CN209164221U - Two-dimentional pulsewidth modulation mechanism - Google Patents
Two-dimentional pulsewidth modulation mechanism Download PDFInfo
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- CN209164221U CN209164221U CN201821732333.3U CN201821732333U CN209164221U CN 209164221 U CN209164221 U CN 209164221U CN 201821732333 U CN201821732333 U CN 201821732333U CN 209164221 U CN209164221 U CN 209164221U
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Abstract
Two-dimentional pulsewidth modulation mechanism, transmission shaft shift fork stir spool by roll wheel assembly, slide axially while so that spool is rotated in valve pocket, valve core rotation with slide axially relatively independent, zero-bit spring is mounted among spool and transmission shaft and in compressive state；Transmission shaft one end connects transmission mechanism；Spool is located in the central through hole of valve pocket；It is control oil groove respectively from left to right that the outer circle of valve pocket, which is set there are four annular groove, goes out oil groove, oil-feed tank and oil-recovery tank, controls on oil groove, goes out on oil groove, is uniformly provided with several identical radial holes on oil-feed tank, on oil-recovery tank；Center spool is axially arranged with center flow channels, and the first circular through hole and the second circular through hole are linked up by center spool runner；It is respectively left triangle oil-distribution port, right triangle oil-distribution port that the staggered triangle oil-distribution port of two column is provided on the second shoulder of spool, and vertex is in the same plane and the plane is perpendicular to valve core axis.
Description
Technical field
The utility model belongs to Fluid-transmission and control correlative technology field, is related to a kind of two-dimensional pressure feedback flow flow
Mechanism more particularly to a kind of two-dimentional pulsewidth modulation mechanism.
Background technique
During the work time, plunger moves reciprocatingly plunger pump in cylinder body, causes the variation of seal operation volume with reality
Existing oil suction and oil extraction.Each plunger cavity of axial plunger pump periodically toggles between inlet port and oil discharge outlet,
The handoff procedure needs of hydraulic fluid port are realized by the flow-distribution mechanism of pump.
According to flow mode, axial plunger pump is broadly divided into Flat valve and valve plate distribution.Flat valve mainly leans on check valve
Realize that flow, two check valves are separately mounted to the oil inlet and outlet of pump, plunger cavity opens corresponding hydraulic fluid port in the suction oily stage respectively
Check valve, thus realize suction oil.Flat valve mode does not need cylinder body rotation, is generally used for single plunger pump.Check valve has one
Fixed cracking pressure, there are certain hysteresis qualitys for response, so that the suction capacity of pump is poor, be easy to cause cavitation erosion, restrictive pump turns
Speed.Valve plate distribution is the main flow mode of current plunger pump, which, which requires the cylinder body of plunger pump to rotate, makes plunger cavity
With the oil sucking window and oil extraction window alternate communication on valve plate, suction oil is carried out.Plunger pump cylinder body has multiple plunger holes, cylinder body
It is relatively large in diameter, this rubs to key and secondary needs higher design requirement to cylinder body and valve plate for high pressure, high revolving speed；In order to reduce
The starting time of motor increases the response speed of system, and traditional method is to install unloading valve in the outlet of hydraulic pump, this just increases
The big complexity of mechanical system and Control System Design, processing.
Existing two dimension (2D) pump is all made of the valve groups such as two-dimentional unloading valve, two-dimentional pressure maintaining valve to realize the tune of pressure and flow
Section, components are more, and more at control and regulation, press and flux pulsation is larger.
Summary of the invention
In order to overcome the Flat valve of plunger pump, valve plate distribution to cause, it is poor from absorption, revolving speed is low, diameter of cylinder is big, friction
The problems such as secondary technical requirements are high, mechanical system and control system are more complex is adjusted and also to which existing two-dimentional (2D) is overcome to pump
The deficiency of multiple hydraulic Flat valve modes, the utility model provide a kind of structure novel it is compact, it is small in size, light-weight, transmission letter
List realizes that the two-dimensional pressure feedback flow of flow is matched without friction pair, the high revolving speed of Yi Shixian high pressure, using spool double freedom structure
Mechanism is flowed, for two-dimentional pulsewidth modulation mechanism.The utility model had both solved the disadvantage that plunger pump flow and deficiency, also easy, excellent
The flow-distribution mechanism of two-dimentional (2D) pump is changed, while the unloading valve of hydraulic pump outlet can be saved, hydraulic pump can be real in hydraulic system
Existing zero voltage starting, is suitable for the flows such as hydraulic pump, motor.
The technical solution adopted in the utility model is as follows:
The two dimension pulsewidth modulation mechanism, it is characterised in that: including transmission shaft, zero-bit spring, roller shaft, left wheel group
Part, right roll wheel assembly, preceding concentric ring, spool, valve pocket, rear concentric ring, spool screw plug.Transmission shaft shift fork and roll wheel assembly cooperation are logical
It crosses roller shaft and stirs spool, slide axially while so that spool is rotated in valve pocket, valve core rotation and the phase that slides axially
To independence, preceding concentric ring and rear concentric ring are respectively fixedly connected at valve pocket both ends, zero-bit spring be mounted among spool and transmission shaft and
In compressive state.
Described transmission shaft one end is cylindrical end, connects transmission mechanism；The transmission shaft other end is door frame, connects two U-shapeds
Shift fork, shift fork face are axially extending imperfect cylindrical surface track, cooperate roll left wheel assembly, right roll wheel assembly, spool is made to do week
To rotation while slide axially；Transmission shafts have a circular groove to intermediate end face, are used for fixed zero spring.
