WO2009157259A1 - 電動ポンプ装置 - Google Patents
電動ポンプ装置 Download PDFInfo
- Publication number
- WO2009157259A1 WO2009157259A1 PCT/JP2009/058986 JP2009058986W WO2009157259A1 WO 2009157259 A1 WO2009157259 A1 WO 2009157259A1 JP 2009058986 W JP2009058986 W JP 2009058986W WO 2009157259 A1 WO2009157259 A1 WO 2009157259A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brush
- commutator
- pump device
- electric pump
- contact
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D5/00—Pumps with circumferential or transverse flow
- F04D5/002—Regenerative pumps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/38—Brush holders
- H01R39/40—Brush holders enabling brush movement within holder during current collection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/10—Arrangements of brushes or commutators specially adapted for improving commutation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/14—Means for supporting or protecting brushes or brush holders
- H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
- H02K5/148—Slidably supported brushes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
Definitions
- the present invention relates to an electric pump device driven by an electric motor, and more particularly to a brush holding structure of an electric pump device suitable for a fuel supply device for supplying high viscosity fuel containing ethanol or the like to an engine or the like.
- Patent Document 1 describes a motor-type fuel pump in which an electric motor is incorporated and the motor and the pump device are integrated.
- a disc type commutator is used as a motor rectifying device.
- the carbon brush is in sliding contact with the disk-shaped commutator from the axial direction.
- FIG. 10 is an explanatory view showing the behavior of the brush in the case of the high viscosity fuel.
- the brush 51 is accommodated in the brush holder 52 so as to be movable in the vertical direction in the drawing.
- the brush 51 is pressed against the commutator 53 by the biasing force of the brush spring 54.
- a pressing force Fc along the circumferential direction acts on the brush 51 of FIG.
- a moment force F1 acts on the brush 51 by the reaction force Fc '.
- a moment Mf having a contact point of the brush 51 and the commutator 53 as a center O acts on the brush 51 by the moment force F1.
- the load Fs by the brush spring 54 also acts on the brush 51.
- the brush 51 is pressed against the sliding surface of the commutator 53 by the load Fs.
- a moment force F2 acts on the upper end Q (spring contact portion) of the brush 51 by the load Fs.
- a moment Ms (arm length: Ls) centering on O acts on the brush 51 by the moment force F2.
- the moment Ms is a moment reverse to the previous moment Mf.
- the commutator 53 has a slit 55 between each segment, and the contact resistance pulsates also when the brush 51 passes through the slit.
- An object of the present invention is to provide an electric pump device in which a brush and a commutator are hardly worn even when used for a fuel having a high viscosity such as ethanol.
- the electric pump device comprises an electric motor with a brush, and is provided with a disc type commutator with which the brush contacts in the axial direction, and a brush accommodating portion for holding the brush movably along the axial direction. It is an electric pump device which has a motor part which has a brush holder, and a pump part rotationally driven by the motor part, and the electric motor operation of the electric motor is carried out near the end by the side of the commutator of the brush accommodation part. Sometimes, a brush contact portion is provided which contacts the rear side in the rotational direction of the brush.
- the brush contact portion is formed at or near the end on the commutator side of the brush storage portion, so that the fulcrum of the brush is set near the commutator. Therefore, the moment Mf acting on the brush 51 by the brush pressing force Fc and centered on the contact point of the brush and the commutator becomes small. For this reason, even in the case of high viscosity fuel, the brush does not easily tilt.
- the inner wall on the rear side in the rotational direction of the brush accommodating portion is tapered so that the inner dimension in the circumferential direction of the brush accommodating portion expands in the axial direction from the end on the commutator side.
- an end opening edge on the commutator side of the brush housing portion may be used as the brush contact portion.
- a contact protrusion may be provided on the rear side in the rotational direction of the end portion of the brush housing portion so as to protrude in the circumferential direction.
- a contact portion protruding in the circumferential direction may be provided on the inner wall on the rear side in the rotational direction of the brush housing portion.
- another electric pump device comprises a motor with a brush, a disc type commutator with which the brush contacts in the axial direction, and a brush accommodating portion which holds the brush movably along the axial direction.
