JPS5928753B2 - Distributor of non-contact ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 25. The present invention relates to a power distributor for a non-contact ignition device for an internal combustion engine of a vehicle or the like.

Conventionally, this type of power distribution device includes a rotor in a housing whose rotation angle is controlled by a centrifugal advance mechanism, a stator 30 whose rotation angle is controlled by a vacuum advance mechanism, and a magnetic flux is formed between the rotor and the stator. A device having a permanent magnet and a pickup coil interlinked with the magnetic flux is known.

In the above-mentioned power distribution device, the three components of the stator, permanent magnet, and pickup coil are fixed on a holding plate, and the holding plate is supported by a fixed plate in the housing from its upper and lower surfaces via bearings. , it is inevitable that the moving parts will be heavier.

As a result, an excessive weight acts on the bearing, and under such conditions, the vibration of the vehicle is also applied, which significantly reduces the durability of the bearing.As a result, the movement of the stator etc. becomes less smooth, so the diaphragm of the vacuum advance mechanism Unless the pressure-receiving area is increased, the response of the stator will be poor, resulting in an unavoidable increase in the size and cost of the above-mentioned mechanism. The present invention was proposed in view of the above-mentioned conventional problems, and is configured so that the above-mentioned permanent magnets and pickup coils are fixed and only the stator is rotated, thereby improving the durability of the bearing and downsizing the vacuum advance mechanism. , while aiming to reduce costs,
The purpose is to simplify the structure by allowing the support of the permanent magnet and coil and the outer race of the bearing to be fixed to the housing using a common fixing device, and its features are as follows.
A permanent magnet and a pickup coil are fixed to a support plate having a protrusion on the outer periphery, and a recess for accommodating and supporting the protrusion and a collar adjacent to the protrusion is opened in the inner peripheral surface of the housing, Furthermore, an annular stepped portion is formed on the inner circumferential surface of the housing, extending inward in the radial direction of the rotor than the collar and crossing the recessed portion, and this stepped portion is provided with an outer race of a bearing that rotatably supports the stator. A backing plate that fits and supports the outer race and prevents the outer race from separating from the annular stepped portion is fastened together with the protrusion and collar to the housing using a common bolt.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 is a housing made of die-cast aluminum, for example.
- Consists of a housing body 2 and a cap 3 made of synthetic resin.

Above...A shaft 5 is rotatably supported within the cylindrical portion 2a protruding from the lower part of the housing body 2 via oil-impregnated bearing metals 4, 4, and a gear 6 is mounted at the lower portion of the rotary shaft 5 protruding from the cylindrical portion 2a. Fixed. A gear fixed to a camshaft of an internal combustion engine (not shown) meshes with the gear 6 to rotate the shaft 5. A lower part of a shaft 8 to which a rotor 7 is fixed is rotatably inserted into and supported by the upper part of the rotating shaft 5 protruding into the housing body. The rotor 7 has four
An annular stator 11, which has four protrusions 9a to 9d on its inner circumferential surface at regular intervals outside the rotor 7, is connected to the rotor 7 through a ball bearing 12 as a bearing. ... Rotatably supported on the upper inner circumferential surface of the housing body 2. As shown in FIG. 3, the outer race 13 of the ball bearing 12 is fitted into an annular step 14 formed on the upper inner circumferential surface of the housing body, and in the figure, the outer circumferential edge of the stator 11 also serves as the inner race. ing. A pickup coil 16 wound around a bobbin 15 loosely inserted into the rotor shaft 8 is disposed below the rotor 7 and the stator 11, and an annular permanent magnet 17 is disposed around the outer circumference of the pickup coil 16. The pickup coil 16 is a permanent magnet 1
7, the inner circumferential surface of the bobbin of the coil 16, the upper surface of the bobbin and the permanent magnet, and the outer circumferential surface of the permanent magnet are coated with synthetic resin R, so that the coil 16 and the permanent magnet 17 are integrated. There is. The coil 16 and the permanent magnet 17 are fixed by adhesive to the upper surface of an iron support plate 18 whose lower surface is loosely inserted into the rotor shaft 8. The support plate 18 has a pair of protrusions 20 that protrude outward in the radial direction at equal intervals on the circumference,
Both protrusions 20 are fitted into recesses 19 formed at opposing positions on the lower inner circumferential surface of the housing body 2, so that the support plate 18 is supported within the housing body 2.
When the projections 9a to 9d of the rotor 7 face the projections 10a to 10d of the stator 11, a magnetic flux is formed between the permanent magnet 17, the stator 11, the rotor 7, the rotor shaft 8, the support plate 18, and the permanent magnet 17. Then, the voltage induced in the pick-up coil 16 due to the misalignment of the respective protrusions is appropriately amplified and applied to the opening/closing control element of the spark plug system circuit of the ignition device, and is applied to the corresponding side electrode from the power distribution electrode described later. A high voltage is distributed to the spark plug to spark the spark plug.

