Patent application number | Description | Published |
20080237518 | HYDRAULIC PUMP - A hydraulic pump includes a housing, a seat portion, and a valve element. The housing has a compression chamber and a fluid passage. The seat portion is provided midway through the fluid passage. The valve element is located between the compression chamber and the fluid passage. The valve element is a closed-end cylindrical member having a bottom portion, a cylindrical portion, and an opening end arranged in this order. The cylindrical portion is located farther away from the seat portion than the bottom portion. The valve element is seated to the seat portion at the bottom portion. A stopper substantially closes the opening end when making contact with the opening end to regulate movement of the valve element. | 10-02-2008 |
20090097997 | FUEL PUMP - A housing has a compression chamber and a first passage, through which the compression chamber communicates with an accumulation chamber. A discharge valve is provided in the first passage and configured to open to supply fuel from the compression chamber to the accumulation chamber in response to increase in pressure in the compression chamber. A second passage is configured to communicate the accumulation chamber with the compression chamber via the discharge valve. A valve element allows fuel flow from the accumulation chamber to the compression chamber. A biasing unit biases the valve element to seat the valve element on a valve seat of the second passage. The sidewall of the valve element and the inner wall defining the second passage therebetween define a throttle midway through the second passage for restricting fuel flow from the accumulation chamber to the compression chamber. | 04-16-2009 |
20090104045 | High pressure pump having plunger - A high pressure pump draws fluid from a fluid inlet into a compression chamber through an inlet chamber. The high pressure pump has a fluid chamber that communicates with the fluid inlet via the inlet chamber. The high pressure pump includes a plunger and a cylinder. The plunger draws fluid from the inlet chamber into the compression chamber when the plunger moves in a drawing direction. The plunger is capable of pressurizing fluid in the compression chamber when the plunger moves in a pressurizing direction. The cylinder movably supports the plunger therein. When the plunger moves in the drawing direction, fluid in the inlet chamber is drawn into the compression chamber, so that fluid flows from the fluid chamber into the inlet chamber. | 04-23-2009 |
20090185922 | FUEL PUMP - A fuel pump includes a housing having therein a suction passage and a pressurization chamber into which fuel from the suction passage flows, a plunger held in the housing to be reciprocable so as to pressurize the fuel flowing into the pressurization chamber, and a diaphragm device located in a suction chamber that is provided in the suction passage. The diaphragm device includes a pair of first and second diaphragms that are arranged to define an inner space therebetween and air-tightly sealed at its entire peripheries. A mass addition member may be attached to an inside surface of at least one of the first and second diaphragms, so that the first and second diaphragms with the mass addition member have different characteristic frequencies. Accordingly, pressure pulsation of the fuel in the suction chamber can be effectively reduced by the pulsation damper. | 07-23-2009 |
20090291006 | Fuel pump having plunger and fuel supply system using the same - A delivery valve is connected to a discharge passage, through which fuel in a compression chamber is discharged. The delivery valve is screwed to a mount hole formed in the cylinder. A communication passage is formed in a body to extend through the sidewall between a screwed part in which the mount hole and the body are screwed to each other, and a gasket. A small clearance is formed between an inner peripheral surface of the mount hole and an outer peripheral surface of the body. The communication passage provides communication between a fuel passage downstream of a valve seat member and the clearance. The clearance communicates with the suction chamber through a return passage formed in the cylinder. | 11-26-2009 |
20090297375 | ELECTROMAGNETIC VALVE, FLUID PUMP HAVING THE VALVE, AND FLUID INJECTOR HAVING THE VALVE - An electromagnetic valve includes a valve body having a passage and a valve seat, a valve member engaging/disengaging from the seat to stop/allow a fluid flow through the passage, an urging member urging the valve member, a movable part reciprocating in axial direction with valve member, a connector made of magnetic material and accommodating movable part to allow its reciprocation, a stator made of magnetic material and constituting a magnetic circuit with the movable part and connector to attract the movable part, a coil generating magnetism attracting movable part to stator when energized, a terminal connected to coil for supplying power, and a resin-formed member including an accommodating member embedding the coil and terminal, and a nonmagnetic member made of nonmagnetic material and located radially inward of coil and between the connector and stator for preventing a short circuit. The accommodating member and nonmagnetic member are formed integrally from resin. | 12-03-2009 |
