Hydraulic braking system capable of achieving decompression braking and tractor

Abstract

The utility model relates to a hydraulic braking system capable of realizing decompression braking and a tractor, the system comprises a left brake valve, a right brake valve and a decompression valve, and an oil outlet h on the decompression valve can be communicated with an oil inlet g or an oil return port i; the oil inlet g is communicated with one end of an oil inlet pipeline L5, and the oil return port i is communicated with one end of an oil return pipeline L6; the interface b on the left brake valve can be communicated with the interface a or the interface c; the oil outlet h is communicated with the interface c through a pipeline L1, and the interface a is communicated with the oil return pipeline L6 through a pipeline L2; the right brake valve is provided with an interface d, an interface e and an interface f, and the interface e can be communicated with the interface d or the interface f; the interface d is communicated with the pipeline L2 through a pipeline L3, and the interface f is communicated with the pipeline L1 through a pipeline L4. The single-side braking and double-side braking device is simple in structure, reasonable in design, capable of achieving free switching between single-side braking and double-side braking, capable of meeting different braking pressure requirements and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a hydraulic brake system capable of realizing decompression braking and a tractor. Background Art

[0002] Tractors are self-propelled power machines used to pull and drive machinery for various mobile tasks. They can also be used for stationary operations. They consist of an engine, transmission, propulsion, steering, hydraulic suspension, power take-off (PTO), electrical instruments, driving controls, and traction systems or devices. The engine power is transmitted to the drive wheels via the transmission system, enabling the tractor to move. Tractors are categorized by function and purpose into agricultural, industrial, and special-purpose types. By structural type, they are divided into wheeled, tracked, boat-type, and self-propelled chassis types.

[0003] At present, tractors in the existing technology have the following defects: 1. As the horsepower of the tractor increases, the volume of the brake cylinder increases, and the required power pump volume becomes larger and larger, making it difficult to arrange it in space; 2. As the driving speed increases, the required deceleration becomes larger and larger, and the braking pressure increases accordingly, which limits the output pressure of the power pump; 3. Currently, the power pump is mainly used to increase the low pressure to the pressure required for braking, and the pedal force during braking is relatively large. Utility Model Content

[0004] The utility model provides a hydraulic brake system and a tractor capable of realizing decompression braking, aiming to solve the problems in the prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A hydraulic brake system capable of achieving pressure-reducing braking, comprising a left brake valve, a right brake valve, and a pressure-reducing valve, wherein the pressure-reducing valve is provided with an oil inlet g, an oil outlet h, and an oil return port i, wherein the oil outlet h can be communicated with the oil inlet g or the oil return port i; the oil inlet g is communicated with one end of an oil inlet line L5, and the oil return port i is communicated with one end of an oil return line L6;

[0007] The left brake valve is provided with a port a, a port b, and a port c, wherein the port b can be communicated with the port a or the port c; the oil outlet h is communicated with the port c via a pipeline L1, and the port a is communicated with the oil return pipeline L6 via a pipeline L2;

[0008] The right brake valve is provided with interfaces d, e and f, and the interface e can be communicated with the interface d or the interface f; the interface d is communicated with the pipeline L2 through the pipeline L3, and the interface f is communicated with the pipeline L1 through the pipeline L4.

[0009] The beneficial effects of the utility model are as follows: during normal driving, the brake pedal is not depressed, all valves are in the lower position, the oil source pressure oil acts on the P port, and the pressure reducing valve is closed; the left brake valve and the right brake valve are in the lower working position under the action of the return spring, the left and right brakes are connected to the oil tank through F1 and F2, and the brake valve, and the brakes are in a pressure-released, non-braking state.

[0010] When bilateral braking is required, the left and right brake pedals are connected together via a mechanical lock. When the brake pedal is depressed, the pressure reducing valve opens, reducing the pressure oil P to the required pressure and delivering it to the left and right brake valves. Simultaneously, the left and right brake valves switch to the upper working position, delivering brake pressure oil to the brakes via F1 and F2. The brakes achieve bilateral braking under the action of the pressure oil.

