Boots – shoes – and leggings
Patent
1993-08-18
1996-01-02
Teska, Kevin J.
Boots, shoes, and leggings
36443103, 36443108, 60276, 123198F, 123481, 123425, 731173, 731181, F02D 1702
Patent
active
054814618
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an automotive vehicle engine, and more particularly to an automotive vehicle engine provided with a cylinder suspending mechanism for suspending the working of the partial cylinders selected from the whole cylinders of the engine by means of a valve motion arrangement for the intake and exhaust of the fuel/air mixture.
BACKGROUND OF THE INVENTION
In general, an automotive vehicle engine is constructed and operated in such a manner that the maximum opening amount of the valve corresponds the maximum lift amount of the cam profile of the valve opening and closing cam and is maintained constant. Under such condition, it is difficult at the present stage to ensure optimum intake and exhaust efficiencies in the respective running modes determined depending upon revolution speed of the engine and load data including the opening degrees of the throttle valves.
More specifically, the cam profile is determined in view of the fact that the fuel/air mixture intake and exhaust efficiencies should be boosted within the range of high speed condition of the engine in order to produce an engine required to have a high output, while the fuel consumption ratio tends to be sacrificed within the range of the low speed condition of the engine.
On the other hand, the cam profile is designed to have a high fuel consumption ratio which, however, sometimes does not ensure sufficient outputs of the engine during the high speed and high load conditions.
For this reason, there have been proposed a wide variety of automotive vehicle engines each having a cylinder suspending mechanism which suspends the working of partial cylinders selected from the whole cylinders of the engine so that the fuel consumption ratios of the engine under the low revolution speed and low load conditions can be reduced and the outputs of the engine can be increased under the high revolution speed and high load conditions. This kind of engine comprises a plurality of valve opening and closing cams each having high and low speed cam profiles, a plurality of rocker arms each having a cam follower held in opposing and engaging relationship to each of the cams, and a plurality of rocker shafts fixedly supporting the rocker arms, respectively, and each having a sub-rocker arm held in engaging relationship with the valve stem of the valve. The rocker arms and rocker shafts are so constructed as to be selectively engaged with and disengaged from each other by means of plungers each slidably received in the rocker arm and the rocker shaft to be hydraulically controlled.
In the foregoing cylinder suspending mechanism, the engaging rocker arms are rocked to operate the sub-rocker arms, respectively, by way of the respective rocker shafts for opening and closing the valves. One example of such an apparatus is disclosed, for example, in the specification and drawings of Japanese Patent Application No. 2-182131 filed by the present applicant.
The known apparatus is so constructed that the opening and closing amounts of the valve can be changed by the valve opening and closing cam during low and high speed operations while the rocker :arm can be engaged with and disengaged from the rocker shaft by the plunger to enable the cylinder to be held under worked and unworked conditions.
For example, the unworked cylinders such as Nos. 1 and 4 cylinders are determined for a four-cylinder engine in advance of the unworked cylinder operation of engine. The unworked cylinder operation is determined on the basis of a running mode map selected depending upon the revolution speed and load data of the engine.
The above engine having such a cylinder suspending system encounters such a difficulty that when the all cylinder working mode having the valves opened and closed in all cylinders such as for example four cylinders held under worked conditions changed to the partial cylinder unworking mode having the valves opened and closed in the only two cylinders held under unworked conditions, the vacuumization tendency in the intake s
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International Search Report for PCT/JP92/01717 of which this application is the U.S. National phase (English Language).
Hosono Kiyotaka
Iida Kazumasa
Kishimoto Mitsuru
Miyamoto Katsuhiko
Louis-Jacques Jacques H.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Teska Kevin J.
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