20090311118 | HOLDER DEVICE AND HIGH-PRESSURE PUMP HAVING THE SAME - A holder device has an elastic member and contact members. The elastic member is curved to extend approximately along a major arc of curvature and is elastically deformable to change a radius of curvature thereof. The contact members are circularly arranged along an inner circumferential side or an outer circumferential side of the elastic member so that each of the contact members is opposed to the elastic member in a radial direction of the elastic member. Each of the contact members has a sidewall that is opposed to the elastic member in the radial direction and is curved along an arc of curvature. A radius of curvature of the sidewall is shorter than the radius of curvature of the elastic member in its natural state. | 12-17-2009 |
20100047086 | Fuel pump - A housing has a compression chamber and a first passage, through which the compression chamber communicates with an accumulation chamber. A discharge valve is provided in the first passage and configured to open to supply fuel from the compression chamber to the accumulation chamber in response to increase in pressure in the compression chamber. A second passage is configured to communicate the accumulation chamber with the compression chamber via the discharge valve. A valve element allows fuel flow from the accumulation chamber to the compression chamber. A biasing unit biases the valve element to seat the valve element on a valve seat of the second passage. The sidewall of the valve element and the inner wall defining the second passage therebetween define a throttle midway through the second passage for restricting fuel flow from the accumulation chamber to the compression chamber. | 02-25-2010 |
20100074782 | High pressure pump having plunger - A high pressure pump draws fluid from a fluid inlet into a compression chamber through an inlet chamber. The high pressure pump has a fluid chamber that communicates with the fluid inlet via the inlet chamber. The high pressure pump includes a plunger and a cylinder. The plunger draws fluid from the inlet chamber into the compression chamber when the plunger moves in a drawing direction. The plunger is capable of pressurizing fluid in the compression chamber when the plunger moves in a pressurizing direction. The cylinder movably supports the plunger therein. When the plunger moves in the drawing direction, fluid in the inlet chamber is drawn into the compression chamber, so that fluid flows from the fluid chamber into the inlet chamber. | 03-25-2010 |
20100074783 | High pressure pump having plunger - A high pressure pump draws fluid from a fluid inlet into a compression chamber through an inlet chamber. The high pressure pump has a fluid chamber that communicates with the fluid inlet via the inlet chamber. The high pressure pump includes a plunger and a cylinder. The plunger draws fluid from the inlet chamber into the compression chamber when the plunger moves in a drawing direction. The plunger is capable of pressurizing fluid in the compression chamber when the plunger moves in a pressurizing direction. The cylinder movably supports the plunger therein. When the plunger moves in the drawing direction, fluid in the inlet chamber is drawn into the compression chamber, so that fluid flows from the fluid chamber into the inlet chamber. | 03-25-2010 |
20100166584 | HIGH PRESSURE PUMP - A volume chamber is formed by a valve member, an inner peripheral wall of a tubular portion and a bottom portion of a stopper when the valve member is engaged with tubular portion. A communication passage communicates between the volume chamber and one of an intermediate passage of a valve body and a tertiary passage of the stopper. The communication passage is formed at a location, which is spaced from a contact surface between the tubular portion and the valve member by a first predetermined distance and is also spaced from a contact surface between the bottom portion and the first urging member by a second predetermined distance. | 07-01-2010 |
20100209274 | DAMPER DEVICE AND HIGH PRESSURE PUMP HAVING THE SAME - In a housing, a damper member is placed in a fluid chamber communicated with a pressurizing chamber, at which a plunger is reciprocated to pressurize fuel, and an opening of the fluid chamber is covered with a cover member. The damper member includes first and second-side diaphragms. A first-side support member is located between the damper member and the cover member and is engaged with a first-side outer peripheral portion of the first-side diaphragm and the cover member. A second-side support member is located between the damper member and the housing and is engaged with a second-side outer peripheral portion of the second-side diaphragm and the housing. The first and second-side support members are urged between the housing and the cover member. | 08-19-2010 |
20100215529 | DAMPER DEVICE, HIGH PRESSURE PUMP HAVING THE SAME AND MANUFACTURING METHOD OF THE SAME - Gas of a predetermined pressure, which is equal to or higher than the atmospheric pressure, is filled in a damper chamber of a damper member that includes first and second-side diaphragms. A first-side limiting portion of a first-side cover member and a second-side limiting portion of a second-side cover member are engageable with a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm, respectively, to limit bulging of the damper member when a pressure of a fluid chamber is equal to or less than the predetermined pressure. | 08-26-2010 |
