Feedback oil circuit for multiple clutches, control valve and control method thereof

Abstract

The present invention discloses a feedback oil circuit for multiple clutches, a control valve and a control method thereof, comprising a valve body, a first transverse oil chamber, a first longitudinal oil chamber and an oil outlet are provided on the valve body, the first transverse oil chamber is connected to the first longitudinal oil chamber through a first oil hole, a first oil inlet screw plug is provided at the other end of the first transverse oil chamber, a first valve core and a first compression spring are provided in the first transverse oil chamber, and a second valve core and a second compression spring are provided in the first longitudinal oil chamber, a spring mounting groove is provided at one end of the first valve core, a second oil hole is provided on the groove wall of the spring mounting groove, an oil guide hole is provided at the other end of the first valve core, and the second valve core has the same structure as the first valve core. In this scheme, the functions required for the control valve for the feedback oil circuit are integrated into an integrated design, which is fast and reliable. At the same time, a compression spring is provided at one end of the valve core. When multiple clutches are used in combination, the oil pressure at both ends of the valve core is equal, eliminating the safety risk of the oil outlet being blocked and the feedback oil circuit being cut off.

Description

Technical Field

[0001] The invention relates to the field of hydraulic control systems, and in particular to a feedback oil circuit for multiple clutches, a control valve and a control method thereof. Background Art

[0002] In order to be able to carry out offshore engineering operations such as supply operations, rescue operations, anchor handling operations, towing operations, guarding operations, firefighting operations, and oil recovery operations under harsh environmental conditions, ships usually need to have good speed, seakeeping and operability, especially good seaworthiness and operational capabilities in harsh weather conditions, and meet the special stability requirements for various special operations, especially the stability requirements for mixed operations and compound operations.

[0003] Some marine main propulsion gearboxes are equipped with two PTO outputs, one main clutch plus two PTO clutches, and some marine main propulsion gearboxes are even equipped with four or five clutches. Multiple sets of hydraulic wet friction clutches control the output of each function respectively. These clutches have their own independent use conditions, any two sets of clutches can be used in combination, and multiple sets of clutches can be used at the same time. In order to achieve the smooth engagement of the three sets of clutches, the working oil pressure needs to have a pressure increase process, which is usually achieved by connecting the feedback oil circuits of the clutches to the secondary control valve. The patent application with the publication number CN101900198A discloses a marine gearbox integrated valve, which can be installed with two pneumatic control valves at the same time. However, the valve can only be used for one clutch connection and cannot meet the working conditions of any two sets of clutches or multiple sets of clutches in combination. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, one of the objects of the present invention is to provide a feedback oil circuit control valve for multiple clutches, which can realize various combination working conditions of multiple clutches, and has the advantages of being fast and reliable, compact structure, simple installation and maintenance, and high integration of the control system. The second object of the present invention is to provide a feedback oil circuit for multiple clutches using the above-mentioned control valve. The third object of the present invention is to provide a control method for a feedback oil circuit control valve for multiple clutches.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A feedback oil circuit control valve for multiple clutches comprises a valve body, wherein the valve body is provided with a first transverse oil chamber, a first longitudinal oil chamber and an oil outlet, wherein a first oil-passing ring groove is provided in the first transverse oil chamber, and a second oil-passing ring groove is provided in the first longitudinal oil chamber, wherein one end of the first transverse oil chamber is connected with the first longitudinal oil chamber through a first oil hole and a second oil-passing ring groove, wherein a first oil inlet screw plug is provided at the other end of the first transverse oil chamber, and a second oil inlet screw plug and a third oil inlet screw plug are provided at both ends of the first longitudinal oil chamber respectively; and further comprising a first valve core and a first compression spring arranged in the first transverse oil chamber, and a second valve core and a second compression spring arranged in the first longitudinal oil chamber, A spring mounting groove is provided at one end of the first valve core, a second oil hole is opened on the groove wall of the spring mounting groove, an oil guide hole is opened at the other end of the first valve core, and the second valve core has the same structure as the first valve core; the opening of the spring mounting groove of the first valve core faces the first oil inlet plug, one end of the first compression spring abuts against the first oil inlet plug, the other end of the first compression spring abuts in the spring mounting groove of the first valve core, and the oil outlet is connected with the first oil ring groove; the opening of the spring mounting groove of the second valve core faces the second oil inlet plug, one end of the second compression spring abuts against the second oil inlet plug, and the other end of the second compression spring abuts in the spring mounting groove of the second valve core.

[0007] Preferably, a first gasket is provided between the first oil inlet screw plug and the valve body; a second gasket is provided between the second oil inlet screw plug and the valve body; and a third gasket is provided between the third oil inlet screw plug and the valve body.

[0008] Preferably, the central axes of the first oil inlet plug, the oil guide hole of the first valve core and the first oil hole are coaxial; the central axes of the second oil inlet plug, the third oil inlet plug and the oil guide hole of the second valve core are coaxial.

