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four stroke cycle engine

A four-stroke, engine technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of adding additional processes, increasing engine complexity and extra weight, and achieving the goal of simplifying valve trains, reducing weight, and improving productivity. Effect

Inactive Publication Date: 2015-11-25
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the construction of the four-stroke cycle engine described above raises the following problem: the chain or belt required to drive the camshaft at a rate of one revolution of the camshaft for every two revolutions of the crankshaft adds not only complexity and additional weight to the engine, but also additional process of making them

Method used

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  • four stroke cycle engine
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no. 1 approach

[0080] Figure 1 to Figure 5 A four-stroke cycle engine (hereinafter referred to as an engine) 1 according to a first embodiment of the present invention is shown.

[0081] (Schematic configuration of the engine)

[0082] refer to figure 1 , The engine 1 according to the present embodiment includes a one-piece cylinder block 4 in which the cylinder head portion 2, the cylinder block portion 3 and the upper crankcase share the same casting. The one-piece cylinder block 4 is formed by a pair of in-line cylinders 8A and 8B ( figure 1 only the outside of the cylinder is shown). The lower crankcase 5 is fixed to the bottom of the monoblock cylinder block 4 . The head cover 6 covers the cylinder head portion 2 . The crankshaft 7 is supported between the lower portion of the upper crankcase of the monolithic cylinder block 4 and the lower crankcase 5 such that one end and the opposite end of the crankshaft 7 extend from the lower portion of the monolithic cylinder block 4 and ...

no. 2 approach

[0114] refer to Figure 7 and Figure 8 , Figure 7 and Figure 8 A hydraulic drive system of an engine according to a second embodiment of the present invention is shown. Each cylinder or one cylinder among the plurality of cylinders of the engine according to the present embodiment includes a separate hydraulic drive system for driving the intake valve 11 and the exhaust valve 12 . Note that the hydraulic drive system of the exhaust valve 12 is not described in this embodiment because it is basically the same as the hydraulic drive system of the intake valve 11 . In describing the hydraulic control valve 30B according to the present embodiment, the same reference numerals as used in describing the hydraulic control valve 30 according to the first embodiment are used to designate the same or similar components or portions.

[0115] The hydraulic control valve 30B according to the present embodiment differs from the hydraulic control valve 30 according to the first embodim...

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Abstract

There are output pistons 18 for opening intake valves 11, an intake cam 19 coaxial with a crankshaft 7 to actuate an input piston 22, a hydraulic control valve 20, output passageways 25A, 25B connecting the output pistons 18 to the hydraulic control valve, and an input passageway 24 connecting an input hydraulic chamber 21 to the hydraulic control valve. The hydraulic control valve has one state, which enables pressure-transmission communication between the input passageway and the output passageway 25A at least during a period for one cycle of reciprocating motion of the input piston 22, and another state, which enables pressure-transmission communication between the input passageway and the output passageway 25B at least during the period for one cycle of reciprocating motion of the input piston 22. The hydraulic control valve assumes the states alternately in every rotation of the intake cam 19.

Description

technical field [0001] This invention relates to four-stroke cycle engines, and more particularly, to four-stroke cycle engines employing hydraulic valve actuation systems. Background technique [0002] Four stroke cycle engines operating at 720 crankshaft rotations and employing hydraulic valve actuation systems are known. Such a hydraulic valve driving system is disclosed in the following Patent Document 1, namely JP-A2005-201259 (=EP1555398B1, titled "Internal combustion engine having asingle camshaft which controls the exhaust valves mechanically, and the intake valves through an electronically controlled hydraulic device"). In this known system, the intake valves of the engine have respective pumping pistons driven by respective cams on a single camshaft. Each pumping piston uses the hydraulic fluid in the pressure chamber and the valve drive piston to transmit thrust to the stem of the corresponding one of the intake valves to open the intake valve against the action ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/26F01L9/02F01L9/10F01L9/12
CPCF01L9/02F01L1/06F01L9/023F01L2001/34446F02B2075/1808F16K11/07F01L9/12F01L9/10
Inventor 大泽宏
Owner SUZUKI MOTOR CORP