Internal-combustion engines – Lubricators – Crankcase – pressure control
Patent
1994-11-29
1996-09-03
Solis, Erick R.
Internal-combustion engines
Lubricators
Crankcase, pressure control
123 9012, F01M 102
Patent
active
055513891
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/EP93/01175.
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic pump driven by an internal combustion engine. More particularly, the present invention relates to a hydraulic unit or system including a hydraulic pump driven by a camshaft of an internal combustion engine for providing pressure fluid to engine-compartment consumers in automotive vehicles.
A pump of this type is disclosed in German Patent Publication number DE-OS 40 33 105. According to the system disclosed by this reference an internally pressurized radial piston pump is flanged to the engine housing and has an air-flow sensor flap between the pump housing and the engine housing. The phrase "internally pressurized" means that the pressurization of the fluid occurs radially inward relative to the piston. The airflow sensor flap is provided with a central opening, through which a clutch extends that interconnects the pump motor and the drive shaft of the engine.
Undesirably, this known system requires a large number of component parts and the pump of this system necessitates a relatively large mounting space. In particular, in up-to-date automotive vehicles, it is desirable to reduce the dimensions of the units which are accommodated in the engine compartment to the greatest possible extent.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a generic hydraulic pump which requires only a reduced number of component parts, which affords greater ease of assembly and, in addition, necessitates less mounting space. This object is achieved by providing a hydraulic pump which is an externally pressurized and internally driven radial piston pump, having at least one pump piston, and which is integrated into the cylinder head of the internal combustion engine. The phrase "externally pressurized" means that the pressurization of the fluid occurs radially outward relative to the pump piston. Similarly, the phrase "internally driven" means that the mechanism which drives the piston is radially inward relative to the pump piston.
Designing a hydraulic pump as an internally driven radial piston pump, driven by an eccentric, for example, is inexpensive because a reduced number of component parts is needed, thereby diminishing the assembling effort. In addition, it is possible to use low-cost pump elements of existing series. Further, an externally pressurized pump may have short dimensions in the axial direction. The radial extension of such a pump is dictated by the number and size of the pump pistons used, both of which can be adapted to the demanded pressure fluid requirement. The attachment of the piston may be conformed to the space requirements, in particular, in case only one piston is used.
The system of the present invention permits a particularly short construction of the pump. Integrating the pump into the cylinder head of the internal combustion engine is an economy in overall size as compared to a flanged component part. More specifically, the pump is actually formed within the cylinder head, for example, by being disposed within the axial length of the cylinder head wall of the cylinder head. The cylinder head may be expediently provided with openings and chambers, which can be prepared for the incorporation of the pump elements, in only a few additional machining steps. These machining steps essentially imply the provision of bores. The operating shaft serving to drive the pump may be any desired spacer shaft of the engine, for example a shaft of the distributor drive, or a shaft of the lubrication pump drive.
According to a preferred embodiment of the present invention, the camshaft, or one of the camshafts of the internal combustion engine, is used as the drive shaft. An eccentric or a cam, possibly a valve cam, which is incorporated in the camshaft may serve as a pump drive. Since the eccentric or the cam serving as the pump drive may be arranged on the camshaft at any desired location
REFERENCES:
patent: 3645647 (1972-02-01), Ciampa et al.
patent: 4858572 (1989-08-01), Shirai et al.
patent: 4896633 (1990-01-01), Junghans et al.
M. Kahrs, "Hydroversorgungs--Systeme fur verschiedene Funktionen in PKW," O+P--Othydraulik und Pneumatik--34, No. 12, (1990).
Translation entitled "Hydraulic Unit" and marked PCT 7139.
Kahrs Manfred
Kunz Gerhard
ITT Automotive Europe GmbH
Solis Erick R.
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