CN209876024U - Hydraulic transmission device and engineering machinery with same - Google Patents
Hydraulic transmission device and engineering machinery with same Download PDFInfo
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- CN209876024U CN209876024U CN201920508201.0U CN201920508201U CN209876024U CN 209876024 U CN209876024 U CN 209876024U CN 201920508201 U CN201920508201 U CN 201920508201U CN 209876024 U CN209876024 U CN 209876024U
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Abstract
The utility model provides a hydraulic conduction device and engineering machine tool who has it, hydraulic conduction device includes: the valve body is internally limited with a main valve cavity and a fixed-difference pressure-reducing valve cavity; the main valve core is movably arranged in the main valve cavity along the axial direction of the main valve cavity, a valve core hole extending along the axial direction of the main valve core is limited in the main valve core, a plurality of pore passages extending along the radial direction of the main valve core and communicated with the valve core hole are also arranged in the main valve core, and a plurality of throttling ports are also arranged in the main valve core; the fixed-difference pressure reducing valve core is movably arranged in the fixed-difference pressure reducing valve cavity to control the connection and disconnection of the fixed-difference pressure reducing valve cavity and the first channel and adjust the pressure difference between the P port oil duct and the working port oil duct; a damper; a first pressure limiting valve; a second pressure limiting valve. The utility model discloses a through the cooperation of main valve core and valve body, the pressure of working fluid port always can be drawn forth, and the pressure that makes the oil return hydraulic fluid port is selected the oil duct and is blocked up, does not influence the accuracy of selecting the signal, makes simultaneously not communicate with each other with the communicating voltage limiting chamber of working fluid port and draining port T.
Description
Technical Field
The utility model relates to an engineering machine tool field especially relates to a hydraulic conduction device and engineering machine tool who has it.
Background
At present, the multi-way valve is widely used in engineering machinery, and in the using process of part of the multi-way valves, a hydraulic pressure signal of a working oil port and an oil return oil port need to be isolated, the pressure signal of the working oil port is led out, and the pressure signal acts on other valve cores to control the pressure of the whole valve.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a hydraulic transmission device, this hydraulic transmission device simple structure, the control of being convenient for.
The utility model also provides an engineering machine tool with above-mentioned hydraulic conduction device.
According to the utility model discloses hydraulic power conduction device of first aspect embodiment includes: the valve body is provided with an A port oil duct, a B port oil duct, two T oil ducts, a first pressure limiting cavity and a second pressure limiting cavity which are communicated with the main valve cavity, the first pressure limiting cavity and the second pressure limiting cavity are respectively positioned at two ends of the main valve cavity, and the valve body is also provided with a P oil duct communicated with the constant-differential pressure reducing cavity and a first channel and a second channel communicated with the main valve cavity and the constant-differential pressure reducing valve cavity; the main valve core is movably arranged in the main valve cavity along the axial direction of the main valve cavity, a valve core hole extending along the axial direction of the main valve core is limited in the main valve core, a plurality of pore passages extending along the radial direction of the main valve core and communicated with the valve core hole are further arranged in the main valve core, and a plurality of throttling ports are further formed in the main valve core; the fixed-difference pressure reducing valve core is movably arranged in the fixed-difference pressure reducing valve cavity to control the connection and disconnection of the fixed-difference pressure reducing valve cavity and the first channel and adjust the pressure difference between the P oil channel and the working port oil channel; the damper is arranged in the fixed-differential pressure reducing valve cavity to adjust the flow of the second channel and the fixed-differential pressure reducing valve cavity; the first pressure limiting valve is arranged at one end of the valve body and communicated with the first pressure limiting cavity, and the first pressure limiting valve can control the maximum oil pressure of the oil passage A; and the second pressure limiting valve is arranged at the other end of the valve body and is communicated with the second pressure limiting cavity, and the second pressure limiting valve can control the maximum oil pressure of the oil passage at the port B.
According to the utility model discloses hydraulic conduction device can also have following additional technical characterstic:
according to the utility model discloses an embodiment, from the one end of valve body is spaced apart in proper order to the other end and is equipped with first passageway first pressure limiting cavity, one the T oil duct A mouthful of oil duct the second passageway B mouthful of oil duct, another the T oil duct advance with second pressure limiting cavity.
