FR1465818A - - Google Patents

Description

FRENCH REPUBLIC

MINISTRY OF INDUSTRY

SERVICE I INDUSTRIAL PROPERTY

PATENT

P.y. No. 44.851 International Classification:

N ° 1.465.818 F 02 f

Method and device for adjusting the spring preload of vacuum ignition regulators for internal combustion engines.

Company known as: ROBERT BOSCH G.m.b.H. resident in the Federal Republic of Germany.

Requested on January 5, 1966, at 1:45 p.m., in Paris.

Issued by decree of December 5, 1966.

(Official Bulletin of Industrial Property, No. 2 of January 13, 1967.)

(Patent application filed in the Federal Republic of Germany on January 22, 1965, under No. B 80.223, in the name of the applicant.)

The present invention relates to a method and to a device for adjusting the preload of the return spring installed in the diaphragm casing of a vacuum ignition regulator for internal combustion engines.

In known types of vacuum ignition regulators, the diaphragm casing of which is fixed to the outside of the ignition distributor casing, a diaphragm is moved away from its rest position, in opposition to a return force, by the vacuum in the engine intake manifold. The return force is exerted in this case by a spring installed in the diaphragm casing of the regulator and which presses under a slight preload on the diaphragm. By modifying the spring preload, the adjustment curve of the vacuum ignition regulator can be offset in parallel.

To compensate for the manufacturing tolerances of the vacuum ignition regulator and the ignition distributor, which have an influence in particular on the adjustment curve, the spring preload is adjusted, after fitting the vacuum ignition regulator on the crankcase. distributor, so that the adjustment characteristic is within the allowable limits.

The adjustment of the spring preload is carried out, in ignition regulators of known types, by means of adjusting screws using bolts or the like, which are then blocked in such a way that they cannot turn inadvertently.

According to the invention, the adjustment of the preliminary tension of the spring housed in the diaphragm casing of a vacuum ignition regulator is carried out in a much simpler manner by complementary deformation of the cover of the diaphragm casing.

In the simplest case, the diaphragm casing cover is pressed by its front surface into a suitable device.

The invention also extends to the characteristics resulting from the following description and the appended drawings as well as to their possible combinations.

The following description relates to the accompanying drawings showing an exemplary embodiment of the invention, drawings in which:

Figure 1 is a sectional view of a vacuum ignition regulator fitted with a diaphragm casing before the spring preload is adjusted;

Figure 2 shows the same vacuum ignition regulator after adjustment of the spring preload, the figure showing the device used for this purpose.

In Figure 1, the diaphragm casing of the vacuum ignition regulator is designated by the reference numeral 10. It consists of a bottom 11 and a cover 12 between which is held a diaphragm 13. The bottom 11, the cover 12 and the diaphragm 13 are blocked by the curved edge 14 of the crankcase 11. The front surface 15 of the crankcase cover 12 has a boss 16 in which is brazed a pipe 17 serving for the connection of a vacuum pipe , not shown in the drawing. The diaphragm 13 is reinforced in the center and on both sides by discs 18 and 19 and it is connected to an operating rod 20, the free end of which hooks onto the breaker plate of an ignition distributor. The diaphragm 13 and the casing cover 12 constitute a vacuum chamber 21 in which is housed a spring 22 subjected to a slight pre-stress and which serves as a return spring. It rests at one end against the disc 18 and at the other end in the recessed part 16 of the boss of the diaphragm casing 10.

66 2191 0 73 921 3

Price of the booklet: 2 francs

[1,465,818] - 2

As shown in Figure 2, the diaphragm casing is provided with a fixing base 23 welded to the bottom 11 so as to be able to be fixed by screws 24 on an ignition distributor 25. On the test bench of the 'distributor, the spring preload is adjusted so that the adjustment curve of the vacuum ignition regulator is within the allowable limits. For this purpose, the diaphragm casing 10 is placed in a device 26 and the front surface 15 of the diaphragm casing cover 11 is depressed in the direction of the arrow with the aid of a punch 27 until it is reached. the compression spring 22 has the necessary preload.

Of course, the invention is not limited to the embodiments described and shown above from which other embodiments and other embodiments can be provided, without thereby departing from the scope of the invention.

The invention extends to a device for implementing the above method or similar method.

RESUMED

The invention extends, in particular, to the following characteristics and their possible combinations.

1 ° Method for adjusting the preload of the return spring housed in the diaphragm casing of a vacuum ignition regulator for internal combustion engines, method characterized in that the preload of the spring is adjusted by deformation of the casing cover membrane, simple and safe process.

2 ° The front surface of the diaphragm casing cover is pushed in.

3 ° Device for implementing the above process or similar process.

Company known as: ROBERT BOSCH G.m.b.H. Vicarious :

bert & de kf.r endorsement

For sale of booklets, contact the Imprimerie Nationale, 27, rue de la Convention, Paris (15 *).