrical peripheral wall portion 18b extending below the peripheral edge of the ceiling wall portion 18a.
And Ceiling wall 18a of rubber cap 18
A pair of electric wire through-holes 18c, 18c are formed in the center of the thick part, and a waterproofing agent inlet 18d is formed at a predetermined position of the thin part of the ceiling wall part 18a.
In the center of the lower surface of the peripheral wall portion 18b of the rubber cap 18, an annular concave groove portion 18e fitted in the hood portion 11c of the sensor main body 11 in an airtight state without a gap is formed. Then, a waterproof mold agent (waterproofing agent) 19 melted from a waterproofing agent injection port 18d is injected into a sealed space P formed by the hood 11c and the rubber cap 18 fitted to the hood 11c. (Filled) and cured.

As shown in FIG. 2, the semiconductor pick-up sensor 10 of the embodiment described above has a pair of leads 12a connected to the base ends 12a of a pair of terminals 12 exposed outside the hood 11c of the sensor body 11. Each core 17 of the wires 17
a are directly connected to each other by welding, and then a rubber cap 18 penetrating the pair of lead wires 17, 17 is fitted to the hood 11c and assembled.
A waterproof molding agent 19 melted from a waterproofing agent injection port 18d in a closed space P formed by
Is completed by injecting and curing.

Then, the flange portion 15b of the semiconductor pickup sensor 10 is attached to a vehicle body via fastening means such as bolts, and as shown in FIG. 1, the resin case 15 side of the semiconductor pickup sensor 10 is connected to the engine of the automobile. And a gear 9 used for a mission or the like. Thereby, the hole I of the semiconductor pickup sensor 10 is
The protrusion 9a of the gear 9 that rotates in the direction of arrow A in FIG.
The rotational speed of the gear 9 is detected by detecting the unevenness of the gear 9 and the concave portion 9b, and the rotational speed of the gear 9 is controlled by the control controller.

As described above, the hood 1 of the sensor body 11
1c, each base end 12 of the pair of terminals 12, 12 exposed from the inside.
a, the respective core wires 17a of the pair of lead wires 17, 17 are directly connected by welding, and the pair of terminals 12,
Each base end 12a and each core wire 1 of a pair of lead wires 17, 17
7a can be covered with a rubber cap 18 that penetrates the pair of lead wires 17, 17 and fits tightly into the hood portion 11c, so that each base end 12 of the pair of terminals 12, 12 can be covered.
a and electrical reliability (contact reliability) and waterproof reliability between the core wires 17a of the pair of lead wires 17, 17 can be improved. Even when used in an environment, the semiconductor pickup sensor 10 can always maintain high performance.

Further, a waterproof material melted from a waterproofing agent injection port 18d of the rubber cap 18 into a sealed space P formed by the rubber cap 18 and the hood 11c fitted into the hood 11c of the sensor body 11. Since the molding agent 19 is injected and hardened, the waterproof reliability between the hood portion 11c of the sensor body 11 and the rubber cap 18 can be further improved, and a simple structure and high quality can be achieved. The semiconductor pickup sensor 10 can be provided at low cost.

According to the above-described embodiment, each base end of the pair of terminals and each core wire of the pair of lead wires are connected directly by welding, but they are connected by other connection means such as soldering. You may do so. In addition, although a molten mold agent different from the material of the sensor body was used as a waterproof agent to be filled in the sealed space between the hood portion of the sensor body and the rubber cap, a waterproof agent other than the mold agent may be used. is there. Furthermore, the semiconductor pickup sensor which detects the unevenness of a gear used for an automobile engine or a transmission with a Hall IC and controls the rotation speed of the gear with a control controller has been described. The present invention is not limited to gears used for missions and the like, and it is needless to say that the embodiment can be applied to a rotation detection sensor that detects the rotation of another object to be detected.

[0027]

As described above, according to the first aspect of the present invention, the respective core wires of the pair of lead wires are connected to the respective base ends of the pair of terminals exposed from the inside of the hood portion of the sensor body. Since each base end of the pair of terminals and each core wire of the pair of lead wires are freely covered with a waterproof cap that penetrates the pair of lead wires and is fitted to the hood portion, each base end of the pair of terminals and The electrical conductivity and the waterproof reliability of the pair of lead wires with each core wire can be improved, and the high performance can always be maintained even when used in a severe environment.

According to the second aspect of the present invention, since the waterproof agent is filled in the closed space formed by the rubber cap fitted to the hood of the sensor main body and the hood, the waterproof reliability is improved. It is possible to further improve and provide a high-quality rotation detection sensor with a simple structure at low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing a semiconductor pickup sensor according to one embodiment of the present invention.

FIG. 2 is a side view showing a state in which the semiconductor pickup sensor is being assembled.

FIG. 3 is a plan view of the semiconductor pickup sensor.

FIG. 4 is a sectional view taken along line XX in FIG.

FIG. 5 is a sectional view taken along line YY in FIG. 3;

FIG. 6 is a side view of a conventional semiconductor pickup sensor.

FIG. 7 is a plan view of the conventional semiconductor pickup sensor.

FIG. 8 is a sectional view taken along the line ZZ in FIG. 7;

FIG. 9 is a side view showing a usage state of the conventional semiconductor pickup sensor.

FIG. 10 is an enlarged sectional view of a main part for explaining welding between the sensor body of the conventional semiconductor pickup sensor and a resin case.

[Explanation of symbols]

 Reference Signs List 10 semiconductor pickup sensor (rotation detection sensor) 11 sensor main body 11c hood portion 11d bottom surface 12, 12 pair of terminals 12a base end 14 Hall IC (rotation detection element) 17, 17 pair of lead wires 17a core wire 18 rubber cap (waterproof) Cap) 19 Molding agent for waterproofing (waterproofing agent) P Sealed space

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F063 AA35 BD16 CA31 DA05 EA03 GA52 GA68 GA69 GA79 KA02 2F077 CC02 NN04 NN21 PP12 QQ01 VV03 WW03 WW06

Claims (2)

[Claims] 1. A rotation detecting element is assembled to a sensor main body via a pair of terminals, and the rotation detecting element and portions of the pair of terminals except for the base end sides are housed in a case and covered with the case. In a rotation detection sensor in which respective base ends of the pair of terminals project outward from a bottom surface in a substantially cylindrical hood formed in the sensor main body, the bases of the pair of terminals exposed from the inside of the hood are provided. The respective ends of the pair of lead wires are connected to the ends, and the base ends of the pair of terminals and the respective core wires of the pair of lead wires penetrate through the pair of lead wires and are fitted to the hood portion. A rotation detection sensor characterized by being freely covered with a waterproof cap. 2. The rotation detection sensor according to claim 1, wherein a rubber cap is used as the waterproof cap, and a waterproof agent is filled in a closed space formed by the rubber cap and the hood. A rotation detection sensor.