CN100443742C - Hydraulic variable pump with four plunger and motor - Google Patents

Hydraulic variable pump with four plunger and motor Download PDF

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Publication number
CN100443742C
CN100443742C CNB2004100731037A CN200410073103A CN100443742C CN 100443742 C CN100443742 C CN 100443742C CN B2004100731037 A CNB2004100731037 A CN B2004100731037A CN 200410073103 A CN200410073103 A CN 200410073103A CN 100443742 C CN100443742 C CN 100443742C
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China
Prior art keywords
plunger
oil
hydraulic
oil circuit
transmission shaft
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CNB2004100731037A
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Chinese (zh)
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CN1746516A (en
Inventor
赵雪
陈�镛
王开华
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国营四七一厂
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Priority to CNB2004100731037A priority Critical patent/CN100443742C/en
Publication of CN1746516A publication Critical patent/CN1746516A/en
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Publication of CN100443742C publication Critical patent/CN100443742C/en

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Abstract

The present invention relates to a structure and the control of a plunger hydraulic variable displacement pump and a motor, particularly to a structure that the plunger hydraulic variable displacement pump or a plunger hydraulic variable displacement motor, which has the same structure, and the plunger hydraulic variable displacement pump or the plunger hydraulic variable displacement motor can be mutually replaced in a reverse direction. The plunger hydraulic variable displacement pump with four plungers, and the motor comprise plungers, plunger cylinders and a hydraulic oil distribution system, and are mainly characterized in that a reciprocating linear motion mechanism is connected between every two plungers, and the plungers can move in the plunger cylinders to and fro in a linear mode; oil paths of the plunger cylinders are respectively provided with two three-way hydraulic systems. The present invention has the advantages of simple structure, reasonable design and capacity of realizing automatic grading and speed regulation.

Description

Hydraulic variable pump with four plunger

Technical field:

The present invention relates to plunger hydraulic variable pump structure and control, relate in particular to the plunger hydraulic variable pump structure of identical in structure reverse replacement each other.

Background technique:

The variable mode of plunger hydraulic variable displacement pump all adopts and changes plunger stroke and realize in the prior art, and as swash plate plunger pump or bent axis type axial piston pump, pump structure complexity, manufacture difficulty are big.When the suction extrusion link volume of pump can not change, the output discharge capacity of pump can not change.Application number is 03134567.0, and name is called the application for a patent for invention of " a kind of double-action four plunger hydraulic pumps ", discloses a kind of new structure, but only relate to four plunger hydraulic pumps, though its capacity can change, variable quantity is less, and irreversible to, use as motor.Application number is 03134569.7; name is called the application for a patent for invention of " a kind of hydraulic pump with planetary gear and plunger "; a kind of new structure is disclosed again; also only relate to four plungers, six plunger hydraulic pumps; though its capacity can change; but classification is wide, variable quantity is less, can only realize overload protection, and can not really realize speed governing.And irreversible to, use as motor.

Summary of the invention:

The objective of the invention is to avoid the deficiencies in the prior art part and a kind of hydraulic variable pump with four plunger is provided.

Purpose of the present invention can be by realizing by the following technical solutions: a kind of hydraulic variable pump with four plunger, include four plungers (6a, 6b, 6c, 6d), four plunger cases (4a, 4b, 4c, 4d) and said hydraulic oil distribution system, its main feature is also to include between first plunger (6a) and second plunger (6b) and the 3rd plunger (6c) and the 4th plunger (6d) to be connected with linear reciprocating motion mechanism, and four plungers (6a, 6b, 6c, 6d) can do reciprocating linear motion in four plunger cases (4a, 4b, 4c, 4d) of correspondence; Be respectively equipped with the two-position three-way valve hydraulic system on the middle oil circuit of four plunger cases (4a, 4b, 4c, 4d), described linear reciprocating motion mechanism comprises said hydraulic oil distribution system transmission shaft (1) driving gear (10) that is connected, driven gear (9) engagement on driving gear (10) and the crank throw transmission shaft (13), driving gear (10) is 1: 1 with the gear ratio of driven gear (9).Two planetary pinion (8a, 8b) sky is enclosed within extended two the epicyclic train tie-rod (12a of crank throw transmission shaft (13) respectively, two bearing pin (14a 12b), 14b), two public crank throw transmission shafts of planetary tie-rod (13), two planetary pinion (8a, 8b) with two fixing internal gear (7a, 7b) corresponding engagement, at two planetary pinion (8a, be respectively equipped with the first push rod bearing pin (15a) and the second push rod bearing pin (15b) on end face 8b), with two push rod bearing pin (15a, 15b) two push rod (16a of corresponding empty cover, 16b) with four plunger (6a, 6b, 6c, 6d) the corresponding connection, two planetary pinion (8a, 8b) by two corresponding push rod bearing pin (15a, 15b) drive plunger and in plunger case, do straight reciprocating motion, in its epicyclic train, two planetary pinion (8a, 8b) with corresponding fixing internal gear (7a, 7b) gear ratio is 1: 2.It is 90 ° that phase difference is arranged between the established angle of described two epicyclic train tie-rods (12a, 12b).

