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Internal-combustion engine with decompressor

A technology for decompression devices and internal combustion engines, which is applied to valve devices, mechanical equipment, engine components, etc., to achieve the effect of improving switching accuracy and suppressing vibration, rotation and vibration

Active Publication Date: 2008-05-28
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, when the centrifugal load and decompression cam are installed on the camshaft, the camshaft itself is enlarged in the radial direction, and it is necessary to secure a space for the centrifugal load to swing, so the cylinder head is enlarged in the radial direction of the camshaft.

Method used

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  • Internal-combustion engine with decompressor
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  • Internal-combustion engine with decompressor

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Embodiment Construction

[0046] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6 .

[0047] 1 and 2, the internal combustion engine E to which the present invention is applied is a single cylinder reciprocating 4-stroke internal combustion engine mounted on a motorcycle as a vehicle. The air-cooled internal combustion engine E is equipped with an engine main body composed of a cylinder 1 forming a cylinder bore 1a in which a piston 5 can reciprocate and fit, a cylinder head 2 connected to the upper end of the cylinder 1, and a cylinder head 2 connected to the upper end of the cylinder head 2. The cylinder head cover 3 is connected to the lower end of the cylinder 1 and includes a crankcase (not shown) that rotatably supports a crankshaft (hereinafter referred to as "crankshaft"). A valve chamber 4 is formed by the cylinder head 2 and the cylinder head cover 3 , and the valve chamber accommodates an overhead cam type valve device 20 mounted on the internal c...

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Abstract

The present invention provides an internal combustion engine (E) provided with a decompression device, which reduces rotational imbalance of a camshaft by the decompression device and improves the opening and closing accuracy of engine valves by the valve cam. It includes: a centrifugal load (41) swingably supported on the camshaft of the valve device (20), a decompression device (D) having a decompression cam (43) driven by the swinging centrifugal load (41) . The decompression cam (43) occupies the decompression position where the engine valve is opened during the compression stroke in which the compression pressure in the combustion space should be lowered when the centrifugal load (41) occupies the low-speed side position when the engine is started, and the centrifugal load (41) ) After the engine that occupies the high-speed side position is started, it occupies the decompression release position that does not open the engine valve. A balance load (60) for reducing rotational imbalance of the camshaft caused by a centrifugal load (41) occupying a high-speed side position is provided on the camshaft. The balance load (60) is composed of a plurality of load portions (61, 62, 52e) spaced apart from each other in the axial direction of the camshaft (C).

Description

technical field [0001] The present invention relates to an internal combustion engine provided with a decompression device which lowers the compression pressure at startup and facilitates startup. Background technique [0002] A known decompression device for an internal combustion engine has: a centrifugal load swingably supported on a camshaft of a valve device for opening and closing an intake valve and an exhaust valve, and a decompression cam driven by the centrifugal load swinging under the action of centrifugal force, The engine valve switched by the decompression cam is driven to open by the decompression cam during the compression stroke, thereby reducing the compression pressure in the combustion space, thereby reducing the load on the starting device. (For example: refer to Patent Document 1) [0003] Patent Document 1: JP-A-2004-360538 [0004] However, since the centrifugal load of the decompression device is arranged so as to have a center of gravity at an ec...

Claims

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Application Information

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IPC IPC(8): F01L13/08
Inventor 久保田良河野直树佐藤岳久
Owner HONDA MOTOR CO LTD
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