CN205877280U - Novel intercommunication formula voltage limiting multiple unit valve - Google Patents

Abstract

The utility model provides a novel intercommunication formula voltage limiting multiple unit valve belongs to valve technical field, including valve body and main valve core, be provided with oil circuit and first control chamber in the valve body, the oil circuit includes oil feed oil circuit, oil return oil circuit, first work oil circuit and second work oil circuit. Oil feed oil circuit, oil return oil circuit, first work oil circuit and second work oil circuit all with first control chamber intercommunication. Main valve core locates the first control intracavity and is used for control circuit's conversion. First voltage limiting hole and second voltage limiting hole have been seted up on the valve body, downthehole first voltage limiting case, the downthehole second voltage limiting case that is equipped with of second voltage limiting of being equipped with of first voltage limiting. First voltage limiting case can communicate first work oil circuit and oil return oil circuit or cut off, and second voltage limiting case can communicate second work oil circuit and oil return oil circuit or cut off. First voltage limiting case can carry out the voltage limiting to first work oil circuit, and second voltage limiting case can carry out the voltage limiting to second work oil circuit for oil pressure in first work oil circuit and the second work oil circuit can not be too high.

Description

A kind of novel intercommunication pressure limiting banked direction control valves

Technical field

This utility model relates to belonging to valve technology field, in particular to a kind of novel intercommunication pressure limiting banked direction control valves.

Background technology

At present, it is typically provided a banked direction control valves in tractor hydraulic oil circuit part, is realized the liter of trailer by banked direction control valves Drop the advance with rear-guard assembly, retreat or stop.

Existing banked direction control valves, is typically provided fluid by oil pump, and the oil pressure of oil-in input is bigger so that in working oil path Oil pressure is relatively big, and oil pressure in the working oil path within banked direction control valves is excessive easily execution unit is caused damage, will result in huge Economic loss, there is certain potential safety hazard.

Utility model content

The purpose of this utility model is to provide a kind of novel intercommunication pressure limiting banked direction control valves, to improve the work of existing banked direction control valves The problem that oil circuit pressure is big.

This utility model is achieved in that

This utility model provides a kind of novel intercommunication pressure limiting banked direction control valves, for controlling the forward and reverse motion of execution unit, Including valve body and main valve plug, be provided with in valve body oil circuit and first control chamber, oil circuit include oil-feed oil circuit, oil return circuit, first Working oil path and the second working oil path, the first working oil path and the second working oil path connect for internal with execution unit, oil-feed Oil circuit, oil return circuit, the first working oil path all control chamber with first with the second working oil path and connect, and main valve plug is located at the first control Intracavity and the conversion for oil circuit control；

Offer the first pressure limiting hole and the second pressure limiting hole on valve body, in the first pressure limiting hole, be provided with the first pressure limiting spool, second Being provided with the second pressure limiting spool in pressure limiting hole, the first working oil path can be connected with oil return circuit or cut off by the first pressure limiting spool, Second working oil path can be connected with oil return circuit or cut off by the second pressure limiting spool.

Further, the first pressure limiting spool includes fixed body, spring and steel ball, and steel ball is connected by spring with fixed body, Fixed body removably connects with valve body, and the first working oil path connects and formed pressure limiting oil with oil return circuit by the first pressure limiting hole Road, steel ball is used for connecting or cut off pressure limiting oil circuit.

Further, the first pressure limiting hole is divided into the first hole section and the second hole section through oil return circuit and by oil return circuit, First working oil path is connected by the first hole section with oil return circuit, and fixation postures is in the second hole section, and steel ball is positioned at the first hole section Interior and formation is tightly connected.

Further, main valve plug is 3-position 4-way spool, and main valve plug rotates and oil circuit can be made to be in three kinds of duties, point It is not the first duty, the second duty and the 3rd duty, when oil circuit is in the first duty, oil-feed oil circuit, Oil return circuit, the first working oil path connect mutually with the second working oil path；When oil circuit is in the second duty, oil-feed oil circuit Connecting with the first working oil path, the second working oil path connects with oil return circuit；When oil circuit is in three duties, oil-feed oil circuit Connecting with the second working oil path, the first working oil path connects with oil return circuit.

