US20120244014A1 - Electromagnetic pump - Google Patents
Electromagnetic pump Download PDFInfo
- Publication number
- US20120244014A1 US20120244014A1 US13/413,234 US201213413234A US2012244014A1 US 20120244014 A1 US20120244014 A1 US 20120244014A1 US 201213413234 A US201213413234 A US 201213413234A US 2012244014 A1 US2012244014 A1 US 2012244014A1
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- United States
- Prior art keywords
- piston
- pump chamber
- cylinder
- electromagnetic
- intake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 239000012530 fluid Substances 0.000 claims abstract description 26
- 239000010720 hydraulic oil Substances 0.000 description 21
- 230000007423 decrease Effects 0.000 description 5
- 230000004323 axial length Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/048—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing around the moving part of the motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
Definitions
- the present invention relates to an electromagnetic pump including: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid.
- a past example of this type of electromagnetic pump includes: a cylinder; a piston that reciprocates inside the cylinder to change the volume inside a pump chamber; a solenoid portion that forwardly moves the piston; a spring that backwardly moves the piston; an intake check valve that allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge check valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid.
- the intake check valve and the discharge check valve are accommodated inside the cylinder.
- the intake check valve is configured from a ball; a hollow cylindrical body that accommodates the ball therein, and is formed with an axially center hole that provides communication between the intake port and the pump chamber and forms an opening portion of the intake port with an inner diameter smaller than the outer diameter of the ball; a spring that biases the ball with respect to the opening portion of the intake port in a direction opposite from the direction in which the hydraulic oil flows from the intake port; and a spring seat that receives the spring.
- the spring seat faces the pump chamber, and a surface of the spring seat on the pump chamber side also supports the spring that backwardly moves the piston.
- the piston and the intake check valve are accommodated facing one another inside the cylinder, and the pump chamber is defined by the cylinder, the piston, and the intake check valve. Therefore, how the intake check valve is configured is an extremely critical factor for determining the volume of the pump chamber and also determining the biasing force of the spring accommodated inside the pump chamber.
- An electromagnetic pump of the present invention further improves discharge performance.
- the electromagnetic pump of the present invention employs the following to achieve the above.
- An electromagnetic pump includes: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid.
- the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber.
- the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side.
- the electromagnetic pump includes: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid.
- the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber.
- the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side.
- a diameter of the projection portion on the piston side may be formed smaller than a diameter of the projection portion on the support portion side.
- the projection portion may be formed into a truncated conical shape.
- the hydraulic fluid may be discharged by the biasing member backwardly moving the piston. Since the biasing force of the biasing member exhibits less variation due to temperature compared to the electromagnetic force, the axial length of the electromagnetic pump can be shortened by using the biasing force to discharge the hydraulic fluid, and application of the present invention enables further shortening of the axial length.
- the hollow portion of the support member may be formed such that the bottom portion is more toward the piston side than a support surface of the support portion.
- the length of the support member in the axial direction can be shortened and the overall pump can be downsized.
- FIG. 1 is a structural diagram that shows the overall configuration of an electromagnetic pump 20 as an embodiment of the present invention
- FIG. 2 is a perspective view of a piston 50 and an intake check valve 60 inserted inside a cylinder 42 ;
- FIG. 3 is an exterior view that shows the exterior of a valve body 62 .
- FIG. 1 is a structural diagram that shows the overall configuration of an electromagnetic pump 20 as an embodiment of the present invention.
- the electromagnetic pump 20 of the embodiment is configured as a piston pump that reciprocates a piston 50 to pressure-feed a hydraulic oil.
- the electromagnetic pump 20 also includes a solenoid portion 30 that generates an electromagnetic force, and a pump portion 40 that operates by the electromagnetic force of the solenoid portion 30 .
- the electromagnetic pump 20 is incorporated into a valve body as a portion of a hydraulic circuit for turning on and off a clutch or a brake provided in an automatic transmission mounted in an automobile, for example.
- the solenoid portion 30 has a case 31 as a bottomed cylinder member on which an electromagnetic coil 32 , a plunger 34 as a movable element, and a core 36 as a fixed element are disposed. Applying a current to the electromagnetic coil 32 forms a magnetic circuit in which magnetic flux circles the case 31 , the plunger 34 , and the core 36 , whereby the plunger 34 is suctioned and presses out a shaft 38 that is in contact with a proximal end of the plunger 34 .
- the pump portion 40 includes: a hollow cylindrical cylinder 42 that is joined to the solenoid portion 30 ; the piston 50 that is slidably disposed inside the cylinder 42 , and has a base end surface that is coaxial with and contacts a proximal end of the shaft 38 of the solenoid portion 30 ; a spring 46 that contacts a proximal end of the piston 50 , and applies a biasing force in a direction opposite from the direction in which the solenoid portion 30 applies an electromagnetic force; an intake check valve 60 that supports the spring 46 from a side opposite from the proximal end surface of the piston 50 , and allows the hydraulic oil to flow in the suctioning direction toward a pump chamber 41 and prohibits the hydraulic oil from flowing in the reverse direction; a discharge check valve 70 that is embedded in the piston 50 , and allows the hydraulic oil to flow in the discharging direction from the pump chamber 41 and prohibits the hydraulic oil from flowing in the reverse direction; a strainer 47 that is disposed upstream of the intake check valve 60 , and catches foreign
- Spiral grooves are formed in the circumferential direction on an inner circumferential surface of the cylinder cover 48 and an outer circumferential surface of the opening portion 42 a of the cylinder 42 . Threadedly fastening the cylinder cover 48 with the opening portion 42 a of the cylinder 42 attaches the cylinder cover 48 to the opening portion 42 a of the cylinder 42 .
