A modular power shift hydraulic multi-way valve

Abstract

The present invention discloses a modular power shift hydraulic multi-way valve, comprising a first-link valve body and a tail-link valve body, with a plurality of intermediate-link valve bodies connected in series between the first-link valve body and the tail-link valve body; the multi-way valve has a significant modular feature, and the number of intermediate-link valve bodies can be determined according to the gear requirements of the vehicle; each intermediate link controls a shift clutch, and the intermediate links work independently without interfering with each other, and can realize the engagement and disengagement of any two clutches, as well as the engagement and disengagement of multiple clutches, and is suitable for power shift clutch control of various power routes.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control technology, and in particular to a modular power shift hydraulic multi-way valve. Background Art

[0002] Power shift technology is one of the key core technologies for modern agricultural machinery, typified by high-horsepower tractors. With the continuous advancement of agricultural modernization, power shift transmissions controlled by power shift multi-way valves have increasingly become standard equipment for modern agricultural machinery in order to reduce workload and improve operational efficiency and human-machine interaction. As the core of power shift transmission control, the power shift multi-way valve is a core hydraulic component of high-end agricultural machinery. Its performance directly affects the shifting performance of the power shift transmission, and thus the operational performance of the agricultural machinery. Existing power shift hydraulic valves are all monolithic structures with complex internal oil passages, high costs, and poor maintenance. Furthermore, each valve block is only suitable for the power shift control of one vehicle type, which does not conform to the modular design concept. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a modular power shift hydraulic multi-way valve with stable performance and wide application.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a modular power shift hydraulic multi-way valve, comprising a first-link valve body and a tail-link valve body, wherein a plurality of intermediate-link valve bodies are connected in series between the first-link valve body and the tail-link valve body;

[0005] The first-link valve body is provided with an oil inlet and a pressure measuring interface, the first-link valve body is provided with a first-link oil inlet channel opening toward the middle-link valve body, the oil inlet and the pressure measuring interface are both communicated with the first-link oil inlet channel, and the first-link valve body is provided with a first-link oil return channel running through the first-link valve body;

[0006] An intermediate valve cavity is provided within the intermediate valve body, an intermediate valve core is installed within the intermediate valve cavity, and an intermediate driving device for controlling the movement of the intermediate valve core is installed on the intermediate valve body; an intermediate oil inlet channel and an intermediate oil return channel are provided within the intermediate valve body, which pass through the intermediate valve body and communicate with the intermediate valve cavity; a working oil port and a pressure measuring interface are provided on the intermediate valve body, which communicate with the intermediate valve cavity;

[0007] A tail-link valve cavity is provided in the tail-link valve body, a tail-link valve core is installed in the tail-link valve cavity, and a tail-link driving device for controlling the movement of the tail-link valve core is installed on the tail-link valve body; a tail-link oil inlet channel and a tail-link oil return channel are installed on the tail-link valve body, which are open to the middle-link valve body, and the tail-link oil inlet channel and the tail-link oil return channel are both connected to the tail-link valve cavity;

[0008] The first link oil inlet passage, the middle link oil inlet passage and the last link oil inlet passage are in communication, and the first link oil return passage, the middle link oil return passage and the last link oil return passage are in communication.

[0009] As a preferred technical solution, the intermediate link driving device includes an intermediate link electromagnet installed on the intermediate link valve body and transmission connected to one end of the intermediate link valve core, and the intermediate link valve body at the other end of the intermediate link valve core is installed with a spring end cover for sealing the intermediate link valve cavity, and an intermediate link return spring is installed between the spring end cover and the intermediate link valve core.

[0010] As a preferred technical solution, the intermediate electromagnet is a proportional electromagnet.

[0011] As a preferred technical solution, a load-sensitive channel communicating with the working oil port and the pressure measuring interface is provided in the intermediate connecting valve body, and a detachable screw plug is installed at the port of the load-sensitive channel.