Two planar end surface of zero-bit spring is separately fixed at transmission shaft circular groove and spool left end multi-diameter shaft, zero-bit bullet
Spring initially and in the course of work is in compressive state, guarantees that original state spool is in right end, keeps spool zero-bit.
The roller shaft is a ladder cylindrical shaft, and there is a shoulder in centre, and intermediate cylindrical diameter is greater than both sides body diameter；In
Between the insertion of shoulder axis spool left end cylindrical hole and be connected, two end axles are inserted into the wheel assembly that rolls left, right roll wheel assembly center hole respectively
And it is connected.
The right roll wheel assembly is identical with left wheel modular construction, including bearing holder (housing, cover), deep groove ball bearing, outside bearing holder (housing, cover)
Portion is spherical surface, and inside is circular hole, and both ends are planar end surface, and bearing holder (housing, cover) inner hole sleeve is in deep groove ball bearing outer circle and is connected, bearing holder (housing, cover) ball
Face and transmission shaft U-shaped shift fork cylindrical surface cooperate.
The preceding concentric ring is circular ring shape, and both ends of the surface are plane, and preceding concentric ring outer circle and valve pocket are connected, and inner hole sleeve is in spool
In left end shaft.
Concentric ring is circular ring shape after described, and both ends of the surface are plane, and it is the second circular through hole of spool that inner hole, which has a stepped hole,
Avoiding space is provided, rear concentric ring outer circle and valve pocket are connected, and inner hole sleeve is on spool right end axis.
The valve pocket inner hole is that center through-hole and spool cooperate, and there are preceding stepped hole and rear stepped hole in both ends respectively, respectively with
Preceding concentric ring, rear concentric ring are connected；The outer circle of valve pocket set there are four annular groove from left to right respectively be control oil groove, go out oil groove,
Oil-feed tank and oil-recovery tank control and are uniformly provided with several identical radial control oilholes on oil groove, if being uniformly provided on oil groove out
Identical radial oil outlet is done, several identical radial diamond shape oil-distribution ports, diamond shape flow window are uniformly provided on oil-feed tank
Mouthful vertex in the same plane and the plane is perpendicular to valve core axis, several identical radial return is uniformly provided on oil-recovery tank
Oilhole.
The spool left end has a multi-diameter shaft, and it is logical to be equipped with roller shaft circle for installing zero-bit spring, on the right side of multi-diameter shaft
Hole is connected with roller shaft, for making valve core rotation to spool transmitting torque；Spool successively has first there are three shoulder from left to right
Shoulder, the second shoulder and third shoulder, the poppet shaft between first shoulder and the second shoulder are radially provided with the first circular through hole, lean on
The poppet shaft of nearly third shoulder right side is radially provided with the second circular through hole, and center spool is axially arranged with center flow channels, center stream
Road junction is blocked with spool screw plug, and the first circular through hole and the second circular through hole are linked up by center spool runner；Spool second
It is respectively left triangle oil-distribution port, right triangle oil-distribution port, top that the staggered triangle oil-distribution port of two column is provided on shoulder
Point is in the same plane and the plane is perpendicular to valve core axis.
Preferably, the outer Surface of Sphere of the bearing holder (housing, cover) and transmission shaft U-shaped shift fork are clearance fit, single edge contact when stress, energy
Realize positive and negative rotation, transmission shaft drives valve core rotation by the wheel assembly that rolls left, right roll wheel assembly and roller shaft, and spool is in hydraulic masterpiece
It slides axially under, drives bearing holder (housing, cover) axial rolling on transmission shaft U-shaped shift fork.
Preferably, preceding stepped hole and rear rank in valve pocket both ends of the surface is respectively fixedly connected in the preceding concentric ring and rear concentric ring outer circle
In terraced hole, preceding concentric ring inner hole sleeve in spool left end shaft, be clearance seal, rear concentric ring inner hole sleeve on spool right end axis,
For clearance seal.
Preferably, the spool can be rotatably set in valve pocket, and preceding concentric ring and spool first shoulder are by valve pocket inner cavity
Sealing forms control cavity, and control cavity is linked up by control oilhole and control oil groove, the logical control pressure oil of control oil groove；Spool
By valve pocket bore seal formation high-pressure chamber, high-pressure chamber is logical by oil outlet and fuel-displaced groove for first shoulder and the second shoulder,
It is linked up simultaneously by diamond shape oil-distribution port and oil-feed tank, oil-feed tank leads to hydraulic pump high pressure oil, out oil groove way system oil circuit；Spool
By valve pocket bore seal formation low pressure cavity, low pressure cavity is linked up by oil return hole and oil-recovery tank, is returned for two shoulders and third shoulder
Oil groove leads to low-pressure reservoir；Spool third shoulder and rear concentric ring, which form valve pocket bore seal, feeds back cavity, and feedback cavity passes through
The first circular through hole of spool, center flow channels, the second circular through hole and high-pressure chamber are linked up, and two cavity pressures are identical；Valve pocket control oil
Slot, oil groove, oil-feed tank and oil-recovery tank are not linked up mutually outside valve pocket out.The staggered triangle of two column is provided on the second shoulder of spool
Oil-distribution port, respectively left triangle oil-distribution port, right triangle oil-distribution port, valve pocket diamond shape oil-distribution port are located at spool second
On the motion profile of shoulder, spool slides axially under action of hydraulic force while uniform rotation in valve pocket, makes a spool left side three
Angular oil-distribution port, right triangle oil-distribution port change with valve pocket diamond shape oil-distribution port flow time accounting respectively, thus
Change oil stream amount out and realizes flow flow.