[0011] When unilateral braking is required, the mechanical lock on the brake pedal is released, and the left brake pedal is depressed alone. Under the action of the left brake pedal, the pressure reducing valve and the left brake valve are reversed, and the brake pressure oil P acts on the left brake through the pressure reducing valve and the upper working position of the left brake valve, realizing unilateral braking on the left side; at this time, since the right brake pedal is not depressed, the right brake valve does not reverse and is still in the lower working position to release pressure, and unilateral braking on the right side is not performed; similarly, when the right brake pedal is depressed alone, unilateral braking on the right side can be achieved.

[0012] The utility model has a simple structure and a reasonable design, can realize free switching between unilateral braking and bilateral braking, can meet different braking pressure requirements, and is easy to use.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the interface b is connected to one end of the brake line L7, and the other end F1 of the brake line L7 is used to connect to the brake.

[0015] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the brake line L7 to supply oil to the brake to achieve braking.

[0016] Furthermore, the spring interface on one end of the left brake valve is connected to the brake pipeline L7 through a pipeline.

[0017] The beneficial effects of adopting the above further solution are simple structure and reasonable communication of the above pipelines, so that oil can enter the left brake valve to adjust the position of the valve core and unload the pressure of the spring chamber.

[0018] Furthermore, the interface e is connected to one end of the brake line L8, and the other end F2 of the brake line L8 is used to connect to the brake.

[0019] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the brake line L8 to supply oil to the brake to achieve braking.

[0020] Furthermore, the spring interface on one end of the right brake valve is connected to the brake pipeline L8 through a pipeline.

[0021] The beneficial effects of adopting the above further solution are simple structure and reasonable communication of the above pipelines, so that oil can enter the right brake valve to adjust the position of the valve core and unload the pressure of the spring chamber.

[0022] Furthermore, the pipeline L4 is connected to one end of the pressure monitoring pipeline L9, and the other end of the pressure monitoring pipeline L9 serves as a monitoring point MF.

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the monitoring point MF to connect the pressure sensor to facilitate pressure monitoring.

[0024] Furthermore, the spring interface on one end of the pressure reducing valve is connected to the pipeline L1 through the pipeline L10.

[0025] The beneficial effects of adopting the above further solution are simple structure, reasonable design, feedback of output pressure to the spring chamber of the pressure reducing valve through damping, and adjustment of the brake pedal force according to demand.

[0026] Furthermore, a throttle valve is fixedly installed on the pipeline L10.

[0027] The beneficial effects of adopting the above further solution are simple structure, reasonable design, feedback of output pressure to the spring chamber of the pressure reducing valve through damping, and adjustment of the brake pedal force according to demand.

[0028] Furthermore, the left brake valve and / or the right brake valve is a two-position three-way valve.

[0029] The beneficial effect of adopting the above further solution is that it is more reasonable to use two-position three-way valves for the left brake valve and the right brake valve, which has a simple structure, flexible control, various control methods and a wide range of applicability.

[0030] The utility model also relates to a tractor, comprising the hydraulic brake system capable of realizing decompression braking as described above.

[0031] The beneficial effect of adopting the above-mentioned further solution is that the utility model also provides a tractor with a simple structure and reasonable design, which can realize free switching between single-side braking and double-side braking, and can meet different braking pressure requirements, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the utility model when not braking;

[0034] Figure 3 This is a schematic diagram of the structure of the utility model during bilateral braking;

[0035] Figure 4 This is a schematic diagram of the structure of the left brake of the utility model during braking;

[0036] Figure 5 This is a schematic diagram of the structure of the right brake of the utility model during braking.

[0037] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0038] 1. Pressure reducing valve; 2. Left brake valve; 3. Right brake valve; 4. Throttle valve. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] Example 1

[0044] like Figures 1 to 5 As shown, this embodiment provides a hydraulic brake system capable of achieving pressure-reducing braking, comprising a left brake valve 2, a right brake valve 3, and a pressure-reducing valve 1. The pressure-reducing valve 1 is provided with an oil inlet g, an oil outlet h, and an oil return port i. The oil outlet h can be communicated with the oil inlet g or the oil return port i. The oil inlet g is communicated with one end of an oil inlet line L5, and the oil return port i is communicated with one end of an oil return line L6.

