CN114396407A

CN114396407A - Variable control valve structure, variable motor and engineering machinery

Info

Publication number: CN114396407A
Application number: CN202210081424.XA
Authority: CN
Inventors: 李晗; 李新峰; 叶清
Original assignee: HANGZHOU LILONG HYDRAULIC CO LTD
Current assignee: HANGZHOU LILONG HYDRAULIC CO LTD
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-04-26

Abstract

The invention provides a variable control valve structure, a variable motor and engineering machinery, wherein the variable control valve structure comprises a valve sleeve, a valve core and an electric driving piece, wherein the valve sleeve is provided with a first oil port and a second oil port; the valve core is movably arranged in the valve sleeve and comprises a first section and a partition section, the first section is sleeved in the valve sleeve at intervals to form an oil guide cavity, the oil guide cavity is communicated with the first oil port, and the partition section is configured to move along with the valve core to partition or communicate the oil guide cavity and the second oil port; the electric driving piece is connected with the valve core to drive the valve core to move. In the structure, the displacement switching is realized through an electric control mode, the speed is higher, the stability is higher, the oil way structure arrangement can be reduced, the processing cost is reduced, and the defects of high structure cost and low reliability of the variable control valve in the prior art are overcome.

Description

Variable control valve structure, variable motor and engineering machinery

Technical Field

The invention relates to the technical field of hydraulic elements, in particular to a variable control valve structure, a variable motor and engineering machinery.

Background

At present, the main hoisting action of the engineering machinery such as a domestic automobile crane or a crawler crane is the hoisting and the lowering of a heavy object. The lifting speed and the lowering speed are divided into a high speed and a low speed, and the high speed and the low speed are realized by switching the displacement of the motor, so that the structure of the control valve for controlling the displacement switching of the motor is particularly important.

With the demand of the engineering machinery market, the requirements of customers on the cost, the reliability, the stability of high-speed and low-speed switching and the like of the hoisting motor are higher and higher. The variable control valve structure in the prior art usually adopts a hydraulic pilot structure to realize displacement switching, and the structure has high cost and low reliability and is difficult to adapt to the high-pressure and high-speed control requirement.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects of high cost and low reliability of the variable control valve structure in the prior art, so as to provide a variable control valve structure, a variable motor and an engineering machine.

In order to solve the above problems, the present invention provides a variable control valve structure including a valve housing, a valve core, and an electric driving member. The valve sleeve is provided with a first oil port and a second oil port; the valve core is movably arranged in the valve sleeve and comprises a first section and a partition section, the first section is sleeved in the valve sleeve at intervals to form an oil guide cavity, the oil guide cavity is communicated with the first oil port, and the partition section is configured to move along with the valve core to partition or communicate the oil guide cavity and the second oil port; the electric driving piece is connected with the valve core to drive the valve core to move.

Optionally, the variable control valve structure further comprises a reset mechanism, the reset mechanism is arranged at one end of the valve core, which is far away from the electric driving piece, and the reset mechanism is configured to reset the valve core when the electric driving piece is powered off.

Optionally, the return mechanism comprises an abutment and a resilient member. The abutting part abuts against one end, away from the electric driving part, of the valve core; the elastic piece is supported at one end of the abutting piece, which is far away from the valve core, so as to provide resetting force.

Optionally, the electric driving member is configured to drive the valve plug to move from a first position to a second position, the first position lower partition section partitions the oil guide cavity and the second oil port, and the second position lower oil guide cavity is communicated with the second oil port.

Optionally, the spool further comprises a stopper section configured to be movable with the spool into abutment with the end surface of the valve sleeve to retain the spool in the second position.

Optionally, the valve core is provided as a solid structure.

Optionally, the electric drive is provided as a proportional electromagnet.

Optionally, the variable control valve structure further comprises a valve body, and a first oil path and a second oil path are arranged on the valve body; the valve sleeve is arranged in the valve body, the first oil port is communicated with the first oil way, and the second oil port is communicated with the second oil way.

