Buffer valve for wide flow control system and pressure reducing method thereof

Abstract

The present invention provides a buffer valve for a wide-range flow control system and a pressure reducing method thereof, which are used for reducing the pressure of a hydraulic oil being transported, and include a valve body, an end cover, a proportional pressure reducing valve core, a quick return valve core and at least one spring, wherein the valve body has a cavity, wherein the end cover is retained in the axial direction of the valve body, wherein the end cover covers the valve body and closes the cavity, wherein the proportional pressure reducing valve core is axially retained in the cavity, wherein the quick return valve core is axially sleeved on the proportional pressure reducing valve core, wherein the quick return valve core is retained between the proportional pressure reducing valve core and the end cover, wherein the proportional valve core and the quick return valve core share the valve body, wherein the spring is retained between the proportional pressure reducing valve core and the quick return valve core, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core.

Description

Technical Field

[0001] The invention relates to the field of hydraulic control, and in particular to a buffer valve applied to a wide-range flow control system and a pressure reducing method thereof. Background Art

[0002] At present, the main engines of domestic engineering machinery, lifting and transportation machinery, etc. adopt the structure of hydraulic transmission and gearbox shifting, and most of the gearbox shifting control elements adopt the speed control valve to perform the shifting operation and realize the multi-gear power output of the main engine. Furthermore, the main engine can move forward, backward and park in neutral through the shifting operation of the gearbox control valve. The existing speed control valve is composed of a pressure regulating valve, a buffer valve, a reversing valve (or an electromagnetic reversing valve), a cut-off valve, etc.

[0003] It is worth noting that the buffer valve of the existing speed control valve, this traditional speed control valve, is limited by its design. Under different engine speed conditions, the hydraulic pressure characteristics vary greatly. The existing speed control valve is difficult to adapt to different engines to achieve ideal pressure regulation performance.

[0004] Most of the buffer valves designed in existing speed change valves adopt an accumulator-switch valve structure. The switching moment of the switch valve structure will cause a large impact load on the speed change system. Furthermore, the clutch chamber pressure of the speed change system is greatly affected by the pressure regulating valve of the speed change control valve. If the friction plate of the clutch is engaged too quickly or too slowly, it is easy to cause a large gear shift shock or equal gears, causing a large impact load on the transmission gearbox system, and more easily causing damage to parts such as the gearbox transmission shaft, bevel gear, and clutch friction plate.

[0005] In this context, how to achieve pressure proportional control shifting, further improve the reliability and life of the main engine, and improve the labor intensity of the operator is an important direction for improving the overall technical level of domestic power shift transmission systems. Summary of the invention

[0006] An object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide flow control system, so as to achieve precise regulation of the hydraulic pressure of the hydraulic oil.

[0007] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide-range flow control system, which realizes pressure regulation during multi-gear power output of a mechanical transmission system to achieve stable gear shifting of the transmission system.

[0008] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide flow control system, which are integrated into hydraulic transmission systems such as engineering machinery and heavy-duty transport machinery to achieve smooth speed change.

[0009] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide-range flow control system, which will adjust the pressure of the hydraulic oil entering the clutch according to certain characteristics (pressure┄time relationship) over time to reduce damage to the components of the transmission system caused by rapid changes in hydraulic oil pressure.

[0010] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide-range flow control system, and a pressure reducing method thereof, which can realize smooth engagement of the friction plates of a clutch of the transmission system and reduce the mutual impact when the friction plates of the clutch are engaged.

[0011] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the speed control valve includes a shift valve, a system overflow valve and a buffer valve, wherein the shift valve performs shifting, the system overflow valve and the buffer valve are operated together, wherein the system overflow valve ensures the overflow pressure set by the system, and wherein the buffer valve adjusts the pressure increasing characteristics (pressure and time relationship) of the hydraulic oil filled into the transmission gear to achieve a smooth transition of the pressure of the hydraulic oil in the transmission gear.

[0012] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the buffer valve comprises a valve body, a proportional pressure reducing valve core, a quick return valve core and a spring, wherein the quick return valve core is axially sleeved on the proportional pressure reducing valve core, wherein the quick return valve core is retained in the axial direction of the proportional pressure reducing valve core, wherein the spring is retained between the proportional pressure reducing valve core and the quick return valve core, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core. When hydraulic oil enters the buffer valve, it is pressure-regulated by the buffer valve, and then the hydraulic oil enters the clutch to achieve a smooth pressure transition of the clutch.

