Hydraulic system for energy recovery and vehicle

Abstract

The utility model relates to the technical field of hydraulic systems of vehicles, in particular to a hydraulic system for energy recovery and a vehicle, and the hydraulic system for energy recovery comprises an oil tank, a hydraulic cylinder and a hydraulic cylinder, the gear pump is communicated with the oil tank; the steering gear is communicated with the gear pump, and the steering gear comprises a priority valve; and the energy conversion branch is communicated with the priority valve and the oil tank, and the energy conversion branch is provided with an energy conversion device. The hydraulic system for energy recovery and the vehicle can solve the problem that an existing constant displacement pump steering system is high in energy loss.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle hydraulic systems, and in particular to a hydraulic system and vehicle for energy recovery. Background Art

[0002] The hydraulic system is a vital component of a vehicle, playing a key role in normal driving and various operations. Furthermore, it plays an indispensable role in the operation of mechanical equipment. For example, the hydraulic system can be used for the vehicle's overall steering, meeting the requirements of mechanical steering, reducing operating force, and lowering the driver's workload.

[0003] Hydraulic systems typically consist of components such as pumps, valves, and cylinders. Currently, most harvesting machinery uses fixed-flow pumps. However, during operation, these pumps often fail to accurately match the flow rate required by the load, resulting in overflow losses that affect fuel economy and hydraulic oil temperature. This condition is not only detrimental to environmental protection but also shortens the life of the hydraulic oil, further impacting the reliability of the entire hydraulic system and the performance of its components. While variable-flow pumps theoretically avoid these issues, their high cost and susceptibility to contamination limit their widespread adoption.

[0004] To ensure smooth steering even at idle, the commonly used fixed-flow pump steering system typically matches the steering gear to the flow rate required at idle. However, when the engine is under high load, excess flow will flow directly back into the fuel tank or partially back through the relief valve, causing heat loss and energy waste. Furthermore, when the vehicle is not steering, the pump output flow will also completely return to the fuel tank, resulting in unnecessary energy loss. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a hydraulic system and a vehicle for energy recovery, so as to solve the problem of high energy loss in the existing fixed displacement pump steering system.

[0006] According to the first aspect of the present utility model, a hydraulic system for energy recovery is provided, wherein the hydraulic system for energy recovery includes: an oil tank; a gear pump connected to the oil tank; a steering gear connected to the gear pump, the steering gear including a priority valve; and an energy conversion branch connecting the priority valve and the oil tank, the energy conversion branch being provided with an energy conversion device.

[0007] Preferably, the energy conversion branch further includes an energy storage device, and the energy storage device is conductively connected to the energy conversion device.

[0008] Preferably, the energy conversion device is a hydraulic generator.

[0009] Preferably, the energy storage device is a power supply.

[0010] Preferably, the steering gear is connected to the oil cylinder, and the steering gear further includes a three-position seven-way reversing valve, the priority valve is connected to the three-position seven-way reversing valve, and the three-position seven-way reversing valve is connected to the oil cylinder.

[0011] Preferably, the steering gear includes an oil inlet and a working oil port, the oil inlet is connected to the priority valve, the priority valve is connected to the working oil port, and the working oil port is connected to the energy conversion branch.

[0012] Preferably, the steering gear further includes a first connecting port and a second connecting port, the three-position seven-way reversing valve is connected to the first connecting port and the second connecting port, and the first connecting port and the second connecting port are respectively connected to the rod chamber and the rodless chamber of the oil cylinder.

[0013] Preferably, the priority valve preferentially provides flow to the three-position seven-way reversing valve, and when the speed of the gear pump continues to increase or the steering gear does not turn, the priority valve supplies oil to the energy conversion branch.

[0014] Preferably, the displacement of the gear pump is set to at least meet the steering demand at the lowest speed of the engine of the vehicle.

[0015] According to a second aspect of the present invention, a vehicle is provided, wherein the vehicle includes the hydraulic system for energy recovery as described above.

