CN101225816B - Transfiguration piston pump - Google Patents
Transfiguration piston pump Download PDFInfo
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- CN101225816B CN101225816B CN2008100136716A CN200810013671A CN101225816B CN 101225816 B CN101225816 B CN 101225816B CN 2008100136716 A CN2008100136716 A CN 2008100136716A CN 200810013671 A CN200810013671 A CN 200810013671A CN 101225816 B CN101225816 B CN 101225816B
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- end cap
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- dividing plate
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- 239000007788 liquid Substances 0.000 claims abstract description 33
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000033001 locomotion Effects 0.000 description 18
- 238000005213 imbibition Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a variable volume piston pump, which is characterized in that: the liquid flow can realize a stepless change through a simple structure improvement and changing the effective compression area. The variable volume piston pump has the advantages of simple structure, and is suitable for popularization and application.
Description
Technical field
The present invention relates to the technical field of hydraulic power system in the machinery, specifically, is a kind of transfiguration piston pump of new structure.
Background technique
Existing oil hydraulic pump or equipment for liquid transportation can not make liquid output (or input) flow G=c (c is a constant) mostly, though rotary-piston can solve problem in this respect, but structure is complicated, movable part is many, and alternately the pair of pistons of acting exists the step of G from 0 to c to change, the be under pressure test of step response of the pressure-bearing boundary of device.Openly application for a patent for invention (200710013707.6) has proposed a kind ofly can make flow G
AlwaysThe method of=c (c is a constant) but can't solve and make G
AlwaysThe problem of stepless variation.
The friction wheel through-put power that the rubber like elastic material is made is little, and friction wheel can sustain damage in the process of transmission; The transmission of steel-belt type is subjected to the restriction of steel band intensity bigger.And, change relatively difficulty by changing rotating speed if want to change the flow of oil hydraulic pump.
Need a kind of novel reciprocating pump mechanism badly, can realize the controlled stepless variation of flow, thereby address the above problem.
Summary of the invention
The invention provides a kind of transfiguration piston pump, it can solve the problem that fluid flow that prior art exists can not be realized stepless variation.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of transfiguration piston pump is characterized in that: comprise a cylinder body, described cylinder body is the cylinder with inner chamber;
A connecting rod, described connecting rod are arranged in described inner chamber of cylinder block and pass from the cylinder body two ends respectively, and described connecting rod is cylindrical body and is parallel to described inboard wall of cylinder block;
A piston, described piston are positioned at described cylinder body and fixedly connected with described connecting rod;
An end cap, described end cap are connected described cylinder body bottom surface and can relatively rotate with described cylinder body, and described end cap and described cylinder body serve as that axle relatively rotates with described connecting rod;
A dividing plate, be arranged at described piston bottom, described dividing plate passes described end cap, described dividing plate and described end bracket enclosed are slidingly connected, described dividing plate is divided into two variable volume chambers with the inner chamber of cylinder block of piston bottom, the junction plane sealed sliding of described dividing plate and described connecting rod movingly, simultaneously with the junction plane sealed sliding of described inboard wall of cylinder block movingly, the junction plane sealed sliding of described dividing plate top and described piston is movingly;
A dish seat is connected with described connecting rod bottom, and described dish seat upper surface and described dividing plate are slidingly matched;
Respectively be provided with a liquid hole on the cylinder wall of the variable volume chamber correspondence in the described cylinder body.
In technological scheme of the present invention, also have following technical characteristics: described end cap is that rotary seal cooperates with described cylinder body bottom, is fastened by snap ring.
In technological scheme of the present invention, also have following technical characteristics: end periphery is provided with the cylinder body flange under the described cylinder body, end periphery is provided with the end cap flange on the described end cap, described cylinder body flange docks with described end cap flange, on the cylinder body flange that described snap ring is installed on described butt joint and the end cap flange described cylinder body is connected with described end cap.