Further, the first inwall controlling chamber includes the first inwall, the second inwall, the 3rd inwall and the 4th inwall, returns Oil oil circuit is arranged between the first inwall and the second inwall, and the second working oil path is located between the second inwall and the 3rd inwall, enters Oil oil circuit is located between the 3rd inwall and the 4th inwall, and the first working oil path is located between the 4th inwall and the first inwall；

First inwall and the second inwall all include non-laminating section and the first laminating section, and the 3rd inwall and the 4th inwall include the Two laminating sections, main valve plug can simultaneously with the first laminating section, the second laminating section gluing, sealing, main valve plug and the non-patch of the first inwall Close that the non-laminating of the intersegmental gap that exists, main valve plug and the second inwall is intersegmental exists gap.

Further, the longitudinal cross-section of the first laminating section and the longitudinal cross-section of the second laminating section are arc-shaped, the first inwall The circle at place, longitudinal cross-section of the first laminating section be the first circle, place, the longitudinal cross-section circle of the first laminating section of the second inwall is Second circle, the circle at the place, longitudinal cross-section of the second laminating section of the 3rd inwall is the 3rd circle, the second laminating section of the 4th inwall The circle at place, longitudinal cross-section is the 4th circle, and the first circle overlaps with the center of circle of the second circle, and the 3rd circle overlaps with the center of circle of the 4th circle, the The radius of one radius justified and the second circle is all equal with the radius of turn of one end of main valve plug, and the radius of the 3rd circle and the 4th is justified Radius is all equal with the radius of turn of the other end of main valve plug.

Further, the longitudinal cross-section of non-laminating section is arc-shaped, the longitudinal cross-section of the first non-laminating section of the first inwall The circle at place is the 5th circle, and place, the longitudinal cross-section circle of the non-laminating section of the second inwall is the 6th circle, the 5th circle and the first circle phase Handing over, the 6th circle intersects with the second circle, and the center of circle round compared with first, the center of circle of the 5th circle is close to oil return circuit, and the 6th round center of circle is relatively The center of circle of the second circle is close to oil return circuit.

Further, the center of circle of the first circle and the center of circle of the 3rd circle overlap, the radius of the first circle and the radius phase of the 3rd circle Deng, the center of circle of the 5th circle overlaps with the center of circle of the 6th circle, and the radius of the 5th circle and the radius of the 6th circle are equal, the center of circle of the first circle It is positioned on main valve plug rotational axis line.

Further, main valve plug includes first gear oiled-plate method and the second gear oiled-plate method being arranged side by side and leaving gap；

When oil circuit is in the first duty, one end of first gear oiled-plate method and the 4th inwall gluing, sealing, first gear oil Gap, one end of second gear oiled-plate method and the 3rd inwall gluing, sealing, second gear oiled-plate method is there is between the plate other end and the first inwall The other end and the second inwall between there is gap；When oil circuit is in the second duty, one end of first gear oiled-plate method and the 3rd Inwall gluing, sealing, the other end of first gear oiled-plate method and the first inwall gluing, sealing；When oil circuit is in three duties, second One end of oil baffle and the 4th inwall gluing, sealing, the other end of second gear oiled-plate method and the second inwall gluing, sealing.

Further, novel intercommunication pressure limiting banked direction control valves also includes 3-position-3-way spool, is provided with the second control in valve body Chamber, 3-position-3-way spool rotates and is arranged at the second control intracavity, and second controls chamber is connected by oil return circuit with the first control chamber, Second controls chamber is communicated with actuator port and oil return opening.