The invention also provides a variable displacement motor which comprises a variable control valve structure and a variable displacement piston. The variable control valve structure is the variable control valve structure, and the first oil port is used for introducing pressure oil in the variable motor; and a rodless cavity of the variable piston is connected with the second oil port.

The invention also provides a construction machine which comprises the variable displacement motor.

The invention has the following advantages:

1. the variable control valve structure is used for a variable motor, when the variable motor is switched from large displacement to small displacement, pressure oil can enter the oil guide cavity from the first oil port, then the valve core is driven by the electric driving part to move, the partition section moves along with the valve core, the first oil port and the second oil port are conducted, the pressure oil flows out from the second oil port, and displacement switching is achieved. Compared with the prior art, the electric control mode is faster and more stable, the arrangement of an oil way structure can be reduced, and the processing cost is reduced.

2. The electric driving piece is set as a proportional electromagnet, and has simple structure, low cost and high reliability.

3. When the electric driving piece is powered off, the valve core can be reset through the resetting mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view showing an overall structure of a variable displacement motor provided by the present invention;

fig. 2 shows an enlarged schematic view of the structure at a in fig. 1.

Description of reference numerals:

10. a valve housing; 11. a first oil port; 12. a second oil port; 13. a limiting groove; 20. a valve core; 21. a first stage; 211. an oil guide cavity; 22. a blocking section; 23. a limiting section; 24. a second stage; 30. an electric drive; 40. a reset mechanism; 41. an abutting member; 42. an elastic member; 50. a valve body; 100. a variable control valve structure.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The present embodiment provides a variable control valve structure, as shown in fig. 1 and 2, including a valve housing 10, a valve core 20, and an electric driver 30. Wherein, the valve housing 10 is provided with a first oil port 11 and a second oil port 12. A valve spool 20 is movably disposed within the valve housing 10, the valve spool 20 including a first section 21 and a blocking section 22: the first section 21 is sleeved in the valve sleeve 10 at intervals to form an oil guide cavity 211, and the oil guide cavity 211 is communicated with the first oil port 11; the blocking section 22 can move along with the valve spool 20 to block the oil guide chamber 211 and the second port 12 or to communicate the oil guide chamber 211 and the second port 12.

The variable control valve structure is used for a variable motor, and when the variable motor has large displacement, the blocking section 22 is arranged to block the oil guide cavity 211 and the second oil port 12, namely the first oil port 11 is not communicated with the second oil port 12; then, when the displacement of the variable displacement motor is switched from the large displacement to the small displacement, the pressure oil can enter the oil guide cavity 211 from the first oil port 11, and then the valve core 20 is driven by the electric driving part 30 to move, so that the partition section 22 moves along with the valve core 20, the communication between the oil guide cavity 211 and the second oil port 12 is realized, that is, the first oil port 11 and the second oil port 12 are communicated, the pressure oil flows out from the second oil port 12, and the displacement switching is realized. On the whole, compared with the mode that the displacement of the variable motor is controlled by using a hydraulic pilot structure to switch, the electric control mode is faster and more stable, the oil way structure can be reduced, the processing cost is reduced, and the high-pressure and high-speed control requirement is better met.

Preferably, the electric driver 30 is configured as a proportional electromagnet, which is simple in structure, low in cost, and highly reliable.

In this embodiment, the electric driver 30 is capable of driving the valve element 20 from the first position to the second position. When the valve core 20 is at the first position, the oil guide cavity 211 and the second oil port 12 can be isolated by the isolating section 22, so that the first oil port 11 and the second oil port 12 are not communicated; when the valve core 20 moves to the second position, the blocking section 22 moves along with the valve core 20, and the oil guide cavity 211 is communicated with the second oil port 12, so that the first oil port 11 and the second oil port 12 can be communicated.

