Oil pipe assembly and vehicle-mounted hydraulic steering system

Abstract

The utility model relates to an oil pipe assembly and a vehicle-mounted hydraulic steering system. Wherein the oil pipe assembly is used for conveying hydraulic oil of the vehicle-mounted hydraulic steering system; the first end of the high-pressure oil pipe is connected with a high-pressure oil outlet of the steering system, and the second end of the high-pressure oil pipe is connected with a steering oil pump; at least part of the high-pressure oil pipe is opposite to the engine fan; and the oil return pipe is used for connecting an oil return opening of the steering system and the steering oil tank, and at least part of the oil return pipe is opposite to the engine fan. According to the oil pipe assembly and the vehicle-mounted hydraulic steering system, the temperature of hydraulic oil in the hydraulic steering system can be reduced, the lubricating performance and the pumping efficiency of the system are guaranteed, the service life of the system is prolonged, and the stability of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of an oil pipe assembly and a vehicle-mounted hydraulic steering system, in particular to an oil pipe assembly and a vehicle-mounted hydraulic steering system. Background Art

[0002] The hydraulic steering system is one of the auxiliary driving systems of the car. When the driver turns the steering wheel, the steering power valve senses the steering input and adjusts the flow direction of the hydraulic oil accordingly, applying force to the hydraulic cylinder to assist in turning the wheels, so that the driver can easily control the direction of the vehicle with only a small amount of force. The hydraulic steering system usually includes components such as the steering power pump, hydraulic cylinder, steering power valve, hydraulic tank and hydraulic pipeline. The hydraulic oil is stored in the tank and transported to the steering power pump, hydraulic cylinder and steering power valve through pipelines.

[0003] During the operation of the hydraulic steering system, the friction between the various components and the friction when the hydraulic oil passes through pipes and valves under high pressure will cause heat. The heat will cause the temperature of the hydraulic oil to rise. Excessive hydraulic oil temperature will reduce the viscosity of the hydraulic oil, affecting the lubrication performance and pumping efficiency of the system. It will also cause problems such as heavy steering and abnormal noise in the system, affecting the service life and stability of the hydraulic steering system. Utility Model Content

[0004] Based on this, it is necessary to provide an oil pipe assembly and a vehicle-mounted hydraulic steering system that can alleviate the heating of hydraulic oil in order to solve the heating problem during the operation of the hydraulic steering system.

[0005] In a first aspect, an oil pipe assembly is provided, the oil pipe assembly being used for conveying hydraulic oil of a vehicle-mounted hydraulic steering system; comprising:

[0006] a high-pressure oil pipe, wherein a first end of the high-pressure oil pipe is connected to a high-pressure oil outlet of the steering system, and a second end of the high-pressure oil pipe is connected to a steering oil pump; at least a portion of the high-pressure oil pipe is arranged opposite to the engine fan;

[0007] An oil return pipe is used to connect the oil return port of the steering system and the steering oil tank, and at least a portion of the oil return pipe is arranged opposite to the engine fan.

[0008] In one embodiment, the high-pressure oil pipe includes a first high-pressure oil pipe section arranged opposite to the engine fan and a second high-pressure oil pipe section connected to the first high-pressure oil pipe section, and a first angle is formed between the first high-pressure oil pipe section and the second high-pressure oil pipe section, and the first angle is a right angle or an obtuse angle;

[0009] Or the oil return pipe includes a first oil return pipe section arranged opposite to the engine fan and a second oil return pipe section connected to the first oil return pipe section, and a second angle is formed between the first oil return pipe section and the second oil return pipe section, and the second angle is a right angle or an obtuse angle.

[0010] In one embodiment, the first angle and the second angle have a value range of 90°-120°.

[0011] In one embodiment, the high-pressure oil pipe is composed of multiple high-pressure oil pipe sections connected in sequence, and each of the high-pressure oil pipe sections is detachably connected; or the return oil pipe is composed of multiple return oil pipe sections connected in sequence, and each of the return oil pipe sections is detachably connected.