Specific work process is as follows:
Spool uniform rotation under transmission shaft drive, the staggered triangle flow window of two column that the second shoulder of spool is equipped with
Mouth has circumferentially opposed rotation with valve pocket slot diamond shape oil-distribution port；Fluid pressure acts on spool first shoulder left end in control cavity
Axial thrust to the right is generated to spool on the annulus area of face, fluid pressure in cavity is fed back and acts on spool third shoulder right side
Axial thrust to the left is generated to spool on annulus area, zeroing spring is compressed to generate axial thrust to the right to spool, if
Axial thrust to the left is greater than to the axial thrust to the right of spool and the resultant force of spring force, spool axially slides to the right, if to poppet shaft
It is less than axial thrust to the left to thrust to the right and the resultant force of spring force, spool axially slides to the left.When spool both ends dynamic balance,
Spool rests on a certain operating position of valve pocket, with valve core rotation, spool left triangle oil-distribution port, right triangle oil-distribution port
Replace communication with valve pocket diamond shape oil-distribution port in cyclically-varying, because of spool or so triangle oil-distribution port and valve pocket diamond shape flow
There are many number of windows, and valve port area gradient is very big, so that the size of valve port opening passes through the flow effect very little for passing through valve port
The flow of valve port may be considered one it is unrelated with valve port opening and time related amount is only opened with valve port, i.e., in any period
The time required to triangle oil-distribution port, right side triangle oil-distribution port replace inswept valve pocket diamond shape oil-distribution port respectively on the left of spool
The ratio of total time is accounted for respectively, is the distribution ratio of oil inlet flow, out oil stream amount and return flow in this ratio progress assignment of traffic.
When spool is in zero-bit, spool is in right end in valve pocket, and valve pocket oil-feed tank is linked up with oil groove maximum out, into
Oil groove is not linked up with oil-recovery tank, and guarantee system is before establishing pressure, and the high pressure oil of pump all flows into system, so as to the fast run-up of system
Vertical pressure, until system pressure stability of flow, spool is in equilibrium state.When spool is in left end in valve pocket, valve pocket
Oil-feed tank is not linked up with oil groove out, and oil-feed tank and oil-recovery tank maximum are linked up, and the high pressure oil of pump all flows into fuel tank, and hydraulic pump is in
Unloading condition；At this point, system is in state of pressure keeping, and when hydraulic pump starting with pressure again, valve pocket goes out if hydraulic pump stops working
Oil groove is directly linked up with oil-recovery tank, i.e., the oil outlet of hydraulic pump is directly linked up with fuel tank, and liquid can be achieved in system pressure maintaining
Almost zero load starts press pump.
When control chamber pressure is constant, system pressure is constant, system requirements flow changes, phase occurs for system pressure
Minor change is answered, generates corresponding change so as to cause high-pressure chamber and feedback chamber pressure, spool is in axial force action lower axle
To sliding, and spool slides axially and spool left triangle oil-distribution port, right triangle oil-distribution port is caused to replace inswept valve respectively
Corresponding change occurs for the ratio for accounting for total time the time required to set diamond shape oil-distribution port respectively, and oil stream amount and return flow occur corresponding out
Corresponding change occurs for variation, the flow into system, and corresponding change occurs for the pressure for feeding back cavity, puts down until spool reaches new
Weighing apparatus state；When needing to change system pressure, change control chamber pressure, spool slides axially under axial force action, valve
Core left triangle oil-distribution port, right triangle oil-distribution port account for respectively the time required to replacing inswept valve pocket diamond shape oil-distribution port respectively
Corresponding change occurs for the ratio of total time, and corresponding change occurs for oil stream amount and return flow out, and the flow into system occurs accordingly
Corresponding change occurs for variation, feedback chamber pressure, until system pressure increases, and spool reaches when the axial resultant force of spool balances again
To new equilibrium state.
Sliding axially for spool changes flow time accounting, to change the oil liquid flow into hydraulic system.Cause
This, by this structure flow system flow is adjusted in the way of can be regarded as by spool position control pulsewidth modulation.Due to
Valve core rotation speed quickly, and spool circumference be equipped with many triangle oil-distribution ports, valve pocket circumference be equipped with corresponding diamond shape match
Window is flowed, so that the frequency of pulsewidth modulation is very high, pressure fluctuation and flow pulsation are almost not reflected in systems.
The spool double freedom structure refers to can slide axially while spool circumferentially rotates, and spool circumferentially rotate and
It slides axially mutually indepedent；Valve core rotation is caused by outer torque passes to spool torque by transmission shaft, and spool slides axially
It is caused by spool both ends stress is different.
The axial direction refers to center spool axis place or the direction for being parallel to center spool axis；The radial direction refers to hanging down
Directly in the direction where center spool axis；The circumferential direction refers to spool around the direction where center axis rotation.
The spool left triangle oil-distribution port, right triangle oil-distribution port replace inswept valve pocket diamond shape oil-distribution port respectively
Required time refers to that any period inner spool left triangle oil-distribution port, right triangle oil-distribution port are matched with valve pocket diamond shape respectively
Window is flowed from the time of coincidence for being opened to closing.
