Electro-hydraulic drive steering axle and electric engineering vehicle

Abstract

The utility model provides an electro-hydraulic drive steering axle and an electric engineering vehicle, which comprise an axle body, a steering pull rod and an independent electro-hydraulic drive system, and the output power of the electro-hydraulic drive system pushes or pulls a steering knuckle through the pull rod so as to drive wheels at the two ends of the axle body to steer; the electro-hydraulic driving system comprises a motor, a bidirectional plunger pump, a hydraulic oil tank, a double-acting oil cylinder and an integrated valve block; according to the electro-hydraulic drive steering axle, the steering axle is separated from a hydraulic system of the whole vehicle, in the walking process of the whole vehicle, the steering axle does not need to supply oil and control from the hydraulic system of the whole vehicle, the hydraulic system of the whole vehicle can reduce the power of a main pump of the whole vehicle or even shut down under the condition that no other actuator needs exist, overflow loss of the hydraulic system of the whole vehicle is reduced, and the service life of the whole vehicle is prolonged. And the purposes of energy conservation and emission reduction are achieved. Meanwhile, the corresponding steering speed and precision of the electro-hydraulic drive steering axle are not affected by a hydraulic system of the whole vehicle, and steering controllability of the engineering machinery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle steering systems, and more specifically, to an electro-hydraulic drive steering axle and an electric engineering vehicle. Background Art

[0002] The steering system is essential for wheeled construction machinery. Traditional construction machinery uses hydraulic cylinders as the transmission components of the steering mechanism, and the oil supply source uses the vehicle's hydraulic system for flow distribution to drive the steering cylinders. This centralized system configuration results in low system efficiency. When multiple actuators of the vehicle's hydraulic system perform combined actions, the operating conditions of each actuator are complex and different, causing large losses due to the coupling of multiple actuators and resulting in energy waste. Although a large amount of research has been carried out on energy-saving technologies for centralized systems in the prior art, their energy-saving effects are still very limited. The electrification of construction machinery provides new ideas for the research of new concepts for the transmission systems of construction machinery, making it possible to use a distributed system to solve the technical bottleneck of large losses in hydraulic systems. However, at present, there is no suitable steering axle for this system configuration in the distributed system of construction machinery. Summary of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide an electro-hydraulic drive steering axle and an electric engineering vehicle to solve the above problems.

[0004] The present utility model adopts the following solutions:

[0005] The present application provides an electro-hydraulic drive steering axle, which includes an axle body and a steering tie rod, and also includes an independent electro-hydraulic drive system. Its output power pushes or pulls the steering knuckle through the tie rod, thereby driving the wheels at both ends of the axle body to turn; the electro-hydraulic drive system includes a motor, a bi-directional piston pump, a hydraulic oil tank, a double-acting cylinder, and an integrated valve block;

[0006] The servo motor is used to drive the bi-directional piston pump to work, so that the bi-directional piston pump sucks oil from the hydraulic oil tank to build pressure, supplies oil to one chamber of the double-acting cylinder through the flow distribution of the integrated valve block, and then drives a piston rod of the bi-directional piston pump to move, thereby pushing the steering knuckle through the steering tie rod. The hydraulic oil in the other chamber of the double-acting cylinder is compressed and returned to the hydraulic oil tank, so that the other piston rod of the bi-directional piston pump retracts synchronously, thereby pulling the steering knuckle through the tie rod.

[0007] Further, a filter is provided on the integrated valve block.

[0008] Further, a cartridge-type overflow valve is provided on the integrated valve block.

[0009] Further, the bi-directional piston pump, the integrated valve block, and the hydraulic oil tank are connected through metal oil pipes.

[0010] Further, it also includes a cable junction box for electrically connecting the vehicle steering control system and the electro-hydraulic drive system.

[0011] The utility model also provides an electric engineering vehicle, including the electro-hydraulic drive steering axle, and steering wheels are movably connected to both ends of the axle body.

[0012] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0013] The electro-hydraulic drive steering axle realizes the separation of the steering axle and the vehicle's hydraulic system. During the vehicle's driving process, the steering axle does not need to be supplied with oil and controlled from the vehicle's hydraulic system. When there is no demand from other actuators in the vehicle's hydraulic system, the main pump power of the vehicle can be reduced or even shut down to reduce the overflow loss of the vehicle's hydraulic system, achieving the purpose of energy conservation and emission reduction. At the same time, the corresponding speed and accuracy of the electro-hydraulic drive steering axle for steering are not affected by the vehicle's hydraulic system, ensuring the steering controllability of construction machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of an electro-hydraulic drive steering axle according to an embodiment of the utility model;

[0016] Reference numerals: wheel 1, steering knuckle 2, axle body 3, piston rod 4, double-acting cylinder 5, metal oil pipe 6, cable junction box 7, motor 8, bi-directional piston pump 9, hydraulic oil tank 10, integrated valve block 11, filter 12, overflow valve 13, steering tie rod 14. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0018] Embodiment

[0019] Combined with Figure 1 As shown, this embodiment provides an electro-hydraulic drive steering axle, which includes a bridge body 3 and a steering tie rod 14, and also includes an independent electro-hydraulic drive system. Its output power drives or pulls the steering knuckle 2 through the tie rod, and then drives the wheels 1 at both ends of the bridge body 3 to turn; the electro-hydraulic drive system includes a motor 8, a bi-directional piston pump 9, a hydraulic oil tank 10, a double-acting cylinder 5, and an integrated valve block 11;

[0020] The motor 8 is used to drive the bi-directional piston pump 9 to work, so that the bi-directional piston pump 9 sucks oil from the hydraulic oil tank 10 to build pressure, and supplies oil to one cavity of the double-acting cylinder 5 through the distribution of the integrated valve block 11, and then drives a piston rod 4 of the bi-directional piston pump 9 to move, so as to push the steering knuckle 2 through the steering tie rod 14. The hydraulic oil in the other cavity of the double-acting cylinder 5 is compressed and returned to the hydraulic oil tank 10, so that the other piston rod 4 of the bi-directional piston pump 9 retracts synchronously, and then pulls the steering knuckle 2 through the tie rod.