The outer race 13) of the ball bearing 12 and the fixing bolts 21, 22 of the support plate 18 are made of a non-magnetic material such as brass to prevent leakage of magnetic flux caused by the permanent magnet. At this point, the upper surface of the outer race 13 is covered with the backing plates 23 and 24 which are attached to the bolts 21 and 22 and secured to the bolt heads, and the bottom of the collar 25 which is made of the same material as the bolts 21 and 22 and inserted through the bolts. The annular stepped portion 14 presses and fixes the upper surface of the protruding portion 20 of the support plate 18 with its end face, and the annular step portion 14 extends inwardly in the radial direction of the rotor 7 than the collar 25 accommodated in the recessed portion 19. 19 is formed on the inner circumferential surface of the housing body 2.

The housing body 2 has an outwardly projecting chamber 26 in its upper part, and a case 29 of a known vacuum advance mechanism 28 connected to the intake manifold of the engine is connected to an opening 27 of the chamber 26 with a bolt 30. Fixed by

The vacuum advance mechanism 28 includes a diaphragm (not shown), and a lever 31 operated by the diaphragm passes through the chamber 26 and has its tip fixed to the upper surface of the stator 11 with a bolt 32. The stator 11 is rotated via the lever 31 by the vacuum advance mechanism 28,
Each of the protrusions 10a to 10d and each of the protrusions 9a of the rotor 7
The ignition timing is advanced when the time from the first confrontation to the next confrontation from 9d to 9d is shortened.

Further, the housing main body 2 has a series of convex edges 33 for waterproofing and dustproofing around the entire circumference of the opening including the upper edge of the chamber 26,
The protruding portion 33a above the chamber 26 is used for positioning when attaching the cap.

The rotational force to the rotor 7 is transmitted from the rotating shaft 5 through a known centrifugal advance mechanism 39 provided at the lower part of the housing main body.

The centrifugal advance mechanism 39 includes a support plate 34 integral with the rotating shaft 5, a pair of weight plates 35 rotatably attached to the plate 34, a cam plate 36 fixed to the rotor shaft 8, and a cam plate 36 fixed to the rotor shaft 8. It has a pair of coil springs 38 that connect the upper pin 37a and the pin 37b on the support plate 34. The rotation of the rotating shaft 5 is transmitted to the rotor shaft 8 via the centrifugal advance mechanism 39,
By increasing the rotational speed of the rotor 7, each of the protrusions 9a to 9d of the rotor 7 and each of the protrusions 10a to 10 of the stator 11
The time from the first opposing position to the next opposing position is shortened, and the ignition timing is advanced. A power distribution rotating plate 40 is fixed to the upper part of the rotor shaft 8, and a power distribution electrode 4 is mounted on the upper surface of the power distribution rotating plate 40.
1.

The base of the power distribution electrode 41 contacts the center electrode 42 of the cap 3, and the tip protrudes toward the circumference of the power distribution rotary plate 40, facing the four side electrodes 43 of the cassette 3 in sequence, and distributes high voltage. , which causes the spark plug to spark. The cap 3 is formed in such a shape that its opening 44 fits around the outer periphery of a convex edge 33 formed on the mouth edge of the housing body 2, and the protruding portion 33 of the convex edge 33 of the housing body 2
a for positioning the cap 3, and each side electrode 4
The cap 3 is fitted onto the mouth edge of the housing main body without erroneously positioning the cap 3 and fixed with bolts 45.

46 is a spring pin for preventing rotation of the rotor 7 and shaft 8.

