CN205001135U - Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor - Google Patents
Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor Download PDFInfo
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- CN205001135U CN205001135U CN201520675207.9U CN201520675207U CN205001135U CN 205001135 U CN205001135 U CN 205001135U CN 201520675207 U CN201520675207 U CN 201520675207U CN 205001135 U CN205001135 U CN 205001135U
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- control piston
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- hydraulic pump
- piston
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Abstract
The utility model discloses a variable control piston of volume adjustable hydraulic pump, motor, control piston (1A) install on pump, motor (5A), and control piston (1A) links to each other with the sloping cam plate through connecting rod or other complementary unit, and control piston's (1A) internally mounted has control case (2A), spring (3A) and spring holder (4A), and control case (2A) has annular step face, the structure include three oil pocket: the pi chamber of intercommunication control oil sources, the pc chamber of intercommunication control piston right -hand member and the T chamber of intercommunication drain tap, on control case (2A), be provided with the join in marriage class step of a width for b, on control piston (1A) hole, be provided with the join in marriage class window of effective width for a. The utility model discloses to control case, spring and the integrated inside to control piston of main oil duct, to some special purpose's miniature volume adjustable hydraulic pump, motor, furthest reduces its overall dimension and weight.
Description
Technical field
The utility model belongs to technical field of hydraulic pressure, is specifically related to a kind of volume adjustable hydraulic pump, the Variable Control piston of motor and oil hydraulic pump, motor.
Background technique
Common volume adjustable hydraulic pump, motor have inclined disc type, the structural type such as clino-axis type and blade type.Various volume adjustable hydraulic pump, motor all commonly use hydraulic coupling to drive stroking mechanism, this just needs to use Variable Control piston, be equipped with control valve and the annex (as connecting rod, spring, position feedback mechanism etc.) of various function, realize the various Variable Control functions of design.
The Variable Control piston of prior art and control valve are two relatively independent modules, are communicated with between the two by built-in oil duct or external pipeline.
The structural representation of open circuit with inclined disc type volume adjustable hydraulic pump as shown in Figure 1.On return piston 6, effect has Returnning spring 7, and its right chamber effect simultaneously has pump discharge pressure Pi.Return piston 6 withstands on swash plate 1 by push rod A8, and under original state, swash plate 1 is under the acting in conjunction of the hydraulic coupling suffered by return piston 6 and spring force, works in maximum pendulum angle.
The other end of swash plate, is provided with control piston 3 and push rod B2, and the right cavity pressure Pc of control piston is controlled by control valve 4.Because the acting force arm of control piston 3 and return piston 6 pairs of swash plate oscillation centers is roughly the same, and the active area of control piston 3 is more much bigger than the active area of return piston 6, therefore when control piston cavity pressure Pc raises, control piston will be moved to the left, swash plate is flapped toward small angle, and pump displacement reduces.
The right cavity pressure Pc of control piston, is controlled by control valve 4, by the right cavity pressure Pc of regulable control piston, can regulate pump delivery.The oil suction chamber Pi of control valve, control chamber Pc and the built-in oil duct of draining chamber T by processing on end cap 5, be communicated with respectively and pump hydraulic fluid port, the right chamber of control piston and pump draining chamber.The function of control valve 4 designs according to user demand, adopts the control valve of difference in functionality can obtain different Variable Control functions, as the many kinds of Isobarically Control, Ioad-sensing control, power limitation control, the automatically controlled or positive inverted flux control of hydraulic control etc.
The control valve of prior art, is an independently assembly, is arranged on the outside of pump, motor.Oil suction chamber Pi, the control chamber Pc of control valve are communicated with control oil sources mouth, control piston chamber and draining chamber with draining chamber T respectively by built-in oil duct or exterior line.This structure is favourable to the modularization of component, General design, therefore rarely has query in conventional application.
But when this structure is applied to miniature variable displacement pump, the motor of specific use (as Aeronautics and Astronautics, small scale robot etc.), its compactedness is not enough, profile and weight defect bigger than normal are just completely exposed.
