Oil path control pressure stabilizing structure and pressure stabilizing and speed changing valve system of loader gearbox

Abstract

The utility model provides an oil path control pressure-stabilizing structure and a pressure-stabilizing speed-changing valve system of a loader gearbox, and belongs to the technical field of speed-changing valves. The oil way control pressure stabilizing structure comprises a pressure stabilizing body, the pressure stabilizing body comprises a main seat body, and the main seat body is provided with a first channel and a second channel which are three-dimensionally communicated; the first channel is connected to a main oil way in series. One end of the branch oil way is connected with the main oil way, and the other end is connected with the second channel; an electromagnetic valve is arranged on the branch oil way; the valve rod is connected into the second channel in a sliding mode, an oil hole and a throttling hole which are communicated with the first channel are formed in the valve rod, and a throttling state or a straight-through state can be formed; the regulating and controlling assembly is connected with the valve rod and can be matched with the valve rod to move to achieve switching between the throttling state and the straight-through state. The pressure stabilizing and speed changing valve system of the loader gearbox comprises the oil way control pressure stabilizing structure. The gear shifting process can be softer, and the experience of a driver can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical field of variable speed valve especially relates to oil circuit control pressure stabilizing structure and loader gearbox's pressure stabilizing variable speed valve system. BACKGROUND

[0002] The variable speed valve of the current traditional planetary gearbox, when switching gear, the oil inlet of the transmission oil into the gear clutch will open all at once, resulting in the gear oil pressure rising linearly in the moment of shifting. This will cause the clutch piston to press the friction plate for too short time, the transmission oil pressure rises too fast, resulting in strong shift impact, reducing the driver's experience, can refer to the attached Figure 5 , attached Figure 5 Pressure test curve of the gear shifting process. In view of the above problem, it is necessary to improve. UTILITY MODEL CONTENTS

[0003] In order to solve the problem of strong shift impact and reduce the driver's experience in the prior art, the utility model provides oil circuit control pressure stabilizing structure and loader gearbox's pressure stabilizing variable speed valve system. The utility model makes the gear shifting process more gentle, which can improve the driver's experience.

[0004] The technical scheme for solving the technical problem of the utility model is:

[0005] Firstly, the utility model provides oil circuit control pressure stabilizing structure, which comprises a pressure stabilizing body, and the pressure stabilizing body comprises:

[0006] The main seat body is provided with a first channel and a second channel which are three-dimensional and intersected; the first channel is provided with an oil inlet and an oil outlet at both ends respectively, and the first channel is connected in series on the main oil circuit;

[0007] The branch oil circuit is provided with an oil inlet end in front of the oil inlet, the oil inlet end of the branch oil circuit is connected with the main oil circuit, and the oil outlet end of the branch oil circuit is connected with one end of the second channel; the electromagnetic valve is arranged on the branch oil circuit;

[0008] The valve rod is arranged on the first channel and the throttle hole for regulating the oil outlet amount of the first channel, and the valve rod is slidably connected in the second channel;

[0009] The valve rod is provided with an oil hole and a throttle hole which are communicated with the first channel; the first channel can be communicated with the throttle hole alone to form a throttling state; the first channel can also be communicated with the throttle hole and the oil hole at the same time to form a straight-through state;

[0010] The regulating assembly is connected with the valve rod and can realize the switching of the throttling state and the straight-through state by moving together with the valve rod.

[0011] Preferably, the regulating assembly comprises a first elastic member and a second elastic member arranged on both sides of the valve rod; one end of the second elastic member is connected with the right end of the valve rod, and the other end is connected with the inner wall of the second channel; one end of the first elastic member is connected with the left end of the valve rod, and the other end is connected with the plug column, and the plug column is in sealing sliding connection with the second channel.

[0012] Preferably, the first elastic member and the second elastic member are both springs.

[0013] Preferably, the diameter of the oil hole is greater than the diameter of the throttling hole.