[0012] As a preferred technical solution, the intermediate valve core includes an intermediate core shaft, and the intermediate core shaft is provided with a shaft shoulder for controlling the connection and disconnection of the working oil port and the intermediate valve cavity. One end of the intermediate core shaft is provided with a spring seat that slides with the inner wall of the intermediate valve cavity, and the other end of the intermediate core shaft is provided with a guide seat that slides with the inner wall of the intermediate valve cavity.

[0013] As a preferred technical solution, a plurality of U-shaped grooves for buffering hydraulic shock are symmetrically arranged on the shaft shoulder.

[0014] As a preferred technical solution, the tail-link drive device includes a tail-link electromagnet installed on the tail-link valve body and transmission-connected to one end of the tail-link valve core, and a tail-link return spring is installed between the other end of the tail-link valve core and the closed bottom end of the tail-link valve chamber.

[0015] As a preferred technical solution, the bottom ends of the first-link valve body and the tail-link valve body are both provided with mounting seats extending to both sides of the valve body, and each of the mounting seats is provided with mounting holes located on both sides of the first-link valve body or the tail-link valve body.

[0016] Due to the adoption of the above technical solution, a modular power shift hydraulic multi-way valve includes a first-link valve body and a tail-link valve body, and a plurality of intermediate-link valve bodies are connected in series between the first-link valve body and the tail-link valve body; the multi-way valve has a significant modular feature and can determine the number of intermediate-link valve bodies according to the vehicle gear requirements; each intermediate link controls a shift clutch, and each intermediate link works independently without interfering with each other, and can realize the engagement and disengagement of any two clutches, as well as the engagement and disengagement of multiple clutches, and is suitable for power shift clutch control of various power routes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention having four intermediate valve bodies;

[0019] Figure 2 This is a structural diagram of the first joint valve body of an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the first joint valve body of an embodiment of the present invention;

[0021] Figure 4 This is a structural diagram of an interlinked valve body according to an embodiment of the present invention;

[0022] Figure 5 is a cross-sectional view of an interlinked valve body according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic structural diagram of an inter-connected valve core in an embodiment of the present invention;

[0024] Figure 7 This is a schematic structural diagram of the tail valve body according to an embodiment of the present invention;

[0025] Figure 8 2. It is a cross-sectional view of the tail valve body according to an embodiment of the present invention;

[0026] Figure 9 This is a schematic structural diagram of the tail-connected valve core according to an embodiment of the present invention;

[0027] Figure 10 is a hydraulic principle diagram of an embodiment of the present invention;

[0028] Figure 11 It is a workflow diagram of an embodiment of the present invention;

[0029] In the figure: 11-first joint valve body; 12-oil inlet; 13-first joint oil inlet channel; 14-first joint oil return channel; 15-pressure measuring interface; 21-intermediate joint valve body; 22-intermediate joint valve chamber; 23-intermediate joint valve core; 24-intermediate joint oil inlet channel; 25-working oil port; 26-intermediate joint oil return channel; 31-intermediate joint electromagnet; 32-spring end cover; 33-intermediate joint return spring; 41-intermediate joint core shaft; 42-shaft shoulder; 43-U-shaped groove; 44-spring seat; 45-guide seat; 51-tail joint valve body; 52-tail joint valve chamber; 53-tail joint valve core; 54-tail joint oil inlet channel; 55-tail joint oil return channel; 56-tail joint electromagnet; 57-tail joint return spring; 61-mounting seat; 62-mounting hole; 71-load sensitive channel; 72-screw plug. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is understood that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0031] like Figure 1 and Figure 10 As shown, a modular power shift hydraulic multi-way valve comprises a first valve body 11 and a tail valve body 51, wherein a plurality of intermediate valve bodies 21 are connected in series between the first valve body 11 and the tail valve body 51;

[0032] like Figure 2 and Figure 3 As shown, the first-link valve body 11 is provided with an oil inlet 12 and a pressure measuring interface 15, and the first-link valve body 11 is provided with a first-link oil inlet channel 13 opening toward the intermediate valve body 21, the oil inlet 12 and the pressure measuring interface 15 are both communicated with the first-link oil inlet channel 13, and the first-link valve body 11 is provided with a first-link oil return channel 14 running through the first-link valve body 11;