- an intake port 49 for suctioning the hydraulic oil is formed at an axial center of the cylinder cover 48
- a discharge port 43 for discharging the suctioned hydraulic oil is formed in a side surface of the cylinder 42 .
- the piston 50 is formed from a cylindrical piston body 52 , and a cylindrical shaft portion 54 b that has an outer diameter smaller than the piston body 52 and an end surface that contacts the proximal end of the shaft 38 of the solenoid portion 30 .
- the piston 50 moves in association with the shaft 38 of the solenoid portion 30 and reciprocates inside the cylinder 42 .
- a cylindrical, bottomed hollow portion 52 a that can accommodate the discharge check valve 70 is formed at an axial center of the piston 50 .
- the hollow portion 52 a of the piston 50 runs from a proximal end surface of the piston 50 to inside the piston body 52 , and extends to partway inside the shaft portion 54 .
- two through holes 54 a, 54 b that intersect at a 90-degree angle in the radial direction are formed in the shaft portion 54 .
- the discharge port 43 is formed around the shaft portion 54 , and the hollow portion 52 a of the piston 50 is provided in communication with the discharge port 43 through the two through holes 54 a, 54 b.
- the intake check valve 60 includes: a valve body 62 that is fitted by insertion to an inner circumferential surface of the opening portion 42 a of the cylinder 42 , formed therein with a bottomed hollow portion 62 a, and formed with a center hole 62 b that provides communication between the hollow portion 62 a and the pump chamber 41 at an axial center of the bottom of the hollow portion 62 a; a ball 64 ; a spring 66 that applies a biasing force to the ball 64 ; and a plug 68 that is fitted by insertion to an inner circumferential surface of the hollow portion 62 a with the ball 64 and the spring 66 incorporated into the hollow portion 62 a of the valve body 62 .
- FIG. 2 is a perspective view of the piston 50 and the intake check valve 60 inserted inside the cylinder 42
- FIG. 3 is an exterior view that shows the exterior of the valve body 62
- the valve body 62 is formed from a stepped structure that includes a cylindrical base portion 63 a and a truncated conical projection portion 63 b that projects from a seat surface of the base portion 63 a.
- the base portion 63 a On a circumferential edge portion of the seat surface, the base portion 63 a has a ring-shaped surface that supports the spring 46 . The height of the seat surface is adjusted to allow spring spacing for realizing a required biasing force.
- the projection portion 63 b is formed so as to project inside the pump chamber 41 , and the projecting height and diameter are adjusted such that the volume inside the pump chamber 41 becomes a volume for realizing a required discharge pressure.
- the valve body 62 adjusts the biasing force of the spring 46 and the volume of the pump chamber 41 using the base portion 63 a and the projection portion 63 b.
- the hollow portion 62 a formed inside the valve body 62 runs through an axial center inside the base portion 63 a from a back surface of the base portion 63 a, and extends to the vicinity of a proximal end inside the projection portion 63 b, with the ball 64 , the spring 66 , and the plug 68 incorporated in that order inside the hollow portion 62 a .
- the intake check valve 60 can thus be made compact because the axial length of the valve body 62 need only correspond to a length required for incorporating the ball 64 , the spring 66 , and the plug 68 .
- the discharge check valve 70 includes: a ball 74 , a spring 76 that applies a biasing force to the ball 74 ; and a plug 78 as a ring-shaped member that has a center hole 79 with an inner diameter smaller than the outer diameter of the ball 74 .
- the spring 76 , the ball 74 , and the plug 78 are incorporated in that order from an opening portion 52 b of the hollow portion 52 a of the piston 50 , and fixed by a snap ring 79 .
- the pump chamber 41 is formed by a space that is surrounded by an inner wall 42 b on which the piston body 52 slides, a surface of the piston body 52 on the spring 46 side, and a surface of the valve body 62 of the intake check valve 60 on the spring 46 side.
- the volume inside the pump chamber 41 increases and causes the intake check valve 60 to open and the discharge check valve 70 to close, thereby suctioning the hydraulic oil through the intake port 49 .
- the cylinder 42 is formed with the inner wall 42 b on which the piston body 52 slides, and an inner wall 42 c on which the shaft portion 54 slides.
- the inner wall 42 b and the inner wall 42 c are arranged in a stepped configuration, and the discharge port 43 is formed at a stepped section thereof.
- the stepped section forms a space that is surrounded by a ring-shaped surface of the stepped section between the piston body 52 and the shaft portion 54 , and an outer circumferential surface of the shaft portion 54 . Because the space is formed on the opposite side of the piston body 52 from the pump chamber 41 , the volume of the space decreases when the volume of the pump chamber 41 increases, and the volume of the space increases when the volume of the pump chamber 41 decreases.
