CN109058038A - A kind of two-way displacement hydraulic motor with speed limiting function - Google Patents
A kind of two-way displacement hydraulic motor with speed limiting function Download PDFInfo
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- CN109058038A CN109058038A CN201810994949.6A CN201810994949A CN109058038A CN 109058038 A CN109058038 A CN 109058038A CN 201810994949 A CN201810994949 A CN 201810994949A CN 109058038 A CN109058038 A CN 109058038A
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- oil circuit
- valve
- motor
- oil
- lever
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0678—Control
- F03C1/0684—Control using a by-pass valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0678—Control
- F03C1/0697—Control responsive to the speed
Abstract
A kind of two-way displacement hydraulic motor with speed limiting function, speed limiting mechanism includes by-passing valve, lever mechanism and speed limit trigger mechanism, one end of the 5th and the 6th oil circuit on by-passing valve passes through hydraulic fluid port A and P respectively and is connected to valve chamber, and the other end of the 5th and the 6th oil circuit is connected to two actuator ports of motor respectively；Spring is provided between spool one end and one end of valve chamber, the other end is connected with slide bar, and sliding bar is equipped with idler wheel one after passing through valve body；Lever mechanism includes the lever being hinged in supporting block and the mandril that is fixed on lever；Lever is abutted against with idler wheel one；The lower end of mandril is equipped with idler wheel two；Speed limit trigger mechanism includes three trigger units, and trigger unit includes the special-shaped slot and spring cavity being provided on cylinder body, sectorial block and reset spring is respectively fitted in special-shaped slot and spring cavity, the both ends of reset spring are affixed with the bottom of sectorial block and spring cavity respectively.The motor can carry out speed limit when being more than or reaching Maximum speed limit, can improve the service life of motor.
Description
Technical field
The present invention relates to hydraulic motor, specifically a kind of two-way displacement hydraulic motor with speed limiting function belongs to hydraulic
Technical field.
Background technique
Common hydraulic motor can be divided into gear type, vane type and plunger type according to structure type.Plunger type motor is pressed
According to the positional relationship of plunger and transmission shaft, and radial and axial two kinds can be divided into.In practical applications, with axial piston motor
It is in the majority.Generally there are two groundwork hydraulic fluid ports for hydraulic motor, when a hydraulic fluid port enters high pressure oil, another hydraulic fluid port oil extraction, horse
The output shaft reached rotates in one direction.Change the hydraulic fluid port of oil inlet and oil extraction, motor rotates to another way.If a liquid
Pressure motor can not change oil inlet and it is fuel-displaced in the case where change the direction of rotation of output shaft, referred to as two-way displacement control is hydraulic
Motor or reversed displacement hydraulic motor.
Fig. 1 to Fig. 3 is a kind of structural principle of axial piston motor in the prior art.Cylinder body 101 is axially arranged
There are several plunger holes, the plunger 102 of equivalent amount is equipped in plunger hole, one end of plunger 102 acts on swash plate 103, cylinder
The left side of body 101 is closely fitted with valve plate 104, is opened on valve plate 104 there are two kidney slot, when a kidney slot enters high pressure
Oil, when another kidney slot is fuel-displaced, pressure oil enters the plunger hole of cylinder body through valve plate, and plunger is overhanging tight under pressure oil effect
Swash plate is pasted, swash plate generates a normal reaction perpendicular to swash plate to plunger, which can be decomposed into axial thrust load and vertical point
Power, wherein axial force balances each other with hydraulic coupling on plunger, and vertical stress component pushes plunger 102 to be allowed to generate anticlockwise torque
(in terms of shaft end), the torque rotate cylinder body 101 counterclockwise along direction shown in Fig. 1.Cylinder body 101 drives output by key 106
Axis 105 rotates, and thus oil liquid pressure can be transformed into the mechanical energy of the rotation of axis 105.
As shown in Figures 2 and 3, swash plate 103 can change the inclination angle of itself and vertical direction under the action of control mechanism, in turn
The displacement size of hydraulic motor is changed, angle is bigger, and discharge capacity is bigger, and vice versa.Define swash plate angle shown in Fig. 1
ɑ is positive value when being greater than 0, while the direction of rotation of motor is positive, then angle after swashplate angle crosses vertical line is negative, and is keeping
Left oilhole 107 enters high pressure oil in the case that right oilhole 108 is fuel-displaced, and the output shaft 105 of motor will rotate clockwise, by changing
The angle for becoming swash plate 103, can change its direction of rotation in the case where not changing hydraulic motor oil liquid flow direction.