In technological scheme of the present invention, also have following technical characteristics: described snap ring is two semi-circle bodies, its inner side surface has and described cylinder body flange that docks and end cap flange corresponding groove, end at each sheet semi-circle body has screw, described snap ring is connected as a single entity by connecting plate, has screw on the described connecting plate.
In technological scheme of the present invention, also have following technical characteristics: described piston is the fan toroid; Described fan toroid is meant the part of ring.
In technological scheme of the present invention, also have following technical characteristics: the cross section of described dividing plate is the fan toroid.
In technological scheme of the present invention, also have following technical characteristics: described end cap is provided with handle.
Compared with prior art, advantage of the present invention and good effect are as follows: transfiguration piston pump of the present invention by changing effective compressing area of piston, makes fluid flow realize stepless variation through simple architecture advances.The present invention is simple in structure, suitable applying.
Description of drawings
Fig. 1 is an overall structure schematic representation of the present invention;
Fig. 2 is the integrally-built partial sectional view of the present invention;
Fig. 3 is the cross sectional representation of cylinder body;
Fig. 4 is the plan view of piston and connecting rod;
Fig. 5 is connecting rod and dividing plate plan view;
Fig. 6 is cylinder body and end cap connection diagram;
Fig. 7 is that cylinder body is connected partial sectional view with end cap;
Fig. 8 is the work schematic representation of single transfiguration piston pump;
Fig. 9 is the user mode schematic representation of transfiguration piston pump of the present invention;
Wherein:
1, cylinder body; 1-1, inboard wall of cylinder block; 1-2, inner chamber of cylinder block; 1-3, liquid hole; 1-4, variable volume chamber; 1-5, cylinder body flange;
2, piston;
3, connecting rod;
4, dividing plate;
5, end cap; 5-1, end cap flange; 5-2, handle;
6, dish seat;
7, snap ring; 7-1, screw; 7-2, snap ring connecting plate; 7-3, groove;
10, transfiguration piston pump;
11, safety check; 12, safety check;
13, liquid case; 14, liquid case; 15, load; 16, liquid case; 17, pipeline; 18, transfiguration valve;
20, load system; 30, balanced system; 40, drive unit;
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Be a kind of transfiguration piston pump 10 as depicted in figs. 1 and 2, comprise:
A cylinder body 1, described cylinder body 1 is for to have the cylinder of inner chamber 1-2, and its cross section is as shown in Figure 3;
A piston 2, described piston 2 are positioned at described cylinder body 1 and fixedly connected with described connecting rod 3, and described piston 2 is positioned at the central authorities of described connecting rod 3;
A connecting rod 3, described connecting rod 3 are arranged in described inner chamber of cylinder block 1-2 and pass from cylinder body 1 two ends respectively, and described connecting rod 3 is for cylindrical body and be parallel to described inboard wall of cylinder block 1-1;
An end cap 5, described end cap 5 are connected described cylinder body 1 bottom surface and can relatively rotate with described cylinder body 1, and described end cap 5 serves as that axle relatively rotates with described cylinder body 1 with described connecting rod 3, and described end cap 5 is provided with handle 5-2.
A dividing plate 4, be arranged at described piston 2 bottoms, described dividing plate 4 passes described end cap 5, described dividing plate 4 is slidingly connected with described end cap 5 sealings, described dividing plate 4 is divided into two variable volume chamber 1-4 with the inner chamber of cylinder block 1-2 of piston 2 bottoms, the junction plane sealed sliding of described dividing plate 4 and described connecting rod 3 movingly, simultaneously the junction plane sealed sliding of dividing plate 4 and described inboard wall of cylinder block 1-1 movingly, the junction plane sealed sliding of described dividing plate 4 tops and described piston 2 is movingly;
A dish seat 6 is connected with described connecting rod 3 bottoms, and described dish seat 6 upper surfaces and described dividing plate 4 are slidingly matched;
Fig. 3 is the cross sectional representation of cylinder body 1, and visible inboard wall of cylinder block 1-1 is divided into two-part, is respectively piston chute and connecting rod chute, is smooth surface, and piston chute and connecting rod chute be the cylndrical surface, and for convenience of description, plan view all adopts semicircle.
