DE1996759U - MAGNETIC FLYWHEEL FOR FLYING MAGNETIC IGNITORS AND FLYING LIGHT MAGNETIC FLYWHEEL FOR OPERATING COMBUSTION MACHINES. - Google Patents

Description

Ρ.Α.Η12Ί9 * -3.3.

R. 9105 Ws / Ep
5.3.1968

Species for

Utility model application

ROBERT BOSCH GMBH, Stuttgart W, Breitscheidstrasse 4

Magnetic flywheel for S chwungmagnetzünder and s S chwungli cht magnetos to operate ~ "

Internal combustion engines'' - <· \ ■ · - · +.'

The innovation concerns a magnetic flywheel for flywheel igniters and Schvninglichtmagnetzünder for the operation of internal combustion engines with a cup-shaped flywheel, the bottom of which carries the wheel hub and on the inside of which several radially magnetized magnets are attached with pole pieces and which revolves around ignition and light armatures attached to a stationary armature plate.

Robert Boson GmbH R. 91OjJ V / s / Ep

Stuttgart

In known flywheel magnet systems, the magnets are, for example Provided with a hole in the middle through which a screw from the magnetic flywheel passes and screwed into a pole piece is. Although the magnets are clamped in this way between the inside of the flywheel and their pole piece, they are ■ but weakened by the bore in cross-section, so that at mechanical stresses on this slope break kbnnsn, / This is especially true when using oxide magnets that are hard

and brittle and therefore against impact "and bending stresses very sPs ^y - parts of the

"^ ^ are sensitive. Broken magnets / magnets can then be placed between ! The pole piece and the inside of the flywheel wander out and the magneto damage or even destroy.

The innovation is based on the task of falling out of broken off Avoid magnetic pieces.

This is achieved according to the invention in that the edges of the Pöl-. shoes on the two at right angles to the circumferential direction of the flywheel *; lying sides bent at least partially towards the magnet

are. The greatest security against the wandering out of broken magnet pieces is achieved when the pole shoes are bent over their entire width on their sides lying transversely to the circumferential direction of the flywheel.

In the drawing are two examples of the innovation shown. It shows:

, Fig. 1 shows a magnetic flywheel with four oxide magnets, of which.

one is shown in longitudinal section;

'Fig. 2 shows the same magnetic flywheel rotated by 90 ° with a

Section along the line II-II in Fig. 1. In

in cross section Fig. 5 and h a part of a magnet flywheel / is shown,

whose magnets are provided with lateral grooves in which tongues bent from the pole pieces engage.

Robert Bosch GmbH H. 9103 V.'r. / Lip

Stuttgart

In Pig. 1 and 2, a cup-shaped flywheel 10 is provided with a hub 11. On its inside, four oxide magnets 12 evenly distributed over the circumference are fastened with pole shoes 13. The magnetic flywheel 10 is to be plugged with its hub 11 onto the crankshaft end of an internal combustion engine (not shown) and runs past ignition and light anchors (not shown) attached to a stationary armature plate when the machine is running at the engine speed. For fastening the Qxidmagnete 12 and the pole shoes Ij on the flywheel 10 is each a brass screw 14, which is inserted through a countersunk hole 15 in the flywheel 10 and through a hole ΐβ in the oxide magnet 12 and screwed into a thread 17 of the pole piece IJ. The oxide magnets 12 are l6 -in cross-section This weakening can possibly lead to a break in the endangered cross-sectional area visible in FIG.

To prevent broken pieces from the magnets fall out of deüi magnetic flywheel 10; are the ones when punching Edges IJa of the pole shoes 13 on their two transversely to the circumferential direction of the flywheel 10 lying sides bent over their entire width towards the magnet by about 30 °. The oxide magnets 12 themselves are on the corresponding edges of their facing the pole piece 13 End faces at 18 beveled in such a way that the bent edges 13a of the pole piece 13 only on the lateral edges of the magnets 12 issue. This prevents broken pieces of the oxide magnets 12 from falling out of the magnetic flywheel. The ab-_ Curved edges 13 a of the pole shoes 13 also contribute to the fixation and centering of the pole shoes 13 on the oxide magnets 12.

In the part of a magnetic flywheel shown in FIGS. 3 and 4, an oxide magnet 20 is also provided with a hole 21 for a brass screw 22 to pass through and is clamped between the flywheel 23 and the pole piece 24. Depending on its two transverse to the peripheral direction of the flywheel '2J sides of a longitudinal groove

Robsrt Bosch GmbH R. 9103 V / s / Ep

Stuttgart

molded into the magnet. One engages in each of these longitudinal grooves 25 cleared on the corresponding pole shoe sides and to the magnoben 20 bent tongue 26 a. When the oxide magnet 20 breaks, the fragments are held together by the tongues 26.

The innovation is not limited to the exemplary embodiments shown in the figures limited. For example, the tongues can also come from the surface of the pole shoes facing the magnets Sen. both front sides lying transversely to the circumferential direction are peeled off be. Noses that have been sewn on these front sides can also be serve to hold the magnets together. It is also possible to use the to bend four pole pieces towards the flywheel in such a way that they enclose the magnets at their four correspondingly beveled edges.

Since the magnets are often first due to mechanical overstressing before they break, they are often coated with a plastic layer before they are installed in the flywheel compensates for the unevenness of the contact surfaces between magnet and flywheel, • or magnet and pole piece and that of the flywheel on the '' Dampens vibrations transmitted by magnets. Through the plastic layer Furthermore, the formation of cracks and the breaking off of smaller pieces of the magnet on its surface are prevented by using magnets, Pole shoes and pole wheel are glued to one unit by them.

1991759

Claims (1)

Robert Bo & ch GmbH R. 910J Ws / Ep Stuttgart Expectations 1. Magnetic flywheel for flywheel magneto and flywheel magneto for the operation of pulp power machines, with a cup-shaped Pulled flywheel, the bottom of which carries the wheel hub and on the inside of which there are several radially magnetized magnets with pole pieces are attached and which revolves around ignition and light anchors attached to its fixed anchor plate, characterized in that that the edges (Ij5a) of the pole pieces (13) on the two transversely to In the circumference direction of the flywheel (10) lying sides are at least partially bent towards the magnet (12). 2. Magnet flywheel according to claim 1, characterized in that the edges (15a) of the pole pieces (15) over the entire width of the pole piece are bent towards the magnet (12). 5. Magnetic flywheel according to claim 2, characterized in that the edges (15a) of the pole pieces (15) are bent by at least 20 ° 4. Magnet flywheel according to claim 1, characterized in that the Magnets (20) on the transverse to the circumferential direction of the flywheel (25) lying sides are provided with .je one longitudinal groove (25), in each of which one sheared free on the corresponding sides of the pole shoes (24) and to the flywheel (25) bent tongue (26) engages. Robert Bosch GmbH Stuttgart R. 9103 Ws / -? 5. Magnetic flywheel according to claim Ij, characterized in that the magnets are bevelled at their four lateral edges and that corners bent from the pole pieces at the bevels the magnets are in contact. 6. Magnetic flywheel according to one of claims 1-5, characterized in that the bent towards the magnet parts of the PoI- ~) shoes are peeled off or squashed from the back of the pole chute from the front sides.