[0021] This electro-hydraulic drive steering axle realizes the separation of the steering axle from the vehicle's hydraulic system. During the vehicle's driving process, the steering axle does not need to be supplied with oil and controlled from the vehicle's hydraulic system. When there is no demand for other actuators in the vehicle's hydraulic system, the main pump power of the vehicle can be reduced or even shut down to reduce the overflow loss of the vehicle's hydraulic system and achieve the purpose of energy conservation and emission reduction. At the same time, the corresponding speed and accuracy of the electro-hydraulic drive steering axle's steering are not affected by the vehicle's hydraulic system, ensuring the steering controllability of construction machinery.

[0022] Specifically, in this embodiment, as Figure 1As shown in the figure, the electro-hydraulic drive steering axle includes a bridge body 3, a steering tie rod 14, and an electro-hydraulic drive system. The electro-hydraulic drive system includes a motor 8, a bi-directional piston pump 9, a hydraulic oil tank 10, a double-acting cylinder 5, and an integrated valve block 11. The motor 8 is a servo motor and is connected to the bi-directional piston pump 9, and is used to drive the bi-directional piston pump 9 to work, so that the bi-directional piston pump 9 sucks oil from the hydraulic oil tank 10 through a metal oil pipe 6 to build pressure, and then supplies oil to one chamber of the double-acting cylinder 5 through the metal oil pipe 6 after passing through the flow distribution of the integrated valve block 11, thereby driving a piston rod 4 of the bi-directional piston pump 9 to move outwards, and then pushing the steering knuckle 2 through the steering tie rod 14. The hydraulic oil in the other chamber of the double-acting cylinder 5 is compressed and returns to the hydraulic oil tank 10 through the metal oil pipe 6, so that the other piston rod 4 of the bi-directional piston pump 9 retracts synchronously, and then pulls the steering knuckle 2 through the steering tie rod 14, realizing the synchronous rotation of the wheels 1 at both ends of the bridge body 3. The electro-hydraulic drive system also includes a cable junction box 7, which is convenient for electrically connecting the vehicle steering control system and the electro-hydraulic drive system.

[0023] Furthermore, a filter 12 is provided on the integrated valve block 11, which is used to filter the hydraulic oil to ensure the cleanliness of the oil in the electro-hydraulic drive system. An inserted overflow valve 13 is provided on the integrated valve block 11, which serves as a safety valve of the system and plays a safety protection function to avoid excessive pressure in the hydraulic system.

[0024] The present invention also provides an electric engineering vehicle, which includes the electro-hydraulic drive steering axle, and steering wheels 1 are movably connected to both ends of its bridge body 3.

[0025] By adopting the electro-hydraulic drive steering axle, the oil circuit that originally distributes the flow of the whole vehicle hydraulic system to the steering cylinder is cancelled. When the steering system is no longer combined with multiple actuators, the working conditions of each actuator are complex and different, resulting in large losses due to the coupling of multiple actuators. The distributed control of the whole vehicle hydraulic system and the steering system is realized, solving the problem of large losses in the traditional construction machinery hydraulic system and achieving the purpose of energy conservation and emission reduction; at the same time, the corresponding speed and accuracy of the steering of the steering axle are not affected by the whole vehicle hydraulic system, ensuring the steering controllability of the engineering vehicle.

[0026] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0029] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

Claims

1. An electro-hydraulic driven steering axle, comprising a bridge body and a steering tie rod, characterized in that: It also includes an independent electro-hydraulic drive system, whose output power drives the steering knuckle through the pull rod to drive the wheels at both ends of the bridge body to turn; the electro-hydraulic drive system includes a motor, a bidirectional plunger pump, a hydraulic oil tank, a double-acting cylinder, and an integrated valve block; The motor is used to drive the two-way piston pump to work, so that the two-way piston pump draws oil from the hydraulic oil tank to build up pressure, and supplies oil to a chamber of the double-acting cylinder through the distribution of the integrated valve block, thereby driving a piston rod of the two-way piston pump to move, thereby pushing the steering knuckle through the steering tie rod, and the hydraulic oil in the other chamber of the double-acting cylinder is compressed back into the hydraulic oil tank, so that the other piston rod of the two-way piston pump retracts synchronously, thereby pulling the steering knuckle through the tie rod.

2. The electro-hydraulic driven steering axle according to claim 1, characterized in that: The integrated valve block is provided with a filter.

3. The electro-hydraulic driven steering axle according to claim 2, characterized in that: The integrated valve block is provided with a plug-in overflow valve.

4. The electro-hydraulic driven steering axle according to claim 1, characterized in that: The bidirectional plunger pump, the integrated valve block and the hydraulic oil tank are connected through a metal oil pipe.

5. The electro-hydraulic driven steering axle according to claim 1, characterized in that: It also includes a cable junction box for electrically connecting the vehicle steering control system with the electro-hydraulic drive system.

6. An electric engineering vehicle, characterized in that: It comprises an electro-hydraulic driven steering axle as claimed in any one of claims 1 to 5, wherein steering wheels are movably connected at both ends of the axle body.

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