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engine valve train

A technology of transmission and engine, applied in the direction of engine components, machine/engine, valve device, etc., can solve the problems of unreliable switching, insufficient displacement of cam mechanism parts, etc., and achieve reliable switching, compact camshaft direction, and shorten the length. Effect

Inactive Publication Date: 2017-05-31
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, it is conceivable to reduce the height of the rising part of the end cam (the amount of protrusion in the direction of the camshaft) as much as possible. However, if the height of the rising part is reduced, the amount of displacement of the cam mechanism part required for switching the cam part is insufficient, which may not be reliable. Switching of the cam portion for valve opening and closing

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Embodiment Construction

[0034] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In this embodiment, a valve train of a 4-cylinder, 4-valve DOHC engine will be described as an example.

[0035] figure 1 The configuration of the exhaust side valve train according to the embodiment of the present invention is shown. This valve train is provided in a cylinder head (not shown) for the first to fourth cylinders 1. 1 ~1 4 A total of eight exhaust valves A, two each, and a return spring B biasing the exhaust valves A in the closing direction are respectively provided. In addition, the valve train includes a camshaft 2 on the upper portion of the cylinder head that moves the exhaust valves A to open against the urging force of the return spring B via the rocker arm C. In addition, in the above-mentioned valve train, the first cylinder 1 of the cylinder bank 1 side( figure 1 The right side) is called the front side, the fourth cylinder 1 4 side( figur...

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Abstract

A valve train for an engine. The switching of the valve opening and closing cam portion of the cam mechanism portion is reliably performed, and the height of the rising portion of the end face cam is reduced. The first and second lock mechanisms (45, 46) are configured so that when the cam mechanism part is displaced from the second predetermined position to one side in the camshaft direction, the first pressing member (43a) goes over the first top part (55) When the second pressing member (43b) is moving on the second top (56), the first pressing member presses the inclined portion (51a) of the first groove (51), thereby assisting the movement of the cam mechanism portion toward the above-mentioned side. Displacement, when the cam mechanism part is displaced from the first predetermined position to the other side of the camshaft direction, when the second pressing member passes over the second top, while the first pressing member is moving on the first top, the second pressing member presses The inclined portion (53a) of the third groove (53) can thereby assist the displacement of the cam mechanism portion toward the other side.

Description

technical field [0001] The present invention relates to a valve train for an engine, comprising two cam parts for opening and closing valves, which are fitted to a camshaft so as to be coupled in the rotational direction and displaceable (movable) in the direction of the camshaft. The cylindrical cam mechanism part switches the cam part for opening and closing the valve among the two cam parts for opening and closing the valve as the cam mechanism part displaces to one side or the other side in the direction of the cam shaft. Background technique [0002] Conventionally, as a valve train for an engine, there is known a device in which one valve is provided with a plurality of cam portions having different shapes at the front end, and by selecting a cam portion that opens and closes the valve from among the plurality of cam portions, This makes it possible to switch the opening amount, opening and closing timing, and the like of the intake valve and / or the exhaust valve accor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/00
CPCF01L1/185F01L13/0036F01L2013/0052F01L2013/101F01L2305/00
Inventor 高木章智小谷敏正
Owner MAZDA MOTOR CORP
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