Gear engaging hydraulic control valve block

Abstract

A gear engaging hydraulic control valve block relates to the technical field of valve blocks and comprises a valve block body which is provided with an oil inlet and an oil return port. The oil inlet is connected with a pressure stabilizing valve and an energy accumulator, the oil inlet is connected with two first proportional valves in parallel, oil outlets of the two first proportional valves are connected with a gear shifting bidirectional telescopic cylinder and are connected with oil inlets in the two ends of the gear shifting bidirectional telescopic cylinder, the oil inlet is further connected with a second proportional valve, and an oil outlet of the second proportional valve is connected with a hydraulic clutch. The utility model solves the problem that the gear engagement cannot be accurately controlled due to the fact that the gear engagement force is not accurately grasped and the gear engagement is easy to be over-position or the gear cannot be engaged in the gear engagement process when the tractor is in the gear engagement process by manual gear engagement in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of valve blocks, in particular to a shifting hydraulic control valve block. Background Technique

[0002] The so-called power shift technology is to control the shifting of the tractor gearbox through a wet clutch and realize the uninterrupted shifting and reversing operations of the transmission through a hydraulic control system. Due to the very complex working conditions of the tractor, which involves supporting different agricultural machinery to complete different agronomic operations, the tractor has a very large number of gear settings. At present, almost all domestic tractors in China are mechanically shifted, with complex mechanical shifting operations, low efficiency, high driver labor intensity, and a greater impact on the quality of tractor operations.

[0003] A patent with a publication number of CN214466020U is disclosed in the prior art, which includes a main box shift selection and execution mechanism, a sub-box shift selection and execution mechanism, and a gearbox. The main box shift selection and execution mechanism and the sub-box shift selection and execution mechanism are respectively installed on the gearbox. Driving blocks are respectively connected to the main box shift selection and execution mechanism and the sub-box shift selection and execution mechanism and drive the driving blocks to move. The driving blocks cooperate with the driving grooves in the gearbox for shift selection and shifting. The electronically controlled electric shift control developed for the mechanical gearbox is mainly driven by several DC brushed motors to realize the shifting action of the gearbox and can achieve the automation of shift selection and shifting.

[0004] With the use of the prior art including the above patent, the deficiencies of this technology have gradually emerged, mainly manifested in the following aspects:

[0005] When the existing tractors are shifting gears, they are all manually shifted. Due to the inaccurate grasp of the shifting force, it is easy to have the phenomenon of overshifting or failure to shift gears during the shifting process, resulting in inaccurate control of gear shifting.

[0006] In summary, it can be seen that the prior art is obviously inconvenient and defective in actual use, so it is necessary to improve it. Content of the Utility Model

[0007] Aiming at the defects in the prior art, the utility model solves the problem that when the tractors in the traditional technology are shifting gears, they are all manually shifted. Due to the inaccurate grasp of the shifting force, it is easy to have the phenomenon of overshifting or failure to shift gears during the shifting process, resulting in inaccurate control of gear shifting.

[0008] To solve the above problems, the utility model provides the following technical solutions:

[0009] The gear shifting hydraulic control valve block includes a valve block body, and an oil inlet and an oil return port are provided on the valve block body; a pressure stabilizing valve and an accumulator are connected to the oil inlet, two first proportional valves are connected in parallel to the oil inlet, the oil outlets of the two first proportional valves are connected to a shift bidirectional telescopic cylinder and are connected to the oil inlets at both ends of the shift bidirectional telescopic cylinder,

[0010] A second proportional valve is further connected to the oil inlet, and the oil outlet of the second proportional valve is connected to a hydraulic clutch.

[0011] As an optimized solution, two second proportional valves are provided, and the number of hydraulic clutches matches it.

[0012] As an optimized solution, a first pressure sensor and a temperature sensor are further connected to the oil inlet.

[0013] As an optimized solution, second pressure sensors are respectively connected to the oil outlets of the two second proportional valves.

[0014] As an optimized solution, an oil inlet passage is provided in the valve block body, and the oil inlet, the pressure stabilizing valve, the accumulator, the first pressure sensor and the temperature sensor are all connected to the oil inlet passage.

[0015] As an optimized solution, the outlet end of the oil inlet passage is connected to a main oil passage, and the oil inlets of the two first proportional valves are respectively connected to the main oil passage through first oil inlet pipelines.

[0016] As an optimized solution, the oil inlets of the two second proportional valves are respectively connected to the main oil passage through second oil inlet pipelines.

[0017] As an optimized solution, the oil return ports of the two first proportional valves are respectively connected to the oil return port through first oil return pipelines.

[0018] As an optimized solution, the oil return ports of the two second proportional valves are respectively connected to the oil return port through second oil return pipelines.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] By setting a pressure stabilizing valve and an accumulator, the pressure on the main oil passage is ensured to be stable. Through the two first proportional valves connected to the main oil passage, the shift bidirectional telescopic cylinder is driven to work, and the gear shifting work is realized. Among them, the use of hydraulic control can ensure the accuracy of gear shifting and the operation is labor-saving, overcoming the problems brought by mechanical gear shifting in the traditional technology;

[0021] By connecting the second proportional valve in parallel on the main oil passage, the hydraulic clutch can also be accurately controlled, greatly improving the work efficiency. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw to actual scale.

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic diagram of the hydraulic principle of the present invention.