[0013] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide-range flow control system, wherein the proportional pressure reducing valve core not only has the function of a proportional valve core but also has the function of a pressure reducing valve core, wherein the proportional pressure reducing valve core realizes precise pressure regulation, and the proportional pressure reducing valve core can be applied to a wide range of flows, and because of its characteristics of being less affected by the oil inlet flow, high integration, and stable pressure regulation, the function of smooth pressure regulation of the transmission system is realized.

[0014] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the proportional pressure reducing valve core includes a valve core and a spring, wherein the valve core is surrounded by the spring, and without the need for multiple valve cores and corresponding springs, the functions of the pressure reducing valve and the proportional valve of the proportional pressure reducing valve can be realized to achieve precise pressure regulation.

[0015] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the proportional pressure reducing valve core and the quick return valve core are assembled on the valve body, wherein one end of the proportional pressure reducing valve core is engaged with the quick return valve core, wherein the proportional pressure reducing valve core and the quick return valve core work together to achieve maintaining the pressure regulation characteristics of the hydraulic oil unchanged in the wide-range flow control system, thereby being applicable to the hydraulic oil pressure regulation under a wide-range flow.

[0016] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the buffer valve for a wide-range flow control system comprises a valve body, an end cover, a proportional pressure reducing valve core, a quick return valve core and at least one spring, wherein the valve body has a cavity, wherein the end cover is retained in the axial direction of the valve body, wherein the end cover covers the valve body and closes the cavity, wherein the proportional pressure reducing valve core is axially retained in the cavity, wherein the quick return valve core is axially confined to the proportional pressure reducing valve core, wherein the quick return valve core is retained between the proportional pressure reducing valve core and the end cover, wherein the proportional valve core and the quick return valve core share the valve body, wherein the spring is retained between the proportional pressure reducing valve core and the quick return valve core, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core.

[0017] Another object of the present invention is to provide a buffer valve for a wide-range flow control system and a pressure reducing method thereof, wherein the buffer valve for a wide-range flow control system comprises at least one oil port and an oil passage, wherein the cavity is defined by the valve body and the end cover, wherein at least one of the oil ports is formed in the oil passage, wherein the oil passage is connected to the cavity for the hydraulic oil to be connected to the cavity.

[0018] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide flow control system, wherein the oil port includes at least one throttling hole to slow down the hydraulic oil flowing to a proportional valve portion of the proportional pressure reducing valve and the chamber on one side of the quick return valve core.

[0019] Another object of the present invention is to provide a buffer valve and a pressure reducing method thereof for a wide-range flow control system, wherein the proportional pressure reducing valve includes a proportional valve portion and a pressure reducing valve portion, wherein the proportional valve portion and the pressure reducing valve portion are integrally prepared, wherein the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion to adjust the output hydraulic pressure of the hydraulic oil.

[0020] Other advantages and features of the present invention will become more apparent from the following detailed description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

[0021] According to one aspect of the present invention, a buffer valve for a wide flow control system of the present invention, which can achieve the above-mentioned objects and other objects and advantages, is used to reduce the pressure of a hydraulic oil being delivered, and comprises:

[0022] a valve body, wherein the valve body has a cavity;

[0023] an end cover, wherein the end cover is held in the axial direction of the valve body, wherein the end cover covers the valve body and closes the cavity;

[0024] a proportional pressure reducing valve core, wherein the proportional pressure reducing valve core is axially retained in the cavity;

[0025] a fast return valve core, wherein the fast return valve core is axially confined to the proportional pressure reducing valve core, wherein the fast return valve core is retained between the proportional pressure reducing valve core and the end cover, wherein the proportional valve core and the fast return valve core share the valve body; and

[0026] at least one spring, wherein the spring is held between the proportional pressure reducing valve core and the quick return valve core, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core;

[0027] The buffer valve for a wide-range flow control system has at least one oil port and an oil channel, wherein the cavity is defined by the valve body and the end cover, wherein at least one oil port is formed in the oil channel, and wherein the oil channel is connected to the cavity for the hydraulic oil to be connected to the cavity.

[0028] According to one embodiment of the present invention, the buffer valve for a wide-range flow control system further has a proportional pressure reducing valve and a quick return valve, wherein the proportional pressure reducing valve is composed of the proportional pressurizing valve core, the valve body and the spring, and the quick return valve is composed of the quick return valve core, the valve body and the spring.