The beneficial effects of the utility model are:

The one novel intercommunication pressure limiting banked direction control valves that this utility model provides, valve body offers the first pressure limiting hole and second The first pressure limiting spool and the second pressure limiting spool it is respectively equipped with in pressure limiting hole, the first pressure limiting hole and the second pressure limiting hole.When the first work When pressure in oil circuit is higher than the preset pressure value of the first pressure limiting spool, the first pressure limiting spool action and by the first working oil path with Oil return circuit connects, thus keeps the pressure in positive first working oil path to remain at the preset pressure of the first pressure limiting spool Value；Equally, the second pressure limiting spool also can make the pressure in the second working oil path remain at the second pressure limiting spool in setting Force value.Thus ensureing that the oil pressure of the first working oil path and the second working oil path will not be too high, it is to avoid execution unit is because of oil pressure Too high and destroyed, it is to avoid the generation of security incident.

Accompanying drawing explanation

In order to be illustrated more clearly that the technical scheme of this utility model embodiment, will use required in embodiment below Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiment of the present utility model, the most should be by Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used To obtain other relevant accompanying drawings according to these accompanying drawings.

The structural representation of the novel intercommunication pressure limiting banked direction control valves that Fig. 1 provides for this utility model embodiment；

Fig. 2 is the scheme of installation of the first pressure limiting spool shown in Fig. 1；

Fig. 3 is the first working state figure of the oil circuit shown in Fig. 1；

Fig. 4 is the second duty degree of the oil circuit shown in Fig. 1；

Fig. 5 is the 3rd duty degree of the oil circuit shown in Fig. 1.

In figure, reference is:

Valve body 100；Oil-feed oil circuit 110；Oil-feed interface 111；Oil return circuit 120；Overfall 121；First working oil path 130；Second working oil path 140；First controls chamber 150；First inwall 151；Non-laminating section 1511；First laminating section 1512；The Two inwalls 152；3rd inwall 153；Second laminating section 1531；4th inwall 154；First pressure limiting hole 160；First hole section 161；The Two hole sections 162；Second pressure limiting hole 170；Second controls chamber 180；Actuator port 181；Oil return opening 182；Main valve plug 200；First gear Oiled-plate method 210；Second gear oiled-plate method 220；First pressure limiting spool 300；Fixed body 310；Spring 320；Steel ball 330；Second pressure limiting spool 400；3-position-3-way spool 500.

Detailed description of the invention

For making the purpose of this utility model embodiment, technical scheme and advantage clearer, new below in conjunction with this practicality Accompanying drawing in type embodiment, is clearly and completely described the technical scheme in this utility model embodiment, it is clear that retouched The embodiment stated is a part of embodiment of this utility model rather than whole embodiments.Generally described in the accompanying drawing herein and The assembly of this utility model embodiment illustrated can be arranged with various different configurations and design.

Therefore, below the detailed description of the embodiment of the present utility model provided in the accompanying drawings is not intended to limit requirement The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in this utility model Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all Belong to the scope of this utility model protection.

It should be noted that in the case of not conflicting, the embodiment in this utility model and the feature in embodiment can To be mutually combined.

It should also be noted that similar label and letter represent similar terms, therefore, the most a certain Xiang Yi in following accompanying drawing Individual accompanying drawing is defined, then need not it be defined further and explains in accompanying drawing subsequently.

In description of the present utility model, it should be noted that the orientation of the instruction such as term " interior ", " outward " or position relationship For based on orientation shown in the drawings or position relationship, or the orientation usually put when this utility model product uses or position Relation, or the orientation that usually understands of those skilled in the art or position relationship, or when this utility model product uses The orientation usually put or position relationship, be for only for ease of description this utility model and simplify description rather than instruction or dark The device or the element that show indication must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right Restriction of the present utility model.Describe additionally, term " first ", " second ", " the 3rd " etc. are only used for distinguishing, and it is not intended that refer to Show or imply relative importance.

In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " sets Put ", should be interpreted broadly " installation ", " connection ", connect for example, it may be fixing, it is also possible to be to removably connect, or integratedly Connect；Can be to be directly connected to, it is also possible to be indirectly connected with by intermediary.For the ordinary skill in the art, Above-mentioned term concrete meaning in this utility model can be understood with concrete condition.