Described hydraulic variable pump with four plunger the two-position three-way valve hydraulic system include and on the oil circuit of four plunger cases (4a, 4b, 4c, 4d), respectively be serially connected with a two-bit triplet solenoid valve (5 a, 5 b, 5 c, 5 d); Valve (5 a, 5 b, 5 c, 5 d) during dead electricity, the middle oil circuit (a on four plunger cases (4a, 4b, 4c, 4d) 1, a 2, a 3, a 4) corresponding with join oil circuit (b 1, b 2, b 3, b 4) be communicated with; When valve (5 a, 5 b, 5 c, 5 d) when electric, the middle oil circuit (a on corresponding four plunger cases (4a, 4b, 4c, 4d) then 1, a 2, a 3, a 4) communicate with inlet port (O ').

The said hydraulic oil distribution system of described hydraulic variable pump with four plunger is made up of said hydraulic oil distribution system transmission shaft (1) last coaxial rotating sleeve of adorning (2) and fixed cover (3), at fixed cover (3) and press between the hydraulic fluid port (P ') and be provided with accumulator (11), on fixed cover (3), be provided with oil-collecting hole and join oil circuit and be communicated with; Correspondence joins oil circuit (b when the plunger oil suction 1, b 2) communicate with inlet port (O '), correspondence joins oil circuit (b when plunger is pressed oil 1, b 2) communicate with pressing hydraulic fluid port (P '), realize unloading stream, by logic control a two-bit triplet solenoid valve is got when electric, the output discharge capacity reduces 1/4th, when make four two-bit triplet solenoid valves all when electric, the output discharge capacity is zero, keeps delivery pressure and fuel feeding by accumulator.

The present invention is during as four plunger hydraulic variable displacement motors, and described inlet port (O ') can be made as oil drain out, presses hydraulic fluid port (P ') can be made as the pressure oil inlet opening.Under the pressure oil effect, make the straight reciprocating motion of plunger in plunger case promote planetary pinion and in internal gear, revolve round the sun, this revolution motion has been realized the rotation of planetary pinion tie-rod.Two common crank throw transmission shafts (13) that drive of planetary tie-rod, by a pair of gear the power of crank throw transmission shaft (13) is synthesized on the output said hydraulic oil distribution system transmission shaft (1), join oil system and form by driving on the take-off (propeller) shaft the coaxial rotating sleeve of adorning and fixed cover, what be used for when plunger oil suction correspondence joins oil circuit (b 1), (b 2), (b 3), (b 4) communicate with pressure oil inlet opening (P '), correspondence joins oil circuit (b when the plunger oil extraction 1), (b 2), (b 3), (b 4) communicate with oil drain out (O ').The two-bit triplet solenoid valve (5 of serial connection a), (5 b), (5 c), (5 d), when valve (5 a), (5 b), (5 c), (5 d) during dead electricity, make oil circuit (a in the middle of each on the plunger case 1), (a 2), (a 3), (a 4) corresponding with join oil circuit (b 1), (b 2), (b 3), (b 4) communicate, when valve (5 a), (5 b), (5 c), (5 d) when electric; corresponding plunger case oil circuit and oil drain out (O ') are communicated; then corresponding oil cylinder unloads stream; by logic control a two-bit triplet solenoid valve is got when electric; the input discharge capacity reduces 1/4th; output speed improves 1.3 times; when three two-bit triplet solenoid valves are got when electric; the input discharge capacity reduces 3/4ths, and output speed improves 4 times, when make four two-bit triplet solenoid valves all when electric; the input discharge capacity is zero; motor shutdown, the accumulator in the oil circuit is used to reduce pressure pulsation, stablizes the motor output speed.