[0045] The left brake valve 2 is provided with a port a, a port b, and a port c, wherein the port b can be connected to the port a or the port c; the oil outlet h is connected to the port c via a pipeline L1, and the port a is connected to the oil return pipeline L6 via a pipeline L2;

[0046] The right brake valve 3 is provided with a port d, a port e and a port f, and the port e can be connected to the port d or the port f; the port d is connected to the port L2 through the pipeline L3, and the port f is connected to the pipeline L1 through the pipeline L4.

[0047] During normal driving, the brake pedal is not depressed, all valves are in the lower position, the oil source pressure oil acts on the P port, and the pressure reducing valve 1 is closed; the left brake valve 2 and the right brake valve 3 are in the lower working position under the action of the return spring, and the left and right brakes are connected to the oil tank through F1 and F2, as well as the brake valve, and the brakes are in a depressurized and non-braking state.

[0048] When bilateral braking is required, the left and right brake pedals are connected via a mechanical lock. When the brake pedal is depressed, pressure reducing valve 1 opens, reducing the pressure oil P to the required level and delivering it to left and right brake valves 2 and 3. Simultaneously, left and right brake valves 2 and 3 switch direction and are in the upper working position. Brake pressure oil is delivered to the brakes via F1 and F2, achieving bilateral braking under the action of the pressure oil.

[0049] When unilateral braking is required, the mechanical lock on the brake pedal is released, and the left brake pedal is depressed alone. Under the action of the left brake pedal, the pressure reducing valve 1 and the left brake valve 2 are reversed, and the brake pressure oil P acts on the left brake through the upper working position of the pressure reducing valve 1 and the left brake valve 2, realizing unilateral braking on the left side; at this time, since the right brake pedal is not depressed, the right brake valve 3 does not reverse and is still in the lower working position to release pressure, and unilateral braking on the right side is not performed; similarly, when the right brake pedal is depressed alone, unilateral braking on the right side can be achieved.

[0050] Typically, tractors have a brake on each axle. During normal operation, the left and right brake pedals are detachably connected by a mechanical structure, such as a pin. Pressing the brake pedals simultaneously applies brake pressure to both axles. To reduce the turning radius during field operations, the left and right pedal connections can be disconnected. Pressing either the left or right brake pedal allows for single-side braking to reduce the turning radius.

[0051] During bilateral braking, the two brake pedals are connected by a pin shaft. Stepping on one of the brake pedals can achieve synchronous operation of the two brake pedals, thus achieving bilateral braking. During unilateral braking, the pin shaft needs to be manually removed. At this time, when one of the brake pedals is stepped on, the other brake pedal does not operate, thus achieving unilateral braking.

[0052] This embodiment has a simple structure and a reasonable design, can realize free switching between unilateral braking and bilateral braking, can meet different braking pressure requirements, and is easy to use.

[0053] Example 2

[0054] On the basis of embodiment 1, in this embodiment, the interface b is communicated with one end of the brake line L7, and the other end F1 of the brake line L7 is used to communicate with the brake.

[0055] This solution has a simple structure and a reasonable design, and utilizes the brake line L7 to supply oil to the brake to achieve braking.

[0056] Example 3

[0057] On the basis of embodiment 2, in this embodiment, the spring interface on one end of the left brake valve 2 is connected to the brake pipeline L7 through a pipeline.

[0058] This solution has a simple structure and the above-mentioned pipelines are reasonably connected so that oil can enter the left brake valve to adjust the position of the valve core and unload the pressure of the spring chamber.

[0059] Example 4

[0060] On the basis of the above embodiments, in this embodiment, the interface e is communicated with one end of the brake line L8, and the other end F2 of the brake line L8 is used to communicate with the brake.

[0061] This solution has a simple structure and a reasonable design, and utilizes the brake line L8 to supply oil to the brake to achieve braking.

[0062] Example 5

[0063] On the basis of embodiment 4, in this embodiment, the spring interface on one end of the right brake valve 3 is connected to the brake pipeline L8 through a pipeline.