- An electric pump device having a motor portion having a brush holder formed thereon and a pump portion rotationally driven by the motor portion, the electric motor being operated near the end portion on the commutator side of the brush at the time of operation of the electric motor
- a brush contact portion is provided in contact with the inner wall on the rear side in the rotational direction of the brush housing portion.
- the brush contact portion is formed in the vicinity of the end on the commutator side of the brush when the electric motor is operated, so that the fulcrum of the brush is set near the commutator. Therefore, the moment Mf acting on the brush 51 by the brush pressing force Fc and centered on the contact point of the brush and the commutator becomes small. For this reason, even in the case of high viscosity fuel, the brush does not easily tilt.
- the rotational direction rear end face of the brush is formed in a tapered shape so that the circumferential dimension of the brush decreases along the axial direction from the end on the commutator side, and the commutator of the brush
- the vicinity of the end on the side may be used as the brush contact portion.
- an enlarged portion extending in the circumferential direction may be provided on the rotational direction rear side in the vicinity of the end portion of the brush.
- a contact portion protruding in the circumferential direction may be provided on the rear end surface in the rotational direction of the brush.
- the distance Hp between the contact point between the brush holder and the brush and the contact surface between the brush and the commutator is W
- the width in the circumferential direction of the brush is W
- the slide between the brush and the commutator Assuming that the dynamic friction coefficient is ⁇ , the relationship of (W / 2Hp) ⁇ ⁇ may be established. Thereby, the contact between the brush and the commutator is stably maintained.
- a groove extending in the circumferential direction may be formed on the contact surface of the brush with the commutator.
- an electric pump having a motor unit having a disk type commutator, a brush holder having a brush holding unit for holding a brush formed therein, and a pump unit rotationally driven by the motor unit
- a brush contact portion is provided near the end on the commutator side of the brush housing and on the rear side in the rotational direction of the brush when the electric motor is activated, so the fulcrum of the brush is set near the commutator
- the moment Mf acting on the brush 51 by the brush pressing force Fc with the contact point of the brush and the commutator as the center O becomes small.
- the brush does not easily tilt, and it is possible to suppress the increase in contact resistance between the brush and the commutator due to the decrease in the contact area.
- an electric pump device of the present invention has a motor unit having a disc type commutator, a brush holder in which a brush accommodating unit for holding a brush is formed, and a pump unit rotationally driven by the motor unit.
- a brush contact portion that abuts against the inner wall on the rear side in the rotational direction of the brush housing when the electric motor is activated is provided near the end of the brush on the commutator side.
- the brush does not easily tilt, and it is possible to suppress the increase in the contact resistance between the brush and the commutator due to the decrease in the contact area.
- FIG. 10 is an explanatory view showing a modification of the brush contact portion in the electric pump device of the first embodiment. It is explanatory drawing which shows the behavior of the brush at the time of using the conventional electric pump apparatus for high viscosity fuel.
- Electric pump device Electric motor (motor section) DESCRIPTION OF SYMBOLS 3 fuel pump (pump part) 4 shell case 5 outlet cover 6 inlet cover 7 brush holder 8 pump case 9 brush accommodating part 10 carbon brush 10a circumferential direction end surface 10b sliding surface (contact surface) 11 brush spring 12 commutator 13 check valve 14 fuel discharge port 15 permanent magnet 16 armature 17 slot 18 core 19 rotary shaft 20 bearing portion 21 bearing 22 impeller 23 impeller housing portion 24 pump chamber 25 fuel suction port 26 inner wall 27 opening 28 opening edge Brush contact part) 29 serration groove 31 brush 31 a end surface 32 circumferential end surface 33 contact protrusion (brush contact portion) 34 brush 35 enlarged portion (brush contact portion) 36 Abutment part (brush contact part) 37 brush 38 circumferential end face 39 butting portion (brush contacting portion) 41 brush 51 brush 52 brush holder 53 commutator 54 brush spring 55 slit
- FIG. 1 is a cross-sectional view showing the configuration of an electric pump device according to a first embodiment of the present invention.
- the electric pump device 1 of FIG. 1 is applied to, for example, a fuel supply device for a motorcycle, and is used to supply fuel to a fuel injection valve of an engine.
- the electric pump device 1 has a configuration in which an electric motor 2 (motor unit, hereinafter abbreviated as motor 2) and a fuel pump (pump unit) 3 are integrally housed in a steel shell case 4.