According to the calculation formula n=Q/V of hydraulic motor rotary speed, (Q is the flow of hydraulic motor, and V is the row of hydraulic motor
Amount), if reducing its discharge capacity in the case where the flow of holding hydraulic motor is constant, the revolving speed of hydraulic motor being made to increase, such as
Fruit thinks the direction of rotation of change hydraulic motor, necessarily undergoes motor displacement from large to small, through zero delivery, then the mistake that discharge capacity increases
Journey, no matter therefore flow it is how small, in motor displacement very little, the speed of motor can be high, this certainly will will cause motor rotation
The centrifugal force of component increases rapidly, and increases rapidly, grinds so as to cause the secondary speed of related movement of several frictions such as plunger and cylinder body
Damage aggravation, the physics limit beyond motor components cause the damage of motor.
In the prior art, mostly it is the flow for completely cutting through motor by modes such as commutation Vavle switchings, is allowed to stop rotating,
Its discharge capacity is adjusted in the case where motor is static to reversed, then is connected to oil circuit and is allowed to reversely rotate, and is easy to cause to motor in this way
Impact, in addition, its control program is complex；And if reversely become in the case where no cutting motor flow to motor
Amount operation, is also easy to that motor is caused to damage, and even results in equipment and generates safety accident.
Summary of the invention
The present invention provides a kind of two-way displacement hydraulic motor with speed limiting function, which can be when being more than Maximum speed limit
Rate limitation is carried out, and reversed variable operation can be carried out to motor in the case where not cutting off motor flow, helps to simplify behaviour
Make and control program, the service life of motor can be improved, can also improve the security performance of equipment.
To achieve the goals above, the present invention provides a kind of two-way displacement hydraulic motor with speed limiting function, including outer
Shell, motor body and speed limiting mechanism in shell；Motor body includes cylinder body, valve plate, output shaft and swash plate, and cylinder body exists
Multiple plunger holes are uniformly provided in circumferential direction, valve plate is securely fitted in the left end of cylinder body, and output shaft fixing assembling is in cylinder body
In the axocoel of the heart, the right side of cylinder body is arranged in swash plate, and is actively set in the outside of output shaft, relatively opens on valve plate
Equipped with the left oilhole and right oilhole being connected to plunger hole, the plunger being matched therewith, the outer end of plunger are equipped in plunger hole
It acts on swash plate, there is the third oil circuit and the 4th oil circuit connecting respectively with two actuator port on motor body；
The speed limiting mechanism includes by-passing valve, lever mechanism and speed limit trigger mechanism, and the by-passing valve includes fixing assembling
The spool of valve body on the shell, the valve chamber and slidable fit being longitudinally provided in valve body in valve chamber offers on valve body
5th oil circuit and the 6th oil circuit, one end of the 5th oil circuit and one end of the 6th oil circuit pass through hydraulic fluid port A and hydraulic fluid port P respectively and valve chamber connects
It is logical, the other end of the other end of the 5th oil circuit and the 6th oil circuit respectively with third oil circuit and the 4th oil communication；Spool is along valve
The oil circuit between hydraulic fluid port A and hydraulic fluid port P is connected to or disconnected in the sliding process of cavity length direction；Between spool one end and one end of valve chamber
It is provided with spring, the other end is connected with slide bar, and the sliding bar extend into interior of shell after passing through valve body and is equipped with idler wheel
One；
The lever mechanism includes fixed setting supporting block inside the housing, hinged lever and is connected to supporting block
Mandril below lever left part；The supporting block is located at the right side of by-passing valve；Portion of the lever between supporting block and mandril
Divide and abuts against cooperation with idler wheel one；The lower end of the mandril is equipped with idler wheel two；
The speed limit trigger mechanism is arranged in correspondence in the lower section of idler wheel two comprising three be circumferentially uniformly arranged around cylinder body
A trigger unit, each trigger unit is between two adjacent plunger holes；Trigger unit includes being provided with outer surface of cylinder block
On special-shaped slot and the spring cavity that is radially provided on the inside of special-shaped slot, be respectively fitted with sectorial block in special-shaped slot and spring cavity
And reset spring, the both ends of reset spring are fixedly connected with the bottom of sectorial block and spring cavity respectively；It is fan-shaped in initial position
The outer rim of block and the outer rim of cylinder body coincide.
Further, the lower part of the valve chamber isolates control oil pocket by the lower end of spool, and control oil pocket is by being arranged in valve
The 7th oil circuit and the 8th oil circuit on body are connected to the inside of shell, in order to reset the spool of by-passing valve will not rapidly, with
The big ups and downs of motor speed are avoided, fuel-economizing damping is provided in the 8th oil circuit, is provided with connection interior of shell in the 7th oil circuit
Repairing check valve to inside control oil pocket.
