CN1304763C - Crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms - Google Patents
Crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms Download PDFInfo
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- CN1304763C CN1304763C CNB2005100234560A CN200510023456A CN1304763C CN 1304763 C CN1304763 C CN 1304763C CN B2005100234560 A CNB2005100234560 A CN B2005100234560A CN 200510023456 A CN200510023456 A CN 200510023456A CN 1304763 C CN1304763 C CN 1304763C
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Abstract
The present invention relates to a stepless variable mechanism of a crank shaft and connecting rod type hydraulic motor with low speed and high torque in the technical field mechanical engineering. The present invention comprises an eccentric shaft, a slide valve cavity, an eccentric sleeve, a valve sleeve, a restoring spring of the valve sleeve, a valve core and nuts, wherein a hydraulic servo control device is composed of the valve sleeve, the restoring spring of the valve sleeve, the valve core and the nuts; the eccentric shaft is provided with the slide valve cavity, two flow passages and a leak oil passage; the valve sleeve and the restoring spring of the valve sleeve are arranged in the slide valve cavity; the open end of the valve sleeve is provided with the restoring spring of the valve sleeve; the valve core is arranged in the valve sleeve, and is connected with the eccentric sleeve by the nuts and steps of a shaft outward extending on the valve core; the open end of the slide valve cavity is connected with the open end of the valve sleeve through the restoring spring of the valve sleeve. The present invention has the advantages of simple structure, reliable work, low cost and high anti-interference capability, and realizes the accurate positioning and the stepless variable of the eccentric sleeve of the crank shaft and connecting rod type hydraulic motor with low speed and high torque without the influence of actual working pressure.
Description
Technical field
What the present invention relates to is a kind of stepless variable mechanism, specifically, is a kind of crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms.Belong to mechanical engineering technical field.
Background technique
At present, the stroking mechanism of crankshaft connecting rod type low-speed high-torque hydraulic motor is divided into two kinds, and a kind of is the two-stage variable displacement mechanism, and shortcoming is to change between the two-stage discharge capacity, impacts greatly, is of limited application; Another kind is to increase oil hydraulic circuit on the basis of two-stage change discharge capacity controlling mechanism, discharge capacity according to the instantaneous change oil hydraulic motor of the variation of induced pressure, realize the permanent power adjustments of oil hydraulic motor output power, shortcoming is to increase oil hydraulic circuit and sensor, parts, link are many, just carry out the limited adjusting of oil hydraulic motor output power, and the discharge capacity of stepless change oil hydraulic motor as required makes the practical ranges of an oil hydraulic motor be restricted according to induced pressure.
Find by prior art documents, Chinese patent publication number CN1322900Y, open day is November 21 calendar year 2001, this denomination of invention is: a kind of crankshaft connecting rod type radial plunger pump of automatic variable, the crank of pump is a disc spring shape on this patent, crank spreads or shrinks from dynamic elasticity with the size of induced pressure in transmission process, the setting output that need not change prime mover with it just can realize the automatic stepless speed change of automatic stepless variable and hydraulic system, and simple in structure, cost is low, easy to manufacture.This patent is based on the permanent power output of pump equally, change the output flow of pump with the variation of pressure signal, and this patent can't be applied on the oil hydraulic motor directly.In further literature search, find as yet and the identical or similar report of theme of the present invention " crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms ".
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms is provided, make it can change the throw of eccentric of oil hydraulic motor according to the variation of extraneous pressure signal (or with the corresponding electrical signal of this pressure signal), and then the discharge capacity of change oil hydraulic motor, realize the stepless variable of oil hydraulic motor, and, make the stroking mechanism also can stable operation under the situation of pressure surge by the reverse feedback of position machinery.The present invention is simple in structure, the control accuracy height.