[0016] The hydraulic system and vehicle for energy recovery in the embodiment of the utility model have a gear pump connected to the fuel tank. The steering gear is connected to the gear pump, and the steering gear includes a priority valve. The energy conversion branch connects the priority valve and the fuel tank, and the energy conversion branch is provided with an energy conversion device. With this arrangement, when the engine is above idle speed or not steering, part of the flow provided by the gear pump flows into the energy conversion branch through the priority valve, the kinetic energy of the hydraulic oil is converted into electrical energy through the energy conversion device, and finally the hydraulic oil flows back to the fuel tank. This can effectively solve the problem of high energy loss in existing quantitative pump steering systems.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of a hydraulic system for energy recovery according to the utility model.

[0020] Figure markings: 1-oil tank; 2-gear pump; 3-steering gear; 30-priority valve; 31-three-position seven-way reversing valve; 301-oil inlet; 302-working oil port; 303-first connecting port; 304-second connecting port; 4-oil cylinder; 5-energy conversion branch; 51-energy conversion device; 52-energy storage device. DETAILED DESCRIPTION

[0021] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0022] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0023] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0024] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0025] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0026] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0027] The terms used herein are intended to describe various examples only and are not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form. The terms "include," "comprising," and "having" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0028] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0029] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0030] like Figure 1 As shown, according to a first aspect of the present utility model, a hydraulic system for energy recovery is provided, which includes an oil tank 1, a gear pump 2, a steering gear 3, an oil cylinder 4 and an energy conversion branch 5.

[0031] In the following description, reference will be made to Figure 1 The specific structures of the above components of the hydraulic system for energy recovery and the connection relationships of the above components are described in detail.

[0032] like Figure 1 As shown, in an embodiment, the gear pump 2 can be connected to the oil tank 1. The steering gear 3 can be connected to the gear pump 2. The steering gear 3 can include a priority valve 30. The energy conversion branch 5 can connect the priority valve 30 and the oil tank 1. The energy conversion branch 5 can be provided with an energy conversion device 51. With such a configuration, when the engine is above idle speed or not steering, the flow provided by the gear pump 2 can partially flow into the energy conversion branch 5 through the priority valve 30, and the kinetic energy of the hydraulic oil is converted into electrical energy through the energy conversion device 51, thereby reducing energy loss and achieving energy recovery.

[0033] Preferably, Figure 1 As shown, in an embodiment, the energy conversion branch 5 may further include an energy storage device 52. The energy storage device 52 may be electrically connected to the energy conversion device 51 to store the energy recovered by the energy conversion device 51.

[0034] Further, preferably, Figure 1 As shown, in this embodiment, the energy conversion device 51 may be a hydraulic generator. When the hydraulic oil flows through the energy conversion branch 5, the kinetic energy of the hydraulic oil is converted into electrical energy by the hydraulic generator, and the hydraulic oil then flows back to the oil tank 1. Furthermore, the energy storage device 52 may preferably be a power source. After the kinetic energy of the hydraulic oil is converted into electrical energy by the hydraulic generator, the electrical energy is transferred to the power source for storage. Specifically, the power source may be a battery, which may be electrically connected to the hydraulic generator.

[0035] Preferably, Figure 1 As shown, in this embodiment, the oil cylinder 4 can be connected to the steering gear 3. The steering gear 3 can include a 3 / 7-way reversing valve 31 and a priority valve 30. The priority valve 30 is connected to the 3 / 7-way reversing valve 31 via a pipeline. The priority valve 30 can preferentially provide flow to the 3 / 7-way reversing valve 31. The 3 / 7-way reversing valve 31 is then connected to the oil cylinder 4 to provide oil to the oil cylinder 4. Specifically, the oil cylinder 4 can be the vehicle's steering oil cylinder.

[0036] Preferably, Figure 1As shown, in an embodiment, the steering gear 3 may include an oil inlet 301 and a working oil port 302. The oil inlet 301 may be connected to the priority valve 30, that is, the hydraulic oil provided by the gear pump 2 first passes through the priority valve 30. The priority valve 30 may be connected to the working oil port 302 (that is, the working oil port 302 is connected to the EF oil port of the priority valve 30, or the working oil port 302 is the EF oil port of the priority valve 30). The working oil port 302 is connected to the energy conversion branch 5, so that when the speed of the gear pump 2 continues to increase or the steering gear 3 is not steering, the priority valve 30 can supply oil to the energy conversion branch 5.

