US20120244025A1 - Electromagnetic pump - Google Patents
Electromagnetic pump Download PDFInfo
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- US20120244025A1 US20120244025A1 US13/416,532 US201213416532A US2012244025A1 US 20120244025 A1 US20120244025 A1 US 20120244025A1 US 201213416532 A US201213416532 A US 201213416532A US 2012244025 A1 US2012244025 A1 US 2012244025A1
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- Prior art keywords
- electromagnetic
- pump
- piston
- cylinder
- discharge port
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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 pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston, wherein inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit.
- an electromagnetic pump of this type related art has proposed an electromagnetic pump that is incorporated into a hydraulic circuit (valve body) of an automatic transmission mounted in an automobile that has an idling stop function (e.g., see Japanese Patent Application Publication No. JP-A-2010-181010).
- the electromagnetic pump is used to maintain a clutch of the automatic transmission to a stroke end pressure while an engine is stopped.
- the electromagnetic pump described above is designed with a relatively high discharge performance because of the need to apply a hydraulic pressure to an oil chamber of the clutch. Hydraulic fluid is thus prone to leak from the discharge port, and the discharge performance of the electromagnetic pump may suffer as a consequence.
- An electromagnetic pump of the present invention secures discharge performance by suppressing hydraulic fluid leakage.
- the electromagnetic pump of the present invention employs the following to achieve the above.
- An electromagnetic pump includes: a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston.
- a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston.
- inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit.
- the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port.
- the electromagnetic pump includes: a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston.
- a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston.
- inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit.
- the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port. Since there is
- the intake port may be formed on an end surface of the cylinder on a side opposite from the electromagnetic portion side
- the discharge port may be formed in a side surface of the cylinder
- the pin groove may be formed on the side surface of the cylinder.
- 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 an exterior view that shows the exterior of the electromagnetic pump 20 of the embodiment
- FIG. 3 is a cross-sectional view that shows a cross section A-A of the electromagnetic pump 20 in FIG. 2 ;
- FIG. 4 is an explanatory diagram that shows how the electromagnetic pump 20 of the embodiment is attached to a valve body 80 .
- 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 80 formed with a plurality of oil passages 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 .
- the plug 68 is formed as a ring-shaped member that includes a center hole 69 with an inner diameter smaller than the outer diameter of the ball 64 .
- the ball 64 biased by the spring 66 is pressed against the center hole 69 .
- 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 .
- FIG. 2 shows the exterior of the electromagnetic pump 20 of the embodiment.
- FIG. 3 shows a cross section A-A of the electromagnetic pump 20 in FIG. 2 .
- FIG. 4 shows how the electromagnetic pump 20 of the embodiment is incorporated into the valve body 80 .
- the side surface of the cylinder 42 of the electromagnetic pump 20 is formed with an arc-shaped pin groove 44 at a position farther from the solenoid portion 30 than a position at which the discharge port 43 is formed.
- the pump portion 40 is inserted into the valve body 80 with the solenoid portion 30 exposed, and a pin 84 is passed through a pin hole 82 formed in the valve body 80 such that the pin 84 engages with the pin groove 44 inside the valve body 80 to fix the pump portion 40 to the valve body 80 .
- the pin groove 44 is formed at a position on the cylinder 42 closer to the solenoid portion 30 than a position at which the discharge port 43 is formed. Since the discharge port 43 is under a high pressure due to the operation of the electromagnetic pump 20 , the hydraulic oil tends to leak from the discharge port 43 to a gap between the cylinder 42 and the valve body 80 .
- the hydraulic oil leakage may therefore reach the solenoid portion 30 side via the pin groove 44 , and in such case, may result in a loss of hydraulic pressure.
- the pin groove 44 is formed at a position farther from the solenoid portion 30 than a position at which the discharge port 43 is formed so that such a failure does not occur.
- the pump portion 40 is inserted into the valve body 80 with the solenoid portion 30 exposed, and the pin 84 is passed through the pin hole 82 formed in the valve body 80 such that the pin 84 engages with the pin groove 44 inside the valve body 80 to fix the electromagnetic pump 20 .