[0033] like Figure 4 and Figure 5 As shown, an intermediate valve cavity 22 is provided in the intermediate valve body 21, an intermediate valve core 23 is installed in the intermediate valve cavity 22, and an intermediate driving device for controlling the movement of the intermediate valve core 23 is installed on the intermediate valve body 21; an intermediate oil inlet passage 24 and an intermediate oil return passage 26 are provided in the intermediate valve body 21, which pass through the intermediate valve body 21 and communicate with the intermediate valve cavity 22; a working oil port 25 and a pressure measuring interface 15 are provided on the intermediate valve body 21, which communicate with the intermediate valve cavity 22;

[0034] The intermediate link drive device includes an intermediate link electromagnet 31 mounted on the intermediate link valve body 21 and drivingly connected to one end of the intermediate link valve core 23. The intermediate link electromagnet 31 is a proportional electromagnet. A spring end cap 32 is mounted on the intermediate link valve body 21 at the other end of the intermediate link valve core 23 to seal the intermediate link valve chamber 22. An intermediate link return spring 33 is installed between the spring end cap 32 and the intermediate link valve core 23. A load-sensing channel 71 is provided within the intermediate link valve body 21, communicating with the working oil port 25 and the pressure measuring interface 15. A removable screw plug 72 is installed at the end of the load-sensing channel 71. An O-ring is installed between the spring end cap 32 and the intermediate link valve body 21, and an O-ring is also installed between the intermediate link electromagnet 31 and the intermediate link valve body 21.

[0035] like Figure 6 As shown, the intermediate valve core 23 includes an intermediate core shaft 41, and the intermediate core shaft 41 is provided with a shaft shoulder 42 for controlling the connection and disconnection of the working oil port 25 and the intermediate valve cavity 22, and the shaft shoulder 42 is symmetrically provided with a plurality of U-shaped grooves 43 for buffering hydraulic shock; one end of the intermediate core shaft 41 is provided with a spring seat 44 that slides with the inner wall of the intermediate valve cavity 22, and the other end of the intermediate core shaft 41 is provided with a guide seat 45 that slides with the inner wall of the intermediate valve cavity 22.

[0036] like Figure 7 、 Figure 8 and Figure 9 As shown, a tail-link valve cavity 52 is provided in the tail-link valve body 51, a tail-link valve core 53 is installed in the tail-link valve cavity 52, and a tail-link driving device for controlling the action of the tail-link valve core 53 is installed on the tail-link valve body 51; a tail-link oil inlet channel 54 and a tail-link oil return channel 55 are installed on the tail-link valve body 51, which are open to the intermediate valve body 21, and the tail-link oil inlet channel 54 and the tail-link oil return channel 55 are both connected to the tail-link valve cavity 52; the first-link oil inlet channel 13, the intermediate-link oil inlet channel 24 and the tail-link oil inlet channel 54 are connected, and the first-link oil return channel 14, the intermediate-link oil return channel 26 and the tail-link oil return channel 55 are connected.

[0037] The tail-link driving device includes a tail-link electromagnet 56 installed on the tail-link valve body 51 and transmission-connected to one end of the tail-link valve core 53. The tail-link electromagnet 56 can be an ordinary electromagnet. A tail-link return spring 57 is installed between the other end of the tail-link valve core 53 and the closed bottom end of the tail-link valve chamber 52.

[0038] The bottom ends of the first-connected valve body 11 and the tail-connected valve body 51 are both provided with mounting seats 61 extending to both sides of the valve body. Each mounting seat 61 is provided with mounting holes 62 located on both sides of the first-connected valve body 11 or the tail-connected valve body 51.

[0039] The present invention provides a modular power shift hydraulic multi-way valve with typical modular structural features. Different modules are used to control the shift clutches of different gears. The modules work together to achieve smooth and fast power shifting.