[0009] Preferably, a second longitudinal oil chamber is provided on the valve body, a third oil ring groove is opened in the second longitudinal oil chamber, the oil outlet is communicated with the third oil ring groove, the lower end of the second longitudinal oil chamber is communicated with the first transverse oil chamber through the third oil hole and the first oil ring groove, a fourth oil inlet plug is provided at the upper end of the second longitudinal oil chamber, and a fourth gasket is provided between the fourth oil inlet plug and the valve body; a third valve core and a third compression spring are provided in the second longitudinal oil chamber, the third valve core has the same structure as the first valve core, the opening of the spring mounting groove of the third valve core faces the fourth oil inlet plug, one end of the third compression spring abuts against the fourth oil inlet plug, and the other end of the third compression spring abuts against the spring mounting groove of the third valve core.

[0010] Preferably, central axes of the fourth oil inlet screw plug, the third oil hole and the oil guide hole of the third valve core are coaxial.

[0011] Preferably, a second transverse oil chamber is provided on the valve body, a fourth oil ring groove is opened in the second transverse oil chamber, the oil outlet is connected with the fourth oil ring groove, one end of the second transverse oil chamber is connected with the second longitudinal oil chamber through a fourth oil hole and the third oil ring groove, a fifth oil inlet plug is provided at the other end of the second transverse oil chamber, and a fifth gasket is provided between the fifth oil inlet plug and the valve body; a fourth valve core and a fourth compression spring are provided in the second transverse oil chamber, the fourth valve core has the same structure as the first valve core, the opening of the spring mounting groove of the fourth valve core faces the fifth oil inlet plug, one end of the fourth compression spring abuts against the fifth oil inlet plug, and the other end of the fourth compression spring abuts against the spring mounting groove of the fourth valve core.

[0012] Preferably, central axes of the fifth oil inlet screw plug, the fourth oil hole and the oil guide hole of the fourth valve core are coaxial.

[0013] A feedback oil circuit for multiple clutches includes a feedback oil circuit control valve for multiple clutches as described above, and also includes clutch I, clutch II, clutch III, control valve I, control valve II, control valve III, an oil pump and a secondary control valve, wherein the oil pump is connected to the secondary control valve, and control valves I, II and III are connected in parallel between the oil pump and the secondary control valve, the control valve I is respectively connected to the clutch I and the first oil inlet screw plug of the feedback oil circuit control valve, the control valve II is respectively connected to the clutch II and the second oil inlet screw plug of the feedback oil circuit control valve, the control valve III is respectively connected to the clutch III and the third oil inlet screw plug of the feedback oil circuit control valve, and the oil outlet of the feedback oil circuit control valve is connected to the secondary control valve.

[0014] A control method for a feedback oil circuit for multiple clutches as described above,

[0015] 1. Single clutch independent working control method:

[0016] 1.1 Clutch I working:

[0017] The control valve I moves to the closing and discharging position, and the oil pump starts to fill the oil cylinder of the clutch I. At the same time, the working oil flows from the first oil inlet screw plug into the left side of the first transverse oil chamber, and the working oil is fed back to the secondary control valve through the second oil hole on the first valve core, the first oil ring groove and the oil outlet;

[0018] 1.2 Clutch II working:

[0019] The control valve II moves to the closing and discharging position, and the oil pump starts to fill the oil cylinder of the clutch II. At the same time, the working oil flows from the second oil inlet screw plug into the lower side of the first longitudinal oil chamber, and the working oil flows to the oil guide hole of the first valve core through the second oil hole, the second oil ring groove and the first oil hole on the second valve core. Under the action of the working oil pressure, the first compression spring is compressed, the first valve core moves to the left end, the right side of the first transverse oil chamber is connected to the oil outlet, and the working oil is fed back to the secondary control valve through the first oil ring groove and the oil outlet;

[0020] 1.3 Clutch III working:

[0021] The control valve III moves to the closing and discharging position, and the oil pump starts to fill the clutch III oil cylinder with oil. At the same time, the working oil flows from the third oil inlet screw plug into the upper side of the first longitudinal oil chamber, and the second valve core is pushed downward under the action of the oil pressure. The second compression spring is compressed, and the second valve core moves to the lower end position. The upper side of the first longitudinal oil chamber is connected to the right side of the first transverse oil chamber. Under the action of the working oil pressure, the first compression spring is compressed, and the first valve core moves to the left end. The right side of the first transverse oil chamber is connected to the oil outlet, and the working oil is fed back to the secondary control valve through the first oil ring groove and the oil outlet;

[0022] 2. Any two sets of clutches work in combination

[0023] 2.1 Clutch I and clutch II work simultaneously:

[0024] When clutch I is engaged first, the process is the same as the clutch I engagement process in method 1.1; when clutch II is engaged again, the working oil is introduced into the lower side of the first longitudinal oil chamber, the lower side of the first longitudinal oil chamber is connected to the right side of the first transverse oil chamber, the oil pressure on the left and right sides of the first valve core is equal, and under the action of the first compression spring, the position of the first valve core remains unchanged, the feedback oil pressure P2 at the second oil inlet screw plug is cut off, and the feedback oil pressure P1 at the first oil inlet screw plug is the feedback oil pressure of clutch I and clutch II;

