Tire anti-reverse linkage device

Abstract

The utility model discloses a tire anti-reverse linkage device, which relates to the technical field of vehicle engineering, is designed for solving the problem that a tire is easy to reverse and wear when a hydrostatic driving vehicle goes down a slope, and mainly comprises an overflow valve and a one-way valve which are arranged on a main oil way of a hydrostatic walking system of the vehicle and are positioned on a retreating hydraulic oil way. During normal driving, the one-way valve ensures normal circulation of hydraulic oil, and the device does not interfere with vehicle operation. During downhill, the functions of the hydraulic pump and the motor are reversed to cause the reverse rotation risk of the tire, at the moment, high-pressure oil generated by the downhill motor overflows to B2 from the pilot overflow valve through A2, the pressure fed back to the pump is reduced, the system pressure is prevented from rising, the vehicle is prevented from speeding up, and the tire reverse rotation is inhibited. The device can effectively protect tires, stabilize system pressure and vehicle speed and protect a diesel engine, has the characteristics of automatic control and convenience in installation and detection, is particularly suitable for coal mine hydrostatic transmission control scenes, and reduces tire wear and potential safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of vehicle engineering technology, and in particular to a tire anti-reverse linkage device. Background Technology

[0002] In today's industrial production and transportation sectors, hydrostatic transmission technology has been widely used in various vehicles due to its excellent power and control performance. Especially in trackless auxiliary transportation scenarios in mines, particularly in support transport vehicles, hydrostatic drive technology has become increasingly mature and has been widely adopted in underground coal mine operations.

[0003] However, hydrostatically driven vehicles face a series of challenging technical problems when descending slopes. Due to the vehicle's inertia, especially on steep inclines, the gravitational force increases significantly. This change causes the functions of the pump and motor in the hydraulic drive system to reverse. The hydraulic pump, which normally provides power output, now functions like a motor, while the hydraulic motor functions like a pump, resulting in a reverse power transmission phenomenon. In this situation, the engine primarily brakes through frictional torque, known as engine braking. This braking method is closely related to the displacement ratio of the hydrostatic pump and motor. When the pump displacement is zero, the vehicle relies on the motor displacement and system pressure to achieve braking, which is hydrostatic braking.

[0004] During the instantaneous changes in pump and motor functions, vehicle tires may reverse direction. As vehicles frequently ascend and descend slopes in mining and other working environments, this tire reversal can cause severe damage. Frequent reversal leads to uneven stress on the tires, accelerating wear and significantly shortening their lifespan. Furthermore, excessive tire wear results in high replacement costs, increasing the economic burden of equipment operation. Simultaneously, tire wear can trigger tire blowouts and other safety issues, posing significant safety hazards to the lives of underground workers and the smooth operation of production.

[0005] While some attempts have been made to address these issues, the results have been less than ideal. Some solutions are structurally complex, increasing equipment costs and installation difficulty, as well as the complexity and cost of subsequent maintenance. Some methods may only address a single problem, failing to fully consider the chain reaction caused by the interaction of various components in the hydraulic system when a vehicle is descending a slope. Therefore, there is an urgent need for a simple, easy-to-install and test, and automatically controllable effective device to solve the problem of tire rollover when a hydrostatically driven vehicle is descending a slope, reducing tire wear and ensuring vehicle safety and stability. This utility model, a vehicle downhill anti-rollover linkage device, was developed based on this background need. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a tire anti-reverse linkage device. This device solves a series of problems that occur when hydrostatically driven vehicles descend slopes, where the hydraulic pump and motor reverse their functions due to inertia and gradient. These problems lead to instantaneous tire reversal, accelerated wear, increased system pressure, vehicle speed loss, and diesel engine overspeed. Furthermore, considering the limitations of some existing solutions, such as complex structures, high installation and maintenance costs, and inability to comprehensively solve the problem, this invention installs an anti-reverse control device consisting of an overflow valve and a check valve on the main oil circuit of the hydrostatic travel system. This allows for precise regulation of the hydraulic system pressure, effectively preventing tire reversal and wear, avoiding system pressure and vehicle speed loss, and preventing diesel engine overspeed. It also boasts advantages such as simple structure, ease of installation and testing, and automatic control.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A tire anti-reverse linkage device includes an anti-reverse control device installed on the main oil circuit of the vehicle's hydrostatic travel system. The anti-reverse control device is installed on the hydraulic oil circuit for reversing the vehicle and is used to prevent the tire from instantly reversing when the vehicle is going down a steep slope, caused by the hydraulic pump and motor in the hydraulic system operating under opposite conditions.

[0009] The anti-reverse control device mainly consists of an overflow valve and a check valve.

[0010] Preferably, the one-way valve is installed on the reverse circuit of the walking system. When the vehicle is on a normal flat road or uphill, the hydraulic oil passes through the one-way valve normally without affecting the normal operation of the vehicle.

[0011] Preferred configuration: When the vehicle is going downhill, the high-pressure oil generated by the downhill motor overflows through A2 and the overflow valve to B2, reducing the pressure fed back to the pump to prevent the system pressure from increasing and the vehicle from accelerating.

[0012] Preferably, the device is suitable for hydrostatic transmission control in coal mines.

[0013] Preferably, the overflow valve is a pilot overflow valve, which precisely controls the pressure fed back to the pump by adjusting the overflow of high-pressure oil generated during downhill flow.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By installing an anti-reverse control device consisting of an overflow valve and a check valve on the main hydraulic circuit of the vehicle's hydrostatic travel system, especially on the reverse hydraulic circuit, the problem of instantaneous tire reversal caused by the reverse function of the hydraulic pump and motor when the vehicle is going downhill can be precisely addressed. When going downhill, this device can promptly adjust the hydraulic system pressure, suppressing the tire reversal tendency, greatly reducing tire wear caused by frequent reversals, extending tire life, and lowering equipment wear and tear costs.

