JPH1113643A - Gear pump - Google Patents

Gear pump

Info

Publication number
JPH1113643A
JPH1113643A JP16622697A JP16622697A JPH1113643A JP H1113643 A JPH1113643 A JP H1113643A JP 16622697 A JP16622697 A JP 16622697A JP 16622697 A JP16622697 A JP 16622697A JP H1113643 A JPH1113643 A JP H1113643A
Authority
JP
Japan
Prior art keywords
gear
noise
teeth
motor
commutators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16622697A
Other languages
Japanese (ja)
Other versions
JP3599960B2 (en
Inventor
Yasushi Shidahara
靖 志田原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP16622697A priority Critical patent/JP3599960B2/en
Publication of JPH1113643A publication Critical patent/JPH1113643A/en
Application granted granted Critical
Publication of JP3599960B2 publication Critical patent/JP3599960B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Rotary Pumps (AREA)
  • Motor Or Generator Current Collectors (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of composite noises of gear noises and motor noises, in a gear pump driven by a commutator motor. SOLUTION: In this gear pump 1, a drive gear 14 and a driven gear 15, engaged with each other, are arranged in the gear chamber 13 of a housing 10. The drive gear 14 is driven by a motor 2, having the number Nc=20 of commutators, through a drive shaft 11 and a shaft coupling 3. A value of a minimum common multiple between the number Nt of teeth and the number Nc of commutators is set to a value higher than a given value R=200 as the number Nt=13 of teeth of the drive gear 14. A resonance frequency Fr of gear noises and motor noises forms a frequency area at which the auditory sense of a human being is dull, and the generation of the noises sensed by a physical feeling is reduced. Further, by making the number Nt of teeth and the number Nc of commutators mutually prime, the increase of the size of the gear pump is prevented from occurring.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、互いに噛み合う一
対のギアの回転によりポンプ作用をなすギアポンプに関
する。特に、一方のギアが、整流子付き電動モータによ
って駆動されるものに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear pump which operates by rotating a pair of gears meshing with each other. In particular, the present invention relates to one in which one of the gears is driven by an electric motor with a commutator.

【0002】[0002]

【従来の技術および発明が解決しようとする課題】ギア
ポンプは、簡単な構造を有する小型軽量のポンプとして
種々の産業分野に用いられている。例えば、近年、上述
のギアポンプを電動モータで駆動する電動ポンプユニッ
トとして構成し、このユニットで発生した油圧によっ
て、自動車の舵輪(ステアリングホイール)の操作力を
軽減する電動ポンプ式パワーステアリング装置が考えら
れている。
2. Description of the Related Art Gear pumps are used in various industrial fields as small and lightweight pumps having a simple structure. For example, in recent years, an electric pump type power steering device in which the above-described gear pump is configured as an electric pump unit driven by an electric motor and the operating force of a steering wheel (steering wheel) of an automobile is reduced by hydraulic pressure generated by this unit has been considered. ing.

【0003】このような電動ポンプ式パワーステアリン
グ装置では、上述の電動ポンプユニットの電動モータ
に、整流子付きモータが適用されている。整流子付きモ
ータには、外部回路から回転する電機子に通電するため
に、回転する整流子に接触する黒鉛電極等のブラシが、
固定部材として備えられている。このため、このユニッ
トで生ずる騒音には、モータのブラシに起因した騒音
(モータ騒音)と、ギアポンプのギアに起因した騒音
(ギア騒音)とが含まれており、これらの騒音が合わさ
った複合騒音が発生していた。
In such an electric pump type power steering apparatus, a motor with a commutator is applied to the electric motor of the above electric pump unit. In the motor with a commutator, a brush such as a graphite electrode that contacts the rotating commutator in order to energize the rotating armature from an external circuit,
It is provided as a fixing member. Therefore, the noise generated by this unit includes noise caused by the brush of the motor (motor noise) and noise caused by the gear of the gear pump (gear noise). Had occurred.