The piston chute is the guiding groove that piston 2 is in axial sliding, and the connecting rod chute is the guiding groove that connecting rod 3 is in axial sliding.
Being illustrated in figure 4 as piston 2 and connecting rod 3 combination plan views, is fixedly connected between piston 2 and the connecting rod 3, no relative movement.
Described piston 2 plan views are the fan toroid, and whole the upper surface of piston 2 is not done requirement in order to fan ring cylinder, and bottom surface and side are the smooth seal face, and the axis of bottom surface vertical links 3;
Connecting rod 3 is an elongated cylinder, and side and bottom surface are smooth surface.
Piston 2 is identical with inboard wall of cylinder block 1-1 plan view shape with connecting rod 3 combination plan views.
Combine for smooth seal between piston 2 and the piston chute;
Combine for smooth seal between connecting rod 3 and the connecting rod chute.
Fig. 5 is connecting rod 3 and dividing plate 4 plan views, and dividing plate 4 is a positive cylinder, and the bottom surface is the fan toroid, and described fan toroid is meant the part of ring.6 faces of dividing plate 4 are smooth surface, and two wherein relative sides are the cylndrical surface, and cylndrical surface and connecting rod 3 side seals are slidingly connected, and another cylndrical surface and inboard wall of cylinder block 1-1 sealing are slidingly connected.
Dividing plate 4 upper bottom surfaces and piston 2 bottom surfaces are slidingly connected for sealing.
As shown in Figure 6, described end cap 5 is a smooth surface with the surface of contact of described cylinder body 1 bottom surface, be each other sealed sliding movingly, be fastened by snap ring 7.1 time end periphery of described cylinder body is provided with cylinder body flange 1-5, end periphery is provided with end cap flange 5-1 on the described end cap 5, described cylinder body flange 1-5 docks with described end cap flange 5-1, described snap ring 7 is installed on the cylinder body flange 1-5 and end cap flange 5-1 of described butt joint, and described cylinder body 1 is connected with described end cap 5.
As shown in Figure 7, described snap ring 7 is two semi-circle bodies, its inner side surface has the groove 7-3 that is complementary with described cylinder body flange 1-5 that docks and end cap flange 5-1 shape, have laterally zygomorphic two screw 7-1 in an end of each sheet semi-circle body, a slice semi-circle body has 4 screw 7-1 altogether.Described snap ring 7 is connected as a single entity by 4 snap ring connecting plate 7-2, has screw 7-1 on the described snap ring connecting plate 7-2.
As mentioned above, cylinder body 1, piston 2, connecting rod 3, dividing plate 4, end cap 5 are divided into two isolated mutually variable volume chamber 1-4 with the inner chamber of cylinder block 1-2 in the cylinder body 1, and each variable volume chamber 1-4 has a liquid hole 1-3.By handle 5-2 rotary end cover 5, can drive dividing plate 4 and rotate, thereby change the volume of two variable volume chamber 1-4 and effective compressing area that piston 2 belongs to two variable volume chamber 1-4.
Working principle:
Openly the piston pump driving mechanism in the application for a patent for invention 200710013707.6 can be by driving 4 of press the certain way combination (or 8,12 etc.) reciprocating pump realization flow G
Always=c (c is a constant).
As shown in Figure 9, above-mentioned four reciprocating pumps are replaced with transfiguration piston pump 10 of the present invention, now with one group 4 (also can be 8 or 12) transfiguration piston pumps 10 of the present invention, differ the arrangement of four/one-period by piston 2, concrete mounting type is seen openly application for a patent for invention 200710013707.6, four transfiguration piston pumps 10 of the present invention promptly vertically are installed, its model is identical, piston 2 positions of initial time differ for four/one-period successively, and dividing plate 4 corners are identical, and the dividing plate 4 of 4 transfiguration piston pumps 10 of the present invention is rotated synchronously.