Due to the needs installed and process, control valve significantly can not reduce and proportional reducing because of the discharge capacity of pump, motor.Specifically, for ensureing the workability of spool bore and ensureing the reliability of spool flow, valve core diameter can not design too small; For arrangement of valves internal oil channel and control valve annex (as spring, swivel nut, auxiliary hole plug, screw and Sealing etc.), control valve body can not design too little (in the weight formation of control valve, valve body accounting is maximum usually).When control valve overall weight is reduced to the hectogram order of magnitude, even if required control flow is very little, rethinks and alleviate control valve overall weight further and be just difficult to substantive breakthroughs.Hectogram level weight is for variable displacement pump, the motor of normal usage, substantially negligible; But for specific use, body weight also only has for the micropump of a few hectogram, motor, is but a googol.
For special applications, very strict miniature variable displacement pump, motor are required to weight and installation dimension, when inquiring into the solution of the problems referred to above, can find that technology comes design con-trol valve and Variable Control piston routinely, is difficult to effectively reduce Total Product weight and boundary dimension.Its main cause, except the weight of control valve self, particularly control valve body compare pump, motor body proportion comparatively large except, in order to valve being installed to pump, motor body and the shared space of the screw hole, oil channel hole, seal ring etc. that arrange in main body, the impact of overall weight and boundary dimension all be can not be ignored.
Summary of the invention
The purpose of this utility model is the Variable Control piston providing a kind of volume adjustable hydraulic pump, motor for the deficiencies in the prior art, control valve spool, spring and main oil duct are integrated into the inside of control piston by this piston, for miniature volume adjustable hydraulic pump, the motor of some specific use (as Aeronautics and Astronautics, small scale robot etc.), reduce its boundary dimension and weight to greatest extent.
The purpose of this utility model and solve its technical problem underlying and realize by the following technical solutions: the Variable Control piston of a kind of volume adjustable hydraulic pump, motor, control piston is arranged in pump, motor body, control piston is connected with swash plate by connecting rod or other assisting agencies, it is characterized in that: the inside of control piston is provided with and controls spool, spring and spring seat, controlling spool has annular table terrace;
In the space that described control piston, control spool, pump or motor body, piston end cap form, include three oil pockets: be communicated with the Pi chamber controlling oil sources, be communicated with the Pc chamber of control piston right-hand member and the T chamber being communicated with drain tap;
On control spool, be provided with the flow step that a width is b; On control piston endoporus, be provided with the flow window that Effective face width is a.
Described a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, wherein: described flow step width b is less than or equal to flow window width a.
Described a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, wherein: the left end diameter of control piston is less than right-hand member diameter.
Described a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, wherein: in spring seat and piston end cap, add an auxiliary spool.
Described a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, wherein: be fixed on by control piston in pump, motor body, increase piston cylinder.
The application of described a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, it is characterized in that: be applied to plate variable plunger pump, motor, also can be applicable to clino-axis type Variable plunger pump, motor, and the variable displacement pump of blade type or other structural types, motor.
The utility model principle: Pi acts on the annular table terrace controlling spool 2A, and its effective active area is
, action direction to the right.The right side effect controlling spool 2A has spring 3A, and the hydraulic coupling suffered by control spool 2A and the elastic force of spring 3A contend with.
When Pi increases to a certain degree, the hydraulic coupling controlled suffered by spool 2A will overcome the pre-pressure of the spring of its right-hand member, promote to control spool 2A to move to right, control the oil-distribution port that the flow step on spool 2A will align gradually, cross on control piston 1A, close the oil duct in Pc chamber and T chamber, and Pi chamber is communicated with Pc chamber, pressure oil enters into the right chamber of control piston 1A, promotes control piston 1A and moves to left, and drives swash plate to rotate to little pivot angle, pump displacement reduces, thus realizes Isobarically Control.But the technical solution of the utility model is not limited to and realizes Isobarically Control, by arranging control spool and the auxiliary element of difference in functionality in control piston, also other multiple control modes can be realized.
The concrete structure of the control piston that the utility model relates to and control spool can have multiple choices, and on basis of the present utility model, no matter how control piston changes with control spool, all has following common trait:
1, control valve in-core is placed in control piston.