Embodiment

As it is shown in figure 1, this utility model embodiment provides a kind of novel intercommunication pressure limiting banked direction control valves, it is used for controlling enforcement division The forward and reverse motion of part, in the present embodiment, execution unit is the rear-guard assembly of tractor.Pressure limiting banked direction control valves specifically includes valve body 100, main valve plug the 200, first pressure limiting spool the 300, second pressure limiting spool 400 and 3-position-3-way spool 500 etc..Valve body 100 is used for Each spool is installed.In the present embodiment, valve body 100 is monolithic construction, after all parts is installed on valve body 100, can make limit Pressure banked direction control valves has preferable sealing property, is difficult to oil leakage phenomenon occur.

Wherein, valve body 100 is internal is provided with oil circuit, the first control chamber 150 and the second control chamber 180, and second controls chamber 180 even Being connected with actuator port 181 and oil return opening 182, main valve plug 200 rotation is arranged in the first control, 3-position-3-way spool 500 rotates It is arranged in the second control chamber 180.Oil circuit is used for delivering oil, and oil circuit includes oil-feed oil circuit 110, oil return circuit the 120, first work Make oil circuit 130 and the second working oil path 140, oil-feed oil circuit 110, oil return circuit the 120, first working oil path 130 and the second work Oil circuit 140 all controls chamber 150 with first and connects, and the conversion of oil circuit is realized by the rotation of main valve plug 200.

Oil-feed oil circuit 110 is provided with oil-feed interface 111 away from first one end controlling chamber 150, for being connected with oil pump, and oil pump In fluid can be delivered in the first control chamber 150 by oil-feed interface 111 and oil-feed oil circuit 110.Oil return circuit 120 can be with Second controls chamber 180 connects, it is also possible to directly connect with oil sump tank, and in the present embodiment, oil return circuit 120 and second controls chamber 180 connect, and the first control chamber 150 and the second control chamber 180 are in series connection, and the conversion of oil circuit is the most easy and convenient.First Working oil path 130 and the second working oil path 140 and make it normally work in fluid is delivered to execution unit, the i.e. first work Make oil circuit 130 all to connect with execution unit inside with the second working oil path 140.Additionally, oil return circuit 120 controls chamber away from second One end of 180 is additionally provided with overfall 121, can enter second oil pressure that control in chamber 180 after arranging overflow spool in overfall 121 Row pressure limiting.

3-position-3-way spool 500 mainly realizes oil return circuit 120 and the connection of actuator port 181 or disconnection.The present embodiment In mainly apply to the rise and fall of tractor trailer.

Main valve plug 200 be mainly used in realizing oil-feed oil circuit 110 connect with the first working oil path 130 with oil-feed oil circuit 110 and Conversion between second working oil path 140 connection.If oil-feed oil circuit 110 connects with the first working oil path 130, then the second working oil Road 140 connects with oil return circuit 120, and now, execution unit (rear-guard assembly) is positive movement；If oil-feed oil circuit 110 and second Working oil path 140 connects, then the first working oil path 130 connects with oil return circuit 120, and now, execution unit (rear-guard assembly) is Adverse movement.The forward of execution unit, the fluid of direction motion is driven to be all from and oil-feed oil circuit 110, and in oil-feed oil circuit 110 Fluid come from oil pump.Generally the output oil pressure of oil pump is higher, and the first work in execution unit positive movement Make the oil pressure of oil circuit 130, the oil pressure of the second working oil path 140 in execution unit adverse movement is all difficult to too high, too high appearance Easily execution unit is caused damage.

To this end, be further opened with the first pressure limiting hole 160 and the second pressure limiting hole 170 on valve body 100, the first pressure limiting spool 300 sets It is placed in the first pressure limiting hole 160, for controlling the first working oil path 130 and the connection of oil return circuit 120 or disconnection；Second pressure limiting Spool 400 is located in the second pressure limiting hole 170, and the second pressure limiting spool 400 is for controlling the second working oil path 140 and oil return circuit The connection of 120 or disconnection.