【0004】一方、電動ポンプ式パワーステアリング装
置の電動ポンプユニットは静粛性を要望されている。ま
た、電動ポンプ式パワーステアリング装置に限らず、電
動ポンプユニットを用いた一般の装置においても、電動
ポンプユニットの静粛性が要望されている。そこで、本
発明の目的は、上述の技術的課題を解決し、共振に起因
した複合騒音の発生を抑制できるギアポンプを提供する
ことである。
On the other hand, the electric pump unit of the electric pump type power steering device is required to be quiet. Further, not only the electric pump type power steering device but also a general device using the electric pump unit is required to have a quiet electric pump unit. Therefore, an object of the present invention is to solve the above-mentioned technical problems and to provide a gear pump that can suppress generation of complex noise caused by resonance.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するた
め、本願発明者は以下の点に着目した。すなわち、モー
タ騒音は整流子数に比例する複数の周波数で騒音ピーク
を有しており、また、ポンプ騒音はギア歯数に比例する
複数の周波数で騒音ピークを有している。従来、これら
ギア歯数と整流子数との関係は一切考慮されていなかっ
たので、上述のモータ騒音とポンプ騒音との両騒音ピー
クがほぼ一致する周波数(共振周波数)が比較的に低い
周波数帯域に現れ、その結果、両騒音が互いに共鳴して
不快な大きさの音を発生しているのではないかとの知見
を得るに至った。
Means for Solving the Problems In order to achieve the above object, the present inventor paid attention to the following points. That is, the motor noise has noise peaks at a plurality of frequencies proportional to the number of commutators, and the pump noise has noise peaks at a plurality of frequencies proportional to the number of gear teeth. Conventionally, the relationship between the number of gear teeth and the number of commutators has not been taken into consideration at all, so that the frequency (resonance frequency) at which the above-mentioned noise peaks of the motor noise and the pump noise almost coincide with each other is relatively low. As a result, they came to the knowledge that both noises resonated with each other to generate unpleasant loud sounds.

【0006】これらの事柄に鑑みて、本願発明者は以下
の本発明を完成したものである。請求項1にかかる発明
のギアポンプは、整流子付き駆動用モータで駆動される
ギアを有するギアポンプにおいて、上記ギアの歯数およ
び整流子数の最小公倍数を騒音低減に寄与できる所定値
以上としたことを特徴とする。ここで、騒音低減に寄与
できる所定値以上とは、ギア騒音とモータ騒音との共振
周波数が、人間にとって聴感が鈍くなる周波数、例えば
10kHz以上を実現できるような、歯数および整流子
数の最小公倍数の値であり、具体的には、17kHz以
上(ポンプの回転速度4000RPM、ギアの歯数が1
3、整流子数が20の場合)である。
In view of these matters, the present inventor has completed the present invention described below. In the gear pump according to the first aspect of the present invention, in a gear pump having a gear driven by a drive motor with a commutator, the number of teeth of the gear and the least common multiple of the number of commutators are set to predetermined values or more that can contribute to noise reduction. It is characterized by. Here, the predetermined value or more that can contribute to the noise reduction means that the resonance frequency of the gear noise and the motor noise is a minimum frequency of the number of teeth and the number of commutators that can realize a frequency at which human hearing becomes dull, for example, 10 kHz or more. The value is a common multiple, specifically, 17 kHz or more (the rotational speed of the pump is 4000 RPM, and the number of gear teeth is 1).
3, when the number of commutators is 20).

【0007】この構成によれば、ギア歯数および整流子
数の最小公倍数を設定すると、ギア騒音とモータ騒音と
の共振周波数を決めることができる。この共振周波数
を、聴感が鈍くなる周波数以上としたので、体感上の騒
音を低減することができる。請求項2にかかる発明のギ
アポンプは、請求項1に記載のギアポンプにおいて、上
記歯数と整流子数とは、互いに素であることを特徴とす
る。
According to this configuration, the resonance frequency of the gear noise and the motor noise can be determined by setting the least common multiple of the number of gear teeth and the number of commutators. Since the resonance frequency is equal to or higher than the frequency at which the sense of hearing becomes dull, it is possible to reduce bodily noise. A gear pump according to a second aspect of the present invention is the gear pump according to the first aspect, wherein the number of teeth and the number of commutators are relatively prime.

【0008】この構成によれば、請求項1にかかる発明
の作用に加えて、歯数や整流子数を極端に多くすること
なく、両者の最小公倍数を上述の所定値以上にすること
ができる。ここで、歯数と整流子数との組合せとして
は、(13,20)、(11,20)、(17,20)
等の組合せを例示することができる。
According to this configuration, in addition to the effect of the invention according to claim 1, the least common multiple of the two can be equal to or greater than the predetermined value without extremely increasing the number of teeth and the number of commutators. . Here, combinations of the number of teeth and the number of commutators are (13, 20), (11, 20), (17, 20).
And the like.