[0014] Preferably, the second channel is a blind hole structure, one end of the second channel is an open end, and the other end is a closed end.

[0015] In the second aspect, the technical scheme also provides a stable pressure shifting valve system of a loader gearbox, comprising the oil path control stable pressure structure.

[0016] Preferably, the system further comprises a pressure regulating valve, a brake valve and a gear shifting valve, two oil inlet paths are formed by connecting pipelines at the oil inlet of the system, which are an oil inlet path a and an oil inlet path b respectively, the oil inlet path a is in communication with the pressure regulating valve, and an oil outlet path c is formed after the oil inlet path a is adjusted by the pressure regulating valve, the oil outlet path c is in communication with a torque converter; the oil inlet path b is connected with a main oil path, and the main oil path is sequentially connected with the oil path control stable pressure structure, the brake valve and the gear shifting valve; the gear shifting valve is further connected with an oil return path, and the oil return path has two oil return branches, which are a first oil return branch and a second oil return branch respectively, and the end of the first oil return branch is connected with the pressure regulating valve; and the end of the second oil return branch is connected with an oil tank.

[0017] The above technical scheme has the following advantages or beneficial effects:

[0018] 1. The oil path control stable pressure structure is designed, the oil path control stable pressure structure is designed to adjust the valve rod, the valve rod has an oil hole and a throttling hole, the left and right movements of the valve rod can form a throttling state or a straight-through state, so that the transmission oil flow rate during the compression of the friction plate by the clutch piston can be controlled, the gear shifting process is more gentle, and the experience of the driver is improved.

[0019] 2. By appropriately increasing the time for the clutch piston to compress the friction plate, the service life of the piston and the friction plate can be increased, and the quality and reliability of the gearbox are improved.

[0020] 3. The utility model is convenient to use, high in practicality, applicable to the transformation of existing oil paths, and does not change the overall appearance structure, the overall internal oil channel and the mounting hole of the original transmission valve, so that the original product can be directly replaced for assembly and use. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application.

[0022] Figure 1 is a structural schematic diagram of the oil path control pressure stabilizing structure (throttling state) of the present application.

[0023] Figure 2 is a structural schematic diagram of the oil path control pressure stabilizing structure (straight-through state) of the present application.

[0024] Figure 3 is a structural enlarged schematic diagram of the valve rod in the present application.

[0025] Figure 4 is a principle block diagram of the pressure stabilizing gear valve system of the loader gearbox.

[0026] Figure 5 is a pressure test curve of the shifting process before the present application is adopted.

[0027] Figure 6 is a pressure test curve of the shifting process after the present application is adopted.

[0028] Explanation of reference signs:

[0029] D, pressure stabilizing body; 1, main seat body; 2, first channel; 3, second channel; 4, second elastic member; 5, valve rod; 501, throttling hole; 502, oil hole; 6, first elastic member; 7, plunger; 8, main oil path; 9, branch oil path; 91, electromagnetic valve; 10, pressure regulating valve; 11, brake valve; 12, gear valve; 13, oil inlet path a; 14, oil inlet path b; 15, oil tank; 16, oil return path; 17, first oil return branch; 18, second oil return branch; 19, oil outlet path c. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In addition, it should be noted that in the description of this utility model, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to mechanical connection or electrical connection; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] Example 1:

[0034] like Figure 1 - Figure 3 As shown, this embodiment proposes an oil circuit control pressure stabilization structure, including a pressure stabilization body D. The pressure stabilization body D mainly includes three parts, namely the main seat body 1, the valve stem 5 and the control component, which are described below:

[0035] Part 1:

[0036] The main seat body 1 has a shape including but not limited to a rectangular, circular or other special-shaped structures; the main seat body 1 is provided with a first channel 2 and a second channel 3 that intersect in three dimensions; the first channel 2 has an oil inlet and an oil outlet at both ends respectively, and the first channel 2 is connected in series to the main oil circuit 8, and the medium in the main oil circuit 8 can flow to the oil outlet through the oil inlet of the first channel 2.