Further, as shown in fig. 2, the valve core 20 further includes a stopper section 23. When the valve core 20 moves, the limiting section 23 can move along with the valve core 20 to abut against the end surface of the valve sleeve 10, so that the valve core 20 is kept at the second position, and the accuracy of executing the action is ensured. As can be seen from fig. 2, the moving end of the electric driver 30 is connected to the stopper section 23, so that the valve element 20 is driven by the stopper section 23 to move integrally.

In this embodiment, the valve housing 10 has a central bore with which both the first port 11 and the second port 12 communicate. The first section 21 and the blocking section 22 are slidably disposed in the central bore of the valve housing 10. Preferably, the first segment 21 and the partition segment 22 are both provided as equal diameter segments. Wherein the radial dimension of the first section 21 is smaller than that of the central hole to form an oil guide chamber 211; the partition section 22 can circumferentially abut against the hole wall of the central hole to perform a partition function.

The spacing segment 23 is arranged to extend through the central bore of the valve sleeve 10 and the radial dimension of the spacing segment 23 is greater than the radial dimension of the central bore. Correspondingly, a limiting groove 13 is formed in the end surface of the valve sleeve 10, which is far away from the second oil port 12, and the limiting section 23 can abut against the bottom wall of the limiting groove 13 to cooperate with the limiting groove 13 to exert a limiting effect. As shown in fig. 2, the valve core 20 further includes a second section 24, and the second section 24 is disposed between the first section 21 and the stopper section 23 and is slidably and sealingly coupled to the central bore of the valve housing 10. Leakage of the pressure oil in the oil guide chamber 211 can be effectively prevented by the second section 24.

As a whole, the valve element 20 in the present embodiment is provided as a solid structure. Compared with the prior art, the pilot oil way structure is omitted, the processing is more convenient, and the cost is reduced. In addition, after the solid structure is adopted, the strength of the valve core 20 is enhanced, so that the service life can be prolonged.

Next, other structures of the variable control valve structure will be described.

As shown in fig. 2, the variable control valve structure further includes a reset mechanism 40, the reset mechanism 40 is disposed at an end of the valve core 20 away from the electric driver 30, and the reset mechanism 40 is configured to reset the valve core 20 from the second position to the first position when the electric driver 30 is de-energized.

Optionally, the return mechanism 40 comprises an abutment 41 and an elastic member 42. The abutting member 41 abuts against one end of the valve core 20 away from the electric driving member 30, and the elastic member 42 is supported by one end of the abutting member 41 away from the valve core 20. When the electric driving element 30 is powered to drive the valve core 20 to move, the valve core 20 is abutted against the abutting element 41, and the elastic element 42 is compressed; when the electric driver 30 is de-energized, the elastic member 42 will rebound, so as to provide a restoring force to the valve core 20 through the abutting member 41, thereby restoring the valve core 20.

In this embodiment, the end of the valve core 20 facing away from the electric driver 30 is disposed to extend out of the valve housing 10. The abutment member 41 is provided as a spring seat, and the large end thereof abuts against the valve element 20; the elastic member 42 is correspondingly configured as a spring, which is sleeved on the spring seat, and the whole structure is stable and reliable.

As shown in fig. 1, the variable control valve structure further includes a valve body 50. The valve body 50 is provided with a first oil passage and a second oil passage. The valve housing 10 is installed in the valve body 50, the first oil port 11 is communicated with the first oil path, and the second oil port 12 is communicated with the second oil path.

The present embodiment also provides a variable displacement motor including a variable displacement control valve structure 100 and a variable displacement piston, where the variable displacement control valve structure 100 is the variable displacement control valve structure as described above.

In this embodiment, the first port 11 is used for introducing pressure oil in the variable displacement motor, and the rodless chamber of the variable displacement piston is connected to the second port 12. Therefore, pressure oil can enter from the first oil port 11, and when the first oil port 11 is communicated with the second oil port 12, the pressure oil is introduced into a rodless cavity of the variable piston, so that displacement switching is realized.

