JPS6016789Y2 - Ignition distributor ventilation system - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a ventilation system for an ignition distributor for an internal combustion engine.

(Prior Art) In a general ignition power distribution device for an internal combustion engine, a ventilation hole is provided in the power distribution cap or housing for releasing ozone and nitrogen oxide generated by spark discharge to the outside.

In this case, in order to prevent dust, water, etc. from entering the interior through the ventilation hole, the ventilation hole is usually made into a maze or surrounded by a dustproof cover.

As such a conventional example, for example, Utility Model Publication No. 48-254
As described in the 5th official gazette, there is a ventilation hole bent in a T-shape at the bottom of the stepped part that extends from the first cylindrical part of the main body of the power distribution unit to the second cylindrical part with a small diameter. A flat dustproof cover is fixed around the ventilation hole with screws or caulking.

(Problem to be solved by the invention) However, according to the above-mentioned conventional device, a ventilation hole bent in a T-shape is formed at the bottom of the stepped portion of the main body of the power distribution device, so the ventilation hole is The opening position is at the center of the shaft, which not only prevents sufficient ventilation from the centrifugal force generated by the rotation of the shaft, but also requires screw tightening and caulking processes to install the cover, which is complicated. Because the intersection of the T-shaped passage had to have a right-angled corner shape, ventilation air could not flow smoothly and a large exhaust volume could not be expected, and the ventilation system itself had to be shaped like a T-shape. Since it has to be shaped, there is a problem that processing becomes complicated.

Therefore, the present invention provides a sufficient ventilation effect due to the centrifugal force caused by the rotation of the shaft, allows the ventilation air to flow smoothly and can be expected to provide a large amount of ventilation, and is easy to form a labyrinth. This makes it easy to install.

(Means for Solving the Problems) Therefore, the present invention provides a main body of an ignition power distribution device having a first cylindrical portion and a second cylindrical portion having a small diameter connected to the first cylindrical portion in a curved stepped portion; The first cylindrical portion of the main body has a straight ventilation hole penetrating through the outer circumferential wall thereof, and has a U-shaped cross section having a bottom wall portion and both side wall portions, and a hole is provided at the tip of each side wall portion. a dustproof cover having claws and formed in an abbreviated shape that matches the curved outer wall from the first cylindrical part to the stepped part of the main body; grooves provided in a curved outer wall extending from the cylindrical part to the step part and into which the winter melon engages; The ventilation hole is closed with a lid provided on either one of the first cylindrical portion and the end on the second cylindrical portion side is left open, and the ventilation hole is closed between the cover and the outer wall of the main body. The present invention provides a ventilation device for an ignition power distribution device having a ventilation passage bent with respect to the ignition distributor.

(Function) As a result, the air inside the first cylindrical part of the ignition distributor main body is
Due to the centrifugal force caused by the rotation of the distributor shaft, the linear ventilation hole penetrated through the outer circumferential wall of the first cylindrical part, the outer wall of the ignition distributor body, and the curved outer wall of this body are The dust is discharged to the outside from the second cylindrical side end of the dust cover through a ventilation passage formed by bending with respect to the ventilation hole between the matching oval-shaped dust cover.

Further, the dustproof cover is attached to the power distribution device main body by engaging claws formed at the ends of both side wall portions with grooves provided in the curved outer wall of the power distribution device main body.

(Embodiment) Hereinafter, the present invention will be explained according to the embodiment shown in FIGS. 1 and 2. In FIGS. 1 and 2, an ignition distributor 1 has a housing 2 and a distribution cap 3. As shown in FIGS.

The housing 2 and the power distribution cap 3 are combined with each other to constitute the main body of the ignition power distributor 1.

As is well known, a power distribution section (not shown) for distributing high voltage power is provided inside the main body.

The housing 2 forming the main body has a cylindrical first tube portion 2.
1, a second cylindrical portion 22 having a smaller diameter than this, and a curved stepped portion 23 connecting both the cylindrical portions 21 and 22.

A straight ventilation hole 4 is provided in the outer circumferential surface of the first cylindrical portion 21 so as to penetrate therethrough.

This ventilation hole 4 is for releasing ozone and the like generated inside the power distribution device to the outside.

A dustproof cover 5, which is a main part of the present invention, is attached to the opening of the ventilation hole 4 on the outer wall of the housing 2.
A ventilation passage 6 is formed which is bent with respect to the air.

In this way, dust and water are prevented from entering the inside of the power distribution device through the ventilation hole 4.

In order to attach the dustproof cover 5, a thick band-like part 7 is formed on the outer wall of the housing 2 from the ventilated upper part of the first cylindrical part 21, beyond the stepped part 23, to just before the second cylindrical part 22. provided in the area.

Grooves 71 and 71' are provided on both sides of the thick band portion 7, respectively.

Further, a protruding portion 72 is provided at the upper end of the thick portion °7.

As shown in detail in FIGS. 3a and 3b, the dustproof cover 5 has a U-shaped cross section with a strip-shaped bottom wall 51 and both side walls 52 and 52', and is made of resin or metal with a spring action. .

The dustproof cover 5 as a whole has a shape that matches the shape of the outer wall of the housing 1 at the thick wall portion 7, that is, an L-shape in which the bent portion is an arc.

