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engine

A technology of engines and actuators, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., and can solve problems such as large-scale engines

Active Publication Date: 2017-04-12
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actuator is mounted on the cylinder head and cylinder head cover via the mounting plate, so there is a problem of increasing the size of the engine

Method used

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Examples

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Embodiment Construction

[0033] Hereinafter, the engine 1 according to the embodiment will be described with reference to the drawings. The engine 1 according to the present embodiment is a water-cooled single-cylinder engine. figure 1 is a sectional view of a part of the engine 1 . Such as figure 1 As shown, an engine 1 includes a crankshaft 2 , a crankcase 3 , and a cylinder unit 4 . The crankcase 3 accommodates the crankshaft 2 . The cylinder unit 4 includes a cylinder block 5 , a cylinder head 6 , and a cylinder head cover 7 . The cylinder block 5 is connected to the crankcase 3 . The cylinder block 5 may be integrated with the crankcase 3, or may be separated. The cylinder block 5 accommodates a piston 8 . Piston 8 is connected to crankshaft 2 via connecting rod 9 .

[0034] In addition, in the present embodiment, the direction from the cylinder head 6 toward the head cover 7 in the direction of the cylinder axis line Ax1 of the cylinder block 5 is referred to as "the head cover side". In...

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Abstract

The actuator presses the switching pin member in the axial direction of the camshaft to switch the position of the switching pin member between the first position and the second position. At least a part of the switching pin member overlaps the cylinder head cover when viewed in the axial direction of the camshaft. The actuator is arranged on the side opposite to the cam chain chamber with respect to the camshaft in the axial direction of the camshaft. The actuator is arranged outside the engine. The actuator is located closer to the cylinder head cover than the end of the cylinder head.

Description

technical field [0001] This invention relates to engines. Background technique [0002] There is known a variable valve drive mechanism in which the connection and non-connection of rocker arms can be switched by directly pressing pin members connecting a plurality of rocker arms with an actuator. For example, in the engine described in Japanese Laid-Open Patent Publication No. 2012-77741, the drive shaft of the actuator is arranged on the fitting surface between the cylinder head and the cylinder head cover. The actuator is mounted on the cylinder head and cylinder head cover. In addition, the rod driven by the actuator and pressing the pin member is arranged to penetrate the cylinder head and is supported by the cylinder head. [0003] In the above-mentioned engine, by adopting a configuration in which the pin member is directly pressed by the actuator, the variable valve train can be realized by a simple mechanism. In addition, there are fewer and smaller components to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B75/00F02B67/10
CPCF01L1/267F01L13/0036F02B75/16F01L2001/0535
Inventor 永井良卓山本健介
Owner YAMAHA MOTOR CO LTD
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