2, described structure at least comprises three cavity volumes: be communicated with the Pi chamber (usually come from delivery side of pump or motor inlet, but also can come from outside oil sources) controlling oil sources; Be communicated with the Pc chamber in control piston chamber, the pressure oil in Pc chamber produces axial force to control piston, can promote piston or piston cylinder generation axial displacement; Be communicated with the T chamber of built-in or external draining oil circuit.
The control spool of 3, described structure is provided with the flow step that Effective face width is b, in the control piston of described structure, is provided with the flow window that Effective face width is a.As preferably, b is slightly less than or equals a.
4, control spool when producing axial displacement relative to control piston, under the mating reaction of flow step and flow window, Pc chamber can be made to switch between connection T cavity-like state and connection Pi cavity-like state.
The utility model compared with prior art has obvious advantage and beneficial effect.From above technological scheme, the Variable Control piston that the utility model relates to, is integrated into the inside of control piston by control valve spool, spring and main oil duct.Because the utility model decreases number of spare parts, particularly decrease the valve body that weight accounting is maximum in control valve, variable displacement pump, motor gross weight and boundary dimension are significantly reduced.Simultaneously, compared to the product conventionally designed, because the main body of pump, motor not needing headspace to install control valve and to arrange the oil duct be communicated with between control valve and control piston chamber, take full advantage of again the inner space of control piston, the gross weight of variable displacement pump, motor and boundary dimension are reduced further.According to miniature variable displacement pump, the motor of the utility model design, compared to the same specification product of prior art, its power-weight ratio has clear ahead advantage.
The utility model can be applicable to plate variable plunger pump, motor, also can be applicable to clino-axis type Variable plunger pump, motor, and the variable displacement pump of blade type or other structural types, motor.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art open circuit with inclined disc type volume adjustable hydraulic pump,
Fig. 2-1 is structural representation of the present utility model,
Fig. 2-2 is hydraulic schematic diagrams of Fig. 2-1,
Fig. 3-1 is the structural representation of another embodiment of the utility model,
Fig. 3-2 is hydraulic schematic diagrams of Fig. 3-1,
Fig. 4-1 is the structural representation of another embodiment of the utility model,
Fig. 4-2 is hydraulic schematic diagrams of Fig. 4-1,
Fig. 5-1 is the structural representation of another embodiment of the utility model,
Fig. 5-2 is hydraulic schematic diagrams of Fig. 5-1,
Fig. 6 is volume adjustable hydraulic pump, the motor schematic diagram that the utility model controls.
Mark in figure: 1, swash plate, 2, push rod B, 3, control piston, 4, control valve, 5, end cap, 6, return piston, 7, Returnning spring, 8, push rod A.
1A, control piston, 2A, control spool, 3A, spring, 4A, spring seat, 5A, main body, 6A, piston end cap, 7A, return piston, 8A, Returnning spring;
1B, auxiliary spool;
1C, piston cylinder;
1D, body, 2D, swash plate, 3D, connecting rod, 4D, spring, 5D, spring spindle;
A is control piston 1A endoporus flow window Effective face width;
B is the width controlling flow step on spool 2A.
Be communicated with the Pi chamber controlling oil sources;
Be communicated with the Pc chamber of control piston right-hand member;
Be communicated with the T chamber of drain tap.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to a kind of volume adjustable hydraulic pump that the utility model proposes, the Variable Control piston of motor and oil hydraulic pump, motor embodiment, feature and effect thereof, be described in detail as follows.
See Fig. 2-1, the Variable Control piston of a kind of volume adjustable hydraulic pump, motor, control piston 1A is arranged on pump, motor body 5A, the inside of control piston 1A is provided with and controls spool 2A, spring 3A and spring seat 4A, control piston 1A is connected with swash plate by connecting rod or other assisting agencies, do not draw assisting agency and swash plate in Fig. 2-1, swash plate when control piston moves, can be driven to swing and variable; Control spool 2A and have annular table terrace;
In the space that described control piston 1A, control spool 2A, pump main body 5A, piston end cap 6A form, include three oil pockets: the Pi chamber being communicated with pump discharge oil, be communicated with the Pc chamber of control piston right-hand member and the T chamber being communicated with drain tap;
On control spool 2A, be provided with the flow step that a width is b; On control piston 1A endoporus, be provided with the flow window that Effective face width is a, as preferably, b is less than or equal to a.