20110110807 | HIGH-PRESSURE PUMP - A fuel gallery has an inlet opening through which a fuel is introduced therein and a suction opening through which the fuel flows between the fuel gallery and a compression chamber. A pulsation damper is supported in the fuel gallery by a first and a second supporting member. The second supporting member defines an inner fuel chamber and outer fuel chamber which communicates with each other through apertures. The suction opening is located at a side wall of the fuel gallery and the inlet opening is located at a bottom wall of the inner fuel chamber which is defined radially inside of the second supporting member. The fuel discharged into the outer fuel chamber through the suction opening is introduced into the inner fuel chamber through the apertures. A flow velocity of the fuel is decreased and a pressure pulsation reduction effect of the pulsation damper is surely achieved. | 05-12-2011 |
20110110808 | HIGH-PRESSURE PUMP - An extended passage of a press-side passage is supposed in a fuel gallery. This supposed extended passage of the press-side passage extends toward a lid member. The press-side passage is opened at the side wall of the fuel gallery. A center axis of the press-side passage is inclined in such a manner that a fuel returning from the press-side passage to the fuel gallery flows toward the lid member. A bottom-side fringe of a damper unit does not exist in the supposed extended passage. | 05-12-2011 |
20110110809 | HIGH PRESSURE PUMP - A fuel gallery has a first opening port communicated to a variable volume chamber formed at a lower side of a plunger and a second opening port communicated to a fuel pressurizing chamber formed at an upper side of the plunger. A connecting tube member is provided in the fuel gallery for communicating the first and second opening ports with each other. During a fuel amount adjusting stroke, for example, in which the plunger is moved in an upward direction, a part of excessive fuel from the fuel pressurizing chamber is supplied to the variable volume chamber through the connecting tube member and the remaining part of the excessive fuel is discharged from the connecting tube member into the fuel gallery through a communication through-hole formed in the connecting tube member. | 05-12-2011 |
20110125387 | FUEL SUPPLY SYSTEM HAVING PRESSURE CONTROL VALVE - A pressure control valve is provided in a fuel return pipe connected between a high pressure fuel pipe and a fuel pressurizing chamber of a high pressure pump. A pressure relief valve is opened when fuel pressure in a fuel delivery pipe is higher than a first pressure. A first valve body of the pressure relief valve is brought into contact with a stopper so that a movement of the first valve body is limited. A pressure holding valve, which is provided in an inside of the first valve body, is opened when the fuel pressure in the fuel delivery pipe is larger than a second pressure. When the pressure relief valve is opened and the first valve body crashes into the stopper, a lifting amount of a second valve body of the pressure holding valve is increased by inertia of the second valve body, so that extraneous material attached to the second valve body can be removed. | 05-26-2011 |
20110139126 | HIGH-PRESSURE PUMP - A high-pressure pump for supplying fuel to a fuel rail includes a pressurizing unit, a discharging unit, a return flow channel, a mechanical pressure relief valve, a cup-like shaped spring seat, and a constant residual pressure valve. The return flow channel is closed when pressure of fuel in the fuel rail becomes equal to or less than a predetermined pressure. The spring seat has a guide portion that is formed along an outer shape of a constant residual pressure valve element of the constant residual pressure valve such that the guide portion limits a vortex flow generated at a position downstream of the constant residual pressure valve element in the second flow direction. | 06-16-2011 |
20110186018 | HIGH-PRESSURE PUMP - A high-pressure pump has a metering valve and a valve stopper. The stopper has a regulation portion which an end surface of the valve is brought into contact with. An outer diameter of the regulation portion is equal to an outer diameter of the outer peripheral surface of the valve. A cylindrical sleeve is disposed around the regulation portion. When the end surface of the valve is in contact with the regulation portion, the sleeve covers a tapered surface of the valve. | 08-04-2011 |
20120288389 | VALVE DEVICE AND HIGH PRESSURE PUMP USING THE SAME - A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flows through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small. | 11-15-2012 |
20130052064 | HIGH PRESSURE PUMP - A high-pressure pump has: a plunger; a pump body; a cover member for covering the pump body and forming a fuel chamber; a pulsation damper body constructed of upper and lower diaphragms with their peripheral edge portions joined and for reducing pressure pulsation in the chamber, the upper and lower diaphragms trapping gas having a given pressure between them; an upper support member having an upper ring-shaped part and an upper support body, the upper ring-shaped part being joined to the peripheral edge portion of the upper diaphragm, the upper support body extending from the upper ring-shaped part and abutting on the cover member; and a lower support member having a lower ring-shaped part and a lower support body, the lower ring-shaped part being joined to the peripheral edge portion of the lower diaphragm, the lower support body extending from the lower ring-shaped part and abutting on the pump body. | 02-28-2013 |