CN209195855U - A kind of counterbalance valve and steering system and farm machinery with the counterbalance valve - Google Patents
A kind of counterbalance valve and steering system and farm machinery with the counterbalance valve Download PDFInfo
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- CN209195855U CN209195855U CN201822136514.6U CN201822136514U CN209195855U CN 209195855 U CN209195855 U CN 209195855U CN 201822136514 U CN201822136514 U CN 201822136514U CN 209195855 U CN209195855 U CN 209195855U
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Abstract
The utility model relates to a kind of counterbalance valve and steering system and farm machinery with the counterbalance valve, valve body, spool are included, pressure spring and spring base, it is equipped with valve chamber in valve body, offers oil inlet, oil outlet and pressure modulating opening on valve body, and oil inlet, oil outlet and pressure modulating opening are connected with valve chamber；Spool, pressure spring and spring base are successively movably disposed in valve chamber, and side of the spring base far from pressure spring is arranged close to pressure modulating opening；And the inner sidewall of the lateral wall fitting valve chamber of spring base；Wherein, radial section product of the spring base close to pressure modulating opening side is greater than radial section product of the spool close to oil inlet side, and the loss of the utility model oil liquid pressure is smaller, oil circuit is in low-pressure working condition, oil liquid calorific value is reduced, oil liquid high temperature is avoided, energy loss reduces.
Description
Technical field
The utility model relates to counterbalance valve technical field more particularly to a kind of counterbalance valve and with the steering system of the counterbalance valve
System and farm machinery.
Background technique
Cropper controls vehicle heading using diverter at present.In order to control vehicle turn radius size, using turn
Driving wheel clutch is pushed to clutch oil cylinder, whether control clutch continues to transmit kinetic energy.It is dropped in systems using booster
The steering force of low manipulation steering cylinder.In order to provide booster hydraulic power, increase counterbalance valve in system circuit.
Fig. 1 is existing wheel steering system hydraulic schematic diagram, and hydraulic oil is transported in P mouthfuls of diverter by pump, works as vehicle
When not needing to turn to, oil liquid is flowed out by diverter T mouthful；When vehicle is turned to, corresponding hydraulic fluid port and P mouthfuls of connections,
Another hydraulic fluid port and T mouthfuls of connections, after oil liquid enters steering cylinder, still flow out from T mouthfuls.Steering cylinder is by pushing deflecting roller to carry out phase
The divertical motion answered.
In order to control vehicle turn radius size, using steering cluth oil cylinder pushing driving wheel clutch, clutch is controlled
Whether device continues to transmit kinetic energy.The steering force of steering cylinder is reduced by increasing booster in systems, as needed for diverter
Pressure is lower not to be advantageously mounted at pumping hole high-voltage end.In order to provide hydraulic power for booster, increase counterbalance valve in system circuit.
Due to working as force aid system regardless of whether working, oil liquid can just be returned to after oil liquid will open counterbalance valve in steering system
Fuel tank forms a complete hydraulic circuit, and booster frequency of use is not high in actual use, therefore causes
Oil liquid energy largely wastes.There is no independent cooling system in rectification hydraulic system, oil liquid heat can only pass through hydraulic oil container
It radiates with pipeline.The increase of counterbalance valve increases the pressure loss in system circuit, and the quantity of heat production of oil liquid sharply increases, and makes vehicle
Oil temperature is higher.
Utility model content
Technical problem to be solved in the utility model is in view of the deficiencies of the prior art, to provide a kind of counterbalance valve and have
The steering system and farm machinery of the counterbalance valve, at least one to solve the above technical problems.
On the one hand, the technical solution of the utility model solution above-mentioned technical problem is as follows: a kind of counterbalance valve, including valve body,
Spool, pressure spring and spring base, valve body is interior to be equipped with valve chamber, offers oil inlet, oil outlet and pressure modulating opening, and oil inlet on valve body
Mouth, oil outlet and pressure modulating opening are connected with valve chamber；
Spool, pressure spring and spring base are successively movably disposed in valve chamber, and oil inlet and pressure modulating opening are respectively set
At the both ends of the spool, pressure spring and spring base moving direction, and oil inlet and oil outlet are arranged close to spool；Spring base
Side far from pressure spring is arranged close to pressure modulating opening；And the inner sidewall of the lateral wall fitting valve chamber of spring base；
Wherein, radial section product of the spring base close to pressure modulating opening side is greater than spool close to the radial section of oil inlet side
Product.