Further, the shell is equipped with perforative threaded hole in the right side opening of supporting block, and threaded hole is equipped with adjusting screw rod,
The inner end of adjusting screw rod and the right end top of lever limit and cooperate.By the screw-in depth of adjusting screw rod, adjustable idler wheel one
With the spacing of sectorial block.
Further, the special-shaped slot is made of the guide groove of sectorial block accommodating chamber and the fan-shaped accommodating chamber of connection and spring cavity,
The guide rod radially extended is connected on the inside of the sectorial block, guide rod is only capable of axially slidably being threaded through in guide groove, fan
Shape block is connect by the inner end of guide rod with reset spring.The cooperation of guide groove and guide rod can be in sectorial block centrifugal movement
When, the correct direction of motion of sectorial block is guided, prevents it from rotating.
Further, the size for controlling motor displacement for convenience, further includes variable control mechanism, also connects on motor body
It is connected to draining oil circuit, the connection of draining oil circuit and shell；The variable control mechanism is connected with the first oil circuit and the second oil circuit, the
Two oil circuits and draining oil circuit connection；Third oil circuit passes through check valve two by check valve one and the first oil communication, the 4th oil circuit
With the first oil communication.Variable control mechanism utilizes the row of the high-voltage oil liquid control motor obtained from third oil circuit or the 4th oil circuit
Measure size.
As a preference, the quantity of the plunger hole is nine.
The present invention, can be when motor speed reaches critical value, by sectorial block to external by the setting of speed limiting mechanism
It stretches out to act on lever, makes spool to mobile and compressed spring inside valve chamber, so that the commutation of by-passing valve is realized, so that hydraulic fluid port A
It is connected to hydraulic fluid port P, flows through oil liquid by the access between the 5th oil circuit and the 6th oil circuit, and be no longer flow through hydraulic motor, kept away
Motor is exempted from and hypervelocity phenomenon has occurred, damage caused by can effectively prevent motor due to hypervelocity effectively improves motor and moving
Safety when direction switches.The device can also prevent its revolving speed excessively high on hydraulic pump, or for nonreversing motor.?
During spool is moved to compressed spring direction, the volume for controlling oil pocket can become larger, the oil liquid in shell through the 7th oil circuit and
Repairing check valve enters in control oil pocket.In the present invention, when motor rotary speed is less than its critical speed, sectorial block is in reset spring
Under the action of be retracted in cylinder body during, the spool of by-passing valve gradually resets under the action of the spring, while controlling oil pocket
Interior oil liquid discharge, repairing check valve prevent oil liquid to be discharged through the 7th oil circuit, and being provided with throttle on the 8th oil circuit can
Slow down the speed of oil liquid discharge, so the spool of by-passing valve will not reset rapidly, the 5th oil circuit and the 6th oil circuit also would not be fast
Speed is closed, so as to effectively avoid the big ups and downs of motor speed.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of piston motor in the prior art；
Fig. 2 is the structural schematic diagram of valve plate in Fig. 1；
Fig. 3 is the change in location schematic diagram of the swash plate of piston motor in the prior art；
Fig. 4 is hydraulic schematic diagram of the invention；
Fig. 5 is the structural schematic diagram that motor body is matched with by-passing valve in the present invention；
Fig. 6 is the longitudinal sectional view of motor cylinder in the present invention；
Fig. 7 is the longitudinal sectional view of motor cylinder part in the present invention；
Fig. 8 is the structural schematic diagram for being equipped with speed limiting mechanism in the present invention in motor cylinder；
Fig. 9 is the status diagram of hydraulic motor by-passing valve when exceeding the speed limit in the present invention.
In figure: 1, motor body, 101, cylinder body, 102, plunger, 103, swash plate, 104, valve plate, 105, output shaft, 106,
Key, 107, left oilhole, 108, right oilhole, 109, fabrication hole, 110, spring cavity, 111, pin hole, 112, guide groove, 113, abnormity
Slot, 114, sectorial block accommodating chamber, 115, plunger hole, 2, shell, 3, by-passing valve, 31, spool, 32, idler wheel one, 33, valve body, 34,
Spring, 35, valve chamber, 36, hydraulic fluid port A, 37, hydraulic fluid port P, 38, slide bar, 4, lever mechanism, 41, lever, 42, mandril, 43, idler wheel two,
44, supporting block, 5, third oil circuit, the 6, the 4th oil circuit, 7, draining oil circuit, the 8, the 5th oil circuit, the 9, the 6th oil circuit, 10, Variable Control
Mechanism, the 11, first oil circuit, the 12, second oil circuit, 13, check valve one, 14, check valve two, 15, adjusting screw rod, the 16, the 7th oil circuit,
17, the 8th oil circuit, 18, control oil pocket, 19, speed limit trigger mechanism, 1901, sectorial block, 1902, reset spring, 1903, pin,
1904, guide rod, 201, repairing check valve, 202, throttle, 21, threaded hole.
