WO2010016473A1 - 内接歯車式ポンプ用ロータとそれを用いた内接歯車式ポンプ - Google Patents
内接歯車式ポンプ用ロータとそれを用いた内接歯車式ポンプ Download PDFInfo
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- WO2010016473A1 WO2010016473A1 PCT/JP2009/063779 JP2009063779W WO2010016473A1 WO 2010016473 A1 WO2010016473 A1 WO 2010016473A1 JP 2009063779 W JP2009063779 W JP 2009063779W WO 2010016473 A1 WO2010016473 A1 WO 2010016473A1
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- Prior art keywords
- circle
- rotor
- tooth
- center
- inner rotor
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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
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19949—Teeth
- Y10T74/19963—Spur
- Y10T74/19972—Spur form
Definitions
- the internal gear pump is used as an oil pump for lubricating a car engine and an automatic transmission (AT).
- AT automatic transmission
- rotors for pumps used in this internal gear type pump there is a combination of an inner rotor and an outer rotor with one tooth difference, and in addition, a trochoid curve is used in that type of rotor. Some have created the tooth profile of the rotor, and some have created the tooth profile of the rotor with a cycloid curve.
- the tooth profile created using the trochoid curve is created using a basic circle E and a rolling circle F that rolls on the basic circle E without slipping, as shown in FIG.
- the tooth profile of the inner rotor 2 is created by the envelope of the arc group of the locus circle G having a constant diameter centered on the trochoid curve (see Patent Document 1 below).
- the value of the basic circle E, the rolling circle F, the locus circle G, and the amount of eccentricity e is set to one for each tooth profile.
- the tooth height may be increased in order to increase the discharge amount.
- the eccentricity e between the inner rotor and the outer rotor is increased for the purpose of increasing the tooth height, the tooth width is reduced. Or the tooth profile design itself becomes impossible. Therefore, the amount of eccentricity e is restricted, and therefore the tooth height is also limited, making it difficult to meet the demand for increasing the discharge rate.
- the discharge amount can be increased. However, when the number of teeth is increased, the diameter of the rotor becomes large, and it is difficult to meet the requirement of increasing the discharge amount without changing the outer diameter of the rotor.
- This invention provides a degree of freedom in setting the tooth height of a pump rotor that combines an inner rotor and an outer rotor with a single tooth difference, thereby increasing the pump discharge amount and suppressing discharge pulsation. Is an issue.
- the creation circles B and C are a circle in which the center of the creation circle moves from the movement start point to the movement end point while keeping the diameters Bd and Cd constant, and the center of the creation circle while the diameters Bd and C are reduced. There are two types of circles that move from to the end point. These creation circles can be selected appropriately in consideration of the required performance of the pump.
- the curves AC 1 and AC 2 are preferably curves using a sine function.
- the change rate ⁇ R of the distance from the inner rotor center O I is a curve that satisfies the following expression.
- ⁇ R R ⁇ sin ( ⁇ / 2 ⁇ m / S)
- S number of steps
- m 0 ⁇ S
- the tooth tip vertex T T is set on the straight line L 2 at a position rotated by an angle ⁇ T from the straight line L 1.
- tooth bottom vertex T B is set on the straight line L 3 of the position angle theta B rotation from the straight line L 1.
- the angle ⁇ T between the straight line L 1 and the straight line L 2 and the angle ⁇ B between the straight line L 1 and the straight line L 3 are set in consideration of the number of teeth, the ratio of the installation area of the tip portion, and the bottom portion.
- Moving start point Spb of the center of the moving start point Spa and dedendum creation circle C of center of addendum creation circle B is on the straight line L 1.
- These movement end points Lpa and Lpb are on the straight lines L 2 and L 3 .
- the present invention also provides an internal gear type pump rotor configured by combining an inner rotor having the above-described tooth profile and the following outer rotor.
- the tooth profile of the outer rotor is determined by the following process.
- the center O I of the inner rotor revolves around the circle S having a diameter (2e + t) centered on the center of the outer rotor.
- the inner rotor rotates 1 / n times.
- An envelope of the tooth profile curve group formed by the revolution and rotation of the inner rotor is drawn.
- the envelope determined in this way is used as a tooth profile.
- e Eccentricity of the center of the inner rotor and outer rotor t: Tip clearance
- n Number of teeth of the inner rotor
- the tip clearance here is defined as follows. First, the inner rotor is installed in a state in which the center of the inner rotor is located at the origin, and further, the vertex of the tooth tip of the inner rotor is located in a negative region on the Y axis passing through the origin. Next, the center of the outer rotor is at one point on the Y axis that is separated from the origin by the amount of eccentricity e, and the tooth tip vertex of the outer rotor is in contact with the tooth tip vertex of the inner rotor in a negative region on the Y axis. Install the outer rotor.
- a clearance formed between the tooth tip apex of the inner rotor on the Y axis and the tooth tip apex of the outer rotor on the Y axis at the tip clearance measurement position thus created is defined as a tip clearance t.
