JP2008025398A - Plunger pump - Google Patents

Abstract

In a plunger pump that discharges engine lubricating oil, locking due to foreign object biting or the like is prevented to ensure stable discharge characteristics.
A drive means includes a plurality of plungers, a drive means, and a pump body that slidably accommodates the plurality of plungers in the same direction and that defines a passage for suction and discharge of fluid or inflow and outflow of fluid. The solenoid rod 61 exerts a driving force in the reciprocating direction of the plurality of plungers, and is interposed between the solenoid rod and the plurality of plungers to transmit the driving force in at least the forward movement direction of the solenoid rod and has a plurality of degrees of freedom with a predetermined degree of freedom. And a spring 40 that exerts an urging force in the backward movement direction for retreating the plurality of plungers. Thereby, the plunger 20 is prevented from being locked and a stable discharge characteristic is obtained.
[Selection] Figure 4

Description

  The present invention relates to a plunger pump that compresses and discharges fluid by reciprocating a plunger, and more particularly, an electromagnetically driven plunger that is applied to supply lubricating oil to a sliding surface of a rotary engine, a two-cycle reciprocating engine, or the like. Regarding pumps.

  In a rotary engine or a two-cycle reciprocating engine or the like, toward a trochoidal inner peripheral surface (sliding surface) on which the rotor slides or toward an inner peripheral surface (sliding surface) of the bore on which the piston reciprocates, Lubricating oil is supplied. Thus, as a pump that supplies lubricating oil to an engine, for example, a plunger pump that drives a plunger with an electromagnetic driving force and discharges the lubricating oil while compressing it is known (for example, see Patent Document 1). .

  This plunger pump is composed of a pump body, a suction passage that communicates with the pump chamber and sucks lubricating oil, a pump body that communicates with the pump chamber and discharges lubricating oil, and a plunger that reciprocates in the pump chamber ( Piston), solenoid rod that drives the plunger by electromagnetic force, spring that returns the plunger to the retracted position when de-energized, valve on the suction side that opens when the plunger retracts and allows lubricant to flow into the pump chamber from the suction passage When the plunger is pushed forward by the solenoid rod when energized and the lubricating oil in the pump chamber is compressed to a predetermined level, the valve on the discharge side is opened to discharge the lubricating oil from the pump chamber to the discharge passage. I have.

However, in this plunger pump, the plunger is formed so as to be detachable with respect to the solenoid rod or with respect to the cylinder member interposed between the solenoid rod, and when not energized, the solenoid rod moves backward in the direction away from the plunger. At the same time, the plunger returns to the retracted position by the biasing force of the spring.
Therefore, when foreign matter enters the plunger sliding interface, or when the lubricating oil becomes highly viscous at low temperatures, the plunger locks even when the spring return force is applied. There was a possibility that the plunger could not be returned to the predetermined retracted position and the return of the plunger would be worsened.

In addition, since the valve body composed of a ball valve and a spring is arranged on each of the suction side and the discharge side, there are problems that the number of parts is large, the structure of the pump body is complicated, and the assembly is complicated. .
Furthermore, since the two valve bodies are arranged in the vicinity of the pump chamber, the pump body is increased in size and the entire internal volume of the pump chamber cannot be effectively used as a compression space, and therefore the compression rate is reduced. However, there is a problem that a desired discharge pressure cannot be obtained.
JP-A-8-270571

  The present invention has been made in view of the above points, and the object of the present invention is to reduce the size by simplifying the structure and reducing the number of parts, etc. Plunger pump that can reliably operate the plunger even when high viscosity is generated, etc., and can obtain the desired discharge action. It is to provide.

A plunger pump according to a first aspect of the present invention includes a plunger that performs a pump action, a driving means that drives the plunger, a plunger that is slidably accommodated, and that defines passages for suction and discharge of fluid, inflow and outflow of fluid. A pump body that includes a solenoid rod that exerts a driving force in a reciprocating direction of the plunger, and a coupling that couples the plunger to the solenoid rod with a predetermined degree of freedom to interlock the plunger with the reciprocating movement of the solenoid rod. It has a configuration including members.
According to this configuration, when the driving means is activated, the solenoid rod reciprocates the plunger through the connecting member, and the fluid flowing into the pump body is compressed by the pump action of the plunger and discharged at a predetermined discharge pressure. To do.
Here, since the plunger is connected to the connecting member so as not to be detached with a predetermined degree of freedom, the viscosity of a fluid such as lubricating oil increases when a foreign object is caught in the sliding interface of the plunger. When the resistance force increases, and further when there is a variation in dimensional accuracy or assembly accuracy, the plunger and the solenoid rod are relatively appropriately moved within a predetermined degree of freedom and adjusted to the optimum position. Since the solenoid rod is forcibly reciprocated, the plunger operates reliably without locking at the sliding interface, and a desired discharge action can be obtained.