【0009】[0009]

【発明の実施の形態】以下、本発明の一実施形態を、添
付図面を参照しつつ説明する。図1は、本発明の一実施
の形態にかかるギアポンプを含む電動ポンプユニットの
概略構成を示す正面図である。図2は、図1のギアポン
プの断面側面図であり、ハッチングを省略してある。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing a schematic configuration of an electric pump unit including a gear pump according to one embodiment of the present invention. FIG. 2 is a cross-sectional side view of the gear pump of FIG. 1, with hatching omitted.

【0010】電動ポンプユニットAは、ギアポンプ1
と、ギアポンプ1を駆動するモータ2と、モータ2の回
転軸21とギアポンプ1の駆動軸11とを接続する軸継
手3とを有している。モータ2は、ギアポンプ1のハウ
ジング12に取付部材(図示せず)を介して固定されて
いる。モータ2は、直流モータである。モータ2は、回
転トルクを取り出すための回転軸21を含み回転トルク
を発生するための回転子22と、回転子22に外部回路
から電流を供給するための複数のブラシ23とを備えて
いる。
The electric pump unit A includes a gear pump 1
And a motor 2 for driving the gear pump 1, and a shaft coupling 3 for connecting the rotating shaft 21 of the motor 2 and the driving shaft 11 of the gear pump 1. The motor 2 is fixed to a housing 12 of the gear pump 1 via a mounting member (not shown). The motor 2 is a DC motor. The motor 2 includes a rotor 22 that includes a rotating shaft 21 for extracting the rotating torque and generates a rotating torque, and a plurality of brushes 23 for supplying a current to the rotor 22 from an external circuit.

【0011】ブラシ23は、回転子22の外周面に等配
に配置された複数、例えば、20個(整流子数Nc)の
整流子と接触している。回転子22が回転すると、ブラ
シ23は各整流子に順次接触しながら 、整流子を介し
て回転子22の電機子巻線に給電する。各整流子は、回
転子22の外周面に配置された部分で、ブラシ23の端
面と接触している。ブラシ23は炭素電極からなり、回
転子22の外周面に沿って配置された整流子の周囲に、
等配に配置されている。
The brushes 23 are in contact with a plurality of, for example, 20 commutators (the number Nc of commutators) arranged evenly on the outer peripheral surface of the rotor 22. When the rotor 22 rotates, the brush 23 supplies power to the armature winding of the rotor 22 via the commutator while sequentially contacting each commutator. Each commutator is in contact with the end face of the brush 23 at a portion arranged on the outer peripheral surface of the rotor 22. The brush 23 is made of a carbon electrode, and around a commutator arranged along the outer peripheral surface of the rotor 22,
They are arranged evenly.

【0012】回転軸21は、モータ2の一端より突出し
て設けられている。回転軸21の端部には、軸継手3が
取り付けられており、軸継手3はギアポンプ1の駆動軸
11に駆動連結されている。ギアポンプ1は、中央部を
貫通する長円形断面の空洞を有する本体筒10aと、本
体筒10aの両側全面を覆う一対の蓋板10bと、本体
筒10aの空洞の両側から嵌挿された一対のサイドプレ
ート10cとによって構成されたハウジング10を有し
ている。ハウジング10の内部には、略長円形のギア室
13が区画されている。ギアポンプ1は、ポンプ作用を
なすために、ギア室13内に配置された互いに対をなす
駆動ギア14および従動ギア15を備えている。
The rotating shaft 21 is provided so as to protrude from one end of the motor 2. The shaft joint 3 is attached to an end of the rotating shaft 21, and the shaft joint 3 is drivingly connected to the drive shaft 11 of the gear pump 1. The gear pump 1 has a main body cylinder 10a having a hollow having an oval cross section penetrating the central part, a pair of cover plates 10b covering the entire surface of both sides of the main body cylinder 10a, and a pair of fits inserted from both sides of the cavity of the main body cylinder 10a. It has a housing 10 constituted by a side plate 10c. A substantially elliptical gear chamber 13 is defined inside the housing 10. The gear pump 1 includes a paired drive gear 14 and a driven gear 15 arranged in a gear chamber 13 to perform a pumping operation.