According to the utility model discloses an embodiment, from the one end of main valve core is spaced apart in proper order to the other end and is equipped with first pore, first throttle mouth, second pore, second throttle mouth, third pore, fourth throttle mouth and fourth pore, main valve core is movable in order to control the intercommunication of different pore and different oil ducts or passageway.
According to the utility model discloses an embodiment, be equipped with on the fixed differential pressure relief valve core can with the fifth throttle mouth of second passageway intercommunication.
According to the utility model discloses an embodiment, A mouthful oil duct B mouthful oil duct, two the T oil duct is followed respectively main valve chamber's radial extension, the P oil duct is followed the radial extension of definite difference relief valve chamber.
According to the utility model discloses an embodiment, the constant-differential pressure relief valve chamber includes: the first cavity section extends along the axial direction of the valve body and is communicated with the first channel, and the fixed-difference pressure reducing valve core is movably arranged in the first cavity section along the axial direction of the first cavity section; the damper comprises a first cavity section, a second cavity section, a damper body and a damper, wherein the first cavity section is arranged at one end of the valve body, the damper body is arranged in the first cavity section, the damper body is arranged in the second cavity section, the second cavity section is arranged at the other end of the first cavity section in a manner of extending along the axial direction of the valve body, one end of the second cavity section is communicated with the first cavity section, at least one part of the second cavity section is communicated with the second channel, the damper is arranged in the second cavity section, and the radial dimension of.
According to an embodiment of the present invention, the axis of the first cavity section and the axis of the second cavity section are not on the same line.
According to an embodiment of the present invention, the hydraulic conduction device further includes: and one end of the fixed-difference pressure-reducing valve core is inwards sunken to form an installation groove, one end of the elastic part is arranged in the installation groove, and the other end of the elastic part is stopped against the end surface of the first cavity section.
According to the utility model discloses an embodiment, the second passageway is established the mounting groove with between the main valve core, the second passageway is used for drawing forth the pressure of working oil port.
According to the second aspect embodiment of the present invention, the construction machine comprises the hydraulic transmission device of the above embodiment.
Drawings
Fig. 1 is a schematic structural view of a hydraulic conduction apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view of another embodiment of a hydraulic conduction device according to the present invention;
fig. 3 is a schematic view of another embodiment of a hydraulic conduction device according to the present invention.
Reference numerals:
the fluid power transmission device 100;
a valve body 10; an A port oil passage 11; an oil passage 12 at the port B; a T oil duct 13; a P oil passage 14; a first channel 15; a first pressure limiting chamber 16; a second pressure limiting chamber 17; a second channel 18;
main spool 20; a first porthole 21; a second porthole 22; a third orifice 23; a fourth orifice 24; a first orifice 25; a second orifice 26; a third orifice 27; a fourth orifice 28; a spool bore 29;
a constant-differential-pressure relief valve element 30; a fifth orifice 31; a spool oil passage 32;
a damper 40;
a first pressure limiting valve 50;
a second pressure limiting valve 60.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A hydraulic power transmission device 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings.
As shown in fig. 1 to 3, a hydraulic conduction device 100 according to an embodiment of the present invention includes a valve body 10, a main spool 20, a differential pressure reducing spool 30, a damper 40, a first pressure limiting valve 50, and a second pressure limiting valve 60.
Specifically, a main valve cavity and a fixed-differential pressure reducing valve cavity are defined in the valve body 10, the main valve cavity and the fixed-differential pressure reducing valve cavity are arranged in a spaced manner along the radial direction of the valve body 10 and respectively penetrate through the valve body 10 in the axial direction, the valve body 10 is provided with an a port oil duct 11, a B port oil duct 12, two T oil ducts 13, a first pressure limiting cavity 16 and a second pressure limiting cavity 17, the first pressure limiting cavity 16 and the second pressure limiting cavity 17 are respectively positioned at two ends of the main valve cavity, the valve body 10 is further provided with a P oil duct 14 communicated with the fixed-differential pressure reducing valve cavity and a first passage 15 and a second passage 18 communicated with the main valve cavity and the fixed-differential pressure reducing valve cavity, the main valve core 20 is movably arranged in the main valve cavity in the axial direction of the main valve cavity, a valve core hole 29 extending in the axial direction of the main valve core 20 is defined in the main valve core 20, a plurality of pore passages extending in the radial direction of the main valve core 20 and, the constant-difference pressure reducing valve core 30 is movably arranged in the constant-difference pressure reducing valve cavity to control the on-off of the constant-difference pressure reducing valve cavity and the first passage 15 and adjust the pressure difference between the P oil passage 14 and the working port oil passage, the damper 40 is arranged in the constant-difference pressure reducing valve cavity to adjust the flow of the second passage 18 and the constant-difference pressure reducing valve cavity, the first pressure limiting valve 50 is arranged at one end of the valve body 10 and communicated with the first pressure limiting cavity 16, the first pressure limiting valve 50 can control the maximum oil pressure of the A port oil passage 11, the second pressure limiting valve 60 is arranged at the other end of the valve body 10 and communicated with the second pressure limiting cavity 17, and the second pressure limiting valve 60 can control the maximum oil pressure of the B port oil passage 12.