As described above, according to the present invention, the rotor 7 whose rotation angle is controlled by the centrifugal advance mechanism 39 and the stator 11 whose rotation angle is controlled by the vacuum advance mechanism 28 are provided in the housing.
The permanent magnet is installed in a power distributor of a non-contact ignition device for an internal combustion engine, which has a permanent magnet 17 for forming a magnetic flux between the rotor 7 and the stator 11, and a pickup coil 16 that interlinks with the magnetic flux. 17 and the pickup coil 16 are fixed to a support plate 18 having a protrusion 20 on the outer periphery, and a recess 19 for accommodating and supporting the protrusion 20 and the collar 25 adjacent to the protrusion 20 is formed in the housing 1. The recess 1 is opened on the inner circumferential surface of the housing 1 and is further provided on the inner circumferential surface of the housing 1 inwardly in the radial direction of the rotor 7 than the collar 25.
9 is formed, and an outer race 13 of a bearing 12 that rotatably supports the stator 11 is fitted into and supported by this step 14.
a backing plate 23 for preventing separation from the annular step portion 14;
24 is fastened to the housing 1 together with the protrusion 20 and the collar 25 using the common bolts 21 and 22, so that the pickup coil 16 and the permanent magnet 17 are attached to the support plate 1.
8 is fixed inside the housing 1, and the only movable part is the stator 11, which can reduce the weight burden on the bearing 12. Moreover, the pickup coil 16 and the magnet 17
Since the vibrations do not directly act on the bearing 12, the durability of the bearing 12 can be significantly improved.

Moreover, since the stator 11 can be rotated smoothly by the vacuum advance mechanism 28, the responsiveness of the stator 11 is high even if the output of the vacuum advance mechanism 28 is small, and the advance mechanism 28 is compact and low in cost. This can contribute to the In particular, the bearing outer race 13 that supports the stator 11...
Since the annular step 14 on the inner circumferential surface of the housing 1 and the protrusion 20 of the support plate 18 are fitted and supported in the recess 19 on the inner circumferential surface of the housing 1, the annular step can be placed inside the housing 1 in two directions, upper and lower. Compared to the case where the housing 1 is formed in stages, the outer diameter of the housing 1 can be made smaller.
Can be made smaller.

Further, since the annular step 14 crosses the recess 19 inwardly in the radial direction of the rotor 7 than the collar 25 accommodated in the recess 19, the annular step 14 and the recess 19
It goes without saying that the bearing outer race 13 and the supporting plate protrusion 20 can be partially overlapped in the rotor 7 axial direction, thereby further contributing to the miniaturization of the housing 1. the collar 25 of the recess 19
It can be housed inside without any problem.

And, with the abutment plates 23 and 24 fastened to the housing 1 together with the collar 25 and the support plate protrusion 20,
Since it is possible to reliably prevent the bearing outer race 13 from detaching from the encircling stepped portion 14, there is no need to provide a special fixing device for the bearing 12 on the housing 1 side, which reduces the structure. is simplified, which can contribute to cost reduction and improved assembly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional front view, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line 1-2 in FIG. DESCRIPTION OF SYMBOLS 1... Housing, 7... Rotor, 11... Stator, 12... Bearing, 14... Annular step part, 1
6...Pickup coil, 17...Permanent magnet, 1
8... Support plate, 19... Recessed part, 20... Protrusion part,
21, 22... Bolt, 23, 24... Backing plate, 2
8...Vacuum advance angle mechanism, 39...Centrifugal advance angle mechanism.

Claims (1)

[Claims] 1. A rotor 7 whose rotation angle is controlled by a centrifugal advance mechanism 39 in the housing 1, a stator 11 whose rotation angle is controlled by a vacuum advance mechanism 28, and a magnetic flux is formed between the rotor 7 and the stator 11. In a power distributor for a non-contact ignition device for an internal combustion engine, which has a permanent magnet 17 for the magnetic flux and a pickup coil 16 interlinked with the magnetic flux, the permanent magnet 17
and the pickup coil 16 is fixed to a support plate 18 having a protrusion 20 on the outer periphery, and the protrusion 20 and the protrusion 20
A recess 19 is opened in the inner peripheral surface of the housing 1 to receive and support the collar 25 adjacent to the collar 25, and the recess 19 is provided in the inner peripheral surface of the housing 1 to accommodate and support the collar 25 adjacent to the collar 25. An annular step 14 is formed across the recess 19 , an outer race 13 of a bearing 12 that rotatably supports the stator 11 is fitted into and supported by the step 14 , and the outer race 13 is detached from the annular step 14 . A common bolt 2 is attached to the housing 1 together with the protrusion 20 and the collar 25.
1. A power distribution device for a non-contact ignition device for an internal combustion engine, characterized in that it is fastened with 1 and 22 screws.