In the configuration according to the first aspect, the drive unit may employ a configuration including a spring that exerts a biasing force in the backward movement direction in which the plunger is retracted.
According to this configuration, when the plunger moves backward, the urging force of the spring becomes an auxiliary force, and the plunger can be moved smoothly. Further, when the plunger is retracted when the drive means is de-energized, the return operation of the solenoid rod and the plunger can be performed more smoothly by the biasing force of the spring.

A plunger pump according to a second aspect of the present invention includes a plurality of plungers that perform a pump action, a drive unit that drives the plurality of plungers, a plurality of plungers slidably accommodated in the same direction, and a fluid suction and A pump body defining a passage for discharge or inflow and outflow, and the driving means includes a solenoid rod that exerts a driving force in a reciprocating direction of the plurality of plungers, and a solenoid interposed between the solenoid rod and the plurality of plungers. It includes a connecting member that transmits a driving force in at least the forward movement direction of the rod and connects a plurality of plungers with a predetermined degree of freedom, and a spring that exerts an urging force in a backward movement direction that retracts the plurality of plungers. Yes.
According to this configuration, when the driving means is activated, the solenoid rod moves forward to drive the plunger via the connecting member, and the fluid that has flowed into the pump body is compressed by the pump action of the plunger so as to have a predetermined discharge pressure. Discharge with. On the other hand, the plurality of plungers return to the retracted position by the biasing force of the spring.
Here, since the plurality of plungers are connected to the connecting member so as not to be detached with a predetermined degree of freedom, the viscosity of a fluid such as lubricating oil or the like when a foreign object is caught in the sliding interface of some of the plungers. When the resistance increases and the dimensional accuracy or assembly accuracy varies, the plunger is appropriately moved within a predetermined degree of freedom relative to the connecting member and adjusted to the optimum position. Therefore, the plunger can operate reliably without locking at the sliding interface, and a desired discharge action can be obtained.
In other words, the on / off control of the drive means can provide a multi-discharge pump action that discharges fluid from a plurality of locations, and some plungers can stick or lock to cause variation in the discharge amount between them. It is possible to obtain a multi-discharge type plunger pump that can be prevented and has stable discharge characteristics as a whole.

In the configuration according to the second aspect, it is possible to adopt a configuration in which the connecting member is directly connected to the solenoid rod so as to transmit the driving force in the backward movement direction of the solenoid rod.
According to this configuration, when the solenoid returns, the driving force forcibly retracts the plurality of plungers via the connecting member, so that the plurality of plungers can be reciprocated more reliably without locking. Thus, stable multi-discharge characteristics can be obtained.

In the configuration according to the first and second aspects, the pump body includes a drive chamber that accommodates the plunger in a drivable manner, an inflow passage that allows fluid to flow into the drive chamber, an outflow passage that allows fluid to flow out of the drive chamber, A plunger passage that communicates with the drive chamber and reciprocally fits the plunger and delimits a pump chamber that sucks and compresses fluid in front of the plunger. The plunger moves backward to communicate the drive chamber and the pump chamber. A suction passage formed so as to block communication between the drive chamber and the pump chamber by the plunger when it moves forward, and a discharge passage communicating with the downstream side of the pump chamber. It is possible to adopt a configuration in which a valve element that opens at the above pressure is arranged.
According to this configuration, the fluid flows into the drive chamber from the inflow passage and out of the outflow passage (and circulates, for example, by an external circulation pump), while the plunger moves backward in the direction of jumping out of the plunger passage (intake) When the stroke is performed), the fluid accumulated in the drive chamber is sucked into the pump chamber through the suction passage, and when the plunger moves forward into the plunger passage (compression and discharge stroke is performed), the plunger closes the suction passage. At the same time, when the fluid in the pump chamber is compressed and the pressure becomes a predetermined pressure or higher, the valve body opens and the pressurized fluid in the pump chamber is discharged through the discharge passage.
Here, since the plunger also functions as a valve body for adjusting the fluid sucked into the pump chamber, the structure can be simplified and the number of parts can be reduced as compared with the conventional one. The plunger pump can be reduced in size while ensuring the compression rate.

In the configuration according to the first and second aspects, a configuration may be employed in which the spring is a compression type coil spring arranged coaxially around the plunger.
According to this configuration, the urging force of the coil spring acts evenly in the immediate vicinity of the plunger, so that it can act as an auxiliary force that causes the plunger to retract without tilting the plunger. In particular, when coil springs are arranged around a plurality of plungers, even if some of the plungers are likely to be locked due to foreign matter biting, etc., the biasing force of other coil springs via the connecting member Therefore, the lock can be reliably prevented.

In the configurations according to the first and second aspects, the connecting member may be configured by a flat disk that connects the plunger so as to be movable in a direction substantially perpendicular to the reciprocating direction of the plunger.
According to this configuration, the plunger is reciprocated in conjunction with the reciprocating movement of the solenoid rod to obtain a pump action, and when the connecting member and the plunger are connected to each other and the solenoid rod is directly connected to the connecting member. When the plunger is not coaxial with the passage (plunger passage) due to dimensional error or assembly error between the solenoid rod and other parts, the plunger moves appropriately with respect to the connecting member and automatically aligns. Since this is performed (alignment), smooth movement of the plunger can be ensured.