[0040] The oil inlet 12 on the first-link valve body 11 is the entrance for external hydraulic oil to enter the valve group; the pressure measuring interface 15 is used to detect the total working pressure of the power shift valve control system; the oil inlet 12 and the pressure measuring interface 15 are both standard hydraulic interfaces to facilitate the connection of hydraulic pipelines; the hydraulic oil enters the first-link oil inlet channel 13 through the oil inlet 12 and then enters the subsequent intermediate module and returns to the oil tank through the return oil channel; the first-link valve body 11, the intermediate valve body 21 and the tail-link valve body 51 are all distributed with a plurality of connection holes for fixed connection of the valve group; the mounting holes 62 on the first-link valve body 11 and the tail-link valve body 51 are used for mounting the valve group;

[0041] The intermediate link is the control valve block for each gear of the power shift, and adopts electro-hydraulic proportional control. Each intermediate link controls a power shift clutch cylinder piston, and is controlled by the controller program. It can work alone or in conjunction with each other; its structure includes an intermediate link valve body 21 and an intermediate link valve core 23; the working oil port 25 set on the intermediate link valve body 21 is externally connected to the power shift control clutch, and the hydraulic oil flows out through the working oil port 25 and establishes working pressure in the clutch to realize shift control; the pressure measuring interface 15 of the intermediate link valve body 21 is used to detect the power shift working pressure of the corresponding gear; the intermediate link oil inlet channel 24 is directly connected to the first link oil inlet channel 13; the intermediate link return oil channel 26 is directly connected to the first link return oil channel 14; the load sensitive channel 71 is used for load sensitive control. When the system needs to increase the load sensitive control demand, the system pressure can be drawn out through this channel, and the working pressure can be detected in real time and used for system control.

[0042] The intermediate link valve core 23 is used to control the on / off of the oil circuit; its right side is connected to a proportional solenoid, and its left side is connected to a return spring. When the proportional solenoid is energized, the valve core moves leftward, opening the working oil circuit, and hydraulic oil from the intermediate link oil inlet channel 24 enters the power shift clutch through the working oil port 25. When the proportional solenoid is de-energized, the intermediate link valve core 23 moves rightward under the action of the intermediate link return spring 33, disconnecting the working oil circuit. Simultaneously, the working oil port 25 is connected to the intermediate link oil return channel 26, and the hydraulic oil returns to the tank through the intermediate link oil return channel 26, achieving unloading. U-shaped grooves 43 are formed on both sides of the shaft shoulder 42 of the intermediate link valve core 23 to reduce hydraulic shock.

[0043] The tail link is a normally open on-off valve, which consists of a tail link valve body 51 and a tail link valve core 53. The tail link valve body 51 includes a tail link oil inlet passage, a tail link oil return passage, and a mounting hole 62. The tail link oil inlet passage 54 is directly connected to the middle link oil inlet passage 24; the tail link oil return passage 55 is directly connected to the middle link oil return passage 26. The connecting hole on the tail link valve body 51 is used to connect the valve group; the mounting hole 62 on the tail link valve body 51 is used to install the valve group.

[0044] The tail-link valve core 53 is used to control the opening and closing of the oil inlet channel of the power shift valve group. It is connected to a common electromagnet on the right side and a return spring on the left side. When the electromagnet is not energized, the valve core moves to the right under the action of the return spring, and the tail-link oil inlet channel 54 is directly connected to the tail-link oil return channel 55, realizing oil return of the hydraulic system. When the electromagnet is energized, the valve core moves to the left, disconnecting the tail-link oil inlet channel 54 and the tail-link oil return channel 55, so that the working pressure of the intermediate link can be normally established.

[0045] The present invention takes a four-speed power shift transmission control as an example, which requires four intermediate valve bodies 21 to control four power shift clutch cylinders respectively, thereby realizing the control of four power shift gears.

[0046] During the processing of the valve body, some holes will be generated. For some holes that do not need to be opened on the end face of the valve body, screw plugs 72 can be used to close them to form a closed oil channel environment.