The present invention is achieved by the following technical solutions, the present invention includes: eccentric shaft, piston chamber, eccentric bushing, valve pocket, the valve pocket Returnning spring, spool, nut, valve pocket wherein, the valve pocket Returnning spring, spool, nut is formed the Hydraulic Servo Control device, on eccentric shaft, be provided with piston chamber, article two, runner, article one, leak oil duct, described two runners, wherein first flow communicates with the filler opening of oil hydraulic motor, first flow by the Hydraulic Servo Control device respectively with eccentric shaft on big variable piston cavity; little variable piston cavity links to each other; second runner communicates with the device of the pressure output control oil of oil hydraulic motor; second runner links to each other with the closed end of piston chamber; described leakage oil duct communicates with the body cavity of oil hydraulic motor; be provided with valve pocket in piston chamber; the valve pocket Returnning spring; the opening end at valve pocket is provided with the valve pocket Returnning spring; be provided with spool in valve pocket; spool connects with eccentric bushing by overhanging step on nut and the spool, and the opening end of piston chamber passes through the valve pocket Returnning spring and connects with the opening end of valve pocket.
The intermediate portion of the cavity inboard of described piston chamber is provided with the oil groove of five road annulars, and piston chamber has two ends, wherein end sealing, and this end links to each other with second runner, and the other end is provided with opening, and this opening is by the axle of spool.
Described five road oil grooves, in the effective travel of valve pocket, all the time with valve pocket on five pairs of circular holes corresponding one by one, first oil groove, second oil groove and leak oil duct and is connected, the interior oil pressure that rushes down of corresponding body cavity is p
0, the 3rd oil groove is connected with first flow, and corresponding input pressure is p
s, the 4th oil groove communicates with little variable piston cavity, and the 5th oil groove communicates with big variable piston cavity.
Described valve pocket has two ends, wherein end sealing, the other end is provided with opening, and the axle of spool from then on opening stretches out, and is provided with five pairs of circular holes on the valve pocket in addition, in the effective travel of valve pocket, the first pair of circular hole and first oil groove are connected all the time, and the second pair of circular hole and second oil groove are connected all the time, and the 3rd pair of circular hole and the 3rd oil groove are connected all the time, the 4th pair of circular hole and the 4th oil groove are connected all the time, and the 5th pair of circular hole and the 5th oil groove are connected all the time.
Described spool is provided with three place's shaft shoulders, and the axle of spool is divided into three sections, and this three places shaft shoulder is by the wherein axle connection of two sections spools, the axle of other one section spool is a cantilever position, the axle of this section spool is provided with screw thread, and the centre of spool is provided with a through hole, makes part leak oil and leads to body cavity thus.
Under the effect that comes from closed end outside control-oil pressure, valve pocket can axial motion in piston chamber.Spool can be along the valve pocket axial motion, and the valve pocket action of reset spring makes valve pocket be in a limit position at the opening end of valve pocket.
The logical oil return of the piston cavity at big variable piston place, big variable piston is fully retracted the piston cavity at its place, and the oil-feed of the logical oil hydraulic motor of the piston cavity at little variable piston place is at input pressure p
sWith the throw of eccentric maximum that makes eccentric bushing under the effect of little variable piston spring, oil hydraulic motor is in maximum pump discharge.Piston chamber, valve pocket, spool form five oil pockets, and first oil pocket is communicated with second runner, introduce pilot pressure oil p
c, second oil pocket is the dead space that forms between valve pocket, the spool, and the fluid that accumulate the inside can flow into body cavity by the intermediate throughholes of spool, does not have pocketed oil, and it is p that second oil pocket makes little variable piston cavity cut-in pressure
sThe oil hydraulic motor oil-feed or be p to pressure
0Body cavity rush down oil, it is p that the 4th oil pocket makes big variable piston cavity cut-in pressure
sThe oil hydraulic motor oil-feed or be p to pressure
0Body cavity rush down oil, the valve pocket Returnning spring is arranged in the 5th oil pocket, the fluid that accumulates can the matching gap by overhanging poppet shaft on the spool and piston chamber opening flow into body cavity.