The beneficial effects of the utility model are: being successively movably disposed at valve by spool, pressure spring and spring base
Intracavitary, side of the spring base far from pressure spring is arranged close to pressure modulating opening, and when pressure modulating opening does not have pressure oil liquid, spring base is separate
The side of pressure spring does not have pressure, when oil liquid enters valve chamber from oil inlet, pushes spool mobile, since spring base is far from bullet
The side of spring does not have pressure, therefore oil liquid using lesser pressure can push spool at oil inlet, and then oil liquid is from oil inlet
Smaller into pressure loss when flowing back into fuel tank through oil outlet, oil circuit is in low-pressure working condition, reduces oil liquid calorific value, keeps away
Oil-free high temperature, energy loss reduce；And when pressure modulating opening has oil liquid to enter, the oil liquid push the spring seat entered from pressure modulating opening moves
Dynamic, compression pressure spring generates active force to spool in turn, causes the oil liquid pressure at oil inlet to increase, the pressure at oil inlet
It is increased with the raising of the pressure at pressure modulating opening；When spool, pressure spring and spring base are generally in equilibrium state, due to
The long-pending radial section for being greater than spool close to oil inlet side of radial section of the spring base close to pressure modulating opening side is long-pending, at oil inlet
Pressure can be higher than the pressure at pressure modulating opening, i.e. control of the set pressure of this counterbalance valve by pressure modulating opening oil liquid pressure；This is practical new
Type, come the movement of adjusting spool, eliminates piston valve used by conventional overflow valve and throttle orifice, changes valve using difference in areas
Voltage regulating mode, not only make safety valve structure simpler, and eliminate because of blocked primary orifice but what spool can not be opened
Hidden danger.
Based on the above technical solution, the utility model can also do following improvement.
Further, the radially inwardly extending limiting section out of valve chamber, when spring base is moved to predeterminated position, limiting section and bullet
Spring abutment limit cooperation.
Beneficial effect using above-mentioned further scheme is: limiting section is used to limit the maximum set pressure of counterbalance valve, limit
Position portion defines that spring base is moved to the maximum distance apart from pressure modulating opening, and counterbalance valve reaches maximum set pressure at this time.
Further, valve chamber includes being connected and coaxial the first valve chamber and the second valve chamber, and oil inlet and oil outlet are with the
One valve chamber is connected, and pressure modulating opening is connected with the second valve chamber；Diameter of the diameter of first valve chamber less than the second valve chamber；Spool is located at
First valve chamber, spring base are located at the second valve chamber.
Beneficial effect using above-mentioned further scheme is: the diameter of the first valve chamber less than the second valve chamber diameter, then
The junction of one valve chamber and the second valve chamber forms the limit to spring base, when spring base abuts the first valve chamber, the tune of counterbalance valve
Constant-pressure is maximum set pressure.
Further, drain pan is provided in the axial direction on the inner sidewall of the first valve chamber, drain pan is connected to oil outlet and the second valve
Chamber.
Beneficial effect using above-mentioned further scheme is: by the way that drain pan is arranged, so that spring base is close to pressure spring
Side be connected to oil outlet, avoid during compressing pressure spring, space locating for pressure spring generates additional
Pressure influences the balance adjustment of pressure and pressure at oil inlet at pressure modulating opening；And drain pan can solve in cavity locating for spring and be stranded
Oily phenomenon.
Further, pressure modulating opening is equipped with plug screw, and plug screw is equipped with spiro pluging hole, and spiro pluging hole is connected with valve chamber.
Beneficial effect using above-mentioned further scheme is: plug screw limits spring base to the movement in pressure modulating opening direction
Position；And it is easily installed maintenance and renewal part.
Further, sealing ring is equipped between pressure modulating opening and plug screw.
Beneficial effect using above-mentioned further scheme is: sealing ring plays sealing function, stable voltage mouth oil liquid pressure.
Further, oil inlet and pressure modulating opening coaxial arrangement.
Beneficial effect using above-mentioned further scheme is: oil inlet and pressure modulating opening are coaxially disposed, so that spool, pressure regulation bullet
The direction for two external force that spring and spring base are integrally subject to is in same straight line, and stress more balances.
Further, the axis of oil inlet and the axis of valve chamber coincide；Oil outlet is arranged close to oil inlet, and oil outlet
Axis is vertical with the axis of oil inlet.
Beneficial effect using above-mentioned further scheme is: said structure design makes, this back pressure valve arrangement is simple, is convenient for
Maintenance.