In one group of 4 transfiguration piston pump 10,4 variable volume chamber 1-4 that have load 15 form load system 20 with relevant pipeline, safety check, liquid case 13,14.
In one group of 4 transfiguration piston pump 10,4 variable volume chamber 1-4 that directly connect liquid case 16 form balanced system 30 with relevant pipeline.
Dividing plate 4 corners of 4 transfiguration piston pumps 10 are identical, and the piston 2 effective compressing areas that promptly belong in each transfiguration piston pump 10 among the variable volume chamber 1-4 of load system 20 are all identical at any one time, and the dividing plate 4 of 4 transfiguration piston pumps 10 of the present invention is rotated synchronously.
According to openly application for a patent for invention 200710013707.6, the flow coincidence formula of load system 20
Wherein ω is drive unit 40 angular velocity of rotations, and r is a cylindrical bottom surface radius, and a is a cylindrical bottom surface girth, and t is any time, and the cylinder height is slightly larger than 2A, and S is the effective compressing area of piston that belongs to load system 20 in the single transfiguration piston pump 10.
I.e. t at any time, when dividing plate 4 does not rotate, when promptly S was constant, the liquid total discharge that load system 20 sucks or discharges was a definite value.
These drive unit 40 concrete structures are referring to the piston pump driving mechanism that discloses in the application for a patent for invention 200710013707.6.
Concrete movement process:
T=0 constantly, each pump state as shown in Figure 9, reciprocating pump a, b, c, d, corresponding slide block is respectively a1, b1, c1, d1 (not shown on the figure), 1. the corresponding points E of each slide block, F, M, N lay respectively at a little (0,0),
When piston pump driving mechanism by direction shown in Figure 9, when rotating with angular velocity omega,
1, t=0 constantly, 1. slide block a1 (E point), b1 (F point), c1 (M point), d1 (N point) lay respectively at a little, 2., 3., 4.,
Slide block a1 (E point) is to 2. motion, and drivening rod moves downward, pump a discharge opeing;
Slide block b1 (F point) is to 3. motion, and drivening rod moves upward, pump b imbibition;
Slide block c1 (M point) is to 4. motion, and drivening rod moves upward, pump c imbibition;
Slide block d1 (N point) is to 1. motion, and drivening rod moves downward, pump d discharge opeing;
2,
Constantly, when slide block a1 (E point), b1 (F point), c1 (M point), d1 (N point) move to respectively 2., 3., 4., when 1. putting,
Slide block a1 (E point) is to 3. motion, and drivening rod moves upward, pump a imbibition;
Slide block b1 (F point) is to 4. motion, and drivening rod moves upward, pump b imbibition;
Slide block c1 (M point) is to 1. motion, and drivening rod moves downward, pump c discharge opeing;
Slide block d1 (N point) is to 2. motion, and drivening rod moves downward, pump d discharge opeing;
3,
Constantly, when slide block a1 (E point), b1 (F point), c1 (M point), d1 (N point) move to respectively 3., 4., 1., when 2. putting,
Slide block a1 (E point) is to 4. motion, and drivening rod moves upward, pump a imbibition;
Slide block b1 (F point) is to 1. motion, and drivening rod moves downward, pump b discharge opeing;
Slide block c1 (M point) is to 2. motion, and drivening rod moves downward, pump c discharge opeing;
Slide block d1 (N point) is to 3. motion, and drivening rod moves upward, pump d imbibition;
4,
Constantly, when slide block a1 (E point), b1 (F point), c1 (M point), d1 (N point) move to respectively 4., 1., 2., when 3. putting,
Slide block a1 (E point) is to 1. motion, and drivening rod moves downward, pump a discharge opeing;
Slide block b1 (F point) is to 2. motion, and drivening rod moves downward, pump b discharge opeing;
Slide block c1 (M point) is to 3. motion, and drivening rod moves upward, pump c imbibition;
Slide block d1 (N point) is to 4. motion, and drivening rod moves upward, pump d imbibition.