[0012] In one embodiment, each of the high-pressure oil pipe sections is detachably connected via a connecting piece, or each of the return oil pipe sections is detachably connected via a connecting piece, and the connecting piece includes a joint and a nut that cooperate with each other, the joint is arranged at the first end of the high-pressure oil pipe section, and the nut is arranged at the second end of the high-pressure oil pipe section; or the joint is arranged at the first end of the return oil pipe section, and the nut is arranged at the second end of the return oil pipe section.

[0013] In one embodiment, the joint is welded to the high-pressure oil pipe section or the oil return pipe section.

[0014] In one of the embodiments, the high-pressure oil pipe and the oil return pipe are fixedly connected to the vehicle frame via pipeline fixing parts respectively.

[0015] In one embodiment, the joint and the nut are made of steel; or the high-pressure oil pipe section or the return oil pipe section is made of steel.

[0016] In one embodiment, the first end of the high-pressure oil pipe and the second end of the high-pressure oil pipe are respectively located on both sides of the vehicle longitudinal beam, and the first end of the oil return pipe and the second end of the oil return pipe are respectively located on both sides of the vehicle longitudinal beam.

[0017] In a second aspect, a vehicle hydraulic steering system is provided, the steering system comprising an oil pipe assembly as described in the first aspect or any one of the embodiments of the first aspect, the oil pipe assembly being used for conveying hydraulic oil.

[0018] The above-mentioned oil pipe assembly and vehicle-mounted hydraulic steering system are achieved by connecting the first end of the high-pressure oil pipe to the high-pressure oil outlet of the steering system and the second end to the steering oil pump; at least a portion of the high-pressure oil pipe is arranged opposite to the engine fan; the return oil pipe is connected to the oil return port of the steering system and the steering oil tank, and at least a portion of the return oil pipe is arranged opposite to the engine fan, so that the hydraulic oil passing through the high-pressure oil pipe and the return oil pipe can achieve convection heat dissipation under the action of the engine fan, thereby reducing the temperature of the hydraulic oil in the hydraulic steering system, thereby ensuring the lubrication performance and pumping efficiency of the system, and improving the service life and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a structural schematic diagram of an oil pipe assembly and a hydraulic steering system in one embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the partial structure of an oil pipe assembly in one embodiment of the present application.

[0022] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the attached symbols are explained as follows:

[0023] 1: Steering gear; 2: Steering oil pump pipe; 3: Steering oil tank; 4: High-pressure oil pipe; 5: Oil return pipe; 6: High-pressure oil pipe fixing device; 7: Oil return pipe fixing device; 40: High-pressure oil pipe section; 41: First high-pressure oil pipe section; 42: Second high-pressure oil pipe section; 43: Joint; 44: Nut; 50: Oil return pipe section; 51: First oil return pipe section; 52: Second oil return pipe section. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] When the hydraulic steering system is operating, the friction between the components and the friction of the hydraulic oil under high pressure through pipes, valves and other locations will generate heat. This heat will cause the temperature of the hydraulic oil to rise, and excessively high hydraulic oil temperature will cause the viscosity of the hydraulic oil to decrease, thereby affecting the lubrication performance and pumping efficiency of the system. In addition, high temperature will also cause the steering operation to feel heavy and the system to have problems such as abnormal noise, which will have an adverse effect on the service life and stability of the hydraulic steering system. Based on the above problems, the present application provides an oil pipe assembly and a vehicle-mounted hydraulic steering system, which improves the heat dissipation effect of the hydraulic steering system by changing the layout of the oil pipe assembly. Figure 1 This is a structural schematic diagram of an oil pipe assembly and a hydraulic steering system in one embodiment of the present application; Figure 2 This is a partial structural diagram of an oil pipe assembly in one embodiment of the present application. Figure 1 and Figure 2 , an oil pipe assembly provided in an embodiment of the present application, the oil pipe assembly is used to transport hydraulic oil of a vehicle-mounted hydraulic steering system; comprising:

[0031] A high-pressure oil pipe 4, wherein a first end of the high-pressure oil pipe 4 is connected to a high-pressure oil outlet of the steering system, and a second end of the high-pressure oil pipe 4 is connected to the steering oil pump 2; at least a portion of the high-pressure oil pipe 4 is arranged opposite to the engine fan;

[0032] The oil return pipe 5 is used to connect the oil return port of the steering system and the steering oil tank 3. At least a portion of the oil return pipe 5 is arranged opposite to the engine fan.