On the other hand, the utility model provides a kind of steering system, including a kind of above-mentioned counterbalance valve.
The beneficial effect of this programme is: this programme has whole beneficial effects of above-mentioned counterbalance valve, and details are not described herein again.
Another aspect, the utility model provide a kind of farm machinery, including a kind of above-mentioned steering system.
Detailed description of the invention
Fig. 1 is steering system schematic illustration in the prior art；
Fig. 2 is the utility model counterbalance valve structural schematic diagram；
Fig. 3 is the first valve chamber of the utility model schematic cross-section；
Fig. 4 is the utility model steering system schematic illustration.
In attached drawing, parts list represented by the reference numerals are as follows:
1, valve body, 2, spool, 3, pressure spring, 4, spring base, 5, plug screw, 6, sealing ring, 7, oil inlet, 8, oil outlet,
9, pressure modulating opening, 10, drain pan, 11, spring cavity, 12, pressure regulating cavity, 13, steering cylinder, 14, clutch booster and pedal, 15,
Clutch oil cylinder, 16, counterbalance valve in the prior art, 17, counterbalance valve in the utility model.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
As shown in figs. 1 and 4, hydraulic oil is transported in P mouthfuls of diverter by pump, when vehicle does not need to turn to, oil liquid
It is flowed out by T mouthfuls of diverter；When vehicle is turned to, corresponding hydraulic fluid port is connected with P mouthfuls of connections, another hydraulic fluid port with T mouthfuls, oil
After liquid enters steering cylinder 13, still flowed out from T mouthfuls.Steering cylinder 13 is by pushing deflecting roller to carry out corresponding divertical motion.
In order to control vehicle turn radius size, using steering cluth oil cylinder 15 push driving wheel clutch, control from
Whether clutch continues to transmit kinetic energy.The manipulation of steering cylinder 13 is reduced by increasing clutch booster and pedal 14 in systems
Power, the pressure as needed for diverter is lower not to be advantageously mounted at pumping hole high-voltage end.In order to provide hydraulic power for booster, in system
Increase counterbalance valve in circuit.
It is to increase this reality in system circuit in Fig. 4 to increase counterbalance valve 16 in the prior art in system circuit in Fig. 1
With novel middle counterbalance valve 17.
Embodiment 1
As in Figure 2-4, a kind of counterbalance valve, including valve body 1, spool 2, pressure spring 3 and spring base 4 are equipped in valve body 1
Valve chamber, offers oil inlet 7, oil outlet 8 and pressure modulating opening 9 on valve body 1, and oil inlet 7, oil outlet 8 and pressure modulating opening 9 are and valve chamber
It is connected；
Spool 2, pressure spring 3 and spring base 4 are successively movably disposed in valve chamber, and oil inlet 7 and pressure modulating opening 9 are distinguished
The both ends of 4 moving direction of the spool 2, pressure spring 3 and spring base are set, and oil inlet 7 and oil outlet 8 are close to spool 2
Setting；Side of the spring base 4 far from pressure spring 3 is arranged close to pressure modulating opening 9；And the lateral wall fitting valve chamber of spring base 4 is interior
Side wall；
Wherein, radial section product of the spring base 4 close to 9 side of pressure modulating opening is greater than spool 2 close to the radial direction of 7 side of oil inlet
Sectional area.
The beneficial effect of the present embodiment is: being successively movably disposed at valve by spool 2, pressure spring 3 and spring base 4
Intracavitary, side of the spring base 4 far from pressure spring 3 is arranged close to pressure modulating opening 9, when pressure modulating opening 9 does not have pressure oil liquid, spring base
4 sides far from pressure spring 3 do not have pressure, when oil liquid enters valve chamber from oil inlet 7, push spool 2 mobile, due to spring
4 sides far from spring of seat do not have pressure, therefore oil liquid using lesser pressure can push spool 2 at oil inlet 7, and then oil
Liquid is smaller from oil inlet 7 into pressure loss when flowing back into fuel tank through oil outlet 8, and oil circuit is in low-pressure working condition, reduces
Oil liquid calorific value, avoids oil liquid high temperature, and energy loss reduces；And when pressure modulating opening 9 has oil liquid to enter, enter from pressure modulating opening 9
Oil liquid push the spring seat 4 is mobile, and compression pressure spring 3 generates active force to spool 2 in turn, leads to the oil liquid pressure at oil inlet 7
Strong to increase, the pressure at oil inlet 7 is increased with the raising of the pressure at pressure modulating opening 9；In spool 2, pressure spring 3 and spring
When seat 4 is generally in equilibrium state, the radial section product due to spring base 4 close to 9 side of pressure modulating opening is greater than spool 2 close to oil inlet
The radial section of 7 sides of mouth is long-pending, and the pressure at oil inlet 7 can be higher than the pressure at pressure modulating opening 9, the i.e. set pressure of this counterbalance valve
By the control of 9 oil liquid pressure of pressure modulating opening；The utility model, come the movement of adjusting spool 2, eliminates conventional overflow using difference in areas
Piston valve and throttle orifice used by valve, change the voltage regulating mode of valve, not only make safety valve structure simpler, but also eliminate
Because of blocked primary orifice but the hidden danger that can not open of spool 2.
