JP2830873B2 - Power distribution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution device for an internal combustion engine, and more particularly to a power distribution device provided with a signal detection device in addition to a power distribution section.

[0002]

2. Description of the Related Art Conventional distributors are disclosed in Japanese Utility Model Publication No. 60-45875, Japanese Utility Model Application No. 58-101868 (Japanese Utility Model Application No. 60-8479), and Japanese Utility Model Application No. 61-69434 (Japanese Utility Model Application No. As shown in an application specification photographed on a microfilm of No. 180671), a cylindrical metal housing made of aluminum was provided, and a signal detection device was incorporated therein.

[0003]

Such a conventional power distribution device comprises a signal detection device and a cover for covering the signal detection device.
Insert the cover of the detector between the cap and the metal housing.
To secure the cover easily.
However, the metal housing part is large against the weight of the distributor.
And the weight of the distributor is heavy.
there were.

An object of the present invention is to provide a cover for a conventional signal detection unit.
The metal housing of the distributor while using the
Parts and reduce weight without deteriorating installation workability.
It is to reduce the amount.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a metal distributor base, and a base mounted on the base.
A power distribution cap made of resin, the base, and the cap.
Between the base and the cap
A signal detector having a resin peripheral wall exposed to the outside at
A seal portion provided between the cap and the signal detection portion.
Material, and the signal detection unit and the seal member are
Tightening when fixing the cap to the base with screws
Using a distributor that is configured to be pressed by force
You.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings.

[0007] 1 is a distributor shaft which is synchronized with the engine and rotates at half its rotation speed, 2 is a housing having a flat surface as a mounting base, and 3 is a bearing.

A first collar 4 is attached to one end of the distributor shaft 1, and a pin 5 is attached to a flange 4 a of the collar 4.
Is press-fitted. The pin 5 is fitted in a hole provided in the flange portion 6a of the second collar 6.

A rotating disk 8 is interposed between the flange portions 4a and 6a, and the second collar 6 and the first collar 4 are pressed against the step portion of the distributor shaft 1 by screws 9. West,
The rotating disk 8 is sandwiched between the flange portions 4a and 6a.

Reference numeral 10 denotes a case made of a synthetic resin, in which the hybrid integrated circuit 12 and the light receiving element 24 are provided.

The photoelectric pickup 13 has a shape in which the holder 22 on which the light emitting element 23 is installed and the case 10 are integrally fixed by screws (not shown), and the case 10 has a screw 15a (see FIG. 2). Hereinafter, a hybrid integrated circuit 12 installed in a case 10 and a photoelectric pickup 13 as a signal detection device
Are referred to as a signal detection unit 15.

A screw hole 2b is formed in the flange portion 2a of the housing 2, and a screw 2c inserted through a metal bush 7b molded on the mounting foot 7a of the power distribution cap 7.
Are screwed into each other so that the power distribution cap 7 is
It is fixed to. The housing 2 and the power distribution cap 7
A cup-shaped cover made of polybutylene phthalate 1
7 is provided to press down the sealing elastic seal members 18 installed between the housing 2 and the cover 17 and between the outer periphery of the connector portion 51 and the cover 17. In addition, a sealing elastic seal member 19 communicating between the collar 6 and the cover 17 is also provided.
Is installed. Further, the cover 17 is provided with a ventilation hole 71 communicating between the inside and outside of the power distribution unit.

The sealing elastic member 18 includes an annular elastic sealing member portion 81 interposed between the cover 17 and the base of the housing 2, and an annular elastic sealing member portion interposed between the connector portion 51 and the cover 17. 82. As shown in FIG. 5B, both seal member portions 81 and 82 are formed as a double annular portion in the same plane, and the small annular portion is used by being raised at a right angle as shown in FIG. 5A.

Here, the distributor shaft 1 rotates in synchronization with the rotation of the engine (not shown), and the optical signal interrupted by the rotating disk 8 is converted into an electric signal by the integrated circuit 12, and the crank angle position signal of the engine As the signal detection unit 15
Is transmitted to a control device (not shown) through the connector unit 51 to control the engine.

The upper surface of the housing 2 is formed as a substantially flat surface, and does not substantially have a rising portion forming the peripheral wall of the power distributor. Instead, an insulating cover 17 surrounding the signal detection unit is provided with a peripheral wall, which forms the lower half of the peripheral wall of the distributor.

The upper half of the peripheral wall of the distributor is formed by a distribution cap.

In this embodiment, a power distribution rotor storage chamber is formed between the cover 17 and the power distribution cap, and a signal detection device storage chamber composed of the cover 17 and the housing (base) 2 is formed below the power distribution rotor storage chamber. .

