CN202228296U - Rotational speed induction type variable displacement constant flow pump - Google Patents
Rotational speed induction type variable displacement constant flow pump Download PDFInfo
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- CN202228296U CN202228296U CN2011203046738U CN201120304673U CN202228296U CN 202228296 U CN202228296 U CN 202228296U CN 2011203046738 U CN2011203046738 U CN 2011203046738U CN 201120304673 U CN201120304673 U CN 201120304673U CN 202228296 U CN202228296 U CN 202228296U
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- pump
- constant flow
- axial piston
- variable
- valve
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Abstract
The utility model discloses a rotational speed induction type variable displacement constant flow pump, which comprises an axial plunger pump, a variable displacement spring, a variable displacement valve rod, a throttle valve cover, a fixed displacement pump, a two-position two-way reversing valve, a safety valve, a plurality of O-shaped seal rings, a displacement stop screw, an oil port plug and a damping hole. The variable displacement control technology is adopted in the whole operation process; the rotational speed induction type variable displacement constant flow pump is connected to an engine driving device; and all the control oil circuits are connected with connecting oil ports of a traversing mechanism reversing valve, a power-assisted oil cylinder and a hydraulic oil tank to form a hydraulic system. The rotational speed induction type variable displacement constant flow pump, which is mainly applied to automobile hydraulic power-assisted steering systems and hydraulic systems having constant flow control requirements, has the advantages that the system control is simple, the structure is compact, the system matching cost is low, the maintenance is easy, the rotational speed induction variable displacement technology is adopted to realize the different constant flow combined control manners, the energy is saved, the consumption and the noise are reduced, no high pressure overflow loss is caused, heat is well dissipated, the reliability is high, the service life is long, and the like.
Description
Technical field
The utility model mainly is widely used in the hydraulic power-assist steering system of automobile hydraulic electric power steering system or other running mechanism, also can be applied to the hydraulic system of controlling oil cylinder or motor constant motion, needing the repairing of constant current amount stage by stage simultaneously; Belong to the power control unit technical field.
Background technique
Existing automobile hydraulic electric power steering system adopts the constant-current system of engine-driving metering pump, because the speed range of motor is big, need amplify the hydraulic pressure pump delivery for overcoming the constant current amount state that the low speed hard steering obtains under the specific rotation speeds simultaneously; Exist low speed demand discharge capacity big; The technical contradiction state that the high-speed requirement discharge capacity is little is simultaneously because adopt Constant Pump System, for obtaining constant current control effect; Need to adopt dividing technology; Have high speed stage spill losses (loss in efficiency about 60%) important disadvantages, noise is big, the waste lot of energy, and hydraulic system produces life-span and the reliability that great amount of heat reduces hydraulic system; Because of most of automobile hydraulic electric power steering system all adopts the vane pump drive system, there is the shortcoming of high pressure anti-soil abrasion-resistance difference in vane pump, has strengthened the potential faults of hydraulic system.Automatically controlled separate system is shunted through detecting automobile traveling speed, exists the problem that spill losses is serious, control system is complicated, the maintenance maintenance cost is high to exist equally.Part adopts engine-driven variable displacement pump constant-current system; Because of what adopt is level pressure difference variable technology; Can only satisfy the constant flux control of little speed range and be single constant current amount state; The Variable Control pattern is single, can not satisfy the variable mode and require high and changeable occasion, and employing electromagnetism variable side system is complicated, cost is high.