[0025] In the figure: 1-valve block body; 2-inlet port; 3-outlet port; 4-first proportional valve; 5-accumulator; 6-second proportional valve; 7-temperature sensor; 8-first pressure sensor; 9-second pressure sensor; 10-pressure stabilizing valve; 11-shifting bi-directional telescopic cylinder; 12-shifting bi-directional telescopic cylinder; 13-inlet oil path; 14-main oil path; 15-first inlet oil pipeline; 16-second inlet oil pipeline; 17-first return oil pipeline; 18-second return oil pipeline. Specific embodiments

[0026] The following will describe in detail the embodiments of the technical solutions of the present invention in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0027] As Figure 1 and Figure 2 shown, the shifting hydraulic control valve block includes a valve block body 1, and an inlet port 2 and an outlet port 3 are provided on the valve block body 1; a pressure stabilizing valve 10 and an accumulator 5 are connected to the inlet port 2, and two first proportional valves 4 are connected in parallel to the inlet port 2. The outlet ports of the two first proportional valves 4 are connected to a shifting bi-directional telescopic cylinder and are connected to the inlet ports 2 at both ends of the shifting bi-directional telescopic cylinder.

[0028] A second proportional valve 6 is also connected to the inlet port 2, and the outlet port of the second proportional valve 6 is connected to a hydraulic clutch.

[0029] Interfaces for connecting various pressure sensors, temperature sensors, hydraulic clutches, and shifting bi-directional telescopic cylinders are provided on the outer wall of the valve block body 1.

[0030] There are two second proportional valves 6, and the number of hydraulic clutches matches it.

[0031] A first pressure sensor 8 and a temperature sensor 7 are also connected to the inlet port 2.

[0032] The oil outlets of two second proportional valves 6 are respectively connected with second pressure sensors 9.

[0033] An oil inlet passage 13 is provided in the valve block body 1, and the oil inlet 2, the pressure stabilizing valve 10, the accumulator 5, the first pressure sensor 8 and the temperature sensor 7 are all connected to the oil inlet passage 13.

[0034] The outlet end of the oil inlet passage 13 is connected with a main oil passage 14, and the oil inlets 2 of two first proportional valves 4 are respectively connected to the main oil passage 14 through first oil inlet pipelines 15.

[0035] The oil inlets 2 of two second proportional valves 6 are respectively connected to the main oil passage 14 through second oil inlet pipelines 16.

[0036] The oil return ports 3 of two first proportional valves 4 are respectively connected to the oil return port 3 through first oil return pipelines 17.

[0037] The oil return ports 3 of two second proportional valves 6 are respectively connected to the oil return port 3 through second oil return pipelines 18.

[0038] The working principle of this device is as follows:

[0039] By setting the pressure stabilizing valve 10 and the accumulator 5, the pressure on the main oil passage 14 is ensured to be stable. Through two first proportional valves 4 connected to the main oil passage 14, the shift double-acting telescopic cylinder is driven to work, and the gear shifting work is realized. Among them, by using hydraulic control, the accuracy of gear shifting can be ensured, and the operation is labor-saving, overcoming the problems brought by mechanical gear shifting in the traditional technology;

[0040] By paralleling the second proportional valve 6 on the main oil passage 14, the precise control of the hydraulic clutch can also be realized, greatly improving the working efficiency.

[0041] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. The shift hydraulic control valve block is characterized in that: It includes a valve block body (1), and an oil inlet (2) and an oil return port (3) are provided on the valve block body (1); a pressure stabilizing valve (10) and an accumulator (5) are connected to the oil inlet (2), and two first proportional valves (4) are connected in parallel to the oil inlet (2). The oil outlets of the two first proportional valves (4) are connected to a shift bidirectional telescopic cylinder and are connected to the oil inlets (2) at both ends of the shift bidirectional telescopic cylinder. A second proportional valve (6) is also connected to the oil inlet (2), and the oil outlet of the second proportional valve (6) is connected to a hydraulic clutch.

2. The shift hydraulic control valve block according to claim 1, characterized in that: There are two second proportional valves (6), and the number of the hydraulic clutches matches it.

3. The shift hydraulic control valve block according to claim 2, wherein: A first pressure sensor (8) and a temperature sensor (7) are also connected to the oil inlet (2).

4. The shift hydraulic control valve block according to claim 2, wherein: Second pressure sensors (9) are respectively connected to the oil outlets of the two second proportional valves (6).

5. The shift hydraulic control valve block according to claim 4, wherein: An oil inlet passage (13) is provided in the valve block body (1), and the oil inlet (2), the pressure stabilizing valve (10), the accumulator (5), the first pressure sensor (8), and the temperature sensor (7) are all connected to the oil inlet passage (13).

6. The shift hydraulic control valve block according to claim 5, characterized in that: The outlet end of the oil inlet passage (13) is connected to a main oil passage (14), and the oil inlets (2) of the two first proportional valves (4) are respectively connected to the main oil passage (14) through first oil inlet pipelines (15).

7. The shift hydraulic control valve block according to claim 6, characterized in that: The oil inlets (2) of the two second proportional valves (6) are respectively connected to the main oil passage (14) through second oil inlet pipelines (16).

8. The shift hydraulic control valve block according to claim 1, characterized in that: The oil return ports (3) of the two first proportional valves (4) are respectively connected to the oil return port (3) through first oil return pipelines (17).

9. The shift hydraulic control valve block according to claim 2, characterized in that: The oil return ports (3) of the two second proportional valves (6) are respectively connected to the oil return port (3) through second oil return pipelines (18).

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