[0064] This solution has a simple structure and the above-mentioned pipelines are reasonably connected so that oil can enter the right brake valve to adjust the position of the valve core and unload the pressure of the spring chamber.

[0065] Example 6

[0066] On the basis of the above embodiments, in this embodiment, the pipeline L4 is connected to one end of the pressure monitoring pipeline L9, and the other end of the pressure monitoring pipeline L9 serves as the monitoring point MF.

[0067] The solution has a simple structure and reasonable design. It uses the monitoring point MF to connect the pressure sensor to facilitate pressure monitoring.

[0068] Example 7

[0069] On the basis of the above embodiments, in this embodiment, the spring interface on one end of the pressure reducing valve 1 is connected to the pipeline L1 through the pipeline L10.

[0070] This solution has a simple structure and reasonable design. The output pressure is fed back to the spring chamber of the pressure reducing valve through damping, and the brake pedal force can be adjusted according to demand.

[0071] Example 8

[0072] On the basis of Example 7, in this embodiment, a throttle valve 4 is fixedly installed on the pipeline L10.

[0073] This solution has a simple structure and reasonable design. The output pressure is fed back to the spring chamber of the pressure reducing valve through damping, and the brake pedal force can be adjusted according to demand.

[0074] Example 9

[0075] On the basis of the above embodiments, in this embodiment, the left brake valve 2 and / or the right brake valve 3 is a two-position three-way valve.

[0076] It is more reasonable to use two-position three-way valves for the left brake valve 2 and the right brake valve 3, which have simple structure, flexible control, various control modes and wide applicability.

[0077] Example 10

[0078] On the basis of the above embodiments, this embodiment further provides a tractor, comprising the hydraulic brake system capable of achieving decompression braking as described above.

[0079] This embodiment also provides a tractor with a simple structure and reasonable design. The tractor can realize free switching between single-side braking and double-side braking, and can meet different braking pressure requirements, and is easy to use.

[0080] The working principle of this utility model is as follows:

[0081] During normal driving, the brake pedal is not depressed, all valves are in the down position, the oil source pressure oil acts on the P port, and the pressure reducing valve 1 is closed; the left brake valve 2 and the right brake valve 3 are in the down working position under the action of the return spring, and the left and right brakes are connected to the oil tank through F1 and F2 and the brake valve, and the brake is in the pressure-released non-braking state (such as Figure 2 shown).

[0082] When bilateral braking is required, the left and right brake pedals are connected together through a mechanical lock. When the brake pedal is pressed, the pressure reducing valve 1 opens, reducing the pressure oil P to the required pressure and delivering it to the left brake valve 2 and the right brake valve 3. At the same time, the left brake valve 2 and the right brake valve 3 are switched to the upper working position, and the brake pressure oil is delivered to the brake through F1 and F2. The brake is braked under the action of the pressure oil (such as Figure 3 shown).

[0083] When unilateral braking is required, the mechanical lock on the brake pedal is released, and the left brake pedal is depressed alone. Under the action of the left brake pedal, the pressure reducing valve 1 and the left brake valve 2 are switched, and the brake pressure oil P acts on the left brake through the upper working position of the pressure reducing valve 1 and the left brake valve 2, realizing unilateral braking on the left side; at this time, since the right brake pedal is not depressed, the right brake valve 3 does not switch and is still in the lower working position to release pressure, and the right side is not braked (such as Figure 4 Similarly, when the right brake pedal is depressed alone, unilateral braking on the right side can be achieved (as shown in Figure 5 shown).

[0084] It should be noted that the bold lines in the accompanying drawings merely indicate the path of oil flow and have no other substantial meaning.

[0085] The advantages of this utility model are:

[0086] 1. Reduce the high pressure to the required braking pressure through the pressure reducing valve. By changing the pressure reducing valve structure, different braking pressure requirements can be achieved.

[0087] 2. The two brake valves are linked to the pressure reducing valve system respectively, which can realize free switching between unilateral braking and bilateral braking.

[0088] 3. The output pressure is fed back to the spring chamber of the pressure reducing valve through damping, and the brake pedal force can be adjusted according to demand.