- R, Bd, ⁇ Bd, Cd, and ⁇ Cd are all numerical values that can be arbitrarily set. Then, several tooth profile models in which these values are variously changed in consideration of the change rate ⁇ R of the movement distance R are prepared, and R, Bd, ⁇ Bd, Cd are selected by a method such as selecting an optimum model from among them. , ⁇ Cd can be found.
- the diameters of the creation circles B and C the diameters at the movement end points Lpa and Lpb are suitably 0.2 times or more and 1 time or less than the diameters at the movement start points Spa and Spb.
- an inversion circle and an abduction circle of a fixed diameter roll on a basic circle of a fixed diameter, and the tooth profile is drawn by a locus of one point on the rolled circle.
- the inversion circle and the abduction circle must make one round on the basic circle when the inversion circle and the abduction circle rotate by the number of teeth. Therefore, the shape of the rotor is determined by the diameter of the base circle, the diameter of the rolling circle, and the number of teeth. Since the tooth height is naturally determined by the diameter of the rolling circle, there is no freedom in changing the tooth height. The same applies to the tooth profile created using the trochoid curve.
- the generating circle does not roll on the basic circle having a constant diameter in at least one of the tooth tip portion and the tooth bottom portion of the inner rotor.
- the creation circle rotates the angle ⁇ at a constant angular velocity, but does not roll on the basic circle.
- the tooth height can be arbitrarily changed by changing the distance difference between R 0 and R 1 or the distance difference between r 0 and r 1 , that is, the radial movement distance R of the creation circle of the tooth tip and root. Can do.
- the tooth height can be freely increased, and the volume of the pump chamber formed between the teeth of the inner rotor and the outer rotor due to the increase of the tooth length is increased. It becomes larger and the discharge amount of the pump increases.
- the internal gear type pump rotor of the present invention has flexibility in setting various conditions such as the diameter of the creation circle, the radial movement distance of the creation circle, and the rate of change of the distance. Will also increase.
- the tooth tip of the inner rotor and the tooth profile of the root are created using a creation circle that moves with a change in diameter, the diameter change amount from the start point to the end point of the creation circle can be changed.
- the tooth profile can be changed, and the degree of freedom in designing the tooth profile is further increased.
- the tooth height which is the sum of the diameters of the addendum and abduction circles, is twice the eccentric amount of the inner rotor and outer rotor (hereinafter simply referred to as the eccentric amount).
- the eccentric amount the eccentric amount of the inner rotor and outer rotor
- the pump rotor of the present invention does not have the concept of a basic circle, and the number of teeth can be determined regardless of the basic circle and the amount of eccentricity. Therefore, there is a degree of freedom in setting the number of teeth. Therefore, it is also possible to reduce the pump discharge pulsation by increasing the number of teeth.
- End view (A) An end view showing still another example of the pump rotor of the present invention (in which the tooth tip of the inner rotor is created using a tooth tip creation circle having a constant diameter), (b) End view of the trapped state An end view showing an example of a pump rotor in which the tooth tip of the inner rotor is created using a creation circle with a diameter change
- the figure which shows the formation method of the tooth profile of an outer rotor 1 is an end view showing the internal gear pump employing the pump rotor of FIG. 1 with the housing cover removed.
- the figure which shows the tooth profile of the rotor for pumps of the invention 1 used in the Example The figure which shows the tooth profile of the rotor for pumps of invention 2 used in the Example
- 2a is a tooth tip of the inner rotor 2
- 2b is a tooth bottom of the inner rotor 2.
- the inner rotor 2 has a shaft hole 2c at the center.
- the inner rotor 2 has a tooth shape that is concentric with the inner rotor and a generating circle B and / or a tooth bottom that passes through a reference point J where a point j on the circumference is an intersection of the reference circle A and the Y axis.
- a specific example of the tooth profile is a combination of a tooth tip and a tooth bottom created based on the following conditions.
- the reference circle A is a circle having a radius from the center of the inner rotor to the boundary point between the tooth tip and the tooth bottom, and the point j starts to move from this circle.
- the diameter of the tooth tip creation circle B is Bd
- a straight line connecting the inner rotor center O I and the reference point J is L 1
- Angle ⁇ SpaO I T T (rotation angle from straight line L 1 to L 2 ) formed by three points of the movement start point Spa of the center of the tooth tip creation circle B, the inner rotor center O I and the tooth tip vertex T T Is ⁇ T
- the center pa of the tooth tip creation circle B is the movement start point Spa (the center position of the tooth tip creation circle B at the position where the point j overlaps the reference point J.
- the movement start point Spa is the straight line L 1.
- the moving end point Lpa (which toward the straight line L 2 side is moved in a range of angle theta T until on the straight line L 2).
- the angular velocity in the circumferential direction of the center pa of the tooth tip creation circle B is constant.
- the center pa of the tooth tip creation circle B moves a distance R in the radial direction of the reference circle A.
- the tooth tip creation circle B rotates at an angle ⁇ , and the point j on the creation circle changes from the reference point J to the tooth tip vertex T T.
- half of the tooth profile of the tooth tip 2a of the inner rotor is drawn by the locus of movement of the point j (refer to FIG. 3 at the same time).