The structure which concerns on the said 1st and 2nd viewpoint WHEREIN: The plunger can employ | adopt the structure currently connected with respect to the connection member so that pivot is possible.
According to this configuration, when the solenoid rod is directly connected to the connecting member, the connecting member and the plunger are assembled with an inclination due to a dimensional error or an assembling error between the solenoid rod and the other. In such a case, the plunger is appropriately pivoted with respect to the connecting member, and the plunger and its passage (plunger passage) are automatically aligned, so that smooth movement of the plunger can be ensured.

In the configuration according to the first and second aspects, the plunger sequentially includes a columnar portion having a predetermined outer diameter, a neck portion having a diameter smaller than that of the columnar portion, and a head portion having a diameter larger than that of the neck portion. The disc may have a configuration including a through hole through which the head is inserted and a long hole formed continuously from the through hole and through which the neck is slid.
According to this configuration, when the plunger is connected to the connecting member, the head of the plunger is first passed through the through hole, and then the neck of the plunger is slid to be positioned in the long hole so that the disc is positioned on the head and the cylinder. The plunger can be easily connected so as not to drop off.
Further, a predetermined degree of freedom is ensured with respect to the plunger (the plunger is moved in a direction substantially perpendicular to the reciprocating direction of the plunger, and the lower surface of the head and the upper surface of the cylindrical portion are curved, for example. Thus, the plunger can be pivoted with the curved surface area as a fulcrum).

In the configuration according to the first and second aspects, the plunger sequentially includes a columnar portion having a predetermined outer diameter, a neck portion having a diameter smaller than that of the columnar portion, and a head portion having a diameter larger than that of the neck portion. The disc may have a configuration including a notch portion that is notched to a predetermined length from the outer edge toward the inside so that the neck portion can be slid and inserted.
According to this configuration, when the plunger is connected to the connecting member, the disk is sandwiched between the head portion and the cylindrical portion simply by first sliding the plunger neck from the outside and fitting it into the notch. Can be easily connected so as not to drop off.
Further, a predetermined degree of freedom is ensured with respect to the plunger (the plunger is moved in a direction substantially perpendicular to the reciprocating direction of the plunger, that is, along the notch, and, for example, the lower surface of the head and the upper surface of the cylindrical portion By using a curved surface, the plunger can be pivoted using the curved surface region as a fulcrum).

In the configuration according to the first and second aspects, the plunger includes a columnar portion having a predetermined outer diameter, a collar portion that is larger in diameter than the columnar portion, a neck portion that is smaller in diameter than the columnar portion, and a neck portion. The disc has a head that has a diameter that is larger than that of the disc, and the disc includes a through hole that allows the head to pass through, and a long hole that is formed continuously from the through hole and allows the neck to slide through. can do.
According to this configuration, when the plunger is connected to the connecting member, the head of the plunger is first passed through the through hole, and then the neck of the plunger is slid to be positioned in the long hole so that the disc is positioned on the head and the buttock. The plunger can be easily connected so as not to drop off.
In addition, the provision of the flange portion ensures a predetermined degree of freedom with respect to the plunger while reliably preventing it from falling out of the long hole (in a direction substantially perpendicular to the reciprocating direction of the plunger, that is, along the long hole). By moving the plunger, or by making the lower surface of the head and the upper surface of the buttocks into curved surfaces, the plunger can be easily pivoted while securely holding the plunger so that it does not fall off with the curved surface region as a fulcrum) be able to.

In the configuration according to the first and second aspects, the plunger includes a columnar portion having a predetermined outer diameter, a collar portion that is larger in diameter than the columnar portion, a neck portion that is smaller in diameter than the columnar portion, and a neck portion. In order to slide the neck part, the disc has a notch part cut out to a predetermined length from the outer edge to the inside so that the neck part can be inserted. can do.
According to this configuration, when the plunger is connected to the connecting member, the disk is sandwiched between the head and the butt by simply sliding the plunger neck from the outside and fitting it into the notch. Can be easily connected so as not to drop off.
In addition, the provision of the flange portion ensures a predetermined degree of freedom with respect to the plunger while reliably preventing the dropout from falling off (in a direction substantially perpendicular to the reciprocating direction of the plunger, that is, in the notch portion). By moving the plunger along, or by making the lower surface of the head and the upper surface of the buttocks curved, it is easy to pivot while securely holding the plunger so that it does not fall out of the curved surface area. Can).

  According to the plunger pump configured as described above, it is possible to reduce the size by simplifying the structure and reducing the number of parts, etc., but also locks when a foreign matter is caught or a fluid such as lubricating oil is increased in viscosity. Thus, the plunger can be reliably operated to obtain a desired discharge action, and in the case of the multi-discharge type, it is possible to prevent the discharge amount from being varied.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 5 show an embodiment of a plunger pump according to the present invention. FIG. 1 is a schematic sectional view, FIG. 2 is a plan view of a pump body, and FIG. 3 is a plan view of a connecting member (disk). 4 and 5 are a partial cross-sectional view and a partial enlarged cross-sectional view showing the relationship between the connecting member and the plunger. In this embodiment, the case where the plunger pump is applied to the engine E to supply lubricating oil as a fluid is shown.