【0013】ギア室13は、両ギアの噛み合い位置を挟
んだ両側に、吸込室13aと、吐出室13bとを有して
いる。吸込室13aおよび吐出室13bは、ハウジング
10の対応位置に開口する吸込口10eおよび吐出口1
0fを介して、ハウジング10外の図示しない吸込先お
よび吐出先にそれぞれ接続されるようにしてある。ま
た、ギア室13の半円部の一方に駆動ギア14が配置さ
れ、ギア室13の半円部の他方に従動ギア15が配置さ
れている。
The gear chamber 13 has a suction chamber 13a and a discharge chamber 13b on both sides of the meshing position of the two gears. The suction chamber 13a and the discharge chamber 13b have a suction port 10e and a discharge port
Via 0f, it is connected to a suction destination and a discharge destination (not shown) outside the housing 10. Further, a drive gear 14 is arranged on one of the semicircular portions of the gear chamber 13, and a driven gear 15 is arranged on the other of the semicircular portions of the gear chamber 13.

【0014】駆動ギア14は、一体に形成された駆動軸
11によって、ギア室13の半円部の一方の軸心上に位
置してハウジング10に回転自在に支持されている。従
動ギア15は、駆動軸11に平行な軸線を有した支持軸
17によって、ギア室13の他方の半円部の軸心上に位
置してハウジング10に回転自在に支持されている。駆
動ギア14と従動ギア15とは、同数の歯を有し、互い
に噛み合っており、駆動ギア14の回転に伴って、従動
ギア15が従動回転するようにしてある。
The drive gear 14 is rotatably supported by the housing 10 on one axis of a semicircular portion of the gear chamber 13 by an integrally formed drive shaft 11. The driven gear 15 is rotatably supported by the housing 10 at a position on the axis of the other semicircular portion of the gear chamber 13 by a support shaft 17 having an axis parallel to the drive shaft 11. The drive gear 14 and the driven gear 15 have the same number of teeth and mesh with each other, so that the driven gear 15 is driven to rotate as the drive gear 14 rotates.

【0015】このギアポンプ1では、吸込口10eを経
て吸込室13aに導入される油等の作動流体は、吸込室
13aに臨む駆動ギア14および従動ギア15の歯間に
受け入れられ、両ギアの回転により、それぞれの歯間
と、ギア室13の内周面との間に封止された状態で搬送
され、吐出室13bに送り出される。駆動ギア14は、
その外周部に等間隔で配置された複数の歯を有してい
る。この歯数Ntは、例えば、13であり、モータ2の
整流子数Ncに応じた値に設定されている。すなわち、
歯数Ntと整流子数Ncとの最小公倍数Mが、後述する
ように騒音低減に寄与できる所定値R以上となる値に設
定されている。ここで、騒音低減に寄与できる所定値R
以上とは、ギア騒音とモータ騒音との共振周波数Fr
が、人間にとって聴感が鈍くなる周波数、例えば10k
Hz以上を実現できるような、歯数Ntおよび整流子数
Ncの最小公倍数の値であり、具体的には、所定値Rは
17kHz以上(ポンプの回転速度4000RPM、ギ
アの歯数が13、整流子数が20の場合)である。
In this gear pump 1, a working fluid such as oil introduced into the suction chamber 13a through the suction port 10e is received between the teeth of the drive gear 14 and the driven gear 15 facing the suction chamber 13a, and the rotation of both gears is performed. As a result, the sheet is conveyed in a sealed state between the respective teeth and the inner peripheral surface of the gear chamber 13, and is sent to the discharge chamber 13b. The drive gear 14 is
The outer peripheral portion has a plurality of teeth arranged at equal intervals. The number of teeth Nt is, for example, 13, and is set to a value corresponding to the number of commutators Nc of the motor 2. That is,
The least common multiple M of the number of teeth Nt and the number of commutators Nc is set to a value that is equal to or greater than a predetermined value R that can contribute to noise reduction, as described later. Here, a predetermined value R that can contribute to noise reduction
The above is the resonance frequency Fr between the gear noise and the motor noise.
However, the frequency at which human hearing becomes dull, for example, 10 k
Hz or more is a value of the least common multiple of the number of teeth Nt and the number of commutators Nc, and more specifically, the predetermined value R is 17 kHz or more (the rotational speed of the pump is 4000 RPM, the number of gear teeth is 13, (When the number of children is 20).