[0025] 2.2 Clutch I and clutch III work simultaneously:

[0026] When clutch I is engaged first, the process is the same as the engagement process of clutch I in method 1.1; when clutch III is engaged again, the working oil is introduced into the upper side of the first longitudinal oil chamber, the second compression spring is compressed under the action of oil pressure, the second valve core moves to the lower end position, the upper side of the first longitudinal oil chamber is connected to the right side of the first transverse oil chamber, the oil pressure on the left and right sides of the first valve core is equal, and under the action of the first compression spring, the position of the first valve core remains unchanged, the feedback oil pressure P3 at the third oil inlet screw plug is cut off, and the feedback oil pressure P1 at the first oil inlet screw plug is the feedback oil pressure of clutch I and clutch III;

[0027] 2.3 Clutch II and clutch III work simultaneously:

[0028] When clutch II is engaged first, the process is the same as the clutch II engagement process in method 1.2; when clutch III is engaged again, the working oil is introduced into the upper side of the first longitudinal oil chamber, the oil pressures on the upper and lower sides of the second valve core are equal, and under the action of the second compression spring, the position of the second valve core remains unchanged, and the feedback oil pressure P3 at the third oil inlet screw plug is cut off; the feedback oil pressure P2 at the second oil inlet screw plug is the feedback oil pressure of clutch II and clutch III;

[0029] 3. Clutch I, clutch II and clutch III work in combination:

[0030] When clutch I engages first, the process is the same as the engagement process of clutch I in method 1.1; when clutch II engages again, the working oil is introduced into the lower side of the first longitudinal oil chamber, the lower side of the first longitudinal oil chamber is connected to the right side of the first transverse oil chamber, the oil pressure on the left and right sides of the first valve core is equal, and under the action of the first compression spring, the position of the first valve core remains unchanged, and the feedback oil pressure P2 at the second oil inlet plug is cut off; when clutch III engages last, the working oil is introduced into the upper side of the first longitudinal oil chamber, the oil pressure on the upper and lower sides of the second valve core is equal, and under the action of the second compression spring, the position of the second valve core remains unchanged, and the feedback oil pressure P3 at the third oil inlet plug is cut off; the feedback oil pressure P1 at the first oil inlet plug is the feedback oil pressure of clutch I, clutch II and clutch III.

[0031] Due to the adoption of the above technical scheme, the present invention has the following beneficial effects: the present invention integrates the functions required for the control valve for the feedback oil circuit into an integrated design, which has the advantages of being fast and reliable. At the same time, a compression spring is provided at one end of the valve core. When multiple sets of clutches are used in combination, the oil pressure at both ends of the valve core is equal. Under the action of the compression spring, the valve core is in its original position, eliminating the hidden danger of uncertainty in the position of the valve core when the oil pressure is equal, that is, eliminating the safety risk of the oil outlet being blocked and the feedback oil circuit being cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a hydraulic principle diagram of Example 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of Example 1 of the present invention;

[0034] Figure 3 This is a schematic structural diagram of a valve body according to Example 1 of the present invention;

[0035] Figure 4 It is a structural schematic diagram of the valve core in the present invention;

[0036] Figure 5 This is a working schematic diagram I of Example 1 of the present invention;

[0037] Figure 6This is a working schematic diagram II of Example 1 of the present invention;

[0038] Figure 7 This is a working schematic diagram III of Example 1 of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of Example 2 of the present invention;

[0040] Fig. 9 It is a schematic diagram of the structure of Example 3 of the present invention.

[0041] Reference numerals:

[0042] 100. Feedback oil circuit control valve; 1. Valve body; 2. First valve core; 3. First compression spring; 4. Second valve core; 5. Second compression spring; 6. First oil inlet plug; 7. Second oil inlet plug; 8. Third oil inlet plug; 9. First gasket; 10. Second gasket; 11. Third gasket; 12. Fourth oil inlet plug; 13. Fourth gasket; 14. Third valve core; 15. Third compression spring; 16. Fifth oil inlet plug; 17. Fourth valve core; 18. Fourth compression spring; 19. Clutch I; 20. Clutch II; 21. Clutch III; 22. Control valve I; 23. Control valve II; 24. Control valve III; 25. Oil pump; 26. Secondary control valve; 27. Fifth gasket;

[0043] a, first transverse oil chamber; b, first longitudinal oil chamber; c, first oil hole; d, first oil ring groove; e, second oil ring groove; f, spring mounting groove; g, second oil hole; h, second longitudinal oil chamber; i, third oil hole; j, third oil ring groove; k, second transverse oil chamber; m, fourth oil ring groove; n, fourth oil hole; o, oil guide hole;

