JPH07710Y2 - Pulsar - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pulser for obtaining an engine ignition timing signal from a pickup coil according to rotation of a rotor provided with a permanent magnet.

2. Description of the Related Art Generally, in a non-contact type engine ignition device such as CDI, a cylinder of an engine is compared with a rotor provided with a permanent magnet that rotates in synchronization with the engine and magnetic poles are arranged around the engine. A plurality of pickup coils are arranged on the fixed side according to the number, and each pickup coil detects the change of the air gap magnet due to the rotation of the rotor and obtains the engine ignition timing signal for each cylinder. I am trying.

Conventionally, in this type of pulsar, FIG.
As shown in (b), one end of the core 3'is attached to the base plate 4 by caulking, and the mutually assembled core 3'and base plate 4 are placed in the coil case 5'so that a part of the base plate 4 is exposed. Then, the coil bobbin 2 in which the coil 1 is wound around the core 3'is mounted, and then the resin is injected from the open end of the coil case 5'and molded to form a pickup coil. .

However, if such a pickup coil manufacturing method is adopted, the work of crimping the core 3'on the base plate 4 is required, and the assembling property thereof deteriorates.

In addition, the coil bobbin 2 is attached to the core 3'in the coil case 5 '.
It is necessary to use the coil case 5 ′ whose side surface is open as shown in the figure for mounting the coil case. Therefore, in order to inject the resin into the coil case 5 ′, the coil case 5 ′ must be laid down sideways. Therefore, the workability is poor.

Purpose The present invention has been made in consideration of the above points, and facilitates the mounting of the core to the base plate and the assembling of each component in the coil case, and the optimum injection of resin into the coil case. In order to improve the workability in manufacturing the pickup coil, the pulsar is provided.

Configuration Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The pulsar according to the present invention is shown in FIG.
As shown in (b), a groove 6 is formed in a vertical direction in a base plate 4 provided in advance on the side of the coil case 5 having an open upper side so that the upper portion is opened.
The coil bobbin 2 on which the coil is wound is press-fitted from one end of the core 3 from above to mount the coil unit in the coil case 5, and then resin is injected from above the coil case 5 to form a pickup. It is designed to form a coil.

However, with such a structure, no work such as caulking for attaching the core 3 to the base plate 4 side is required, and after the core 3 is attached to the base plate 4, it is put in the coil case 5. After that, without attaching the coil bobbin 2 to the core 3 portion, one end of the core 3 to which the coil bobbin 2 is attached in advance is inserted into the groove 6 from above from the base plate 4 provided on the coil case 5 side. Just insert it and press it in,
The coil unit can be easily fixed and assembled in the coil case 5.

Further, since the coil case 5 is open at the upper side, resin can be injected into the coil case 5 in the same state as when the coil unit is put into the coil case 5 from above. .

It should be noted that the base plate 4 and the coil case 5 are not separated from each other, and the base plate 4 and the coil case 5 are not separately provided.
It goes without saying that and may be integrally formed.

Further, when a plurality of pickup coils are installed on the rotor according to the number of cylinders of the engine, if the base plate 4 of each pickup coil is integrally formed so as to be common, the assembling property of each pickup coil can be improved. Will be able to.

FIG. 2 shows a concrete configuration example of the pulsar according to the present invention. In the outer rotor type in which the rotor 10 rotates around the outer circumference of the pickup coils 7, 8 and 9, the pickup coils 7, 8 and 9 are A coil case 12 whose upper side is opened is formed integrally with the mounting plate 11 on the fixed side.
Each of the pickup coils 7, 8 and 9 is directly molded on the mounting plate 11 by incorporating the coil unit 13 therein and injecting a resin into the coil case 12 to cure the resin. In the figure, 14 indicates a resin portion.

Here, a configuration of a pulsar used in an ignition device of a three-cylinder engine for an outboard motor is shown, and each pickup coil 7, 8, 9 has a relative angle of 120 ° with respect to a center O of a circular mounting plate 11. It is installed in a position with.

Here, the rotation of the crankshaft (not shown) of the engine is transmitted to the rotor 10 via the belt, and the rotor 10 drives the camshaft 15 passing through the hole formed in the center of the mounting plate 11. ing.

Each coil unit 13 is assembled in each coil case 12 by pressing both ends of the core 3 into the grooves 16 and 17 formed in the coil case 12 in the vertical direction from above.

