Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,...
Patent
1992-09-23
1994-01-25
Bui, Thuy M.
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
474134, F16H 700
Patent
active
052811883
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a belt transmission in an internal combustion engine for driving at least one accessory device and more particularly to the arrangement and support of the belt, for easing its installation and removal while maintaining its effective drive capability.
STATE OF THE ART
In internal combustion engines, use is made of a number of different accessory devices for the engine, which devices are driven by the engine. In internal combustion engines for use in vehicles, these accessory devices can consist, for example, of a generator, an AC compressor, a cooling water pump and a steering servo pump. Driving of such accessory devices is usually brought about with the aid of a belt transmission at one end, usually a front end, of the engine, a belt pulley, which is connected firmly to the crankshaft of the engine, driving via one or more drive belts a belt pulley on each accessory device. At the same end of the engine, there can also be arranged drive transmissions for camshafts, a lubricating oil pump, any balancer shafts, any supercharging compressor and like of the engine. These transmissions, in the event that these accessory devices need to be synchronised with the crankshaft of the engine, are usually designed as gearbelt transmissions, chain transmissions or gearwheel transmissions.
As a result of a number of different accessory aggregates thus being driven by the crankshaft of the engine at one end of the engine, the problem of finding room for all these units arises. This problem is especially obvious in engines for use in passenger cars and where the engine is arranged in the transverse direction of the vehicle. In this connection, the width of the vehicle limits the possibilities of allowing the dimensions of the engine to extend too far.
A further problem is that in the event that all accessory devices are driven by a single drive belt and this breaks, all drive to the remaining accessory devices also stops. Making use of a single drive belt also means that said drive belt is subjected to high stresses since it must in total transmit relatively great forces. Increased forces in the drive belt mean that correspondingly high forces come to act on the bearings and attachments of the accessory aggregates.
As a solution to the abovementioned problem, it is already known to arrange transmissions for driving accessory devices also at the other end, usually a rear end, of the engine.
According to a solution which is described in greater detail in patent specification U.S. Pat. No. 4,558,668, use is made of a gear ring fixed to the flywheel of the engine for driving a drive belt, which drive belt drives a belt pulley connected to a power take-off shaft. The same gear ring is used on starting for interaction with a starter motor pinion. In order that in this connection the starter motor pinion should not act on the drive belt, the starter motor is arranged along a part of the gear ring which is not covered by the drive belt. A disadvantage of this design is that the gear ring is arranged to be engaged around by the drive belt. In the event of any drive belt exchange, the possibility must be created of mounting the drive belt. In a vehicle engine, in which clutch and gearbox are directly connected to the flywheel, this means that, for example, the entire clutch must be demounted if a non-divisible drive belt is used. An alternative is to use a drive belt which can be opened, or separated along its length but this then means instead that a more complicated drive belt must be used.
The abovementioned disadvantages have meant that, at least in internal combustion engines for use in passenger cars and at least to any extent worth mentioning, no solution has come into practical use, which uses the flywheel of the engine for driving accessory aggregates.
AIM OF THE INVENTION
The aim of the present invention is to make possible a solution for driving accessory devices on the flywheel of the engine, but which does not display the disadvantages which characterise known solutions. In this w
REFERENCES:
patent: 1220304 (1917-03-01), Welffens
patent: 1320044 (1919-10-01), Heaney
patent: 1869692 (1932-08-01), Horner
patent: 2456518 (1948-12-01), Iofton
patent: 4558668 (1985-12-01), Yabunaka
Bui Thuy M.
Saab Automobile Aktiebolag
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