JPS6211329Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double advance negative pressure device for an ignition timing control device for an internal combustion engine, and more specifically, to prevent loosening of a stopper against vibrations perpendicular (lateral) to the axial direction of the main body. It's about structure.

Since this stopper defines the second advance angle amount, it is not preferable that the set position be deviated due to vibration or the like. Therefore, a particularly vibration-resistant fixing structure is desired.

In the conventional case, this stopper was fixed as shown in FIG. That is, the first casing 3'
Center the stopper 19' on the back of the second casing 9' that is to be connected to the casing 9', and then move the opening periphery 3c' of the first casing 3' (the part indicated by the broken line in the figure) in the direction of the arrow. By clamping and press-fitting the entire circumference, this bent opening peripheral edge 3
The flange 20' of the stopper 19' is clamped and fixed between the opening peripheral edge 9c' of the second casing 9' and the opening peripheral edge 9c' of the second casing 9'. However, in the case of this conventional structure, the outer peripheral surface of the annular protrusion 19a' of the stopper 19' that comes into contact with one of the backing plates 12' that clamps the inner peripheral part of the second membrane 11', and the backing plate 12' In some cases, the inner peripheral surface of the bent peripheral edge 12a' may violently collide with the inner circumferential surface of the bent peripheral edge 12a' due to lateral vibration, and the impact may cause the stopper 19' to loosen, rotate, or in extreme cases fall off. There was a problem.

The present invention was devised to solve the above problem, and aims to provide a double advance negative pressure device equipped with a stopper fixing structure that does not loosen due to lateral vibrations. This is the purpose.

This will be explained in detail below with reference to the figures.

In the double advance negative pressure device according to the present invention shown in FIG. 1, a first membrane 2 defining a first chamber 1 is installed in a first casing 3. This first film 2 has its inner circumference connected to the backing plate 5 of the rod 4.
and a front plate 6 fitted to the rod 4, and the shaft head of the rod 4 is clamped and fixed by pressure welding. The outer circumferential portion of the first membrane 2 is sandwiched between the flanges 3a and 3b of the first casing 3 which is divided into front and rear parts, and is fixed by winding one flange 3b. The base end of the guide 7 is further wound and fixed to the front plate 6, and one spring washer 8 is fitted on the outer periphery of the guide 7 to define a second advance amount between it and a stopper to be described later. It matches.

Next, a second membrane 11 defining a second chamber 10 is installed in the second casing 9 which is to be connected to the first casing 3 . This second film 11 is
The inner peripheral portion thereof is sandwiched between the backing plate 12 and the front plate 13, and the cylindrical portion 14a of the other spring washer 14 is press-fitted into the cylindrical portion 13a of the front plate 13, thereby fixing it. Further, the outer peripheral part of the second membrane 11 is connected to the flange 9a of the second casing 9, which is divided into front and rear parts.
It is held between the two flanges 9b and fixed by winding one flange 9a. A guide receiver 15 is further fixed to the center of the spring washer 14 and the front plate 13, and the guide receiver 15 engages with the tip of the guide 7 in a hooked state, and a spring 16 is interposed between the spring washers 14 and 8. I am wearing it. Further, a spring 17 is interposed between the front plate 13 and the second casing 9, and the spring 16
is opposed to.

As shown in FIG. 2, an appropriate number of engagement pieces 18 are provided in an annular shape on the opening periphery 9c of the second casing 9 on the connection side.

Next, the outer circumferential surface of the annular protrusion 19a of the stopper 19 is press-fitted into the inner circumferential surface formed by these engaging pieces 18 and fixed, and further, as shown in FIG. Notch groove 20a
The opening peripheral edge 3c of the first casing 3 is clamped and fixed to the flange 20 over the entire circumference as in the conventional case. Then, the flange 20 of the stopper 19 is held between the back surface of the second casing 9 and the opening periphery 3c which is clamped and press-fixed in this way, and the opening periphery is inserted into the notch groove 20a of the flange 20. Part 3c
partially bites into the stopper 19, so that the annular projection 19a and the engagement piece 18 are press-fitted together, and the stopper 19 is clamped between the opening periphery 3c of the first casing 3 and the back surface of the second casing 9 relative to the flange 20. Fixing and notch groove 2 of the flange 20
It is firmly fixed by a triple fixing means that prevents rotation by partially biting the opening peripheral edge 3c into the opening 0a.

Therefore, according to the present invention, the stopper 19 can be firmly fixed, and even when subjected to lateral vibration, the outer circumferential surface of the annular protrusion 19a remains within the inner circumferential surface of the bent circumferential edge 12a of the backing plate 12. There will be no collision, and even if there is a collision, it will be held in place by the triple fixing means as mentioned above.
There is no possibility of loosening or rotation.
Therefore, the vibration resistance of the stopper 19 according to the present invention is significantly improved. In addition, centering of the stopper 19 with respect to the second casing 9 can also be done extremely easily.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the double advance negative pressure device according to the present invention, Fig. 2 is an enlarged plan view of the main part of the second casing, Fig. 3 is a longitudinal sectional view of Fig. 2, and Fig. 4 is a longitudinal sectional view of the double advance negative pressure device according to the present invention. A plan view of the stopper, Fig. 5 is a vertical sectional view of Fig. 4, and Fig. 6 is a plan view of the stopper.
The figure is an explanatory diagram showing a conventional stopper fixing structure. 3: first casing, 9: second casing, 1
8: Engagement piece, 19: Stopper, 20: Flange,
20a: Notch groove.

Claims (1)

[Scope of utility model registration request] In the double advance angle negative pressure device, a second casing is connected to the first casing, and a stopper that defines a second advance amount is sandwiched between the first casing and the second casing. An appropriate number of notched engagement pieces are provided on the peripheral edge of the opening of the stopper, and the outer circumferential surface of the annular protrusion of the stopper is press-fitted into the inner circumferential surface formed by these engagement pieces. A notch groove is provided, and when the opening periphery of the first casing is clamped and press-fitted to the flange over the entire circumference, the opening periphery partially bites into the notch groove. A double advance negative pressure device for ignition timing control devices for internal combustion engines.