Summary of the invention
The purpose of the utility model is to provide a kind of compact structure, easy for installation, system's control not to receive simply, that engine speed influences, the rotating speed induction type variable constant flow pump of no high pressure spill losses to automobile hydraulic electric power steering system or running mechanism.This rotating speed induction type variable constant flow pump is made up of axial piston pump (1), variable spring (2), variable valve rod (3), throttle-valve cap (4), metering pump (5), bi-bit bi-pass selector valve (6), safety valve (7) and some O-ring seals, discharge capacity stop screw, hydraulic fluid port plug, damping hole.When engine drives axial piston pump (1) is worked, also drive metering pump (5) work, two pumps are in independently work system.Owing to adopt the variable technology, there is not the high pressure spill losses mainly to the work system fuel feeding in axial piston pump (1).Metering pump (5) mainly works to provide control signal, because the discharge capacity of metering pump (5) is arranged in V
Fixed=3-4ml/r, maximum pressure is 0.5MPa, belongs to operating on low voltage; So even when being in fast state work, the spill losses of metering pump (5) is still quite small, does not produce too much heat; Prolong the life-span of metering pump (5) greatly; Metering pump (5) also plays the effect of taking away the hydraulic system heat simultaneously, reduces the fault of whole hydraulic system, improves lifetime of system and reliability.
The technical solution of the utility model is such: a kind of rotating speed induction type variable constant flow pump; Its structure is by axial piston pump, variable spring, variable valve rod, throttle-valve cap, metering pump, bi-bit bi-pass selector valve, safety valve, oil sump tank, main pump, direction machine, it is characterized in that axial piston pump, variable spring, variable valve rod, throttle-valve cap is integrated is installed on the axial piston pump pump housing.
Metering pump, bi-bit bi-pass selector valve, safety valve is integrated is installed on the axial piston pump pump cover; The metering pump main shaft is connected through spline with the plunger pump main shaft; Shared one drives power; The shared oil input channel of metering pump and axial piston pump, oil input channel is installed on the axial piston pump pump cover, and safety valve overflow oil duct directly is communicated with back into oil duct.
Axial piston pump is given work system fuel feeding as required separately.
Metering pump connects axial piston pump and is directly proportional with engine speed.
Metering pump is vane pump or gear pump or axial piston pump or radial plunger pump, and bi-bit bi-pass selector valve, safety valve are communicated with working oil path.
The advantage of the existing application system of the utility model contrast is: system's control is simple, compact structure, system matches cost are low, safeguard easily, adopt rotating speed induction variable technology, realize advantages such as different constant current amount composite control modes, energy-saving and cost-reducing noise reduction, no high pressure spill losses, good heat dissipation, reliability long-life length.
Description of drawings
It is such that the structure of the utility model constitutes:
Fig. 1 installs the main sectional view of looking of assembling for the overall structure of the utility model.
Fig. 2 is that A-A sectional view among Fig. 1 is pressed in the overall structure installation assembling of the utility model.
Fig. 3 is the control principle figure of the utility model.
Fig. 4 is the rotating speed traffic characteristic plotted curve of the utility model.
Fig. 5 is the applying examples schematic diagram of the utility model.
Among Fig. 1～Fig. 5, axial piston pump (1), variable spring (2), variable valve rod (3), throttle-valve cap (4), metering pump (5), bi-bit bi-pass selector valve (6), safety valve (7), oil sump tank (8), damping hole (9), throttle orifice (10), even main pump oil outlet (11), even main pump import hydraulic fluid port (12), main pump (13), direction machine (14), left-hand rotation (15), right-hand rotation (16).
What the metering pump in the utility model case (5) adopted is the vane pump structure.