Specific embodiment
The invention will be further described below.
As shown in Figure 4 and Figure 5, a kind of two-way displacement hydraulic motor with speed limiting function, including shell 2, be located at shell 2
Interior motor body 1 and speed limiting mechanism；Motor body 1 includes cylinder body 101, valve plate 104, output shaft 105 and swash plate 103, cylinder
Body 101 is uniformly provided with multiple plunger holes 115 in the circumferential, and valve plate 104 is securely fitted in the left end of cylinder body 101, output shaft
105 pass through 106 fixing assembling of key in the axocoel at 101 center of cylinder body, and the right side of cylinder body 101 is arranged in swash plate 103, and actively
It is set in the outside of output shaft 105, the left oilhole 107 being connected to plunger hole 115 and the right side are relatively offered on valve plate 104
Oilhole 108 is equipped with the plunger 102 being matched therewith in plunger hole 115, and the outer end of plunger 102 acts on swash plate 103,
There is the third oil circuit 5 and the 4th oil circuit 6 connecting respectively with two actuator port on motor body 1；
The speed limiting mechanism includes by-passing valve 3, lever mechanism 4 and speed limit trigger mechanism 19, and the by-passing valve 3 includes fixing
The spool of the valve body 33 that is assemblied on shell 2, the valve chamber 35 and slidable fit being longitudinally provided in valve body 33 in valve chamber 35
31, the 5th oil circuit 8 and the 6th oil circuit 9 are offered on valve body 33, and one end of the 5th oil circuit 8 and one end of the 6th oil circuit 9 lead to respectively
Cross hydraulic fluid port A36 and hydraulic fluid port P37 be connected to valve chamber 35, the other end of the other end of the 5th oil circuit 8 and the 6th oil circuit 9 respectively with third
Oil circuit 5 is connected to the 4th oil circuit 6；Cooperation is slidingly sealed between spool 31 and valve chamber 35, the middle part of spool 31 forms the recessed of annular
Slot, spool 31 annular groove along 35 length direction sliding process of valve chamber can be connected to or disconnect hydraulic fluid port A36 and hydraulic fluid port P37 it
Between oil circuit；Spring 34 is provided between 31 one end of spool and one end of valve chamber 35, the other end is connected with slide bar 38, the slide bar
38 slide through and extend into 2 inside of shell after valve body 33 and be equipped with idler wheel 1；
The lever mechanism 4 includes supporting block 44 and the hinged lever 41 of supporting block 44 being fixed inside shell 2
With the mandril 42 being connected to below 41 left part of lever；The supporting block 44 is located at the right side of by-passing valve 3；The lever 41 is supporting
Part between block 44 and mandril 42 abuts against cooperation with idler wheel 1；The lower end of the mandril 42 is equipped with idler wheel 2 43；It is other
Port valve 3 is that 2/2-way reversal valve is connected between hydraulic fluid port A36 and hydraulic fluid port P37 when spool 31 is in left position；At spool 31
When right position, it is not turned between hydraulic fluid port A36 and hydraulic fluid port P37；Particular by the lever 41 and slide bar 38 in lever mechanism 4
Idler wheel 1 matches to be able to achieve the commutation of by-passing valve 3, when lever 41 acts on idler wheel 1, can compress spool 31 to pressure
When 34 direction of contracting spring moves, the 5th oil circuit 8 and the conducting of the 6th oil circuit 9, when lever 41 loses when lever 41 no longer acts on idler wheel
When 1, when spool 31 is moved to the direction close to 101 axocoel of cylinder body, the 5th oil circuit 8 and the 6th oil circuit 9 are closed.
