The present invention relates to mowers comprising bottom-driven discs, more particularly those where the discs are driven by means of bevel couplings. In this type of mower the bevel couplings are housed either in a single housing extending beneath all the discs and containing a bath of lubricant, or in housings where the lubricant is in danger of escaping when the transmission shaft extending through each disc housing is withdrawn therefrom.
All these machines possess one or more of the following drawbacks:
Lengthy and delicate assembly and dismantlement both for the manufacturer and especially for the user,
Necessity of adjustment of the bevel coupling each time the transmission member passing through the disc housing must be re-fitted after repair,
Risk of oil losses, especially during repairs,
Risk of penetration of dirt into the bevel couplings and their bearings,
Risk of incorrect oil level; it is known that even a slight upward or downward variation of oil level involves grave consequences in view of the high rotation speed of the bevel couplings driving the discs,
Risk of poor lubrication of the end bevel couplings when the cutter bar is working in an inclined position, for example along a slope, and risk of deterioration of a large number of transmission members in the case of an accident to any one of them.
The purpose of the present invention is to remedy all these drawbacks.