In described structure, when external force is rotated rotatingshaft (1),,, realize the effect of oil hydraulic pump pressing hydraulic fluid port (P ') just to export pressure oil with pressure by inlet port (O ') oil suction; When pressing hydraulic fluid port (P ') when feeding pressure oil, by inlet port (O ') oil return, transmission shaft (1) has just produced and has rotatablely moved, and realizes the effect of oil hydraulic motor.

The invention has the beneficial effects as follows, simple in structure, reasonable in design, can realize automatic step-governor d.

Description of drawings:

Fig. 1 is the hydraulic variable pump with four plunger structure diagram;

Fig. 2 is four plunger hydraulic variable displacement motor structure diagrams;

The principle schematic that a bit (push rod) on Fig. 3 planetary pinion does reciprocating linear motion.

Embodiment:

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:

See Fig. 1, hydraulic variable pump with four plunger has four plunger 6a, 6b, 6c, 6d, and four plunger case 4a, 4b, 4c, 4d and said hydraulic oil distribution system are serially connected with two-bit triplet solenoid valve 5 respectively on the middle oil circuit of four plunger case 4a, 4b, 4c, 4d a, 5 b, 5 c, 5 d, valve 5 a, 5 b, 5 c, 5 dDuring dead electricity, the middle oil circuit a on four plunger case 4a, 4b, 4c, the 4d 1, a 2, a 3, a 4Corresponding with join oil circuit b 1, b 2, b 3, b 4Be communicated with; When valve 5 a, 5 b, 5 c, 5 dWhen electric, the middle oil circuit a on then corresponding four plunger case 4a, 4b, 4c, the 4d 1, a 2, a 3, a 4O ' communicates with inlet port.Be connected with linear reciprocating motion mechanism between the first plunger 6a and the second plunger 6b, the 3rd plunger 6c and the 4th plunger 6d, four plunger 6a, 6b, 6c, 6d can do reciprocating linear motion in four plunger case 4a, 4b of correspondence, 4c, 4d; Linear reciprocating motion mechanism is linked to each other with epicyclic train crank throw transmission shaft 13 by gear 9,10 by said hydraulic oil distribution system transmission shaft 1, driving gear 10 on the said hydraulic oil distribution system transmission shaft 1 and 9 engagements of the gear on the crank throw transmission shaft 13, gear 10 is 1: 1 with the gear ratio of gear 9.Two planetary pinion 8a, 8b skies are enclosed within on two bearing pin 14a, the 14b of crank throw transmission shaft 13 extended two epicyclic train tie-rod 12a, 12b, two public crank throw transmission shafts 13 of planetary tie-rod, two planetary pinion 8a, 8b and corresponding fixed annulus 7a, 7b engagement, correspondence is provided with push rod bearing pin 15a, 15b respectively on the end face of two planetary pinion 8a, 8b, is connected with four plunger 6a, 6b, 6c, 6d with push rod 16a, the 16b of the empty cover of push rod bearing pin 15a, 15b.Planetary pinion drives plunger by push rod bearing pin 15a, 15b and do straight reciprocating motion in plunger case, and in its epicyclic train, planetary pinion 8a, 8b and internal gear 7a, the 7b gear ratio fixed are 1: 2.Phase difference between between the established angle of two epicyclic train tie-rod 12a, 12b is 90 °.Hydraulic variable pump with four plunger and motor are provided with accumulator 11 between fixed cover 3 and pressure hydraulic fluid port P '.Said hydraulic oil distribution system is made up of coaxial rotating sleeve of adorning 2 and fixed cover 3 on the said hydraulic oil distribution system transmission shaft 1, is provided with oil-collecting hole and joins oily oil circuit and be communicated with on fixed cover 3; Correspondence joins oil circuit b when the plunger oil suction 1, b 2O ' communicates with inlet port, and correspondence joins oily oil circuit b when plunger is pressed oil 1, b 2Communicate with pressing hydraulic fluid port P ', by logic control a two-bit triplet solenoid valve is got when electric, the output discharge capacity reduces 1/4th, when make four two-bit triplet solenoid valves all when electric, the output discharge capacity is zero, keeps delivery pressure and fuel feeding by accumulator 11.