- the change in the volume of the space is smaller than the change in the volume of the pump chamber 41 , because the surface area (pressure-receiving surface area) of the piston body 52 that receives pressure from the pump chamber 41 side is larger than the surface area (pressure-receiving surface area) of the piston body 52 that receives pressure from the discharge port 43 side. Therefore, the space functions as a second pump chamber 56 .
- an amount of hydraulic oil that corresponds to the difference in the amount that the volume of the pump chamber 41 decreases and the amount that the volume of the second pump chamber 56 increases is delivered from the pump chamber 41 to the second pump chamber 56 via the discharge check valve 70 and discharged through the discharge port 43 .
- the valve body 62 of the intake check valve 60 is formed from a stepped structure that includes the cylindrical base portion 63 a and the truncated conical projection portion 63 b that projects from the seat surface of the base portion 63 a.
- the valve body 62 of the intake check valve 60 is also formed such that the base portion 63 a has the ring-shaped surface that supports the spring 46 on the circumferential edge portion of the seat surface, and the projection portion 63 b projects inside the pump chamber 41 . Therefore, the spring spacing can be adjusted by adjusting the height of the seat surface of the base portion 63 a, and the volume inside the pump chamber 41 can be adjusted by adjusting the projecting height and diameter of the projection portion 63 b.
- a simple structure can optimize the biasing force of the spring 46 and the volume of the pump chamber 41 , and also further improve discharge performance.
- the hollow portion 62 a formed inside the valve body 62 runs through the axial center inside the base portion 63 a from the back surface of the base portion 63 a, and extends to the vicinity of the proximal end inside the projection portion 63 b, with the ball 64 , the spring 66 , and the plug 68 incorporated inside the hollow portion 62 a. Therefore, the intake check valve 60 can be made more compact because the axial length of the valve body 62 need only correspond to the length required for incorporating the ball 64 , the spring 66 , and the plug 68 .
- the discharge check valve 70 is embedded in the piston 50 .
- the discharge check valve 70 may not be embedded in the piston 50 , and may be incorporated into a valve body outside the cylinder 42 , for example.
- the projection portion 63 b of the valve body 62 has a truncated conical shape.
- the present invention is not limited to this example, and the projection portion 63 b may have any shape, such as a cylindrical shape, provided that the projection portion 63 b projects inside the pump chamber 41 .
- the hollow portion 62 a of the valve body 62 runs through the inside of the base portion 63 a from the back surface of the base portion 63 a, and extends to the vicinity of the proximal end inside the projection portion 63 b.
- the hollow portion 62 a may not extend to inside the projection portion 63 b, In such case, the height of the base portion 63 a may be increased to incorporate the ball 64 , the spring 66 , and the plug 68 in the hollow portion.
- the electromagnetic pump 20 of the embodiment is configured as a type of electromagnetic pump in which one reciprocal movement of the piston 50 discharges the hydraulic oil twice from the discharge port 43 .
- the electromagnetic pump 20 may be any type of electromagnetic pump provided that the electromagnetic pump is capable of discharging the hydraulic oil in association with the reciprocal movement of the piston.
- Such examples include an electromagnetic pump that suctions the hydraulic oil through the intake port into the pump chamber when the piston is forwardly moved by the electromagnetic force from the solenoid portion, and discharges the hydraulic oil inside the pump chamber from the discharge port when the piston is backwardly moved by the biasing force of the spring, as well as an electromagnetic pump that suctions the hydraulic oil through the intake port into the pump chamber when the piston is backwardly moved by the biasing force of the spring, and discharges the hydraulic oil inside the pump chamber from the discharge port when the piston is forwardly moved by the electromagnetic force from the solenoid portion.
- the electromagnetic pump 20 of the embodiment is used to supply a hydraulic pressure for turning on and off a clutch or a brake of an automatic transmission mounted in an automobile.
- the present invention is not limited to this example, and the electromagnetic pump 20 may be used in any system that transports fuel, transports lubricating fluid, or the like.
- the cylinder 42 corresponds to a “cylinder”; the piston 50 to a “piston”; the solenoid portion 30 to an “electromagnetic portion”; the spring 46 to a “biasing member”; the valve body 62 to a “support member”; the ball 64 , the spring 66 , and the plug 68 that constitute the intake check valve 60 to an “intake on-off valve”; the discharge check valve 70 to a “discharge on-off valve”; the base portion 63 a of the valve body 62 to a “support portion”; and the projection portion 63 b to a “projection portion”.
- the present invention may be used in the manufacturing industry of an electromagnetic pump, and the like.
Abstract
An electromagnetic pump including a piston that reciprocates inside a cylinder; an electromagnetic portion and a biasing member that respectively forwardly and backwardly move the piston; a support for the biasing member that defines a chamber with the cylinder and the piston; a valve incorporated into the support member that allows fluid to move from an intake port to the chamber and prohibits reverse flow; and a valve that allows the fluid to move from the chamber to a discharge port and prohibits reverse flow. The support member includes a bottomed hollow portion accommodating at least a portion of the intake on-off valve, and a hole providing communication between a bottom portion of the hollow portion on the chamber side and the chamber. The support member includes a portion that supports the biasing member, and a portion that communicates with the hole and projects from the support toward the piston.