As shown in FIG. 1, the plunger pump includes a pump body 10, four plungers 20 disposed in the pump body 10, and four valve bodies 30 disposed in the pump body 10 corresponding to the plungers 20. , Four coil springs 40 arranged corresponding to each plunger 20, a disk 50 as a connecting member for integrally connecting the four plungers 20, a solenoid 60 including a solenoid rod 61 abutting against the disk 50, etc. It has.
The coil spring 40, the disk 50, and the solenoid 60 constitute drive means for driving the plunger 20.

  As shown in FIGS. 1 and 2, the pump body 10 includes a driving chamber 11 that houses the plunger 20 in a drivable manner, an inflow passage 12 that allows the lubricating oil to flow into the driving chamber 11, and an outflow that causes the lubricating oil to flow out from the driving chamber 11. The passage 13 and the drive chamber 11 communicate with each other, and the four plunger passages 14 for fitting the plunger 20 in a reciprocating manner, the four discharge ports 15 formed at the tip of the plunger passage 14, and the downstream side of the discharge ports 15. Four discharge passages 16 for discharging pressurized lubricating oil, four suction passages 17 formed so as to communicate with the plunger passage 14, a stopper 18 for contacting the disk 50, and a lower end of the coil spring 40 are brought into contact with each other. Four annular grooves 19 and the like are provided.

The drive chamber 11 is formed in an upper region of the pump body 10 and is formed as a sealed space that is substantially flat in a direction perpendicular to the reciprocating direction of the plunger 20 in cooperation with an end yoke 67 of a solenoid 60 described later. The plunger 20 is drivably accommodated and the lubricating oil that has flowed in is temporarily stored.
As shown in FIG. 1, the inflow passage 12 is formed so that the lubricating oil supplied by a circulation pump or the like flows into the driving chamber 11, and the outflow passage 13 passes the lubricating oil that has flowed into the driving chamber 11 to the outside (for example, The oil pan of the engine E).

As shown in FIGS. 1 and 2, the four plunger passages 14 communicate with the drive chamber 11 and fit the plunger 20 in a reciprocating manner, and define a pump chamber P that sucks and compresses lubricating oil in front of the plunger passage 14. It is formed to do.
The four discharge ports 15 are formed to open at the distal ends of the respective plunger passages 14, and a seating surface 15 a on which the valve body 30 is seated is defined on the downstream end surface.

  As shown in FIGS. 1 and 2, the four discharge passages 16 are formed so as to be bent and communicated with each other in a substantially L shape on the downstream side of the plunger passage 14 (pump chamber) and the discharge port 15, respectively. The enlarged passage 16a extends in the same direction as the passage 14 to define the valve chamber, and the extended passage 16b extends perpendicularly from the enlarged passage 16a. A valve body 30 that opens and closes the discharge port 15 is disposed in the diameter-enlarged passage (valve chamber) 16a, and lubricating oil flows around the valve body 30.

  As shown in FIGS. 1 and 2, the four suction passages 17 are formed so as to communicate with the drive chamber 11 and the plunger passage 14, and the plunger 20 moves backward in the direction of jumping out of the plunger passage 14, thereby The pump chamber P is communicated, and when the plunger 20 advances a predetermined amount toward the plunger passage 14, the communication between the drive chamber 11 and the pump chamber P is cut off.

As shown in FIG. 1, the four valve bodies 30 have a valve portion 31 in which a portion seated on the valve seat 15a is formed in a conical surface, and the valve portion 31 is closed (the valve portion 31 is placed on the seat surface 15a). It is formed by a valve spring 32 that urges in the direction of seating.
In this way, the tip of the valve portion 31 is formed in a conical surface and protrudes toward the pump chamber P (in the passage region defining the discharge port 15), so that the dead volume that does not contribute to the pump action is minimized. be able to. As a result, the accumulation of air in the pump chamber P can be prevented as much as possible, and a desired compression rate (discharge pressure) can be ensured.

As shown in FIGS. 1, 3 to 5, the four plungers 20 are a cylindrical part 21 having a predetermined outer diameter and length, and a flange part integrally formed by expanding the diameter above the cylindrical part 21. 22, a neck portion 23 formed integrally with a diameter smaller than that of the cylindrical portion 21 above the collar portion 22, a head portion 24 formed integrally with an enlarged diameter above the neck portion 23, and the like.
The cylindrical portion 21 is slidably inserted (fitted) with respect to the plunger passage 14, and a pump chamber P is defined by the distal end surface (lower surface) and the plunger passage 14.