The speed limit trigger mechanism 19 is arranged in correspondence in the lower section of idler wheel 2 43 comprising circumferential uniformly around cylinder body 101
Three trigger units being arranged, each trigger unit is between two adjacent plunger holes 115；As shown in Figure 6 to 8, it touches
Bill member includes the special-shaped slot 113 being provided on 101 outer surface of cylinder body and the spring cavity for being radially provided with 113 inside of special-shaped slot
110, be respectively fitted with sectorial block 1901 and reset spring 1902 in special-shaped slot 113 and spring cavity 110, sectorial block 1901 with
Cylinder body 101 rotates together, and the both ends of reset spring 1902 are fixedly connected with the bottom of sectorial block 1901 and spring cavity 1902 respectively,
Reset spring 1902 will have certain pretension.The value of the pretension and the highest critical speed of motor, the quality of sectorial block 1901,
101 radius of cylinder body of motor is related.In order to when reducing motor rotation because stirring oily resistance caused by sectorial block 1902, in initial bit
The outer rim of sectorial block 1902 and the outer rim of cylinder body 101 coincide when setting.In order to facilitate assembly reset spring 1902, in spring cavity
110 inboard is also radially provided with fabrication hole 109, and fabrication hole 109 is connected to the axocoel and spring cavity 110 of cylinder body 101, in cylinder body
101 right end is also provided with the pin hole 111 for being communicated to the inner end of spring cavity 110, and fixing assembling has pin in pin hole 111
1903, the one end of reset spring 1902 far from special-shaped slot 113 is fixedly connected on the bottom of spring cavity 110 by pin 1903.
When hydraulic motor speed reaches certain value, the sectorial block 1901 in cylinder body 101 is set in the effect of centrifugal force
Under stretch out outward, top is contacted with idler wheel 2 43, to push lever 41 around hinge joint rotation, the middle part of lever 41 leads to
Crossing idler wheel 1 pushes spool 31 mobile to the direction far from output shaft 105 and compressed spring 34, and then is connected to hydraulic fluid port A36 and oil
Mouth P37, communicates the 5th oil circuit 8 and the 6th oil circuit 9.Since the flow resistance on by-passing valve 3 is less than the resistance of motor body, because
This high pressure oil be directly over the 5th oil circuit 8 (perhaps the 6th oil circuit 9) into valve chamber 35 again by the 6th oil circuit 9 (or the 5th oil
Road) oil return, therefore reduce the high pressure oil flow into hydraulic motor, it also avoids motor and hypervelocity phenomenon occurs；Work as motor
After crossing zero delivery region, the spool 31 of by-passing valve 3 gradually resets under the action of spring 34, has progressively closed off the 5th oil circuit 8
With the access of the 6th oil circuit 9, oil liquid is also gradually flowed via motor body, and drive motor continues to rotate.By-passing valve 3 is entire
Opening and closing during, be all consecutive variations and movement, avoid and cause biggish impact；No matter motor is from positive discharge capacity
Negative discharge capacity is switched to, or switches to positive discharge capacity from negative discharge capacity, without cutting off motor working connection.When motor speed be reduced to it is small
When its critical value, sectorial block 1901 retracts under the action of reset spring 1902.But because the control oil pocket 18 of by-passing valve 3 is logical
It crosses the 8th oil circuit 17 to be connected to the inside of shell 2, and is provided with throttle 202 in the 8th oil circuit 17, thus, by-passing valve 3
Spool 31 will not reset rapidly, avoid the big ups and downs of motor speed.
As shown in figure 9, the lower part of the valve chamber 35 isolates control oil pocket 31 by the lower end of spool 31, control oil pocket 31 is logical
It crosses the 7th oil circuit 16 being arranged on valve body 33 and the 8th oil circuit 17 is connected to the inside of shell 2, in order to make the valve of by-passing valve
Core will not reset rapidly, and to avoid the big ups and downs of motor speed, fuel-economizing damping 202, the 7th oil are provided in the 8th oil circuit 17
It is provided in road 16 inside connection shell 2 to the repairing check valve 201 inside control oil pocket 31.
As shown in figs. 5 and 9, the shell 2 is equipped with perforative threaded hole 21, threaded hole 21 in the right side opening of supporting block 44
It is equipped with adjusting screw rod 15, the inner end of adjusting screw rod 15 and the right end top of lever 41 limit and cooperates.Pass through adjusting screw rod 15
Screw-in depth, the spacing of adjustable idler wheel 1 and sectorial block 1901.
As shown in Figure 7 and Figure 8, the special-shaped slot 113 by sectorial block accommodating chamber 114 and connects fan-shaped accommodating chamber 114 and bullet
The guide groove 112 of spring chamber 110 forms, and the inside of the sectorial block 1901 is connected with the guide rod 1904 radially extended, guide rod
1904 are only capable of axially slidably being threaded through in guide groove 112, inner end and reset spring of the sectorial block 1901 by guide rod 1904
1902 connections.It is only capable of axially moving between guide groove 112 and guide rod 1904, radial motion cannot be done, in this way, guide groove
112 can guide the correct direction of motion of sectorial block 1901 in 1901 centrifugal movement of sectorial block with the cooperation of guide rod 1904,
Cannot effectively reset after preventing it from rotating.