Description
- The disclosure of Japanese Patent Application No. 2011-068808 filed on Mar. 25, 2011 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
- The present invention relates to an electromagnetic pump including: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid.
- A past example of this type of electromagnetic pump (e.g., see Japanese Patent Application Publication No, JP-A-2011-21593) includes: a cylinder; a piston that reciprocates inside the cylinder to change the volume inside a pump chamber; a solenoid portion that forwardly moves the piston; a spring that backwardly moves the piston; an intake check valve that allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge check valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid. According to this electromagnetic pump, the intake check valve and the discharge check valve are accommodated inside the cylinder. The intake check valve is configured from a ball; a hollow cylindrical body that accommodates the ball therein, and is formed with an axially center hole that provides communication between the intake port and the pump chamber and forms an opening portion of the intake port with an inner diameter smaller than the outer diameter of the ball; a spring that biases the ball with respect to the opening portion of the intake port in a direction opposite from the direction in which the hydraulic oil flows from the intake port; and a spring seat that receives the spring. In the intake check valve, the spring seat faces the pump chamber, and a surface of the spring seat on the pump chamber side also supports the spring that backwardly moves the piston.
- In the type of electromagnetic pump described above, the piston and the intake check valve are accommodated facing one another inside the cylinder, and the pump chamber is defined by the cylinder, the piston, and the intake check valve. Therefore, how the intake check valve is configured is an extremely critical factor for determining the volume of the pump chamber and also determining the biasing force of the spring accommodated inside the pump chamber.
- An electromagnetic pump of the present invention further improves discharge performance.
- The electromagnetic pump of the present invention employs the following to achieve the above.
- An electromagnetic pump according to the present invention includes: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid. In the electromagnetic pump, the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber. In addition, the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side.
- According to the present invention, the electromagnetic pump includes: a cylinder; a piston that can reciprocate inside the cylinder; an electromagnetic portion that forwardly moves the piston; a biasing member that backwardly moves the piston; a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber; an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid. In the electromagnetic pump, the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber. In addition, the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side. Thus, the spacing for supporting the biasing member can be set by the support portion, and the volume inside the pump chamber can be controlled by the projection portion, thereby further improving discharge performance.
- In the electromagnetic pump of the present invention described above, a diameter of the projection portion on the piston side may be formed smaller than a diameter of the projection portion on the support portion side. In the electromagnetic pump according to this aspect of the present invention, the projection portion may be formed into a truncated conical shape. Thus, processing of the support member can be made easier.
- In the electromagnetic pump of the present invention, the hydraulic fluid may be discharged by the biasing member backwardly moving the piston. Since the biasing force of the biasing member exhibits less variation due to temperature compared to the electromagnetic force, the axial length of the electromagnetic pump can be shortened by using the biasing force to discharge the hydraulic fluid, and application of the present invention enables further shortening of the axial length.
- In the electromagnetic pump of the present invention, the hollow portion of the support member may be formed such that the bottom portion is more toward the piston side than a support surface of the support portion. Thus, the length of the support member in the axial direction can be shortened and the overall pump can be downsized.
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FIG. 1 is a structural diagram that shows the overall configuration of anelectromagnetic pump 20 as an embodiment of the present invention; -
FIG. 2 is a perspective view of apiston 50 and an intake check valve 60 inserted inside acylinder 42; and -
FIG. 3 is an exterior view that shows the exterior of avalve body 62. - Next, an embodiment of the present invention will be described.