[0029] According to one embodiment of the present invention, the proportional pressure reducing valve includes a proportional valve portion and a pressure reducing valve portion, wherein the proportional valve portion and the pressure reducing valve portion are integrally prepared, wherein the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion to adjust the output hydraulic pressure of the hydraulic oil.

[0030] According to one embodiment of the present invention, the proportional pressure reducing valve includes a pressure reducing through hole, a pressure reducing channel, a proportional through hole and a proportional channel, wherein the quick return valve includes a quick return chamber, wherein the pressure reducing through hole is connected to the pressure reducing channel, wherein the proportional through hole is connected to the proportional channel, wherein the quick return chamber is connected to the proportional channel, wherein the pressure reducing channel and the proportional channel extend in the same direction from the axial end face of the proportional pressure reducing valve core respectively.

[0031] According to one embodiment of the present invention, the buffer valve for a wide-range flow control system further has a first chamber, a second chamber and a third chamber, wherein the first chamber is defined by the valve body and the proportional pressure-reducing valve core, wherein the second chamber is defined by the valve body, the proportional pressure-reducing valve core and the quick-return valve core, wherein the third chamber is defined by the quick-return valve core, the end cover and the valve body, the first chamber and the pressure-reducing passage are connectable, wherein the second chamber, the proportional passage and the quick-return chamber are connectable, and when the pressure-reducing passage, the second chamber and the third chamber have a certain hydraulic pressure difference and area difference, the proportional pressure-reducing valve core and the quick-return valve core can move axially movably, and the proportional pressure-reducing valve core can adjust the hydraulic pressure of the hydraulic oil by controlling the hydraulic pressure and flow space of the hydraulic oil flowing from the proportional pressure-reducing valve core.

[0032] According to one embodiment of the present invention, the oil port includes an oil inlet, an oil outlet, a first oil port, a second oil port and at least one throttling hole, wherein the oil inlet is connected to the first oil port, wherein the first oil port is connected to the pressure reducing through hole to connect the pressure reducing channel, wherein the second oil port connects the pressure reducing channel and the oil outlet for inputting the hydraulic oil from the oil inlet and outputting the decompressed hydraulic oil from the oil outlet, wherein the throttling hole decelerates the hydraulic oil delivered from the oil inlet to the proportional through hole and the third chamber, so that the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion.

[0033] According to an embodiment of the present invention, there are two throttling holes, and the two throttling holes are used to slow down the hydraulic oil flowing to the proportional valve part and the third chamber respectively in a secondary damping manner.

[0034] According to one embodiment of the present invention, when the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion, the spring is compressed, wherein the second volume chamber space is squeezed for the pressure reducing valve portion to adjust the hydraulic pressure of the hydraulic oil.

[0035] According to one embodiment of the present invention, the oil port further includes a third oil port and a fourth oil port, wherein after the throttling hole controls the flow rate of the hydraulic oil, part of the hydraulic oil enters the third volume chamber from the fourth oil port, and part of the hydraulic oil is conducted from the third oil port to the proportional through hole, so that the hydraulic oil enters the proportional channel from the third oil port, wherein the hydraulic oil can be conducted into the second volume chamber from the third oil port.

[0036] According to one embodiment of the present invention, the oil port further includes an oil return port, wherein the oil return port and the second volume chamber, the quick return chamber and the pressure reducing valve channel are connectable, and when shifting gears, the oil return port and the fourth oil port return oil, wherein the quick return valve is restored.

[0037] According to another aspect of the present invention, the present invention further provides a decompression method, further comprising the following steps:

[0038] (a) reducing the pressure of the hydraulic oil by a pressure reducing valve portion of a proportional pressure reducing valve; and

[0039] (b) decelerating the hydraulic oil flowing to a proportional valve portion of a proportional pressure reducing valve and a third volume chamber respectively through at least one throttling hole; and

[0040] (c) The pressure of the hydraulic oil is pressure-regulated by being squeezed and compressed by a proportional pressure reducing valve and a spring of a quick return valve core respectively abutting against the pressure reducing valve portion.

[0041] According to one embodiment of the present invention, the step (b) further comprises the following steps:

[0042] The hydraulic oil flowing to the proportional valve part of the proportional pressure reducing valve and the third volume chamber respectively is decelerated in a two-stage damping manner through the two throttling holes.

[0043] According to one embodiment of the present invention, the step (c) further comprises the following steps:

[0044] By means of the limited flow of the hydraulic oil and the squeezing of the quick return valve, the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion, and the pressure of the hydraulic oil is adjusted in a displacement manner.