[0037] Furthermore, in an embodiment, the displacement of the gear pump 2 can be preferably set to at least meet steering requirements at the vehicle's lowest engine speed. When the vehicle does not require steering, all hydraulic oil output by the gear pump 2 is returned through the priority valve 30, and the kinetic energy of the hydraulic oil is recovered and stored via the energy conversion branch 5. Because the entire machine operates above idle speed most of the time, the working oil port 302 maintains a continuous flow output, ensuring continuous energy conversion by the hydraulic generator and storage in the energy storage device 52.

[0038] In addition, preferably, Figure 1 As shown, in this embodiment, the steering gear 3 may further include a first connection port 303 and a second connection port 304. Specifically, the three-position, seven-way reversing valve 31 may be connected to the first connection port 303 and the second connection port 304 via a pipeline. The first connection port 303 and the second connection port 304 may be connected to the rod chamber and the rodless chamber of the oil cylinder 4, respectively, via pipelines.

[0039] In addition, if Figure 1 As shown, according to a second aspect of the present invention, a vehicle is provided, which includes the hydraulic system for energy recovery as described above.

[0040] During operation, when the vehicle is started, gear pump 2 begins to rotate. The flow provided by gear pump 2 is preferentially provided to three-position, seven-way reversing valve 31 via priority valve 30, thereby rotating steering gear 3 and allowing hydraulic oil to enter cylinder 4, thereby achieving vehicle steering. If the speed of gear pump 2 continues to increase or if steering gear 3 does not steer, excess hydraulic oil will flow through working oil port 302 of priority valve 30, pass through energy conversion device 51, and convert the kinetic energy of the hydraulic oil into electrical energy, which is then stored in energy storage device 52, thereby achieving energy recovery.

[0041] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A hydraulic system for energy recovery, provided in a vehicle, characterized in that: The hydraulic system for energy recovery includes: tank; a gear pump connected to the oil tank; a steering gear connected to the gear pump, the steering gear including a priority valve; and The energy conversion branch is connected with the priority valve and the oil tank, and the energy conversion branch is provided with an energy conversion device.

2. The hydraulic system for energy recovery according to claim 1, characterized in that: The energy conversion branch further includes an energy storage device, which is conductively connected to the energy conversion device.

3. The hydraulic system for energy recovery according to claim 2, characterized in that: The energy conversion device is a hydraulic generator.

4. The hydraulic system for energy recovery according to claim 3, characterized in that: The energy storage device is a power source.

5. The hydraulic system for energy recovery according to claim 1, characterized in that: The steering gear is connected to the oil cylinder, and the steering gear further includes a three-position seven-way reversing valve. The priority valve is connected to the three-position seven-way reversing valve, and the three-position seven-way reversing valve is connected to the oil cylinder.

6. The hydraulic system for energy recovery according to claim 5, characterized in that: The steering gear includes an oil inlet and a working oil port, the oil inlet is connected to the priority valve, the priority valve is connected to the working oil port, and the working oil port is connected to the energy conversion branch.

7. The hydraulic system for energy recovery according to claim 6, characterized in that: The steering gear also includes a first connecting port and a second connecting port. The three-position seven-way reversing valve is connected to the first connecting port and the second connecting port. The first connecting port and the second connecting port are respectively connected to the rod chamber and the rodless chamber of the oil cylinder.

8. The hydraulic system for energy recovery according to any one of claims 5 to 7, characterized in that: The priority valve preferentially provides flow to the three-position seven-way reversing valve. When the speed of the gear pump continues to increase or the steering gear does not perform steering, the priority valve supplies oil to the energy conversion branch.

9. The hydraulic system for energy recovery according to claim 1, characterized in that: The displacement of the gear pump is set to at least meet the steering demand at the lowest speed of the engine of the vehicle.

10. A vehicle, characterized in that: The vehicle includes the hydraulic system for energy recovery according to any one of claims 1 to 9.

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