Valve driving means for V-type engine of vehicle

a technology of v-type engines and driving means, which is applied in the direction of valve driving, valve details, valve arrangement, etc., can solve the problems of significantly increasing and affecting the overall length of the engin

Inactive Publication Date: 2002-07-23
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of two such positioned camshafts, however, gives rise to certain problems in connection with the driving of the camshafts.
The mechanism for driving the camshafts in timed relationship with the crankshaft can add significantly to the overall length of the engine and present certain problems in connection with servicing.
These problems are somewhat magnified when the camshafts are driven by rubber belts rather than chains.
When belt driven, the driving belt is normally positioned externally of the engine and this can significantly add to the length of the engine.
With the present emphasis toward compact engine compartments for vehicles, this can give rise to certain problems.
In addition, the transverse positioning of engines in some vehicles can further complicate this problem, particularly when the engine is juxtaposed to the suspension system of the associated driven wheels.
The positioning of these belts in addition to the timing belts can give rise to further spacial problems and also can unduly complicate the servicing of individual belts of the engine.

Method used

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  • Valve driving means for V-type engine of vehicle
  • Valve driving means for V-type engine of vehicle
  • Valve driving means for V-type engine of vehicle

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Embodiment Construction

In the drawings, a motor vehicle powered by an internal combustion engine constructed in accordance with an embodiment of the invention is shown partially and is identified generally by the reference numeral 11. The engine constructed in accordance with the invention is identified generally by the reference numeral 12 and is positioned so as to extend transversely to the longitudinal axis of the motor vehicle 11. The engine compartment of the vehicle 11 is defined in part by means of a pair of wheel wells 13 that accommodate front wheels 14 of the vehicle 11. The front wheels 14 are suspended by means of a pillar type suspension and the wheel well accommodations for this suspension are identified by the reference numeral 15. The engine 12 is mounted between the wheel wells 13 by means including a subframe assembly 16 and is disposed, as will become apparent, with the rotational axis of its output or crankshaft extending transversely of the vehicle 11.

The engine 12 is of the V-type a...

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Abstract

A driving arrangement for a motor vehicle having a transversely disposed V-type four camshaft internal combustion engine. The camshafts are all driven in timed relationship with the crankshaft with a first flexible transmitter being operative to drive the intake camshafts of each cylinder bank at the same end of the engine from the crankshaft. The exhaust camshafts of each bank are driven by the intake camshafts at the opposite end of the engine.

Description

BACKGROUND OF THE INVENTIONThis invention relates to a valve driving means for V-type engines for vehicles and more particularly to an improved camshaft drive arrangement for such engines.In high performance engines, it is well recognized that it is desirable to provide two overhead driven camshafts for operating the intake and exhaust valves of the engine. Generally, the intake valves all lie on one side of the cylinder head and are operated by an intake camshaft and the exhaust valves all lie on the other side and are driven by an exhaust camshaft. Such an arrangement is highly favored in connection with high performance engines. The use of two such positioned camshafts, however, gives rise to certain problems in connection with the driving of the camshafts. The mechanism for driving the camshafts in timed relationship with the crankshaft can add significantly to the overall length of the engine and present certain problems in connection with servicing. These problems are somewhat...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): F01L1/02F02B75/00F02B75/22F02B67/06
CPCF01L1/02F01L1/024F01L2001/0537F02B67/06F02B75/22F02B2275/08F02B2275/18
InventorUCHIYAMA, KAZUOSUZUKI, TAKAMITSU
OwnerYAMAHA MOTOR CO LTD