[0037] In addition to the main oil circuit 8, a branch oil circuit 9 is also included. Its oil inlet is located in front of the oil inlet, forming two flow channels before the oil inlet of the first channel 2. The oil inlet of the branch oil circuit 9 is connected to the main oil circuit 8, and its oil outlet is connected to one end of the second channel 3. A solenoid valve 91 is installed in the branch oil circuit 9. This solenoid valve 91 is electrically connected to a controller, which controls the opening and closing of the solenoid valve 91 and adjusts its opening degree.

[0038] Part II:

[0039] A valve stem 5 is used to control the oil flow rate of the first channel 2. Slidingly connected to the second channel 3, the valve stem 5 can slide left and right along the second channel 3. The valve stem 5 is provided with an oil hole 502 and a throttle hole 501, both of which communicate with the first channel 2. The first channel 2 can communicate with the throttle hole 501 alone, forming a throttled state. The first channel 2 can also communicate with both the throttle hole 501 and the oil hole 502 simultaneously, forming a straight-through state. These two different states allow for oil flow regulation.

[0040] Part III:

[0041] The regulating component is connected to the valve stem 5 and can cooperate with the movement of the valve stem 5 to realize the switching between the throttling state and the straight-through state.

[0042] As a feasible embodiment, the control component can adopt the following structural form:

[0043] It includes a first elastic member 6 and a second elastic member 4 arranged on both sides of the valve stem 5; one end of the second elastic member 4 is connected to the right end of the valve stem 5, and the other end is connected to the inner wall of the second channel 3; one end of the first elastic member 6 is connected to the left end of the valve stem 5, and the other end is connected to the plunger 7. The plunger 7 is in sealing and sliding connection with the second channel 3, and the plunger 7 can move left and right along the second channel 3. When a certain pressure is applied to the plunger 7, the plunger 7 can move and squeeze the first elastic member 6, thereby driving the valve stem 5 to move.

[0044] In this embodiment, the first elastic member 6 and the second elastic member 4 can both be springs. Of course, the first elastic member 6 and the second elastic member 4 can also adopt other elastic structures, such as airbags, rubber, air cushions, silicone and other elastic materials.

[0045] In this embodiment, the diameter of the oil hole 502 is larger than the diameter of the throttle hole 501 , the oil hole 502 serves as a main channel, and the throttle hole 501 serves as a secondary channel.

[0046] In this embodiment, the second channel 3 is a blind hole structure or a through structure. In this embodiment, it is preferably a blind hole structure. One end of the second channel 3 is an open end and the other end is a closed end. One end of the second elastic member 4 is directly connected to the closed end.

[0047] Example 2:

[0048] like Figure 4 As shown, this embodiment also proposes a pressure-stabilizing speed-changing valve system for a loader transmission, including the oil circuit control pressure-stabilizing structure in the first embodiment.

[0049] Specifically, the pressure-stabilizing speed-changing valve system of the loader gearbox also includes a pressure regulating valve 10, a brake valve 11, and a shift valve 12. The oil inlet of the system is connected by a pipeline to form two oil inlet circuits, namely, oil inlet circuit a13 and oil inlet circuit b14.Figure 4 P represents the oil inlet; the oil inlet circuit a13 is connected to the pressure regulating valve 10, and forms the oil outlet circuit c19 after adjustment by the pressure regulating valve 10, and the oil outlet circuit c19 is connected to the torque converter; the oil inlet circuit b14 is connected to the main oil circuit 8, and the main oil circuit 8 is connected in sequence with the oil circuit control pressure stabilizing structure, the brake valve 11 and the shift valve 12; the shift valve 12 is also connected to the return oil circuit 16, and the return oil circuit 16 has two return oil branches, namely the first return oil branch 17 and the second return oil branch 18. The end of the first return oil branch 17 is connected to the pressure regulating valve 10; the end of the second return oil branch 18 is connected to the fuel tank 15.