As shown in figure 4, further including variable control mechanism 10, draining oil circuit 7, draining oil are also connected on motor body 1
The connection on road 7 and shell 2；The variable control mechanism 10 is connected with the first oil circuit 11 and the second oil circuit 12, the second oil circuit 12 with
Draining oil circuit 7 connects；In order to which stroking mechanism obtains control oil sources, and also to avoid motor inner fluid reflux, third oil circuit 5
It is connected to by check valve 1 with the first oil circuit 11, the 4th oil circuit 6 is connected to by check valve 2 14 with the first oil circuit 11.
The quantity of the plunger hole 115 is nine.
Specific works engineering is as follows:
In conjunction with Fig. 3 and Fig. 4, when the swash plate 103 of motor is in positive inclination angle, and third oil circuit 5 enter high pressure oil and the
When four 6 oil extractions of oil circuit, 105 direction of rotation of output shaft of motor is forward direction；When keeping swash plate 103 to be in positive inclination angle, by the
Four oil circuits 6 enter high pressure oil when third 5 oil extraction of oil circuit, and 105 direction of rotation of output shaft of motor is reversed；When the swash plate of motor
103 are in reversed inclination angle, and third oil circuit 5 enter high pressure oil and when the 4th 6 oil extraction of oil circuit, 105 side of rotation of output shaft of motor
To being reversed；When keeping swash plate 103 be in reversed inclination angle, the 4th oil circuit 6 entrance high pressure oil and when third 5 oil extraction of oil circuit, horse
105 direction of rotation of output shaft reached is forward direction；When hydraulic motor needs variable, swash plate is adjusted by variable control mechanism 10
103 angle is realized, regardless of 103 inclination angle of swash plate is positive or reversed.When discharge capacity it is larger i.e. 103 absolute value of inclination of swash plate compared with
When big, because can check to the flow of motor in the design phase, therefore there is no the risks of hypervelocity for motor.
The centrifugal force of sectorial block 1901 is determined by following formula:
In formula, F is centrifugal force, and m is the quality of sectorial block, and v is the linear velocity of sectorial block movement, and R is that sectorial block is revolved around axis
The radius turned, n is the rotation speed of sectorial block, equal with motor rotary speed.
In the case where motor rotary speed is no more than critical value, the centrifugal force of sectorial block 1901 is less than the pre- of reset spring 1902
Pulling force, thus sectorial block 1901 reset spring 1902 effect under, in the profiled holes 113 in cylinder body 101.
In some cases, motor speed can be more than critical value, such as in the case where the flow of motor is constant by motor
Discharge capacity when adjusting to zero delivery, or by the way that the swash plate of motor is adjusted to reversed from forward direction during motor running
(or being reversely adjusted to positive) is come when realizing motor commutation.
In this case, the centrifugal force of sectorial block 1901 has been more than the pulling force of reset spring 1902, therefore sectorial block 1901 exists
It is stretched out under the guiding role of centrifugal force and guide groove 112.As shown in connection with fig. 9,1901 top contact roller 2 43 of sectorial block, thus
Lever 41 is pushed to rotate around hinge joint.For sectorial block 1901 pushes the movement of spool 31, this lever mechanism 4 is a province
Power lever.The middle part of lever 41 pushes spool 31 to move up compressed spring 34 by idler wheel 1, makes the 5th oil circuit 8 and the 6th
Oil circuit 9 is gradually connected to.Since the resistance on by-passing valve 3 is less than the resistance that motor body 1 rotates, high pressure oil is directly over the
The valve chamber 35 that five oil circuits 8 (perhaps the 6th oil circuit 9) enter by-passing valve 3 is discharged by the 6th oil circuit 9 (or the 5th oil circuit 8) again, because
This avoids high pressure oil and enters motor, also avoids motor and hypervelocity phenomenon occurs.During spool 31 moves upwards, control
The volume of liquefaction chamber 18 becomes larger, therefore the oil liquid in shell 2 enters control oil pocket 18 through the 7th oil circuit 16 and repairing check valve 201
It is interior.Also a small amount of oil liquid enters through throttle 202, but because of the hole very little of throttle 202, flow very little.