[0033] Among them, the vehicle-mounted hydraulic steering system refers to a power steering system used in automobiles or other vehicles, which uses hydraulic pressure to assist or complete the steering operation of the vehicle, and may include components such as a hydraulic pump, a hydraulic cylinder, a steering valve, a high-pressure oil pipe 4, an oil return pipe 5, and a hydraulic oil tank. The high-pressure oil pipe 4 refers to a pipeline that sends the high-pressure liquid oil generated by the hydraulic pump to components such as the steering valve, hydraulic cylinder or booster. The hydraulic pump compresses the hydraulic oil and pushes it into the high-pressure oil pipe 4, so that it can provide sufficient pressure to drive other components of the steering system. The oil return pipe 5 is a pipeline that transports the used hydraulic oil in the hydraulic steering system back to the oil tank or hydraulic oil tank, so that the hydraulic oil can be sucked up by the hydraulic pump again and recycled. The engine fan refers to a fan used to dissipate heat from the vehicle engine. When the engine is running, the fan blades rotate, and the fan drives the air to flow through the engine to dissipate heat. The first end of the high-pressure oil pipe 4 is connected to the high-pressure oil outlet on the steering gear 1 of the steering system, and the second end is connected to the steering oil pump 2; at least part of the high-pressure oil pipe 4 is arranged opposite to the engine fan; the return oil pipe 5 connects the return oil port of the steering system and the steering oil tank 3, and at least part of the return oil pipe 5 is arranged opposite to the engine fan, so that the hydraulic oil passing through the high-pressure oil pipe 4 and the return oil pipe 5 can achieve convection heat dissipation under the action of the engine fan, reduce the temperature of the hydraulic oil in the hydraulic steering system, thereby ensuring the lubrication performance and pumping efficiency of the system, and improving the working life and stability of the system. The high-pressure oil pipe 4 and the return oil pipe 5 can both be composed of one pipeline, or can be composed of multiple pipe sections connected one by one. The materials of the high-pressure oil pipe section 40 and the return oil pipe section 50 can be the same or different. The high-pressure oil pipe 4 and the return oil pipe 5 are at least partially arranged opposite to the engine fan, which means that part or all of the high-pressure oil pipe 4 and the return oil pipe 5 are arranged at a position opposite to the engine fan. When the engine fan is running, the convection heat exchange between the high-pressure oil pipe 4 and the return oil pipe 5 and the air can be promoted, thereby reducing the temperature of the hydraulic oil in the pipeline.

[0034] The above-mentioned oil pipe assembly is achieved by connecting the first end of the high-pressure oil pipe 4 to the high-pressure oil outlet of the steering gear 1 of the steering system, and the second end to the steering oil pump 2; at least a portion of the high-pressure oil pipe 4 is arranged opposite to the engine fan; the return oil pipe 5 is connected to the oil return port of the steering system and the steering oil tank 3, and at least a portion of the return oil pipe 5 is arranged opposite to the engine fan, so that the hydraulic oil passing through the high-pressure oil pipe 4 and the return oil pipe 5 can achieve convection heat dissipation under the action of the engine fan, thereby reducing the temperature of the hydraulic oil in the hydraulic steering system, thereby ensuring the lubrication performance and pumping efficiency of the system, and improving the service life and stability of the system.

[0035] In one embodiment of the present application, the high-pressure oil pipe 4 includes a first high-pressure oil pipe section 41 arranged opposite to the engine fan and a second high-pressure oil pipe section 42 connected to the first high-pressure oil pipe section 41, and a first angle is formed between the first high-pressure oil pipe section 41 and the second high-pressure oil pipe section 42, and the first angle is a right angle or an obtuse angle; or the return oil pipe 5 includes a first return oil pipe section arranged opposite to the engine fan and a second return oil pipe section connected to the first return oil pipe section, and a second angle is formed between the first return oil pipe section and the second return oil pipe section, and the second angle is a right angle or an obtuse angle.