The utility model principle: as Fig. 2-2, swash plate, under the effect of return piston 7A and Returnning spring 8A, initially works in big swing angle.Return piston 7A wherein also can cancel, and swash plate is initial works in big swing angle only to rely on the effect of Returnning spring 8A to make.Pi acts on the annular table terrace controlling spool 2A, and its effective active area is
, action direction to the right.The right side effect controlling spool 2A has spring 3A, and the hydraulic coupling suffered by control spool 2A and the elastic force of spring 3A contend with.
When Pi increases to a certain degree, the hydraulic coupling controlled suffered by spool 2A will overcome the pre-pressure of the spring of its right-hand member, promote to control spool 2A to move to right, control the oil-distribution port that the flow step on spool 2A will align gradually, cross on control piston 1A, close the oil duct in Pc chamber and T chamber, and Pi chamber is communicated with Pc chamber, pressure oil enters into the right chamber of control piston 1A, promotes control piston 1A and moves to left, and drives swash plate to rotate to little pivot angle, pump displacement reduces, thus realizes Isobarically Control.
The technical solution of the utility model is not limited to and realizes Isobarically Control, by arranging control spool and the auxiliary element of difference in functionality in control piston, also can realize other multiple control modes; The concrete structure of control piston and control spool, according to the needs such as space layout and technology capability, can change to some extent.Below again for three embodiments.
As shown in Fig. 3-1,3-2, above-mentioned a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, the two ends diameter of control piston 1A is unequal, and left end diameter D1 is less than its right-hand member diameter D2, Pi chamber acts on the annular table terrace of control piston 1A, and its effective active area is
, action direction, under the acting in conjunction of Returnning spring 8A, shifts control piston 1A onto right position under original state to the right, and swash plate is initial works in big swing angle.Scheme shown in its working principle and mechanism and Fig. 2-1,2-2 is substantially identical.
As shown in Fig. 4-Isosorbide-5-Nitrae-2, above-mentioned a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, add an auxiliary spool 1B.The annular table terrace controlling spool 2A is still subject to the active force of Pi, and its right-hand member is then subject to elastic force and the thrust left of auxiliary spool 1B under outside pressure P r effect of spring 3A simultaneously.By regulating external pressure Pr, the remote adjustment of pump constant-pressure pressure can be realized, namely realize long-range Isobarically Control; If allow Pc equal with the effective active area of Pr to auxiliary spool 1B to the effective active area controlling spool 2A in design,
, then Ioad-sensing control can be realized.
As shown in fig. 5-1, compared to the scheme shown in Fig. 2, be that control piston 1A is fixed on pump main body 5A, increase piston cylinder 1C.Control piston 1A right cavity pressure promotes piston cylinder 1C when raising and moves right, and drives swash plate to swing by piston cylinder 1C.
The application of above-mentioned a kind of volume adjustable hydraulic pump, the Variable Control piston of motor, is applied to plate variable plunger pump, motor, also can be applicable to clino-axis type Variable plunger pump, motor, and the variable displacement pump of blade type or other structural types, motor.
Use oil hydraulic pump, motor that the Variable Control piston of a kind of volume adjustable hydraulic pump of above-mentioned Variable Control piston, motor controls, as Fig. 6.Described Variable Control piston is arranged on body 1D, is connected with swash plate 2D by connecting rod 3D; The elastic force of spring 4D acts on the other end of swash plate by spring spindle 5D.
No matter how control piston changes with control spool the utility model, all has following common trait:
1, control valve in-core is placed in control piston.