- motor 2 motor unit, hereinafter abbreviated as motor 2
- pump unit 3 fuel pump
- an outlet cover 5 made of synthetic resin and an inlet cover 6 made of aluminum die cast are attached.
- the outlet cover 5 and the inlet cover 6 are fixed to the end of the shell case 4 by caulking.
- the outlet cover 5 is attached to one end of the shell case 4.
- a brush holder 7 made of synthetic resin is disposed inside the outlet cover 5.
- the inlet cover 6 is attached to the other end of the shell case 4.
- a pump case 8 is disposed inside the inlet cover 6.
- the brush holder 7 is provided with a brush accommodating portion 9.
- a carbon brush 10 (hereinafter referred to as a brush 10) of the motor 2 is housed and held in the brush housing portion 9.
- the brush 10 is pressed against the commutator 12 of the motor 2 by the brush spring 11.
- the motor 2 is a DC motor with a brush, and a so-called flat type (flat type) commutator 12 is used.
- the brush 10 is in contact with the commutator 12 in the axial direction (vertical direction in FIG. 1) by the biasing force of the brush spring 11.
- the fuel discharge port 14 is formed in the outlet cover 5.
- the fuel discharge port 14 is provided with a check valve 13 for preventing backflow of fuel.
- the shell case 4 doubles as a yoke of the motor 2.
- a plurality of permanent magnets 15 are fixed to the inner peripheral surface of the shell case 4.
- An armature 16 is rotatably disposed inside the permanent magnet 15.
- the armature 16 has a core 18 formed by laminating steel core plates.
- the core 18 is formed with a plurality of axially extending slots 17.
- a motor coil is wound in the slot 17 of the core 18.
- the armature 16 is fixed to the rotating shaft 19.
- the rotating shaft 19 is rotatably supported by a bearing 20 provided on the brush holder 7 and a bearing 21 attached to the pump case 8.
- the fuel pump 3 is a non-volume regenerative type pump and is formed of a pump case 8 and an impeller 22.
- an impeller accommodating portion 23 having a cylindrical hole shape is formed.
- an impeller 22 is disposed in the impeller housing portion 23, an impeller 22 is disposed.
- the impeller 22 is connected to the rotation shaft 19 of the motor 2.
- the rotary shaft 19 is formed with a D-cut portion, and the impeller 22 is attached to the D-cut portion. Thereby, the impeller 22 rotates integrally with the rotating shaft 19.
- a large number of pump chambers 24 are provided along the circumferential direction near the outer periphery of the impeller 22.
- the pump chamber 24 is formed to penetrate the impeller 22 in the axial direction.
- a fuel suction port 25 is provided in the inlet cover 6 corresponding to the pump chamber 24.
- the pump case 8 is provided with a communication hole (not shown) for communicating the impeller housing portion 23 with the inside of the shell case 4.
- One end of the communication hole opens in the upper end surface of the impeller accommodating portion 23 and the other end opens in the shell case 4.
- Fuel is delivered into the shell case 4 as the impeller 22 rotates by this communication hole.
- the fuel delivered into the shell case 4 flows in the shell case 4 and is discharged from the fuel discharge port 14.
- the electric pump device 1 having such a configuration functions as follows. First, when the motor 2 is driven and the fuel pump 3 is operated, the fuel in the fuel tank is sucked from the fuel suction port 25. At this time, in the fuel pump 3, the impeller 22 rotates with the rotation shaft 19. As the impeller 22 rotates, fuel is drawn into the pump chamber 24 from the fuel suction port 25. The fuel in the pump chamber 24 is delivered into the shell case 4 by the rotation of the impeller 22. The fuel fed into the shell case 4 flows through the inside of the shell case 4 and is discharged from the fuel discharge port 14. As a result, fuel is supplied from the electric pump device 1 to the fuel flow path (not shown).
- FIG. 2 is an explanatory view showing a brush holding structure in the electric pump device 1.
- the inner walls 26 on both end sides in the circumferential direction of the brush housing portion 9 are formed in a tapered shape (a taper angle of 0.5 ° or more).
- the taper angle is emphasized and described.