The spacing between the side wall portions 52 and 52' is approximately the same as the width of the thick wall portion 7, and claws 53.
53' is provided.

Here, the claws 53, 53' are provided over almost the entire area of the cover 5 except for a part of the upper end portion.

Note that the upper end of the dustproof cover 8, which is the opposite end of the second cylindrical part 22, is closed by the lid part 54, and the lower end, which is the end on the second cylindrical part 22 side, is left open. .

The dustproof cover 5 can be attached to the housing 1 with one touch by applying a force in the direction of arrow A to the cover 5 from the state shown in FIG.

That is, when a force is applied in the direction of arrow A, both side walls 52,
52' expands due to elasticity, and the claws 53 and 53' fit into the groove 71.
．． 71' as shown in FIG.

The installation of the cover 5 is completed when the entire claws 53, 53' are engaged with i71, 71'.

The lid portion 54 is engaged with the upper surface of the protruding portion 72 of the housing 2,
Close the upper end of the ventilation passage 6.

The dustproof cover 5 attached to the housing 2 in this way is exposed to an external force in the direction of detachment, such as an external force in the direction of the arrow in FIG. The lateral portions of the claws resist external forces in the respective directions.

Therefore, separation from the housing 2 is reliably prevented.

Of course, when the dust cover 5 is attached to the housing 2,
The second cylindrical portion 2 of the housing 2 is bent relative to the ventilation hole 4.
2 is formed.

As a result, dust and water are prevented from entering from the outside while maintaining good ventilation performance.

In the present invention, as shown in FIG. 5, the upper end of the ventilation passage 6 may be closed by a protrusion 72 provided on the housing 2, and as shown in FIG.
Even if 3.53' is divided into a vertical claw and a horizontal inner claw, the same effect can be obtained.

It is preferable for the dustproof cover 5 to have the above-mentioned oval shape in terms of prevention of separation from the housing 2 and dustproofness.

(Effects of the invention) As explained above, according to the invention, a straight ventilation hole is provided penetrating the outer peripheral wall of the large-diameter first cylindrical portion of the main body of the power distribution device, so that the rotation of the shaft is prevented. The resulting centrifugal force provides an excellent ventilation effect.

Further, a dustproof cover having a U-shaped cross section is formed into an abbreviated shape that matches the curved outer wall from the large-diameter first cylindrical part to the stepped part of the distributor main body, and the second cylindrical part of this dustproof cover The end opposite to the section is closed, and the end on the side of the second cylindrical section is left open, and a ventilation passage is formed between the cover and the curved outer wall of the distributor body, which is bent relative to the ventilation hole. Because of this shape, ventilation air flows smoothly along the curved outer wall of the main body, and not only can a large amount of ventilation be expected, but it also has the excellent effect of making it easy to create a labyrinth-like ventilation passage.

Furthermore, the dustproof cover is attached to the power distribution device body by engaging the claws formed at the ends of both side walls with the grooves provided in the curved outer wall of the power distribution device body. This not only makes it easy to attach the dustproof cover to the distributor body, but also allows the claws at the ends of both side walls of the dustproof cover, which are formed in an abbreviated shape, to be attached to the step from the first cylindrical part of the distributor body. By engaging with the groove formed in the curved outer wall, the dust-proof cover can be installed to reliably prevent it from coming off later from the distributor body, and the dust-proof cover can also be removed from the distributor body. This can be done relatively easily by removing the connection between the claw and the groove on the distributor body.
Even if the labyrinth-shaped ventilation passage becomes clogged with dust, installing a dust-proof cover allows you to directly inspect the straight ventilation holes, making inspection and repair of the ventilation passage easy. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the device of the present invention;
Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 a is a side view of the dust-proof cover, and Figure 3 is IIB-111B of the same dust-proof cover.
FIG. 4 is a sectional view equivalent to FIG. 2 showing the state before the dust cover is attached, and FIGS. 5 and 6 are sectional views showing modified examples of the device of the present invention. 2.3... Main body, 21... First cylindrical part, 22... Second cylindrical part, 23... Step part, 4... ...Ventilation hole, 5...Dust cover,
51...Bottom wall part, 52, 52'...Side wall part, 53.53'...Claw, 6...Ventilation passage, 71.71' ······groove.

Claims (1)

[Scope of utility model registration request] A main body of an ignition distributor has a first cylindrical part and a second cylindrical part of small diameter connected to the first cylindrical part in a curved stepped part, and a main body having a first cylindrical part that penetrates the outer circumferential wall of the first cylindrical part of the main body. The first cylindrical portion of the main body has a U-shaped cross section with a linear ventilation hole provided, a bottom wall portion and both side wall portions, and has claws at the tips of the both side wall portions, respectively. A dustproof cover is provided in an abbreviated shape that matches the curved outer wall extending from the first cylindrical portion to the stepped portion, and a dustproof cover is provided on the curved outer wall extending from the first cylindrical portion of the main body to the stepped portion with the ventilation hole in between. each groove in which the winter melon engages;
The end of the dustproof cover opposite to the second cylinder is closed with a lid provided on either the dustproof cover or the first cylinder of the main body, and the second cylinder is closed. A ventilation system for an ignition power distribution device, wherein the end of the main body is open, and a ventilation passage is formed between the cover and the outer wall of the main body, the ventilation passage being bent with respect to the ventilation hole.