As in figure 2 it is shown, in the present embodiment, the first pressure limiting spool 300 includes fixed body 310, spring 320 and steel ball 330, bullet One end of spring 320 is connected with steel ball 330, and the other end of spring 320 is connected with fixed body 310.First pressure limiting hole 160 is through returning Oil oil circuit 120 is also divided into the first hole section 161 and the second hole section 162 by described oil return circuit 120, and the first hole section 161 is shoulder hole, First working oil path 130 is connected by the first hole section 161 with oil return circuit 120, and fixed body 310 is bolted in the second hole section 162, Steel ball 330 is positioned at the first hole section 161 and formation is tightly connected.Can by adjusting the spacing between fixed body 310 and steel ball 330 Change the elastic force of just spring 320, thus realize the preset pressure value of the second pressure limiting spool 400 is adjusted.When the first working oil When pressure in road 130 is more than preset pressure value (spring force) of the second pressure limiting spool 400, steel ball 330 will be near fixing The direction motion of body 310, the first working oil path 130 connects with oil return circuit 120 the most at last so that the first working oil path 130 Oil pressure is consistently equal to the preset pressure value of the first pressure limiting spool 400, it is ensured that the safety of execution unit positive movement.

The first above-mentioned pressure limiting spool 300 structure is relatively simple, it is easy to realizes the pressure limiting to the first working oil path 130 and makees With.First pressure limiting hole 160 is rationally distributed, easy to process.Certainly, the structure of the first pressure limiting spool 300 and the first pressure limiting hole 160 Structure and arrangement thereof are in no way restricted in the present embodiment, as long as when oil pressure in the first working oil path 130 reaches the During the higher limit of one pressure limiting spool 300, the first pressure limiting spool 300 can cut off or connect the first working oil path 130 and oil return oil The pressure limiting oil circuit that road 120 is formed.

In the present embodiment, the second pressure limiting spool 400 is identical with the structure of the first pressure limiting spool 300, and the second pressure limiting hole 170 is used In connection oil return circuit 120 and the second working oil path 140, the second pressure limiting hole 170 and structure i.e. side of layout in the first pressure limiting hole 160 Formula is identical, does not repeats them here.

Main valve plug 200, in addition to having oil circuit control and realizing the positive and negative motor function of execution unit, also has oil circuit control real Existing execution unit stops function.Being i.e. 3-position 4-way spool at main valve plug 200, under the effect of main valve plug 200, oil circuit possesses three Kind duty:

First duty: can be oil-feed oil circuit 110, oil return circuit the 120, first working oil path 130 and the second work Oil circuit 140 connects mutually, it is also possible to be that only oil-feed oil circuit 110 connects with oil return circuit 120.In the present embodiment, preferably before Person.Fluid in oil-feed oil circuit 110 directly flows out from oil return circuit 120 in the first operative state, without going past the first work Making oil circuit 130 and the second working oil path 140, now, execution unit is in halted state.First working oil path 130 at the same time Can enter in oil return circuit 120 by the first control chamber 150 with the remaining fluid in the second working oil path 140, it is ensured that the first work Make in oil circuit the 130, second working oil path 140 and execution unit without remaining fluid, extend the service life of execution unit.

Second duty: the first working oil path 130 connects with oil-feed oil circuit 110, the second working oil path 140 and oil return oil Road 120 connects, and now, execution unit is positive movement.

3rd duty: the second working oil path 140 connects with oil-feed oil circuit 110, the first working oil path 130 and oil return oil Road 120 connects, and now, execution unit is adverse movement.

Realize the structure of above-mentioned three kinds of states and limit, can be various structures.In the present embodiment, as it is shown on figure 3, first The inwall in control chamber 150 includes the first inwall the 151, second inwall the 152, the 3rd inwall 153 and the 4th inwall being sequentially arranged 154, oil return circuit 120 is between the first inwall 151 and the second inwall 152, and the second working oil path 140 is positioned at the second inwall 152 and the 3rd between inwall 153, oil-feed oil circuit 110 between the 3rd inwall 153 and the 4th inwall 154, the first working oil path 130 between the 4th inwall 154 and the first inwall 151.