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FIG. 1 is a structural diagram that shows the overall configuration of anelectromagnetic pump 20 as an embodiment of the present invention. As shown in the figure, theelectromagnetic pump 20 of the embodiment is configured as a piston pump that reciprocates apiston 50 to pressure-feed a hydraulic oil. Theelectromagnetic pump 20 also includes asolenoid portion 30 that generates an electromagnetic force, and apump portion 40 that operates by the electromagnetic force of thesolenoid portion 30. Theelectromagnetic pump 20 is incorporated into a valve body as a portion of a hydraulic circuit for turning on and off a clutch or a brake provided in an automatic transmission mounted in an automobile, for example. - The
solenoid portion 30 has acase 31 as a bottomed cylinder member on which anelectromagnetic coil 32, aplunger 34 as a movable element, and acore 36 as a fixed element are disposed. Applying a current to theelectromagnetic coil 32 forms a magnetic circuit in which magnetic flux circles thecase 31, theplunger 34, and thecore 36, whereby theplunger 34 is suctioned and presses out ashaft 38 that is in contact with a proximal end of theplunger 34. - The
pump portion 40 includes: a hollowcylindrical cylinder 42 that is joined to thesolenoid portion 30; thepiston 50 that is slidably disposed inside thecylinder 42, and has a base end surface that is coaxial with and contacts a proximal end of theshaft 38 of thesolenoid portion 30; aspring 46 that contacts a proximal end of thepiston 50, and applies a biasing force in a direction opposite from the direction in which thesolenoid portion 30 applies an electromagnetic force; an intake check valve 60 that supports thespring 46 from a side opposite from the proximal end surface of thepiston 50, and allows the hydraulic oil to flow in the suctioning direction toward apump chamber 41 and prohibits the hydraulic oil from flowing in the reverse direction; a discharge check valve 70 that is embedded in thepiston 50, and allows the hydraulic oil to flow in the discharging direction from thepump chamber 41 and prohibits the hydraulic oil from flowing in the reverse direction; astrainer 47 that is disposed upstream of the intake check valve 60, and catches foreign matter included in the hydraulic oil that is suctioned toward thepump chamber 41; and acylinder cover 48 that covers anopening portion 42 a on a side of thecylinder 42 opposite from thesolenoid portion 30 with thepiston 50, the discharge check valve 70, thespring 46, the intake check valve 60, and thestrainer 47 incorporated in that order from theopening portion 42 a. Spiral grooves are formed in the circumferential direction on an inner circumferential surface of thecylinder cover 48 and an outer circumferential surface of theopening portion 42 a of thecylinder 42. Threadedly fastening thecylinder cover 48 with theopening portion 42 a of thecylinder 42 attaches thecylinder cover 48 to theopening portion 42 a of thecylinder 42. Note that, in thepump portion 40, anintake port 49 for suctioning the hydraulic oil is formed at an axial center of thecylinder cover 48, and adischarge port 43 for discharging the suctioned hydraulic oil is formed in a side surface of thecylinder 42. - The
piston 50 is formed from acylindrical piston body 52, and acylindrical shaft portion 54 b that has an outer diameter smaller than thepiston body 52 and an end surface that contacts the proximal end of theshaft 38 of thesolenoid portion 30. Thepiston 50 moves in association with theshaft 38 of thesolenoid portion 30 and reciprocates inside thecylinder 42. A cylindrical, bottomed hollow portion 52 a that can accommodate the discharge check valve 70 is formed at an axial center of thepiston 50. The hollow portion 52 a of thepiston 50 runs from a proximal end surface of thepiston 50 to inside thepiston body 52, and extends to partway inside theshaft portion 54. In addition, two throughholes shaft portion 54. Thedischarge port 43 is formed around theshaft portion 54, and the hollow portion 52 a of thepiston 50 is provided in communication with thedischarge port 43 through the two throughholes - The intake check valve 60 includes: a
valve body 62 that is fitted by insertion to an inner circumferential surface of theopening portion 42 a of thecylinder 42, formed therein with a bottomedhollow portion 62 a, and formed with acenter hole 62 b that provides communication between thehollow portion 62 a and thepump chamber 41 at an axial center of the bottom of thehollow portion 62 a; aball 64; aspring 66 that applies a biasing force to theball 64; and aplug 68 that is fitted by insertion to an inner circumferential surface of thehollow portion 62 a with theball 64 and thespring 66 incorporated into thehollow portion 62 a of thevalve body 62. -
FIG. 2 is a perspective view of thepiston 50 and the intake check valve 60 inserted inside thecylinder 42, andFIG. 3 is an exterior view that shows the exterior of thevalve body 62. As shown in the figures, thevalve body 62 is formed from a stepped structure that includes acylindrical base portion 63 a and a truncatedconical projection portion 63 b that projects from a seat surface of thebase portion 63 a. On a circumferential edge portion of the seat surface, thebase portion 63 a has a ring-shaped surface that supports thespring 46. The height of the seat surface is adjusted to allow spring spacing for realizing a required biasing force. Theprojection portion 63 b is formed so as to project inside thepump chamber 41, and the projecting height and diameter are adjusted such that the volume inside thepump chamber 41 becomes a volume for realizing a required discharge pressure. In other words, thevalve body 62 adjusts the biasing force of thespring 46 and the volume of thepump chamber 41 using thebase portion 63 a and theprojection portion 63 b. - The