【0016】なお、共振周波数Frは、10kHz以上
であればよく、より高い周波数とすれば体感上の騒音を
より確実に低減することができる。また、駆動ギア14
の歯数Ntは、モータ2の整流子数Ncに対して、互い
に素の関係にある値とされている。それゆえ、歯数Nt
および整流子数Ncを極端に大きくすることなく、最小
公倍数を大きくして所定値R以上にすることができる。
It is sufficient that the resonance frequency Fr is 10 kHz or more. If the resonance frequency is set to a higher frequency, sensational noise can be more reliably reduced. The driving gear 14
The number of teeth Nt is a value which is relatively prime to the number of commutators Nc of the motor 2. Therefore, the number of teeth Nt
In addition, the least common multiple can be increased to be equal to or larger than the predetermined value R without extremely increasing the number Nc of commutators.

【0017】次に、この電動ポンプユニットAの動作を
説明する。モータ2は、所定の運転条件、例えば、40
00RPMの回転速度で運転される。それに伴い、ギア
ポンプ1の駆動ギア14および従動ギア15も同じ回転
速度で回転する。この動作に伴い、作動流体が送出され
る。ところで、この電動ポンプユニットAでは、モータ
2のブラシ23に起因したモータ騒音と、ギアポンプ1
の駆動ギア14に起因したギア騒音とが合わさった複合
騒音が発生する場合がある。
Next, the operation of the electric pump unit A will be described. The motor 2 operates under predetermined operating conditions, for example, 40
Operated at a rotational speed of 00 RPM. Accordingly, the drive gear 14 and the driven gear 15 of the gear pump 1 also rotate at the same rotation speed. Along with this operation, the working fluid is delivered. By the way, in the electric pump unit A, the motor noise caused by the brush 23 of the motor 2 and the gear pump 1
In some cases, a composite noise is generated in which the gear noise caused by the drive gear 14 is combined.

【0018】図3は、電動ポンプユニットAの騒音特性
を説明するためのグラフであり、横軸に周波数(H
z)、縦軸に騒音の大きさを示し、(a)はモータ騒
音、(b)はギア騒音、(c)は複合騒音を示す。モー
タ騒音は、周波数特性で見ると、複数の騒音ピークを有
している。これらの騒音ピークの各周波数FB1,FB2
…には、整流子数Ncまたはその倍数(×2,×3,
…)と、モータ2の回転軸21の回転速度Vmとに関連
しているものがある。
FIG. 3 is a graph for explaining the noise characteristics of the electric pump unit A. The frequency (H) is plotted on the horizontal axis.
z), the vertical axis indicates the magnitude of noise, (a) indicates motor noise, (b) indicates gear noise, and (c) indicates composite noise. The motor noise has a plurality of noise peaks in terms of frequency characteristics. Each frequency F B1 , F B2 ,
... include the number Nc of commutators or a multiple thereof (× 2, × 3,
..) And the rotation speed Vm of the rotating shaft 21 of the motor 2.

【0019】ギア騒音は、周波数特性で見ると、複数の
騒音ピークを有している。これらの騒音ピークの各周波
数FG1,FG2,…には、駆動ギア14の歯数Ntまたは
その倍数(×2,×3,…)と、駆動ギア14の回転速
度Vpとに関連しているものがある。なお、本実施の形
態では、回転速度Vp=回転速度Vmである。また、複
合騒音は、周波数特性で見ると、複数の騒音ピークを有
している。これらの騒音ピークの各周波数FC1,FC2
…には、ギア騒音の各周波数FG1,F G2,…と、モータ
騒音の各周波数FB1,FB2,…との少なくとも一方と一
致しているものがある。例えば、周波数FC1は周波数F
B1と一致している。また、歯数Ntと整流子数Ncとの
最小公倍数に関連している周波数FC260(共振周波数F
r)は、17.3kHz(モータ2が4000RPMの
とき)と高く、聴感が鈍くなる周波数、例えば、10k
Hz以上にできているので、モータ騒音とギア騒音の騒
音ピーク同士が重なり合って、大きな騒音ピークとなっ
ていても問題ない。
The gear noise can be seen from a plurality of frequencies in terms of frequency characteristics.
Has a noise peak. Each frequency of these noise peaks
Number FG1, FG2,... Include the number of teeth Nt of the drive gear 14 or
The multiple (× 2, × 3,...) And the rotation speed of the drive gear 14
Some are related to the degree Vp. The form of this implementation
In the state, the rotation speed Vp = the rotation speed Vm. Also,
Synthetic noise has multiple noise peaks when viewed in frequency characteristics.
doing. Each frequency F of these noise peaksC1, FC2,
... each gear noise frequency FG1, F G2, ... and the motor
Each frequency F of noiseB1, FB2, ... and at least one and one
There is something I do. For example, the frequency FC1Is the frequency F
B1Matches. In addition, the number of teeth Nt and the number of commutators Nc
The frequency F associated with the least common multipleC260(Resonant frequency F
r) is 17.3 kHz (Motor 2 is 4000 RPM)
Frequency) and the frequency at which hearing becomes dull, for example, 10 k
Hz or higher, the noise of motor noise and gear noise
The sound peaks overlap, resulting in a loud noise peak
There is no problem even if you do.