[0045] Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and the accompanying drawings.

[0046] These and other objects, features and advantages of the present invention will be more fully understood from the following detailed description, accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic cross-sectional view of a speed control valve according to a preferred embodiment of the present invention.

[0048] Figure 2 It is a schematic cross-sectional view from another angle of the buffer valve of the above preferred embodiment of the present invention.

[0049] Figure 3 It is a schematic diagram of the working process of the buffer valve of the above preferred embodiment of the present invention.

[0050] Figure 4 It is a schematic diagram of the working process of the buffer valve of the above preferred embodiment of the present invention when shifting.

[0051] Figure 5 It is a bottom view schematic diagram of the speed control valve of the above preferred embodiment of the present invention.

[0052] Figure 6 It is a schematic diagram of the hydraulic oil flow lines of the above preferred embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0054] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0055] refer to Figures 1 to 6The first preferred embodiment of the present invention discloses a buffer valve for a wide flow control system and a pressure reducing method thereof in detail, wherein the speed control valve comprises a buffer valve 10, a system overflow valve 20 and a shift valve 30, wherein the shift valve 30 performs shifting, wherein the buffer valve 10 and the system overflow valve 20 are respectively connected to the shift valve 30, wherein the system overflow valve 20 and the buffer valve 10 are operated together, wherein the system overflow valve 20 ensures the overflow pressure set by the system, wherein the buffer valve 10 adjusts the hydraulic oil pressure increase characteristic (pressure and time relationship) to be conducted, so as to realize the wide flow control system to keep the hydraulic oil pressure regulation characteristic unchanged, thereby being applied to the hydraulic oil pressure regulation under a wide flow.

[0056] Further, the system overflow valve 20 and the buffer valve 10 are arranged on the valve body 11 along the axial direction, wherein the system overflow valve 20 and the buffer valve 10 share the valve body 11 to reduce the volume of the speed control valve.

[0057] The buffer valve 10 and the system overflow valve 20 are conductively connected to the shift valve 30. The hydraulic oil decompressed by the buffer valve 10 is conducted to a clutch 50 after passing through the shift valve 30, so that a friction plate of the clutch 50 rubs violently when it is engaged.

[0058] Furthermore, the buffer valve 10 receives the hydraulic oil provided by a variable speed pump 40, wherein the buffer valve 10 is conductively connected to the clutch 50, wherein after the buffer valve 10 receives the flowing hydraulic oil, the hydraulic oil is pressure-regulated by the buffer valve 10 and then conducted to the clutch 50, so as to achieve a smooth pressure transition of the transmission system.

[0059] Further, the buffer valve 10 includes a valve body 11, a proportional pressure-reducing valve core 12, a quick return valve core 13 and at least one spring 14 and has a chamber 100, wherein the proportional pressure-reducing valve core 12, the quick return valve core 13 and the spring 14 are assembled in the valve body 11. In other words, the proportional pressure-reducing valve core 12, the quick return valve core 13 and the spring 14 are accommodated in the chamber 100. Further, the proportional pressure-reducing valve core 12 and the quick return valve core 13 are axially connected, and the proportional pressure-reducing valve core 12 and the quick return valve core 13 are axially embedded in the valve body 11. The proportional pressure-reducing valve core 12 is surrounded by the spring 14, and the functions of the pressure-reducing valve and the proportional valve can be realized without multiple valve cores and corresponding springs, so as to achieve precise pressure regulation.

[0060] The number of the springs 14 is more than two. Specifically, one of the springs 14 is axially sleeved on the proportional pressure reducing valve core 12 and limited by the quick return valve core 13 and the proportional pressure reducing valve core 12, wherein the spring 14 is retained between the proportional pressure reducing valve core 12 and the quick return valve core 13, wherein the spring 14, the proportional pressure reducing valve core 12 and the valve body 11 jointly realize the functions of the proportional valve and the pressure reducing valve, wherein the other spring 14 is axially sleeved on the quick return valve core 13, wherein the spring 14, the quick return valve core 13 and the valve body 11 jointly realize the function of the quick return valve.

[0061] Furthermore, the buffer valve 10 further includes a proportional pressure reducing valve 120 and a quick return valve 130, wherein the proportional pressure reducing valve 120 and the quick return valve 130 share the same valve body 11, and the proportional pressure reducing valve 120 and the quick return valve 130 are axially sleeved, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core, which not only reduces the overall volume of the proportional pressure reducing valve 120 and the quick return valve 130, but also allows the hydraulic oil to be better pressure-adjusted by the proportional pressure reducing valve 120 in precise proportion and then flow into the quick return valve 130, the hydraulic oil is quickly depressurized by the quick return valve 130, and then enters the buffer valve 10.