During use, said hydraulic oil distribution system transmission shaft 1 rotates under motor driving, drive input hydraulic pressure and join driven gear 9 engagement driving that are connected on the driving gear 10 that is connected on the oil system transmission shaft 1 and the crank throw transmission shaft 13, two public crank throw transmission shafts 13 of planetary tie-rod, by a pair of gear power is joined oil system transmission shaft 1 from input hydraulic pressure and import public crank throw transmission shaft 13 into, drive two planetary tie-rods and rotate, make four plungers 6 by epicyclic train a, 6 b, 6 c, 6 dCan be at four plunger cases 4 a, 4 b, 4 c, 4 dIn do straight reciprocating motion, inhale and press the oil action; Correspondence joins oil circuit b when the plunger oil suction 1, b 2, b 3, b 4O ' communicates with inlet port, and correspondence joins oily oil circuit b when plunger is pressed oil 1, b 2, b 3, b 4Communicate with pressing hydraulic fluid port P '.The two-bit triplet solenoid valve 5 of serial connection a, 5 b, 5 c, 5 dRealize off-load and unload stream, valve 5 a, 5 b, 5 c, 5 dDuring dead electricity, make each the middle oil circuit a on the plunger case 1, a 2, a 3, a 4Corresponding with join oil circuit b 1, b 2, b 3, b 4Communicate, when valve 5 a, 5 b, 5 c, 5 dWhen electric, corresponding plunger case oil circuit is communicated with inlet port O ', by logic control a two-bit triplet solenoid valve is got when electric, the output discharge capacity reduces 1/4th, when make four two-bit triplet solenoid valves all when electric, the output discharge capacity is zero, keeps delivery pressure and fuel feeding by accumulator 11.

See Fig. 2, the present invention is during as four plunger hydraulic variable displacement motors, and described inlet port O ' can be made as oil drain out, presses hydraulic fluid port P ' can be made as the pressure oil inlet opening.Under the pressure oil effect, make the straight reciprocating motion of plunger in plunger case promote planetary pinion and in internal gear, revolve round the sun, this revolution motion has been realized the rotation of planetary pinion tie-rod.Crank throw transmission shaft 13 of two common drivings of planetary tie-rod, by a pair of gear the power of crank throw transmission shaft 13 is synthesized on the output said hydraulic oil distribution system transmission shaft 1, join oil system and form, be used for the oily oil circuit b that joins of when plunger oil suction correspondence by driving on the take-off (propeller) shaft the coaxial rotating sleeve of adorning and fixed cover 1, b 2, b 3, b 4P ' communicates with the pressure oil inlet opening, and correspondence joins oil circuit b when the plunger oil extraction 1, b 2, b 3, b 4O ' communicates with oil drain out.The two-bit triplet solenoid valve 5 of serial connection a, 5 b, 5 c, 5 d, when valve 5 a, 5 b, 5 c, 5 dDuring dead electricity, make each the middle oil circuit a on the plunger case 1, a 2, a 3, a 4Corresponding with join oil circuit b 1, b 2, b 3, b 4Communicate, when valve 5 a, 5 b, 5 c, 5 dWhen electric; corresponding plunger case oil circuit is communicated with oil drain out O '; then corresponding oil cylinder unloads stream; by logic control a two-bit triplet solenoid valve is got when electric; the input discharge capacity reduces 1/4th; output speed improves 1.3 times; when three two-bit triplet solenoid valves are got when electric; the input discharge capacity reduces 3/4ths, and output speed improves 4 times, when make four two-bit triplet solenoid valves all when electric; the input discharge capacity is zero; motor shutdown, the accumulator in the oil circuit is used to reduce pressure pulsation, stablizes the motor output speed.

See Fig. 3, the principle schematic that a bit (the push rod bearing pin) on the planetary pinion does reciprocating linear motion.

Realize that by epicyclic train rotation becomes the argument reasoning of straight reciprocating motion conversion: according to condition, the tooth number Z of planetary pinion 8 1Tooth number Z with internal gear 7 2Ratio is Z 1: Z 2=1: 2, as shown in Figure 3, beginning two gears is some O on the planet pitch circle in the H point gearing 3(push rod bearing pin 15).When epicyclic train tie-rod 12 turned over a angle, contact points moved to N from H, and corresponding pure rolling arc length is respectively S HNWith S O3N, and S HN=S O3N, by the gear ratio relation as can be known, S O3NCorresponding central angle b=2*a makes the angular bisector MO of angle b 2With make HO 1Vertical line PO 2, O is then arranged 3N=2MN, Δ O 1O 2P and Δ O 2NM congruence, i.e. O 3N=PO 2+ MN.Explanation thus, O 3Point is at HO 1Straight line on.