- the tooth profile curve of the inner rotor is completed by reversing the tooth profile curve drawn in this way with respect to the straight line L 2 (making the shape symmetrical about the straight line L 2 ).
- the root curve can be similarly drawn. While rotating the root creation circle C having a diameter Cd at a constant angular velocity in the direction opposite to the direction in which the tooth creation circle B rotates, the center pa of the root creation circle C is moved from the movement start point Spb toward the movement end point Lpb. Move within the range of B. In this case, the tooth profile of the tooth bottom of the inner rotor by the moving trajectory until a point j of the circumference of the dedendum creation circle C has reached the tooth bottom vertex T B which is set on the straight line L 3 from the reference point J Half of is drawn.
- the tooth tip creation circle B and the tooth bottom creation circle C move from the movement start point to the movement end point while keeping their own diameters Bd and Cd constant, and the inner path is traced by the locus of the point j therebetween.
- Half of the tooth profile of the tooth tip 2a of the rotor was drawn.
- the tooth profile creation method is not limited to these.
- the tooth creation circle B and the tooth creation circle C move from the movement start point to the movement end point while changing their diameters, and the tooth j of the inner rotor and the tooth bottom of the tooth bottom of the tooth profile of the inner rotor are moved by the trajectory during which the point j moves.
- the object of the present invention is also achieved by the drawing method.
- FIG. 4 and FIG. 5 show the principle of tooth profile creation when a creation circle with a change in diameter is used.
- the diameter at the movement start point of the tooth creation circle B is defined as Bd max ,
- a straight line connecting the inner rotor center O I and the reference point J is L 1 ,
- the straight line connecting the inner rotor center O I and the tooth tip apex T T L 2
- Angle ⁇ SpaO I T T (rotation angle from straight line L 1 to L 2 ) formed by three points of the movement start point Spa of the center of the tooth tip creation circle B, the inner rotor center O I and the tooth tip vertex T B Is ⁇ T .
- Center pa of the addendum creation circle B is the moving end point Lpa toward the moving start point Spa to the straight line L 2 side (which is on the straight line L 2) rotation angle ⁇ to T moved to.
- the angular velocity in the circumferential direction of the center pa of the tooth tip creation circle B is constant.
- the center pa of the tooth tip creation circle B moves a distance R in the radial direction of the reference circle A.
- the tooth tip creation circle B rotates by an angle ⁇ while the diameter of the center pa of the tooth tip creation circle B is reduced from the movement start point Spa to the movement end point Lpa. Then, the point j on the generative circle B is displaced by the angle ⁇ to set the tooth tip vertex T T on the straight line L 2 (this is because the tooth tip circle having a preset diameter D T intersects the straight line L 2. To the position). During this time, half of the tooth profile of the tooth tip 2a of the inner rotor is drawn by the locus of movement of the point j. Addendum creation circle B has a diameter in the position reached in the tooth tip apex T T is changed to Bd min.
- the straight line L 2 and the tooth profile of the half-teeth depicting the moving direction of the range of directions and angles theta T by and the method described above for the same rotation of the addendum creation circle B is inverted with respect to the straight line L 2 Creating a tooth profile having a symmetrical shape centering on the same as the case of creating a tooth profile using a creation circle having a constant diameter.
- the root curve can be similarly drawn.
- the root creation circle C having a diameter Cd at the movement start point Spb is rotated at a constant angular velocity in a direction opposite to the direction in which the tooth tip creation circle B rotates, and further, the diameter is reduced toward the movement end point Lpb from the movement start point Spb.
- the dedendum creation circle C of a tooth bottom vertex a point j is set on the straight line L 3 from the reference point J circumference T B (which is the root circle and the straight line L 3 of the diameter D B which is set in advance
- a half of the tooth profile of the root of the inner rotor is drawn based on the trajectory that the point j has moved until it reaches (at the intersecting position). Be drawn symmetrically the tooth profile of the half with respect to the straight line L 2 can one tooth of the tooth bottom shape.
- the center pa of the tooth tip creation circle B and the tooth bottom creation circle C is moved on the curves AC 1 and AC 2 where the change rate ⁇ R of the movement distance R is 0 at the movement end points Lpa and Lpb of the creation circle center.
- the tip of the tooth is not sharp, and there is an effect of improving discharge performance (increase in discharge amount) by stabilizing the clearance near the tip clearance, preventing noise during pump operation, and improving the durability of the rotor. .
- the rate of change ⁇ r of the diameter of the tooth creation circle B when the creation circle center moves from the movement start point Spa to the movement end point Lpa while the diameter of the tooth creation circle B is reduced is the movement end points Lpa and Lpb of the creation circle center. Is preferably 0. This makes it easy to increase the radius of curvature of the tooth tip.
- S number of steps
- m 0 ⁇ S r: Difference in radius of the created circle between the movement end point and the movement start point
- the outer rotor 3 is used having one more tooth than the inner rotor 2 (the number of teeth in FIG. 1 is 7).