In other words, the hydraulic transmission device 100 mainly comprises a valve body 10, a main valve element 20, a constant-pressure-difference pressure-reducing valve element 30, a damper 40, a first pressure-limiting valve 50 and a second pressure-limiting valve 60, wherein hydraulic oil is input into a P oil passage 14 in the valve body 10, an a oil passage 11 and a B oil passage 12 are respectively connected with an execution element, a T oil passage 13 is an oil relief port, and the T oil passage 13 is connected with an oil tank. Through the reversing of the main valve element 20, a plurality of throttling ports on the main valve element 20 form grooves on the valve body 10, a plurality of pore passages in the main valve element 20 are respectively used for being matched with the port A oil passage 11, the port B oil passage 12, the two T oil passages 13, the first pressure limiting cavity 16, the second pressure limiting cavity 17 and the grooves, so that the port A oil passage 11 or the port B oil passage 12 outputs working pressure and flow, meanwhile, the working pressure of the port A oil passage 11 or the port B oil passage 12 is selected, working pressure signals are respectively led to two ends of the valve body 10, and the output pressure of the port A, B can be respectively limited at two ends of the valve body 10. The valve body 10 is matched with the main valve core 20, the pressure of the working oil port is always led out, so that the pressure selecting oil passage of the oil return port is blocked, the accuracy of selecting signals is not influenced, meanwhile, a pressure limiting cavity which is not communicated with the working oil port is communicated with the T-shaped oil passage 13, the pressure limiting cavity is prevented from forming a closed cavity, and the work of the multi-way valve is influenced by leakage.
Furthermore, a main valve cavity and a constant-pressure-difference pressure-reducing valve cavity are arranged in the valve body 10, the first pressure-limiting valve 50 is communicated with the main valve cavity through the first pressure-limiting cavity 16, the second pressure-limiting valve 60 is communicated with the main valve cavity through the second pressure-limiting cavity 17, and when a pressure signal exceeds preset values of the first pressure-limiting valve 50 and the second pressure-limiting valve 60, a valve core of the constant-insertion pressure-reducing valve is closed, so that the purpose of limiting the maximum working pressure of the whole valve body 10 is achieved.
From this, according to the utility model discloses hydraulic transmission device 100 cooperatees through valve body 10 and main valve core 20, can lead to valve body 10 both ends respectively with pressure signal to can control the output pressure at valve body 10 both ends respectively, prevent that the voltage limiting chamber from forming closed chamber, be convenient for realize the control to whole valve pressure.
According to some embodiments of the utility model, separate in proper order from the one end of valve body 10 to the other end and be equipped with first passageway 15, first pressure limiting chamber 16, a T oil duct 13, A mouth oil duct 11, second passageway 18, B mouth oil duct 12, another T oil duct 13 advance with second pressure limiting chamber 17, simple structure, the valve body 10 of being convenient for and main valve core 20 mutually support.
In an embodiment of the present invention, a first hole 21, a first throttle 25, a second hole 22, a second throttle 26, a third throttle 27, a third hole 23, a fourth throttle 28 and a fourth hole 24 are sequentially spaced from one end of the main valve element 20 to the other end, and the main valve element 20 is movable to control the communication between different holes and different oil ducts or passages.
Optionally, the fixed differential relief spool 30 is provided with a fifth orifice 31 that can communicate with the second passage 18.
Preferably, the port a oil passage 11, the port B oil passage 12 and the two T oil passages 13 respectively extend in the radial direction of the main valve cavity, and the P oil passage 14 extends in the radial direction of the differential pressure relief valve cavity, and the structure is convenient to machine.
According to the utility model discloses an embodiment, the constant-differential pressure relief valve chamber includes first chamber section and second chamber section.