- the dimension (inner circumferential dimension of the brush accommodating portion) X between the opposing inner walls 26 is enlarged along the axial direction from the opening 27 on the commutator 12 side. That is, in the brush accommodating portion 9, the portion of the opening 27 has the smallest dimension. Then, as the distance from the commutator 12 (upward in the figure) increases, the inner size (dimension X) of the brush housing 9 increases.
- a slight clearance is provided between the brush 10 and the brush holder 7 so that the brush 10 can move in the axial direction (vertical direction in the figure). It is done.
- the load Fs from the brush spring 11 acts on the brush 10.
- the brush 10 is pressed against the sliding surface of the commutator 12 by the load Fs.
- a moment force F2 acts on the upper end Q of the brush 10 by the load Fs.
- a moment Ms (arm length: Ls) centering on O acts on the brush 10 by the moment force F2.
- the moment Ms is a moment opposite to the moment Mf. As described above, when the moments Ms and Mf satisfy Ms ⁇ Mf, the brush 10 is held pressed against the commutator 12.
- the contact point P (the opening edge 28 of the brush holder 7) of the brush holder 7 and the brush 10 and the contact surface between the brush sliding surface (the brush 10 and the commutator 12).
- Distance Hp (the amount of popping out of the brush) is smaller than that in FIG. That is, the distance Lc between the center O of the moment Mf due to the brush pressing force Fc and the brush fulcrum P is smaller than that in the configuration of FIG. For this reason, the moment Mf generated on the brush is smaller than in the case of FIG.
- the pressing force Fc increases and, accordingly, the Mf also increases.
- the distance Hp is defined as W (the width in the lateral direction in FIG. 2 of the brush 10) in the circumferential direction of the brush 10 and ⁇ as the sliding friction coefficient between the brush 10 and the commutator 12. Then, the relationship of (W / 2Hp) ⁇ ⁇ is established.
- Mf and Ms have the following relationship.
- Mf F1 ⁇ Lc (1)
- Ms F2 ⁇ Ls (2)
- F1 / Fc Hp / Lc (3)
- F2 / Fs (W / 2) / Ls (4)
- the brush housing portion 9 is formed so that the brush 10 abuts on the rotational direction rear side of the opening edge 28 of the brush holder 7 during motor operation. Even if the viscosity and flow velocity of the fuel increase, the brush 10 becomes difficult to tilt. Further, by setting Hp, that is, the position where the brush 10 abuts against the opening edge 28 such that (W / 2Hp)) ⁇ is satisfied, it becomes possible to satisfactorily satisfy Ms ⁇ Mf, and the inclination of the brush 10 Can be reduced. In order to make Ms ⁇ Mf easier to be established, not only the reduction on the right side but also the increase on the left side may be attempted. That is, the load Fs by the brush spring 11 may be increased to increase Ms, and a setting in which Mf does not easily exceed Ms may be adopted.
- the behavior of the brush 10 is stabilized as compared with the conventional device, so that the increase in the contact resistance between the brush and the commutator due to the reduction of the contact area can be suppressed.
- the wear of the brush and the commutator can be suppressed, and even if the motor-driven pump device 1 is used for fuel with high viscosity such as ethanol, the wear of the brush and the commutator can be reduced. Therefore, it becomes possible to select the fuel in consideration of the global environment and to expand the application of the electric pump.
- the brush 10 is inclined not only during the operation of the motor but also in the stationary state, and the phenomenon that the front side in the rotational direction is lifted is observed.
- the cause of such floating is, first of all, that the brush 10 and the brush holder 7 collide with each other due to the accumulation of dimensional tolerances and geometrical tolerances, and the brush sliding surface does not contact the commutator 12.
- the brush 10 may have a portion not in contact with the commutator 12 due to the waviness of the sliding surface of the brush. That is, in a state before the brush 10 and the commutator 12 become familiar, the brush 10 and the commutator 12 may partially abut, which may cause the brush 10 to be lifted.
- the serration groove 29 is formed along the circumferential direction of the commutator 12, as indicated by a broken line in FIG.
- a plurality of serration grooves 29 are formed on the sliding surface 10b at predetermined intervals, and provided over the entire radial direction of the sliding surface 10b (the direction perpendicular to the paper surface in FIG. 2).
- FIG. 3 is an explanatory view showing the brush holding structure.
- the parts other than the brush holding structure of the electric pump device of the following embodiment are the same as those of the electric pump device 1 of the first embodiment, and the same members and parts as in the first embodiment are denoted by the same reference numerals. The explanation is omitted.