- the pin groove 44 is formed at a position farther from the solenoid portion 30 than a position at which the discharge port 43 is formed. Therefore, even if the hydraulic oil leaks from the discharge port 43 to the gap between the cylinder 42 and the valve body 80 , the hydraulic oil is much less likely to reach the solenoid portion 30 side, and a loss of hydraulic pressure can thus be prevented.
- the intake check valve 60 and the discharge check valve 70 are embedded inside the cylinder 42 .
- one or both of the intake check valve 60 and the discharge check valve 70 may be disposed outside the cylinder 42 .
- 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 hydraulic circuit that includes the valve body 80 corresponds to a “fluid pressure circuit”; the cylinder 42 to a “cylinder”; the piston 50 to a “piston”; the solenoid portion 30 to an “electromagnetic portion”; and the pin groove 44 to a “pin groove”.
- 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.
- 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 present invention may be used in the manufacturing industry of an electromagnetic pump, and the like.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetic Pumps, Or The Like (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
An electromagnetic pump including a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston. Inserting the pump portion inside a fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside a fluid pressure circuit, and the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port.
Description
- The disclosure of Japanese Patent Application No. 2011-068805 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 pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston, wherein inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit.
- As an electromagnetic pump of this type, related art has proposed an electromagnetic pump that is incorporated into a hydraulic circuit (valve body) of an automatic transmission mounted in an automobile that has an idling stop function (e.g., see Japanese Patent Application Publication No. JP-A-2010-181010). The electromagnetic pump is used to maintain a clutch of the automatic transmission to a stroke end pressure while an engine is stopped.
- The electromagnetic pump described above is designed with a relatively high discharge performance because of the need to apply a hydraulic pressure to an oil chamber of the clutch. Hydraulic fluid is thus prone to leak from the discharge port, and the discharge performance of the electromagnetic pump may suffer as a consequence.
- An electromagnetic pump of the present invention secures discharge performance by suppressing hydraulic fluid leakage.
- The electromagnetic pump of the present invention employs the following to achieve the above.
- An electromagnetic pump according to the present invention includes: a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston. In the electromagnetic pump, inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit. In addition, the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port.
- According to the present invention, the electromagnetic pump includes: a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and an electromagnetic portion that reciprocates the piston. In the electromagnetic pump, inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit. In addition, the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port. Since there is no leakage path from the discharge port through the pin groove to outside, hydraulic fluid leakage can thus be suppressed. As a consequence, the discharge performance of the electromagnetic pump can be secured.
- In the electromagnetic pump described above, the intake port may be formed on an end surface of the cylinder on a side opposite from the electromagnetic portion side, the discharge port may be formed in a side surface of the cylinder, and the pin groove may be formed on the side surface of the cylinder.