- the tooth profile of the outer rotor 3 is created by the following steps as shown in FIG. First, the center O I of the inner rotor 2 revolves one revolution on a circle S having a diameter around the center Oo of the outer rotor 3 (2e + t). Meanwhile, the inner rotor 2 rotates 1 / n times. An envelope of the tooth profile curve group formed by the revolution and rotation of the inner rotor is drawn. The envelope determined in this way is used as a tooth profile.
- e Eccentricity between the center of the inner rotor and the center of the outer rotor t: Tip clearance
- n Number of teeth of the inner rotor
- the tooth profile curve of the present invention In the inner rotor 2 in which the curve characterizing the present invention explained in FIG. 2, FIG. 3, FIG. 4 or FIG. 5 (hereinafter referred to as the tooth profile curve of the present invention) is applied to the tooth tip, its root shape is
- the tooth tip creation circle C may be used in the same manner as the tooth tip, or a tooth profile created using a known trochoid curve or a cycloid curve tooth profile may be employed.
- the tooth tip shape in the inner rotor 2 in which the tooth profile curve of the present invention is applied to the tooth bottom, the tooth tip shape may be a tooth profile created using a trochoid curve or a tooth profile of a cycloid curve.
- the tooth profile obtained by combining the tooth profile curve and the cycloid curve of the present invention has a smooth meshing with the outer rotor, which is a feature of the cycloid curve, and can increase the tooth height. Thereby, the request
- the inner rotor 2 and the outer rotor 3 described above are eccentrically arranged and combined to constitute the internal gear type pump rotor 1.
- the internal gear pump rotor 1 is housed in a rotor chamber 6 of a pump housing 5 having a suction port 7 and a discharge port 8, as shown in FIG.
- a drive shaft (not shown) is inserted into the shaft hole 2 c of the inner rotor 2 to engage the inner rotor and the drive shaft, and a driving force is transmitted from the drive shaft to transmit the inner rotor 2.
- the outer rotor 3 is driven and rotated, and the volume of the pump chamber 4 formed between the two rotors is increased or decreased to suck and discharge fluid such as oil.
- the tooth root of the tooth profile is created on the curve that increases from the movement start end toward the movement end.
- the center of the creation circle moves on the curve where the distance decreases.
- the creation circle rotates.
- the tooth profile of at least one of the tooth tip or the tooth bottom of the inner rotor 2 is created by the locus of one point on the circumference of the creation circle.
- the volume of the pump chamber 4 formed between the teeth of the inner rotor 2 and the outer rotor 3 becomes larger than that of the conventional product, and the pump discharge amount increases.
- the number of teeth of the inner rotor can be made larger than the number of teeth of a conventional internal gear pump that employs a tooth profile of a trochoid curve or a cycloid curve. Therefore, the number of pump chambers 4 formed between the teeth of the inner rotor 2 and the outer rotor 3 is larger than that of the conventional product, and the pump discharge amount is increased.
- the tooth profile creation conditions can be set freely, the degree of freedom in tooth profile design is increased.
- the tooth tip creation circle and the root creation circle are created by changing the shape of the tooth tip. Since the clearance around the tip clearance can be adjusted, the tooth profile design is particularly flexible.
- Figure 8 is the condition addendum diameter of the inner rotor 2 (diameter of the addendum circle) is equal, while reducing the diameter of the tip creating a circle B, from the inner rotor center O I to the center of the tip creating a circle B 4 is a tooth profile drawn by the method of FIG. 4 with the amount of change in distance increased by an amount corresponding to the reduction amount of the diameter of the tooth creation circle B.
- the tooth profile Compared with the tooth profile of the inner rotor of FIG. 1 created using the tooth creation circle B having a constant diameter, the tooth profile has a larger radius of curvature of the tooth tip and can reduce the gap between the outer rotor tooth tip and the vicinity. I can do it. Therefore, the volumetric efficiency of the pump is improved.
- FIGS. 6 and 7 show another embodiment of the pump rotor 1 of the present invention.
- the internal gear type pump rotor of FIG. 6 has a design in which the tooth profile curve of the present invention is applied to both the tooth tip 2 a and the tooth bottom 2 b of the inner rotor 2.
- the tooth profile curve of the present invention is applied to the tooth tip 2a of the inner rotor 2, and the tooth bottom 2b is constituted by a cycloid curve.
- the internal gear type pump rotor shown in FIGS. 6 and 7 uses a generating circle having a constant diameter for generating the tooth profile curve of the invention.
- the internal gear type pump rotor of the present invention has a degree of freedom in tooth profile design even when a generating circle having a constant diameter is used.
- the cycloid curve of the tooth tip of Comparative Example 1 was created by rolling an abduction circle having a diameter of 3.25 mm without slipping on a basic circle having a diameter of ⁇ 39 mm.
- the cycloid curve of the tooth bottom was created by rolling an inward circle having a diameter of 3.25 mm on a basic circle having a diameter of 39 mm without sliding.
- the diameter of the tip of the inner rotor and the outer rotor (the diameter of the tip circle), the root diameter (the diameter of the root circle), and the eccentricity e of the created inner rotor and outer rotor are as follows.