[0062] The proportional pressure reducing valve 120 is held in the oil inlet direction of the quick return valve 130, and the quick return valve 130 extends axially from the proportional pressure reducing valve 120. In other words, the proportional pressure reducing valve 120 is sleeved on the oil inlet of the quick return valve 130, and the hydraulic oil is introduced into the quick return valve 130 after being accurately reduced in pressure by the proportional pressure reducing valve 120.

[0063] It is worth noting that the hydraulic pressure of the hydraulic oil controlling the quick return valve 130 is controlled and regulated by the proportional pressure reducing valve 120 .

[0064] Further, the buffer valve 10 includes an end cover 15, wherein the end cover 15 is retained at one end of the valve body 11, wherein the end cover 15 covers the valve body 11 and closes the cavity 100, wherein the quick return valve core 13 which is sleeved with the spring 14 extends axially from the end cover 15, wherein the quick return valve core 13 can be retained on the valve body 11 by being clamped by the proportional pressure reducing valve core 12 and the end cover 15.

[0065] The proportional pressure reducing valve 120 includes a pressure reducing valve part 121 and a proportional valve part 122, wherein the proportional valve part 122 and the pressure reducing valve part 121 are integrally prepared, wherein the pressure reducing valve part 121 reduces the pressure of the hydraulic oil, wherein the quick return valve 130 increases the hydraulic pressure of the hydraulic oil, wherein the proportional valve part 122 is subjected to the pressure difference and area difference between the quick return valve 130 and the pressure reducing valve part 121, and accurately regulates the pressure of the hydraulic oil, so that the pressure of the hydraulic oil conducted from the buffer valve 10 to the shift valve 30 is accurately regulated.

[0066] The proportional pressure reducing valve 120 further includes a pressure reducing through hole 123 and a proportional through hole 124 , wherein the pressure reducing through hole 123 is formed in the pressure reducing valve portion 121 of the proportional pressure reducing valve core 110 , and wherein the proportional through hole 124 is formed in the proportional valve portion 122 of the proportional pressure reducing valve core 110 .

[0067] Further, the proportional pressure reducing valve 120 has a pressure reducing channel 125 and a proportional channel 126 which are axially arranged, wherein the pressure reducing channel 125 and the proportional channel 126 are respectively extended in the same direction from the axial end surface of the proportional pressure reducing valve 120 and are maintained at intervals. The pressure reducing channel 125 is maintained in the pressure reducing valve part 121, wherein the proportional channel 126 is formed in the proportional valve part 122. The proportional valve part 122 is conductively connected to the quick return valve 130, wherein the pressure reducing channel 125 is conductively connected to the chamber 100.

[0068] The quick return valve 130 has a quick return chamber 131 , wherein the quick return valve 130 is maintained with its opening facing the direction of the proportional pressure reducing valve core 12 , wherein the quick return chamber 131 is in communication with the proportional passage 126 .

[0069] The pressure reducing through hole 123 of the proportional pressure reducing valve 120 is connected to the pressure reducing channel 125, and the hydraulic oil enters the pressure reducing channel 125 from the pressure reducing through hole 123. The proportional through hole 124 can be connected to the proportional channel 126, and the hydraulic oil enters the proportional channel 126 from the proportional through hole 124.

[0070] The chamber 100 can be connected to accommodate part of the hydraulic oil, and the quick return valve core 13 and the chamber exert axial pressure on the proportional pressure reducing valve core 12. When the proportional pressure reducing valve core 12 is subjected to the pressure difference in the axial direction and the force of the area difference, the proportional pressure reducing valve core 12 adjusts the pressure according to the pressure characteristics of the hydraulic oil.