- the circumferential end surface 32 of the brush 31 has a tapered shape, contrary to the first embodiment.
- the end face (sliding surface) 31a on the side of the commutator 12 has the maximum width.
- the taper angle of the brush 31 is formed to be 0.5 ° or more.
- the tip of the brush holder 7 (the closest portion to the commutator 12) is the contact point P with the brush 31.
- the distance Lc between the center O of the moment Mf and the brush fulcrum P becomes smaller as compared with the configuration of FIG. 10, and the moment Mf can be suppressed small. Therefore, Ms ⁇ Mf is maintained even at higher viscosity and flow velocity, and the brush 31 becomes difficult to tilt, and it becomes possible to suppress the occurrence of arc between the brush and the commutator due to sudden change of the contact resistance.
- the wear of the brush and the commutator can be suppressed, and even if the electric pump device is used for fuel with high viscosity such as ethanol, the wear of the brush and the commutator can be reduced.
- FIG. 4 is an explanatory view showing a brush holding structure of an electric pump device which is Embodiment 3 of the present invention.
- the end of the brush housing portion 9 has a step shape.
- a contact protrusion (brush contact portion) 33 is formed to project from the open end of the brush housing portion 9.
- the contact protrusion 33 is formed on the end of the inner wall 26 at both ends in the circumferential direction of the brush housing 9 and protrudes from the inner wall 26 in the circumferential direction.
- the portion of the contact protrusion 33 of the brush housing portion 9 has a minimum width.
- a portion on the back side of the contact protrusion 33 of the brush housing portion 9 has a dimension larger than the width of the brush 10.
- FIG. 5 is an explanatory view showing a brush holding structure of an electric pump device which is Embodiment 4 of the present invention.
- the brush 34 has a step shape, contrary to the third embodiment.
- an enlarged portion (brush abutting portion) 35 is formed stepwise in an end portion on the commutator 12 side.
- the enlarged portions 35 are formed on both ends in the circumferential direction of the brush 34, and are formed so as to protrude in the circumferential direction.
- the portion of the enlarged portion 35 of the brush 34 has the maximum width.
- the width of the enlarged portion 35 is formed slightly smaller than the inner size of the brush accommodating portion 9.
- the portion on the back side of the enlarged portion 35 of the brush 34 has a size smaller than that of the enlarged portion 35.
- FIG. 6 is an explanatory view showing a brush holding structure of an electric pump device according to a fifth embodiment of the present invention.
- a butting portion (brush abutting portion) 36 is provided on the inner wall 26 on both ends in the circumferential direction of the brush accommodating portion 9.
- the abutment portion 36 is formed in the vicinity of the opening 27 of the inner wall 26 and protrudes from the inner wall 26 in the circumferential direction.
- the portion of the abutting portion 36 of the brush accommodating portion 9 has a minimum width.
- the front and back of the butting portion 36 of the brush housing portion 9 are enlarged in a tapered manner.
- FIG. 7 is an explanatory view showing a brush holding structure of an electric pump device which is Embodiment 6 of the present invention.
- the circumferential end face 38 of the brush 37 is provided with a butting portion (brush abutting portion) 39.
- the abutment portions 39 are formed on both end sides of the brush 37 in the circumferential direction, and are formed to protrude in the circumferential direction.
- the portion of the abutting portion 39 has the maximum width.
- the width of the butting portion 39 is formed to be slightly smaller than the inner dimension of the brush housing portion 9.
- the front and back of the abutting portion 39 of the brush 34 are reduced in a tapered manner.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
- the configurations of the respective embodiments are not only used alone as described above, but it is also possible to use them in combination as appropriate.
- various combinations such as a configuration in which the first embodiment and the fourth embodiment are combined, can be assumed.
- the tapered inner wall 26 and the circumferential end surface 32, the contact projection 33, the enlarged portion 35, and the abutment portions 36 and 39 are provided at the front and rear of the rotation direction. When the rotation direction of 2 is constant, they may be provided only on the rear side in the rotation direction.
- the present invention to a motor having a structure in which the brush 41 is disposed in an inclined manner and pressed against the commutator 12 from an oblique direction.
