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Engine of spark ignition type

A spark ignition type engine technology, applied in engine components, engine control, combustion engine, etc., can solve problems such as difficult to improve exhaust performance, output performance, fuel consumption performance, insufficient fuel gasification, etc.

Active Publication Date: 2006-07-26
KUBOTA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the injected fuel is insufficiently vaporized
This makes it difficult to improve various performances such as exhaust performance, output performance, and fuel consumption performance.

Method used

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  • Engine of spark ignition type
  • Engine of spark ignition type
  • Engine of spark ignition type

Examples

Experimental program
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Embodiment Construction

[0088] Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 to Figure 5 A spark ignition engine according to an embodiment of the invention is shown. In this embodiment, a spark ignition type water-cooled vertical two-cylinder gasoline engine will be described.

[0089] An overview of embodiments of the invention follows.

[0090] Such as Figure 4 As shown, the cylinder head 1 is assembled to the upper part of the cylinder block 15 . A top cover 16 is fitted to the upper portion of the cylinder head 1 . An oil pan 17 is fitted to the lower portion of the cylinder block 15 . A gear case 18 is fitted to the left portion of the cylinder block 15 . A belt case 19 is fitted to the left portion of the gear case 18 . The cooling fan 20 is provided on the left side of the belt case 19 . A flywheel 26 is provided on the right side of the cylinder block 15 . A throttle body 7 is fitted to the rear of the cylinder he...

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PUM

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Abstract

The invention discloses a spark ignition engine which injects fuel from an injector (3) into an intake port (2) provided in a cylinder head (1). In the spark ignition engine, the injector (3) has a plurality of fuel injection holes facing the inner wall surface of the intake port (2), and makes the initial point (3a) of fuel injection in a plurality of cylinders (5 and 6) During the exhaust stroke of each cylinder. The injected fuel is adapted to collide with the inner wall surface of the intake port (2). Preferably, the initial point of fuel injection (3a) is during the second half of the exhaust stroke of each of said plurality of cylinders (5 and 6). More preferably, the initial point (3a) is during the period of crank angle 31° to 25° before the end of the exhaust stroke.

Description

technical field [0001] This invention relates to a spark ignition engine, and more particularly to a spark ignition engine capable of accelerated gasification of injected fuel. Background technique [0002] As an example, a conventional spark ignition engine injects fuel from an injector into an intake port provided in the cylinder head, as does the present invention. [0003] The advantage of this engine is that it can obtain a more accurate air-fuel ratio air-fuel mixture than a carburetor, and can obtain excellent exhaust performance and output performance. [0004] However, a conventional engine directs the fuel injection hole of the injector to the intake valve port and starts fuel injection during the intake stroke of the cylinder. The injected fuel, together with the intake air, passes through the intake valve port and flows into the combustion chamber. [0005] The conventional art described above has the following problems. [0006] [Problem] Injected fuel may no...

Claims

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Application Information

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IPC IPC(8): F02M69/00
CPCF02B2275/16Y02T10/44F02D41/345Y02T10/123F02M61/1806F02M69/044Y02T10/12Y02T10/40F02M51/00F02M69/00
Inventor 井上裕史
Owner KUBOTA LTD
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