2, described structure at least comprises three cavity volumes: be communicated with the Pi chamber (usually come from delivery side of pump or motor inlet, but also can come from outside oil sources) controlling oil sources; Be communicated with the Pc chamber in control piston chamber, the pressure oil in Pc chamber produces axial force to control piston, can promote piston or piston cylinder generation axial displacement; Be communicated with the T chamber of built-in or external draining oil circuit.
The control spool of 3, described structure is provided with the flow step that Effective face width is b, in the control piston of described structure, is provided with the flow window that Effective face width is a.As preferably, b is slightly less than or equals a.
4, control spool when producing axial displacement relative to control piston, under the mating reaction of flow step and flow window, Pc chamber can be made to switch between connection T cavity-like state and connection Pi cavity-like state.
The Variable Control piston that the utility model relates to, is integrated into the inside of control piston by control valve spool, spring and main oil duct.Because the utility model decreases number of spare parts, particularly decrease the valve body that weight accounting is maximum in control valve, variable displacement pump, motor gross weight and boundary dimension are significantly reduced.Simultaneously, compared to the product conventionally designed, because the main body of pump, motor not needing headspace to install control valve and to arrange the oil duct be communicated with between control valve and control piston chamber, take full advantage of again the inner space of control piston, the gross weight of variable displacement pump, motor and boundary dimension are reduced further.According to miniature variable displacement pump, the motor of the utility model design, compared to the same specification product of prior art, its power-weight ratio has clear ahead advantage.
The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, anyly do not depart from technical solutions of the utility model content, the any simple modification done above embodiment according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (5)
1. the Variable Control piston of a volume adjustable hydraulic pump, motor, control piston (1A) is arranged in pump, motor body (5A), control piston (1A) is connected with swash plate by connecting rod, it is characterized in that: the inside of control piston (1A) is provided with and controls spool (2A), spring (3A) and spring seat (4A), controlling spool (2A) has annular table terrace;
Described structure includes three oil pockets: be communicated with the Pi chamber controlling oil sources, is communicated with the Pc chamber of control piston right-hand member and the T chamber being communicated with drain tap;
In control spool (2A), be provided with the flow step that a width is b; On control piston (1A) endoporus, be provided with the flow window that Effective face width is a.
2. the Variable Control piston of a kind of volume adjustable hydraulic pump as claimed in claim 1, motor, is characterized in that: described flow step width b is less than or equal to flow window width a.
3. the Variable Control piston of a kind of volume adjustable hydraulic pump as claimed in claim 1, motor, is characterized in that: add an auxiliary spool (1B) in spring seat (4A) and piston end cap (6A).
4. the Variable Control piston of a kind of volume adjustable hydraulic pump as claimed in claim 1, motor, is characterized in that: be fixed on by control piston (1A) in pump, motor body (5A), increases piston cylinder (1C).
5., with oil hydraulic pump, motor that the Variable Control piston of a kind of volume adjustable hydraulic pump described in one of claim 1-4, motor controls, it is characterized in that: described Variable Control piston is arranged on body (1D), is connected with swash plate (2D) by connecting rod (3D); The elastic force of spring (4D) acts on the other end of swash plate by spring spindle (5D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520675207.9U CN205001135U (en) | 2015-09-02 | 2015-09-02 | Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520675207.9U CN205001135U (en) | 2015-09-02 | 2015-09-02 | Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205001135U true CN205001135U (en) | 2016-01-27 |
Family
ID=55158027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520675207.9U Withdrawn - After Issue CN205001135U (en) | 2015-09-02 | 2015-09-02 | Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205001135U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134538A (en) * | 2015-09-02 | 2015-12-09 | 贵阳海之力液压有限公司 | Variable control piston of variable hydraulic pump and motor and application thereof |
-
2015
- 2015-09-02 CN CN201520675207.9U patent/CN205001135U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134538A (en) * | 2015-09-02 | 2015-12-09 | 贵阳海之力液压有限公司 | Variable control piston of variable hydraulic pump and motor and application thereof |
| CN105134538B (en) * | 2015-09-02 | 2017-04-05 | 贵阳海之力液压有限公司 | A kind of volume adjustable hydraulic pump, the Variable Control piston of motor and its application |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160127 Effective date of abandoning: 20170405 |