The 1st kind of situation of stepless variable of the present invention:
When eccentric bushing is in the maximum eccentric position, the discharge capacity maximum of oil hydraulic motor if reduce discharge capacity, improves the control-oil pressure p that enters first oil pocket by second runner
c, valve pocket overcomes the valve pocket Returnning spring and moves down under the effect of pilot pressure oil, and the valve pocket Returnning spring is squeezed, and up to spring force and the pressure balance that acts on the valve pocket, valve pocket is parked in a new equilibrium position.Because frictional force is very little, the motion of spool is independent of valve pocket, and valve pocket moves down and makes the 4th oil pocket connect the 3rd pair of circular hole, also just has been communicated with the 3rd oil groove, and pressure is p
sThe oil hydraulic motor oil-feed enter big variable piston cavity by the 3rd oil groove, the 3rd pair of circular hole, the 4th oil pocket, the 5th pair of circular hole, the 5th oil groove, big variable piston moves down, the promotion eccentric bushing moves down, throw of eccentric reduces, eccentric bushing drives spool and moves down simultaneously, when eccentric bushing drove spool and moves down into the new equilibrium position at valve pocket place, oil circuit was closed, and the crankshaft connecting rod type oil hydraulic motor just is operated in new equilibrium position.At big variable piston cavity cut-in pressure is p
sThe oil hydraulic motor oil-feed time, little variable piston cavity is p by the 4th oil groove, the 4th pair of circular hole, the 3rd oil pocket, first pair of circular hole, first oil groove to pressure
0Body cavity rush down oil, these 2 oil circuits open and close simultaneously.Because pilot pressure p
cCan set continuously, thus can realize continuously changing the throw of eccentric of crankshaft connecting rod type oil hydraulic motor, even showed stepless variable.
The 2nd kind of situation of stepless variable of the present invention:
When eccentric bushing is in the middle of 1 eccentric position,, then reduce to enter the control-oil pressure p of first oil pocket by second runner if increase the discharge capacity of oil hydraulic motor
c, valve pocket moves under the effect of valve pocket Returnning spring, and spring force reduces, and up to spring force and the pressure balance that acts on the valve pocket, valve pocket is parked in a new equilibrium position.Move on the valve pocket and make the 3rd oil pocket connect the 3rd pair of circular hole, also just be communicated with the 3rd oil groove, pressure is p
sThe oil hydraulic motor oil-feed enter little variable piston cavity by the 3rd oil groove, the 3rd pair of circular hole, the 3rd oil pocket, the 4th pair of circular hole, the 4th oil groove; move on the little variable piston; promote to move on the eccentric bushing; throw of eccentric increases; eccentric bushing drives the spool that connects firmly and moves simultaneously; when eccentric bushing drove the new equilibrium position that moves on to the valve pocket place on the spool, oil circuit was closed, and the crankshaft connecting rod type oil hydraulic motor just is operated in new equilibrium position.At little variable piston cavity cut-in pressure is p
sThe oil hydraulic motor oil-feed time, big variable piston cavity is p by the 5th oil groove, the 5th pair of circular hole, the 4th oil pocket, second pair of circular hole, second oil groove to pressure
0Body cavity rush down oil, these 2 oil circuits open and close simultaneously.
As pilot pressure p
cBe 0 o'clock, the crankshaft connecting rod type oil hydraulic motor is in maximum pump discharge, and when the valve pocket Returnning spring was in maximum compressibility, the crankshaft connecting rod type oil hydraulic motor was in minimum injection rate, and the throw of eccentric of crankshaft connecting rod type oil hydraulic motor eccentric bushing can reduce to 0 in theory.
Shock proof the 1st kind of situation of the present invention:
When the Hydraulic Servo Control device was in 1 stable working position, oil circuit was locked.If the compression shock that this moment, oil hydraulic motor was subjected to is that throw of eccentric is reduced, or large and small variable piston cavity leaks throw of eccentric reduced, and then eccentric bushing moves down, because the relation that machinery connects firmly, spool also moves down, and this has just given the Hydraulic Servo Control device 1 mechanical feedback signal.The relative valve pocket of spool moves down the oil circuit of formation as the 2nd kind of situation of front hydraulic motor stepless variable, and the logical pressure of little variable piston cavity is p
sThe oil hydraulic motor oil-feed, little variable piston promotes to move on the eccentric bushing, moves on the spool, locked again up to oil circuit, oil hydraulic motor is got back to steady-working state.