The beneficial effects of the utility model are embodied in:
1, conventional spool valves structure is used for reference, using the novel flow mode of the double free structures of spool, structure is simple, and performance can
Lean on, spool axially has pressure feedback, can simultaneously regulating system pressure and output flow.
2, Spool rotating makes the frequency of pulsewidth modulation very high, greatly improves pressure in system, flow pulsation.
3, flow is controlled instead of two-dimentional (2D) pump valve group before, reduces regulating mechanism, simplifies design.
4, the valve plate distribution of more traditional plunger pump eliminates friction auxiliary structure, reduces abrasion, improves efficiency.
5, being able to achieve hydraulic pump, almost zero load starts in high-pressure system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of two-dimentional pulsewidth modulation mechanism.
Fig. 2 is the structural schematic diagram of valve pocket.
Fig. 2 a is the C-C sectional view of Fig. 2.
Fig. 3 is the structural schematic diagram of spool.
Fig. 3 a is the D-D sectional view of Fig. 3.
Fig. 4 is the structural schematic diagram of transmission shaft.
Fig. 5 is the structural schematic diagram of right roll wheel assembly.
Fig. 6 is the structural schematic diagram of roller shaft.
Fig. 7 a is valve pocket oil-distribution port schematic illustration.
Fig. 7 b is spool oil-distribution port schematic illustration.
Assignment of traffic schematic illustration when Fig. 7 c is position in spool.
Assignment of traffic schematic illustration when Fig. 7 d moves down for spool.
Specific embodiment
The technical solution of the utility model is further illustrated referring to Fig. 1 to Fig. 7 d.
The two dimension pulsewidth modulation mechanism, it is characterised in that: by transmission shaft 1, zero-bit spring 2, roller shaft 3, left wheel group
Part 4, right roll wheel assembly 5, preceding concentric ring 6, valve pocket 7, spool 8, rear concentric ring 9, spool screw plug 10 form.1 shift fork of transmission shaft with
Roll left wheel assembly 4, right roll wheel assembly 5 fits through roller shaft 3 and stirs spool 8, and spool 8 is made to rotate in valve pocket 7
It slides axially simultaneously, spool 8 rotates and slides axially relatively independent, and preceding concentric ring 6 and rear concentric ring 9 are respectively fixedly connected in valve pocket 7
Both ends, zero-bit spring 2 are mounted among spool 8 and transmission shaft 1 and in compressive state.
Described 1 one end of transmission shaft is cylindrical end, connects transmission mechanism, rotates transmission shaft 1；1 other end of transmission shaft is door
Frame shape connects two U-shaped shift forks, and shift fork face is axially extending imperfect cylindrical surface track, cooperates roll left wheel assembly 4 and right rolling
Wheel assembly 5 makes spool 8 slide axially while rotating；There is a circular groove in the axial intermediate end face of transmission shaft 1, is used for
Fixed zero spring 2.
Two planar end surfaces of the zero-bit spring 2 are separately fixed at 8 left end multi-diameter shaft of 1 groove of transmission shaft and spool, zero-bit
Spring 2 initially and in the course of work is in compressive state, guarantees that original state spool 8 is in right end, keeps spool 8 zero
Position.
The roller shaft 3 is a ladder cylindrical shaft, and there is a shoulder in centre, and intermediate cylindrical diameter is greater than both sides body diameter；
Intermediate shoulder axis insertion 8 left end cylindrical hole of spool is simultaneously connected, and two end axles are inserted into the wheel assembly 4 that rolls left, in right roll wheel assembly 5 respectively
Heart circular hole is simultaneously connected.
The right roll wheel assembly 5 is identical with 4 structure of wheel assembly that rolls left, including bearing holder (housing, cover) 51, deep groove ball bearing 52, axis
It is spherical surface outside bearing sleeve 51, inside is circular hole, and both ends are planar end surface, and 51 inner hole sleeve of bearing holder (housing, cover) is in 52 outer circle of deep groove ball bearing and consolidates
Even, the U-shaped shift fork cylindrical surface of 51 spherical surface of bearing holder (housing, cover) and transmission shaft 1 cooperates.
The preceding concentric ring 6 is circular ring shape, and both ends of the surface are plane, and preceding 6 outer circle of concentric ring and valve pocket 7 are connected, and inner hole sleeve exists
In 8 left end shaft of spool.
Concentric ring 9 is circular ring shape after described, and both ends of the surface are plane, and inner hole has the second circle that a stepped hole is spool 8 logical
Hole B2 provides avoiding space, and rear 9 outer circle of concentric ring and valve pocket 7 are connected, and inner hole sleeve is on 8 right end axis of spool.
7 inner hole of valve pocket is that center through-hole and spool 8 cooperate, and there are preceding stepped hole and rear stepped hole in both ends respectively, respectively
It is connected with preceding concentric ring 6, rear concentric ring 9；Outer circle set there are four annular groove from left to right respectively be control oil groove K, go out oil groove A,
Oil-feed tank P and oil-recovery tank T is controlled and is uniformly provided with several identical radial control oilhole k on oil groove K, uniformly sets on oil groove A out
There are several identical radial oil outlet a, several identical radial diamond shape oil-distribution port p, diamond shape are uniformly provided on oil-feed tank P
The vertex of oil-distribution port p is in the same plane and the plane is perpendicular to valve core axis, is uniformly provided on oil-recovery tank T several identical
Radial oil return hole t1.