5,
Constantly, slide block a1 (E point), b1 (F point), c1 (M point), d1 (N point) move to respectively 1., 2., 3., 4. point.
So, promptly finish a cyclic process, finish imbibition, the discharge opeing process of one-period.
When dividing plate 4 rotations, when promptly S changes, the job analysis of device:
Be simplified illustration, get a transfiguration piston pump 10 and be example, as shown in Figure 8, in the work schematic representation of single transfiguration piston pump 10, the variable volume chamber 1-4 on the right connects safety check 11 and safety check 12 respectively by two different pipelines, and safety check 11 connects liquid case 13, and safety check 12 connects liquid case 14, connect load 15 between liquid case 13 and the liquid case 14, form load system 20.Left side variable volume chamber 1-4 connects liquid case 16 by pipeline 17, forms balanced system 30.Load system 20 drives load, and balanced system 30 is bringing onto load not.Liquid case 14 and liquid case 16 pass through pipeline connection, and a transfiguration valve 18 is set on this pipeline, and generally, transfiguration valve 18 is a closed condition.
When the piston 2 of transfiguration piston pump 10 moved downward, the volume of the variable volume chamber 1-4 on the right diminished, and forced liquid to advance liquid feeding tank 14 by safety check 12, thereby drove load 15, and liquid flows liquid feeding tank 13 again then; When the piston 2 of transfiguration piston pump 10 moved upward, it is big that the volume of the variable volume chamber 1-4 on the right becomes, the variable volume chamber 1-4 on the right of the liquid in the liquid case 13 enters by safety check 11, thus the load system 20 of transfiguration piston pump 10 forms a sealing and circulating.The cyclic process of balanced system 30 is similar with load system 20, and difference is that balanced system 30 is idle cycle.
If will under the constant situation of drive unit 40 rotating speeds, change the flow of load system 20 liquid, need rotatory handling 5-2, drive end cap 5 and dividing plate 4 rotations (by preceding described, the rotational synchronization of 4 dividing plates 4), open transfiguration valve 18 simultaneously, make the interior liquid of variable volume chamber 1-4 of the right and left communicate, this moment is owing to changed the corner of dividing plate 4, the piston 2 effective compressing area S in the load system 20 have promptly been changed
According to formula
Thereby changed the fluid flow of load system 20.
The handle 5-2 that stops operating closes transfiguration valve 18 simultaneously, and load system 20 can move under the state of equilibrium of new fluid flow.
If in the load system 20, dividing plate 4 corners are β, and piston 2 effective compressing areas are S, set the span of β and S,
0＜＝β＜＝Ω
x＜＝S＜＝X
And when S=x, β=0,
When S=X, β=Ω
Because effective compressing surface of piston 2 is the fan anchor ring,
Can establish S=∏ β+x, ∏ is a constant,
β=0 o'clock then, S=x,
During β=Ω, S=∏ Ω+x=X.
With S=∏ β+x substitution formula
Promptly
(0≤β≤Ω)
X k ω r a ∏ is constant.