Specifically, the first cavity section extends along the axial direction of the valve body 10 and is communicated with the first channel 15, the fixed-differential-pressure relief valve core 30 is movably arranged in the first cavity section along the axial direction of the first cavity section, the second cavity section is arranged at the other end of the first cavity section along the axial direction of the valve body 10, one end of the second cavity section is communicated with the first cavity section, at least one part of the second cavity section is communicated with the second channel 18, the damper 40 is arranged in the second cavity section, and the radial dimension of the second cavity section is smaller than that of the first cavity section.
It should be noted that the constant-pressure-difference pressure-reducing valve core 30 is arranged in the constant-pressure-difference pressure-reducing valve cavity to form a constant-pressure-reducing valve, and when the working pressure is fed back to the constant-pressure-reducing valve, the working pressure passes through the damper 40, and the stability and the response speed of the constant-pressure-difference pressure-reducing valve are ensured by adjusting the flow area of the damper 40, so that the pressure feedback system can be applied to various types of engineering machinery.
Optionally, the axes of the first and second cavity segments are not collinear.
According to still other embodiments of the present invention, the hydraulic conducting apparatus 100 further includes an elastic member 70, one end of the differential relief valve core 30 is recessed inward to form a mounting groove, one end of the elastic member 70 is disposed in the mounting groove, and the other end of the elastic member abuts against the end surface of the first cavity section.
Specifically, the elastic member 70 may be a spring, and the groove on the valve body 10 cooperates with the movement of the valve core to guide the pressure of the working oil port to the spring end of the fixed-differential pressure-reducing valve core 30, and the pressure in the second passage 18 acts on the end of the fixed-differential pressure-reducing valve far away from the spring through the valve core oil passage 32 in the fixed-differential pressure-reducing valve core 30, so that the flow of the working oil port is only related to the opening area of the valve core and is unrelated to the change of the working pressure through the function of the fixed-differential pressure-reducing valve core 30.
A second passage 18 is provided between the mounting groove and the main spool 20, the second passage 18 being used to draw out the pressure of the working port.
The operation of the hydraulic conduction apparatus 100 according to the embodiment of the present invention will be described in detail below.
As shown in fig. 2, the main spool 20 moves leftward, the pressure oil flows in through the P oil gallery 14, enters the second passage 18 through a fifth throttle 31 between the constant differential pressure reducing valve and the valve body 10, and then acts on the a port oil gallery 11 through a second throttle 26 on the main spool 20, the second port 22 is selected to introduce the working pressure of the a port oil gallery 11, and the pressure oil is transmitted to the first port 21 and the fourth port 24, wherein the first port 21 introduces the pressure oil into the first passage 15, and acts on the left end of the constant differential pressure reducing valve after the flow limitation of the damper 40; the fourth pore canal 24 leads the pressure oil to the second pressure limiting cavity 17 of the valve body 10, and the second pressure limiting cavity 17 is communicated with the second pressure limiting valve 60, because the second pore canal 22, the fourth pore canal 24, the first pore canal 21 and the first channel 15 are communicated with each other at the moment, the pressure oil led in by the second pore canal 22 can be limited through the second pressure limiting valve 60, and the opening area of the fixed-difference pressure reducing valve is further controlled, so that the output working pressure of the port A oil duct 11 is limited. The oil in the B port gallery 12 (working port) can flow into the T gallery 13 through the fourth orifice 28 in the main spool 20 and return to the oil tank.
Further, after the main valve element 20 moves leftward, the selected third orifice 23 is blocked by matching the valve element with the valve body 10, so that the selected third orifice 23 is isolated from the B-port oil duct 12 (oil return port), and therefore the selected third orifice 23 has no influence on pressure oil introduced by the selected second orifice 22, and meanwhile, the selected first pressure limiting cavity 16 is communicated with the T-port oil duct 13, so that the pressure of the first pressure limiting cavity 16 cannot be suppressed, and the pressure of the first passage 15 cannot be influenced by leakage of the pressure in the first pressure limiting cavity 16.
Further, after the main spool 20 moves to the left, the oil passage in the constant-differential pressure reducing valve guides the pressure oil at the second passage 18 to the right end of the constant-differential pressure reducing spool 30, and the pressure oil at the left end of the constant-differential pressure reducing spool 30 is guided from the port a oil passage 11, that is, the two ends of the constant-differential pressure reducing spool 30 respectively act on the oil inlet pressure and the oil outlet pressure of the main spool 20, according to the principle of the constant-differential pressure reducing valve, the difference between the oil inlet pressure and the oil outlet pressure of the main spool 20 remains unchanged and is not influenced by the working pressure a, and further the output flow of the whole pressure feedback system is determined only by the flow area of the main spool 20 and is irrelevant to the change of the working pressure a.
