Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Reexamination Certificate
1999-11-04
2002-05-14
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
C192S10900B
Reexamination Certificate
active
06386981
ABSTRACT:
The invention relates to a one-piece component as well as to a method for its manufacture, more particularly for fixing on a crankshaft of an internal combustion engine wherein the component has at least one axially formed mounting for a ring-shaped component which is to be attached centred at a later time, the component is made by means of a cold forming process and the component has in the area of the mounting surface a radially formed stop shoulder.
Components of this kind are described many times in prior art and normally represent a flywheel mass which is fixed on the crankshaft, with an axial seat onto which a starter ring gear is drawn, with a radially aligned stop shoulder. To ensure centring of the starter ring gear the centred mounting is formed by removing some stock material. This leads to an increase in the manufacturing costs and production times since the component has to be mounted in various machines and processed.
The object of the invention is therefore to provide a cost-effective and correspondingly simple to manufacture component as well as a manufacturing method suitable for this where the component is made without stock removal.
This is achieved in that a one-piece component is made by means of a cold forming process with an axially oriented mounting surface for subsequent attachment and centring in position of a ring-shaped component, and a radially oriented shoulder formed from a material accumulation formed radially outside during forming of the axially oriented mounting surface.
The axial mounting surface can be formed by at least one and preferably several circumferentially spaced circular recesses or circumferentially through the formation of a ring-shaped mounting surface. Consequently the radially designed stop shoulder can also be made from individual material thickenings or accumulations in the radial direction spread out over the circumference or can form a substantially circumferential stop. At certain angular regions of the shoulder circumference which are subject to additional imprinting steps before or after the method of the invention, the formation of the stop shoulders can be omitted through a lack of material. Preferably a starter ring gear and/or ignition marker ring is drawn onto the resulting contact bearing surface and this ring can then be welded, caulked and/or shrink-fitted thereon.
It can equally be advantageous to provide corresponding contact bearing surfaces in addition or as an alternative for mounting a flywheel mass or a bearing, such as for example a rolling or sliding bearing, for mounting a flywheel mass on the component. It can also be advantageous to provide a contact bearing surface for the centred fitting of the crankshaft.
To fix the ring-shaped component on the contact bearing face so that it is secure against tilting it can be advantageous to make the axial dimension of the mounting surface at least half the axial dimension of the ring-shaped component which can be attached so that it can be possible to fix the ring-shaped component by press-fit onto the contact bearing face of the one-piece component without further connection measures such as for example welding.
Further advantageous developments of the one-piece component can be for example a flywheel to be fixed on the crankshaft or an axially elastic and circumferentially rigid drive plate as well as a flywheel disc part of a divided flywheel.
Thus for example the one-piece component can be a primary part with a flywheel mass and this primary part can be rotated relatively against at least one secondary part which can be connected for engagement and disengagement with a gear input shaft having a flywheel mass, against the action of a damping device acting at least in the circumferential direction in the force flow between the primary and secondary part. In an advantageous development the one-piece component then forms the complete primary flywheel disc part of the divided flywheel or in a further advantageous embodiment only the bearing flange which is connected to the crankshaft through the centred bearing face. The primary flywheel disc part can then be connected to the bearing flange by means of rivets for simple assembly and to reduce the number of rivets.
Axially formed nipples can be imprinted by the cold forming technique in one of the two parts which are to be riveted and the nipples can engage in corresponding openings in the other part and be riveted at their end sides to the edges of the openings. Through the high forces which occur during the riveting process it may happen that the centring of the bearing flange provided in the bearing flange for mounting on the crankshaft becomes impaired, for example compressed.
It is therefore advantageous to provide the openings in the bearing flange and the nipples in the flywheel disc part and to design the openings so that at least three noses are formed evenly spread out over the inner circumference of the openings and aligned radially inwards with the nipples provided in the primary flywheel disc being riveted to the noses. Advantageously the alignment of the noses is such that none of the noses is mounted on an imaginary line between each centre of the openings and the axis of rotation of the bearing flange so that in this area of the centring of the contact bearing face lying closest no compression forces appear with the material flow in the direction of the centring during riveting and thus the centring can be properly maintained.
A further advantageous embodiment of the one-piece component has, when used in a divided flywheel, the provision of a transport retaining lock wherein the primary flywheel disc part is fixed secured against rotation relative to the secondary flywheel disc part during transport or assembly.
Advantageously the transport retaining lock is placed radially between circumferentially arranged energy accumulators belonging to the damping device, and a mounting of the primary flywheel disc part on the crankshaft. Advantageously the transport retaining lock can consist of a plastics part which is snap-fitted in correspondingly recessed window-shaped openings in the primary and secondary flywheel disc parts and has a designed in break point axially between the primary and secondary flywheel disc parts.
The openings are in particular punched out in the one-piece component according to the invention which functions as a primary disc part.
Furthermore it can be advantageous to snap-fit the transport retaining lock in the form of the plastics part into a corresponding opening of a radially aligned flange part connected rotationally secured to the secondary flywheel part for biasing the energy accumulators on the secondary side and into the primary flywheel disc part. The transport retaining lock is advantageously dimensioned so that it separates completely with the initial start-up of the internal combustion engine.
In a divided flywheel having the one-piece component according to the invention this can be formed as a primary flywheel disc part so that at least one radially inwardly open chamber adapted in the circumferential direction to the extent of the energy accumulators is formed on the outer circumference out of the primary disc part and/or in connection with at least one component connected thereto. The flange part connected rotationally secured to the secondary flywheel disc part engages from radially inside through the chamber for biasing the energy accumulators with the energy accumulators housed in the chamber and the chamber being filled at least in part with lubricant for lubricating the energy accumulators.
Furthermore it can be advantageous to provide, radially inside the inner circumference of the chamber, punched-out assembly and/or ventilation bores spread out around the circumference and having a raised punched aperture whereby lubricant which may be warmed up and which during stationary periods of the crankshaft is forced radially inwards is supplied back along the profiled aperture through centrifugal force into the chamber during subsequent rotation of the cranksha
Birk Albert
Oser Reinhold
Schwenk Wilfried
Browne Lynne H.
LuK Lamellen und Kupplungsbau GmbH
Thompson Kenn
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