More specifically, when the outlet pressure of the variable motor is higher than the set pressure, the valve element 20 is driven by the electric driver 30 to move to the second position, so that the first oil port 11 and the second oil port 12 are communicated, and the pressure oil is controlled to enter the rodless cavity of the variable piston, so that the piston rod of the variable piston stretches, the oblique shaft angle of the variable motor is reduced, and the displacement is reduced; when the outlet pressure of the variable displacement motor is reduced to the set pressure, the electric driving element 30 is controlled to be powered off, and the valve core 20 can be reset through the resetting mechanism 40, so that the communication between the first oil port 11 and the second oil port 12 is cut off.

It will be further understood that, for the valve body 50 of the variable control valve, the first oil passage thereof is used for connecting pressure oil in the hydraulic motor to supply the pressure oil to the first oil port 11, and the second oil passage is communicated with the rodless chamber of the variable piston.

The embodiment also provides a working machine which comprises the variable displacement motor. It will be appreciated by those skilled in the art that the work machine may be a truck crane, a crawler crane, or other similar machine.

According to the above description, the present application has the following advantages:

1. the valve core 20 of the variable control valve structure is driven to move in an electric control mode, so that the displacement switching is faster and more stable, and the reliability is higher;

2. simple structure and low processing cost.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A variable control valve structure, comprising:

the valve sleeve (10), wherein a first oil port (11) and a second oil port (12) are formed in the valve sleeve (10);

the valve core (20) is movably arranged in the valve sleeve (10), the valve core (20) comprises a first section (21) and a partition section (22), the first section (21) is sleeved in the valve sleeve (10) at intervals to form an oil guide cavity (211), the oil guide cavity (211) is communicated with the first oil port (11), and the partition section (22) is configured to move along with the valve core (20) to partition or communicate the oil guide cavity (211) and the second oil port (12);

and the electric driving piece (30) is connected with the valve core (20) to drive the valve core (20) to move.

2. A variable control valve arrangement according to claim 1, further comprising a reset mechanism (40), the reset mechanism (40) being arranged at an end of the spool (20) facing away from the electric drive (30), the reset mechanism (40) being configured to reset the spool (20) when the electric drive (30) is de-energized.

3. A variable control valve structure according to claim 2, characterized in that the return mechanism (40) comprises:

an abutting piece (41) abutting against one end, away from the electric driving piece (30), of the valve core (20);

and the elastic piece (42) is supported at one end of the abutting piece (41) departing from the valve core (20) to provide a resetting force.

4. The variable control valve structure according to claim 1, wherein the electric driver (30) is configured to drive the spool (20) to move from a first position in which the blocking section (22) blocks the oil guide chamber (211) and the second oil port (12) to a second position in which the oil guide chamber (211) and the second oil port (12) are communicated.

5. A variable control valve arrangement according to claim 4, wherein the spool (20) further comprises a land (23), the land (23) being configured to be movable with the spool (20) into abutment with an end face of the valve sleeve (10) to retain the spool (20) in the second position.

6. A variable control valve structure according to claim 1, characterized in that the spool (20) is provided as a solid structure.

7. A variable control valve arrangement according to claim 1, characterized in that the electric drive (30) is arranged as a proportional electromagnet.

8. The variable control valve structure according to claim 1, characterized by further comprising a valve body (50), the valve body (50) being provided with a first oil passage and a second oil passage;

the valve sleeve (10) is installed in the valve body (50), the first oil port (11) is communicated with the first oil way, and the second oil port (12) is communicated with the second oil way.

9. A variable displacement motor, comprising:

a variable control valve structure (100), the variable control valve structure (100) being as claimed in any one of claims 1 to 8, the first oil port (11) being for pressure oil introduced into the variable motor;

and a rodless cavity of the variable piston is connected with the second oil port (12).

10. A working machine, characterized by comprising a variable displacement motor according to claim 9.