[0089] 4. Output pressure monitoring can detect brake system problems in time to avoid safety accidents.

[0090] The innovative features of this utility model are as follows:

[0091] (1) Through the linkage of the pressure reducing valve and the control valve, pressure reducing braking is achieved, and the hydraulic output oil source can be used directly without setting up a separate oil source.

[0092] (2) Decompression braking principle: the braking pressure can be adjusted according to needs. The larger the braking pressure, the better the braking effect.

[0093] (3) The feedback pressure and brake pedal force can be adjusted as needed by adjusting the damping.

[0094] (4) Brake pressure monitoring: any problem with brake pressure will be promptly reported to avoid accidents and ensure the driver’s life safety.

[0095] As shown in the attached figure, the P port is the pressure oil supply port, which is connected to the oil source; F1 and F2 are the brake pressure output ports, which are connected to the brake; T port is the oil return port, which is connected to the oil tank; MF is the pressure sensor interface.

[0096] It should be noted that all the letters in the drawings merely represent relevant components, interfaces, oil ports or pipelines, and have no other substantial meanings.

[0097] Moreover, the frame lines on the outside of the entire system only integrate the internal structure into one and have no other substantial meaning.

[0098] In addition, all electronic components involved in the present invention adopt existing technologies, and the above components are electrically connected to the controller, and the control circuits between the controller and the components are existing technologies.

[0099] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0100] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic brake system capable of achieving decompression braking, characterized in that: The invention comprises a left brake valve (2), a right brake valve (3) and a pressure reducing valve (1), wherein the pressure reducing valve (1) is provided with an oil inlet g, an oil outlet h and an oil return port i, wherein the oil outlet h can be communicated with the oil inlet g or the oil return port i; the oil inlet g is communicated with one end of an oil inlet pipeline L5, and the oil return port i is communicated with one end of an oil return pipeline L6; The left brake valve (2) is provided with a port a, a port b and a port c, the port b being communicable with the port a or the port c; the oil outlet h being communicated with the port c via a pipeline L1, and the port a being communicated with the oil return pipeline L6 via a pipeline L2; The right brake valve (3) is provided with an interface d, an interface e and an interface f, wherein the interface e can be communicated with the interface d or the interface f; the interface d is communicated with the pipeline L2 via the pipeline L3, and the interface f is communicated with the pipeline L1 via the pipeline L4.

2. The hydraulic brake system capable of achieving decompression braking according to claim 1, characterized in that: The interface b is communicated with one end of the brake line L7, and the other end F1 of the brake line L7 is used to communicate with the brake.

3. The hydraulic brake system capable of achieving decompression braking according to claim 2, characterized in that: The spring interface on one end of the left brake valve (2) is communicated with the brake pipeline L7 through a pipeline.

4. The hydraulic brake system capable of achieving decompression braking according to claim 1, characterized in that: The interface e is communicated with one end of the brake line L8, and the other end F2 of the brake line L8 is used to communicate with the brake.

5. The hydraulic brake system capable of achieving decompression braking according to claim 4, characterized in that: The spring interface on one end of the right brake valve (3) is communicated with the brake pipeline L8 through a pipeline.

6. The hydraulic brake system capable of achieving pressure reduction braking according to any one of claims 1 to 5, characterized in that: The pipeline L4 is connected to one end of the pressure monitoring pipeline L9, and the other end of the pressure monitoring pipeline L9 serves as a monitoring point MF.

7. The hydraulic brake system capable of achieving pressure reduction braking according to any one of claims 1 to 5, characterized in that: The spring interface on one end of the pressure reducing valve (1) is connected to the pipeline L1 through the pipeline L10.

8. The hydraulic brake system capable of achieving decompression braking according to claim 7, characterized in that: A throttle valve (4) is fixedly installed on the pipeline L10.

9. The hydraulic brake system capable of achieving pressure reduction braking according to any one of claims 1 to 5, characterized in that: The left brake valve (2) and / or the right brake valve (3) are two-position three-way valves.

10. A tractor, characterized in that: The invention comprises a hydraulic brake system capable of achieving decompression braking as described in any one of claims 1 to 9.

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