JPH0468468B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an ignition timing control device used in internal combustion engines, and more specifically to an ignition timing control device that has two types of characteristics such as advance and retard. Regarding equipment.

(Prior Art) In an ignition timing control device for an internal combustion engine, a single diaphragm is used to perform both advance and retard.

Referring to FIG. 5, the known ignition timing control device fixes an annular plate 12 to a first casing 11 and clamps a diaphragm 14 between the first casing 11 and the second casing 13. ing. The seat 16 is pressed against the plate 12 by a first spring 15. Diaphragm 1
A collar 17 fixed to 4 is inserted through the plate 12 and the seat 16, and a second spring 18 is provided between the plate 12 and the collar 17.

(Problems to be Solved by the Invention) In the known ignition timing control device configured as described above, since the outer diameter of the seat 16 is larger than the inner diameter of the plate 12, the first casing 11 is formed into a cylindrical shape. , when assembling, insert the diaphragm 14 from one side of the plate 12 and the collar 1 from the other side.
7 was inserted. In addition, since the collar 17 is provided with a second spring 18, it is divided into two parts, and the collar member ₁₇₁ on one side is connected to the diaphragm 1.
The collar member 17 ₂ on the other side was screwed to the collar member 17 ₁ on the one side after the sheet 16 was inserted.

As described above, the known ignition timing control device requires many assembly steps and has a large number of parts.

Furthermore, the parts require threading, etc., resulting in high costs.

Furthermore, in order to seal the end of the first casing 11, the lid 19 is press-fitted and adhered, requiring adhesive or packing.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ignition timing control device that eliminates the above-mentioned drawbacks, simplifies the assembly process, reduces the number of parts, and reduces costs.

(Means for Solving the Problems) The present invention is characterized by a first casing 21 having a substantially pot-like shape;
a ring-shaped plate 22 fixed to the inside of the plate 22 and having an insertion hole formed in the center; a notch 23 formed on the inner periphery of the insertion hole of the plate 22; a second casing 13; A diaphragm 14 held between the casing 21 and the second casing 13, a sheet 24 with a non-circular hole 29 formed in the center, and a sheet 24 rising from the outer peripheral edge of the sheet 24. A contact member is formed by bending the tip of the foot portion 25, and is inserted into the notch 23 of the plate 22 and rotated by a predetermined angle to contact the plate 22 from the inside. portion 26, provided between the first casing 21 and the sheet 24, and the contact portion 2
a first spring 15 that urges the diaphragm 6 in a direction to press the plate 22 and at the same time adjusts the stroke due to the negative pressure acting on the diaphragm 14;
a collar 27 formed on the collar 27 and inserted through the hole 29 of the sheet 24 to insert the diaphragm 1 into the diaphragm 1;
4 and a positive pressure that is provided between the sheet 24 and the collar 27 and urges the collar 27 away from the sheet 24 and acts on the diaphragm 14 at the same time. and a second spring 18 that adjusts the stroke by, and has both advance angle and retard angle characteristics.

(Function) With the above configuration, parts such as the seat 24, collar 27, and diaphragm 14 can be assembled only from one side of the plate 22, simplifying the assembly process and simplifying the structure of the first casing 21.
Thread machining and screw assembly processes, as well as adhesives and packings, are omitted.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The first casing 21 has a substantially cup-like shape with closed ends, and a plate 22 is fixed inside the first casing 21 . The plate 22 has a ring shape with an insertion hole formed in the center.
A notch 23 is formed on the inner periphery. It is desirable that a plurality of these notches 23 are provided at equal angles, and in this embodiment, four notches 23 are provided at 90 degree intervals. There is only one diaphragm 14, and the diaphragm 14 is clamped between the first casing 21 and the second casing 13. The disc-shaped sheet 24 is provided with four legs 25 rising from its outer peripheral edge, and the tips of the legs 25 are bent to form an abutting part that contacts the plate 22 from inside the plate 22. 26. The contact portion 26 of the foot portion 25 is connected to the plate 2
By being inserted through the notch 23 of No. 2 and rotated by a predetermined angle, it comes into contact with the plate 22 inside the plate 22. color 27
is integrally formed with a substantially rectangular protrusion 29, and is fixed to the diaphragm 14 via the protrusion 29. Further, a substantially rectangular projection 28 formed on the collar 27 is inserted into a substantially rectangular hole 29 in the seat 24 to prevent rotation of the seat 24 and fix the positional relationship.

As can be seen from FIG. 1, in the ignition timing control device of this embodiment, the plate 22 and seat 2 shown in the figure are
The initial position is determined by the state in which the contact portion 26 of No. 4 is in contact, and S ₁ in the figure is the advance angle amount, and S ₂ in the figure is the retard angle amount.

In the above description of the configuration, the same reference numerals are used for the same components as in the configuration of FIG. 5.

The ignition timing control device of the present invention is assembled as follows.

A sheet 24 is clamped between the diaphragm 14 and the collar 27. In this case, the protrusion 28 is inserted into the hole 29 and clamped.

Next, the contact portion 26 of the sheet 29 is attached to the plate 22.
, and rotate it by a predetermined angle.

Thereafter, the diaphragm 14 is caulked between the first casing 21 and the second casing 13.
This allows for assembly only from one side.

In the description of the present invention, it is sufficient that the substantially rectangular holes provided in the sheet and the substantially rectangular protrusions provided in the collar have non-circular structures.

(Effects of the Invention) According to the present invention, since assembly is performed only from one side of the casing, the assembly process is simplified.

Furthermore, the structure of the first casing is simplified.

Thread machining and screw work can be omitted.

Furthermore, adhesives and packing can be omitted.

Since the seat is provided with a non-circular hole and the collar is provided with a non-circular protrusion, rotation of the seat is prevented and there is no risk of the seat falling off during use.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing one embodiment of the present invention, FIG. 2 is a left side view of the plate in FIG. 1, and FIG.
The drawings are a left side view of the seat shown in FIG. 1, FIG. 4 is a front view of the collar shown in FIG. 1, and FIG. 5 is a sectional view showing a known ignition timing control device. 13: second casing, 14: diaphragm, 15: first spring, 18: second spring, 21: first casing, 22: plate, 23: notch, 24: seat, 25: foot, 2
6: Contact part, 27: Collar.

Claims (1)

[Scope of Claims] 1. A first casing 21 having a substantially cup-like shape, a ring-shaped plate 22 fixed inside the first casing 21 and having an insertion hole formed in the center, and a hole through which the plate 22 is inserted. A notch 23 formed on the inner periphery of the hole, a second casing 13, one diaphragm 14 clamped by the first casing 21 and the second casing 13, A sheet 24 in which a non-circular hole 29 is formed, a foot portion 25 rising from the outer peripheral edge of the sheet 24, and a notch in the plate 22 formed by bending the tip of the foot portion 25. 23 and rotated by a predetermined angle so as to come into contact with the plate 22 from inside; and a contact portion 26 provided between the first casing 21 and the sheet 24; The diaphragm 14
The first part adjusts the stroke by negative pressure acting on the
the spring 15, the collar 27, and the collar 2
7 and is fixed to the diaphragm 14 by passing through the hole 29 of the sheet 24. The projection 28 is provided between the sheet 24 and the collar 27, and the collar 27 is fixed to the diaphragm 14 by passing through the hole 29 of the sheet 24.
a second spring 18 that urges the diaphragm 14 in a direction away from the diaphragm 14 and at the same time adjusts the stroke due to positive pressure acting on the diaphragm 14, and has both advance and retard characteristics.