Oil circuit to be made has above-mentioned three kinds of duties, and the first inwall controlling chamber 150 need to meet certain condition, and i.e. first Inwall 151 and the second inwall 152 are divided at least two part, are defined as non-laminating section 1511 and the first laminating section 1512, often Length and the quantity of part do not limit.3rd inwall 153 and a 4th inwall 154 all at least part, is defined as the second patch Close section 1531.Main valve plug 200 can simultaneously with the first laminating section 1512 and the second laminating section 1531 gluing, sealing, but main valve plug No matter 200 be in and where contact all without the non-laminating section 1511 with the first inwall 151 and the second inwall 152.

In the present embodiment, for realizing main valve plug 200 and the first laminating section 1512 and gluing, sealing of the second laminating section 1531, Preferably, the first laminating section 1512 of the first laminating longitudinal cross-section of section 1512 of the first inwall 151, the second inwall 152 is vertical To cross section, the second laminating longitudinal cross-section of section 1531 of the 3rd inwall 153, the second laminating section 1531 vertical of the 4th inwall 154 To cross section, the longitudinal direction of the non-laminating section 1511 of the longitudinal cross-section of the non-laminating section 1511 of the first inwall 151 and the second inwall 152 cuts Face is arc-shaped, successively the circle at the place, longitudinal cross-section of various piece is defined as first circle, second circle, the 3rd circle, the 4th Circle, the 5th circle and the 6th circle.

Wherein, the second duty of oil circuit to be realized and the 3rd duty, it is preferable that the first circle and the second circle are with one heart Arranging, the radius of the first circle and the radius of the second circle are all equal with the radius of turn of one end of main valve plug 200；3rd circle and the 4th Circle is arranged concentrically, and the radius of the 3rd circle and the radius of the 4th circle are all equal with the radius of turn of the other end of main valve plug 200.

Certainly, if the first circle and the 3rd circle are arranged concentrically, then main valve plug 200 and the first circle are for being arranged concentrically, the i.e. first circle The center of circle be positioned on the rotational axis line of main valve plug 200；If the first circle and the 3rd circle non-concentric are arranged, then main valve plug 200 and the One circle is set for the eccentric, i.e. the radius of turn of main valve plug 200 even end.In the present embodiment, control chamber 150 for convenience of first Processing, preferably the former.

Additionally, the first duty of oil circuit to be realized, it is preferable that the 5th circle intersects with the first circle, and the 6th circle is with second Circle intersects.The center of circle that 5th center of circle justified is justified compared with first is close to oil return circuit 120, and the 5th diameter of a circle is straight less than the first circle Footpath；The center of circle that 6th center of circle justified is justified compared with two is close to oil return circuit 120, and the 6th diameter of a circle is less than the 5th diameter of a circle.When So, the 6th circle can overlap with the 5th circle, it is also possible to misaligned, and the radius of the 6th circle and the radius of the 5th circle can equal also may be used With, in the present embodiment, overlap and both radius phase for convenience of the first processing controlling chamber 150, the 6th circle and the 5th circle Deng.

Additionally, the structure of main valve plug 200 is unrestricted, can be block, centre arranges through hole etc. and realizes the first work shape Oil-feed oil circuit 110 under state connects with oil return circuit 120, it is possible to use other structures to realize, and provides a kind of excellent in the present embodiment The concrete structure of the main valve plug 200 of choosing.

Main valve plug 200 is rotary spool, it first gear oiled-plate method 210 including being arranged side by side and leave gap and second gear oil Plate 220.First gear oiled-plate method 210 and second gear oiled-plate method 220 can control chamber 150 inter-sync first and rotate.