The collar portion 22 receives the upper end of the coil spring 40 at its lower side surface, and its upper side surface is formed as a curved surface that curves in a convex shape with the neck portion 23 as the uppermost point.
The neck portion 23 is formed to have a predetermined outer diameter smaller than that of the cylindrical portion 21, that is, reduced in diameter to an outer diameter that can be inserted into a long hole 53 of the disk 50 described later.
The head portion 24 is formed to have an outer diameter larger than that of the neck portion 23, that is, to an outer diameter that can be inserted through a through hole 52 of a disk 50 described later and cannot be inserted through a long hole 53. In addition, the lower side surface of the head 24 is formed as a curved surface that curves downward in a convex manner with the neck portion 23 as the lowest point.

As shown in FIGS. 1, 3, and 4, the disc 50 is housed in the drive chamber 11 and is formed in a thin disk shape so as to be reciprocable in the vertical direction. Abutting portion 51 that is in contact with each other, four circular through holes 52 that are arranged in the circumferential direction around the abutting portion 51, continuous to each through hole 52, and extends radially outward. The four long holes 53 are formed.
The four through holes 52 are each formed to have an inner diameter through which the head portion 24 of the plunger 20 is inserted.
The four long holes 53 are formed so as to be narrower than the head portion 24 of the plunger 20 and have a width that allows the neck portion 23 to slide.

When assembling the plunger 20 to the disk 50, as shown in FIG. 5, the head 24 is protruded upward through the through hole 52 from below, and the plunger 20 is slid radially outward with respect to the disk 50. Thus, the neck portion 23 is positioned in the region of the long hole 53.
As a result, the plunger 20 sandwiches the disk 50 between the head portion 24 and the flange portion 22, and in a direction substantially perpendicular to the reciprocating direction of the plunger 20 (in a plane direction substantially along the long hole 53 of the disk 50). ) It is movable and can be pivoted with the curved surface areas of the head portion 24 and the flange portion 22 of the plunger 20 as fulcrums, that is, connected to the disc 50 with a predetermined degree of freedom. Further, the disc 50 is applied with a driving force in a forward movement direction of a solenoid rod 61 (described later) through the contact portion 51.
The disk 50 may be directly connected to the solenoid rod 61 in the region of the contact portion 51 by screw fastening, caulking, welding, fitting and fixing, or may be molded integrally with the solenoid rod 61. Good.

  Then, the plunger 20 is fitted with a coil spring 40 to be described later around the cylindrical portion 21, and the plunger 20 (the cylindrical portion 21) is compressed while the lower end of the coil spring 40 is brought into contact with the annular groove 19 and compressed. The coil spring 40 is held in a compressed state between the annular groove 19 and the flange portion 22 by being assembled to the pump body 10 by being fitted to the plunger passage 14 and by being assembled with the solenoid 60 from above. Will be.

  The lower surface of the disk 50 abuts against the stopper 18 of the pump body 10 to define the end of the compression and discharge stroke, and the upper surface of the disk 50 is a stopper 62a defined by the lower end of the sheet member 62 of the solenoid 60 described later. In contact with each other, the end of the suction stroke and the rest position are defined.

  The four coil springs 40 are externally fitted coaxially around each plunger 20 (cylindrical portion 21) with play, and their lower ends are fitted into and contacted with the annular groove 19 of the pump body 10. Attached in a compressed state (at a predetermined compression allowance) so as to abut against the flange portion 21 (the lower surface thereof) of the plunger 20 and urge the plunger 20 in the direction of projecting out of the plunger passage 14 (retracted position). ing.

  Thus, by arranging the coil spring 40 coaxially around the plunger 20, the biasing force acts evenly in the immediate vicinity of the plunger 20, and biases the plunger 20 toward the retracted position without tilting. It will give the auxiliary power to do. In addition, since the upper end of the coil spring 40 is not in direct contact with the lower surface of the disk 50 but is in contact with the flange portion 22, the degree of freedom of the plunger 20 in the connection region with the disk 50 is suppressed. Instead, the plunger 20 can move and pivot along the plane of the disk 50 within a predetermined range with respect to the disk 50.

As shown in FIG. 1, the solenoid 60 includes a solenoid rod 61, a substantially cylindrical sheet member 62, a sleeve 63 that slidably guides the solenoid rod 61, a bobbin 64, and an exciting coil wound around the bobbin 64. 65, a solenoid spring 66 that biases the solenoid rod 61 in one direction, an end yoke 67 that forms a magnetic path, an outer yoke 68, and the like.
The solenoid spring 66 exerts an urging force for suppressing rattling of the solenoid rod 61, and is set so as to generate an urging force that is smaller than the urging forces of the four coil springs 40 and in opposite directions.
The end yoke 67 is formed in a flat plate shape and is joined to the upper end surface of the pump body 10. That is, the end yoke 67 cooperates with the pump body 10 to define the drive chamber 11 as a substantially flat space.