As shown in fig. 3, the main spool 20 moves rightward, the pressure oil flows in through the P oil gallery 14, passes through a fifth throttle 31 between the constant pressure differential relief valve and the valve body 10, enters the second passage 18, passes through a third throttle 27 on the main spool 20, acts on the B port oil gallery 12, selects a third hole passage 23 to introduce the working pressure oil of the B port oil gallery 12, and transmits the pressure oil to the first hole passage 21, wherein the first hole passage 21 introduces the pressure oil into the first passage 15 and the first pressure limiting cavity 16 of the valve body 10, and acts on the left end of the constant pressure differential relief valve after the flow limitation of the damper 40, and simultaneously the first pressure limiting cavity 16 introduces the pressure oil to the first pressure limiting valve 50, because the third hole passage 23, the first hole passage 21, the first pressure limiting cavity 16, and the first passage 15 are communicated with each other at this time, the pressure oil introduced by the second hole passage 22 can be limited by the first pressure limiting valve 50, and further controls the opening area of the constant pressure differential relief valve, thereby limiting the output working pressure of the B port oil passage 12. Oil in the port a gallery 11 (working port) can flow into the T gallery 13 through the first orifice 25 in the main spool 20 and return to the tank.
Further, after the main valve element 20 moves rightwards, the selected second duct 22 is blocked through the matching between the valve element and the valve body 10, so that the selected second duct 22 is isolated from the oil duct 11 (oil return port) with the port a, the selected second duct 22 has no influence on pressure oil introduced through the selected third duct 23, meanwhile, the selected second pressure limiting cavity 17 is communicated with the T oil duct 13, the second pressure limiting cavity 17 cannot be subjected to pressure suppression, and the pressure in the second pressure limiting cavity 17 cannot be influenced by leakage to further influence the pressure at the position of the first passage 15.
As shown in fig. 3, after the main spool 20 moves to the right, the oil passage leads the pressure oil at the second passage 18 to the right end of the constant-differential pressure reducing spool 30, and simultaneously the pressure oil at the left end of the constant-differential pressure reducing spool 30 is led from the oil passage at the port 12 of the port B, that is, the two ends of the constant-differential pressure reducing spool respectively act on the oil inlet pressure and the oil outlet pressure of the main spool 20, according to the principle of constant-differential pressure reducing, the difference between the oil inlet pressure and the oil outlet pressure of the main spool 20 will remain unchanged and is not influenced by the working pressure B, and further the output flow of the whole pressure feedback system is determined only by the flow area of the main spool 20 and is not related to the change of the working pressure B.
In summary, according to the hydraulic transmission device 100 of the embodiment of the present invention, the valve body 10 is matched with the main valve element 20, so that the pressure signal can be respectively introduced to two ends of the valve body 10, and the output pressures at two ends of the valve body 10 can be respectively controlled, thereby preventing the pressure limiting cavity from forming a closed cavity, and facilitating the control of the pressure of the whole valve.
According to the utility model discloses engineering machine tool includes according to the hydraulic conduction device 100 of above-mentioned embodiment, because according to the utility model discloses the hydraulic conduction device 100 of above-mentioned embodiment has above-mentioned technological effect, consequently, according to the utility model discloses engineering machine tool also has corresponding technological effect, is convenient for realize the control to the whole valve pressure.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A fluid power transmission device, comprising:
the valve body is provided with an A port oil duct, a B port oil duct, two T oil ducts, a first pressure limiting cavity and a second pressure limiting cavity which are communicated with the main valve cavity, the first pressure limiting cavity and the second pressure limiting cavity are respectively positioned at two ends of the main valve cavity, and the valve body is also provided with a P oil duct communicated with the constant-difference pressure reducing cavity and a first channel and a second channel communicated with the main valve cavity and the constant-difference pressure reducing valve cavity;
the main valve core is movably arranged in the main valve cavity along the axial direction of the main valve cavity, a valve core hole extending along the axial direction of the main valve core is limited in the main valve core, a plurality of pore passages extending along the radial direction of the main valve core and communicated with the valve core hole are further arranged in the main valve core, and a plurality of throttling ports are further formed in the main valve core;
the fixed-difference pressure reducing valve core is movably arranged in the fixed-difference pressure reducing valve cavity to control the connection and disconnection of the fixed-difference pressure reducing valve cavity and the first channel and adjust the pressure difference between the P oil channel and the working port oil channel;
the damper is arranged in the fixed-differential pressure reducing valve cavity to adjust the flow of the second channel and the fixed-differential pressure reducing valve cavity;
the first pressure limiting valve is arranged at one end of the valve body and communicated with the first pressure limiting cavity, and the first pressure limiting valve can control the maximum oil pressure of the oil passage A;
and the second pressure limiting valve is arranged at the other end of the valve body and is communicated with the second pressure limiting cavity, and the second pressure limiting valve can control the maximum oil pressure of the oil passage at the port B.