[0071] The buffer valve 10 has a first cavity 101, a second cavity 102 and a third cavity 103, wherein the first cavity 101 is defined by the valve body 11 and the proportional pressure-reducing valve core 12, wherein the second cavity 102 is defined by the valve body 11, the proportional pressure-reducing valve core 12 and the quick return valve core 13, and the third cavity 103 is defined by the quick return valve core 13, the end cover 15 and the valve body 11. The first chamber 101 and the pressure reducing passage 125 are conductive, wherein the second chamber, the proportional passage 126 and the quick return chamber 130 are conductive, wherein the third chamber 103 is conductively connected to the at least one oil port, and when the pressure reducing passage 125, the second chamber 102 and the third chamber 103 have a certain hydraulic pressure difference and area difference, the proportional pressure reducing valve core 12 and the quick return valve core 13 can move axially, and precise pressure regulation of the proportional pressure reducing valve core 12 is achieved by controlling the hydraulic pressure and flow space of the hydraulic oil flowing from the proportional pressure reducing valve core 12.

[0072] refer to Figure 1 , Figure 2 and Figure 5 , a first preferred embodiment of the present invention is disclosed and explained in detail, wherein the buffer valve 10 further includes at least one oil port 16 and has an oil passage 160, wherein a plurality of the oil ports 16 define the oil passage 160, wherein the oil passage 160 is conductively connected to the volume chamber 100 of the buffer valve 10 to deliver the hydraulic oil to the buffer valve, wherein the hydraulic oil is able to adjust a hydraulic oil pressure increase characteristic (pressure and time relationship) transmitted by the hydraulic pressure of the buffer valve, wherein the oil port 16 is conductively connected to the oil passage 160, wherein the hydraulic oil of the oil port 16 can be conducted to the proportional pressure reducing valve 120 and the quick return valve 130, wherein the quick return valve 130 pressurizes the hydraulic oil, wherein the proportional pressure reducing valve 120 is used to achieve precise pressure regulation of the hydraulic oil.

[0073] The oil port 16 further includes an oil inlet 161 and an oil outlet 162, wherein the oil inlet 161 and the oil outlet 162 are connected to the oil passage 160. The oil port 16 includes a first oil port 163, a second oil port 164, at least one throttling hole 165, a third oil port 166 and a fourth oil port 167, wherein the first oil port 163 is connected to the oil inlet 161 and the pressure reducing through hole 123, so that the hydraulic oil can enter the pressure reducing passage 163 through the first oil port 163 and the pressure reducing through hole 123, wherein the second oil port 164 is connected to the pressure reducing passage 163, so that the hydraulic oil in the pressure reducing passage 163 is decompressed and discharged from the second oil port 164. The throttling hole 165 can be connected to the oil inlet 161, wherein the throttling hole 165 plays a damping role on the hydraulic oil. After the throttling hole 165 controls the flow rate of the hydraulic oil, part of the hydraulic oil enters the third cavity 103 from the fourth oil port 167, and part of the hydraulic oil is connected to the proportional through hole 124 from the third oil port 166, so that the hydraulic oil enters the proportional channel 126 from the third oil port 166, wherein the hydraulic oil can be connected from the third oil port 166 to enter the second cavity 102.

[0074] The first oil port 163 and the pressure reducing through hole 123 form a pressure reducing valve port, and the second oil port 165 and the proportional through hole 126 form a proportional valve port.

[0075] Combination Figure 1 and Figure 2 , the number of the throttling holes 165 is more than two, wherein the throttling holes 165 include a first damping hole 1651 and a second damping hole 1652, wherein the first throttling hole 1651 and the second throttling hole 1652 are respectively radially formed in the oil passage 160, wherein the first throttling hole 1651 and the second throttling hole 1652 are sequentially arranged along the oil passage 160, wherein the first damping hole 1651 and the second damping hole 1652 conduct the hydraulic oil of the oil inlet 161 to the proportional through hole 124 and the fourth oil port 167, through at least two levels of damping, the hydraulic oil is controlled to flow into the proportional through hole 124 and the fourth oil port 167 of the proportional pressure reducing valve 120, which can not only better regulate the pressure of the hydraulic oil to adjust the oil filling time of the clutch 50, but also avoid the rapid drop of the hydraulic oil pressure of the oil passage 160 when the oil is leaked. Furthermore, the first throttling hole 1651 and the second throttling hole 1652 respectively control the flow rate of the hydraulic oil to better reduce the pressure of the hydraulic oil.

[0076] It is worth noting that the hydraulic oil must pass through the first throttling hole 1651 and the second throttling hole 1652 to reduce the pressure before entering the next control system. The number and size of the radial throttling holes 165 only depend on the flow or load required by the load. The number and size of the throttling holes 165 are set to adapt to different loads of the transmission system and to adapt to different flows of the hydraulic oil. Therefore, the pressure and time characteristics of the output of the buffer valve 10 are not affected by the flow of the system input.