8 left end of spool has a multi-diameter shaft, for installing zero-bit spring 2, has roller shaft circle logical on the right side of multi-diameter shaft
Hole is connected with roller shaft 3, rotates spool 8 for transmitting torque to spool 8；Spool 8 successively has from left to right there are three shoulder
First shoulder 81, the second shoulder 82 and third shoulder 83, the poppet shaft between first shoulder 81 and the second shoulder 82 are radially provided with
First circular through hole B1, the poppet shaft close to 83 right side of third shoulder are radially provided with the second circular through hole B2,8 central axis of spool
To center flow channels B is equipped with, center flow channels mouth spool screw plug 10 is blocked, and the first circular through hole B1 and the second circular through hole B2 pass through
8 center flow channels B of spool is linked up；The staggered triangle oil-distribution port of two column, respectively left triangle are provided on 8 second shoulder 82 of spool
Shape oil-distribution port p1, right triangle oil-distribution port p2, vertex is in the same plane and the plane is perpendicular to valve core axis.
The U-shaped shift fork of the outer Surface of Sphere of the bearing holder (housing, cover) 51 and transmission shaft 1 is clearance fit, single edge contact when stress, can be real
Existing positive and negative rotation, transmission shaft 1 are rotated by the wheel assembly 4 that rolls left, right roll wheel assembly 5 and roller shaft 3 with movable valve plug 8, and spool 8 is hydraulic
It slides axially under power effect, drives the axial rolling on the U-shaped shift fork of transmission shaft 1 of bearing holder (housing, cover) 51.
Preceding stepped hole and rear stepped hole in 7 both ends of the surface of valve pocket is respectively fixedly connected in the preceding concentric ring 6 and 9 outer circle of rear concentric ring
It is interior, preceding 6 inner hole sleeve of concentric ring in 8 left end shaft of spool, be clearance seal, rear 9 inner hole sleeve of concentric ring on 8 right end axis of spool,
For clearance seal.
The spool 8 can be rotatably set in valve pocket 7, and preceding concentric ring 6 is close by 7 inner cavity of valve pocket with spool first shoulder 81
Envelope forms control cavity K1, and control cavity K1 is linked up by control oilhole k and control oil groove K, the logical control pressure of control oil groove K
Oil；8 first shoulder 81 of spool and the second shoulder 82 pass through the formation of 7 bore seal of valve pocket high-pressure chamber A1, high-pressure chamber A1 out
Oilhole a is linked up with oil groove A out, while being linked up by diamond shape oil-distribution port p and oil-feed tank P, and oil-feed tank P leads to hydraulic pump high pressure oil,
Oil groove A way system oil circuit out；7 bore seal of valve pocket is formed low pressure cavity T1 with third shoulder 83 by 8 second shoulder 82 of spool, low
Pressure-volume chamber T1 is linked up by oil return hole t1 and oil-recovery tank T, and oil-recovery tank T leads to low-pressure reservoir；8 third shoulder 83 of spool and rear concentric ring
7 bore seal of valve pocket is formed feedback cavity A2 by 9, and feedback cavity A2 passes through 8 first circular through hole B1 of spool, center flow channels B, the
Two circular through hole B2 and high-pressure chamber A1 are linked up, and two cavity pressures are identical；Valve pocket controls oil groove K, goes out oil groove A, oil-feed tank P and oil return
Slot T is not linked up mutually outside valve pocket.The staggered triangle oil-distribution port of two column is provided on 8 second shoulder 82 of spool, it is respectively left
Triangle oil-distribution port p1, right triangle oil-distribution port p2,7 diamond shape oil-distribution port p of valve pocket are located at the fortune of 8 second shoulder 82 of spool
On dynamic rail mark, spool 8 slides axially under action of hydraulic force while uniform rotation in valve pocket 7, matches 8 left triangle of spool
Stream window p1, right triangle oil-distribution port p2 change with 7 diamond shape oil-distribution port p flow time accounting of valve pocket respectively, thus
Change oil stream amount out and realizes flow flow.
The working principle of the present embodiment:
The uniform rotation under the drive of transmission shaft 1 of spool 8, the staggered left triangle that 8 second shoulder 82 of spool is equipped with
Shape oil-distribution port p1, right triangle oil-distribution port p2 and 7 diamond shape oil-distribution port p of valve pocket have circumferentially opposed rotation；Control cavity K1
Interior fluid pressure acts on 8 first shoulder of spool, 81 left side annulus area S1 and generates axial thrust to the right, feedback to spool 8
In cavity A2 fluid pressure act on 8 third shoulder of spool, 83 right side annulus area S2 to spool 8 generate it is axial to the left
Thrust, zeroing spring 2 is compressed to generate axial thrust to the right to spool 8, if to the axial thrust to the right of spool 8 and spring force
Resultant force is greater than axial thrust to the left, i.e. 8 left end of spool resultant force is greater than right end resultant force, and spool 8 is axial to be slided to the right, if to spool 8
Axial thrust to the right and the resultant force of spring force are less than axial thrust to the left, i.e. 8 left end of spool resultant force is less than right end resultant force, spool 8
It is axial to slide to the left, if being equal to axial thrust, i.e. 8 left end of spool to the left to the axial thrust to the right of spool 8 and the resultant force of spring force
Resultant force is equal to right end resultant force, and spool 8 keeps axial position motionless, is equilibrium state.