[0050] Working principle:

[0051] like Figure 4 As shown, according to Figure 4 The various components are installed and connected in a manner; the oil inlet of the system is divided into two channels, namely the oil inlet line a13 and the oil inlet line b14. A part of the transmission oil flows into the pressure regulating valve 10 through the oil inlet line a13. After the pressure of this part of the transmission oil is adjusted by the pressure regulating valve 10, it flows to the torque converter through the oil outlet line c19; the other part of the transmission oil flows to the main oil circuit 8 connected in series with the oil inlet line b14 through the oil inlet line b14. The transmission oil comes to the oil circuit control and pressure stabilizing structure through the main oil circuit 8. After the pressure is stabilized and regulated by the oil circuit control and pressure stabilizing structure, the transmission oil flows along the main oil circuit 8 to the brake valve 11 and the shift valve 12 in sequence; then, it flows out through the shift valve 12 and flows into the return oil pipeline. Part of the transmission oil in the return oil pipeline flows back to the pressure regulating valve 10 through the first oil return branch 17, and part flows back to the oil tank 15 through the second oil return branch 18.

[0052] When the oil circuit pressure stabilizing structure is in the throttling state, the transmission oil can only be supplied through the throttling hole 501; when the oil circuit pressure stabilizing structure is in the straight-through state, the transmission oil is supplied through the large oil hole 502 and the small throttling hole 501 at the same time.

[0053] Theoretical calculation shows that the transmission oil pressure required for the clutch piston of the 5-ton loader to compress the friction plate is 0.6 Mpa. Based on this, before the gear clutch oil pressure rises to 0.6 Mpa, the electromagnetic valve 91 of the branch oil circuit 9 is controlled to be closed by the controller, at this time, the pressure on the left side of the valve rod 5 is less than the elastic force of the second elastic member 4 on the right side, at this time, the valve rod 5 moves left, the throttle hole 501 of the oil circuit control pressure maintaining structure is controlled to be opened alone, a throttling state is formed, and the transmission oil enters the clutch through the throttle hole 501; when the transmission oil pressure is greater than 0.6 Mpa, the electromagnetic valve 91 of the branch oil circuit 9 is controlled to be opened and closed by the controller, after being opened and closed, at this time, the pressure on the left side of the valve rod 5 is greater than the elastic force of the second elastic member 4 on the right side, at this time, the valve rod 5 moves right, the throttle hole 501 and the oil hole 502 of the oil circuit control pressure maintaining structure are controlled to be opened at the same time, a straight-through state is formed, and the transmission oil directly enters the clutch, and the gear oil pressure rapidly rises to the maximum value. According to the above control logic, the time of the clutch piston and the friction plate compression process can be appropriately increased, so that the gear shifting process is more gentle, and the experience of the driver is improved.

[0054] Application test:

[0055] As shown in Figure 5 , Figure 5 is a pressure test curve of a gear shifting process before the utility model is adopted, it can be seen that when the transmission oil enters the gear clutch, the oil inlet of the gear clutch is opened all at once, so that the gear oil pressure rises in a straight line at the moment of gear shifting.

[0056] As shown in Figure 6 , Figure 6 is a pressure test curve of a gear shifting process after the utility model is adopted, after the utility model is adopted, the gear shifting process is more gentle, and the problem that the gear oil pressure rises in a straight line at the moment of gear shifting in the prior art is solved.

[0057] Application effect:

[0058] Firstly, the utility model discloses an oil circuit control pressure maintaining structure, the oil circuit control pressure maintaining structure is designed to be provided with an adjustable valve rod 5, the valve rod 5 is provided with an oil hole 502 and a throttle hole 501, the left and right movement of the valve rod 5 can form a throttling state or a straight-through state, so that the transmission oil flow during the compression of the clutch piston and the friction plate can be controlled, the gear shifting process is more gentle, and the experience of the driver is improved.

