Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydraulic circuit for internal combustion engine

a technology for internal combustion engines and hydraulic circuits, which is applied in combustion engines, valve arrangements, machines/engines, etc., can solve problems such as increasing engine size, and achieve the effects of reducing a torque increase, high responsiveness, and reducing the load of vv

Inactive Publication Date: 2017-06-08
MIKUNI CORP
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to reduce the load on a VVT ( Variable Valve Timing) and improve its responsiveness without increasing size and oil pressure. It achieves this by reducing the torque required to operate the VVT, which in turn reduces the load on the VVT. As a result, the VVT can operate more efficiently and with greater responsiveness.

Problems solved by technology

However, there is consequently caused a problem in that a capacity of the oil pump 12 is increased and a pump space is thus enlarged, resulting in an increase in a size of the engine.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydraulic circuit for internal combustion engine
  • Hydraulic circuit for internal combustion engine
  • Hydraulic circuit for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021]An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is a typical diagram showing an example of a schematic structure of a hydraulic circuit for an internal combustion engine according to the present embodiment. In FIG. 1, components having the same reference numerals as those shown in FIG. 5 have the same functions.

[0022]In FIG. 1, a first oil pump 12 sucks oil from an oil pan 11 and supplies the oil to a main gallery 14 through an oil filter 13. In other words, the oil stored in the oil pan 11 is sucked by the first oil pump 12 and is pressure fed to the main gallery 14 through the oil filter 13. Then, the oil is supplied from the main gallery 14 to various mechanism units 15, and finally drops by its own weight and returns to the oil pan 11.

[0023]Moreover, a second oil pump 21 sucks the oil from the main gallery 14 and supplies the oil to an exhaust side VVT 24 through an OCV 22. The exhaust side VVT 24 changes a ro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a hydraulic circuit including a second oil pump (21) as a dedicated pump for supplying oil pressure to a VVT (23, 24), the exhaust side VVT (24) has a rotor and a return spring for holding the rotor in a most advance angle state in stoppage of an engine. By obtaining driving force of the second oil pump (21) from an exhaust side camshaft (26) to which the rotor is connected, it is possible to reduce an increase in a torque required for operating the exhaust side VVT (24) through energizing force of the return spring.

Description

TECHNICAL FIELD[0001]The present invention relates to a hydraulic circuit for an internal combustion engine, and more particularly, is suitably used in a hydraulic circuit for an internal combustion engine including a variable valve timing mechanism for optimally controlling an open / close timing of an intake / exhaust valve depending on an operating state.BACKGROUND ART[0002]In general, an internal combustion engine (for example, a four-stroke engine to be used for a motorcycle, an outboard motor or a snowmobile) is provided with an oil pump for supplying oil from an oil pan disposed in an engine bottom portion to each mechanism unit in an upper part thereof. Specifically, oil pressure fed from the oil pump is supplied to a camshaft or a crankshaft through a cylinder head. Consequently, each mechanism unit such as the camshaft or the crankshaft is lubricated and cooled by the oil.[0003]FIG. 5 is a diagram showing a passage for oil in the engine. As shown in FIG. 5, the oil stored in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): F01L1/344F01L1/047
CPCF01L1/3442F01L2001/34423F01L2001/34483F01L1/047F02D13/0219Y02T10/12
Inventor KUSANAGI, HIDEAKI
Owner MIKUNI CORP