Embodiment 2
As in Figure 2-4, a kind of counterbalance valve, including valve body 1, spool 2, pressure spring 3 and spring base 4 are equipped in valve body 1
Valve chamber, offers oil inlet 7, oil outlet 8 and pressure modulating opening 9 on valve body 1, and oil inlet 7, oil outlet 8 and pressure modulating opening 9 are and valve chamber
It is connected；
Spool 2, pressure spring 3 and spring base 4 are successively movably disposed in valve chamber, and oil inlet 7 and pressure modulating opening 9 are distinguished
The both ends of 4 moving direction of the spool 2, pressure spring 3 and spring base are set, and oil inlet 7 and oil outlet 8 are close to spool 2
Setting；Side of the spring base 4 far from pressure spring 3 is arranged close to pressure modulating opening 9；And the lateral wall fitting valve chamber of spring base 4 is interior
Side wall；
Wherein, radial section product of the spring base 4 close to 9 side of pressure modulating opening is greater than spool 2 close to the radial direction of 7 side of oil inlet
Sectional area.
Preferably, as shown in Fig. 2, valve chamber includes being connected and coaxial the first valve chamber and the second valve chamber, oil inlet 7 and go out
Hydraulic fluid port 8 is connected with the first valve chamber, and pressure modulating opening 9 is connected with the second valve chamber；The diameter of first valve chamber is less than the second valve chamber
Diameter；Spool 2 is located at the first valve chamber and the lateral wall of spool 2 and the inner sidewall of the first valve chamber are fitted and connected, and spring base 4 is located at the
Two valve chambers.The diameter of first valve chamber is formed less than the diameter of the second valve chamber, the then junction of the first valve chamber and the second valve chamber to bullet
The limit of spring abutment 4, when spring base 4 abuts the first valve chamber, the set pressure of counterbalance valve is maximum set pressure.
Specifically, in the present embodiment, spool 2 be it is cylindric, spool 2 can be made taper in other specific embodiments
Or other any shapes, as long as guaranteeing that 7 oil liquid of oil inlet is less than 9 oil liquid of pressure modulating opening to spring base to the perpendicular acting area of spool
4 perpendicular acting area can.
Preferably, oil inlet 7 and pressure modulating opening 9 are coaxially disposed, and the axis of oil inlet 7 and the axis of valve chamber coincide；It is fuel-displaced
Mouth 8 is arranged close to oil inlet 7, and the axis of oil outlet 8 is vertical with the axis of oil inlet 7.
Oil inlet 7 and pressure modulating opening 9 are coaxially disposed, so that be integrally subject to two of spool 2, pressure spring 3 and spring base 4 are outer
The direction of power is in same straight line, and stress more balances, and said structure design makes, this back pressure valve arrangement is simple, easy to repair.
As shown in Figures 2 and 3, drain pan 10 is provided in the axial direction on the inner sidewall of the first valve chamber, drain pan 10 is connected to fuel-displaced
Mouth 8 and the second valve chamber.
Specifically, 3 drain pans 10 are evenly equipped in the present embodiment along the first valve chamber inner sidewall, by the way that drain pan is arranged
10, so that spring base 4 is connected at the side of pressure spring 3 and oil outlet 8, avoid during compressing pressure spring 3,
Space locating for pressure spring 3 generates additional pressure, influences the balance adjustment of pressure and pressure at oil inlet 7 at pressure modulating opening 9；
And drain pan 10 can solve pocketed oil phenomenon in cavity locating for pressure spring 3.
As shown in Fig. 2, pressure modulating opening 9 is equipped with plug screw 5, it is equipped with sealing ring 6 between pressure modulating opening 9 and plug screw 5, is set on plug screw 5
There is spiro pluging hole, spiro pluging hole is connected with valve chamber.Plug screw 5 limits spring base 4 to the movement in 9 direction of pressure modulating opening；And it is convenient for
Installation and maintenance and renewal part.Sealing ring 6 plays sealing function, 9 oil liquid pressure of stable voltage mouth.
