JP2008231947A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump miniaturized and enhanced in reliability, durability, efficiency, and economic efficiency. <P>SOLUTION: This vane pump comprises a housing having pump compartments formed in the columnar space at generally equal intervals and a motor 5 which are formed integrally with each other. In the motor, the rotor 3 is formed in a bottomed cylindrical shape having an opened one end and a closed other end, annular magnets 9 multipolar-magnetized are disposed on the inner peripheral surface of the rotor 3 having vanes 12, and a fixed armature 16 is installed inside the magnets 9 through the housing 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vane pump used for, for example, a drive source of a power steering device of a vehicle.

  Conventionally, for example, a vane pump is provided in a drive source of a power steering device of a vehicle. This vane pump has a rotor in which a plurality of vanes are provided on an outer peripheral surface so as to be able to protrude and retract in a radial direction, and a columnar space in which the rotor is rotatably disposed. A cam surface is provided on the inner peripheral surface, and a housing that forms a pump chamber in the cylindrical space together with the rotor and the vane is provided. Further, there are a vane pump having a structure in which the center of the rotor is eccentric with respect to the center of the casing (for example, see Patent Document 1) and a vane pump having a structure in which the rotor is not eccentric (for example, see Patent Document 2).

  In a structure in which the center of the rotor is eccentric with respect to the center of the casing as in the vane pump shown in Patent Document 1, the pressure is not balanced, and the pressure is applied non-axisymmetrically to the rotor. large. For this reason, the shafts and bearings were worn quickly and had a short life.

On the other hand, in the structure in which the center of the rotor is provided at the center of the casing as in the vane pump shown in Patent Document 2, since the pressure is balanced, the pressure is applied symmetrically with respect to the rotor. The load is small. Therefore, there is an advantage that the shaft and the bearing are less worn and the life is long.
JP-A 61-53483. JP 2006-125327 A.

  However, in the structure of the vane pump described in Patent Document 2, since the power source is outside the casing, sealing is necessary between the drive shaft connected to the power source and the rotor so that the medium inside does not leak. Become. Since sealing is a source of frictional resistance, it has a lot of mechanical loss, is easily damaged, and has a weak point in life. Furthermore, since the power source is outside the casing, the overall dimensions are large. Further, since the casing, the port plate, and the cam ring are separate bodies, the number of parts is large, which is disadvantageous in terms of cost.

  Therefore, a technical problem to be solved in order to achieve miniaturization, reliability, durability, high efficiency, and improvement in economic efficiency arises, and the present invention aims to solve this problem. .

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a plurality of rotors that are rotationally driven, and a plurality of rotatively attached to slots formed in the rotor. And a cylindrical space in which the rotor is rotatably disposed, and an elliptical cam surface is provided on the inner peripheral surface of the cylindrical space, together with the rotor and the vane. A port plate having a housing in which a plurality of pump chambers are formed at substantially equal intervals in the cylindrical space, a suction port and a discharge port communicating with the plurality of pump chambers, and disposed on one axial side of the housing The rotor is formed in a bottomed cylindrical shape with one end opened and the other end closed, and multipolar magnetization is applied to the inner peripheral surface, and the inner peripheral wall of the rotor The Providing data and a magnet integrally rotatably provided annular, a vane pump having a motor consisting of a fixed armature disposed opposite the inside of the magnet through said housing.

According to this configuration, (1) an annular magnet that rotates integrally with the rotor is provided on the inner peripheral wall of the rotor, and a fixed armature is provided inside the magnet via a housing, so that a motor as a drive source is provided. A compact vane pump with a built-in motor can be obtained.
(2) Since the magnet and the fixed armature constituting the motor are provided via the housing, the medium and the current-carrying part are separated even when liquid or the like is used as the medium. There is no leakage.
(3) Since the rotor can be hermetically sealed with the housing and the port plate, the sealing around the axis, which is a movable part, which has been necessary in the past, becomes unnecessary.
(4) Since a balanced vane pump in which the pressure distribution is axisymmetric can be realized, the life can be extended.

  A second aspect of the present invention provides the vane pump according to the first aspect, wherein the cam surface is formed integrally with the housing on the inner peripheral surface of the housing.

  According to this configuration, the number of parts can be reduced by integrating the cam surface with the housing, which has conventionally been configured with a casing, a cam ring, and a port plate. Further, since the cam ring is integrated with the housing, no assembly is required, so that the assembly man-hour is reduced and the assembly error is eliminated. Furthermore, since the joint is eliminated, leakage of liquid or the like can be eliminated.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the rotor is rotated via a bearing on a support shaft having one end attached to the port plate and the other end attached to the housing. Provide a vane pump that can be installed.