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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 an exterior view that shows the exterior of theelectromagnetic pump 20 of the embodiment; -
FIG. 3 is a cross-sectional view that shows a cross section A-A of theelectromagnetic pump 20 inFIG. 2 ; and -
FIG. 4 is an explanatory diagram that shows how theelectromagnetic pump 20 of the embodiment is attached to avalve body 80. - 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 avalve body 80 formed with a plurality of oil passages 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; anintake 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; adischarge 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 theintake 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, thedischarge check valve 70, thespring 46, theintake 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, bottomedhollow portion 52 a that can accommodate thedischarge check valve 70 is formed at an axial center of thepiston 50. Thehollow 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 thehollow portion 52 a of thepiston 50 is provided in communication with thedischarge port 43 through the two throughholes - The
intake check valve 60 includes: avalve body 62 that is fitted by insertion to an inner circumferential surface of theopening portion 42 a of thecylinder 42, formed therein with a bottomed hollow portion 62 a, and formed with acenter hole 62 b that provides communication between the hollow portion 62 a and thepump chamber 41 at an axial center of the bottom of the hollow portion 62 a; a ball 64; aspring 66 that applies a biasing force to the ball 64; and aplug 68 that is fitted by insertion to an inner circumferential surface of the hollow portion 62 a with the ball 64 and thespring 66 incorporated into the hollow portion 62 a of thevalve body 62. Theplug 68 is formed as a ring-shaped member that includes acenter hole 69 with an inner diameter smaller than the outer diameter of the ball 64. The ball 64 biased by thespring 66 is pressed against thecenter hole 69. - 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 the ball 64 to separate from thecenter hole 69 of theplug 68, thereby opening theintake check valve 60. When the differential pressure (P1-P2) described above is less than the predetermined pressure, thespring 66 elongates and causes the ball 64 to press against thecenter hole 69 of theplug 68, thereby blocking thecenter hole 69 and closing theintake check valve 60. - The
discharge check valve 70 includes: aball 74, a spring 76 that applies a biasing force to theball 74; and a plug 78 as a ring-shaped member that has acenter hole 79 with an inner diameter smaller than the outer diameter of theball 74. The spring 76, theball 74, and the plug 78 are incorporated in that order from anopening portion 52 b of thehollow portion 52 a of thepiston 50, and fixed by asnap 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 the spring 76, the spring 76 contracts and causes theball 74 to separate from thecenter hole 79 of the plug 78, thereby opening thedischarge check valve 70. When the differential pressure (P2-P3) described above is less than the predetermined pressure, the spring 76 elongates and causes theball 74 to press against thecenter hole 79 of the plug 78, thereby blocking thecenter hole 79 and closing thedischarge check valve 70. - In the
cylinder 42, thepump chamber 41 is formed by a space that is surrounded by aninner 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 theintake 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 theintake check valve 60 to open and thedischarge 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 theintake check valve 60 to close and thedischarge check valve 70 to open, thereby discharging the suctioned hydraulic oil through thedischarge port 43. - Also, the
cylinder 42 is formed with theinner wall 42 b on which thepiston body 52 slides, and aninner wall 42 c on which theshaft portion 54 slides. Theinner 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 a second 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 the second pump chamber 56 increases is delivered from thepump chamber 41 to the second pump chamber 56 via thedischarge 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 theintake check valve 60, while an amount of hydraulic oil that corresponds to the amount that the volume of the second pump chamber 56 decreases is discharged from the second 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. -