At that time, one end surface of the core 3 is exposed outside the coil case 12 and faces the magnetic poles on the rotor 10 side with a gap, so that the change in the gap magnetic flux due to the rotation of the rotor 10 synchronized with the engine can be captured. It has become.

Also, a hole 18 is drilled on one side of the coil case 12,
A rubber bush 19 is fitted in the hole 18 portion, and a lead wire 21 connected to the coil wire at the end of the coil 1 via a connection terminal 20 is drawn out to the outside through the rubber bush 19.

The rotor 10 is made of a non-magnetic material, and a permanent magnet 22 is provided in a part of the periphery of the rotor 10 with cores 23, 24 having the polarities shown
And the magnetic pole is formed by being embedded.

As for the magnetic poles, both ends of the core 23 are S poles and the ends of the core 24 are N poles, so that S, N and S poles are sequentially arranged in the rotation direction of the rotor 10. ing.

Thus, by making the magnetic poles of the rotor 10 have a three-pole structure in this way, when the cores 3 on the side of the pickup coils 7, 8 and 9 cut off the air gap magnetic flux in accordance with the rotation of the rotor 10, the S pole and the N pole are formed. The air gap magnetic flux density between the pole and each pole becomes high, and the rising and falling of the voltage signal output from each pickup coil 7,8,9 at the time of switching the magnetism becomes sharp. A voltage signal for cycles is obtained.

In the pulsar having such a configuration, the pickup coils 7, 8 and 9 are mounted on the mounting plate 11 without any work for mounting the pickup coils 7, 8 and 9 on the mounting plate 11. Each pickup coil 7,8,
9 can be assembled with high position accuracy.

In addition, a component such as a base plate or a screw for mounting the pickup coils 7, 8, 9 on the mounting plate 11 is not required, and the pickup coils 7, 8, 9 provided on the mounting plate 11 are not required.
The structure of the part is simplified.

Effect As described above, in the present invention, the motor rotates in synchronization with the engine,
The pickup coil provided on the fixed side detects the change in the air gap magnetic flux due to the rotation of the rotor in which the permanent magnet is provided so that the magnetic poles are arranged on the peripheral surface, and the engine ignition timing signal corresponding to the rotation of the rotor is detected. In the pulsar to be obtained, the base plate is integrally provided on the coil case side so that the rising portion of the base plate bent at a right angle projects upward in the inside of the coil case whose upper portion is open, and the rising portion of the base plate. A groove is formed in the vertical direction so that the upper part opens, and one end of the core of the coil unit is press-fitted into the groove from above to mount the coil unit in the coil case. A pickup coil is constructed by pouring and molding, mounting the core on the base plate. It is possible to easily assemble the respective parts into the coil case and to inject the resin into the coil case in an optimum state, thereby effectively improving the workability in manufacturing the pickup coil. It has the excellent advantage of

Particularly, according to the present invention, when molding a plurality of pickup coils on the same mounting plate according to the number of cylinders of the engine, the coil unit is assembled and the resin is injected from the same direction for each coil case. It has the advantage that it can be performed and simultaneous molding is possible.

[Brief description of drawings]

FIG. 1 (a) is a front sectional view of a pickup coil portion in a pulsar according to the present invention, FIG. 1 (b) is a side view of its core and base plate portion, and FIG. 2 is a specific configuration example of the pulsar according to the present invention. The top view shown, FIG. 3 (a)
Is a front sectional view of a pickup coil portion in a conventional pulsar, and FIG. 6B is a side view of its core and base plate portion. 1 ... Coil, 2 ... Coil bobbin, 3 ... Core, 4 ... Base plate, 5,12 ... Coil case, 6 ... Groove, 7,8,9 ... Pickup coil, 10 ... Rotor, 11 ... Mounting plate

Claims (1)

[Scope of utility model registration request] 1. A pickup coil provided on the fixed side detects changes in the air gap magnetic flux caused by rotation of a rotor that rotates in synchronization with an engine and has a permanent magnet so that magnetic poles are arranged on the peripheral surface. In a pulsar that obtains an engine ignition timing signal according to the rotation of a rotor, the base plate is coiled so that the rising portion of the base plate bent at a right angle projects upward into the inside of the coil case whose upper side is open. Is formed integrally with the coil plate, and a vertical groove is formed in the rising portion of the base plate so that the upper part opens, and one end of the core of the coil unit is press-fitted into the groove from above to insert the coil unit into the coil case. After mounting, the pickup coil was constructed by injecting resin from above the coil case and molding. Pulsar that characterized the door.