hollow portion 62 a formed inside thevalve body 62 runs through an axial center inside thebase portion 63 a from a back surface of thebase portion 63 a, and extends to the vicinity of a proximal end inside theprojection portion 63 b, with theball 64, thespring 66, and theplug 68 incorporated in that order inside thehollow portion 62 a. The intake check valve 60 can thus be made compact because the axial length of thevalve body 62 need only correspond to a length required for incorporating theball 64, thespring 66, and theplug 68. - When a differential pressure (P1-P2) between a pressure P1 on the
intake port 49 side and a pressure P2 on thepump chamber 41 side is equal to or greater than a predetermined pressure that overcomes the biasing force of thespring 66, thespring 66 contracts and causes theball 64 to separate from thecenter hole 69 of theplug 68, thereby opening the intake check valve 60. When the differential pressure (P1-P2) described above is less than the predetermined pressure, thespring 66 elongates and causes theball 64 to press against thecenter hole 69 of theplug 68, thereby blocking thecenter hole 69 and closing the intake check valve 60. - The discharge check valve 70 includes: a
ball 74, aspring 76 that applies a biasing force to theball 74; and aplug 78 as a ring-shaped member that has a center hole 79 with an inner diameter smaller than the outer diameter of theball 74. Thespring 76, theball 74, and theplug 78 are incorporated in that order from anopening portion 52 b of the hollow portion 52 a of thepiston 50, and fixed by a snap ring 79. - When a differential pressure (P2-P3) between the pressure P2 on the
pump chamber 41 side and a pressure P3 on thedischarge port 43 side is equal to or greater than a predetermined pressure that overcomes the biasing force of thespring 76, thespring 76 contracts and causes theball 74 to separate from the center hole 79 of theplug 78, thereby opening the discharge check valve 70. When the differential pressure (P2-P3) described above is less than the predetermined pressure, thespring 76 elongates and causes theball 74 to press against the center hole 79 of theplug 78, thereby blocking the center hole 79 and closing the discharge check valve 70. - In the
cylinder 42, thepump chamber 41 is formed by a space that is surrounded by an inner wall 42 b on which thepiston body 52 slides, a surface of thepiston body 52 on thespring 46 side, and a surface of thevalve body 62 of the intake check valve 60 on thespring 46 side. In thepump chamber 41, when thepiston 50 moves by the biasing force of thespring 46, the volume inside thepump chamber 41 increases and causes the intake check valve 60 to open and the discharge check valve 70 to close, thereby suctioning the hydraulic oil through theintake port 49. When thepiston 50 moves by the electromagnetic force of thesolenoid portion 30, the volume inside thepump chamber 41 decreases and causes the intake check valve 60 to close and the discharge check valve 70 to open, thereby discharging the suctioned hydraulic oil through thedischarge port 43. - Also, the
cylinder 42 is formed with the inner wall 42 b on which thepiston body 52 slides, and aninner wall 42 c on which theshaft portion 54 slides. The inner wall 42 b and theinner wall 42 c are arranged in a stepped configuration, and thedischarge port 43 is formed at a stepped section thereof. The stepped section forms a space that is surrounded by a ring-shaped surface of the stepped section between thepiston body 52 and theshaft portion 54, and an outer circumferential surface of theshaft portion 54. Because the space is formed on the opposite side of thepiston body 52 from thepump chamber 41, the volume of the space decreases when the volume of thepump chamber 41 increases, and the volume of the space increases when the volume of thepump chamber 41 decreases. At such times, the change in the volume of the space is smaller than the change in the volume of thepump chamber 41, because the surface area (pressure-receiving surface area) of thepiston body 52 that receives pressure from thepump chamber 41 side is larger than the surface area (pressure-receiving surface area) of thepiston body 52 that receives pressure from thedischarge port 43 side. Therefore, the space functions as asecond pump chamber 56. In other words, when thepiston 50 moves by the electromagnetic force of thesolenoid portion 30, an amount of hydraulic oil that corresponds to the difference in the amount that the volume of thepump chamber 41 decreases and the amount that the volume of thesecond pump chamber 56 increases is delivered from thepump chamber 41 to thesecond pump chamber 56 via the discharge check valve 70 and discharged through thedischarge port 43. When thepiston 50 moves by the biasing force of thespring 46, an amount of hydraulic oil that corresponds to the amount that the volume of thepump chamber 41 increases is suctioned through theintake port 49 into thepump chamber 41 via the intake check valve 60, while an amount of hydraulic oil that corresponds to the amount that the volume of thesecond pump chamber 56 decreases is discharged from thesecond pump chamber 56 through thedischarge port 43. Accordingly, one reciprocal movement of thepiston 50 discharges the hydraulic oil twice from thedischarge port 43, which can reduce discharge variation and improve discharge performance. - According to the
electromagnetic pump 20 of the embodiment described above, thevalve body 62 of the intake check valve 60 is formed from a stepped structure that includes thecylindrical base portion 63 a and the truncatedconical projection portion 63 b that projects from the seat surface of thebase portion 63 a. In addition, thevalve body 62 of the intake check valve 60 is also formed such that thebase portion 63 a has the ring-shaped surface that supports thespring 46 on the circumferential edge portion of the seat surface, and theprojection portion 63 b projects inside thepump chamber 41. Therefore, the spring spacing can be adjusted by adjusting the height of the seat surface of thebase portion 63 a, and the volume inside thepump chamber 41 can be adjusted by adjusting the projecting height and diameter of theprojection portion 63 b. As a consequence, a simple structure can optimize the biasing force of thespring 46 and the volume of thepump chamber 41, and also further improve discharge performance. - Moreover, the
