Oil Control Valve Mounting Base Cylinder Head Integration
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Solution Overview
Problem
Conventional oil control valve arrangements in engines face complexities in assembly, susceptibility to oil leaks and high temperature damage, interference with maintenance operations, and inefficiencies in oil pressure control due to exposed and heat-sensitive placements.
Innovation Solution
An oil control valve mounting base is positioned on the cylinder head with a coupling seat and insertion seat, spaced from the engine's high temperature areas, reducing heat accumulation and interference, and shortening the oil passage between the valve and driving mechanism for improved precision and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnetic valve is mounted atop the cylinder head with external oil tube connection, then the oil control function is achieved, but the assembly becomes complicated and the oil tube is exposed to high temperature damage
Solution Approach 1:
The patent integrates the oil control valve directly into the cylinder head structure, merging the valve body with the mounting base. The oil control valve is positioned within the rocker arm compartment rather than being externally mounted, eliminating the need for separate mounting flanges and external oil tubes. This integration simplifies the assembly by reducing the number of separate components and their associated fastening elements.
Solution Approach 2:
The oil control valve is nested within the rocker arm compartment of the cylinder head. The valve body is positioned inside the existing structural space of the cylinder head, utilizing the available internal volume rather than adding external protrusions. This nesting approach allows the oil control function to be incorporated without increasing the overall external dimensions or creating exposed external connections.
2Reliability
If the electromagnetic valve is mounted atop the cylinder head, then the oil control function is achieved, but the oil tube is exposed to high temperature and may get embrittled and damaged
Solution Approach 1:
The patent extracts the oil control valve from its conventional external position atop the cylinder head and relocates it internally within the rocker arm compartment. By taking the valve out of the high-temperature exposure zone and positioning it within the protected internal structure, the harmful thermal effects are eliminated while the oil control function is maintained through the integrated design.
Solution Approach 2:
The cylinder head structure itself acts as an intermediary protective barrier between the oil control valve and the high-temperature environment. The valve is positioned within the rocker arm compartment, using the cylinder head's internal structure as a thermal shield, thereby mediating the thermal exposure and protecting the valve from direct high-temperature damage.
3Reliability
If the electromagnetic valve is arranged atop the cylinder head, then the oil control function is achieved, but the valve interferes with components on the upper side when the engine swings
Solution Approach 1:
The patent extracts the oil control valve from its conventional external position atop the cylinder head and relocates it internally within the rocker arm compartment. This extraction from the upper external position eliminates the interference with upper components during engine swinging while maintaining the oil control function through the integrated internal design.
Solution Approach 2:
The patent transitions the oil control valve from a vertical external mounting position to a horizontal internal positioning within the rocker arm compartment. By changing the spatial dimension and orientation from external-top mounting to internal-side mounting, the valve no longer protrudes upward to interfere with other components while maintaining functional effectiveness.
4Volume of stationary object
If the oil control valve is positioned close to the cylinder head, then the assembly is compact, but heat accumulates around the valve reducing its durability
Solution Approach 1:
The patent applies local quality differentiation by positioning the oil control valve in a specific location within the rocker arm compartment that provides favorable thermal characteristics. The valve is placed in a region with better heat dissipation properties while maintaining compact overall dimensions, creating a localized optimal thermal environment for the valve without compromising assembly compactness.
Data Source
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AI summary
The present invention relates to a structure of oil control valve for variable lift of engine valve. The engine (3) at least comprises a crankcase (31), a cylinder block (32) mounted on the crankcase (31), and a cylinder head (33) mounted on the cylinder block (32). The cylinder block (32) comprises a timing chain compartment (34), which extends upward to the cylinder head (33). The timing chain compartment (34) receives a timing chain (341) mounted therein. The cylinder head (33) comprises a rocker arm compartment (35), which comprises a cam assembly (351), a rocker arm assembly (352), and a valve assembly (353) mounted therein, wherein the rocker arm assembly (352) comprises an oil-control driving mechanism (354) and the oil-control driving mechanism (354) is controlled by an oil control valve (4). An oil control valve mounting base (334) is mounted on a surface of the cylinder head (33) that is on the same side as the intake port (331). The oil control valve mounting base (334) comprises a coupling seat (3341) and an insertion seat (3342). The oil control valve (4) comprises a valve body (4a) and an insertion section (4b). The insertion seat (3342) of the oil control valve mounting base (334) receives the insertion section (4b) of the oil control valve (4) to insert therein, wherein the insertion seat (3342) of the oil control valve mounting base (334) and the cylinder head (33) are spaced from each other by a spacing distance. As such, the oil control valve (4) is set distant from the high temperature site of the engine (3) to prevent the oil control valve mounting base (334) from forming a heat accumulation object thereby improving the durability of the oil control valve (4), easing the installation of the oil control valve (4), and preventing the oil control valve (4) from interfering with the maintenance operation of other components. Further, this also helps shorten the controlling oil passage (41) between the oil control valve (4) and the oil-control driving mechanism (354) to thereby reduce loss of oil pressure and make the oil control valve (4) controlling and driving the oil-control driving mechanism (354) more precisely.