[0047] like Figure 10 and Figure 11 As shown, when the power shift valve group is not working, the middle link electromagnet 31 and the tail link electromagnet 56 are not energized. At this time, the hydraulic oil enters the first link valve body 11 through the oil inlet 12 of the first link, enters the intermediate link oil inlet channels 24 through the first link oil inlet channel 13, enters the tail link oil inlet channel 54, passes through the tail link oil return channel 55, enters the intermediate link oil return channels 26 and the first link oil return channel 14, and finally returns to the oil tank to realize the circulation of the hydraulic system; when working, first the tail link electromagnet 56 is energized, and the tail link valve core 53 is closed, so that the hydraulic oil cannot enter the oil tank through the tail link oil return channel 55, thereby generating Working pressure is generated. At this time, according to external control requirements, the proportional solenoid of the corresponding intermediate link is controlled to be energized, the corresponding intermediate link valve core 23 is opened, and the hydraulic oil can enter the corresponding power shift clutch through the working oil port 25 of the corresponding intermediate link to realize the gear engagement; when shifting, the tail link valve core 53 is kept stationary to maintain the system pressure, and the intermediate link valve core 23 of the current gear is opened according to the power shift control logic, and the intermediate link valve core 23 of the gear to be engaged is closed at the same time to complete the gear shifting action; when disengaging, the intermediate link valve core 23 of the current gear is first opened to realize unloading, and then the tail link valve core 53 is opened to complete the gear disengaging action.

[0048] The present invention has the following beneficial effects:

[0049] 1. When the power shift valve group is not working, the intermediate link proportional solenoid and the tail link solenoid 56 are both de-energized. At this time, the hydraulic oil enters the valve body through the oil inlet 12 of the first link, enters each intermediate link through the oil inlet channel, enters the oil channel of the tail link, and returns to the oil tank through the oil return channel of each intermediate link and the oil return channel of the first link, thus realizing the circulation of the hydraulic system; when working, the tail link solenoid 56 is first energized, and the tail link valve core 53 is closed, so that the hydraulic oil cannot enter the oil tank through the tail link oil return channel 55, thereby generating working pressure in the intermediate link oil inlet channel 24. At this time, according to external control requirements, the proportional solenoid of the corresponding intermediate link is controlled to be energized, and the corresponding intermediate link valve core 23 is opened, so that the hydraulic oil can enter the corresponding power shift clutch to realize the gear engagement;

[0050] When shifting gears, taking the shift from first gear to second gear as an example, the first gear clutch needs to be disengaged and the second gear clutch engaged at the same time. At this time, the intermediate link proportional electromagnet of the first gear clutch is de-energized, and the corresponding intermediate link valve core 23 moves to the right, so that the working oil port 25 of the intermediate link of the first gear clutch is connected with the intermediate link oil return channel 26, thereby unloading the pressure of the first gear clutch; at the same time, the intermediate link proportional electromagnet of the second gear clutch is energized to engage the second gear clutch and complete the gear shifting action.

[0051] 2. The power shift valve group has a significant modular feature and can determine the number of intermediate links according to the vehicle gear requirements. Each intermediate link controls a shift clutch. Each intermediate link works independently without interfering with each other. It can realize the engagement and disengagement of any two clutches, as well as the engagement and disengagement of multiple clutches, and is suitable for power shift clutch control of various power routes.

[0052] 3. A load-sensing control interface is reserved in the middle of the power shift valve group. A load-sensing control system can be optionally installed according to work requirements. If not required, the load-sensing interface can be blocked with a screw plug 72 without affecting the normal function of the valve group.

[0053] 4. The product has a simple appearance and internal structure. The blanks involved are of regular shape. The required mold structure is simple and the development cost is low. The processing features involved are end face, outer circle or channel processing, with low processing cost, which facilitates mass production.