In order to illustrate the flow principle of the two-dimentional pulsewidth modulation mechanism, by 8 left triangle oil-distribution port p1 of spool, the right side three
Angular oil-distribution port p2, the expansion of 7 diamond shape oil-distribution port p circumference of valve pocket, are reduced to schematic diagram, such as Fig. 7 a, Fig. 7 b, Fig. 7 c, Fig. 7 d.
Spool circumferentially rotates in spool or so linear motion representative structure schematic diagram in schematic illustration, in schematic illustration above and below spool
Spool in representative structure schematic diagram is vertically moved to slide axially.In Fig. 7 a, Fig. 7 b, P0 is oil inlet, and equivalent oil-feed tank P, A0 are
Oil outlet, equally out oil groove A, T0 are oil return openings, equivalent oil-recovery tank T.
Spool 8 can be freely rotated and slide axially in valve pocket 7, as spool 8 rotates, 8 left triangle flow of spool
Window p1, right triangle oil-distribution port p2 replace communication with 7 diamond shape oil-distribution port p of valve pocket in cyclically-varying, because of spool 8 or so
There are many triangle oil-distribution port p1, p2 and 7 diamond shape oil-distribution port p quantity of valve pocket, and valve port area gradient is very big, so that valve port opening
Size to by the flow effect very little of valve port, by the flow of valve port may be considered one it is unrelated with valve port opening only
Time related amount, i.e., any 8 left triangle oil-distribution port p1 of period inner spool, right triangle oil-distribution port p2 are opened with valve port
The ratio for accounting for total time the time required to replacing inswept 7 diamond shape oil-distribution port p of valve pocket respectively respectively, is the distribution ratio of oil inlet flow, out
Oil stream amount and return flow are in this ratio progress assignment of traffic；
Such as Fig. 7 c, Fig. 7 d, if ordinate is flow Q, the abscissa time t of oil inlet P 0, in any cycle time Δ t,
Δ t1 the time required to 8 left triangle oil-distribution port p1 of spool is inswept valve pocket, 7 diamond shape oil-distribution port p, 8 right triangle flow window of spool
Δ t2 the time required to mouthful p2 is inswept 7 diamond shape oil-distribution port p of valve pocket, the flow of oil outlet A0 is Q Δ t1/ Δ t, oil return inlet T 0
Flow is Q Δ t2/ Δ t.Compare Fig. 7 c, Fig. 7 d can be seen that sliding axially for spool and change the accounting of Δ t1 and Δ t2,
To change oil liquid flow into hydraulic system, therefore, by this structure flow system flow is adjusted in the way of can see
Do the pulsewidth modulation controlled by spool position.Quickly due to 8 velocity of rotation of spool, and 8 circumference of spool is equipped with many left and right three
Angular oil-distribution port p1, p2,7 circumference of valve pocket is equipped with corresponding diamond shape oil-distribution port p, so that the frequency of pulsewidth modulation is very high, pressure
Power pulsation and flow pulsation are almost not reflected in systems.
When spool 8 is in zero-bit, spool 8 is in right end, oil inlet P 0 and oil outlet A0 most major groove in valve pocket 7
Logical, oil inlet P 0 is not linked up with oil return inlet T 0, and for guarantee system before establishing pressure, the high pressure oil of hydraulic pump all flows into system,
In order to which system quickly establishes pressure, when system pressure stability of flow, spool is in equilibrium state.When spool 8 is in valve pocket 7
Interior when being in left end, oil inlet P 0 is not linked up with oil outlet A0, oil inlet P 0 and the maximum communication of oil return inlet T 0, the height of hydraulic pump
Pressure oil all flows into fuel tank, and hydraulic pump is in unloading condition；At this point, system is in state of pressure keeping if hydraulic pump stops working, when
Hydraulic pump again starting with pressure when, oil inlet P 0 directly with oil return inlet T 0 link up, i.e., the oil outlet of hydraulic pump directly with fuel tank ditch
Logical, hydraulic pump can be achieved under system state of pressure keeping, and almost zero load starts.
If control pressure is constant, system pressure is constant, system requirements flow changes, system pressure also occurs therewith
Minor change.When system requirements flow increases, system pressure is reduced, then high-voltage oil cavity A1 and feedback cavity A2 pressure reduction, control
Cavity K1 pressure processed is constant, and the equilibrium state of spool 8 is broken, and 8 left end of spool resultant force is greater than right end resultant force, spool 8 it is axial to
Right sliding, oil inlet P 0 and oil outlet A0 aperture increase at this time, and oil inlet P 0 and 0 aperture of oil return inlet T reduce, the left triangle of spool 8
Shape oil-distribution port p1 is inswept, and the 7 diamond shape oil-distribution port p time of valve pocket is elongated, 8 right triangle oil-distribution port p2 of spool is inswept 7 water chestnut of valve pocket
The shape oil-distribution port p time shortens, and oil outlet A0 flow becomes larger to be energized for system, restores until system pressure increases to original pressure
Power, high-pressure chamber A1 and feedback cavity A2 pressure rise restore to original pressure, and 8 left end of spool resultant force is equal to right end resultant force, valve
Core 8 reaches equilibrium state again.Opposite, when system requirements flow reduces, system pressure is increased, then high-voltage oil cavity A1 and feedback
Cavity A2 pressure rise, control cavity K1 pressure is constant, and the equilibrium state of spool 8 is broken, and 8 left end of spool resultant force is less than right end
With joint efforts, spool 8 is axial slides to the left, and oil inlet P 0 and oil outlet A0 aperture reduce at this time, oil inlet P 0 and 0 aperture of oil return inlet T
Increase, 8 left triangle oil-distribution port p1 of spool is inswept, and the 7 diamond shape oil-distribution port p time of valve pocket shortens, 8 right triangle flow of spool
Window p2 is inswept, and the 7 diamond shape oil-distribution port p time of valve pocket is elongated, and 0 flow of oil return inlet T becomes larger and more oil liquid is made to flow back to fuel tank, fuel-displaced
Mouth A0 flow becomes smaller, and flows into flow system flow and becomes smaller until system pressure reduces recovery to original pressure, high-pressure chamber A1 and feedback
Cavity A2 pressure reduction restores to original pressure, and 8 left end of spool resultant force is equal to right end resultant force, and spool 8 reaches equilibrium state again.