【0020】このように本実施の形態によれば、以下の
効果を奏する。すなわち、駆動ギア14の歯数Ntと整
流子数Ncの最小公倍数を設定すると、ギア騒音とモー
タ騒音との共振周波数Frを決めることができる。この
共振周波数Frを、歯数Ntと整流子数Ncの最小公倍
数を所定値R以上とすることによって、聴感が鈍くなる
周波数以上としたので、体感上の騒音を低減することが
できる。
According to the present embodiment, the following effects can be obtained. That is, by setting the least common multiple of the number of teeth Nt of the drive gear 14 and the number of commutators Nc, the resonance frequency Fr between the gear noise and the motor noise can be determined. Since the resonance frequency Fr is set to a frequency equal to or lower than the frequency at which the hearing becomes dull by setting the least common multiple of the number of teeth Nt and the number of commutators Nc to a predetermined value R or more, it is possible to reduce bodily noise.

【0021】また、歯数Ntと整流子数Ncとを互いに
素とすることによって、歯数Ntと整流子数Ncの両者
の最小公倍数を所定値R以上にするために、歯数Ntと
整流子数Ncを極端に多くする必要がないので、上述の
ように騒音の低減を図る際に、ギアポンプ1や電動ポン
プユニットAの大型化を回避することができる。従っ
て、従来のギアポンプや電動ポンプユニットとほぼ同じ
大きさ、能力を維持しつつ、騒音の低減を実現すること
ができる。
Further, by making the number of teeth Nt and the number of commutators Nc relatively prime, the number of teeth Nt and the number of commutators Nc are adjusted so that the least common multiple of both the number of teeth Nt and the number of commutators Nc becomes a predetermined value R or more. Since it is not necessary to increase the number of children Nc extremely, it is possible to avoid an increase in the size of the gear pump 1 and the electric pump unit A when reducing noise as described above. Therefore, noise can be reduced while maintaining substantially the same size and performance as the conventional gear pump and electric pump unit.

【0022】例えば、整流子数Nc=20、歯数Nt=
13の本発明の場合には、最小公倍数を260と、整流
子数Nc=20、歯数Nt=12の従来の場合の最小公
倍数が60であるのに比べて格段に大きくすることがで
きる。従って、共振周波数Frを約4.3倍に高くする
ことができる。しかも、本実施形態の歯数(13)は、
従来の歯数(12)との差も小さいので、ギアポンプと
して構成した場合にポンプ能力やポンプの大きさを従来
と同程度とすることができる。
For example, the number of commutators Nc = 20 and the number of teeth Nt =
In the case of the thirteenth aspect of the present invention, the least common multiple is 260, which can be much larger than the conventional least common multiple with commutator number Nc = 20 and tooth number Nt = 12 being 60. Therefore, the resonance frequency Fr can be increased to about 4.3 times. Moreover, the number of teeth (13) in the present embodiment is
Since the difference from the conventional number of teeth (12) is small, it is possible to make the pump capacity and the size of the pump equal to those of the conventional gear pump when configured as a gear pump.