2. The hydraulic transmission device as recited in claim 1, wherein the first passage, the first pressure limiting chamber, the T oil passage, the a oil passage, the second passage, the B oil passage, the T oil passage, and the second pressure limiting chamber are provided at intervals in this order from one end to the other end of the valve body.
3. A hydraulic conducting device as claimed in claim 1, wherein a first bore, a first restriction, a second bore, a second restriction, a third bore, a fourth restriction and a fourth bore are provided spaced apart in sequence from one end of the main valve element to the other end, the main valve element being movable to control the communication of different bores with different galleries or passages.
4. A hydraulic transmission device as recited in claim 1, wherein said constant-pressure-difference-relief valve spool is provided with a fifth orifice capable of communicating with said second passage.
5. The hydraulic transmission device as recited in claim 1, wherein said port a oil gallery, said port B oil gallery, and said two T oil galleries extend in a radial direction of said main valve chamber, respectively, and said P oil gallery extends in a radial direction of said differential relief valve chamber.
6. A hydraulic transmission device as defined in claim 1, wherein said constant-pressure-differential relief valve chamber comprises:
the first cavity section extends along the axial direction of the valve body and is communicated with the first channel, and the fixed-difference pressure reducing valve core is movably arranged in the first cavity section along the axial direction of the first cavity section;
the damper comprises a first cavity section, a second cavity section, a damper body and a damper, wherein the first cavity section is arranged at one end of the valve body, the damper body is arranged in the first cavity section, the damper body is arranged in the second cavity section, the second cavity section is arranged at the other end of the first cavity section in a manner of extending along the axial direction of the valve body, one end of the second cavity section is communicated with the first cavity section, at least one part of the second cavity section is communicated with the second channel, the damper is arranged in the second cavity section, and the radial dimension of.
7. A hydraulic conduction device as claimed in claim 6, wherein the axes of the first and second chamber sections are not collinear.
8. A hydraulic conduction device as claimed in claim 7, further comprising:
and one end of the fixed-difference pressure-reducing valve core is inwards sunken to form an installation groove, one end of the elastic part is arranged in the installation groove, and the other end of the elastic part is stopped against the end surface of the first cavity section.
9. A hydraulic conduction device as claimed in claim 8, wherein said second passage is provided between said mounting groove and said main spool, said second passage being for leading out pressure of a working port.
10. A working machine, characterized by comprising a hydraulic conduction device as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508201.0U CN209876024U (en) | 2019-04-16 | 2019-04-16 | Hydraulic transmission device and engineering machinery with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508201.0U CN209876024U (en) | 2019-04-16 | 2019-04-16 | Hydraulic transmission device and engineering machinery with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209876024U true CN209876024U (en) | 2019-12-31 |
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ID=68960164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920508201.0U Active CN209876024U (en) | 2019-04-16 | 2019-04-16 | Hydraulic transmission device and engineering machinery with same |
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| Country | Link |
|---|---|
| CN (1) | CN209876024U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095696A (en) * | 2022-08-01 | 2022-09-23 | 太重集团榆次液压工业有限公司 | Large-flow pilot-operated pressure compensation valve |
-
2019
- 2019-04-16 CN CN201920508201.0U patent/CN209876024U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095696A (en) * | 2022-08-01 | 2022-09-23 | 太重集团榆次液压工业有限公司 | Large-flow pilot-operated pressure compensation valve |
| CN115095696B (en) * | 2022-08-01 | 2024-05-24 | 太重集团榆次液压工业有限公司 | High-flow pilot-operated pressure compensation valve |
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