When motor rotary speed is less than its critical speed, sectorial block 1901 is retracted to cylinder body under the action of reset spring 1902
In 101.The spool 31 of by-passing valve 3 gradually resets under the action of spring 34, while controlling the oil liquid discharge of oil pocket 18.At this point,
Repairing check valve 201 prevents oil liquid to be discharged through the 7th oil circuit 16.Again because being provided with throttle 202 on the 8th oil circuit 17,
So the spool 31 of by-passing valve will not reset rapidly, the 5th oil circuit 8 and the 6th oil circuit 9 would not also be closed rapidly, avoid horse
Up to the big ups and downs of speed.By-passing valve 3 has progressively closed off the access of the 5th oil circuit 8 and the 6th oil circuit 9, oil liquid also gradually via
Motor body flowing, drive motor restore rotation.
By-passing valve 3 during entire opening and closing, be all consecutive variations and movement, avoid cause it is biggish
Impact；No matter motor from positive discharge capacity switches to negative discharge capacity, or switches to positive discharge capacity from negative discharge capacity, without cutting off motor stream
Amount.
The used oil liquid of variable control mechanism 10 is discharged through the second oil circuit 12.It is collected in the leakage oil circuit 7 of motor itself
Together, fuel tank is finally expelled to by the hydraulic fluid port on motor case 2.
Device of the present invention can also be on hydraulic pump, or on conventional unidirectional displacement control motor, for preventing
Only motor exceeds the speed limit.
Claims (6)
1. a kind of two-way displacement hydraulic motor with speed limiting function, including shell (2) and the motor body being located in shell (2)
(1), motor body (1) includes cylinder body (101), valve plate (104), output shaft (105) and swash plate (103), and cylinder body (101) is in week
It is uniformly provided with upwards multiple plunger holes (115), valve plate (104) is securely fitted in the left end of cylinder body (101), output shaft
(105) fixing assembling is in the axocoel at cylinder body (101) center, and swash plate (103) is arranged on the right side of cylinder body (101), and actively
It is set in the outside of output shaft (105), the left oilhole being connected to plunger hole (115) is relatively offered on valve plate (104)
(107) and right oilhole (108) plunger (102) being matched therewith, the outer end of plunger (102), are equipped in plunger hole (115)
Act on swash plate (103), have on motor body (1) the third oil circuit (5) that is connect respectively with two actuator port and
4th oil circuit (6), which is characterized in that further include speed limiting mechanism；
The speed limiting mechanism includes by-passing valve (3), lever mechanism (4) and speed limit trigger mechanism (19), and the by-passing valve (3) includes
The valve body (33) that is securely fitted on shell (2), the valve chamber (35) being longitudinally provided in valve body (33) and slidable fit are in valve
Spool (31) in chamber (35) offers the 5th oil circuit (8) and the 6th oil circuit (9), one end of the 5th oil circuit (8) on valve body (33)
Pass through hydraulic fluid port A (36) and hydraulic fluid port P (37) respectively with one end of the 6th oil circuit (9) to be connected to valve chamber (35), the 5th oil circuit (8) it is another
The other end of one end and the 6th oil circuit (9) is connected to third oil circuit (5) and the 4th oil circuit (6) respectively；Spool (31) is along valve chamber
(35) oil circuit between hydraulic fluid port A (36) and hydraulic fluid port P (37) is connected to or disconnected in length direction sliding process；Spool (31) one end with
It is provided between one end of valve chamber (35) spring (34), the other end is connected with slide bar (38), and the slide bar (38) slides through valve
It extend into shell (2) inside after body (33) and is equipped with idler wheel one (32)；
The lever mechanism (4) includes being fixed at the internal supporting block (44) of shell (2) and supporting block (44) hinged thick stick
Bar (41) and the mandril (42) being connected to below lever (41) left part；The supporting block (44) is located at the right side of by-passing valve (3)；Institute
It states part of the lever (41) between supporting block (44) and mandril (42) and abuts against cooperation with idler wheel one (32)；The mandril (42)
Lower end be equipped with idler wheel two (43)；
The speed limit trigger mechanism (19) is arranged in correspondence in the lower section of idler wheel two (43) comprising circumferential around cylinder body (101)
Three trigger units of even setting, each trigger unit is between two adjacent plunger holes (115)；Trigger unit includes opening
The special-shaped slot (113) being located on cylinder body (101) outer surface and the spring cavity (110) being radially provided on the inside of special-shaped slot (113),
Sectorial block (1901) and reset spring (1902), reset spring are respectively fitted in special-shaped slot (113) and spring cavity (110)
(1902) both ends are fixedly connected with the bottom of sectorial block (1901) and spring cavity (1902) respectively；The sectorial block in initial position
(1902) outer rim and the outer rim of cylinder body (101) coincide.