[0036] The first high-pressure oil pipe section 41 and the second high-pressure oil pipe section 42 can be formed by bending the high-pressure oil pipe 4 or the high-pressure oil pipe section 40. Figure 2 As shown, a section arranged opposite to the engine fan is the first high-pressure oil pipe section 41, and an adjacent section connected to the first high-pressure oil pipe section 41 but not arranged opposite to the engine fan is the second high-pressure oil pipe section 42. In the case where the high-pressure oil pipe 4 is formed by connecting multiple sections of pipe segments to each other, it can also be formed by connecting two sections of high-pressure oil pipe segments 40 through a connector, wherein one or more high-pressure oil pipe segments 40 arranged opposite to the engine constitute the first high-pressure oil pipe section 41, and one or more high-pressure oil pipe segments 40 connected to the first high-pressure oil pipe section 41 constitute the second high-pressure oil pipe section 42. In this case, the first high-pressure oil pipe section 41 and the second high-pressure oil pipe section 42 can be connected by connectors such as elbows. The high-pressure oil pipe 4 may include one or more first high-pressure oil pipe sections 41 and second high-pressure oil pipe sections 42, and the specific number is related to the actual pipeline layout and direction. Similarly, the structure and arrangement of the first oil return pipe section 51 and the second oil return pipe section 52 are similar to those of the first high-pressure oil pipe section 41 and the second high-pressure oil pipe section 42. The specific specifications and shapes of the high-pressure oil pipe 4 and the oil return pipe 5 can be set to be the same or different according to actual needs, and will not be repeated here. Setting the angle between the first high-pressure oil pipe section 41 and the second high-pressure oil pipe section 42 or the first oil return pipe section 51 and the second oil return pipe section 52 to an obtuse angle can reduce the pressure loss and energy consumption when the hydraulic oil flows to the curved part of the pipeline, and can make the oil pipe assembly such as Figure 1 As shown, the pipeline formed by the first high-pressure oil pipe section 41, the second high-pressure oil pipe section 42, the first return oil pipe section 51, and the second return oil pipe section 52 can span the frame longitudinal beam and be arranged under the engine cooling fan, or pass through the engine cooling fan, so that the middle part of the oil pipe assembly can reduce the temperature of the hydraulic oil in the oil pipe assembly under the action of natural wind or the engine fan during vehicle driving, thereby cooling the oil pipe assembly, preventing the steering system oil temperature from being too high, causing heavy steering, abnormal noise and other problems, and ensuring the working performance of the hydraulic steering system.

[0037] In one embodiment, the first angle and the second angle have a value range of 90°-120°. When the first angle and the second angle have a value range of the above values, the length of the oil pipe assembly can be moderate to meet the heat dissipation requirements. At the same time, the oil pipe assembly forms a rectangular or trapezoidal pipeline with a relatively regular shape, which can better adapt to the outer contour of the engine and is easy to manufacture and install.

[0038] In one embodiment, the high-pressure oil pipe 4 is composed of multiple high-pressure oil pipe sections 40 connected in sequence, and each high-pressure oil pipe section 40 is detachably connected; or the return oil pipe 5 is composed of multiple return oil pipe sections 50 connected in sequence, and each return oil pipe section 50 is detachably connected. Figure 1 and Figure 2 As shown, the high-pressure oil pipe 4 can be formed by connecting a plurality of high-pressure oil pipe sections 40 of different shapes in sequence, and the adjacent high-pressure oil pipe sections 40 can be detachably connected to facilitate maintenance and replacement.