- the shape of the opening edge 28 forming the brush contact portion is not only the acute-angled edge configuration as shown in FIG. 2 but also the stepped burr relief shape as shown in FIG. It is also possible to make it a curved surface (R) shape such as (b).
- the electric pump apparatus by this invention for the fuel supply apparatus for motorcycles was shown in above-mentioned embodiment, the application is not limited to this, Various vehicles, such as four-wheeled vehicles, etc. It can also be used as a fuel supply device for The configuration of the present invention is applicable not only to a fuel pump, but also to a pump such as a liquid such as water or a chemical, or a gas such as air.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Current Collectors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
3 燃料ポンプ(ポンプ部) 4 シェルケース
5 アウトレットカバー 6 インレットカバー
7 ブラシホルダ 8 ポンプケース
9 ブラシ収容部 10 カーボンブラシ
10a 周方向端面 10b 摺動面(接触面)
11 ブラシスプリング 12 コンミテータ
13 チェックバルブ 14 燃料吐出口
15 永久磁石 16 アーマチュア
17 スロット 18 コア
19 回転軸 20 軸受部
21 軸受 22 インペラ
23 インペラ収容部 24 ポンプ室
25 燃料吸入口 26 内壁
27 開口 28 開口縁(ブラシ当接部)
29 セレーション溝 31 ブラシ
31a 端面 32 周方向端面
33 当接突起(ブラシ当接部) 34 ブラシ
35 拡大部(ブラシ当接部)
36 突き当て部(ブラシ当接部)
37 ブラシ 38 周方向端面
39 突き当て部(ブラシ当接部) 41 ブラシ
51 ブラシ 52 ブラシホルダ
53 コンミテータ 54 ブラシスプリング
55 スリット
Mf=F1×Lc (1)
Ms=F2×Ls (2)
また、F1,Fc、F2,FSの間には、それぞれ次の関係がある。
F1/Fc=Hp/Lc (3)
F2/Fs=(W/2)/Ls (4)
F2×Ls≧F1×Lc (5)
となる。(3)をF1について解いて(5)式右辺に代入すると、
F2×Ls≧{(Fc・Hp)/Lc}×Lc=Fc・Hp となる。
[{(W/2)×Fs}/Ls]×Ls≧Fc・Hp
(W/2)×Fs≧Fc・Hp
Fs×(W/2Hp)≧Fc (6)
Fs×(W/2Hp)≧μ×Fs となる。これから、Ms≧Mfが成立する条件として、
(W/2Hp)≧μ が求められる。そして、このような関係にHpを設定することにより、Ms≧Mfの条件をさらに良好に維持することが可能となる。
例えば、各実施例の構成は、前述のように各々単独に使用されるのみならず、それらを適宜組み合わせて使用することも可能である。例えば、実施例1と実施例4を組み合わせた構成など、種々の組み合わせが想定可能である。また、前述の実施例では、テーパ状の内壁26及び周方向端面32や、当接突起33、拡大部35、突き当て部36,39を回転方向の前後に設けた構成を示したが、モータ2の回転方向が一定の場合には、それらを回転方向後方側のみに設けても良い。
Claims (10)
- ブラシ付の電動モータからなり、軸方向から前記ブラシが接触するディスクタイプのコンミテータと、前記ブラシを軸方向に沿って移動可能に保持するブラシ収容部が形成されたブラシホルダとを有するモータ部と、前記モータ部によって回転駆動されるポンプ部とを有する電動ポンプ装置であって、
前記ブラシ収容部の前記コンミテータ側の端部又は端部近傍に、前記電動モータ作動時に、前記ブラシの回転方向後方側と当接するブラシ当接部を設けたことを特徴とする電動ポンプ装置。 - 請求項1記載の電動ポンプ装置において、前記ブラシ収容部の周方向の内寸が前記コンミテータ側の端部から軸方向に沿って拡大するように、前記ブラシ収容部の回転方向後方側の内壁をテーパ状に形成し、前記ブラシ収容部の前記コンミテータ側の端部開口縁を前記ブラシ当接部としたことを特徴とする電動ポンプ装置。
- 請求項1記載の電動ポンプ装置において、前記ブラシ当接部として、前記ブラシ収容部の端部の回転方向後方側に、周方向に向かって突出する当接突起を設けたことを特徴とする電動ポンプ装置。