When oil circuit is in the first duty, as it is shown on figure 3, one end of first gear oiled-plate method 210 and the 4th inwall 154 Second laminating section 1531 gluing, sealing, between the other end of first gear oiled-plate method 210 and the non-laminating section 1511 of the first inwall 151 exist Gap, the second laminating section 1531 gluing, sealing of one end of second gear oiled-plate method 220 and the 3rd inwall 153, second gear oiled-plate method 220 another Gap is there is in one end with the non-laminating section 1511 of the second inwall 152.

When oil circuit is in the second duty, as shown in Figure 4, one end of first gear oiled-plate method 210 and the 3rd inwall 153 Second laminating section 1531 gluing, sealing, the other end of first gear oiled-plate method 210 and the first laminating section 1512 of the first inwall 151 are fitted Seal；One end of second gear oiled-plate method 220 and the second laminating section 1531 gluing, sealing of the 3rd inwall 153, second gear oiled-plate method 220 There is gap in the non-laminating section 1511 of the other end and the first inwall 151.

When oil circuit is in three duties, as it is shown in figure 5, one end of second gear oiled-plate method 220 and the 4th inwall 154 Second laminating section 1531 gluing, sealing, the other end of second gear oiled-plate method 220 and the first laminating section 1512 of the second inwall 152 are fitted Seal；One end of first gear oiled-plate method 210 and the second laminating section 1531 gluing, sealing of the 4th inwall 154, first gear oiled-plate method 210 There is gap in the non-laminating section 1511 of the other end and the second inwall 152.

Additionally, in other embodiments of the present utility model, the second control chamber 180 and three in valve body 100, can be not provided with Three-way valve core 500, oil return circuit 120 directly connects with oil sump tank.

These are only preferred embodiment of the present utility model, be not limited to this utility model, for this area Technical staff for, this utility model can have various modifications and variations.It is all within spirit of the present utility model and principle, Any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.

Claims (10)

1. a novel intercommunication pressure limiting banked direction control valves, for controlling the forward and reverse motion of execution unit, it is characterised in that include Valve body and main valve plug, be provided with in described valve body oil circuit and first control chamber, described oil circuit include oil-feed oil circuit, oil return circuit, First working oil path and the second working oil path, described first working oil path and described second working oil path are used for and described enforcement division The internal connection of part, described oil-feed oil circuit, described oil return circuit, described first working oil path and described second working oil path are all and institute Stating the first control chamber connection, described main valve plug is located at described first and is controlled intracavity and for controlling the conversion of described oil circuit；

Offer the first pressure limiting hole and the second pressure limiting hole on described valve body, in described first pressure limiting hole, be provided with the first pressure limiting spool, Being provided with the second pressure limiting spool in described second pressure limiting hole, described first pressure limiting spool can be by described first working oil path with described Oil return circuit connection or cut off, described second pressure limiting spool described second working oil path can be connected with described oil return circuit or Cut off.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 1, it is characterised in that described first pressure limiting spool includes Fixed body, spring and steel ball, described steel ball is connected by described spring with described fixed body, and described fixed body and described valve body can Dismounting connects, and described first working oil path connects and formed pressure limiting oil circuit with described oil return circuit by described first pressure limiting hole, Described steel ball is used for connecting or cut off described pressure limiting oil circuit.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 2, it is characterised in that described first pressure limiting hole through Described oil return circuit is also divided into the first hole section and the second hole section, described first working oil path and described oil return by described oil return circuit Oil circuit is connected by described first hole section, and described fixation postures is in described second hole section, and described steel ball is positioned at described first hole Section is interior and formation is tightly connected.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 1, it is characterised in that described main valve plug is 3-position 4-way Spool, described main valve plug rotates and described oil circuit can be made to be in three kinds of duties, the respectively first duty, the second work State and the 3rd duty, when described oil circuit is in described first duty, described oil-feed oil circuit, described oil return circuit, Described first working oil path connects mutually with described second working oil path；When described oil circuit is in described second duty, Described oil-feed oil circuit connects with described first working oil path, and described second working oil path connects with described oil return circuit；Described oil When road is in described three duty, described oil-feed oil circuit connects with described second working oil path, described first working oil path Connect with described oil return circuit.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 4, it is characterised in that described first controls the inwall in chamber It is arranged at described first inwall and described including the first inwall, the second inwall, the 3rd inwall and the 4th inwall, described oil return circuit Between second inwall, described second working oil path is located between described second inwall and described 3rd inwall, described oil-feed oil circuit Being located between described 3rd inwall and described 4th inwall, described first working oil path is located at described 4th inwall and described first Between inwall；