FIG. 2 shows the exterior of theelectromagnetic pump 20 of the embodiment.FIG. 3 shows a cross section A-A of theelectromagnetic pump 20 in FIG. 2.FIG. 4 shows how theelectromagnetic pump 20 of the embodiment is incorporated into thevalve body 80. As shown in the figures, the side surface of thecylinder 42 of theelectromagnetic pump 20 is formed with an arc-shapedpin groove 44 at a position farther from thesolenoid portion 30 than a position at which thedischarge port 43 is formed. In theelectromagnetic pump 20 of the embodiment, thepump portion 40 is inserted into thevalve body 80 with thesolenoid portion 30 exposed, and apin 84 is passed through apin hole 82 formed in thevalve body 80 such that thepin 84 engages with thepin groove 44 inside thevalve body 80 to fix thepump portion 40 to thevalve body 80. The following assumes that thepin groove 44 is formed at a position on thecylinder 42 closer to thesolenoid portion 30 than a position at which thedischarge port 43 is formed. Since thedischarge port 43 is under a high pressure due to the operation of theelectromagnetic pump 20, the hydraulic oil tends to leak from thedischarge port 43 to a gap between thecylinder 42 and thevalve body 80. The hydraulic oil leakage may therefore reach thesolenoid portion 30 side via thepin groove 44, and in such case, may result in a loss of hydraulic pressure. However, in the embodiment, thepin groove 44 is formed at a position farther from thesolenoid portion 30 than a position at which thedischarge port 43 is formed so that such a failure does not occur. - According to the
electromagnetic pump 20 of the embodiment described above, thepump portion 40 is inserted into thevalve body 80 with thesolenoid portion 30 exposed, and thepin 84 is passed through thepin hole 82 formed in thevalve body 80 such that thepin 84 engages with thepin groove 44 inside thevalve body 80 to fix theelectromagnetic pump 20. Thepin groove 44 is formed at a position farther from thesolenoid portion 30 than a position at which thedischarge port 43 is formed. Therefore, even if the hydraulic oil leaks from thedischarge port 43 to the gap between thecylinder 42 and thevalve body 80, the hydraulic oil is much less likely to reach thesolenoid portion 30 side, and a loss of hydraulic pressure can thus be prevented. - In the
electromagnetic pump 20 of the embodiment, theintake check valve 60 and thedischarge check valve 70 are embedded inside thecylinder 42. However, one or both of theintake check valve 60 and thedischarge check valve 70 may be disposed outside thecylinder 42. - 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 hydraulic circuit that includes the
valve body 80 corresponds to a “fluid pressure circuit”; thecylinder 42 to a “cylinder”; thepiston 50 to a “piston”; thesolenoid portion 30 to an “electromagnetic portion”; and thepin groove 44 to a “pin groove”. 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 (2)
1. An electromagnetic pump comprising:
a pump portion that includes a cylinder that is formed with an intake port and a discharge port that are in communication with a flow passage of a fluid pressure circuit, a pin groove, and a piston that through a reciprocal movement inside the cylinder suctions a fluid from the intake port and discharges the fluid from the discharge port; and
an electromagnetic portion that reciprocates the piston, wherein
inserting the pump portion inside the fluid pressure circuit with the electromagnetic portion externally exposed from the fluid pressure circuit, and inserting a pin from outside into the pin groove incorporates the electromagnetic pump inside the fluid pressure circuit, and
the pin groove is formed at a position farther from an electromagnetic portion side than the discharge port.
2. The electromagnetic pump according to claim 1 , wherein
the intake port is formed on an end surface of the cylinder on a side opposite from the electromagnetic portion side,
the discharge port is formed in a side surface of the cylinder, and
the pin groove is formed on the side surface of the cylinder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-068805 | 2011-03-25 | ||
JP2011068805A JP2012202337A (en) | 2011-03-25 | 2011-03-25 | Electromagnetic pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120244025A1 true US20120244025A1 (en) | 2012-09-27 |
Family
ID=46877506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/416,532 Abandoned US20120244025A1 (en) | 2011-03-25 | 2012-03-09 | Electromagnetic pump |
Country Status (3)
Country | Link |
---|---|
US (1) | US20120244025A1 (en) |
JP (1) | JP2012202337A (en) |
WO (1) | WO2012132668A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11988218B2 (en) | 2021-03-10 | 2024-05-21 | Multi Parts Supply Usa, Inc. | Electric coolant pump with expansion compensating seal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2832291A (en) * | 1954-06-17 | 1958-04-29 | Gorsko Stanley | Electromagnetic pump |
JP2003227462A (en) * | 2002-02-04 | 2003-08-15 | Silver Kk | Electromagnetic pump and fuel system using same |
JP4526082B2 (en) * | 2005-08-17 | 2010-08-18 | 株式会社不二越 | Electromagnetic pump |
JPWO2009145176A1 (en) * | 2008-05-29 | 2011-10-13 | アイシン・エィ・ダブリュ株式会社 | Solenoid valve device |
-
2011
- 2011-03-25 JP JP2011068805A patent/JP2012202337A/en not_active Withdrawn
-
2012
- 2012-02-23 WO PCT/JP2012/054387 patent/WO2012132668A1/en active Application Filing
- 2012-03-09 US US13/416,532 patent/US20120244025A1/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11988218B2 (en) | 2021-03-10 | 2024-05-21 | Multi Parts Supply Usa, Inc. | Electric coolant pump with expansion compensating seal |
Also Published As
Publication number | Publication date |
---|---|
JP2012202337A (en) | 2012-10-22 |
WO2012132668A1 (en) | 2012-10-04 |
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