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US 4,730,999 AGranted
Negative pressure supply apparatus for automobiles
AssigneeHitachi, Ltd.
InventorsYoshiaki Tsukuda, Akira Tomita
Life of this patent
Estimating the term…
Abstract
The vacuum tank is connected to an engine intake manifold, and a vacuum pump generates compulsarily a negative pressure so as to maintain the negative pressure at a predetermined setting pressure value. The vacuum pump has a diaphragm pump for discharging air in the vacuum tank a motor for driving the diaphragm pump. The vacuum tank pump is disposed in the vacuum tank. A vacuum switch assembly and the diaphragm pump are disposed on the vacuum tank. The motor is installed entirely in the vacuum tank. The volume of a negative pressure supply apparatus can be reduced, and the installing location of the negative pressure supply apparatus can be disposed at liberty.
Claims16
A negative pressure supply apparatus for automobiles comprising:
- a vacuum tank section being connected to an engine intake manifold;
- and a vacuum pump section for generating compulsorily a negative pressure so as to maintain the negative pressure at a predetermined setting pressure value;
- said vacuum pump section having a pump means for discharging an air in said vacuum tank section to outside of said vacuum tank section, a motor for driving said pump means, and an electric wire member being connected to said pump driving motor, wherein said vacuum pump section is disposed in said vacuum tank section;
- a vacuum switch assembly is disposed integrally on a wall of said vacuum tank section and connected between said pump driving motor and said electric wire member, said switch assembly closes so as to permit supply of an electric power to said pump driving motor when a negative pressure in said vacuum tank section is detected and approaches an atmospheric pressure exceeding the predetermined setting pressure value, and
- a connect means is disposed integrally on the wall of said vacuum tank section and connects between said vacuum tank section and the engine intake manifold.
2 more elements
A negative pressure supply apparatus for automobiles comprising:
- a vacuum tank being connected to an engine intake manifold and storing a negative pressure therein thereby the negative pressure is supplied to a control apparatus as occasion demands;
- a pressure detecting means for detecting a pressure in said vacuum tank;
- and a pump section being driven by said pressure detecting means and discharging an air in said vacuum tank into an atmosphere;
- characterized in that
- a part of said pressure detecting means and a part of said pump section are formed respectively at a wall of said vacuum tank, and thereby said pressure detecting means and said pump section are formed integrally on said vacuum tank.
2 more elements
A negative pressure supply apparatus for automobiles comprising:
- a vacuum tank being connected to an engine intake manifold and storing a negative pressure therein, thereby the negative pressure is supplied to a control apparatus as occasion demands;
- a pressure detecting means for detecting a pressure in said vacuum tank;
- a motor-driven pump section having a motor for discharging an air in said vacuum tank to an atmosphere;
- said motor operates when a pressure detected by said pressure detecting means goes over a predetermined setting pressure value and becomes toward an atmospheric pressure, and said motor-driven pump section comprising a pump means having a diaphragm type pump mechanism;
- wherein said pressure detecting means is disposed integrally on a wall of said vacuum tank, and a connect means is disposed integrally on the wall of said vacuum tank, and connects betewen said vacuum tank and the engine intake manifold of the automobile;
- said negative pressure supply apparatus further comprising:
- a fixing means for fixing said motor-driven pump section at the wall of said vacuum tank;
- a first intake means for inhaling an air in said vacuum tank into said pump means of said motor-driven pump section;
- a first discharging means for communicating an atmosphere with an exhaust passage of said motor-driven pump section through the wall of said vacuum tank with holding an airtight sealing state between said vacuum tank and the atmosphere;
- and an electric wire member supplying an electric power to said motor of said motor-driven pump section from an outside with maintaining an airtight sealing state between said vacuum tank and the atmosphere;
- said diaphragm type pump mechanism comprises a crank mechanism being connected to a shaft of said motor, a connecting rod means being reciprocated by said crank mechanism, a pump diaphragm member being fixed to said connecting rod means;
- a header for forming an operating chamber in cooperation with said pump diaphragm member;
- a second intake means for inhaling an air in said vacuum tank into said operating chamber when the volume of said operating chamber becomes enlarged;
- and a second discharging means for discharging an air in said operating chamber into an outside of said vacuum tank when the volume of said operating chamber become decreased.
11 more elements
Dependencies are inferred from the claim text.