Shock proof the 2nd kind of situation of the present invention:
If this moment, the compression shock that is subjected to of oil hydraulic motor was that throw of eccentric is increased, then move on the eccentric bushing, because the relation that machinery connects firmly, spool moves on also, this has just given the Hydraulic Servo Control device 1 mechanical feedback signal.The oil circuit that moves formation on the relative valve pocket of spool is as the 1st kind of situation of front hydraulic motor stepless variable, and the logical pressure of big variable piston cavity is p
sThe oil hydraulic motor oil-feed, big variable piston promotes eccentric bushing and moves down, spool moves down, locked again up to oil circuit, oil hydraulic motor is got back to steady-working state.
The invention has the beneficial effects as follows: only increase valve pocket, spool, valve pocket Returnning spring, four parts of nut, eccentric shaft and eccentric bushing are changed a little, and be simple in structure, easy processing, and cost is low.Spool and eccentric bushing link, and the signal that eccentric bushing is under pressure after the disturbance feeds back to the Hydraulic Servo Control device mechanically, make eccentric bushing stable rapidly by hydraulic regulation, and antijamming capability is strong, good reliability.Continuous variation by the external control pressure signal or can realize that with the corresponding electrical signal of this pressure signal the stepless variable that continuously changes the crankshaft connecting rod type low-speed high-torque hydraulic motor discharge capacity regulates, external control pressure oil is by the axle sleeve pressure spring, can realize that the accurate location of stepless variable and the operating mode of crankshaft connecting rod type low-speed high-torque hydraulic motor have nothing to do.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is a Hydraulic Servo Control apparatus structure schematic representation of the present invention
Embodiment
As Fig. 1, shown in Figure 2, the present invention includes: eccentric shaft 1, piston chamber 2, eccentric bushing 3, valve pocket 4, valve pocket Returnning spring 5, spool 6, nut 7, wherein valve pocket 4, valve pocket Returnning spring 5, spool 6, nut 7 is formed the Hydraulic Servo Control device, on eccentric shaft 1, be provided with piston chamber 2, article two, runner 9 and 12, article one, leak oil duct 8, wherein first flow 9 communicates with the filler opening of oil hydraulic motor, first flow 9 by the Hydraulic Servo Control device respectively with eccentric shaft 1 on big variable piston cavity 10; little variable piston cavity 11 links to each other; second runner 12 communicates with the device of the pressure output control oil of oil hydraulic motor; second runner 12 links to each other with the closed end of piston chamber 2; described leakage oil duct 8 communicates with the body cavity 13 of oil hydraulic motor; be provided with valve pocket 4 in piston chamber 2; valve pocket Returnning spring 5; opening end at valve pocket 4 is provided with valve pocket Returnning spring 5; be provided with spool 6 in valve pocket 4; spool 6 passes through on nut 7 and the spool 6 overhanging step and connects with eccentric bushing 3, and the opening end of piston chamber 2 passes through valve pocket Returnning spring 5 and connects with the opening end of valve pocket 4.
The intermediate portion of the cavity inboard of described piston chamber 2 is provided with the oil groove 14,15,16,17,18 of five road annulars, the two ends of piston chamber 2, and wherein end sealing, this end links to each other with second runner 12, and the other end is provided with opening, and this opening is by the axle of spool 6.
Described five road oil grooves 14,15,16,17,18, in the effective travel of valve pocket 4, all the time with valve pocket 4 on five pairs of circular holes 19,20,21,22,23 corresponding one by one, first oil groove 14, second oil groove 15 and leakage oil duct 8 are connected, the 3rd oil groove 16 is connected with first flow 9, the 4th oil groove 17 communicates with little variable piston cavity 11, and the 5th oil groove 18 communicates with big variable piston cavity 10.