Specifically, as shown in Fig. 2, pressure spring 3 connect and is arranged with spool 2 close to the side of spool 2 in the present embodiment
On spool 2, the drift of pressure spring 3 is less than the locating distance of pressure spring 3, and wherein locating distance refers to spool 2 and pressure regulation
Close to the distance of 3 side of pressure spring on the junction of spring 3 to spring base 4.
That is, original state, pressure spring 3 is in free state, and one end of pressure spring 3 is connect with spool 2, separately
There is certain interval in one end apart from spring base 4, and spring base 4 is spring cavity 11 close to the space of spring side, and 4 other side of spring base is
Pressure regulating cavity 12.
As shown in Fig. 2, the left side of valve chamber is oil inlet 7, right side is pressure modulating opening 9, and oil outlet 8 is vertically arranged with valve chamber, and
Oil outlet 8 is arranged close to spool 2 far from the side of pressure spring 3, when not having oil liquid to enter i.e. in pressure regulating cavity 12 in pressure regulating cavity 12
There is no pressure, the oil liquid at oil inlet 7 enters valve chamber, spool 2 can be pushed to move right using lesser pressure, oil liquid from into
The pressure loss is smaller when hydraulic fluid port 7 to oil outlet 8 flows back to mailbox.There is oil liquid to enter pressure regulating cavity 12 at pressure modulating opening 9, in pressure regulating cavity 12
Pressure push the spring seat 4 be moved to the left, compress pressure spring 3, spring base 4, which is eventually moved to, abuts to the first valve chamber, this
When oil inlet 7 at pressure reach maximum set pressure.
When the pressure reduction of pressure regulating cavity 12 is to during zero, spring base 4 moves right under the action of pressure spring 3,
And with the reduction of 12 pressure of pressure regulating cavity, the pressure of oil inlet 7 is also reducing, and spool 2 also moves to left under the action of the spring.
It should be noted that spool 2 can be in the position of unclosed oil outlet 8, that is to say, that oil inlet in the present embodiment
Mouth 7 can be the state being connected to always with oil outlet 8.
The oil liquid that oil inlet 7 enters can enter spring cavity 11 with drain pan 10, and spring cavity 11 is to connect with oil outlet 8
Logical, 11 pocketed oil phenomenon of spring cavity is effectively solved.
The beneficial effect of the present embodiment is: being successively movably disposed at valve by spool 2, pressure spring 3 and spring base 4
Intracavitary, side of the spring base 4 far from pressure spring 3 is arranged close to pressure modulating opening 9, when pressure modulating opening 9 does not have pressure oil liquid, spring base
4 sides far from pressure spring 3 do not have pressure, when oil liquid enters valve chamber from oil inlet 7, push spool 2 mobile, due to spring
4 sides far from spring of seat do not have pressure, therefore oil liquid using lesser pressure can push spool 2 at oil inlet 7, and then oil
Liquid is smaller from oil inlet 7 into pressure loss when flowing back into fuel tank through oil outlet 8, and oil circuit is in low-pressure working condition, reduces
Oil liquid calorific value, avoids oil liquid high temperature, and energy loss reduces；And when pressure modulating opening 9 has oil liquid to enter, enter from pressure modulating opening 9
Oil liquid push the spring seat 4 is mobile, and compression pressure spring 3 generates active force to spool 2 in turn, leads to the oil liquid pressure at oil inlet 7
Strong to increase, the pressure at oil inlet 7 is increased with the raising of the pressure at pressure modulating opening 9；In spool 2, pressure spring 3 and spring
When seat 4 is generally in equilibrium state, the radial section product due to spring base 4 close to 9 side of pressure modulating opening is greater than spool 2 close to oil inlet
The radial section of 7 sides of mouth is long-pending, and the pressure at oil inlet 7 can be higher than the pressure at pressure modulating opening 9, the i.e. set pressure of this counterbalance valve
By the control of 9 oil liquid pressure of pressure modulating opening；The utility model, come the movement of adjusting spool 2, eliminates conventional overflow using difference in areas
Piston valve and throttle orifice used by valve, change the voltage regulating mode of valve, not only make safety valve structure simpler, but also eliminate
Because of blocked primary orifice but the hidden danger that can not open of spool 2, this counterbalance valve is simple, effectively, securely and reliably, easily promotes and applies.