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Abstract
Description
また、同じ歯丈でも歯数を増やすと吐出量を増やすことが可能になる。しかし、歯数を増やすとロータの径寸法が大きくなってしまい、ロータの外径寸法を変えずに吐出量を増加させるという要求に応えるのが難しい。
すなわち、下記の条件を満たして創成円B,Cが移動し、その間にインナーロータ中心OIと同心である基準円A上の基準点Jと重なる点jであって、前記創成円B,C上の1点jが描く軌跡曲線によって歯形の歯先曲線、歯底曲線の少なくとも一方を構成した。
-創成円B,Cの移動条件-
インナーロータ中心OIとそれぞれの創成円中心paとの距離を距離R変化させながら、前記点jが前記基準円A上の基準点Jに重なるように前記創成円B,Cを配置したときに中心が位置決めされる移動始点Spa,Spbから前記点jが歯先頂点TT又は歯底頂点TBに位置するように前記創成円B,Cを配置したときに中心が位置決めされる移動終点Lpa,Lpbへ前記創成円B,Cの中心paが移動する。その間に創成円B,Cがその円の移動方向と同方向に一定角速度で角度θ自転する。
ΔR=R×sin(π/2×m/S)
ここにおいて、S:ステップ数、m=0→S
このアウターロータの歯形は以下の工程により決定される。
インナーロータの中心OIがアウターロータの中心を中心とする直径(2e+t)の円S上を1周公転する。
その間にインナーロータが1/n回自転する。
このインナーロータの公転と自転により形成された歯形曲線群の包絡線を描く。
このようにして決定した前記包絡線を歯形とする。
ここに、
e:インナーロータとアウターロータの中心の偏心量
t:チップクリアランス
n:インナーロータの歯数
まず、インナーロータをインナーロータ中心が原点に位置し、さらに、インナーロータの歯先頂点が前記原点を通るY軸上の負の領域に位置する状態にインナーロータを設置する。
次に、アウターロータ中心が原点から偏心量e離れたY軸上の1点にあり、アウターロータの歯先頂点がY軸上の負の領域で前記インナーロータの歯先頂点に突き合わせる状態にアウターロータを設置する。
そして、その状態からインナーロータの歯形とアウターロータの歯形が接するところまでアウターロータ中心をインナーロータ中心から離れる方向にY軸上を移動させる。このようにして作り出されたチップクリアランスの測定位置で、Y軸上の前記インナーロータの歯先頂点とY軸上の前記アウターロータの歯先頂点間に生じた隙間をチップクリアランスtとする。
歯先高さ=R+(Bd/2)+{(Bd-ΔBd)/2}
歯底深さ=R+(Cd/2)+{(Cd-ΔCd)/2}
創成円B,Cの直径は、移動終点Lpa,Lpbでの直径が移動始点Spa,Spbでの直径に対して0.2倍以上かつ1倍以下が適当である。
図2或は図4における、インナーロータ中心OIから歯先創成円Bの移動始点(=円の中心の移動開始点Spa)までの距離R0、インナーロータ中心OIから歯底創成円Cの移動始点(=円の中心の移動開始点Spb)までの距離r0、直線L2の位置でのインナーロータ中心OIから歯先創成円Bの中心(=移動終点Lpa)までの距離R1、直線L3の位置でのインナーロータ中心OIから歯底創成円Cの中心(=移動終点Lpb)までの距離r1が任意に設定される。そして、R0とR1の距離差や、r0とr1の距離差、すなわち、歯先、歯底の創成円の径方向移動距離Rを変更することで歯丈を任意に変化させることができる。
特に、インナーロータの歯先や歯底の歯形が、径変化を伴って移動する創成円を用いて創成されたものは、創成円の移動始点から移動終点に至る間の直径変化量を変えることにより、歯形を変化させることができるため、歯形設計の自由度がより高まる。
インナーロータ中心OIと前記基準点Jを結ぶ直線をL1、
インナーロータの中心OIと歯先頂点TTを結ぶ直線をL2、
前記歯先創成円Bの中心の移動始点Spaと、インナーロータ中心OIおよび前記歯先頂点TTの3点で作られる角度∠SpaOITT(直線L1からL2までの回転角)をθTとする。
前記歯先創成円Bの中心paが、移動始点Spa(前記点jが前記基準点Jに重なる位置での歯先創成円Bの中心位置であり、図2ではその移動始点Spaが直線L1上にある)から、前記直線L2側に向って移動終点Lpa(これは直線L2上にある)まで角度θTの範囲で移動する。このとき、前記歯先創成円Bの中心paの周方向の角速度は一定である。
この間に前記歯先創成円Bの中心paは、基準円Aの径方向に距離R移動する。
この歯先創成円Bの中心paが、移動始点Spaから移動終点Lpaに至る間に、歯先創成円Bは角度θ自転し、創成円上の点jが基準点Jから歯先頂点TTに到達する。この間に前記点jが移動した軌跡によってインナーロータの歯先2aの歯形の半分が描かれる(図3も同時参照)。
図4において、
歯先創成円Bの移動始点における直径をBdmax、
インナーロータ中心OIと前記基準点Jを結ぶ直線をL1、
インナーロータ中心OIと歯先頂点TTを結ぶ直線をL2、
前記歯先創成円Bの中心の移動始点Spaと、インナーロータ中心OIおよび前記歯先頂点TBの3点で作られる角度∠SpaOITT(直線L1からL2までの回転角)をθTとする。