[0044] A. Oil outlet. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0050] like Figures 2 to 7A feedback oil circuit control valve for multiple clutches is shown. In this embodiment, the feedback oil circuit control valve for multiple clutches is a feedback oil circuit control valve for three clutches, including a valve body 1, on which a first transverse oil chamber a, a first longitudinal oil chamber b and an oil outlet A are provided. A first oil ring groove d is provided in the first transverse oil chamber a, and a second oil ring groove e is provided in the first longitudinal oil chamber b. One end of the first transverse oil chamber a is connected to the first longitudinal oil chamber b through a first oil hole c and a second oil ring groove e. A first oil inlet screw plug 6 is provided at the other end of the first transverse oil chamber a, and a second oil inlet screw plug 7 and a third oil inlet screw plug 8 are provided at both ends of the first longitudinal oil chamber b, respectively; and the valve body 1 also includes a first valve core 2 and a first compression spring 3 arranged in the first transverse oil chamber a, and a first compression spring 3 and a third compression spring 3 arranged in the first longitudinal oil chamber b. The second valve core 4 and the second compression spring 5 in the oil chamber b, one end of the first valve core 2 is provided with a spring mounting groove f, the groove wall of the spring mounting groove f is provided with a second oil hole g, the other end of the first valve core 2 is provided with an oil guide hole o, the second valve core 4 has the same structure as the first valve core 2; the opening of the spring mounting groove f of the first valve core 2 faces the first oil inlet plug 6, one end of the first compression spring 3 abuts against the first oil inlet plug 6, the other end of the first compression spring 3 abuts against the spring mounting groove f of the first valve core 2, and the oil outlet A is connected with the first oil ring groove d; the opening of the spring mounting groove f of the second valve core 4 faces the second oil inlet plug 7, one end of the second compression spring 5 abuts against the second oil inlet plug 7, and the other end of the second compression spring 5 abuts against the spring mounting groove f of the second valve core 4.

[0051] A first gasket 9 is provided between the first oil inlet screw plug 6 and the valve body 1; a second gasket 10 is provided between the second oil inlet screw plug 7 and the valve body 1; and a third gasket 11 is provided between the third oil inlet screw plug 8 and the valve body 1. In the present invention, the first gasket 9, the second gasket 10 and the third gasket 11 are copper gaskets.

[0052] The central axes of the first oil inlet screw plug 6, the oil guide hole o of the first valve core 2 and the first oil hole c are coaxial; the central axes of the second oil inlet screw plug 7, the third oil inlet screw plug 8 and the oil guide hole o of the second valve core 4 are coaxial.

[0053] The present invention also discloses Figure 1A feedback oil circuit for multiple clutches shown in the figure includes a feedback oil circuit control valve for multiple clutches as described above, and also includes clutch I19, clutch II20, clutch III21, control valve I22, control valve II23, control valve III24, oil pump 25 and secondary control valve 26, wherein the oil pump 25 is connected to the secondary control valve 26, and control valves I22, II23 and III24 are connected in parallel between the oil pump 25 and the secondary control valve 26, wherein the control valve I22 is respectively connected to the clutch I19 and the first oil inlet plug 6 of the feedback oil circuit control valve 100, the control valve II23 is respectively connected to the clutch II20 and the second oil inlet plug 7 of the feedback oil circuit control valve 100, the control valve III24 is respectively connected to the clutch III21 and the third oil inlet plug 8 of the feedback oil circuit control valve 100, and the oil outlet A of the feedback oil circuit control valve 100 is connected to the secondary control valve 26.

[0054] The present invention also discloses a control method for a feedback oil circuit for multiple clutches, which is specifically as follows:

[0055] 1. Single clutch independent working control method:

[0056] 1.1 Clutch I19 working:

[0057] like Figure 2 As shown, the control valve I22 moves to the closing and discharging position, and the oil pump 25 starts to fill the oil cylinder of the clutch I19. At the same time, the working oil flows from the first oil inlet screw plug 6 to the left side of the first transverse oil chamber a. The working oil is fed back to the secondary control valve 26 through the second oil hole g, the first oil ring groove d and the oil outlet A on the first valve core 2, realizing the function of increasing the working oil pressure, thereby realizing the smooth engagement of the clutch I19.

[0058] 1.2 Clutch II20 working:

[0059] like Figure 2 and Figure 5 As shown, the control valve II23 moves to the closing position, and the oil pump 25 starts to fill the oil cylinder of the clutch II20. At the same time, the working oil flows from the second oil inlet plug 7 into the lower side of the first longitudinal oil chamber b, and the working oil flows through the second oil hole g, the second oil ring groove e and the first oil hole c on the second valve core 4 to the oil guide hole o of the first valve core 2. Under the action of the working oil pressure, the first compression spring 3 is compressed, and the first valve core 2 moves to the left end. The right side of the first transverse oil chamber a is connected to the oil outlet A, and the working oil is fed back to the secondary control valve 26 through the first oil ring groove d and the oil outlet A, realizing the working oil pressure increasing function, thereby realizing the smooth engagement of the clutch II20.