Embodiment 3
A kind of counterbalance valve, including valve body 1, spool 2, pressure spring 3 and spring base 4, are equipped with valve chamber in valve body 1, on valve body 1
Oil inlet 7, oil outlet 8 and pressure modulating opening 9 are offered, and oil inlet 7, oil outlet 8 and pressure modulating opening 9 are connected with valve chamber；Spool
2, pressure spring 3 and spring base 4 are successively movably disposed in valve chamber, and oil inlet 7 and pressure modulating opening 9 are separately positioned on the valve
The both ends of 4 moving direction of core 2, pressure spring 3 and spring base, and oil inlet 7 and oil outlet 8 are arranged close to spool 2；Spring base 4
Side far from pressure spring 3 is arranged close to pressure modulating opening 9；And the inner sidewall of the lateral wall fitting valve chamber of spring base 4；
Wherein, radial section product of the spring base 4 close to 9 side of pressure modulating opening is greater than spool 2 close to the radial direction of 7 side of oil inlet
Sectional area.
Specifically, valve chamber includes the first valve chamber and the second valve chamber being connected, the diameter of the first valve chamber and the second valve chamber
Diameter is identical, and oil inlet 7 and oil outlet 8 are connected with the first valve chamber, and pressure modulating opening 9 is connected with the second valve chamber；Spool 2 is located at
First valve chamber, spring base 4 are located at the second valve chamber.The space of 2 top of spool is equivalent to the drain pan 10 in embodiment 2, so that bullet
Spring abutment 4 is connected at the side of pressure spring 3 and oil outlet 8, is avoided during compressing pressure spring 3, pressure spring 3
Locating space generates additional pressure, influences the balance adjustment of pressure and pressure at oil inlet 7 at pressure modulating opening 9；And drain pan
10 can solve pocketed oil phenomenon in cavity locating for pressure spring 3.
It further include limiting section in the present embodiment, the second valve chamber extends radially out the limiting section, the lateral wall of spring base 4
On offer a groove, limiting section and groove limit cooperate, and limiting section is used to limit the maximum set pressure of counterbalance valve, limiting section
Define that spring base 4 is moved to the maximum distance apart from pressure modulating opening 9, counterbalance valve reaches maximum set pressure at this time.
Preferably, oil inlet 7 and pressure modulating opening 9 are coaxially disposed, and oil inlet 7 and pressure modulating opening 9 are coaxially disposed, so that spool 2, tune
The direction for two external force that pressing spring 3 and spring base 4 are integrally subject to is in same straight line, and stress more balances.
As shown in Fig. 2, pressure modulating opening 9 is equipped with plug screw 5, it is equipped with sealing ring 6 between pressure modulating opening 9 and plug screw 5, is set on plug screw 5
There is spiro pluging hole, spiro pluging hole is connected with valve chamber.Plug screw 5 limits spring base 4 to the movement in 9 direction of pressure modulating opening；And it is convenient for
Installation and maintenance and renewal part.Sealing ring 6 plays sealing function, 9 oil liquid pressure of stable voltage mouth.
Specifically, as shown in Fig. 2, pressure spring 3 connect and is arranged with spool 2 close to the side of spool 2 in the present embodiment
On spool 2, the drift of pressure spring 3 is less than the locating distance of pressure spring 3, and wherein locating distance refers to spool 2 and pressure regulation
Close to the distance of 3 side of pressure spring on the junction of spring 3 to spring base 4.
That is, original state, pressure spring 3 is in free state, and one end of pressure spring 3 is connect with spool 2, separately
There is certain interval in one end apart from spring base 4, and spring base 4 is spring cavity 11 close to the space of spring side, and 4 other side of spring base is
Pressure regulating cavity 12.
As shown in Fig. 2, the left side of valve chamber is oil inlet 7, right side is pressure modulating opening 9, and oil outlet 8 is vertically arranged with valve chamber, and
Oil outlet 8 is arranged close to spool 2 far from the side of pressure spring 3, when not having oil liquid to enter i.e. in pressure regulating cavity 12 in pressure regulating cavity 12
There is no pressure, the oil liquid at oil inlet 7 enters valve chamber, spool 2 can be pushed to move right using lesser pressure, oil liquid from into
The pressure loss is smaller when hydraulic fluid port 7 to oil outlet 8 flows back to mailbox.There is oil liquid to enter pressure regulating cavity 12 at pressure modulating opening 9, in pressure regulating cavity 12
Pressure push the spring seat 4 be moved to the left, compress pressure spring 3, spring base 4 is eventually moved to the predeterminated position of left end,
Limiting section limited spring seat 4 continues to be moved to the left, and the pressure at oil inlet 7 reaches maximum set pressure at this time.