If
G then
Always=f ∏ β+fx
Be G
AlwaysBe the linear function of β,, can make G as long as rotary end cover 5 changes β
AlwaysStepless variation.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (7)
1. transfiguration piston pump, it is characterized in that: comprise a cylinder body, described cylinder body is the cylinder with inner chamber;
A connecting rod, described connecting rod are arranged in described inner chamber of cylinder block and pass from the cylinder body two ends respectively, and described connecting rod is cylindrical body and is parallel to described inboard wall of cylinder block;
A piston, described piston are positioned at described cylinder body and fixedly connected with described connecting rod;
An end cap, described end cap are connected described cylinder body bottom surface and can relatively rotate with described cylinder body, and described end cap and described cylinder body serve as that axle relatively rotates with described connecting rod;
A dividing plate, be arranged at described piston bottom, described dividing plate passes described end cap, described dividing plate and described end bracket enclosed are slidingly connected, described dividing plate is divided into two variable volume chambers with the inner chamber of cylinder block of piston bottom, the junction plane sealed sliding of described dividing plate and described connecting rod movingly, simultaneously with the junction plane sealed sliding of described inboard wall of cylinder block movingly, the junction plane sealed sliding of described dividing plate top and described piston is movingly;
A dish seat is connected with described connecting rod bottom, and described dish seat upper surface and described dividing plate are slidingly matched;
Respectively be provided with a liquid hole on the cylinder wall of the variable volume chamber correspondence in the described cylinder body.
2. transfiguration piston pump according to claim 1 is characterized in that: described end cap is that rotary seal cooperates with described cylinder body bottom, is fastened by snap ring.
3. transfiguration piston pump according to claim 2, it is characterized in that: end periphery is provided with the cylinder body flange under the described cylinder body, end periphery is provided with the end cap flange on the described end cap, described cylinder body flange docks with described end cap flange, on the cylinder body flange that described snap ring is installed on described butt joint and the end cap flange described cylinder body is connected with described end cap.
4. transfiguration piston pump according to claim 3, it is characterized in that: described snap ring is two semi-circle bodies, its inner side surface has and described cylinder body flange that docks and end cap flange corresponding groove, end at each sheet semi-circle body has screw, described snap ring is connected as a single entity by connecting plate, has screw on the described connecting plate.
5. transfiguration piston pump according to claim 4 is characterized in that: described piston is the fan toroid.
6. according to claim 2 or 5 described transfiguration piston pumps, it is characterized in that: the cross section of described dividing plate is the fan toroid.
7. transfiguration piston pump according to claim 1 or 5, it is characterized in that: described end cap is provided with handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100136716A CN101225816B (en) | 2008-01-19 | 2008-01-19 | Transfiguration piston pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100136716A CN101225816B (en) | 2008-01-19 | 2008-01-19 | Transfiguration piston pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101225816A CN101225816A (en) | 2008-07-23 |
| CN101225816B true CN101225816B (en) | 2010-10-13 |
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ID=39857975
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100136716A Expired - Fee Related CN101225816B (en) | 2008-01-19 | 2008-01-19 | Transfiguration piston pump |
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| Country | Link |
|---|---|
| CN (1) | CN101225816B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3911793A (en) * | 1972-06-03 | 1975-10-14 | Nissan Motor | Fluid pressure to mechanical rotational position converting mechanism |
| CN1168716A (en) * | 1994-12-09 | 1997-12-24 | 株式会社小松制作所 | Control device for variable capacity hydraulic pump |
| CN1676929A (en) * | 2004-03-30 | 2005-10-05 | 株式会社川崎精机 | Variable displacement hydraulic pump control unit |
| CN200999725Y (en) * | 2007-01-30 | 2008-01-02 | 陶磊 | Rotary piston pump |
-
2008
- 2008-01-19 CN CN2008100136716A patent/CN101225816B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3911793A (en) * | 1972-06-03 | 1975-10-14 | Nissan Motor | Fluid pressure to mechanical rotational position converting mechanism |
| CN1168716A (en) * | 1994-12-09 | 1997-12-24 | 株式会社小松制作所 | Control device for variable capacity hydraulic pump |
| CN1676929A (en) * | 2004-03-30 | 2005-10-05 | 株式会社川崎精机 | Variable displacement hydraulic pump control unit |
| CN200999725Y (en) * | 2007-01-30 | 2008-01-02 | 陶磊 | Rotary piston pump |
Non-Patent Citations (2)
| Title |
|---|
| CN 200999725 Y,全文. |
| JP特开平6-117359A 1994.04.26 |
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| Publication number | Publication date |
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| CN101225816A (en) | 2008-07-23 |
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