[0060] 1.3 Clutch III21 working:

[0061] like Figure 2 and Figure 6 As shown, the control valve III24 moves to the closing position, the oil pump 25 starts to fill the clutch III21 oil cylinder with oil, and at the same time, the working oil flows from the third oil inlet screw plug 8 into the upper side of the first longitudinal oil chamber b, and the second valve core 4 is pushed downward by the oil pressure, the second compression spring 5 is compressed, the second valve core 4 moves to the lower end position, the upper side of the first longitudinal oil chamber b is connected to the right side of the first transverse oil chamber a, and the first compression spring 3 is compressed under the action of the working oil pressure, the first valve core 2 moves to the left end, the right side of the first transverse oil chamber a is connected to the oil outlet A, and the working oil is fed back to the secondary control valve 26 through the first oil ring groove d and the oil outlet A, realizing the working oil pressure increasing function, thereby realizing the smooth engagement of the clutch III21;

[0062] 2. Any two sets of clutches work in combination

[0063] 2.1 Clutch I19 and clutch II20 work simultaneously:

[0064] like Figure 2 As shown, when the clutch I19 is first engaged, the process is the same as the engagement process of the clutch I19 in method 1.1; when the clutch II20 is engaged again, the working oil is introduced into the lower side of the first longitudinal oil chamber b, and the lower side of the first longitudinal oil chamber b is connected to the right side of the first transverse oil chamber a, and the oil pressures on the left and right sides of the first valve core 2 are equal. Under the action of the first compression spring 3, the position of the first valve core 2 remains unchanged, and the feedback oil pressure P2 at the second oil inlet screw plug 7 is cut off. The feedback oil pressure P1 at the first oil inlet screw plug 6 is the feedback oil pressure of the clutch I19 and the clutch II20;

[0065] 2.2 Clutch I19 and clutch III21 work simultaneously:

[0066] like Figure 2 and Figure 7 As shown, when the clutch I19 is first engaged, the process is the same as the engagement process of the clutch I19 in method 1.1; when the clutch III21 is engaged again, the working oil is introduced into the upper side of the first longitudinal oil chamber b, and the second compression spring 5 is compressed under the action of the oil pressure, and the second valve core 4 moves to the lower end position, and the upper side of the first longitudinal oil chamber b is connected to the right side of the first transverse oil chamber a, and the oil pressures on the left and right sides of the first valve core 2 are equal. Under the action of the first compression spring 3, the position of the first valve core 2 remains unchanged, and the feedback oil pressure P3 at the third oil inlet screw plug 8 is cut off. The feedback oil pressure P1 at the first oil inlet screw plug 6 is the feedback oil pressure of the clutch I19 and the clutch III21;

[0067] 2.3 Clutch II20 and clutch III21 work simultaneously:

[0068] like Figure 2 and Figure 5As shown, the process when clutch II20 is first engaged is the same as the engagement process of clutch II20 in method 1.2; when clutch III21 is engaged again, the working oil is introduced into the upper side of the first longitudinal oil chamber b, and the oil pressures on the upper and lower sides of the second valve core 4 are equal. Under the action of the second compression spring 5, the position of the second valve core 4 remains unchanged, and the feedback oil pressure P3 at the third oil inlet screw plug 8 is cut off; the feedback oil pressure P2 at the second oil inlet screw plug 7 is the feedback oil pressure of clutch II20 and clutch III21;

[0069] 3. Clutch I19, clutch II20 and clutch III21 work in combination:

[0070] like Figure 2 As shown, when clutch I19 is engaged first, the process is the same as the engagement process of clutch I19 in method 1.1; when clutch II20 is engaged again, the working oil is introduced into the lower side of the first longitudinal oil chamber b, and the lower side of the first longitudinal oil chamber b is connected to the right side of the first transverse oil chamber a, and the oil pressures on the left and right sides of the first valve core 2 are equal. Under the action of the first compression spring 3, the position of the first valve core 2 remains unchanged, and the feedback oil pressure P2 at the second oil inlet plug 7 is cut off; when clutch III21 is finally engaged, the working oil is introduced into the upper side of the first longitudinal oil chamber b, and the oil pressures on the upper and lower sides of the second valve core 4 are equal. Under the action of the second compression spring 5, the position of the second valve core 4 remains unchanged, and the feedback oil pressure P3 at the third oil inlet plug 8 is cut off; the feedback oil pressure P1 at the first oil inlet plug 6 is the feedback oil pressure of clutch I19, clutch II20 and clutch III21.