hollow portion 62 a formed inside thevalve body 62 runs through the axial center inside thebase portion 63 a from the back surface of thebase portion 63 a, and extends to the vicinity of the proximal end inside theprojection portion 63 b, with theball 64, thespring 66, and theplug 68 incorporated inside thehollow portion 62 a. Therefore, the intake check valve 60 can be made more compact because the axial length of thevalve body 62 need only correspond to the length required for incorporating theball 64, thespring 66, and theplug 68. - In the
electromagnetic pump 20 of the embodiment, the discharge check valve 70 is embedded in thepiston 50. However, the discharge check valve 70 may not be embedded in thepiston 50, and may be incorporated into a valve body outside thecylinder 42, for example. - In the
electromagnetic pump 20 of the embodiment, theprojection portion 63 b of thevalve body 62 has a truncated conical shape. However, the present invention is not limited to this example, and theprojection portion 63 b may have any shape, such as a cylindrical shape, provided that theprojection portion 63 b projects inside thepump chamber 41. - In the
electromagnetic pump 20 of the embodiment, thehollow portion 62 a of thevalve body 62 runs through the inside of thebase portion 63 a from the back surface of thebase portion 63 a, and extends to the vicinity of the proximal end inside theprojection portion 63 b. However, thehollow portion 62 a may not extend to inside theprojection portion 63 b, In such case, the height of thebase portion 63 a may be increased to incorporate theball 64, thespring 66, and theplug 68 in the hollow portion. - The
electromagnetic pump 20 of the embodiment is configured as a type of electromagnetic pump in which one reciprocal movement of thepiston 50 discharges the hydraulic oil twice from thedischarge port 43. However, the present invention is not limited to this example. Theelectromagnetic pump 20 may be any type of electromagnetic pump provided that the electromagnetic pump is capable of discharging the hydraulic oil in association with the reciprocal movement of the piston. Such examples include an electromagnetic pump that suctions the hydraulic oil through the intake port into the pump chamber when the piston is forwardly moved by the electromagnetic force from the solenoid portion, and discharges the hydraulic oil inside the pump chamber from the discharge port when the piston is backwardly moved by the biasing force of the spring, as well as an electromagnetic pump that suctions the hydraulic oil through the intake port into the pump chamber when the piston is backwardly moved by the biasing force of the spring, and discharges the hydraulic oil inside the pump chamber from the discharge port when the piston is forwardly moved by the electromagnetic force from the solenoid portion. - The
electromagnetic pump 20 of the embodiment is used to supply a hydraulic pressure for turning on and off a clutch or a brake of an automatic transmission mounted in an automobile. However, the present invention is not limited to this example, and theelectromagnetic pump 20 may be used in any system that transports fuel, transports lubricating fluid, or the like. - Here, the correspondence relation will be described between main elements in the embodiment and main elements of the invention as listed in the Summary of the Invention. In the embodiment, the
cylinder 42 corresponds to a “cylinder”; thepiston 50 to a “piston”; thesolenoid portion 30 to an “electromagnetic portion”; thespring 46 to a “biasing member”; thevalve body 62 to a “support member”; theball 64, thespring 66, and theplug 68 that constitute the intake check valve 60 to an “intake on-off valve”; the discharge check valve 70 to a “discharge on-off valve”; thebase portion 63 a of thevalve body 62 to a “support portion”; and theprojection portion 63 b to a “projection portion”. Note that with regard to the correspondence relation between the main elements of the embodiment and the main elements of the invention as listed in the Summary of the Invention, the embodiment is only an example for giving a specific description of a best mode for carrying out the invention explained in the Summary of the Invention. This correspondence relation does not limit the elements of the invention as described in the Summary of the Invention. In other words, any interpretation of the invention described in the Summary of the Invention shall be based on the description therein; the embodiment is merely one specific example of the invention described in the Summary of the Invention. - The above embodiment was used to describe a mode for carrying out the present invention. However, the present invention is not particularly limited to such an example, and may obviously be carried out in various embodiments without departing from the scope of the present invention.
- The present invention may be used in the manufacturing industry of an electromagnetic pump, and the like.
Claims (5)
1. An electromagnetic pump comprising:
a cylinder;
a piston that can reciprocate inside the cylinder;
an electromagnetic portion that forwardly moves the piston;
a biasing member that backwardly moves the piston;
a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber;
an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and
a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid, wherein
the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber, and
the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side.
2. The electromagnetic pump according to claim 1 , wherein a diameter of the projection portion on the piston side is formed smaller than a diameter of the projection portion on the support portion side.
3. The electromagnetic pump according to claim 2 , wherein the projection portion is formed into a truncated conical shape.
4. The electromagnetic pump according to claim 1 , wherein the hydraulic fluid is discharged by the biasing member backwardly moving the piston.