Described valve pocket 4 has two ends, wherein end sealing, the other end is provided with opening, and the axle of spool 6 from then on opening stretches out, and is provided with five pairs of circular holes 19,20,21,22,23 on the valve pocket 4 in addition, in the effective travel of valve pocket 4, the first pair of circular hole 19 and first oil groove 14 are connected all the time, and the second pair of circular hole 20 and second oil groove 15 are connected all the time, and the 3rd pair of circular hole 21 and the 3rd oil groove 16 are connected all the time, the 4th pair of circular hole 22 and the 4th oil groove 17 are connected all the time, and the 5th pair of circular hole 23 and the 5th oil groove 18 are connected all the time.
Described spool 6 is provided with three place's shaft shoulders 24, the axle of spool is divided into three sections, and this three places shaft shoulder 24 is by the wherein axle connection of two sections spools 6, and the axle of other one section spool 6 is a cantilever position, the axle of this section spool 6 is provided with screw thread, and the centre of spool 6 is provided with a through hole 25.
Claims (4)
1; The stepless stroking mechanism of a kind of bent axle connecting rod formula low speed high torque hydraulic motor; Comprise: eccentric shaft (1); Guiding valve chamber (2); Eccentric cover (3); It is characterized in that; Also comprise valve pocket (4); Valve pocket back-moving spring (5); Spool (6); Nut (7); Valve pocket (4) wherein; Valve pocket back-moving spring (5); Spool (6); Nut (7) forms hydraulic servo control apparatus; Be provided with guiding valve chamber (2) at eccentric shaft (1); Article two, runner (9; 12); Article one, leak oil duct (8); Wherein first flow (9) communicates with the You Kou that advances of hydraulic pressure motor; First flow (9) by hydraulic servo control apparatus respectively with eccentric shaft (1) on big variable piston chamber (10); Little variable piston chamber (11) links to each other; Second runner (12) communicates with the device of the output control pressure oil of hydraulic pressure motor; Second runner (12) links to each other with the blind end of guiding valve chamber (2); Described leakage oil duct (8) communicates with this body cavity (13) of hydraulic pressure motor; In guiding valve chamber (2), be provided with valve pocket (4); Valve pocket back-moving spring (5); Opening end at valve pocket (4) is provided with valve pocket back-moving spring (5); In valve pocket (4), be provided with spool (6); Spool (6) connects with eccentric overlap (3) by the step of the upper overhanging axle of nut (7) and spool (6), and the opening end of guiding valve chamber (2) passes through valve pocket back-moving spring (5) and connects with the opening end of valve pocket (4); The closed end of the closed end of valve pocket (4) and piston chamber (2) constitutes oil pocket, i.e. first oil pocket, and the pressure oil that the closed end of piston chamber (2) is introduced acts on the closed end of valve pocket (4), makes it can axial motion in piston chamber (2); Spool (6) connects firmly with eccentric bushing (3), and it can be along valve pocket (4) axial motion.
2, crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms according to claim 1 is characterized in that, the intermediate portion of the cavity inboard of described piston chamber (2) is provided with the oil groove of five road annulars (14,15,16,17,18).
3, crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms according to claim 2, it is characterized in that, the oil groove of described five road annulars, i.e. first oil groove (14), second oil groove (15), the 3rd oil groove (16), the 4th oil groove (17), the 5th oil groove (18), in the effective travel of valve pocket (4), all the time with valve pocket (4) on five pairs of circular holes (19,20,21,22,23) corresponding one by one, first oil groove (14), second oil groove (15) is connected with leakage oil duct (8), the 3rd oil groove (16) is connected with first flow (9), the 4th oil groove (17) communicates with little variable piston cavity (11), and the 5th oil groove (18) communicates with big variable piston cavity (10).
4, crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms according to claim 1, it is characterized in that, described spool (6) is provided with three place's shaft shoulders (24), the axle of spool (6) is divided into three sections, this three places shaft shoulder (24) is by the wherein axle connection of two sections spools (6), the axle of other one section spool (6) is a cantilever position, and the axle of this section spool (6) is provided with screw thread, and the centre of spool (6) is provided with a through hole (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100234560A CN1304763C (en) | 2005-01-20 | 2005-01-20 | Crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100234560A CN1304763C (en) | 2005-01-20 | 2005-01-20 | Crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1644936A CN1644936A (en) | 2005-07-27 |
| CN1304763C true CN1304763C (en) | 2007-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100234560A Expired - Fee Related CN1304763C (en) | 2005-01-20 | 2005-01-20 | Crankshaft connecting low-speed big-torsion hydraulic motor stepless variable mechanisms |
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| Country | Link |
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| CN (1) | CN1304763C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339220B (en) * | 2021-07-06 | 2023-09-05 | 翁颇颖 | Eccentric wheel assembly with stepless variable torque adjustment and star-shaped hydraulic pump |
| CN114104971B (en) * | 2021-11-11 | 2023-07-07 | 东风柳州汽车有限公司 | Auxiliary device for overturning cab of truck |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144799A (en) * | 1976-06-25 | 1979-03-20 | Ponchaux Jean Luc | Fluid machine |
| DE3107595A1 (en) * | 1980-03-05 | 1982-07-15 | Veb Industriewerke Karl-Marx-Stadt, Ddr 9030 Karl-Marx-Stadt | Servo and control unit |
| CN85202512U (en) * | 1985-05-29 | 1986-12-24 | 江西省宜春市风动工具厂 | Two-way stepless speed change device of pneumatic winch |
| CN2154383Y (en) * | 1992-06-25 | 1994-01-26 | 建设部长沙建筑机械研究所 | Stepless hydraulic speed variator |
| DE10128431A1 (en) * | 2001-06-12 | 2002-12-19 | Zf Batavia Llc | Radial piston pump for automatic transmission of e.g. motor vehicles has delivery pistons with associated control sleeves moveable in cylinder bores to regulated bore intake and outlet |
| CN2545386Y (en) * | 2002-05-31 | 2003-04-16 | 宁波中意液压马达有限公司 | Axial oil distribution cycloidal hydraulic motor |
| CN2546645Y (en) * | 2002-06-04 | 2003-04-23 | 姜堰市恒威船用辅机制造有限公司 | Static balance oil distribution shaft of hydraulic motor |
-
2005
- 2005-01-20 CN CNB2005100234560A patent/CN1304763C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144799A (en) * | 1976-06-25 | 1979-03-20 | Ponchaux Jean Luc | Fluid machine |
| DE3107595A1 (en) * | 1980-03-05 | 1982-07-15 | Veb Industriewerke Karl-Marx-Stadt, Ddr 9030 Karl-Marx-Stadt | Servo and control unit |
| CN85202512U (en) * | 1985-05-29 | 1986-12-24 | 江西省宜春市风动工具厂 | Two-way stepless speed change device of pneumatic winch |
| CN2154383Y (en) * | 1992-06-25 | 1994-01-26 | 建设部长沙建筑机械研究所 | Stepless hydraulic speed variator |
| DE10128431A1 (en) * | 2001-06-12 | 2002-12-19 | Zf Batavia Llc | Radial piston pump for automatic transmission of e.g. motor vehicles has delivery pistons with associated control sleeves moveable in cylinder bores to regulated bore intake and outlet |
| CN2545386Y (en) * | 2002-05-31 | 2003-04-16 | 宁波中意液压马达有限公司 | Axial oil distribution cycloidal hydraulic motor |
| CN2546645Y (en) * | 2002-06-04 | 2003-04-23 | 姜堰市恒威船用辅机制造有限公司 | Static balance oil distribution shaft of hydraulic motor |
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|---|---|
| CN1644936A (en) | 2005-07-27 |
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Granted publication date: 20070314 Termination date: 20120120 |