前記歯先創成円Bの中心paが、移動始点Spaから前記直線L2側に向って移動終点Lpa(これは直線L2上にある)まで回転角θT移動する。このとき、前記歯先創成円Bの中心paの周方向の角速度は一定である。
この間に前記歯先創成円Bの中心paは、基準円Aの径方向に距離R移動する。
ΔR=R×sin(π/2×m/S)
ここにおいて、S:ステップ数、m=0→S
こうすると、m=Sでの変化率ΔRは0となり、滑らかな曲線を描くことができる。この際、創成円中心paの周方向移動量Δθは、
Δθ=θT/S
である。
Δr=r×sin(π/2×m/S)
ここにおいて、S:ステップ数、m=0→S
r:移動終点と移動始点での創成円の半径の差
ここに、
e:インナーロータの中心とアウターロータの中心の偏心量
t:チップクリアランス
n:インナーロータの歯数
または、そうすることでインナーロータの歯数を、トロコイド曲線の歯形やサイクロイド曲線の歯形を採用した従来の内接歯車式ポンプの歯数よりも多くすることができる。そのために、インナーロータ2とアウターロータ3の歯間に形成されるポンプ室4の数が従来品よりも多くなり、ポンプの吐出量が増加する。
比較例1(図17参照)
歯先曲線:サイクロイド曲線
歯底曲線:サイクロイド曲線
発明品1(図11参照)
歯先曲線:サイクロイド曲線
歯底曲線:発明歯形曲線(歯底頂点でのΔR=0)
発明品2(図12参照)
歯先曲線:発明歯形曲線(歯先頂点でのΔR≠0)
歯底曲線:発明歯形曲線(歯底頂点でのΔR=0)
発明品3(図13参照)
歯先曲線:発明歯形曲線(歯先頂点でのΔR=0)
歯底曲線:発明歯形曲線(歯底頂点でのΔR=0)
発明品4(図14参照)
歯先曲線:発明歯形曲線(歯先頂点でのΔR=0、創成円直径が変化)
歯底曲線:発明歯形曲線(歯底頂点でのΔR=0、創成円直径が変化)
アウターロータ外径:φ60mm
インナーロータ内径:φ15mm
ロータ厚み:15mm
であり、各歯形は以下の方法で創成した。この際、アウターロータはいずれも、組み合わせ相手のインナーロータを用いて図9の方法で求めた歯形曲線群の包絡線により歯形を創成した。
比較例1の歯先のサイクロイド曲線は、直径φ39mmの基礎円上を、直径φ3.25mmの外転円を滑らずに転がして創成した。歯底のサイクロイド曲線は、直径φ39mmの基礎円上を、直径φ3.25mmの内転円を滑らずに転がして創成した。
創成したインナーロータ、アウターロータの歯先径(歯先円の直径)と歯底径(歯底円の直径)、及び偏心量eは以下の通りである。
インナーロータ歯先径:φ45.5mm
インナーロータ歯底径:φ32.5mm
アウターロータ歯先径:φ39.1mm
アウターロータ歯底径:φ52.1mm
偏心量e:3.25mm
発明品1の歯先のサイクロイド曲線は、直径φ41mmの基礎円上を直径φ2.4mmの外転円を滑らずに転がして創成した。
歯底の発明歯形曲線は、基準円Aと直径が一定である創成円Cを用いて図2の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径Ad:φ41.0mm
創成円Cの直径Cd:φ4.5mm
創成円Cの径方向移動量R:2.3mm
移動距離Rの変化率ΔR:2.3×sin(π/2×m/S)
ステップ数S:30
θB:19.5°
創成したインナーロータ、アウターロータの歯先径と歯底径、偏心量eは以下の通りである。これらの数値は、以下に挙げる発明品2、3、4も同一である。
インナーロータ歯先径:φ45.1mm
インナーロータ歯底径:φ31.5mm
アウターロータ歯先径:φ38.3mm
アウターロータ歯底径:φ51.9mm
偏心量e:3.4mm
発明品2の歯先の発明歯形曲線は、基準円Aと直径が一定である創成円Bを用いて図2の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径Ad:φ40.0mm
創成円Bの直径Bd:φ2.3mm
創成円Bの径方向移動量R:1.1mm
移動距離Rの変化率ΔR:1.1×(m/S)
ステップ数S:30
θB:10.5°
歯底の発明歯形曲線は、図2で説明した基準円Aと直径が一定である創成円Cを用いて図2の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径Ad:φ40.0mm
創成円Cの直径Cd:φ4.3mm
創成円Cの径方向移動量R:2.0mm
移動距離Rの変化率ΔR:2.0×sin(π/2×m/S)
ステップ数S:30
θT:19.5°
発明品3の歯先の発明歯形曲線は、基準円Aと直径が一定である創成円Bを用いて図2の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径Ad:φ40.0mm
創成円Bの直径Bd:φ2.3mm
創成円Bの径方向移動距離R:1.1mm
移動距離Rの変化率ΔR:1.1×sin(π/2×m/S)
ステップ数S:30
θT:10.5°
歯底の発明歯形曲線は、基準円Aと直径が一定である創成円Cを用いて図2の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径Ad:φ40.0mm
創成円Cの直径Cd:φ4.3mm
創成円Cの径方向移動量R:2.0mm
移動距離Rの変化率ΔR:2.0×sin(π/2×m/S)