[0039] In one embodiment, each high-pressure oil pipe section 40 is detachably connected by a connecting piece, or each return oil pipe section 50 is detachably connected by a connecting piece, and the connecting piece includes a joint 43 and a nut 44 that cooperate with each other, the joint 43 is arranged at the first end of the high-pressure oil pipe section 40, and the nut 44 is arranged at the second end of the high-pressure oil pipe section 40; or the joint 43 is arranged at the first end of the return oil pipe section 50, and the nut 44 is arranged at the second end of the return oil pipe section 50. An external thread is formed at the end of the joint 43, and the connection between the pipe sections is realized by the external thread cooperating with the internal thread of the nut 44.

[0040] In one embodiment, the joint 43 is welded to the high-pressure oil pipe section 40 or the return oil pipe section 50. The high-pressure oil pipe section 40 and the return oil pipe section 50 can be made of metal materials such as steel and titanium alloy, or can be made of materials such as rubber. When the high-pressure oil pipe section 40 or the return oil pipe section 50 is made of metal material, the joint can be integrated with the pipe section by welding to improve the convenience of installation and disassembly.

[0041] In one embodiment, the high-pressure oil pipe 4 and the oil return pipe 5 are respectively fixedly connected to the vehicle frame through pipeline fixing parts, wherein the pipeline fixing parts can be parts such as pipe clamps, hanging ears or supporting parts, and the specific specifications or structures of the fixing parts can be determined according to the specifications of the hydraulic steering system, the vehicle frame and the oil pipe assembly.

[0042] In one embodiment, the joint 43 and the nut 44 are made of steel; or the high-pressure oil pipe section 40 or the return oil pipe section 50 are made of steel. Steel has good pressure resistance and corrosion resistance and is suitable for making pipe fittings of hydraulic systems. Using steel to make pipe sections of hydraulic steering systems can improve the durability and safety of the system.

[0043] In one embodiment, the first end of the high-pressure oil pipe 4 and the second end of the high-pressure oil pipe 4 are respectively located on both sides of the vehicle longitudinal beam, and the first end of the return oil pipe 5 and the second end of the return oil pipe 5 are respectively located on both sides of the vehicle longitudinal beam. Different from the conventional oil pipe assembly being centrally arranged on one side of the longitudinal beam, when the two ends of the high-pressure oil pipe 4 and the return oil pipe 5 are respectively located on both sides of the vehicle longitudinal beam, the pipeline can be made longer, and the compactness of the layout is reduced, which is beneficial to the heat dissipation of the hydraulic oil in the pipeline.

[0044] Based on the same inventive concept, the embodiment of the present application also provides a vehicle-mounted hydraulic steering system including the oil pipe assembly involved above. The implementation scheme for solving the problem provided by the vehicle-mounted hydraulic steering system is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more vehicle-mounted hydraulic steering system embodiments provided below can refer to the above limitations on the oil pipe assembly, and will not be repeated here.

[0045] An embodiment of the present application provides a vehicle hydraulic steering system, the steering system comprising an oil pipe assembly as described in the above embodiments, and the oil pipe assembly is used to transport hydraulic oil.

[0046] In one embodiment, if Figure 1 and Figure 2 As shown, the oil pipe assembly includes a high-pressure oil pipe assembly composed of a plurality of high-pressure oil pipe sections 40 and a return oil pipe assembly composed of a plurality of return oil pipe sections 50, wherein the high-pressure oil pipe assembly and the return oil pipe assembly are respectively fixed on the frame by a high-pressure oil pipe fixing device 6 and a return oil pipe fixing device 7, to ensure the stability of the pipeline and reduce the influence of the vibration of the engine and the frame on the hydraulic system. The high-pressure oil pipe section may include a steel pipe and a rubber hose, and the return oil pipe section 50 may include a steel pipe and a rubber hose. The plurality of high-pressure oil pipe sections 40 and the return oil pipe section 50 are respectively connected one by one, and the rubber hose is connected by a buckle. The oil pipe assembly is used to connect the steering gear and the steering oil tank 3 of the vehicle, and its direction can be arranged around the length direction of the bottom of the engine, so that the oil pipe assembly can achieve heat dissipation of the oil pipe assembly through natural convection or forced convection under the action of the engine fan during the driving process of the vehicle. The longer the pipeline length, the larger the heat dissipation area and the better the heat dissipation effect. When the vehicle runs for a long time or under bad working conditions, the high-pressure oil pipe 4 and the return oil pipe 5 may be damaged. When maintenance is needed, the joint 43 and the nut 44 can be loosened, and each high-pressure oil pipe section 40 can be replaced or inspected and repaired respectively, and then reinstalled through the joint 43 and the nut 44 and other connectors. The same is true for the return oil pipe section 50 that needs to be repaired and replaced. The utility model arranges the oil pipe assembly under the engine, avoiding the problem of limited layout space above the vehicle frame and limiting the length of the oil pipe assembly and heat dissipation. The high-pressure oil pipe 4 and the return oil pipe 5 are formed by multiple pipe sections connected to each other by connectors, which can make the maintenance and repair process more convenient.