Embodiment
The most preferred embodiment of the utility model is such; With reference to accompanying drawing; The control principle of the utility model is such: engine drives axial piston pump (1) drives metering pump (5) work simultaneously to system's fuel feeding, and the rotating speed of metering pump (5) is the same with engine speed; Keep proportional relationship, set demand volume rotation speed n=q/V when motor reaches
Post=q/ П r
The chamber 22R
CylinderIn the time of Ztg β, the flow that metering pump (5) provides cooperates the metering orifice that constitutes to form the pressure loss signal delta P=ε ρ (nV of proportional relationship through variable valve rod (3) with throttle-valve cap (4)
Fixed)
2/ 2 (A
Joint60)
2, big chamber and loculus that the signal before and after the throttling is guided to variable valve rod (3) respectively form pressure differential signal promotion variable valve rod (3) compression variable spring (2) formation directly proportional displacement amount X
Valve=[Δ P (A
Greatly-A
Little)-K
ReturnX
Return-F
Swash plate]/K
Valve, the variable swash plate that variable valve rod (3) promotes axial piston pump (1) carries out variable, satisfies variable and Flow-rate adjustment that the above-mentioned relation formula is realized setting.Along with the rising of engine speed, throttle orifice pressure loss Δ P increases, and variable valve rod (3) displacement distance increases, and axial piston pump (1) discharge capacity diminishes, and guarantees that axial piston pump (1) provides constant flow to system.When engine speed continues to increase; Variable valve rod (3) moves to certain position; This variations per hour valve rod (3) major diameter part cooperates the metering orifice area A joint that constitutes sharply to diminish with throttle-valve cap (4), form new ratio pressure loss Δ P, and it is big that axial piston pump (1) swash plate variable ratio becomes; The constant current amount littler than the preceding constant current amount stage is provided, realizes multistage constant current amount adjustment.Too high when axial piston pump (1) working pressure, safety valve (7) is opened, bi-bit bi-pass selector valve (6) switching-over simultaneously, and the system works oil spill flows back to the main pump filler opening, plays the effect of the whole hydraulic system of protection.A kind of rotating speed induction type variable constant flow pump, its structure is made up of axial piston pump (1), variable spring (2), variable valve rod (3), throttle-valve cap (4), metering pump (5), bi-bit bi-pass selector valve (6), safety valve (7) and some O-ring seals, discharge capacity stop screw, hydraulic fluid port plug, damping hole.Axial piston pump (1), variable spring (2), variable valve rod (3), throttle-valve cap (4) are integrated on the axial piston pump pump housing.Metering pump (5), bi-bit bi-pass selector valve (6), safety valve (7) are integrated on the axial piston pump pump cover, and the metering pump main shaft is connected through spline with the plunger pump main shaft, and shared one drives power; Metering pump (5) and the shared oil input channel of axial piston pump (1), oil input channel is arranged on the axial piston pump pump cover; Safety valve (7) overflow oil duct directly is communicated with back into oil duct.Axial piston pump (1) is given work system fuel feeding as required separately, and working pressure is high, stain resistance is strong, no high pressure spill losses.Metering pump (5) provides plunger pump Variable Control signal separately; Variable signal is produced by the flow of metering pump (5); Be directly proportional with engine speed, metering pump is in low-pressure state work, and little, the empty stream loss of discharge capacity is little, flow pulsation is little, improve metering pump working life and reliability.Metering pump (5) can be vane pump, gear pump, axial piston pump, radial plunger pump etc.Flux signal and difference pressuring loss that the motion of variable spring (2), variable valve rod (3), throttle-valve cap (4) cooperates generation to be directly proportional with engine speed; Form the interim variable displacement that is directly proportional with rotating speed and promote axial piston pump swash plate variable, form the constant current state in different rotating speeds stage.Bi-bit bi-pass selector valve (6), safety valve (7) are communicated with working oil path, and work system pressure surpasses safety valve setting pressure, bi-bit bi-pass selector valve (6) transposition, and the effect of protection axial piston pump is played in the fluid overflow.Compact structure, volume is little, and is easy for installation; Control system is simple, need not complicated automatical control system is set in addition, and is easy to maintenance; System does not have high pressure loss, and is energy-saving and cost-reducing, and the variable reaction is fast, and it is little to pulse.Can easily realize that with the fit form of throttle-valve cap (4) variable characteristics of different proportion obtains different rotating speed constant current state combining form through changing variable valve rod (3).In the time of variable valve rod (3) control axial piston pump (1) variable, the cooperation of variable valve rod (3) and throttle-valve cap (4) throttle orifice also forms self-regulating variable throttling pressure difference signal simultaneously.Describe with the applying examples schematic diagram: in automobile assisted power steering system, rotating speed induction type variable constant flow pump is connected to engine drive device, and each control oil channel of pressing schematic diagram connection pump links to each other with the hydraulic fluid port that is connected of direction machine selector valve, power-assisted oil cylinder, hydraulic oil container; Form a hydraulic system; When automobile begins to walk, driver's steering wheel rotation, the switching-over of direction machine selector valve; Rotating speed induction type variable constant flow pump plays the power-assisted effect to power-assisted oil cylinder fuel feeding; Because there are the dislocation angle in steering wheel main shaft and selector valve, steering wheel turns to the switching-over of control direction machine selector valve to have precedence over the switching-over of surging, and when steering wheel stops operating, relies on the back effect that relates to of oil cylinder motion to automatically reset.The constant flow rate that rotating speed induction type variable constant flow pump constantly provides difference to go demand under the speed stage to system at work; Play the effect of power steering, increase feel and operating security; Owing to adopt the variable technology, do not have the high pressure spill losses in the whole operation process, do not have a large amount of heats and produce; Hydraulic oil is in normal operating temperature, has improved the reliability and the life-span of system.