ステップ数S:30
θT:19.5°
基準円Aの直径Ad:φ41.4mm
歯先創成円Bの移動始点における直径Bdmax:φ2.4mm
移動終点における直径Bdmin:φ0.6mm
歯先創成円の直径の変化率:Δr=1.8×sin(π/2×m/S)
歯先創成円Bの中心の径方向移動距離R:0.7mm
移動距離Rの変化率:ΔR=0.7×sin(π/2×m/S)
ステップ数S:30
θT:10.5°
発明品4の歯底の発明歯形曲線は、基準円Aと移動中に径変を生じる歯底創成円Cを用いて図4の方法で創成した。この際の諸元は以下の通りである。
基準円Aの直径:41.4mm
歯底創成円Cの移動始点における直径Cdmax:φ4.5mm、
移動終点における直径Cdmin:φ4.0mm
歯先創成円の直径の変化率:Δr=0.5×sin(π/2×m/S)
歯底創成円Cの中心の径方向移動距離R:2.9mm
移動距離Rの変化率ΔR:2.9×sin(π/2×m/S)
ステップ数S:30
θB:19.5°
試験条件
油種:ATF
油温:80度
吐出圧:2.5MPa
回転数:3000rpm
2 インナーロータ
2a 歯先
2b 歯底
2c 軸穴
3 アウターロータ
4 ポンプ室
5 ポンプハウジング
6 ロータ室
7 吸入ポート
8 吐出ポート
9 内接歯車式ポンプ
A 基準円
Ad 基準円Aの直径
B 歯先創成円
Bd 歯先創成円Bの直径
Spa 歯先創成円Bの移動始点
Lpa 歯先創成円Bの移動終点
Bdmax 歯先創成円Bの移動始点における直径
Bdmin 歯先創成円Bの移動終点における直径
ΔBd 歯先創成円Bの直径の変化量
C 歯底創成円
Cd 歯底創成円Cの直径
Spb 歯底創成円Cの移動始点
Lpb 歯底創成円Cの移動終点
Cdmax 歯底創成円Cの移動始点における直径
Cdmin 歯底創成円Cの移動終点端における直径
ΔCd 歯底創成円Cの直径の変化量
AC1 歯先創成円Bの中心が移動する曲線
AC2 歯底創成円Cの中心が移動する曲線
J 基準円A上の基準点
j 創成円上の1点
TT インナーロータの歯先頂点
TB インナーロータの歯底頂点
L1 インナーロータ中心OIと基準点Jとを結ぶ直線
L2 インナーロータ中心OIと歯先頂点TTを結ぶ直線
L3 インナーロータ中心OIと歯底頂点TBを結ぶ直線
θT 直線L1から直線L2までの回転角(∠SpaOITT)
θB 直線L1から直線L3までの回転角(∠SpbOITB)
R 創成円の径方向移動距離
ΔR 距離Rの変化率
pa 創成円中心
R0,R1 インナーロータ中心OIから歯先創成円Bの中心までの距離
r0,r1 インナーロータ中心OIから歯底創成円Cの中心までの距離
DT インナーロータの歯先円の直径
DB インナーロータの歯底円の直径
e インナーロータとアウターロータの偏心量
t チップクリアランス
n インナーロータの歯数
OI インナーロータ中心
OO アウターロータ中心
S 2e+tの直径を持つ円
E 基礎円
F 転円
TC トロコイド曲線
G 軌跡円
Claims (9)
- 歯数がnのインナーロータ(2)と、歯数が(n+1)のアウターロータ(3)を組み合わせ、両ロータの歯間に形成されるポンプ室(4)のロータ回転に伴う容積変化によって流体を吸入、吐出する内接歯車式ポンプ用のロータであって、
下記の条件を満たして創成円(B,C)が移動し、その間にインナーロータ中心(OI)と同心である基準円A上の基準点(J)と重なる点(j)であって、前記創成円(B,C)上の1点(j)が描く軌跡曲線によって歯形の歯先曲線、歯底曲線の少なくとも一方が構成された前記インナーロータ(2)を含む内接歯車式ポンプ用ロータ。
-創成円(B,C)の移動条件-
インナーロータ中心(OI)から創成円中心までの径方向の距離を距離(R)変化させながら、前記点(j)が前記基準円(A)上の基準点(J)に重なるように前記創成円(B,C)を配置したときに中心が位置決めされる移動始点(Spa,Spb)から、前記点(j)が歯先頂点(TT)又は歯底頂点(TB)に位置するように前記創成円(B,C)を配置したときに中心が位置決めされる移動終点(Lpa,Lpb)まで前記創成円(B,C)の中心(pa)が移動し、かつ、前記創成円(B,C)がその円の移動方向と同方向に一定角速度で角度(θ)自転する。 - 一定の径である前記創成円(B,C)の中心(pa)が、移動始点Spa,Spbから移動終点Lpa,Lpbへ移動し、その一定径である創成円(B,C)の外周の点(j)が描く軌跡曲線によって歯形の歯先曲線と歯底曲線の少なくとも一方が構成された前記インナーロータ(2)を含む請求項1に記載の内接歯車式ポンプ用ロータ。
- 前記創成円(B,C)が直径を縮めながら、前記創成円(B,C)の中心(pa)が移動始点(Spa,Spb)から移動終点(Lpa,Lpb)へ移動し、その径変化を伴う創成円(B,C)の外周の点(j)が描く軌跡曲線によって歯形の歯先曲線と歯底曲線の少なくとも一方が構成された前記インナーロータ(2)を含む請求項1に記載の内接歯車式ポンプ用ロータ。
- 前記創成円の中心(pa)が、インナーロータ中心(OI)から創成円中心(pa)までの距離の変化率(ΔR)が移動終点において0である曲線(AC1,AC2)上を移動する請求項1乃至3のいずれかに記載の内接歯車式ポンプ用ロータ。
- 前記曲線(AC1,AC2)が正弦曲線である請求項4に記載の内接歯車式ポンプ用ロータ。
- 前記曲線(AC1,AC2)とインナーロータ中心(OI)との距離の変化率(ΔR)が、下記式
ΔR=R×sin(π/2×m/S)
ここにおいて、S:ステップ数、m=0→S
を満たす請求項4又は5に記載の内接歯車式ポンプ用ロータ。 - 前記創成円(B,C)の直径(Bd,Cd)が、移動終点(Lpa,Lpb)の位置において移動始点(Spa,Spb)での直径の0.2倍以上、かつ、1倍以下の大きさである請求項3乃至6のいずれかに記載の内接歯車式ポンプ用ロータ。
- 請求項1乃至7のいずれかに記載のインナーロータ(2)と、アウターロータを組み合わせて構成される内接歯車式ポンプ用ロータであって、
インナーロータ(2)の中心(OI)がアウターロータ(3)の中心(OO)を中心とする直径(2e+t)の円(S)上を1周公転し、
その間にインナーロータ(2)が1/n回自転し、
このインナーロータの公転と自転により形成された歯形曲線群の包絡線を描き、
この様にして決定した前記包絡線を歯形として有する前記アウターロータを含む内接歯車式ポンプ用ロータ。
ここに、
e:インナーロータの中心とアウターロータの中心の偏心量
t:チップクリアランス
n:インナーロータの歯数 - 請求項1乃至8のいずれかに記載のポンプ用ロータ(1)を、ポンプハウジング(5)に設けられたロータ室(6)に収納して構成される内接歯車式ポンプ。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US12/682,025 US8632323B2 (en) | 2008-08-08 | 2009-08-04 | Internal gear pump rotor, and internal gear pump using the rotor |
KR1020107006842A KR101107907B1 (ko) | 2008-08-08 | 2009-08-04 | 내접 기어식 펌프용 로터와 그것을 이용한 내접 기어식 펌프 |
JP2010501304A JP4600844B2 (ja) | 2008-08-08 | 2009-08-04 | 内接歯車式ポンプ用ロータとそれを用いた内接歯車式ポンプ |
ES09804956.2T ES2656432T3 (es) | 2008-08-08 | 2009-08-04 | Rotor de bomba de engranajes internos, y bomba de engranajes internos que utiliza el rotor |
EP09804956.2A EP2206923B1 (en) | 2008-08-08 | 2009-08-04 | Internal gear pump rotor, and internal gear pump using the rotor |
CN2009801006411A CN101821510B (zh) | 2008-08-08 | 2009-08-04 | 内齿轮泵转子及使用内齿轮泵转子的内齿轮泵 |
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KR (1) | KR101107907B1 (ja) |
CN (1) | CN101821510B (ja) |
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JP5765655B2 (ja) | 2011-10-21 | 2015-08-19 | 住友電工焼結合金株式会社 | 内接歯車ポンプ |
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JP2014181620A (ja) * | 2013-03-19 | 2014-09-29 | Aisin Kiko Co Ltd | ギヤポンプおよびインナーロータの製造方法 |
Also Published As
Publication number | Publication date |
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KR20100059922A (ko) | 2010-06-04 |
EP2206923A1 (en) | 2010-07-14 |
CN101821510A (zh) | 2010-09-01 |
KR101107907B1 (ko) | 2012-01-25 |
ES2656432T3 (es) | 2018-02-27 |
CN101821510B (zh) | 2012-09-05 |
JPWO2010016473A1 (ja) | 2012-01-26 |
US8632323B2 (en) | 2014-01-21 |
US20100209276A1 (en) | 2010-08-19 |
EP2206923B1 (en) | 2017-12-06 |
JP4600844B2 (ja) | 2010-12-22 |
EP2206923A4 (en) | 2014-10-29 |
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