[0047] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A tubing assembly, characterized in that: The oil pipe assembly is used to transport hydraulic oil of a vehicle-mounted hydraulic steering system; it includes: a high-pressure oil pipe, wherein a first end of the high-pressure oil pipe is connected to a high-pressure oil outlet of the steering system, and a second end of the high-pressure oil pipe is connected to a steering oil pump; at least a portion of the high-pressure oil pipe is arranged opposite to the engine fan; An oil return pipe is used to connect the oil return port of the steering system and the steering oil tank, and at least a portion of the oil return pipe is arranged opposite to the engine fan.

2. The oil pipe assembly according to claim 1, characterized in that: The high-pressure oil pipe comprises a first high-pressure oil pipe section arranged opposite to the engine fan and a second high-pressure oil pipe section connected to the first high-pressure oil pipe section, a first angle is formed between the first high-pressure oil pipe section and the second high-pressure oil pipe section, and the first angle is a right angle or an obtuse angle; Or the oil return pipe includes a first oil return pipe section arranged opposite to the engine fan and a second oil return pipe section connected to the first oil return pipe section, and a second angle is formed between the first oil return pipe section and the second oil return pipe section, and the second angle is a right angle or an obtuse angle.

3. The oil pipe assembly according to claim 2, characterized in that: The first angle and the second angle have a value range of 90°-120°.

4. The oil pipe assembly according to claim 1, characterized in that: The high-pressure oil pipe is composed of a plurality of high-pressure oil pipe sections connected in sequence, and each of the high-pressure oil pipe sections is detachably connected; Or the oil return pipe is composed of a plurality of oil return pipe sections connected in sequence, and each of the oil return pipe sections is detachably connected.

5. The oil pipe assembly according to claim 4, characterized in that: Each of the high-pressure oil pipe sections is detachably connected via a connecting piece, or each of the return oil pipe sections is detachably connected via a connecting piece, and the connecting piece includes a joint and a nut that cooperate with each other, the joint is arranged at the first end of the high-pressure oil pipe section, and the nut is arranged at the second end of the high-pressure oil pipe section; or the joint is arranged at the first end of the return oil pipe section, and the nut is arranged at the second end of the return oil pipe section.

6. The oil pipe assembly according to claim 5, characterized in that: The joint is welded to the high-pressure oil pipe section or the oil return pipe section.

7. The oil pipe assembly according to claim 1, characterized in that: The high-pressure oil pipe and the oil return pipe are fixedly connected to the vehicle frame through pipeline fixing parts respectively.

8. The oil pipe assembly according to claim 6, characterized in that: The joint and the nut are made of steel; Or the manufacturing material of the high-pressure oil pipe section or the return oil pipe section includes steel.

9. The oil pipe assembly according to claim 1, characterized in that: The first end of the high-pressure oil pipe and the second end of the high-pressure oil pipe are respectively located on both sides of the vehicle longitudinal beam, and the first end of the oil return pipe and the second end of the oil return pipe are respectively located on both sides of the vehicle longitudinal beam.

10. A vehicle-mounted hydraulic steering system, characterized in that: The steering system comprises an oil pipe assembly as claimed in any one of claims 1 to 9, wherein the oil pipe assembly is used for conveying hydraulic oil.

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