Claims (5)
1. rotating speed induction type variable constant flow pump; Its structure is by axial piston pump, variable spring, variable valve rod, throttle-valve cap, metering pump, bi-bit bi-pass selector valve, safety valve, oil sump tank, main pump, direction machine, it is characterized in that axial piston pump (1), variable spring (2), variable valve rod (3), throttle-valve cap (4) is integrated is installed on the axial piston pump pump housing.
2. according to the described rotating speed induction type of claim 1 variable constant flow pump; It is characterized in that metering pump (5), bi-bit bi-pass selector valve (6), safety valve (7) is integrated is installed on the axial piston pump pump cover; The metering pump main shaft is connected through spline with the plunger pump main shaft, and shared one drives power, metering pump (5) and the shared oil input channel of axial piston pump (1); Oil input channel is installed on the axial piston pump pump cover, and safety valve (7) overflow oil duct directly is communicated with back into oil duct.
3. according to the described rotating speed induction type of claim 1 variable constant flow pump, it is characterized in that axial piston pump (1) gives work system fuel feeding as required separately.
4. according to the described rotating speed induction type of claim 1 variable constant flow pump, it is characterized in that metering pump (5) connects axial piston pump (1) and is directly proportional with engine speed.
5. according to the described a kind of rotating speed induction type variable constant flow pump of claim 1, it is characterized in that metering pump (5) is vane pump or gear pump or axial piston pump or radial plunger pump, bi-bit bi-pass selector valve (6), safety valve (7) are communicated with working oil path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203046738U CN202228296U (en) | 2011-08-22 | 2011-08-22 | Rotational speed induction type variable displacement constant flow pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203046738U CN202228296U (en) | 2011-08-22 | 2011-08-22 | Rotational speed induction type variable displacement constant flow pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202228296U true CN202228296U (en) | 2012-05-23 |
Family
ID=46078883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203046738U Expired - Fee Related CN202228296U (en) | 2011-08-22 | 2011-08-22 | Rotational speed induction type variable displacement constant flow pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202228296U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305204A (en) * | 2011-08-22 | 2012-01-04 | 广西玉柴重工有限公司 | Rotating speed induction type variable constant flow pump |
| CN103821764A (en) * | 2014-02-28 | 2014-05-28 | 洛阳东方动力机械有限公司 | Constant flow pump rear cover |
-
2011
- 2011-08-22 CN CN2011203046738U patent/CN202228296U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305204A (en) * | 2011-08-22 | 2012-01-04 | 广西玉柴重工有限公司 | Rotating speed induction type variable constant flow pump |
| CN103821764A (en) * | 2014-02-28 | 2014-05-28 | 洛阳东方动力机械有限公司 | Constant flow pump rear cover |
| CN103821764B (en) * | 2014-02-28 | 2016-06-01 | 洛阳东方动力机械有限公司 | A kind of constant flow pump bonnet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20150822 |
|
| EXPY | Termination of patent right or utility model |