  That is, when a predetermined energization is applied to the coil 65, the solenoid 60 generates an electromagnetic driving force and moves forward in the direction in which the solenoid rod 61 protrudes from the sheet member 62, while the coil 65 is de-energized. The solenoid rod 61 moves backward in the direction of entering the seat member 62 by the static magnetic attractive force and the biasing force of the coil spring 40 against the biasing force of the solenoid spring 66.

Next, the operation of this plunger pump will be described.
First, when not driven (when the coil 65 is in a non-energized state), the four plungers 20 are retracted in the direction of jumping out of the plunger passage 14 by the biasing force of the coil spring 40, and the disk 50 comes into contact with the stopper 62a. It has stopped. In this non-driven state, the suction passage 17 is in communication with the pump chamber P and the inflow passage 12, the valve body 30 is closed, and the pump chamber P is filled with lubricating oil.

When the engine E is started from this state, a circulation pump (not shown) is operated, and the lubricating oil flows into the drive chamber 11 from the inflow passage 12 and out of the outflow passage 13 to circulate in the engine E.
When energization of the coil 65 is turned on at a predetermined timing, the forward movement in the direction in which the solenoid rod 61 protrudes is started by the electromagnetic driving force generated in the solenoid 60 and the disk 50 is pushed down. Then, in conjunction with the disk 50, the plunger 20 moves forward into the plunger passage 14, and the plunger 20 (side surface) blocks communication between the suction passage 17 and the pump chamber P as shown in FIGS. At that time, the compression of the pump chamber P is started.
When the plunger 20 further moves forward and the lubricating oil in the pump chamber P reaches a pressure higher than a predetermined pressure, the valve body 30 opens and the disk 50 comes into contact with the stopper 18 and stops. The oil is supplied to a predetermined lubrication region of the engine E through the discharge port 15 and the discharge passage 16. Thereby, one multiple discharge stroke by the four plungers 20 is completed.

On the other hand, when the energization to the coil 65 is turned off, the generated electromagnetic driving force disappears, so the four plungers 20 are retracted in the direction of jumping out of the plunger passage 14 by the urging force of the coil spring 40, and The solenoid rod 61 moves backward in the direction to be buried by the biasing force of the coil spring 40 and the static magnetic attractive force, and the disk 50 comes into contact with the stopper 62a and stops.
At this time, the plunger 20 opens the suction passage 17 so as to communicate with the pump chamber P, and the lubricating oil accumulated in the inflow passage 12, the drive chamber 11, and the outflow passage 13 is sucked into the pump chamber P, and the suction stroke is reduced. Complete.

  Here, since the four plungers 20 are connected to the disk 50 with a predetermined degree of freedom, for example, when a foreign object is caught in the sliding interface of one plunger 20 or the viscosity of a fluid such as lubricating oil is low. Even when the resistance force increases and the resistance force increases, the four plungers 20 are locked at the sliding interface (in the plunger passage 14) because they are surely returned to the retracted position by the biasing force of the coil spring 40 of the other plunger 20. Therefore, the desired suction action and discharge action can be obtained, and as a result, variations in the discharge amount of the lubricating oil discharged from the four discharge passages 13 are suppressed.

  Further, even if there is a variation in dimensional accuracy or assembly accuracy among the plunger 20, the disk 50, the plunger passage 14 of the pump body 10, etc., the plunger 20 is planarly extended along the long hole 53 within a predetermined range. Since it can move and pivot, it can reciprocate smoothly without sticking or locking at the sliding interface (in the plunger passage 14).

  In addition, since the plunger 20 also functions as a valve body that opens and closes the pump chamber P, the structure can be simplified and the number of parts can be reduced as compared with the conventional one, and the pump chamber P can be used effectively to achieve a desired compression rate. The plunger pump can be reduced in size while ensuring.

  6 to 8 show another embodiment of the plunger pump according to the present invention. The same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 6 is a plan view of the disk 50 ′, and FIGS. 7 and 8 are a partial cross-sectional view and a partial enlarged cross-sectional view showing the relationship between the disk 50 ′ and the plunger 20.

In this plunger pump, as shown in FIGS. 6 to 8, the disk 50 ′ is formed by contacting the solenoid rod 61 with the contact portion 51 being radially arranged around the contact portion 51 in the circumferential direction. The four cutout portions 54 'are provided.
The four cutouts 54 ′ are narrower than the head 24 of the plunger 20 and are wide enough to slide the neck 23 so that the neck 23 of the plunger 20 can be slid from the outside. It is cut out to a predetermined length toward.

When assembling the plunger 20 to the disk 50 ', as shown in FIG. 8, the neck 23 is slid along the notch 54' from the radially outer side of the disk 50 'to be positioned in a predetermined area inside.
As a result, the plunger 20 sandwiches the disk 50 ′ between the head portion 24 and the flange portion 22, and in a direction substantially perpendicular to the reciprocating direction of the plunger 20 (along the cutout portion 54 ′ of the disk 50 ′). It is movable (in a plane) and is pivotable with the curved surface areas of the head 24 and the flange 22 of the plunger 20 as fulcrums, that is, connected to the disk 50 ′ with a predetermined degree of freedom. Become. Further, the disc 50 ′ is applied with a driving force in the forward movement direction of a solenoid rod 61 described later via the contact portion 51.
The disk 50 ′ may be directly connected to the solenoid rod 61 in the region of the contact portion 51 by screw fastening, caulking, welding, fitting and fixing, etc., or may be molded integrally with the solenoid rod 61. Also good.

  Then, the plunger 20 is fitted with a coil spring 40 to be described later around the cylindrical portion 21, and the plunger 20 (the cylindrical portion 21) is compressed while the lower end of the coil spring 40 is brought into contact with the annular groove 19 and compressed. The coil spring 40 is held in a compressed state between the annular groove 19 and the flange portion 22 by being assembled to the pump body 10 by being fitted to the plunger passage 14 and by being assembled with the solenoid 60 from above. Will be.

  That is, according to this embodiment, when the plunger 20 is connected to the disk 50 ′, the neck portion 23 of the plunger 20 is first slid from the outside and fitted into the notch 54 ′ so that the disk 50 ′ is moved to the head. It will be in the state pinched | interposed between 24 and the collar part 22, and it can connect easily so that the plunger 20 may not drop | omit.

  Further, the plunger 20 can be moved in a plane along a direction substantially perpendicular to the reciprocating direction of the plunger 20, that is, the notch portion 54 ′, and the lower surface of the head 24 and the upper surface of the flange portion 22 are curved. Since it can be pivoted with the surface region as a fulcrum, when a foreign object is caught in the sliding interface of some of the plungers 20 or when the viscosity of a fluid such as lubricating oil is increased and resistance is increased, When there is a variation in dimensional accuracy or assembly accuracy, the plunger 20 is appropriately moved within the range of a predetermined degree of freedom with respect to the disk 50 'and adjusted to an optimum position, and the plunger 20 is locked at the sliding interface. It is possible to obtain the desired inhalation and ejection action without fail by operating reliably.

In the above-described embodiment, the plunger 20 is integrally provided with the column portion 21, the flange portion 22, the neck portion 23, and the head portion 24. However, the plunger 20 is not limited to this, and FIG. , (B), a plunger 20 ′ having a cylindrical part 21, a neck part 23, and a head part 24 and not having the aforementioned collar part 22 may be employed.
In the above embodiment, the lower surface of the head 24 and the upper surface of the flange portion 22 or the cylindrical portion 21 are formed as curved surfaces so that the plungers 20 and 20 ′ are pivotally connected to the disks 50 and 50 ′. However, the present invention is not limited to this, and the lower surface of the head and the upper surface of the buttocks or the cylindrical portion may be formed as a flat surface, and the degree of freedom may be limited only to planar movement. Alternatively, another configuration may be adopted to pivotally connect the plunger to the coupling member.

In the above embodiment, the case where the solenoid rod 61 abuts against the disks 50 and 50 ′ and exerts a driving force has been described. However, the present invention is not limited to this, and the disks 50 and 50 ′ are connected to the solenoid rod 61. May be directly coupled to the solenoid rod 61 so as to be forcibly linked to the reciprocating motion of the solenoid rod 61.
In the above embodiment, the case where a plurality of plungers 20 are connected to one connecting member (disks 50 and 50 ') with a predetermined degree of freedom has been described. However, the present invention is not limited to this. In the configuration in which the connecting member is directly connected, one plunger may be connected to the connecting member with a predetermined degree of freedom.

  In the above-described embodiment, the case where the lubricating oil of the engine E is sucked and discharged is shown as an object to which the plunger pump is applied. However, the present invention is not limited to this, and other fluids other than the lubricating oil are sucked. It may be applied to discharge.

  As described above, the plunger pump of the present invention achieves a reduction in size by simplifying the structure and reducing the number of parts, etc., and when a foreign matter is caught or a fluid such as lubricating oil is increased in viscosity. In addition, since the plunger can be reliably operated by avoiding the lock and the desired discharge action can be obtained, it can of course be applied to a rotary engine or a two-cycle reciprocating engine that needs to suck and discharge the lubricating oil. In addition, it is useful for supplying lubricating oil for other engines, and for machines or devices that need to suck and discharge fluids other than lubricating oil.