When the pressure reduction of pressure regulating cavity 12 is to during zero, spring base 4 moves right under the action of pressure spring 3,
And with the reduction of 12 pressure of pressure regulating cavity, the pressure of oil inlet 7 is also reducing, and spool 2 also moves to left under the action of the spring.
It should be noted that spool 2 can be in the position of unclosed oil outlet 8, that is to say, that oil inlet in the present embodiment
Mouth 7 can be the state being connected to always with oil outlet 8.
The oil liquid that oil inlet 7 enters can enter spring cavity 11 with drain pan 10, and spring cavity 11 is to connect with oil outlet 8
Logical, 11 pocketed oil phenomenon of spring cavity is effectively solved.
The present embodiment the utility model has the advantages that the present embodiment have embodiment 2 whole beneficial effects.
Embodiment 4
As shown in figure 4, a kind of steering system, including a kind of above-mentioned counterbalance valve, and oil inlet 7 connects diverter oil outlet
8 pipelines (T mouthfuls of pipelines), oil outlet 8 connect hydraulic oil container, and pressure modulating opening 9 connects booster to resistance cylinder pipe.
When working without power-assisted, booster does not have pressure oil liquid into power-assisted cylinder pipe, therefore in pressure modulating opening 9
There is no pressure oil liquid, therefore there is no pressure in pressure regulating cavity 12.Oil liquid enters valve body 1 in oil inlet 7, and spool 2 is pushed to move to right, due to
Pressure regulating cavity 12 does not have pressure, and 3 drift of pressure spring is less than locating distance, therefore oil liquid with lesser pressure is in oil inlet 7
Openable spool 2 is connected oil inlet 7 and oil outlet 8, therefore is flowed back to from the oil liquid that diverter T mouthfuls (8 pipeline of oil outlet) flows out
The pressure loss is smaller when fuel tank.
When type power steering, booster oil liquid into power-assisted cylinder pipe is compressed, and generates certain pressure, therefore
Oil liquid also generates pressure in pressure regulating cavity 12.12 pressure oil push the spring seat 4 of pressure regulating cavity moves to left, and pressure spring 3 is compressed, due to spring
4 diameters of seat are greater than the diameter of spool 2, so spring base 4 is eventually pulled to left side and contacts with valve body 1, spring is set up at this time
Pressure is system demand pressure.
Spring base 4 is changed to movable in the present embodiment, so that it is regulated and controled pressure and is controlled by the pressure of clutch, therefore can be real
Now when not manipulating booster valve, spring locating distance is in maximum, and spring is made to be in drift or minimum set pressure, therefore valve
Set pressure it is smaller, T mouthfuls of oil circuits of diverter are in low-pressure working condition, reduce oil liquid calorific value, avoid oil liquid high temperature.
One of the utility model counterbalance valve set pressure (oil inlet mouth pressure) is determined by spring base 4, spring 3,
Since spring base 4 is movable, 9 oil liquid push the spring seat 4 of pressure modulating opening movement (decrement of position decision spring 3), pressure modulating opening 9
Connect operation element (the present embodiment export for booster (or cylinder ports)), set up by the pressure at this time of operation element into
7 pressure of hydraulic fluid port.When 9 pressure of pressure modulating opening is 0bar (booster does not work), this counterbalance valve set pressure (oil inlet 7 at this time
Mouth pressure) it is very low, the energy that oil liquid reaches the consumption of oil outlet 8 from oil inlet 7 is less；When booster work, pressure modulating opening is begun with
Pressure, push the spring seat 4 move to left, and spring base 4, which moves to left, causes 7 pressure of oil inlet that can also increase, 7 oil liquid of oil inlet there are also all the way with
Booster import is connected, and causes 9 pressure of pressure modulating opening also to start to increase, i.e., 9 pressure of pressure modulating opening influences each other with 7 pressure of oil inlet.
The beneficial effect of the present embodiment is: the present embodiment has whole beneficial effects of above-mentioned counterbalance valve, herein just no longer
It repeats.
Embodiment 5
A kind of farm machinery, including a kind of above-mentioned steering system.
The beneficial effect of the present embodiment is: the present embodiment have above-mentioned steering system to whole beneficial effects, herein
It repeats no more.