[0077] refer to Figure 5 , the oil port 16 further has an oil return port 168, wherein the oil return port 168 and the second volume chamber 102, the quick return chamber 130 and the pressure reducing valve channel 163 are connected. When the quick return valve 130 leaks oil, the hydraulic oil in the second volume chamber 102 flows back from the oil return port 168. The hydraulic oil in the third volume chamber 103 flows out from the fourth oil port 157 and the return port 168. When the quick return valve is in the process of shifting the gear of the main engine gearbox, the hydraulic oil in the third volume chamber 103 flows out from the fourth oil port 157 and the return port 168, wherein the second volume chamber 102 flows out from the return port 168.

[0078] refer to Figure 4 When the hydraulic oil is conducted to the buffer valve 10, the proportional pressure reducing valve core 12 and the quick return valve core 13 move relative to each other and are maintained, wherein the proportional pressure reducing valve core 12 and the quick return valve core 13 are squeezed, wherein the pressure reducing channel 125 of the proportional pressure reducing valve core 12 and the first volume chamber 101 are conducted, wherein the space of the second volume chamber 102 is compressed, wherein the space of the third volume chamber 103 is increased, and through the damping effect of the throttling hole 165, the hydraulic oil can be decelerated and circulated to the second volume chamber 102 and the third volume chamber 103, so that the pressure-time characteristic of the hydraulic oil output by the buffer valve 10 for a wide flow control system is not affected by the hydraulic oil flow rate input by the system.

[0079] The pressure reducing through hole 123 of a proportional pressure reducing valve 120 is conductively formed in the proportional pressure reducing valve 120 and the quick return valve 130, wherein the oil hole member 111 and the oil port 16 are respectively formed in the oil passage 160 of the valve body 11 and conductively connect the path of the hydraulic oil.

[0080] Further, the oil port 16 includes a conducting hole 169 , wherein the conducting hole 169 and the oil inlet 161 are arranged in the oil passage 160 , wherein the conducting hole 169 guides the hydraulic oil to the oil inlet 161 of the buffer valve.

[0081] The decompression method further comprises the following steps:

[0082] (a) reducing the pressure of the hydraulic oil by the pressure reducing valve portion 121 of the proportional pressure reducing valve 120; and

[0083] (b) decelerating the hydraulic oil flowing to the proportional valve portion 122 of the proportional pressure reducing valve 120 and the third chamber 103 respectively through at least one of the throttling holes 165; and

[0084] (c) The hydraulic oil is compressed by the springs respectively abutting against the proportional pressure reducing valve core 120 and the quick return valve core 130 to keep the hydraulic oil pressure regulated according to a certain characteristic (pressure┄time relationship) over time.

[0085] The step (b) of the decompression method further comprises the following steps:

[0086] (b.1) The hydraulic oil flowing to the proportional valve portion 122 of the proportional pressure reducing valve 120 and the third chamber 103 is decelerated in a two-stage damping manner through the two throttling holes 165 .

[0087] The step (c) of the decompression method further comprises the following steps:

[0088] (c.1) The hydraulic oil with limited flow is squeezed by the quick return valve 130, wherein the proportional valve portion 122 is affected by the pressure difference and area difference between the quick return valve 130 and the pressure reducing valve portion 121, and the pressure of the hydraulic oil is adjusted by displacement.

[0089] The implementation methods of the multiple embodiments can be combined freely, and the present invention is not limited in this regard.