Described first inwall and described second inwall all include non-laminating section and the first laminating section, described 3rd inwall and described the Four inwalls include the second laminating section, described main valve plug can simultaneously with described first laminating section, the second laminating section gluing, sealing, institute State the non-laminating section of the intersegmental gap that exists of non-laminating of main valve plug and described first inwall, described main valve plug and described second inwall Between there is gap.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 5, it is characterised in that the longitudinal direction of described first laminating section The longitudinal cross-section of cross section and described second laminating section is arc-shaped, the place, longitudinal cross-section of the first laminating section of described first inwall Circle be first circle, described second inwall first laminating section place, longitudinal cross-section circle be second justify, described 3rd inwall The circle at the place, longitudinal cross-section of the second laminating section is the 3rd circle, the place, longitudinal cross-section of the second laminating section of described 4th inwall Circle is the 4th circle, and the first circle overlaps with the center of circle of the second circle, and described 3rd circle overlaps with the center of circle of the 4th circle, described first circle The radius of radius and described second circle is all equal with the radius of turn of one end of described main valve plug, the radius of described 3rd circle and institute The radius stating the 4th circle is all equal with the radius of turn of the other end of described main valve plug.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 6, it is characterised in that the longitudinal direction of described non-laminating section is cut Face is arc-shaped, and the circle at the place, longitudinal cross-section of the first non-laminating section of described first inwall is the 5th circle, described second inwall Place, the longitudinal cross-section circle of non-laminating section be the 6th circle, described 5th circle intersects with described first circle, described 6th circle and institute Stating the second circle to intersect, the center of circle of more described first circle in the center of circle of described 5th circle is close to described oil return circuit, and the described 6th is round The center of circle more described second circle the center of circle close to described oil return circuit.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 7, it is characterised in that the center of circle and the of described first circle The center of circle of three circles overlaps, and the radius of described first circle is equal with the radius of described 3rd circle, and the center of circle of described 5th circle is with described The center of circle of the 6th circle overlaps, and the radius of described 5th circle is equal with the radius of described 6th circle, and the center of circle of described first circle is positioned at On described main valve plug rotational axis line.

Novel intercommunication pressure limiting banked direction control valves the most according to claim 8, it is characterised in that described main valve plug includes setting side by side Put and leave first gear oiled-plate method and the second gear oiled-plate method in gap；

When described oil circuit is in the first duty, one end of described first gear oiled-plate method and described 4th inwall gluing, sealing, Gap, one end of described second gear oiled-plate method and the described 3rd is there is between the described first gear oiled-plate method other end and described first inwall , between the other end and described second inwall of described second gear oiled-plate method, there is gap in inwall gluing, sealing；Described oil circuit is in During two duties, one end of described first gear oiled-plate method and described 3rd inwall gluing, sealing, another of described first gear oiled-plate method End and described first inwall gluing, sealing；When described oil circuit is in three duties, one end of described second gear oiled-plate method and institute State the 4th inwall gluing, sealing, the other end of described second gear oiled-plate method and described second inwall gluing, sealing.

10. according to the novel intercommunication pressure limiting banked direction control valves described in any one of claim 1-9, it is characterised in that described novel mutually Formula pressure limiting banked direction control valves also includes 3-position-3-way spool, is provided with the second control chamber, described 3-position-3-way spool in described valve body Rotation is arranged at described second and controls intracavity, and described second controls chamber controls chamber by described oil return circuit even with described first Logical, described second controls chamber is communicated with actuator port and oil return opening.