  According to this configuration, since the rotor can be hermetically sealed with the housing and the port plate, sealing around the axis, which has been conventionally required, becomes unnecessary.

  According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, two pump chambers are provided at equal intervals, and the suction port and the discharge port are connected to each pump chamber in common. Provided is a vane pump in which a medium is supplied to each pump chamber and a medium is discharged from each pump chamber at two locations simultaneously.

  According to this configuration, the suction port and the discharge port are respectively connected in common to the two pump chambers, and supply of the medium to each pump chamber and discharge of the medium from each pump chamber are performed simultaneously at two locations. A balanced vane pump in which the pressure distribution is axisymmetric can be realized. In addition, mold forming becomes possible.

  A fifth aspect of the present invention provides the vane pump according to the first, second, third, or fourth aspect, wherein the magnet is magnetized on the rotor itself.

  According to this configuration, the number of parts can be reduced by making the magnet magnetized on the rotor itself. Further, by integrating the magnet with the rotor, no assembly is required, and the number of assembly steps is reduced and at the same time assembly errors are eliminated.

According to the first aspect of the present invention, since a motor as a drive source can be built in in a compact manner, a small vane pump with a built-in motor can be obtained. Further, even when a liquid or the like is used as a medium, the medium and the energization unit are separated, so that the liquid or the like does not leak into the energization unit, and the reliability and durability are improved. Furthermore, since the sealing around the axis, which is a movable part that has been necessary in the past, is no longer necessary, the durability and the reliability with respect to liquid leakage are improved, and high efficiency can be achieved. In addition, since a balanced vane pump in which the pressure distribution is axisymmetric can be realized, the life can be extended.

  The invention according to claim 2 integrates the cam surface with the housing to reduce the number of assembling steps, and at the same time, eliminates the assembly error and eliminates the joints. Therefore, in addition to the effect of the invention of claim 1, the cost is further reduced. And improved reliability.

  In the invention according to claim 3, since the rotor can be sealed with the housing and the port plate, the sealing around the axis, which has been conventionally required, becomes unnecessary, and in addition to the effect of the invention of claim 1 or 2, the durability, Improvements in reliability and efficiency can be expected.

  Since the invention according to claim 4 can realize a balanced vane pump in which the pressure distribution is axially symmetric, the life can be further extended in addition to the effects of the invention of claim 1, 2 or 3. Moreover, it becomes a structure which can be mold-molded, and the effect that it can be manufactured at low cost can be expected.

  The invention according to claim 5 can reduce the number of parts and at the same time reduce the number of assembly steps. Therefore, in addition to the effect of the invention of claim 1, 2, 3, or 4, it becomes more advantageous in terms of cost and improves economy. The effect of doing can be expected. Also, assembly errors are eliminated and quality is improved.

  In order to achieve the objectives of miniaturization, reliability, durability, high efficiency and economic efficiency, etc., the rotor that is driven to rotate and a slot that is formed in the rotor are mounted so as to be able to appear and retract in the radial direction. The rotor has a plurality of vanes formed therein and a cylindrical space in which the rotor is rotatably disposed, and an elliptical cam surface is provided on an inner peripheral surface of the cylindrical space. And a housing that forms a plurality of pump chambers in the columnar space together with vanes at substantially equal intervals, a suction port and a discharge port that communicate with the plurality of pump chambers, and is disposed on one axial side of the housing. The rotor is formed in a bottomed cylindrical shape having one end opened and the other end closed, and multipolar magnetization is applied to the inner circumferential surface, and the rotor Inner circumference It was achieved by providing the said rotor and integrally rotatably provided annular magnets, the motor comprising at a fixed armature disposed opposite the inside of the magnet through the housing.

  Hereinafter, the vane pump of the present invention will be described with reference to preferred embodiments. 1 to 3 show an embodiment of a vane pump according to the present invention. FIG. 1 is a sectional view of the same pump cut along a plane parallel to the rotation axis of the rotor, and FIG. 2 is a plane perpendicular to the rotation axis of the rotor. FIG. 3 is a cross-sectional view of the above-mentioned pump cut by the above, FIG.

  1 to 3, the vane pump 1 includes a housing 2, a rotor 3, a port plate 4, and a motor 5. In the following description, the side on which the housing 2 is provided in FIG. 1 will be described as the lower side, and the side on which the port plate 4 is provided will be described as the upper side.