If desired change system pressure, only need to change control port pressure value, break the original equilibrium state of spool and build
Found new equilibrium state.When controlling cavity K1 pressure rise, 8 left end of spool resultant force is greater than right end resultant force, and spool 8 is axial
It slides to the right, oil inlet P 0 becomes larger with oil outlet A0 aperture at this time, and oil inlet P 0 and 0 aperture of oil return inlet T become smaller (until closing completely
Close), oil outlet A0 pressure increases and increases with entering system oil flow quantity, when 8 both ends of spool are equal again with joint efforts
It waits, spool reaches new equilibrium state.When controlling cavity K1 pressure reduction, 8 left end of spool resultant force is less than right end resultant force, spool
8 axially slide to the left, and oil inlet P 0 and oil outlet A0 aperture become smaller (until completely closing) at this time, oil inlet P 0 and oil return inlet T 0
Aperture becomes larger, and oil outlet A0 pressure is reduced with the reduction of system oil flow quantity is entered, and until 8 both ends of spool, resultant force is equal again
When, spool reaches new equilibrium state.
8 first shoulder of reasonable set spool, 81 left side annulus area S1,8 third shoulder of spool, 83 right side annulus area
The size relation of S2 and zero-bit spring rate can establish the two-dimentional pulsewidth modulation mechanism outlet pressure and control port pressure
Proportionate relationship, exit pressure levels are set up by the value of change control port pressure to realize, to reach to being
The adjusting of system pressure flow.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, the utility model
Protection scope should not be construed as being limited to the specific forms stated in the embodiments, and the protection scope of the utility model is also and in this
Field technical staff conceive according to the present invention it is conceivable that equivalent technologies mean.
Claims (4)
1. two-dimentional pulsewidth modulation mechanism, it is characterised in that: including transmission shaft, zero-bit spring, roller shaft, the wheel assembly that rolls left, right rolling
Wheel assembly, preceding concentric ring, spool, valve pocket, rear concentric ring, spool screw plug；Transmission shaft shift fork and roll wheel assembly fit through idler wheel
Axis stirs spool, slides axially while so that spool is rotated in valve pocket, valve core rotation with slide axially it is relatively independent,
Preceding concentric ring and rear concentric ring are respectively fixedly connected at valve pocket both ends, and zero-bit spring is mounted among spool and transmission shaft and in compression
State；
Described transmission shaft one end is cylindrical end, connects transmission mechanism；The transmission shaft other end is door frame, connects two U-shaped shift forks,
Shift fork face is axially extending imperfect cylindrical surface track, cooperates roll left wheel assembly, right roll wheel assembly, spool is made to rotate in a circumferential direction
While slide axially；Transmission shafts have a circular groove to intermediate end face, are used for fixed zero spring；
Two planar end surface of zero-bit spring is separately fixed at transmission shaft circular groove and spool left end multi-diameter shaft, at the beginning of zero-bit spring
Begin and be in compressive state in the course of work, guarantees that original state spool is in right end, keep spool zero-bit；
The roller shaft is a ladder cylindrical shaft, and there is a shoulder in centre, and intermediate cylindrical diameter is greater than both sides body diameter；Way station
Shoulder axis insertion spool left end cylindrical hole is simultaneously connected, and two end axles are inserted into the wheel assembly that rolls left, right roll wheel assembly center hole respectively and are consolidated
Even；
The right roll wheel assembly is identical with left wheel modular construction, including bearing holder (housing, cover), deep groove ball bearing, is outside bearing holder (housing, cover)
Spherical surface, inside be circular hole, both ends are planar end surface, and bearing holder (housing, cover) inner hole sleeve is in deep groove ball bearing outer circle and is connected, bearing holder (housing, cover) spherical surface with
The cooperation of transmission shaft U-shaped shift fork cylindrical surface；
The preceding concentric ring is circular ring shape, and both ends of the surface are plane, and preceding concentric ring outer circle and valve pocket are connected, and inner hole sleeve is in spool left end
On axis；
Concentric ring is circular ring shape after described, and both ends of the surface are plane, and inner hole has a stepped hole to provide for the second circular through hole of spool
Avoiding space, rear concentric ring outer circle and valve pocket are connected, and inner hole sleeve is on spool right end axis；
The valve pocket inner hole is that center through-hole and spool cooperate, and there are preceding stepped hole and rear stepped hole in both ends respectively, respectively with it is preceding same
Thimble, rear concentric ring are connected；It is control oil groove respectively from left to right that the outer circle of valve pocket, which is set there are four annular groove, goes out oil groove, oil inlet
Slot and oil-recovery tank control and are uniformly provided with several identical radial control oilholes on oil groove, be uniformly provided with several phases on oil groove out
With radial oil outlet, be uniformly provided with several identical radial diamond shape oil-distribution ports on oil-feed tank, diamond shape oil-distribution port
Vertex is in the same plane and the plane is perpendicular to valve core axis, is uniformly provided with several identical radial oil returns on oil-recovery tank
Hole；
The spool left end has a multi-diameter shaft, and for installing zero-bit spring, multi-diameter shaft right side is equipped with roller shaft circular through hole, with
Roller shaft is connected, for making valve core rotation to spool transmitting torque；Spool there are three shoulder successively have from left to right first shoulder,
Second shoulder and third shoulder, the poppet shaft between first shoulder and the second shoulder are radially provided with the first circular through hole, close to the
The poppet shaft of three shoulder right sides is radially provided with the second circular through hole, and center spool is axially arranged with center flow channels, center flow channels mouth
It is blocked with spool screw plug, the first circular through hole and the second circular through hole are linked up by center spool runner；On the second shoulder of spool
Being provided with the staggered triangle oil-distribution port of two column is respectively left triangle oil-distribution port, right triangle oil-distribution port, and vertex exists
In same plane and the plane is perpendicular to valve core axis.