[0090] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A buffer valve for a wide flow control system, for reducing the pressure of a delivered hydraulic oil, characterized in that: include: a valve body, wherein the valve body has a cavity; an end cover, wherein the end cover is held in the axial direction of the valve body, wherein the end cover covers the valve body and closes the cavity; a proportional pressure reducing valve core, wherein the proportional pressure reducing valve core is axially retained in the cavity; a quick return valve core, wherein the quick return valve core is axially sleeved on the proportional pressure reducing valve core, wherein the quick return valve core is retained between the proportional pressure reducing valve core and the end cover, wherein the proportional pressure reducing valve core and the quick return valve core share the valve body; as well as at least one spring, wherein the spring is held between the proportional pressure reducing valve core and the quick return valve core, wherein the spring is respectively abutted between the proportional pressure reducing valve core and the quick return valve core; The buffer valve for a wide flow control system has at least one oil port and an oil passage, wherein the chamber is defined by the valve body and the end cover, wherein at least one oil port is formed in the oil passage, and wherein the oil passage is connected to the chamber for the hydraulic oil to be connected to the chamber; wherein the valve body comprises a proportional pressure reducing valve and a quick return valve, wherein the proportional pressure reducing valve is composed of the proportional pressure reducing valve core, the valve body and the spring, wherein the quick return valve is composed of the quick return valve core, the valve body and the spring, wherein the proportional pressure reducing valve comprises a pressure reducing through hole, a pressure reducing channel, a proportional through hole and a proportional channel, wherein the quick return valve comprises a quick return chamber, wherein the pressure reducing through hole is connected to the pressure reducing channel, wherein the proportional through hole is connected to the proportional channel, wherein the quick return chamber is connected to the proportional channel, wherein the pressure reducing channel and the proportional channel extend in the same direction from the axial end face of the proportional pressure reducing valve core respectively; wherein the proportional pressure reducing valve comprises a proportional valve portion and a pressure reducing valve portion, wherein the proportional valve portion and the pressure reducing valve portion are integrally prepared, wherein the proportional valve portion is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve portion; The chamber comprises a first chamber, a second chamber and a third chamber, wherein the first chamber is defined by the valve body and the proportional pressure reducing valve core, wherein the second chamber is defined by the valve body, the proportional pressure reducing valve core and the quick return valve core, wherein the third chamber is defined by the quick return valve core, the end cover and the valve body, the first chamber and the pressure reducing passage are connectable, wherein the second chamber, the proportional passage and the quick return chamber are connectable, when the pressure reducing passage, the second chamber and the third chamber have a certain hydraulic pressure difference and area difference, the proportional pressure reducing valve core and the quick return valve core can move axially, and the proportional pressure reducing valve core can adjust the hydraulic pressure of the hydraulic oil by controlling the hydraulic pressure and the flow space of the hydraulic oil flowing from the proportional pressure reducing valve core; The oil port includes an oil inlet, an oil outlet, a first oil port, a second oil port and at least one throttling hole, wherein the oil inlet is connected to the first oil port, wherein the first oil port is connected to the pressure reducing through hole to connect the pressure reducing channel, wherein the second oil port connects the pressure reducing channel and the oil outlet, so that the hydraulic oil is input from the oil inlet and the decompressed hydraulic oil is output from the oil outlet, wherein the throttling hole decelerates the hydraulic oil delivered from the oil inlet to the proportional through hole and the third chamber, so that the proportional valve part is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve part.

2. The buffer valve for a wide-range flow control system according to claim 1, wherein there are two throttling holes, and the two throttling holes are used to slow down the hydraulic oil flowing to the proportional valve part and the third chamber respectively in a secondary damping manner.

3. According to the buffer valve for a wide flow control system according to claim 2, when the proportional valve part is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve part, the spring is compressed, and the space of the second cavity is squeezed for the pressure reducing valve part to adjust the hydraulic pressure of the hydraulic oil.

4. A buffer valve for a wide-range flow control system according to claim 2, wherein the oil port further includes a third oil port and a fourth oil port, wherein after the throttling hole controls the flow rate of the hydraulic oil, part of the hydraulic oil enters the third chamber from the fourth oil port, and part of the hydraulic oil is conducted from the third oil port to the proportional through hole, so that the hydraulic oil enters the proportional channel from the third oil port, wherein the hydraulic oil can be conducted from the third oil port into the second chamber.

5. A buffer valve for a wide flow control system according to claim 4, wherein the oil port further includes an oil return port, wherein the oil return port and the second volume chamber, the quick return chamber and the pressure reducing passage are conductive, and when shifting gears, the oil return port and the fourth oil port return oil, wherein the quick return valve is restored.

6. A method for reducing pressure, characterized in that: According to the buffer valve for a wide flow control system according to claim 1, it is achieved that: (a) reducing the pressure of the hydraulic oil by means of a pressure reducing valve portion of a proportional pressure reducing valve; and (b) decelerating the hydraulic oil flowing to a proportional valve portion of a proportional pressure reducing valve and a third volume chamber respectively through at least one throttling hole; and (c) The pressure of the hydraulic oil is regulated by pressure by being compressed by a spring which is respectively abutted against a pressure reducing valve part and a quick return valve core of the proportional pressure reducing valve; the pressure of the hydraulic oil is regulated by displacement by the hydraulic oil with limited flow and the squeezing of the quick return valve, wherein the proportional valve part is subjected to the pressure difference and area difference between the quick return valve and the pressure reducing valve part.

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