[0071] Through the above control method, the present invention can realize the independent use of three sets of clutches, and realize the pressure increasing function through the secondary control valve 26, so as to realize the smooth engagement of each clutch; the present invention can also realize the combined use of any two sets of clutches in the three sets of clutches, and realize the pressure increasing function of the first set of engaged clutches through the secondary control valve 26, and make the oil pressure of the second set of engaged clutches the same; the present invention can also realize the combined use of three sets of clutches, and realize the pressure increasing function of the first set of engaged clutches through the secondary control valve 26, and make the oil pressure of the subsequent engaged clutches the same; in this way, the feedback oil circuit slowly increases the oil pressure to avoid the clutch being damaged by the impact of the instantaneous oil circuit. The present invention has an integrated design, a compact structure, reduces transition parts, reduces external pipeline connections, makes the control system faster and more reliable, and has a neater and more beautiful appearance. Example

[0072] like Figure 8As shown, this embodiment is a feedback oil circuit control valve for 4 sets of clutches. On the basis of embodiment 1, a second longitudinal oil chamber h is provided on the valve body 1, and a third oil ring groove j is opened in the second longitudinal oil chamber h. In this embodiment, the oil outlet A is not communicated with the first oil ring groove d, but is communicated with the third oil ring groove j. The lower end of the second longitudinal oil chamber h is communicated with the first transverse oil chamber a through the third oil hole i and the first oil ring groove d. A fourth oil inlet screw plug 12 is provided at the upper end of the second longitudinal oil chamber h, and a fourth gasket 13 is provided between the fourth oil inlet screw plug 12 and the valve body 1; a third valve core 14 and a third compression spring 15 are provided in the second longitudinal oil chamber h. The third valve core 14 has the same structure as the first valve core 2. The opening of the spring installation groove f of the third valve core 14 faces the fourth oil inlet screw plug 12. One end of the third compression spring 15 abuts against the fourth oil inlet screw plug 12, and the other end of the third compression spring 15 abuts against the spring installation groove f of the third valve core 14. Central axes of the fourth oil inlet screw plug 12 , the third oil hole i and the oil guide hole o of the third valve core 14 are coaxial. Example

[0073] like Fig. 9 As shown, this embodiment is a feedback oil circuit control valve for 5 sets of clutches. On the basis of embodiment 2, a second transverse oil chamber k is provided on the valve body 1, and a fourth oil ring groove m is opened in the second transverse oil chamber k. In this embodiment, the oil outlet A is not communicated with the third oil ring groove j, but is communicated with the fourth oil ring groove m. One end of the second transverse oil chamber k is communicated with the second longitudinal oil chamber h through the fourth oil hole n and the third oil ring groove j. A fifth oil inlet screw plug 16 is provided at the other end of the second transverse oil chamber k, and a fifth gasket 27 is provided between the fifth oil inlet screw plug 16 and the valve body 1; a fourth valve core 17 and a fourth compression spring 18 are provided in the second transverse oil chamber k. The fourth valve core 17 has the same structure as the first valve core 2. The opening of the spring installation groove f of the fourth valve core 17 faces the fifth oil inlet screw plug 16. One end of the fourth compression spring 18 abuts against the fifth oil inlet screw plug 16, and the other end of the fourth compression spring 18 abuts against the spring installation groove f of the fourth valve core 17.

[0074] All features described in the description, the attached claims and the drawings are essential features for the invention both individually and in any combination.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an implementation", "specific implementation", "other implementations", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment, implementation or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above may also be combined in a suitable manner in any one or more embodiments, implementations or examples. The technical solutions recorded in the present invention also include technical solutions formed by any one or more of the specific features, structures, materials or characteristics described above in a separate or combined manner.

[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A feedback oil circuit control valve for multiple clutches, comprising a valve body (1), characterized in that: The valve body (1) is provided with a first transverse oil chamber (a), a first longitudinal oil chamber (b) and an oil outlet (A); a first oil ring groove (d) is provided in the first transverse oil chamber (a); a second oil ring groove (e) is provided in the first longitudinal oil chamber (b); one end of the first transverse oil chamber (a) is connected to the first longitudinal oil chamber (b) through a first oil hole (c) and the second oil ring groove (e); a first oil inlet screw plug (6) is provided at the other end of the first transverse oil chamber (a); a second oil inlet screw plug (7) and a third oil inlet screw plug (8) are provided at both ends of the first longitudinal oil chamber (b); and the valve body also includes a first valve core (2) and a first compression spring (3) arranged in the first transverse oil chamber (a); and a second valve core (4) and a second compression spring (5) arranged in the first longitudinal oil chamber (b); a spring mounting groove (f) is provided at one end of the first valve core (2); a second oil hole (g) is provided on the groove wall of the spring mounting groove (f); and an oil guide hole is provided at the other end of the first valve core (2). (o), the second valve core (4) has the same structure as the first valve core (2); the opening of the spring installation groove (f) of the first valve core (2) faces the first oil inlet screw plug (6), one end of the first compression spring (3) abuts against the first oil inlet screw plug (6), the other end of the first compression spring (3) abuts against the spring installation groove (f) of the first valve core (2), and the oil outlet (A) is connected to the first oil ring groove (d); the opening of the spring installation groove (f) of the second valve core (4) faces the second oil inlet screw plug (6), and the oil outlet (A) is connected to the first oil ring groove (d). The oil inlet screw plug (7) is provided with one end of the second compression spring (5) butting against the second oil inlet screw plug (7), and the other end of the second compression spring (5) butting against the spring mounting groove (f) of the second valve core (4); the central axes of the first oil inlet screw plug (6), the oil guide hole (o) of the first valve core (2) and the first oil hole (c) are coaxial; the central axes of the second oil inlet screw plug (7), the third oil inlet screw plug (8) and the oil guide hole (o) of the second valve core (4) are coaxial.