At the center of the cover 17, there is formed a stepped portion 17a for forming a labyrinth seal between the cover 17 and the periphery of the shaft portion. As a result, it is possible to prevent ozone generated in the upper distribution rotor chamber, electrode powder due to electric discharge, and the like from entering the lower signal detection device housing chamber.

Reference numeral 20 denotes a power distribution unit composed of side electrodes integrally molded on a power distribution cap, 21 denotes a center electrode for transmitting a high voltage from a not-shown ignition coil to a rotor voltage 22,
23 is a high-pressure tower connected to the output end of the ignition coil, 6c
Is a high-pressure tower that sends high voltage distributed from the rotor electrode to the side electrode to the spark plug.

The assembling method will be described.

The distributor shaft 1 is supported on the housing 2 via the bearing 3. 3a is a bearing retainer.

A small annular portion 82 of the sealing elastic member 18 is provided around the connector portion 51 of the signal detection unit 15, and another large annular portion is arranged around the annular step 2 d of the housing 2. Is fixed to the housing 2 by screws 15a.

After the rotary disk 8 is sandwiched between the collars 6 and 4 and positioned and fixed with the pins 5, the rotary disk 8 is inserted into the central hole of the signal detection unit 15 while the rotary disk 8 is Into the gap between the light receiving and emitting elements 23 and 24.

In this state, the opening 72 of the cover 17 is next.
Cover the cover 17 while positioning it so that it fits right into the connector portion 51.

Next, a screw 9 is screwed in from the center of the collar 6 to fix the collar to the shaft.

Thereafter, the power distribution rotor 14 is fitted and fixed to the upper end of the collar 6.

An annular sealing elastic member 19 is disposed on the outer peripheral step of the cover 17 and the power distribution cap 7 is covered thereover. The bush 7b provided on the mounting leg 7a of the cap and the screw hole 2b of the housing 2 are correctly aligned. The screw 2c is inserted and fixed.

At this time, the force pressing the power distribution cap 7 against the housing is transmitted to the cover 17 via the sealing elastic member 19, and presses the cover 17 toward the sealing elastic member 18. Thus, the power distribution cap 7 and the cover 17 are fixed to the housing 2. According to this embodiment, it waterproof cover 17 of the connector portion 51 takes a structure for pressing a sealing elastic member 18 in the axial direction of the shaft at the opening 72, provided with ventilation holes 71 communicating the distribution unit and out to the cover 17 Since it is structured to discharge gas such as ozone generated in the power distribution unit, stable ventilation performance and waterproof performance can be obtained, and the distance from the high voltage power distribution unit 20 to the surface of the housing 2 as the ground is secured. be able to. Therefore, the height of the entire distributor can be reduced, and the sealing structure of the connector can be simplified, so that the distributor is excellent in weight reduction and cost reduction.

[0029]

[0030]

The signal detection device housed in the cover 17 is not limited to the photoelectric pickup type crank angle sensor of the embodiment. It may be a magnetic pickup type or an ignition signal generator.

[0032]

As described above, according to the present invention, the power distribution
Since the peripheral wall of the power distribution unit itself is formed by the resin member having the electric device inside the mounting unit on the base of the power distribution unit , that is , the peripheral wall of the signal detection unit , the metal part of the power distribution unit is reduced, the weight is reduced, and the diameter is reduced. Can be made smaller, so it can be made smaller . In addition,
The cover of the signal detector and the seal member.
Achieved at the same time as installing the power distribution cap, making work easier
become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a power distribution cap and an insulating cover of FIG. 1 are removed.

FIG. 3 is a perspective view of the insulating cover of FIG. 1;

FIG. 4 is a perspective view of the power distribution cap of FIG. 1;

FIG. 5A is a diagram illustrating a use state of a sealing elastic member, and FIG. 5B is a diagram illustrating a non-use state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Distribution shaft, 2 ... Housing, 6 ... Collar, 7
... Distribution cap, 8 ... Rotating disk, 14 ... Distribution rotor, 1
5: signal detection unit, 17: cover, 18, 19: sealing elastic member, 20: power distribution unit, 51: connector unit, 6
1. Cap notch, 71: ventilation hole, 72: opening.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 7/04

Claims (2)

(57) [Claims] A metal distribution base, a resin distribution cap mounted on the base, and a base mounted between the base and the cap;
A resin peripheral wall exposed to the outside between
A signal detection unit to be provided, and a seal installed between the cap and the signal detection unit
A member, wherein the signal detection unit and the seal member
Pressed by the tightening force when screwing and fixing to the base
Distributor that is configured to be. 2. The signal detection unit according to claim 1, wherein the signal detection unit includes a signal detection unit and an insulating cover.
Distributor characterized by being comprised.