【0023】なお、上述の実施の形態では、駆動ギア1
4の回転速度は、モータ2の回転速度と等しく設定され
ていたが、異なっていても構わない。また、歯数Ntお
よび整流子数Ncの組合せは、上述の組合せ(13,2
0)の他に(11,20)、(17,20)等の組合せ
を例示することができる。また、上述の実施の形態で
は、歯数Ntと整流子数Ncとの最小公倍数の所定値R
を設定したが、換言すれば、この所定値Rを電動ポンプ
ユニットAの運転条件に応じた値に設定してもよく、要
は、ギア騒音とモータ騒音との共振周波数Frが、人間
にとって聴感が鈍くなる周波数以上を実現できるよう
な、歯数Ntと整流子数Ncの最小公倍数の値であれば
よい。
In the above embodiment, the driving gear 1
The rotation speed of the motor 4 is set equal to the rotation speed of the motor 2, but may be different. Also, the combination of the number of teeth Nt and the number of commutators Nc is the combination (13, 2
In addition to (0), combinations such as (11, 20) and (17, 20) can be exemplified. In the above embodiment, the predetermined value R of the least common multiple of the number of teeth Nt and the number of commutators Nc is used.
In other words, the predetermined value R may be set to a value corresponding to the operating conditions of the electric pump unit A. In short, the resonance frequency Fr between the gear noise and the motor noise is determined by The value may be a value of the least common multiple of the number of teeth Nt and the number of commutators Nc that can realize a frequency or higher at which the frequency becomes lower.

【0024】その他、本発明の要旨を変更しない範囲で
種々の設計変更を施すことが可能である。
In addition, various design changes can be made without changing the gist of the present invention.

【0025】[0025]

【発明の効果】請求項1に係る発明によれば、以下の効
果を奏する。すなわち、ギア歯数および整流子数の最小
公倍数を所定値以上に設定することによって、ギア騒音
とモータ騒音との共振周波数を、聴感が鈍くなる周波数
以上にできるので、体感上の騒音を低減することができ
る。その結果、低騒音のギアポンプを実現することがで
きる。
According to the first aspect of the present invention, the following effects can be obtained. That is, by setting the least common multiple of the number of gear teeth and the number of commutators to a predetermined value or more, the resonance frequency of the gear noise and the motor noise can be made higher than the frequency at which the sense of hearing becomes dull. be able to. As a result, a low noise gear pump can be realized.

【0026】請求項2に係る発明によれば、請求項1に
かかる発明の効果に加えて、歯数と整流子数とを互いに
素とすることによって、上述のように騒音を低減するた
めに歯数や整流子数を極端に多くする必要がないので、
ギアポンプ、ひいては電動ポンプユニットの大型化を回
避することができる。
According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the number of teeth and the number of commutators are made relatively prime to reduce noise as described above. Since it is not necessary to increase the number of teeth and commutators extremely,
It is possible to avoid an increase in the size of the gear pump and thus the electric pump unit.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施の形態にかかるギアポンプを含
む電動ポンプユニットの概略構成を示す正面図である。
FIG. 1 is a front view showing a schematic configuration of an electric pump unit including a gear pump according to an embodiment of the present invention.

【図2】図1のギアポンプの断面側面図であり、図1の
II─II線に沿う断面図であってハッチングを省略してあ
る。
FIG. 2 is a cross-sectional side view of the gear pump of FIG. 1;
FIG. 2 is a cross-sectional view taken along the line II-II, with hatching omitted.

【図3】図1の電動ポンプユニットの騒音特性を説明す
るためのグラフであり、横軸に周波数(Hz)、縦軸に
騒音の大きさを示し、(a)はモータ騒音、(b)はギ
ア騒音、(c)は複合騒音を示す。
3 is a graph for explaining noise characteristics of the electric pump unit of FIG. 1, in which a horizontal axis indicates frequency (Hz), a vertical axis indicates noise magnitude, (a) indicates motor noise, and (b) Indicates gear noise, and (c) indicates composite noise.