It is a schematic sectional drawing which shows one Embodiment of the plunger pump which concerns on this invention. It is a top view of the pump body which makes a part of plunger pump shown in FIG. It is a top view of the connection member (disk) which makes a part of plunger pump shown in FIG. FIG. 1 is a partially enlarged sectional view in which a part of the plunger pump is enlarged in FIG. 1. FIG. 1 is a partially enlarged sectional view in which a part of the plunger pump is enlarged in FIG. 1. The other embodiment of the plunger pump which concerns on this invention is shown, and it is a top view of the connection member (disk). It is the elements on larger scale which expanded a part of plunger pump using the connection member (disk) shown in FIG. It is the elements on larger scale which expanded a part of plunger pump using the connection member (disk) shown in FIG. (A), (b) is the elements on larger scale which show other embodiment of the plunger pump which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump body 11 Drive chamber 12 Inflow passage 13 Outflow passage 14 Plunger passage P Pump chamber 15 Discharge port 16 Discharge passage 17 Intake passage 18 Stopper 19 Annular groove 20, 20 'Plunger 21 Cylindrical part 22 Girder part 23 Neck part 24 Head part 30 Valve Body 31 Valve portion 32 Valve spring 40 Coil spring (drive means)
50, 50 'disc (connection member, drive means)
51 Contact part 52 Through hole 53 Long hole 54 'Notch part 60 Solenoid (drive means)
61 Solenoid rod 62 Sheet member 62a Stopper 63 Sleeve 64 Bobbin 65 Coil 66 Solenoid spring 67 End yoke 68 Outer yoke

Claims (12)

A plunger that performs a pumping action, a driving means that drives the plunger, and a pump body that slidably accommodates the plunger and defines a passage for fluid intake and discharge or inflow and outflow,
The driving means includes a solenoid rod that exerts a driving force in the reciprocating direction of the plunger, and a connecting member that connects the plunger to the solenoid rod with a predetermined degree of freedom so as to interlock the plunger with the reciprocating motion of the solenoid rod. ,including,
Plunger pump characterized by that. The drive means includes a spring that exerts an urging force in a backward movement direction for retracting the plunger.
The plunger pump according to claim 1. A plurality of plungers that act as a pump, a drive means that drives the plurality of plungers, a pump that slidably accommodates the plurality of plungers in the same direction, and that defines a passage for suctioning and discharging or inflow and outflow of fluid Body
The driving means transmits a driving force in at least the forward movement direction of the solenoid rod via a solenoid rod that exerts a driving force in the reciprocating direction of the plurality of plungers and between the solenoid rod and the plurality of plungers. And a connecting member that connects the plurality of plungers with a predetermined degree of freedom, and a spring that exerts an urging force in a backward movement direction that retracts the plurality of plungers.
Plunger pump characterized by that. The connecting member is directly connected to the solenoid rod so as to transmit a driving force in the backward movement direction of the solenoid rod.
The plunger pump according to claim 3. The pump body communicates with the drive chamber while accommodating the drive chamber for driving the plunger, an inflow passage for allowing fluid to flow into the drive chamber, an outflow passage for allowing fluid to flow out from the drive chamber, and the plunger. A plunger passage defining a pump chamber for sucking and compressing fluid in a reciprocating manner, and the drive chamber and the pump chamber communicating with each other by retreating the plunger and the plunger is advanced by a predetermined amount. A suction passage formed so as to block communication between the drive chamber and the pump chamber by the plunger, and a discharge passage communicating with the downstream side of the pump chamber,
The discharge passage is provided with a valve element that opens when the fluid in the pump chamber is at a predetermined pressure or higher.
The plunger pump according to any one of claims 1 to 4, wherein the plunger pump is provided. The spring is a compression type coil spring disposed in a coaxially compressed state around the plunger.
The plunger pump according to claim 2 or 3, characterized in that. The connecting member comprises a flat disk that connects the plunger so as to be movable in a direction substantially perpendicular to the reciprocating direction of the plunger.
The plunger pump according to any one of claims 1 to 6, wherein The plunger is pivotally connected to the connecting member;
The plunger pump according to any one of claims 1 to 7, wherein The plunger sequentially has a cylindrical portion having a predetermined outer diameter, a neck portion having a diameter smaller than that of the cylindrical portion, and a head portion having a diameter larger than that of the neck portion,
The disk includes a through-hole through which the head is inserted, and a long hole that is formed continuously with the through-hole and allows the neck to slide through.
The plunger pump according to claim 7 or 8, characterized in that. The plunger sequentially has a cylindrical portion having a predetermined outer diameter, a neck portion having a diameter smaller than that of the cylindrical portion, and a head portion having a diameter larger than that of the neck portion,
The disk includes a notch portion that is notched to a predetermined length from the outer edge toward the inside so as to allow the neck portion to slide and be inserted.
The plunger pump according to claim 7 or 8, characterized in that. The plunger includes a cylindrical portion having a predetermined outer diameter, a flange portion that is larger in diameter than the cylindrical portion, a neck portion that is smaller in diameter than the cylindrical portion, and a head portion that is larger in diameter than the neck portion. In order,
The disk includes a through-hole through which the head is inserted, and a long hole that is formed continuously with the through-hole and allows the neck to slide through.
The plunger pump according to claim 7 or 8, characterized in that. The plunger includes a cylindrical portion having a predetermined outer diameter, a flange portion that is larger in diameter than the cylindrical portion, a neck portion that is smaller in diameter than the cylindrical portion, and a head portion that is larger in diameter than the neck portion. In order,
The disk includes a notch portion that is notched to a predetermined length from the outer edge toward the inside so as to allow the neck portion to slide and be inserted.
The plunger pump according to claim 7 or 8, characterized in that.

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