Metal fusion bonding – Process – Using dynamic frictional energy
Patent
1998-02-23
2000-03-14
Reichard, Lynne
Metal fusion bonding
Process
Using dynamic frictional energy
74432, 403270, 4033591, B23K 2012
Patent
active
060360771
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a shaft, for the transmission of torque, comprising first and second engagement means, which shaft in its longitudinal direction is divided into a first and a second section, wherein the first and second sections are concentrically joined to each other by means of a joint, in addition to which the first section is case-hardened and comprises the first engagement means, and the second section is tough-hardened and comprises the second engagement means. The invention also relates to a process for its manufacture.
BRIEF DESCRIPTION OF THE INVENTION
Up to now shafts which comprise a case-hardened section and a tough-hardened section have been joined to each other by a splined joint. In order to stop the sections being relatively displaced to one another in the longitudinal direction of the shaft, the splined joint has been provided with locking washers which engage in the respective sections. In a rotating shaft a precise centering of such a joint is required. With repeated torque changes, i.e. when the direction of rotation or the load changes frequently, play can appear in the splined joint which in the long term leads to a breakdown.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a shaft which has a higher strength, a more compact construction, a lowered number of constituent components and which has a lower manufacturing cost than previously known shafts which comprise two sections joined to each other.
According to the invention this is achieved with a shaft which has a friction-welded joint.
In the production of a shaft according to the invention with a first section which comprises a first engagement means in the form of, for example, cogs and teeth, the section is case-hardened in order to achieve the necessary surface hardness on the cog flanks and teeth. The sections are subsequently welded together by friction welding, whereafter the teeth are machined on a region of the second section. Subsequently the second section is induction-hardened in the region where the teeth have been produced.
As the first section has been case-hardened before the welding operation, the whole shaft does not need to go through a relatively expensive case-hardening operation.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described below in more detail by way of some examples of embodiments with reference to the appended drawings.
FIG. 1 shows a sectioned lateral view of a shaft according to a first embodiment.
FIG. 2 shows a sectioned lateral view of a shaft according to a second embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The shaft according to FIG. 1 comprises a first and a second section 1 resp. 2, which are joined concentrically through a friction-welded joint 3. The second section 2 is substantially longer than the first section 1. The first section 1 is equipped with first engagement means which are partly formed of cogs 4 which are intended for a gear-transmission (not shown), partly of teeth 5 which are intended for a first splined joint (not shown). The gear-transmission can be a planetary gear where the first section 1 forms a sun wheel. The first splined joint can be shaped to form a joint between the first section 1 and a brake disc in a friction brake.
The cogs are placed on a peripheral surface on the first section 1 which lies at an end 6 which faces away from the second section 2. The teeth 5, which are intended for the first splined joint, are placed on the peripheral surface of the first section 1 in a region between the teeth 5 and the friction-welded joint 3.
The first section 1 is provided with a first shoulder surface 7 which lies at the end of a surface 8 which faces away from the second section 2. The first shoulder surface 7 can form an abutment surface which is mounted in bearings in said gear-transmission.
The first section 1 can also be provided with a second shoulder surface 9 which coincides with the plane in which the friction-welded joint 3 is positioned. whereby
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patent: 3658605 (1972-04-01), Tomita et al.
patent: 4180421 (1979-12-01), Joseph et al.
patent: 4599502 (1986-07-01), Khare et al.
patent: 4659005 (1987-04-01), Spindler
patent: 4768839 (1988-09-01), Spindler
patent: 5005989 (1991-04-01), Karlsson
Cottingham John R.
Reichard Lynne
Volvo Wheel Loaders AB
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