2. two dimension pulsewidth modulation mechanism as described in claim 1, it is characterised in that: the outer Surface of Sphere of the bearing holder (housing, cover) and transmission shaft
U-shaped shift fork is clearance fit, and single edge contact when stress is able to achieve positive and negative rotation, transmission shaft passes through the wheel assembly that rolls left, right roll wheel assembly
Valve core rotation is driven with roller shaft, spool slides axially under action of hydraulic force, drives bearing holder (housing, cover) axis on transmission shaft U-shaped shift fork
To rolling.
3. two dimension pulsewidth modulation mechanism as described in claim 1, it is characterised in that: the preceding concentric ring and rear concentric ring outer circle
It is respectively fixedly connected in the preceding stepped hole and rear stepped hole of valve pocket both ends of the surface, preceding concentric ring inner hole sleeve is in spool left end shaft, between being
Gap sealing, rear concentric ring inner hole sleeve are clearance seal on spool right end axis.
4. two dimension pulsewidth modulation mechanism as described in claim 1, it is characterised in that: the spool can be rotatably set in valve pocket
Interior, valve pocket bore seal is formed and controls cavity by preceding concentric ring and spool first shoulder, and control cavity is by control oilhole and controls
Liquefaction groove is logical, the logical control pressure oil of control oil groove；Valve pocket bore seal is formed high pressure with the second shoulder by spool first shoulder
Cavity, high-pressure chamber are logical by oil outlet and fuel-displaced groove, while being linked up by diamond shape oil-distribution port and oil-feed tank, and oil-feed tank is logical
Hydraulic pump high pressure oil, out oil groove way system oil circuit；Valve pocket bore seal is formed low pressure by the second shoulder of spool and third shoulder to be held
Chamber, low pressure cavity are linked up by oil return hole and oil-recovery tank, and oil-recovery tank leads to low-pressure reservoir；Spool third shoulder and rear concentric ring are by valve
Bore seal formation feedback cavity is covered, feedback cavity passes through the first circular through hole of spool, center flow channels, the second circular through hole and height
Pressure-volume chamber is linked up, and two cavity pressures are identical；Valve pocket control oil groove, oil groove, oil-feed tank and oil-recovery tank are not linked up mutually outside valve pocket out；
The staggered triangle oil-distribution port of two column is provided on the second shoulder of spool, respectively left triangle oil-distribution port, right triangle is matched
Flow window, valve pocket diamond shape oil-distribution port is located on the motion profile of the second shoulder of spool, spool in valve pocket uniform rotation it is same
When slide axially under action of hydraulic force, make spool left triangle oil-distribution port, right triangle oil-distribution port respectively with valve pocket water chestnut
Shape oil-distribution port flow time accounting changes, so that changing oil stream amount out realizes flow flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821732333.3U CN209164221U (en) | 2018-10-25 | 2018-10-25 | Two-dimentional pulsewidth modulation mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821732333.3U CN209164221U (en) | 2018-10-25 | 2018-10-25 | Two-dimentional pulsewidth modulation mechanism |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553081A (en) * | 2019-09-29 | 2019-12-10 | 上海羿弓精密科技有限公司 | Hydraulic reversing valve and hydraulic reversing device |
| CN111102259A (en) * | 2018-10-25 | 2020-05-05 | 浙江工业大学 | Two-dimensional pulse width modulation mechanism |
| CN113266624A (en) * | 2021-05-17 | 2021-08-17 | 南京航空航天大学 | Rotary valve for high-frequency pulse air pressure modulation |
-
2018
- 2018-10-25 CN CN201821732333.3U patent/CN209164221U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102259A (en) * | 2018-10-25 | 2020-05-05 | 浙江工业大学 | Two-dimensional pulse width modulation mechanism |
| CN111102259B (en) * | 2018-10-25 | 2024-06-07 | 浙江工业大学 | Two-dimensional pulse width modulation mechanism |
| CN110553081A (en) * | 2019-09-29 | 2019-12-10 | 上海羿弓精密科技有限公司 | Hydraulic reversing valve and hydraulic reversing device |
| CN113266624A (en) * | 2021-05-17 | 2021-08-17 | 南京航空航天大学 | Rotary valve for high-frequency pulse air pressure modulation |
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