2. A feedback oil circuit control valve for multiple clutches according to claim 1, characterized in that: A first gasket (9) is provided between the first oil inlet screw plug (6) and the valve body (1); a second gasket (10) is provided between the second oil inlet screw plug (7) and the valve body (1); and a third gasket (11) is provided between the third oil inlet screw plug (8) and the valve body (1).

3. A feedback oil circuit control valve for multiple clutches according to claim 1 or 2, characterized in that: The valve body (1) is provided with a second longitudinal oil chamber (h), a third oil ring groove (j) is formed in the second longitudinal oil chamber (h), the oil outlet (A) is connected to the third oil ring groove (j), the lower end of the second longitudinal oil chamber (h) is connected to the first transverse oil chamber (a) through a third oil hole (i) and the first oil ring groove (d), the upper end of the second longitudinal oil chamber (h) is provided with a fourth oil inlet screw plug (12), and a fourth gasket (12) is provided between the fourth oil inlet screw plug (12) and the valve body (1). 13); a third valve core (14) and a third compression spring (15) are provided in the second longitudinal oil chamber (h); the third valve core (14) has the same structure as the first valve core (2); the opening of the spring mounting groove (f) of the third valve core (14) faces the fourth oil inlet screw plug (12); one end of the third compression spring (15) abuts against the fourth oil inlet screw plug (12); and the other end of the third compression spring (15) abuts against the spring mounting groove (f) of the third valve core (14).

4. A feedback oil circuit control valve for multiple clutches according to claim 3, characterized in that: The central axes of the fourth oil inlet screw plug (12), the third oil hole (i) and the oil guide hole (o) of the third valve core (14) are coaxial.

5. A feedback oil circuit control valve for multiple clutches according to claim 3, characterized in that: The valve body (1) is provided with a second transverse oil chamber (k), a fourth oil ring groove (m) is formed in the second transverse oil chamber (k), the oil outlet (A) is connected to the fourth oil ring groove (m), one end of the second transverse oil chamber (k) is connected to the second longitudinal oil chamber (h) via a fourth oil hole (n) and a third oil ring groove (j), a fifth oil inlet screw plug (16) is provided at the other end of the second transverse oil chamber (k), and a fifth gasket is provided between the fifth oil inlet screw plug (16) and the valve body (1). (27); A fourth valve core (17) and a fourth compression spring (18) are provided in the second transverse oil chamber (k); the fourth valve core (17) has the same structure as the first valve core (2); the opening of the spring mounting groove (f) of the fourth valve core (17) faces the fifth oil inlet screw plug (16); one end of the fourth compression spring (18) abuts against the fifth oil inlet screw plug (16); and the other end of the fourth compression spring (18) abuts against the spring mounting groove (f) of the fourth valve core (17).

6. A feedback oil circuit control valve for multiple clutches according to claim 5, characterized in that: The central axes of the fifth oil inlet screw plug (16), the fourth oil hole (n) and the oil guide hole (o) of the fourth valve core (17) are coaxial.

7. A feedback oil circuit for multiple clutches, characterized in that: A feedback oil circuit control valve for multiple clutches as claimed in claim 1 or 2, further comprising a clutch I (19), a clutch II (20), a clutch III (21), a control valve I (22), a control valve II (23), a control valve III (24), an oil pump (25) and a secondary control valve (26), wherein the oil pump (25) is connected to the secondary control valve (26), and the control valves I (22), II (23) and III (24) are connected in parallel between the oil pump (25) and the secondary control valve (26). ), the control valve I (22) is respectively connected to the clutch I (19) and the first oil inlet screw plug (6) of the feedback oil circuit control valve (100), the control valve II (23) is respectively connected to the clutch II (20) and the second oil inlet screw plug (7) of the feedback oil circuit control valve (100), the control valve III (24) is respectively connected to the clutch III (21) and the third oil inlet screw plug (8) of the feedback oil circuit control valve (100), and the oil outlet (A) of the feedback oil circuit control valve (100) is connected to the secondary control valve (26).