In the description of this specification, reference term " embodiment one ", " embodiment two ", " example ", " specific example " or
The description of " some examples " etc. means that specific method, device or feature described in conjunction with this embodiment or example are contained in this reality
With at least one novel embodiment or example.In the present specification, schematic expression of the above terms are necessarily directed to
Be identical embodiment or example.Moreover, description specific features, method, apparatus or feature can any one or it is more
It can be combined in any suitable manner in a embodiment or example.In addition, without conflicting with each other, those skilled in the art can
The feature of different embodiments or examples described in this specification and different embodiments or examples to be combined.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
1. a kind of counterbalance valve, which is characterized in that including valve body (1), spool (2), pressure spring (3) and spring base (4), the valve
It is equipped with valve chamber in body (1), offers oil inlet (7), oil outlet (8) and pressure modulating opening (9), and the oil inlet on the valve body (1)
Mouth (7), oil outlet (8) and pressure modulating opening (9) are connected with the valve chamber；
The spool (2), pressure spring (3) and spring base (4) are successively movably disposed in the valve chamber, the oil inlet
(7) and pressure modulating opening (9) is separately positioned on the both ends of the spool (2), pressure spring (3) and spring base (4) moving direction, and institute
Oil inlet (7) and oil outlet (8) is stated to be arranged close to the spool；Side of the spring base (4) far from the pressure spring (3)
It is arranged close to the pressure modulating opening (9), and the lateral wall of the spring base (4) is bonded the inner sidewall of the valve chamber；
Wherein, radial section product of the spring base (4) close to the pressure modulating opening (9) side is greater than the spool (2) close to institute
State the radial section product of oil inlet (7) side.
2. a kind of counterbalance valve according to claim 1, which is characterized in that the radially inwardly extending limit out of the valve chamber
Portion, when the spring base is moved to predeterminated position, the limiting section and the spring base (4) limit cooperate.
3. a kind of counterbalance valve according to claim 1, which is characterized in that the valve chamber includes being connected and the first coaxial valve
Chamber and the second valve chamber, the oil inlet (7) and oil outlet (8) are connected with first valve chamber, the pressure modulating opening (9) and institute
The second valve chamber is stated to be connected；The diameter of first valve chamber is less than the diameter of second valve chamber；The spool (2) is located at described
First valve chamber, the spring base (4) are located at second valve chamber.
4. a kind of counterbalance valve according to claim 3, which is characterized in that opened up on the inner sidewall of first valve chamber along axial direction
Have drain pan (10), the drain pan (10) is connected to the oil outlet (8) and second valve chamber.
5. a kind of counterbalance valve according to claim 1, which is characterized in that the pressure modulating opening (9) is equipped with plug screw (5), described
Plug screw (5) is equipped with spiro pluging hole, and the spiro pluging hole is connected with the valve chamber.
6. a kind of counterbalance valve according to claim 5, which is characterized in that set between the pressure modulating opening (9) and the plug screw (5)
There are sealing ring (6).
7. a kind of counterbalance valve according to claim 1, which is characterized in that the oil inlet (7) and the pressure modulating opening (9) are coaxial
Setting.
8. a kind of counterbalance valve according to claim 7, which is characterized in that the axis of the oil inlet (7) and the valve chamber
Axis coincides；The oil outlet (8) is arranged close to the oil inlet (7), and the axis of the oil outlet (8) and the oil inlet
The axis of mouth (7) is vertical.
9. a kind of steering system, which is characterized in that including a kind of described in any item counterbalance valves of such as claim 1-8.
10. a kind of farm machinery, which is characterized in that including a kind of steering system as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136514.6U CN209195855U (en) | 2018-12-19 | 2018-12-19 | A kind of counterbalance valve and steering system and farm machinery with the counterbalance valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136514.6U CN209195855U (en) | 2018-12-19 | 2018-12-19 | A kind of counterbalance valve and steering system and farm machinery with the counterbalance valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209195855U true CN209195855U (en) | 2019-08-02 |
Family
ID=67429759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822136514.6U Expired - Fee Related CN209195855U (en) | 2018-12-19 | 2018-12-19 | A kind of counterbalance valve and steering system and farm machinery with the counterbalance valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209195855U (en) |
-
2018
- 2018-12-19 CN CN201822136514.6U patent/CN209195855U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee after: Weichai leiwo Heavy Industry Co.,Ltd. Address before: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee before: LOVOL HEAVY INDUSTRY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190802 Termination date: 20211219 |
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| CF01 | Termination of patent right due to non-payment of annual fee |