[0054] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A modular power shift hydraulic multi-way valve, comprising a first valve body and a tail valve body, characterized in that: A plurality of intermediate valve bodies are connected in series between the first valve body and the last valve body; The first-link valve body is provided with an oil inlet and a pressure measuring interface, the first-link valve body is provided with a first-link oil inlet channel opening toward the middle-link valve body, the oil inlet and the pressure measuring interface are both communicated with the first-link oil inlet channel, and the first-link valve body is provided with a first-link oil return channel running through the first-link valve body; An intermediate valve cavity is provided within the intermediate valve body, an intermediate valve core is installed within the intermediate valve cavity, and an intermediate driving device for controlling the movement of the intermediate valve core is installed on the intermediate valve body; an intermediate oil inlet channel and an intermediate oil return channel are provided within the intermediate valve body, which pass through the intermediate valve body and communicate with the intermediate valve cavity; a working oil port and a pressure measuring interface are provided on the intermediate valve body, which communicate with the intermediate valve cavity; A tail-link valve cavity is provided in the tail-link valve body, a tail-link valve core is installed in the tail-link valve cavity, and a tail-link driving device for controlling the movement of the tail-link valve core is installed on the tail-link valve body; a tail-link oil inlet channel and a tail-link oil return channel are installed on the tail-link valve body, which are open to the middle-link valve body, and the tail-link oil inlet channel and the tail-link oil return channel are both connected to the tail-link valve cavity; The first-link oil inlet channel, the middle-link oil inlet channel and the tail-link oil inlet channel are connected, the first-link oil return channel, the middle-link oil return channel and the tail-link oil return channel are connected, the middle-link oil inlet channels of the middle-link valve bodies are connected in series, and the middle-link oil return channels of the middle-link valve bodies are connected in parallel; when the middle-link valve core is in the right position, the working oil port is connected to the middle-link oil return channel; when the middle-link valve core is in the left position, the middle-link oil inlet channel is connected to the working oil port; when the tail-link valve core is in the right position, the tail-link oil inlet channel is connected to the tail-link oil return channel; when the tail-link valve core is in the left position, the tail-link oil inlet channel is disconnected from the tail-link oil return channel, and working pressure is generated in the middle-link oil inlet channel.

2. The modular power shift hydraulic multi-way valve according to claim 1, characterized in that: The intermediate link driving device includes an intermediate link electromagnet installed on the intermediate link valve body and transmission connected to one end of the intermediate link valve core. The intermediate link valve body at the other end of the intermediate link valve core is installed with a spring end cover for sealing the intermediate link valve cavity. An intermediate link return spring is installed between the spring end cover and the intermediate link valve core.

3. The modular power shift hydraulic multi-way valve according to claim 2, characterized in that: The intermediate electromagnet is a proportional electromagnet.

4. The modular power shift hydraulic multi-way valve according to claim 1, characterized in that: A load-sensitive channel communicating with the working oil port and the pressure measuring interface is provided in the intermediate connecting valve body, and a detachable screw plug is installed at the port of the load-sensitive channel.

5. The modular power shift hydraulic multi-way valve according to claim 1, characterized in that: The intermediate valve core includes an intermediate core shaft, and the intermediate core shaft is provided with a shaft shoulder for controlling the connection and disconnection of the working oil port and the intermediate valve cavity. One end of the intermediate core shaft is provided with a spring seat that slides with the inner wall of the intermediate valve cavity, and the other end of the intermediate core shaft is provided with a guide seat that slides with the inner wall of the intermediate valve cavity.

6. The modular power shift hydraulic multi-way valve according to claim 5, characterized in that: A plurality of U-shaped grooves for buffering hydraulic shock are symmetrically arranged on the shaft shoulder.

7. The modular power shift hydraulic multi-way valve according to claim 1, characterized in that: The tail-link driving device includes a tail-link electromagnet installed on the tail-link valve body and transmission-connected to one end of the tail-link valve core, and a tail-link return spring is installed between the other end of the tail-link valve core and the closed bottom end of the tail-link valve cavity.

8. The modular power shift hydraulic multi-way valve according to any one of claims 1 to 7, characterized in that: The bottom ends of the first-connected valve body and the tail-connected valve body are both provided with mounting seats extending to both sides of the valve body, and each of the mounting seats is provided with mounting holes located on both sides of the first-connected valve body or the tail-connected valve body.

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