5. The electromagnetic pump according to claim 1 , wherein the hollow portion of the support member is formed such that the bottom portion is more toward the piston side than a support surface of the support portion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011068808A JP5505347B2 (en) | 2011-03-25 | 2011-03-25 | Electromagnetic pump |
JP2011-068808 | 2011-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120244014A1 true US20120244014A1 (en) | 2012-09-27 |
Family
ID=46877500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/413,234 Abandoned US20120244014A1 (en) | 2011-03-25 | 2012-03-06 | Electromagnetic pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120244014A1 (en) |
JP (1) | JP5505347B2 (en) |
CN (1) | CN103119296A (en) |
DE (1) | DE112012000094T5 (en) |
WO (1) | WO2012132710A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015173099A1 (en) * | 2014-05-16 | 2015-11-19 | Robert Bosch Gmbh | Device for injecting a medium, and an exhaust gas after-treatment installation |
US9957957B2 (en) | 2012-10-31 | 2018-05-01 | Aisin Aw Co., Ltd. | Electromagnetic pump |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2660744C1 (en) * | 2016-07-08 | 2018-07-09 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный аграрный университет" (ФГБОУ ВО Казанский ГАУ) | Piston pump |
JP7129861B2 (en) * | 2018-09-27 | 2022-09-02 | 豊興工業株式会社 | electromagnetic pump |
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US4743179A (en) * | 1985-02-13 | 1988-05-10 | Webasto-Werk W. Baier Gmbh & Co. | Electromagnetically activated piston pump |
US5073095A (en) * | 1990-04-10 | 1991-12-17 | Purolator Product Company | Whisper quiet electromagnetic fluid pump |
US5797733A (en) * | 1994-03-11 | 1998-08-25 | Wilson Greatbatch Ltd. | Low power electromagnetic pump |
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US20050089418A1 (en) * | 2003-10-28 | 2005-04-28 | Bonfardeci Anthony J. | Electromagnetic fuel pump |
US20070128054A1 (en) * | 2003-09-05 | 2007-06-07 | Inergy Auto. Systems Research (Societe Anonyme) | Dosing pump for a liquid fuel additive |
US20090120967A1 (en) * | 2007-10-16 | 2009-05-14 | Ivek Corporation | Coupling system for use with fluid displacement apparatus |
US20100215530A1 (en) * | 2006-10-17 | 2010-08-26 | Oliver Schmautz | Piston pump for a vehicle brake system, having a piston rod |
WO2010146952A1 (en) * | 2009-06-18 | 2010-12-23 | Aisin Aw Co., Ltd. | Electromagnetic pump |
US8388323B2 (en) * | 2006-07-12 | 2013-03-05 | Delphi Technologies Holding S.Arl | Reagent dosing pump |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5213607Y2 (en) * | 1974-04-10 | 1977-03-28 | ||
JPH0441260Y2 (en) * | 1984-10-15 | 1992-09-28 |
-
2011
- 2011-03-25 JP JP2011068808A patent/JP5505347B2/en not_active Expired - Fee Related
-
2012
- 2012-02-28 CN CN2012800028896A patent/CN103119296A/en active Pending
- 2012-02-28 WO PCT/JP2012/054914 patent/WO2012132710A1/en active Application Filing
- 2012-02-28 DE DE112012000094T patent/DE112012000094T5/en not_active Withdrawn
- 2012-03-06 US US13/413,234 patent/US20120244014A1/en not_active Abandoned
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US4743179A (en) * | 1985-02-13 | 1988-05-10 | Webasto-Werk W. Baier Gmbh & Co. | Electromagnetically activated piston pump |
US5073095A (en) * | 1990-04-10 | 1991-12-17 | Purolator Product Company | Whisper quiet electromagnetic fluid pump |
US5797733A (en) * | 1994-03-11 | 1998-08-25 | Wilson Greatbatch Ltd. | Low power electromagnetic pump |
US7094041B2 (en) * | 2000-10-18 | 2006-08-22 | Mikuni Corporation | Electromagnetic drive type plunger pump |
US20040022651A1 (en) * | 2000-10-18 | 2004-02-05 | Shogo Hashimoto | Electromagnetic drive type plunger pump |
US20040241017A1 (en) * | 2003-05-30 | 2004-12-02 | Buzzi S.R.L | Reciprocating electromagnetic micro-pump, particularly for small electrical appliances |
US20070128054A1 (en) * | 2003-09-05 | 2007-06-07 | Inergy Auto. Systems Research (Societe Anonyme) | Dosing pump for a liquid fuel additive |
US8109739B2 (en) * | 2003-09-05 | 2012-02-07 | Inergy Automotive Systems Research (Société Anonyme) | Dosing pump for a liquid fuel additive |
US20050089418A1 (en) * | 2003-10-28 | 2005-04-28 | Bonfardeci Anthony J. | Electromagnetic fuel pump |
US8388323B2 (en) * | 2006-07-12 | 2013-03-05 | Delphi Technologies Holding S.Arl | Reagent dosing pump |
US20100215530A1 (en) * | 2006-10-17 | 2010-08-26 | Oliver Schmautz | Piston pump for a vehicle brake system, having a piston rod |
US20090120967A1 (en) * | 2007-10-16 | 2009-05-14 | Ivek Corporation | Coupling system for use with fluid displacement apparatus |
WO2010146952A1 (en) * | 2009-06-18 | 2010-12-23 | Aisin Aw Co., Ltd. | Electromagnetic pump |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9957957B2 (en) | 2012-10-31 | 2018-05-01 | Aisin Aw Co., Ltd. | Electromagnetic pump |
WO2015173099A1 (en) * | 2014-05-16 | 2015-11-19 | Robert Bosch Gmbh | Device for injecting a medium, and an exhaust gas after-treatment installation |
Also Published As
Publication number | Publication date |
---|---|
JP2012202340A (en) | 2012-10-22 |
JP5505347B2 (en) | 2014-05-28 |
DE112012000094T5 (en) | 2013-08-01 |
CN103119296A (en) | 2013-05-22 |
WO2012132710A1 (en) | 2012-10-04 |
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Legal Events
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AS | Assignment |
Owner name: AISIN AW CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAI, MASAYA;KATO, KAZUHIKO;REEL/FRAME:027844/0808 Effective date: 20120301 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |