Engineering vehicle and emergency steering system of power-off trailer of engineering vehicle

Abstract

The utility model discloses an engineering vehicle and an emergency steering system of a power-off trailer thereof, a mechanical pump is connected with a gearbox and an oil tank, and the gearbox operates to drive the mechanical pump to output pressure oil; the prefill valve is connected with the mechanical pump and the energy accumulator, and pressure oil output by the mechanical pump is stored in the energy accumulator through the prefill valve; the prefill valve is connected with the oil tank, and when the pressure of the energy accumulator exceeds a threshold value, pressure oil from the mechanical pump is unloaded to the oil tank; the selector valve is connected with the mechanical pump and the energy accumulator and is used for selecting a larger pressure value from the energy accumulator and the mechanical pump for emergency steering; the electromagnetic directional valve is connected with the steering gear, the selector valve and the gear pump; when the vehicle is powered on, a gear pump and a steering gear oil way are connected; and when the vehicle is in a power-off state, the selector valve and the steering gear oil way are connected. The emergency steering function of the whole machine in the power-off state is achieved, and the steering safety of the whole machine in the power-off state is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an emergency steering system of an engineering vehicle power-off trailer and belongs to the technical field of engineering vehicles. BACKGROUND

[0002] Wheel excavators often face various complex working environments during construction, especially when working in the wild. Vehicle power failure may occur due to various reasons. Once the power is off, the traditional hydraulic steering system will lose the power source and cannot work normally, which poses a great safety hazard. Therefore, it is particularly important to design an emergency steering system that can still work normally after power failure.

[0003] As shown in Figure 1 The existing steering system structure is as follows: steering wheel 1, gear pump 2, steering gear 3, steering cylinder 4, oil tank 5.

[0004] When steering is needed, the steering wheel 1 drives the steering gear 3 valve core to rotate, the oil path between the valve core and the valve sleeve is opened, the high-pressure oil output by the gear pump 2 enters the drive axle steering cylinder 4 oil cavity through the steering gear 3, and the oil in the steering cylinder 4 return cavity returns to the oil tank 6, realizing the steering function.

[0005] Other emergency steering solutions for engineering machinery are as follows:

[0006] CN 106494500 B uses vehicle inertia to drive the motor, and then drives the steering cylinder. When the engine power is interrupted, the motor is cut off and the vehicle stops in a very short time. This system will lose the auxiliary power source. Moreover, when the vehicle is powered off, the steering function cannot be realized.

[0007] CN 111776066 A realizes steering power supply through an accumulator, a control valve and a pressure sensor when the vehicle is powered off and the steering fails. However, the accumulator has limited energy and can only provide limited steering function.

[0008] CN 104742964 A patent uses the working condition that the engine does not fail and the gear pump fails to provide steering pressure. When the vehicle is powered off, the steering function cannot be realized.

[0009] CN 110091916 B realizes steering function when the main steering pump fails through an emergency steering pump and an emergency steering valve, but the source of hydraulic power for the emergency steering pump is not described.

[0010] CN113682371A realizes emergency steering by installing an accumulator. The power is obtained from the transmission through an electromagnetic brake and an electromagnetic clutch. If the electromagnetic brake and the electromagnetic clutch are simultaneously combined or disconnected, there is no power output. Therefore, this scheme cannot work in the power-off state of the whole machine.

[0011] CN109334759B is to solve the problem of small steering flow, change the steering variable pump to the steering constant pump, and combine the excess flow of the steering constant pump with the self-unloading lifting.

[0012] From the above, once the whole machine is powered off due to failure, the hydraulic steering system will lose power source and cannot steer normally. The safety hidden danger during towing is great. SUMMARY

[0013] According to the deficiencies existing in the prior art, the utility model provides an emergency steering system for engineering vehicle power failure towing, which utilizes towing kinetic energy, designs a mechanical pump to output pressure oil, and stores the pressure oil in an accumulator for emergency steering and towing steering occasions.

[0014] The utility model realizes the following technical scheme:

[0015] In the first aspect, the utility model provides an emergency steering system for engineering vehicle power failure towing, which comprises an oil tank, a steering gear, a steering wheel, a gear pump, a steering cylinder, a mechanical pump, a gearbox, a liquid filling valve, an accumulator, a selector valve and an electromagnetic reversing valve. The mechanical pump is connected to the gearbox and the oil tank, and the operation of the gearbox drives the mechanical pump to output pressure oil. The liquid filling valve is connected to the mechanical pump and the accumulator, and the pressure oil output by the mechanical pump is stored in the accumulator through the liquid filling valve. The liquid filling valve is also connected to the oil tank, and when the pressure of the accumulator exceeds the threshold value, the pressure oil from the mechanical pump is discharged to the oil tank. The selector valve is connected to the mechanical pump and the accumulator, and is used to select the larger pressure value from the accumulator and the mechanical pump for emergency steering. The electromagnetic reversing valve is connected to the steering gear, the selector valve and the gear pump. When the vehicle is powered on, the gear pump and the steering gear oil circuit are connected. When the vehicle is powered off, the selector valve and the steering gear oil circuit are connected.

[0016] In some embodiments, the valve core of the steering gear and the steering wheel are connected through a spline.

[0017] In some embodiments, the mechanical pump is connected to the output flange of the gearbox, so that the two can rotate synchronously.

[0018] In some embodiments, the oil inlet cavity of the steering cylinder is connected to the steering gear, the oil return cavity of the steering cylinder is connected to the electromagnetic reversing valve, and the electromagnetic reversing valve is connected to the oil tank.

[0019] In the second aspect, the utility model provides an engineering vehicle comprising the above-mentioned emergency steering system for engineering vehicle power failure towing.

[0020] In some embodiments, the engineering vehicle is a wheeled vehicle.

[0021] In some embodiments, the wheeled vehicle is a wheeled excavator.

[0022] The utility model discloses beneficial effect:

[0023] The utility model provides a kind of emergency steering system of engineering vehicle power-off trailer, realize whole machine power-off state emergency steering function, improve the steering safety under whole machine power-off state. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute undue limitation on the utility model. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained according to these drawings without creative labor for ordinary skilled in the art.

[0025] In the drawings:

[0026] Figure 1 It is the steering system schematic diagram of prior art;

[0027] Figure 2 It is the emergency steering system schematic diagram of engineering vehicle power-off trailer of the utility model Figure 1 (Vehicle power-on state steering function is realized);

[0028] Figure 3 It is the emergency steering system schematic diagram of engineering vehicle power-off trailer of the utility model Figure 2 (Vehicle power-off state steering function is realized).

[0029] Drawing mark: 1 steering wheel, 2 gear pump, 3 steering gear, 4 steering oil cylinder, 5 oil tank, 6 mechanical pump, 7 gearbox, 8 liquid filling valve, 9 accumulator, 10 electromagnetic reversing valve, 11 selector valve.

[0030] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the utility model in any way, but to illustrate the concept of the utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be described clearly and completely in the following by combining the drawings in the embodiments of the utility model, and the following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figure 2 , Figure 3 As shown, this utility model provides an emergency steering system for a power-off trailer of an engineering vehicle, including a steering wheel 1, a gear pump 2, a steering gear 3, a steering cylinder 4, an oil tank 5, a mechanical pump 6, a gearbox 7, a filling valve 8, an accumulator 9, an electromagnetic reversing valve 10, and a selector valve 11.

[0034] The valve core of steering wheel 1 and steering gear 3 are connected by a spline.

[0035] Mechanical pump 6 is connected to the output flange of gearbox 7. When the gearbox is running, it drives the mechanical pump to output pressurized oil.

[0036] The mechanical pump 6 receives its oil from the oil tank 5, and the output pressurized oil is stored in the accumulator 9 through the filling valve 8.

[0037] The electromagnetic directional valve 11 is located before the steering gear 3 and is used to control the switching of the hydraulic circuit when the vehicle is powered on and off. When the vehicle is powered on, the armature actuates, connecting the hydraulic circuit of the gear pump 2 and the steering gear 3. When the vehicle is de-energized, the spring actuates, connecting the selector valve 11 and the hydraulic circuit of the steering gear 3.

[0038] The filling valve 8 is connected to the mechanical pump 6 and the accumulator 9, and is located before the solenoid directional valve 10. When the pressure in the accumulator 9 exceeds the threshold, the pressurized oil from the mechanical pump 6 is unloaded into the oil tank 5.

[0039] Selector valve 11 is used to select the larger pressure value from accumulator 9 and mechanical pump 6 for emergency steering.

[0040] The following describes the working process of the emergency steering system of the aforementioned engineering vehicle power failure trailer.

[0041] like Figure 2 As shown, when the vehicle is powered on: the solenoid directional valve 10 is energized, the steering wheel 1 drives the valve core of the steering gear 3 to rotate, the oil passage between the valve core and the valve sleeve is opened, and the high-pressure oil output by the gear pump 2 enters the oil inlet chamber of the steering cylinder 4 of the drive axle through the steering gear 3. The oil in the return chamber of the steering cylinder 4 returns to the oil tank 5, realizing the steering function. At this time, the pressure oil output by the mechanical pump 6 goes to the accumulator 9 or the oil tank 5 through the filling valve 9 (based on the comparison between the filling pressure and the accumulator threshold).

[0042] likeFigure 3 As shown, the vehicle is powered off and the trailer is towed: the vehicle is powered off, the electromagnetic reversing valve 10 is powered off, the spring is in action, and the oil passage between the selector valve and the steering gear is connected. During the towing process, the wheel drive gearbox is running, and the mechanical pump 6 outputs pressure oil which is stored in the accumulator 9 through the charging valve 8. When steering, the steering wheel 1 drives the valve core of the steering gear 3 to rotate, and the oil passage between the valve core and the valve sleeve is opened. The selector valve 11 compares and outputs the larger one of the accumulator 9 oil pressure P2 and the mechanical pump 6 output pressure PI to the steering gear 3. The high-pressure oil enters the driving axle steering cylinder 4 oil cavity, and the oil in the steering cylinder 4 return cavity returns to the oil tank 5 through the steering gear 3 and the electromagnetic reversing valve 11, thereby realizing the steering function. During the towing process, when the accumulator 9 pressure reaches the threshold value, the charging valve unloads protection, and the oil directly returns to the oil tank 5.

[0043] In summary, the utility model provides an emergency steering system of an engineering vehicle powered-off towing, realizes emergency steering in power-off and towing with normal steering function, and improves the safety performance of the whole machine.

[0044] The engineering vehicle provided by the utility model is described below, and the engineering vehicle described below can be correspondingly referred to the emergency steering system of the engineering vehicle powered-off towing described above.

[0045] The engineering vehicle provided by the utility model can include the emergency steering system of the engineering vehicle powered-off towing as described in any one of the above embodiments.

[0046] The beneficial effects achieved by the engineering vehicle provided by the utility model are consistent with the beneficial effects achieved by the emergency steering system of the engineering vehicle powered-off towing provided by the utility model, and thus will not be described here.

[0047] It should be noted that the above engineering vehicle can be a wheel excavator.

[0048] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0049] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments but not others, combinations of features of different embodiments also mean to be within the protection scope of the utility model and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0050] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make minor changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the present application.

Claims

1. An emergency steering system for a disabled towed vehicle of an engineering vehicle comprising a tank, a steering gear, a steering wheel, a gear pump and a steering cylinder; characterized in that, Also includes: The mechanical pump is connected to the gearbox and the oil tank. The operation of the gearbox drives the mechanical pump to output pressurized oil. The filling valve connects the mechanical pump and the accumulator. The pressure oil output by the mechanical pump is stored in the accumulator through the filling valve. The filling valve is also connected to the oil tank. When the pressure of the accumulator exceeds the threshold, the pressure oil from the mechanical pump is unloaded to the oil tank. The selector valve connects the mechanical pump and the accumulator, and is used to select the larger pressure value from the accumulator and the mechanical pump for emergency steering. The electromagnetic directional valve connects the steering gear, selector valve, and gear pump; when the vehicle is powered on, it connects the gear pump and steering gear hydraulic circuit; when the vehicle is de-powered, it connects the selector valve and steering gear hydraulic circuit.

2. An emergency steering system for a disabled vehicle towed by an engineering vehicle according to claim 1, characterized in that: The steering wheel and the valve core of the steering gear are connected by a spline.

3. An emergency steering system for a disabled vehicle towed by an engineering vehicle according to claim 1, characterized in that: The mechanical pump is connected to the output flange of the gearbox, enabling the two to rotate synchronously.

4. An emergency steering system for a disabled vehicle towed by an engineering vehicle according to claim 1, characterized in that: The oil inlet chamber of the steering cylinder is connected to the steering gear, and the oil return chamber of the steering cylinder is connected to the solenoid directional valve, which in turn is connected to the oil tank.

5. An engineering vehicle, characterized in that: The emergency steering system for a power-off trailer for engineering vehicles as described in any one of claims 1 to 4.

6. An engineering vehicle according to claim 5, characterized in that: The engineering vehicles are wheeled vehicles.

7. An engineering vehicle according to claim 6, characterized in that: The wheeled vehicle is a wheeled excavator.

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