- 請求項1記載の電動ポンプ装置において、前記ブラシ当接部として、前記ブラシ収容部の回転方向後方側の内壁に、周方向に向かって突出する突き当て部を設けたことを特徴とする電動ポンプ装置。
- ブラシ付の電動モータからなり、軸方向から前記ブラシが接触するディスクタイプのコンミテータと、前記ブラシを軸方向に沿って移動可能に保持するブラシ収容部が形成されたブラシホルダとを有するモータ部と、前記モータ部によって回転駆動されるポンプ部とを有する電動ポンプ装置であって、
前記ブラシの前記コンミテータ側の端部近傍に、前記電動モータ作動時に、前記ブラシ収容部の回転方向後方側の内壁と当接するブラシ当接部を設けたことを特徴とする電動ポンプ装置。 - 請求項5記載の電動ポンプ装置において、前記ブラシの周方向寸法が前記コンミテータ側の端部から軸方向に沿って縮小するように、前記ブラシの回転方向後方側端面をテーパ状に形成し、前記ブラシの前記コンミテータ側の端部近傍を前記ブラシ当接部としたことを特徴とする電動ポンプ装置。
- 請求項5記載の電動ポンプ装置において、前記ブラシ当接部として、前記ブラシの端部近傍の回転方向後方側に、周方向に向かって延びる拡大部を設けたことを特徴とする電動ポンプ装置。
- 請求項5記載の電動ポンプ装置において、前記ブラシ当接部として、前記ブラシの回転方向後方側端面に、周方向に向かって突出する突き当て部を設けたことを特徴とする電動ポンプ装置。
- 請求項1~8の何れか1項に記載の電動ポンプ装置において、前記ブラシホルダと前記ブラシとの接触点と、前記ブラシと前記コンミテータとの接触面との距離Hpが、ブラシの周方向の幅をW、ブラシとコンミテータとの摺動摩擦係数をμとすると、(W/2Hp)≧μの関係が成り立つように設定されていることを特徴とする電動ポンプ装置。
- 請求項1又は5記載の電動ポンプ装置において、前記ブラシの前記コンミテータとの接触面に、周方向に沿って延びる溝を形成したことを特徴とする電動ポンプ装置。
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JP2011151919A (ja) * | 2010-01-20 | 2011-08-04 | Jtekt Corp | 給電ブラシ、直流モータ及び電動パワーステアリング装置 |
JP2011234437A (ja) * | 2010-04-23 | 2011-11-17 | Asmo Co Ltd | ブラシホルダ装置、モータ及びワイパモータ |
JP2013038889A (ja) * | 2011-08-08 | 2013-02-21 | Mitsuba Corp | 直流モータおよび減速機付き直流モータ |
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KR101758632B1 (ko) | 2015-10-23 | 2017-07-17 | 주식회사 코아비스 | 브러쉬의 흔들림을 방지하기 위한 브러쉬 홀더 |
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JPH04200256A (ja) * | 1990-11-02 | 1992-07-21 | Asmo Co Ltd | ブラシ保持装置 |
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JPH11234949A (ja) * | 1998-02-13 | 1999-08-27 | Matsushita Electric Ind Co Ltd | 整流子電動機及びそれを用いた電気掃除機 |
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JPS63272994A (ja) * | 1987-04-30 | 1988-11-10 | Nippon Denso Co Ltd | モ−タ式燃料ポンプ |
JPH04200256A (ja) * | 1990-11-02 | 1992-07-21 | Asmo Co Ltd | ブラシ保持装置 |
JPH0982440A (ja) * | 1995-09-12 | 1997-03-28 | Exedy Corp | スリップリング |
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JP2011151919A (ja) * | 2010-01-20 | 2011-08-04 | Jtekt Corp | 給電ブラシ、直流モータ及び電動パワーステアリング装置 |
JP2011234437A (ja) * | 2010-04-23 | 2011-11-17 | Asmo Co Ltd | ブラシホルダ装置、モータ及びワイパモータ |
JP2013038889A (ja) * | 2011-08-08 | 2013-02-21 | Mitsuba Corp | 直流モータおよび減速機付き直流モータ |
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BRPI0912792A8 (pt) | 2018-10-09 |
BRPI0912792B1 (pt) | 2019-09-10 |
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