A four-stroke engine

一种四冲程发动机、阀驱动的技术，应用在发动机元件、燃烧发动机、发动机的润滑等方向，能够解决系统易损坏等问题

Inactive Publication Date: 2008-04-02
HUSQVARNA AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system is simple but is prone to damage when pumped into the crankcase as fuel and lubricant flow back into the carburetor and air filter, commonly known as backsplash

Method used

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  • A four-stroke engine
  • A four-stroke engine
  • A four-stroke engine

Examples

Experimental program
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Embodiment Construction

[0025] FIG. 1 shows a crankcase-scavenged four-stroke engine 1 according to the invention in a perspective view. The engine has a cylinder 2 with cooling fins 32 and spark plugs 33 . Crankcase 11 is connected below cylinder 2. The intake passage 16 is connected with the intake port (7) with the intake valve (8). A mixture preparation device 15 for proper supply of the air-fuel-lubricant mixture is provided on the intake passage 16 . The gas mixture preparation device supplies at least air 13 and lubricant 14 to the air inlet and connecting pipe 17 . This will be described more fully with reference to Figures 3A and 3B. The valve drive assembly 18 is sealed in a valve drive assembly housing 19 , 20 , 21 , 21 ′, 22 .

[0026] A passage 23 connects between the crankcase 11 and the lowermost portion 19 of the valve drive assembly housing. The second lowest portion of the valve drive assembly housing 20 is covered by a cover 34 . The top 22 of the module housing is connected ...

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PUM

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Abstract

A four-stroke reciprocating piston internal combustion engine with an intake valve an exhaust valve and a valve drive assembly driven by the crankshaft for actuating the intake valve and the exhaust valve. A mixture-preparation device supplies an air / fuel-lubricant mixture to the crankcase, which together with the piston functions as a pump for the mixture charge. A valve drive assembly housing comprising one or more sections and the intake channel is supplied with a connecting duct communicating with the crankcase volume either by being connected to the crankcase or the cylinder, or by being connected to the valve drive assembly housing, which communicates with the crankcase volume, and the communication from the intake channel to the crankcase volume is arranged through at least one valve.

Description

technical field [0001] The invention relates to a four-stroke engine. It is mainly used for portable tools such as chain saws, trimmers or power cutting tools. Background of the invention [0002] Portable tools such as chain saws or power cutting tools are used in many different operating positions, even upside down. As such, they are usually of the crankcase scavenging and lubricating type, eg feeding oil into the crankcase. This lubrication system can work in any operating position. These engines are usually of the two-stroke type, but four-stroke engines have now been proposed. [0003] US patents 4,708,107, 5,347,967, 5,579,735 and 6,145,484 and German patent 3,022,901 disclose crankcase waste oil in fuel-burning four-stroke engines. Fluid enters the combustion chamber through the intake valve through the valve drive assembly housing. This system provides good lubrication but causes the intake air to heat up considerably due to contact with very hot engine parts su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B33/26F01M3/00F02M25/06F01L3/20F02B75/02
CPCF01L3/205F02B33/26Y02T10/121F02M25/06F02B2075/027Y02T10/12
Inventor 朱塞佩·托德罗
Owner HUSQVARNA AB
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