When epicyclic train tie-rod 12 around O 1One week, some O 3(push rod bearing pin 15) is at the diameter HH of internal gear 7 1Linear reciprocating motion of last work promptly drives plunger 6a, 6b and make one time linear reciprocating motion in plunger case 4a, 4b.

Claims (8)

1. hydraulic variable pump with four plunger, include four plungers (6a, 6b, 6c, 6d), four plunger cases (4a, 4b, 4c, 4d) and said hydraulic oil distribution system, it is characterized in that also including between first plunger (6a) and second plunger (6b) and the 3rd plunger (6c) and the 4th plunger (6d) and be connected with linear reciprocating motion mechanism; Four plunger case (4a, 4b, 4c, be respectively equipped with the two-position three-way valve hydraulic system on middle oil circuit 4d), described linear reciprocating motion mechanism comprises said hydraulic oil distribution system transmission shaft (1) driving gear (10) that is connected, driven gear (9) engagement on driving gear (10) and the crank throw transmission shaft (13), two planetary pinion (8a, 8b) sky is enclosed within extended two the epicyclic train tie-rod (12a of crank throw transmission shaft (13) respectively, two bearing pin (14a 12b), 14b), two planetary pinion (8a, 8b) with two fixing internal gear (7a, 7b) corresponding engagement, at two planetary pinion (8a, be respectively equipped with the first push rod bearing pin (15a) and the second push rod bearing pin (15b) on end face 8b), with two push rod bearing pin (15a, 15b) two push rod (16a of corresponding empty cover, 16b) with four plunger (6a, 6b, 6c, 6d) corresponding connection, described two epicyclic train tie-rod (12a, it is 90 ° that phase difference is arranged between established angle 12b).
2. hydraulic variable pump with four plunger as claimed in claim 1 is characterized in that described two-position three-way valve hydraulic system includes respectively to be serially connected with a two-bit triplet solenoid valve (5 on the oil circuit of four plunger cases (4a, 4b, 4c, 4d) a, 5 b, 5 c, 5 d); Valve (5 a, 5 b, 5 c, 5 d) during dead electricity, the middle oil circuit (a on four plunger cases (4a, 4b, 4c, 4d) of its correspondence 1, a 2, a 3, a 4) corresponding with join oil circuit (b 1, b 2, b 3, b 4) be communicated with; When valve (5 a, 5 b, 5 c, 5 d) when electric, the middle oil circuit (a on corresponding four plunger cases (4a, 4b, 4c, 4d) then 1, a 2, a 3, a 4) communicate with inlet port (O ').
3. hydraulic variable pump with four plunger as claimed in claim 1 is characterized in that described two planetary pinions (8a, 8b) are 1: 2 with corresponding fixing two internal gears (7a, 7b) gear ratio.
4. hydraulic variable pump with four plunger as claimed in claim 1, it is characterized in that described said hydraulic oil distribution system is made up of said hydraulic oil distribution system transmission shaft (1) last coaxial rotating sleeve of adorning (2) and fixed cover (3), on fixed cover (3), be provided with oil-collecting hole and join oily oil circuit and be communicated with; Correspondence joins oil circuit (b when the plunger oil suction 1, b 2) communicate with inlet port (0 '), correspondence joins oil circuit (b when plunger is pressed oil 1, b 2) communicate with pressing hydraulic fluid port (P ').
5. hydraulic variable pump with four plunger as claimed in claim 4 is characterized in that also including at fixed cover (3) and presses between the hydraulic fluid port (P ') and is provided with accumulator (11).
6. plunger hydraulic variable displacement motor, include four plungers (6a, 6b, 6c, 6d), four plunger cases (4a, 4b, 4c, 4d) and said hydraulic oil distribution system, it is characterized in that also including between first plunger (6a) and second plunger (6b) and the 3rd plunger (6c) and the 4th plunger (6d) and be connected with linear reciprocating motion mechanism; Four plunger case (4a, 4b, 4c, be respectively equipped with the two-position three-way valve hydraulic system on middle oil circuit 4d), described linear reciprocating motion mechanism comprises said hydraulic oil distribution system transmission shaft (1) driving gear (10) that is connected, driven gear (9) engagement on driving gear (10) and the crank throw transmission shaft (13), two planetary pinion (8a, 8b) sky is enclosed within extended two the epicyclic train tie-rod (12a of crank throw transmission shaft (13) respectively, two bearing pin (14a 12b), 14b), two planetary pinion (8a, 8b) with two fixing internal gear (7a, be corresponding engagement in 1: 2 7b) with gear ratio, at two planetary pinion (8a, be respectively equipped with the first push rod bearing pin (15a) and the second push rod bearing pin (15b) on end face 8b), with two push rod bearing pin (15a, 15b) two push rod (16a of corresponding empty cover, 16b) with four plunger (6a, 6b, 6c, 6d) corresponding connection, described two epicyclic train tie-rod (12a, it is 90 ° that phase difference is arranged between established angle 12b).
7. four plunger hydraulic variable displacement motors as claimed in claim 6 is characterized in that described two-position three-way valve hydraulic system includes respectively to be serially connected with a two-bit triplet solenoid valve (5 on the oil circuit of four plunger cases (4a, 4b, 4c, 4d) a, 5 b, 5 c, 5 d); Valve (5 a, 5 b, 5 c, 5 d) during dead electricity, the middle oil circuit (a on four plunger cases (4a, 4b, 4c, 4d) of its correspondence 1, a 2, a 3, a 4) corresponding with join oil circuit (b 1, b 2, b 3, b 4) be communicated with; When valve (5 a, 5 b, 5 c, 5 d) when electric, the middle oil circuit (a on corresponding four plunger cases (4a, 4b, 4c, 4d) then 1, a 2, a 3, a 4) communicate with oil drain out (O ').
8. four plunger hydraulic variable displacement motors as claimed in claim 6, it is characterized in that described said hydraulic oil distribution system is made up of said hydraulic oil distribution system transmission shaft (1) last coaxial rotating sleeve of adorning (2) and fixed cover (3), on fixed cover (3), be provided with oil-collecting hole and join oil circuit and be communicated with, be provided with accumulator (11) between fixed cover (3) and pressure oil inlet opening (P '); Correspondence joins oil circuit (b when the plunger oil suction 1, b 2) communicate with pressure oil inlet opening (P '), correspondence joins oil circuit (b when plunger is pressed oil 1, b 2) communicate with oil drain out (O ').
CNB2004100731037A 2004-09-09 2004-09-09 Hydraulic variable pump with four plunger and motor CN100443742C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2004100731037A CN100443742C (en) 2004-09-09 2004-09-09 Hydraulic variable pump with four plunger and motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2004100731037A CN100443742C (en) 2004-09-09 2004-09-09 Hydraulic variable pump with four plunger and motor