2. a kind of two-way displacement hydraulic motor with speed limiting function according to claim 1, which is characterized in that the valve
The lower part of chamber (35) isolates control oil pocket (31) by the lower end of spool (31), and control oil pocket (31) is by being arranged in valve body (33)
On the 7th oil circuit (16) and the 8th oil circuit (17) be connected to the inside of shell (2), be provided in the 8th oil circuit (17) fuel-economizing resistance
Buddhist nun (202) is provided in the 7th oil circuit (16) inside connection shell (2) to repairing check valve that control oil pocket (31) is internal
(201)。
3. a kind of two-way displacement hydraulic motor with speed limiting function according to claim 1 or 2, which is characterized in that institute
The right side opening that shell (2) is stated in supporting block (44) is equipped with perforative threaded hole (21), and threaded hole (21) is equipped with adjusting screw rod
(15), the right end top of the inner end of adjusting screw rod (15) and lever (41), which limits, cooperates.
4. a kind of two-way displacement hydraulic motor with speed limiting function according to claim 3, which is characterized in that described different
Shape slot (113) is by sectorial block accommodating chamber (114) and connects guide groove (112) groups of fan-shaped accommodating chamber (114) and spring cavity (110)
At being connected with the guide rod (1904) radially extended on the inside of the sectorial block (1901), guide rod (1904) is only capable of axial cunning
It is threaded through in guide groove (112) dynamicly, sectorial block (1901) is connect by the inner end of guide rod (1904) with reset spring (34).
5. a kind of two-way displacement hydraulic motor with speed limiting function according to claim 4, which is characterized in that further include
Variable control mechanism (10) is also connected with draining oil circuit (7) on motor body (1), the company of draining oil circuit (7) and shell (2)
It is logical；The variable control mechanism (10) is connected with the first oil circuit (11) and the second oil circuit (12), the second oil circuit (12) and draining oil
Road (7) connection；Third oil circuit (5) is connected to by check valve one (13) with the first oil circuit (11), and the 4th oil circuit (6) passes through check valve
Two (14) are connected to the first oil circuit (11).
6. a kind of two-way displacement hydraulic motor with speed limiting function according to claim 5, which is characterized in that the column
The quantity of consent (115) is nine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994949.6A CN109058038B (en) | 2018-08-29 | 2018-08-29 | A kind of two-way displacement hydraulic motor with speed limiting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994949.6A CN109058038B (en) | 2018-08-29 | 2018-08-29 | A kind of two-way displacement hydraulic motor with speed limiting function |
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| Publication Number | Publication Date |
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| CN109058038A true CN109058038A (en) | 2018-12-21 |
| CN109058038B CN109058038B (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810994949.6A Active CN109058038B (en) | 2018-08-29 | 2018-08-29 | A kind of two-way displacement hydraulic motor with speed limiting function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207051A (en) * | 2020-01-15 | 2020-05-29 | 徐州工业职业技术学院 | Valve plate with adjustable cavity and plunger hydraulic pump |
| CN111520304A (en) * | 2020-04-21 | 2020-08-11 | 徐州工业职业技术学院 | Hydraulic pump/motor with good heat dissipation effect |
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| US3623402A (en) * | 1970-07-06 | 1971-11-30 | Abex Corp | Hydraulic motor drive |
| GB1323876A (en) * | 1969-10-22 | 1973-07-18 | Lucas Industries Ltd | Hydraulic pump |
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| CN204716480U (en) * | 2015-06-18 | 2015-10-21 | 山东泰丰液压股份有限公司 | Oblique tray type axial plunger piston variable pump |
| CN205401011U (en) * | 2016-02-27 | 2016-07-27 | 山东泰丰液压股份有限公司 | Inclined disc type variable piston pump |
| CN107387307A (en) * | 2017-07-26 | 2017-11-24 | 徐州工业职业技术学院 | A kind of two-way displacement hydraulic motor with speed-limiting device |
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| GB1323876A (en) * | 1969-10-22 | 1973-07-18 | Lucas Industries Ltd | Hydraulic pump |
| US3623402A (en) * | 1970-07-06 | 1971-11-30 | Abex Corp | Hydraulic motor drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207051A (en) * | 2020-01-15 | 2020-05-29 | 徐州工业职业技术学院 | Valve plate with adjustable cavity and plunger hydraulic pump |
| CN111520304A (en) * | 2020-04-21 | 2020-08-11 | 徐州工业职业技术学院 | Hydraulic pump/motor with good heat dissipation effect |
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| Publication number | Publication date |
|---|---|
| CN109058038B (en) | 2019-08-06 |
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