The housing 2 has an outer bottomed cylindrical portion 2A having an opening surface on the upper side, and is folded upward at a right angle from the inside of the bottom wall 2a of the outer bottomed cylindrical portion 2A to have an opening surface on the lower side. The intermediate bottomed cylindrical portion 2B and the inner bottomed cylindrical portion 2C that is folded downward at a right angle from the inside of the bottom wall 2b of the intermediate bottomed cylindrical portion 2B and has an open surface on the upper side are concentric. And is integrally formed of a metal material. An elliptical cam surface 6 is formed on the inner peripheral wall of the outer bottomed cylindrical portion 2A, and a thrust bearing recess 7 is provided on the bottom 2c of the inner bottomed cylindrical portion 2C.

  The rotor 3 is formed in a bottomed cylindrical shape having one end (upper surface) side closed and the other end (lower surface) side opened, and a cylindrical bearing protruding toward the lower side (inner side) at the center. The holding part 8 is provided integrally. An annular magnet 9 is fixedly attached to the inner peripheral wall of the rotor 3, and a pair of bearings 10, 10 are attached to the inner peripheral wall of the bearing holding portion 8 so as to be separated in the vertical direction. When the rotor 3 to which the magnet 9 and the pair of bearings 10 and 10 are attached faces the opening side toward the housing 2, the outer peripheral portion thereof is the outer bottomed cylindrical portion 2 </ b> A and the intermediate bottomed cylindrical portion. 2B, the bearing holding portion 8 is received in the inner bottomed cylindrical portion 2C and can be rotatably accommodated in the housing 2.

  The rotor 3 is formed with a plurality of vane grooves 11, 11... Radially about the bearing holding portion 8, and the tip of each vane groove 11, 11. The vane 12 is accommodated so that it can move freely in the radial direction of contact. The rotor 3 is housed in the housing 2 together with the vanes 12, and the two pump chambers 13, 13 are arranged at substantially equal intervals, that is, shafts, in the housing 2 by the rotor 3, the vanes 12, and the elliptical cam surface 6. Form symmetrically.

  The port plate 4 is attached to the upper surface of the housing 2 housing the rotor 3 so as to cover the upper surface opening of the housing 2. As shown in FIG. 4, the port plate 4 is sucked into the housing 2 and two suction ports 14, 14 having an arc shape for sucking oil into the housing 2 on the surface (bottom surface) facing the rotor 3. Two arc-shaped discharge ports 15 and 15 for discharging the oil liquid are provided. Each of the suction ports 14, 14 is connected to one through a suction communication passage 14 a provided through the port plate 4 and communicates with the supply-side nozzle 18, and the discharge ports 15, 15 also pass through the port plate 4. A discharge communication passage 15 a provided therethrough communicates with the discharge side nozzle 15 and communicates with the discharge-side nozzle 19. Further, a shaft hole 20 for inserting and holding one end portion of the shaft 17 is provided at the center of the surface facing the rotor 3.

  The motor 5 has a columnar shape outside the housing 2 between the magnet 9 attached to the inner peripheral wall of the rotor 3 and between the intermediate bottomed cylindrical portion 2B and the inner bottomed cylindrical portion 2C of the housing 2. The armature 16 is housed in a space and fixedly attached to the housing 2. That is, the fixed armature 16 accommodated in the columnar space between the intermediate bottomed cylindrical part 2B and the inner bottomed cylindrical part 2C of the housing 2 is coaxial with the magnet 9 and outside the housing 2 The magnet 9 is housed inside. The magnet 9 is configured as a multi-pole magnetized annular magnet formed by alternately applying N and S magnetic poles at equal intervals in the circumferential direction on the inner peripheral surface. It has an armature core provided with a plurality of salient pole portions corresponding to the magnetic poles of the magnet 9, and a predetermined number of coils are wound around each salient pole portion. The structure of the motor 5 is a generally known brushless motor structure. When a current determined by a drive circuit (not shown) is passed through the coil of the fixed armature 16, the magnet 9 is moved to the rotor 3. It is configured to rotate as a unit.

  Next, an example of an assembly procedure of the vane pump 1 configured as described above will be described. First, the housing 2 to which the fixed armature 16 of the motor 5 is attached outside is prepared. In the cylindrical space between the outer bottomed cylindrical portion 2A and the intermediate bottomed cylindrical portion 2B of the housing 2, the rotor 3 to which the magnet 9, the vanes 12, 12. Subsequently, the shaft 17 is passed through the bearings 10 and 10 and accommodated in the bearing holding portion 8. Next, one end of the shaft 7 is fitted into the shaft hole 20, the port plate 4 is disposed on the housing 2, and the housing 2 and the port plate 4 are aligned with each other by means (not shown) (not shown). Once fixed, assembly is complete.