8. A method for controlling a feedback oil circuit for multiple clutches as claimed in claim 7, characterized in that:

1. Single clutch independent working control method: 1.1 Clutch I (19) operation: The control valve I (22) moves to the closing and discharging position, and the oil pump (25) starts to fill the oil cylinder of the clutch I (19). At the same time, the working oil flows from the first oil inlet screw plug (6) into the left side of the first transverse oil chamber (a). The working oil is fed back to the secondary control valve (26) through the second oil hole (g), the first oil ring groove (d) and the oil outlet (A) on the first valve core (2). 1.2 Clutch II (20) Operation: The control valve II (23) moves to the closing position, and the oil pump (25) starts to fill the oil cylinder of the clutch II (20). At the same time, the working oil flows from the second oil inlet screw plug (7) into the lower side of the first longitudinal oil chamber (b). The working oil flows through the second oil hole (g), the second oil ring groove (e) and the first oil hole (c) on the second valve core (4) to the oil guide hole (o) of the first valve core (2). Under the action of the working oil pressure, the first compression spring (3) is compressed, the first valve core (2) moves to the left end, the right side of the first transverse oil chamber (a) is connected to the oil outlet (A), and the working oil is fed back to the secondary control valve (26) through the first oil ring groove (d) and the oil outlet (A). 1.3 Clutch III (21) operation: The control valve III (24) moves to the closing position, and the oil pump (25) starts to fill the clutch III (21) cylinder with oil. At the same time, the working oil flows from the third oil inlet screw plug (8) into the upper side of the first longitudinal oil chamber (b). Under the action of the oil pressure, the second valve core (4) is pushed downward, the second compression spring (5) is compressed, the second valve core (4) moves to the lower end position, the upper side of the first longitudinal oil chamber (b) is connected to the right side of the first transverse oil chamber (a), and under the action of the working oil pressure, the first compression spring (3) is compressed, the first valve core (2) moves to the left end, the right side of the first transverse oil chamber (a) is connected to the oil outlet (A), and the working oil is fed back to the secondary control valve (26) through the first oil ring groove (d) and the oil outlet (A); 2. Any two sets of clutches work in combination 2.1 Clutch I (19) and clutch II (20) work simultaneously: When the clutch I (19) is first engaged, the process is the same as the engagement process of the clutch I (19) in method 1.1; when the clutch II (20) is then engaged, the working oil is introduced into the lower side of the first longitudinal oil chamber (b), the lower side of the first longitudinal oil chamber (b) is connected to the right side of the first transverse oil chamber (a), the oil pressure on the left and right sides of the first valve core (2) is equal, and under the action of the first compression spring (3), the position of the first valve core (2) remains unchanged, the feedback oil pressure P2 at the second oil inlet screw plug (7) is cut off, and the feedback oil pressure P1 at the first oil inlet screw plug (6) is the feedback oil pressure of the clutch I (19) and the clutch II (20); 2.2 Clutch I (19) and clutch III (21) work simultaneously: When the clutch I (19) is first engaged, the process is the same as the engagement process of the clutch I (19) in method 1.1; when the clutch III (21) is then engaged, the working oil is introduced into the upper side of the first longitudinal oil chamber (b), and the second compression spring (5) is compressed under the action of the oil pressure, the second valve core (4) moves to the lower end position, the upper side of the first longitudinal oil chamber (b) is connected to the right side of the first transverse oil chamber (a), the oil pressure on the left and right sides of the first valve core (2) is equal, and under the action of the first compression spring (3), the position of the first valve core (2) remains unchanged, the feedback oil pressure P3 at the third oil inlet screw plug (8) is cut off, and the feedback oil pressure P1 at the first oil inlet screw plug (6) is the feedback oil pressure of the clutch I (19) and the clutch III (21); 2.3 Clutch II (20) and clutch III (21) work simultaneously: When clutch II (20) is first engaged, the process is the same as the engagement process of clutch II (20) in method 1.2; when clutch III (21) is then engaged, the working oil is introduced into the upper side of the first longitudinal oil chamber (b), the oil pressures on the upper and lower sides of the second valve core (4) are equal, and under the action of the second compression spring (5), the position of the second valve core (4) remains unchanged, and the feedback oil pressure P3 at the third oil inlet screw plug (8) is cut off; the feedback oil pressure P2 at the second oil inlet screw plug (7) is the feedback oil pressure of clutch II (20) and clutch III (21); 3. Clutch I (19), clutch II (20) and clutch III (21) work in combination: When clutch I (19) is first engaged, the process is the same as the engagement process of clutch I (19) in method 1.1; when clutch II (20) is then engaged, the working oil is introduced into the lower side of the first longitudinal oil chamber (b), the lower side of the first longitudinal oil chamber (b) is connected to the right side of the first transverse oil chamber (a), the oil pressures on the left and right sides of the first valve core (2) are equal, and under the action of the first compression spring (3), the position of the first valve core (2) remains unchanged, and the feedback oil pressure P2 at the second oil inlet screw plug (7) is cut off; when clutch III (21) is finally engaged, the working oil is introduced into the upper side of the first longitudinal oil chamber (b), the oil pressures on the upper and lower sides of the second valve core (4) are equal, and under the action of the second compression spring (5), the position of the second valve core (4) remains unchanged, and the feedback oil pressure P3 at the third oil inlet screw plug (8) is cut off; the feedback oil pressure P1 at the first oil inlet screw plug (6) is the feedback oil pressure of clutch I (19), clutch II (20) and clutch III (21).

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