[0059] Secondly, by appropriately increasing the time of the clutch piston to compress the friction plate, the service life of the plunger 7 and the friction plate can be increased, and the quality and reliability of the gearbox are improved.

[0060] Thirdly, the utility model is convenient to use, high in practicality, can be applied to the transformation of existing oil circuits, and the transformation does not change the overall appearance structure, internal overall oil passage and mounting hole of the original transmission valve, so that the original product can be directly replaced for assembly and use.

[0061] Although the specific embodiments of the utility model have been described above with reference to the drawings, the description is not a limitation on the protection scope of the utility model, and various modifications or changes made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. An oil path control pressure stabilizing structure comprising a pressure stabilizing body (D), characterized by, The voltage stabilizing body (D) comprises: A main body (1) having a first channel (2) and a second channel (3) penetrating each other, the first channel (2) having an oil inlet and an oil outlet at two ends thereof and being connected in series with a main oil passage (8); A branch oil passage (9) having an oil inlet end connected with the main oil passage (8) and an oil outlet end connected with one end of the second channel (3), and an electromagnetic valve (91) arranged on the branch oil passage (9); A valve rod (5) arranged in the second channel (3) and used for regulating the oil outlet of the first channel (2); The valve rod (5) has an oil hole (502) and a throttle hole (501) arranged thereon and communicating with the first channel (2), the first channel (2) being capable of communicating with the throttle hole (501) alone to form a throttling state, and the first channel (2) being capable of communicating with the throttle hole (501) and the oil hole (502) simultaneously to form a straight-through state; A regulating assembly connected with the valve rod (5) and capable of moving with the valve rod (5) to switch between the throttling state and the straight-through state.

2. The oil passage control pressure maintaining structure according to claim 1, characterized by The regulating assembly comprises a first elastic member (6) and a second elastic member (4) arranged on two sides of the valve rod (5), one end of the second elastic member (4) being connected with a right end of the valve rod (5) and the other end being connected with an inner wall of the second channel (3), one end of the first elastic member (6) being connected with a left end of the valve rod (5) and the other end being connected with a plunger (7) in sealing and sliding connection with the second channel (3).

3. The oil passage control pressure maintaining structure according to claim 2, characterized by The first elastic member (6) and the second elastic member (4) are both springs.

4. The hydraulic pressure control structure according to claim 1, characterized by The oil hole (502) has a diameter larger than that of the throttle hole (501).

5. The hydraulic pressure control structure according to claim 1, wherein The second channel (3) is a blind hole structure having an open end and a closed end.

6. A load-holding valve system for a loader transmission, characterized in that The oil passage control voltage stabilizing structure of any one of claims 1-5.

7. The load sense transmission valve system of the loader transmission of claim 6, wherein, The system further comprises a pressure regulating valve (10), a brake valve (11) and a gear shifting valve (12), two oil inlet passages, namely an oil inlet passage a (13) and an oil inlet passage b (14), are formed by connecting pipelines at an oil inlet of the system, the oil inlet passage a (13) communicates with the pressure regulating valve (10), an oil outlet passage c (19) is formed after the oil inlet passage a (13) is adjusted by the pressure regulating valve (10), the oil outlet passage c (19) communicates with a torque converter, the oil inlet passage b (14) is connected with the main oil passage (8), the main oil passage (8) is sequentially connected with the oil passage control voltage stabilizing structure, the brake valve (11) and the gear shifting valve (12), the gear shifting valve (12) is further connected with an oil return passage (16), the oil return passage (16) has two oil return branches, namely a first oil return branch (17) and a second oil return branch (18), and a terminal end of the first oil return branch (17) is connected with the pressure regulating valve (10), a terminal end of the second oil return branch (18) is connected with an oil tank (15).

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