【符号の説明】[Explanation of symbols]

1 ギアポンプ 2 モータ 14 駆動ギア(ギア) 23 ブラシ DESCRIPTION OF SYMBOLS 1 Gear pump 2 Motor 14 Drive gear (gear) 23 Brush

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】整流子付き駆動用モータで駆動されるギア
を有するギアポンプにおいて、 上記ギアの歯数および整流子数の最小公倍数を騒音低減
に寄与できる所定値以上としたことを特徴とするギアポ
ンプ。
1. A gear pump having a gear driven by a drive motor with a commutator, wherein the number of teeth of the gear and the least common multiple of the number of commutators are set to predetermined values or more that can contribute to noise reduction. .
【請求項2】請求項1に記載のギアポンプにおいて、 上記歯数と整流子数とは、互いに素であることを特徴と
するギアポンプ。
2. The gear pump according to claim 1, wherein the number of teeth and the number of commutators are relatively prime.
JP16622697A 1997-06-23 1997-06-23 Gear pump Expired - Fee Related JP3599960B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16622697A JP3599960B2 (en) 1997-06-23 1997-06-23 Gear pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16622697A JP3599960B2 (en) 1997-06-23 1997-06-23 Gear pump

Publications (2)

Publication Number Publication Date
JPH1113643A true JPH1113643A (en) 1999-01-19
JP3599960B2 JP3599960B2 (en) 2004-12-08

Family

ID=15827458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16622697A Expired - Fee Related JP3599960B2 (en) 1997-06-23 1997-06-23 Gear pump

Country Status (1)

Country Link
JP (1) JP3599960B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907174A1 (en) * 2006-10-11 2008-04-18 Denso Corp INTERNAL COMBUSTION ENGINE STARTING DEVICE HAVING REDUCED NOISE
JP2010174714A (en) * 2009-01-29 2010-08-12 Hitachi Automotive Systems Ltd Electric pump, and electric pump for brake
JP2011048284A (en) * 2009-08-28 2011-03-10 Ricoh Co Ltd Image forming apparatus
CN102148547A (en) * 2010-02-10 2011-08-10 万都株式会社 Motor pulley
JP2014084846A (en) * 2012-10-26 2014-05-12 Asmo Co Ltd Electric pump
WO2018206189A1 (en) * 2017-05-08 2018-11-15 Robert Bosch Gmbh External gear machine, and exhaust gas heat recovery system having an external gear machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907174A1 (en) * 2006-10-11 2008-04-18 Denso Corp INTERNAL COMBUSTION ENGINE STARTING DEVICE HAVING REDUCED NOISE
JP2008095590A (en) * 2006-10-11 2008-04-24 Denso Corp Internal combustion engine starter
JP2010174714A (en) * 2009-01-29 2010-08-12 Hitachi Automotive Systems Ltd Electric pump, and electric pump for brake
JP2011048284A (en) * 2009-08-28 2011-03-10 Ricoh Co Ltd Image forming apparatus
CN102148547A (en) * 2010-02-10 2011-08-10 万都株式会社 Motor pulley
JP2014084846A (en) * 2012-10-26 2014-05-12 Asmo Co Ltd Electric pump
WO2018206189A1 (en) * 2017-05-08 2018-11-15 Robert Bosch Gmbh External gear machine, and exhaust gas heat recovery system having an external gear machine

Also Published As

Publication number Publication date
JP3599960B2 (en) 2004-12-08

Similar Documents

Publication Publication Date Title
JP5047439B2 (en) Motor / pump unit
JP3870642B2 (en) Electric compressor
JP4789280B2 (en) Motor shaft and micro motor for micro motor
JP3599960B2 (en) Gear pump
JP2010110142A (en) Permanent magnet type rotary electric machine and compressor using the same
KR960018251A (en) Combined Dry Vacuum Pump
JP2005098268A (en) Electric internal gear pump
JP2000120810A (en) Motor incorporated reduction gear
JP4176251B2 (en) Blood pump
JP3904786B2 (en) Gear pump
JP5208004B2 (en) Electric pump for brake
JPS61138893A (en) Trochoidal oil pump
JP6870424B2 (en) Ground structure of power transmission mechanism for electric vehicles
JP2021169791A (en) Oil pump
JP2004204694A (en) Electric inscribed gear pump
JPS6285764A (en) Motor-operated type power steering device
JPH0569389U (en) Dry vacuum pump
JPH09256965A (en) Oil pump rotor
JP3784683B2 (en) motor
JPS63262071A (en) Ultrasonic motor
JP2004251202A (en) Trochoid pump
JP2864357B2 (en) Roots pump for sewage
JP2023086034A (en) Driving device
JP2004204695A (en) Electric inscribed gear pump
JP2658352B2 (en) Trochoid rotor of internal oil pump

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040812

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20040824

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20040915

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20070924

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080924

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090924

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100924

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110924

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120924

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130924

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees