CN100357605C - Cycloidal pin gear hydraulic pump - Google Patents

Cycloidal pin gear hydraulic pump Download PDF

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Publication number
CN100357605C
CN100357605C CNB2003101050739A CN200310105073A CN100357605C CN 100357605 C CN100357605 C CN 100357605C CN B2003101050739 A CNB2003101050739 A CN B2003101050739A CN 200310105073 A CN200310105073 A CN 200310105073A CN 100357605 C CN100357605 C CN 100357605C
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China
Prior art keywords
pin tooth
cycloidal gear
pump
internal rotor
hydraulic pump
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Expired - Fee Related
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CNB2003101050739A
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CN1616825A (en
Inventor
林菁
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Shanghai Normal University
University of Shanghai for Science and Technology
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Shanghai Normal University
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Abstract

The present invention provides a pin gear cycloidal gear hydraulic pump. A transmission axle, a pump core and a valve are arranged in a pump body, wherein the pump core is driven by the transmission axle to rotate, a dipping cavity of the pump core is connected with a delivery conduit through the valve, and the pump core is a pin gear cycloidal gear mechanism and is composed of an inner rotor, pin gears and an inner cycloidal gear, wherein the inner rotor is eccentrically arranged corresponding to the inner cycloidal gear and is meshed with each pin gear which is meshed with the inner cycloidal gear, and the inner rotor, the inner cycloidal gear and every two adjacent pin gears form one dipping cavity; each pin gear is eccentric, the position of a rotating axle is fixed, rotating axes are dispersed on a cylindrical surface which uses the rotation axis of the inner cycloidal gear as an axis. The hydraulic pump has the advantages of a plurality of dipping cavities, no fluctuation in flow rate, less liquid pressure impact, less noise, no liquid transporting process of each cavity, less energy loss, rolling meshing surfaces, less abrasion, long service life, replaced pin gears during the abrasion of the surface of each pin gear, convenient maintenance, easy machining, large liquid discharging quantity, decreased volume of the hydraulic pump and low requirements for liquid to be transported.

Description

A kind of pin tooth cycloidal gear oil hydraulic pump
Technical field:
The present invention relates to a kind of oil hydraulic pump.
Background technique:
At present, Chang Yong hydraulic-pressure pump has gear pump, vane pump, plunger pump, cycloid rotor type pump.All there is shortcoming separately in these pumps.
There is " pocketed oil " in gear pump, hydraulic radial force unbalance, problem such as flow pulsation is big." pocketed oil " makes gear and bearing produce very big additional load, and bearing life is short, and oil pump efficient is low.In addition, " pocketed oil " also can make oily temperature rise, is easy to generate bubble, bubble breaks and causes big noise.The hydraulic radial force unbalance makes gear shaft be subjected to flecition, and imbibition chamber gear radial clearance diminishes, and gear and pump housing inner chamber produce friction or stuck, make the oil pump cisco unity malfunction.Because after hydraulic oil sucks oil pocket, nearly 180 ° along with the rotation of gear, push away again after being transported to pumping cavity, and the gear denticle occupies certain space again, so flowed fluctuation is big, pressure surge is big, causes that impact, vibration and noise are big.
Vane pump complex structure, manufacturing difficulty to the rotating speed sensitivity of axle, with too slow equal cisco unity malfunction, require height to oil too soon, and easy stuck blade causes rapid wearing and tearing behind the sump oil.During high speed, the pressure reduction at blade two ends easily causes the leaf abscission stator surface, causes blade to come to nothing.Under the high pressure, blade and stator surface are easy to wear.Compare with gear pump, noise is big.
The plunger pump complex structure, part is many, makes difficulty, and how the price height is as high-pressure service pump.Similar with vane pump, this pump requires high to oil, easy stuck plunger behind the sump oil.Because the to-and-fro motion of plunger is at a high speed unsuitable.
Cycloid rotor pump, its structure as shown in Figure 6, it is mainly by transmission shaft (1), internal rotor (2), external rotor (14), front cover, rear end cover and the pump housing (6) are formed, internal rotor (2) profile of tooth is a curtate epicycloid, external rotor (14) profile of tooth is a circular arc.Its working principle is the inside and outside rotor (2,14) by means of a pair of eccentric engagement, in engagement process, forms the several separate enclosed space.Along with the engagement rotation of inside and outside rotor (2,14), the volume of each enclosed space changes, and carries out suction liquid; Because inside and outside rotor (2, the 14) number of teeth is few, the working pressure fluctuation is used for the occasion of mesolow greatly more under the high pressure low-speed conditions, rotor required precision height, and external rotor (14) is the gear ring of circle-arc tooth, the manufacturing difficulty.
Summary of the invention:
It is big to the invention provides a kind of quantity delivered, and flowed fluctuation is little, and pressure surge is little, the stable working height, and volume is little, and inside and outside rotor tooth surface wear is few, the oil hydraulic pump of mechanical efficiency height and long service life.
The invention provides a kind of pin tooth cycloidal gear oil hydraulic pump, transmission shaft (1), pump core, valve are housed in the pump housing (6), the pump core is by transmission shaft (1) driven rotary, and the chamber (11) of drawing of pump core links to each other with conveyance conduit by valve, it is characterized in that:
The pump core is a pin tooth cycloidal gear mechanism, is made up of internal rotor (2), pin tooth (3), hypocycloid wheel (4); Internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric, with pin tooth (3) engagement, and pin tooth (3) and hypocycloid wheel (4) engagement, internal rotor (2), hypocycloid wheel (4) and every adjacent two pin teeth (3) all constitute one and draw chamber (11);
Wherein pin tooth (3) is cam pin tooth (3), the rotatingshaft fixed-site, and the spin axis that rotation axis is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis;
The pump core has a plurality of chambeies (11) of drawing, and the quantity of drawing chamber (11) equals the number of pin tooth (3); When transmission shaft (1) driven pump core, hypocycloid wheel (4) and pin tooth (3) all rotate in fixed axis, not only rotation but also revolve round the sun of internal rotor (2), pin tooth (3) constantly changes between the tooth root of the relative tooth of hypocycloid wheel (4) and epicyclodial wheel and tooth top, and the volume that draws chamber (11) changes thereupon.In the course of the work, the line of centers of internal rotor (2) and hypocycloid wheel (4) draws chamber (11) separated into two parts with these, the volume that draws chamber (11) that line of centers passes through is not maximum, be exactly minimum, be in the pocketed oil state, other volumes that draw chamber (11) some (in a side of line of centers) increase, and simultaneously, another part volume reduces.Along with the rotation of line of centers, each draws the increase of chamber (11) volume or reduces always to hocket, and all there are imbibition and discharge opeing each moment like this, has guaranteed the continuity of imbibition and discharge opeing, and each liquid absorption and lifting rate constantly is basic identical, the flow ripple disable.Each is drawn chamber (11), and imbibition and discharge opeing are constantly switched according to certain rule.Therefore, must there be corresponding valve to control imbibition and discharge opeing that each draws chamber (11).Suppose to have Zb pin tooth (3), internal rotor (2) circles certainly, and in revolution Zb-1 week, Zb variation of drawing chamber (11) is suction, discharge opeing Zb * (Zb-1) inferior, discharge opeing number of times height, and lifting rate is big.
The transmission shaft (1) of pin tooth cycloidal gear oil hydraulic pump provided by the invention can drive internal rotor (2) or hypocycloid wheel (4) rotates, when transmission shaft (1) drives internal rotor (2), transmission shaft (1) is stressed little, when transmission shaft (1) drove hypocycloid wheel (4), pin tooth cycloidal gear oil hydraulic pump was carried bigger liquid measure.
The internal rotor (2) of pin tooth cycloidal gear oil hydraulic pump provided by the invention can be an epicyclodial wheel, has both increased the sealing of drawing chamber (11), has increased the variable quantity that draws chamber (11) volume again, is more than 2 times of cycloid formula rotor pump.
The internal rotor (2) of pin tooth cycloidal gear oil hydraulic pump provided by the invention also can be the circle wheel, is more convenient for making.
The valve of pin tooth cycloidal gear oil hydraulic pump provided by the invention can be a flow-distributing valve (9), switch with feed liquor valve and the liquid valve that replaces each to draw chamber (11), be in the volume increase during stage when drawing chamber (11), this draws chamber (11) and communicates with liquid inlet pipe, when drawing chamber (11) when being in volume and reducing the stage, this draws chamber (11) and communicates with drain pipe, thereby makes simple in structure.
The flow-distributing valve (9) of pin tooth cycloidal gear oil hydraulic pump provided by the invention can be a pintle, two annular grooves and two half circle groove are arranged on the pintle, two annular grooves communicate with liquid inlet pipe and drain pipe respectively, two half circle groove are on same annulus, do not communicate with each other, and respectively the chamber (11) of drawing of pump core is connected with one of two annular grooves, pintle and transmission shaft (1) coaxial line, the revolution of the rotation of pintle and internal rotor (2) is synchronous.
The flow-distributing valve (9) of pin tooth cycloidal gear oil hydraulic pump provided by the invention also can be a thrust plate, the semicircle annular distance that two different radiis are arranged on the thrust plate, the chamber (11) of drawing with the pump core is connected with one of liquid inlet pipe and drain pipe respectively, thrust plate and transmission shaft (1) coaxial line, the revolution of the rotation of thrust plate and internal rotor (2) is synchronous.
The advantage of pin tooth cycloidal gear oil hydraulic pump provided by the invention is:
A plurality of chambeies (11) of drawing are arranged, a part is the imbibition chamber, another part is an exhaust chamber, and suction liquid carries out simultaneously, along with the rotation of internal rotor (2) with hypocycloid wheel (4) line of centers, respectively drawing chamber (11) is progressive continuously by the process that imbibition changes discharge opeing (or discharge opeing changes imbibition over to) over to, and whenever there is one to draw chamber (11) and change discharge opeing over to, meanwhile, just has another and draw chamber (11) and change imbibition over to by discharge opeing by imbibition, whole process all hockets continuously, so the flow ripple disable;
Because the influence of flowed fluctuation to the oil liquid pressure stationarity eliminated in the flow ripple disable, help reducing oil liquid pressure and impact, reduce noise;
Each draw chamber (11) be the imbibition chamber be again the hydraulic fluid chamber, after liquid is inhaled into, be extruded away more on the spot, no handling process has reduced the loss of energy;
Pin tooth (3) also rotates, and makes it and inside and outside rotor (14) contact surface be bordering on pure rolling, and it is little to rub, wear and tear, and the mechanical efficiency loss is little, long service life;
When wearing and tearing take place in the pump core flank of tooth, need not change internal rotor (2) and hypocycloid wheel (4), only need to change pin tooth (3) and get final product, working service is convenient;
Curtate hypocycloid wheel (4) gear ring is than the easier processing of circle-arc tooth external rotor (14) gear ring of cycloid rotor pump;
Lifting rate is big, when internal rotor (2) was epicyclodial wheel, inside and outside two cycloid wheel meshed with pin tooth (3) simultaneously, in rotating process, the variable quantity that draws chamber (11) volume is big, so the lifting rate of revolution is more than 2 times of cycloid formula rotor pump that only have hypocycloid wheel (4) and pinwheel to mesh;
Because lifting rate increases, can reduce the volume of pump;
Less demanding to the liquid that is transferred.
Description of drawings:
Fig. 1 is the structural representation of the pin tooth cycloidal gear oil hydraulic pump of band pintle;
Fig. 2 is the pump cored structure schematic representation of pin tooth cycloidal gear oil hydraulic pump;
Fig. 3 is the structural representation of the pin tooth cycloidal gear oil hydraulic pump of band thrust plate;
Fig. 4 is the structural representation of the pin tooth cycloidal gear oil hydraulic pump of another kind of band pintle;
Fig. 5 is the structural representation of the pin tooth cycloidal gear oil hydraulic pump of another kind of band thrust plate;
Fig. 6 is the fundamental diagram of cycloid rotor pump.
Embodiment:
Embodiment 1:
A kind of pin tooth cycloidal gear oil hydraulic pump, its structure as shown in Figure 1.This oil hydraulic pump mainly is made up of transmission shaft (1), internal rotor (2), pin tooth (3), hypocycloid wheel (4), front cover (5), the pump housing (6), rear end cover (7), liquid entering hole (8), liquid outlet (10), pintle component such as (9).Transmission shaft (1) is an eccentric shaft, drives internal rotor (2) rotation; Internal rotor (2) is curtate epicycloid wheel or circle wheel; Pin tooth (3) is cam pin tooth (3), and eccentric rotary, the rotation axis fixed-site, and the spin axis that the rotation axis of pin tooth (3) is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis; Hypocycloid wheel (4) is the curtate hypocycloid gear ring, and internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric; Internal rotor (2), pin tooth (3), hypocycloid wheel (4) are formed a plurality of independently sealings and are drawn chamber (11) (as shown in Figure 2), these sealings draw chamber (11) be the imbibition chamber be again the hydraulic fluid chamber; Be provided with wear-resisting dish (12) between pintle (9) and internal rotor (2), pin tooth (3), the hypocycloid wheel (4).During work, transmission shaft (1) rotates, and drives internal rotor (2) and does planetary motion, and pin tooth (3) and hypocycloid wheel (4) are all done dead axle and rotated, and transmission shaft (1) overlaps with the rotational axis of hypocycloid wheel (4).Along with the rotation of internal rotor (2), hypocycloid wheel (4) and pin tooth (3), the volume that chamber (11) is drawn in each sealing changes, and carries out imbibition and discharge opeing.Pintle (9) makes each independently draw chamber (11) on the one hand and connects with liquid entering hole (8) and liquid outlet (10), is controlling the switching that each draws chamber (11) feed liquor and fluid on the one hand.
Embodiment 2:
A kind of pin tooth cycloidal gear oil hydraulic pump, its structure as shown in Figure 3.This oil hydraulic pump mainly is made up of transmission shaft (1), internal rotor (2), pin tooth (3), hypocycloid wheel (4), front cover, the pump housing (6), rear end cover (7), liquid entering hole (8), liquid outlet (10), thrust plate component such as (9).Transmission shaft (1) is an eccentric shaft, drives internal rotor (2) rotation; Internal rotor (2) is circle wheel or curtate epicycloid wheel; Pin tooth (3) is cam pin tooth (3), and eccentric rotary, the rotation axis fixed-site, and the spin axis that the rotation axis of pin tooth (3) is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis; Hypocycloid wheel (4) is the curtate hypocycloid gear ring, and internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric; Internal rotor (2), pin tooth (3), hypocycloid wheel (4) are formed a plurality of independently sealings and are drawn chamber (11) (as shown in Figure 2), these sealings draw chamber (11) be the imbibition chamber be again the hydraulic fluid chamber.During work, transmission shaft (1) rotates, and drives internal rotor (2) and does planetary motion, and pin tooth (3) and hypocycloid wheel (4) are all done dead axle and rotated, and transmission shaft (1) overlaps with the rotational axis of hypocycloid wheel (4).Along with the rotation of internal rotor (2), hypocycloid wheel (4) and pin tooth (3), the volume that chamber (11) is drawn in each sealing changes, and carries out imbibition and discharge opeing.Thrust plate (9) makes each independently draw chamber (11) on the one hand and connects with liquid entering hole (8) and liquid outlet (10), is controlling the switching that each draws chamber (11) feed liquor and fluid on the one hand.
Embodiment 3:
A kind of pin tooth cycloidal gear oil hydraulic pump, its structure as shown in Figure 4.This oil hydraulic pump mainly is made up of transmission shaft (1), internal rotor (2), pin tooth (3), hypocycloid wheel (4), front cover, the pump housing (6), rear end cover (7), liquid entering hole (8), liquid outlet (10), pintle component such as (9).Transmission shaft (1) connects firmly with hypocycloid wheel (4); Internal rotor (2) is curtate epicycloid wheel or disk; Pin tooth (3) is cam pin tooth (3), and eccentric rotary, and the rotation axis position is fixed, and the spin axis that the rotation axis of pin tooth (3) is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis; Hypocycloid wheel (4) is the curtate hypocycloid gear ring, and internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric; Internal rotor (2), pin tooth (3), hypocycloid wheel (4) are formed a plurality of independently sealings and are drawn chamber (11) (as shown in Figure 2), these sealings draw chamber (11) be the imbibition chamber be again the hydraulic fluid chamber.During work, transmission shaft (1) rotates, and drives hypocycloid wheel (4) and rotates, and pin tooth (3) rotates in fixed axis, and internal rotor (2) is done planetary motion, and rotates by eccentric shaft drive pintle (9).Along with the rotation of hypocycloid wheel (4), internal rotor (2) and pin tooth (3), the volume that chamber (11) is drawn in each sealing changes, and carries out imbibition and discharge opeing.Pintle (9) makes each independently draw chamber (11) on the one hand and connects with liquid entering hole (8) and liquid outlet (10), is controlling the switching that each draws chamber (11) feed liquor and fluid on the one hand.
Embodiment 4:
A kind of pin tooth cycloidal gear oil hydraulic pump, its structure as shown in Figure 5.This oil hydraulic pump mainly is made up of transmission shaft (1), internal rotor (2), pin tooth (3), hypocycloid wheel (4), front cover, the pump housing (6), rear end cover (7), liquid entering hole (8), oil outlet (10), thrust plate component such as (9).Transmission shaft (1) connects firmly with hypocycloid wheel (4); Internal rotor (2) is disk or curtate epicycloid wheel; Pin tooth (3) is cam pin tooth (3), and eccentric rotary, and the rotation axis position is fixed, and the spin axis that the rotation axis of pin tooth (3) is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis; Hypocycloid wheel (4) is the curtate hypocycloid gear ring, and internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric; Internal rotor (2), pin tooth (3), hypocycloid wheel (4) are formed a plurality of independently sealings and are drawn chamber (11) (as shown in Figure 2), these sealings draw chamber (11) be the imbibition chamber be again the hydraulic fluid chamber; Thrust plate (9) both sides are provided with wear-resisting dish (12).During work, transmission shaft (1) rotates, and drives hypocycloid wheel (4) and rotates, and pin tooth (3) rotates in fixed axis, and internal rotor (2) is done planetary motion, and rotates by eccentric shaft drive thrust plate (9).Along with the rotation of hypocycloid wheel (4), internal rotor (2) and pin tooth (3), the volume that chamber (11) is drawn in each sealing changes, and carries out imbibition and discharge opeing.Thrust plate makes each independently draw chamber (11) on the one hand and connects with liquid entering hole (8) and liquid outlet (10), is controlling the switching that each draws chamber (11) feed liquor and fluid on the one hand.

Claims (10)

1, a kind of pin tooth cycloidal gear oil hydraulic pump is equipped with transmission shaft (1), pump core, valve in the pump housing (6), and the pump core is by transmission shaft (1) driven rotary, and the chamber (11) of drawing of pump core links to each other with conveyance conduit by valve, it is characterized in that:
The pump core is a pin tooth cycloidal gear mechanism, is made up of internal rotor (2), pin tooth (3), hypocycloid wheel (4); Internal rotor (2) is provided with respect to hypocycloid wheel (4) is eccentric, with pin tooth (3) engagement, and pin tooth (3) and hypocycloid wheel (4) engagement, internal rotor (2), hypocycloid wheel (4) and every adjacent two pin teeth (3) all constitute one and draw chamber (11);
Wherein pin tooth (3) is cam pin tooth (3), the rotatingshaft fixed-site, and the spin axis that the axis of rotatingshaft is distributed in hypocycloid wheel (4) is on the cylndrical surface of axis.
2, according to the described pin tooth of claim 1 cycloidal gear oil hydraulic pump, it is characterized in that: described transmission shaft (1) drives internal rotor (2) or hypocycloid wheel (4) rotates.
3, according to claim 1 or 2 described pin tooth cycloidal gear oil hydraulic pumps, it is characterized in that: described internal rotor (2) is an epicyclodial wheel.
4, according to the described pin tooth of claim 3 cycloidal gear oil hydraulic pump, it is characterized in that: described valve is flow-distributing valve (9).
5, according to the described pin tooth of claim 4 cycloidal gear oil hydraulic pump, it is characterized in that: described flow-distributing valve (9) is a pintle, two annular grooves and two half circle groove are arranged on the pintle, two annular grooves communicate with liquid inlet pipe and drain pipe respectively, two half circle groove do not communicate with each other on same annulus, and respectively the chamber (11) of drawing of pump core are connected with one of two annular grooves, pintle and transmission shaft (1) coaxial line, the revolution of the rotation of pintle and internal rotor (2) is synchronous.
6, according to the described pin tooth of claim 4 cycloidal gear oil hydraulic pump, it is characterized in that: described flow-distributing valve (9) is a thrust plate, the semicircle annular distance that two different radiis are arranged on the thrust plate, the chamber (11) of drawing with the pump core is connected with one of liquid inlet pipe and drain pipe respectively, thrust plate and transmission shaft (1) coaxial line, the revolution of the rotation of thrust plate and internal rotor (2) is synchronous.
7, according to claim 1 or 2 described pin tooth cycloidal gear oil hydraulic pumps, it is characterized in that: described internal rotor (2) is the circle wheel.
8, according to the described pin tooth of claim 7 cycloidal gear oil hydraulic pump, it is characterized in that: described valve is flow-distributing valve (9).
9, according to the described pin tooth of claim 8 cycloidal gear oil hydraulic pump, it is characterized in that: described flow-distributing valve (9) is a pintle, two annular grooves and two half circle groove are arranged on the pintle, two annular grooves communicate with liquid inlet pipe and drain pipe respectively, two half circle groove do not communicate with each other on same annulus, and respectively the chamber (11) of drawing of pump core are connected with one of two annular grooves, pintle and transmission shaft (1) coaxial line, the revolution of the rotation of pintle and internal rotor (2) is synchronous.
10, according to the described pin tooth of claim 8 cycloidal gear oil hydraulic pump, it is characterized in that: described valve flow is a thrust plate, the semicircle annular distance that two different radiis are arranged on the thrust plate, the chamber (11) of drawing with the pump core is connected with one of liquid inlet pipe and drain pipe respectively, thrust plate and transmission shaft (1) coaxial line, the revolution of the rotation of thrust plate and internal rotor (2) is synchronous.
CNB2003101050739A 2003-11-11 2003-11-11 Cycloidal pin gear hydraulic pump Expired - Fee Related CN100357605C (en)

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Application Number Priority Date Filing Date Title
CNB2003101050739A CN100357605C (en) 2003-11-11 2003-11-11 Cycloidal pin gear hydraulic pump

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Application Number Priority Date Filing Date Title
CNB2003101050739A CN100357605C (en) 2003-11-11 2003-11-11 Cycloidal pin gear hydraulic pump

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CN100357605C true CN100357605C (en) 2007-12-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101608617B (en) * 2008-06-20 2012-07-25 安徽理工大学 Internally-geared low-pulsation gear pump

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GB2452493B (en) 2007-09-05 2012-05-23 Bamford Excavators Ltd Pumping apparatus
DE102008054753A1 (en) * 2008-12-16 2010-06-17 Robert Bosch Gmbh Internal gear pump
CN101560973B (en) * 2009-05-05 2010-12-01 上海师范大学 Double-cycloid rotor variable pump
CN101900110A (en) * 2010-07-30 2010-12-01 上海师范大学 Eccentric double-cycloid rotor pump
JP6271992B2 (en) 2013-12-13 2018-01-31 Ntn株式会社 Internal gear pump

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Publication number Priority date Publication date Assignee Title
CN2034205U (en) * 1987-08-13 1989-03-15 山东掖县粉末冶金总厂 Reversible cycloid engine oil pump
CN2270152Y (en) * 1996-11-21 1997-12-10 郎维环 Small cycloidal lubricating oil pump
CN2340947Y (en) * 1998-06-26 1999-09-29 南京金城机械有限公司 Small volume large flow oil pump
JP2001090749A (en) * 1999-07-30 2001-04-03 Dana Corp Fluid pressure type limited slip differential, and gerotor pump for differential
CN2538978Y (en) * 2002-04-25 2003-03-05 山东大学 Irregularly formed epicyclic rotor type oil pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2034205U (en) * 1987-08-13 1989-03-15 山东掖县粉末冶金总厂 Reversible cycloid engine oil pump
CN2270152Y (en) * 1996-11-21 1997-12-10 郎维环 Small cycloidal lubricating oil pump
CN2340947Y (en) * 1998-06-26 1999-09-29 南京金城机械有限公司 Small volume large flow oil pump
JP2001090749A (en) * 1999-07-30 2001-04-03 Dana Corp Fluid pressure type limited slip differential, and gerotor pump for differential
CN2538978Y (en) * 2002-04-25 2003-03-05 山东大学 Irregularly formed epicyclic rotor type oil pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101608617B (en) * 2008-06-20 2012-07-25 安徽理工大学 Internally-geared low-pulsation gear pump

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