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CN1746516A CN1746516A (en) 2006-03-15
CN100443742C true CN100443742C (en) 2008-12-17

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109281877B (en) * 2018-12-12 2019-08-23 燕山大学 A kind of high pressure accumulator and its control method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531898A (en) * 1983-12-13 1985-07-30 Nissan Motor Co., Ltd. Control system for a vane type variable displacement pump
JPH10231801A (en) * 1997-02-19 1998-09-02 Kayaba Ind Co Ltd Load sensing circuit
CN1401894A (en) * 2002-09-13 2003-03-12 甘肃工业大学 Double-acting four-plunger hydraulic pump or motor
CN1410668A (en) * 2002-09-13 2003-04-16 甘肃工业大学 Double action biram hydraulic driving motor
CN1590760A (en) * 2003-08-26 2005-03-09 兰州理工大学 Biaction four plunger hydraulic pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531898A (en) * 1983-12-13 1985-07-30 Nissan Motor Co., Ltd. Control system for a vane type variable displacement pump
JPH10231801A (en) * 1997-02-19 1998-09-02 Kayaba Ind Co Ltd Load sensing circuit
CN1401894A (en) * 2002-09-13 2003-03-12 甘肃工业大学 Double-acting four-plunger hydraulic pump or motor
CN1410668A (en) * 2002-09-13 2003-04-16 甘肃工业大学 Double action biram hydraulic driving motor
CN1590760A (en) * 2003-08-26 2005-03-09 兰州理工大学 Biaction four plunger hydraulic pump

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Granted publication date: 20081217