  The basic operation of the vane pump 1 having such a structure is as follows. When a current determined by the drive circuit flows through the coil of the fixed armature 16 and the magnet 9 starts to rotate integrally with the rotor 3, the vane 12 protrudes outward of the rotor 3 by the centrifugal force and contacts the cam surface 6. Touch. When the rotor 3 continues to rotate with the vane 12 in contact with the cam surface 6, the volume of the pump chambers 13, 13 formed by the rotor 3, the vane 12 and the cam surface 6 of the housing 2 increases and decreases as the rotor 3 rotates. Then, in the series of operations, the liquid is simultaneously sucked into the pump chambers 13 and 13 through the supply side nozzle 18 at the suction ports 14 and 14, and the pump chambers 13 and 13 are discharged at the discharge ports 15 and 15. The pump is operated so that the liquids are simultaneously discharged through the discharge-side nozzle 19.

  Therefore, according to the vane pump 1 in the present embodiment, the annular magnet 9 that rotates integrally with the rotor 3 is provided on the inner peripheral wall of the rotor 3, and the fixed armature 16 is provided inside the magnet 9 via the housing 2. Since the motor 5 as a drive source is built in, the small vane pump 1 with the built-in motor 5 can be obtained.

  In addition, the pump chambers 13 and 13 are provided symmetrically, and the suction port 14 and the discharge port 15 are connected to the two pump chambers 13 and 13, respectively, and the suction and discharge of liquid are performed simultaneously for the two pump chambers 13 and 13, respectively. As a result, a balanced vane pump in which the pressure distribution is axisymmetric is obtained, and the life can be extended.

  Further, since the magnet 9 and the fixed armature 16 constituting the motor 5 are provided via the housing 2, the medium and the energizing portion (fixed armature 16) are separated even when the liquid is used as the medium. The liquid does not leak into the current-carrying part, and the reliability and durability are improved.

  Further, since the rotor 3 is hermetically sealed with the housing 2 and the port plate 4, sealing around the shaft is unnecessary, and durability and reliability against liquid leakage are improved, and friction loss is reduced. Efficiency can be improved.

  Further, since the cam surface 6 is integrated with the housing 2, the number of parts and the number of assembling steps are reduced, and at the same time, the assembling error is reduced.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  For example, in the above embodiment, a vane pump that handles liquid as a medium has been described. However, the present invention can also be applied to a vane pump that handles air or the like as a medium.

  In the above-described embodiment, the example in which the magnet 9 is configured separately from the rotor 3 has been described. However, the magnet 9 may be provided by being magnetized on the rotor 3 itself.

Sectional drawing which cuts and shows the vane pump which concerns on one embodiment of this invention in the surface parallel to the rotating shaft of a rotor. Sectional drawing which cuts and shows a vane pump same as the above by the surface perpendicular | vertical to the rotating shaft of a rotor. The principal part disassembled perspective view of a vane pump same as the above. The bottom view of the port plate in a vane pump same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vane pump 2 Housing 2A Outer bottomed cylindrical part 2B Middle bottomed cylindrical part 2C Inner bottomed cylindrical part 3 Rotor 4 Port plate 5 Motor 6 Cam surface 8 Bearing holding part 9 Magnet 10 Bearing 11 Vane groove 12 Vane 13 Pump chamber 14 Suction Port 15 Discharge port 16 Fixed armature 17 Axis

Claims (5)

A rotor that is rotationally driven, a plurality of vanes that are attached to slots formed in the rotor so as to be freely projecting and retracting in a radial direction, and a columnar space in which the rotor is rotatably disposed. A housing in which an elliptical cam surface is provided on an inner peripheral surface of the cylindrical space, and a plurality of pump chambers are formed at substantially equal intervals in the cylindrical space together with the rotor and vanes, and the plurality of pump chambers A vane pump having a suction port and a discharge port leading to a port plate disposed on one axial side of the housing,
The rotor is formed in a bottomed cylindrical shape with one end opened and the other end closed,
An annular magnet magnetized on the inner peripheral surface and provided on the inner peripheral wall of the rotor so as to rotate integrally with the rotor, and a fixing provided facing the inside of the magnet via the housing A vane pump comprising a motor composed of an armature.   The vane pump according to claim 1, wherein the cam surface is formed integrally with the housing on an inner peripheral surface of the housing.   3. The vane pump according to claim 1, wherein the rotor is rotatably attached to a support shaft having one end attached to the port plate and the other end attached to the housing via a bearing.   Two pump chambers are provided at equal intervals, and the suction port and the discharge port are provided commonly connected to each pump chamber, respectively, to supply the medium to each pump chamber and to discharge the medium from each pump chamber. The vane pump according to claim 1, 2 or 3, characterized in that it is performed at two places simultaneously.   5. A vane pump according to claim 1, wherein the magnet is magnetized on the rotor itself.

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