[0016] Second, when the vehicle experiences abnormally high hydraulic system pressure and excessive speed while descending a slope, the high-pressure oil generated by the downhill motor overflows through pilot relief valve A2 to B2, reducing the pressure fed back to the pump. This effectively prevents excessive system pressure and avoids accelerating the vehicle. This ensures the vehicle can travel slowly and smoothly on the slope, significantly improving the safety and stability of downhill driving and reducing the risk of accidents caused by excessive speed.

[0017] Third, this device not only prevents tire rollover and controls vehicle speed, but also avoids diesel engine overspeeding caused by vehicle speeding downhill. By stabilizing the vehicle's downhill state, it ensures the diesel engine operates within a reasonable speed range, reducing abnormal wear and the risk of failure, extending the engine's service life, and lowering maintenance costs.

[0018] Fourth, this device can automatically sense changes in the vehicle's driving status and automatically intervene when the vehicle is going downhill, without requiring additional manual intervention. This automatic control method ensures both the timeliness and accuracy of the device's response and reduces the driver's workload, allowing the driver to focus more on vehicle steering control, thus improving the driving experience and safety. At the same time, the device's simple structural design facilitates installation on the main oil line of the vehicle's hydrostatic drive system, and its ease of subsequent inspection and maintenance effectively reduces maintenance costs and time.

[0019] V. Particularly suitable for hydrostatic transmission control scenarios in coal mines. Underground coal mine conditions are complex, with vehicles frequently going up and down slopes, making the tire rollover problem even more severe for hydrostatically driven vehicles. This device is designed specifically for the characteristics of underground coal mine operations, effectively solving the tire wear problem in this scenario, ensuring efficient and safe underground transportation work, improving production efficiency, and reducing the risk of production interruptions due to tire damage. Attached Figure Description

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram illustrating the principle of this utility model.

[0022] Legend: 1. Overflow valve; 2. Check valve. Detailed Implementation

[0023] This application provides a tire anti-reverse linkage device that effectively solves a series of problems in hydrostatically driven vehicles when going downhill, where the hydraulic pump and motor reverse due to motion inertia and slope, leading to instantaneous tire reversal, accelerated wear, increased system pressure, vehicle speed loss, and diesel engine overspeed. Furthermore, considering the shortcomings of some existing solutions, such as complex structure, high installation and maintenance costs, and inability to comprehensively solve the problem, this application installs an anti-reverse control device consisting of an overflow valve and a check valve on the main oil circuit of the hydrostatic travel system. This achieves precise regulation of the hydraulic system pressure, effectively preventing tire reversal and wear, avoiding system pressure and vehicle speed loss, preventing diesel engine overspeed, and possessing the advantages of simple structure, easy installation, testing, and automatic control. Example

[0024] like Figure 1 As shown, the overall technical solution in this application embodiment is as follows:

[0025] To address the problems existing in the prior art, this utility model provides a tire anti-reverse linkage device, which mainly consists of an overflow valve 1 and a one-way valve 2 to form an anti-reverse control device, and is installed on the main oil line of the vehicle's hydrostatic walking system, specifically located on the hydraulic oil line for the vehicle's backward movement.

[0026] During actual installation, it is necessary to ensure that the one-way valve 2 is accurately positioned on the reverse circuit of the walking system to ensure that hydraulic oil can smoothly pass through the one-way valve 2 when the vehicle is traveling on a normal flat road and uphill, without interfering with the normal operating conditions of the vehicle. The relief valve 1 is a pilot relief valve, installed at a position related to the path of the high-pressure oil generated by the downhill motor. That is, the high-pressure oil generated by the downhill motor can reach the pilot relief valve 1 through A2, and then reach B2 after overflow.

[0027] Operating principles under different driving conditions:

[0028] I. Normal traction status:

[0029] When the vehicle is under normal traction, the diesel engine outputs torque to drive the vehicle. At this time, the hydraulic system operates in its normal working mode, with hydraulic oil flowing normally through check valve 2. The entire hydrostatic travel system works stably, and the vehicle moves forward smoothly. During this process, the overflow valve 1 in the anti-reverse control device does not participate in the main operation; check valve 2 only serves to ensure the normal unidirectional flow of hydraulic oil, ensuring the coordinated operation of all components under normal driving conditions.

[0030] II. Downhill condition:

[0031] When a vehicle descends a slope, due to inertia, especially on steep inclines, the component of gravity increases, causing the functions of the pump and motor in the hydraulic drive to change in opposite directions. At this time, the diesel engine changes from an output torque state to a passive speed-up state, and the engine's frictional resistance cannot overcome the hydraulic traction force.

[0032] Specifically, when the vehicle is going downhill or changing direction, the hydraulic pump and motor in the B1 high-pressure oil system operate in opposite directions. The B2 port, which was originally at low pressure, becomes high pressure. This high pressure drives the pump's variable displacement swashplate to change to a smaller displacement. Because the pump is operating in a motor-like manner at this time, the tires momentarily reverse direction, accelerating tire wear.

[0033] The anti-reverse device of this invention then comes into play. The high-pressure oil generated by the downhill motor enters the pilot relief valve 1 through A2, and overflows to B2 after passing through the pilot relief valve 1. This reduces the pressure fed back to the pump. In this way, it effectively prevents the system pressure from rising and the vehicle from accelerating, thereby protecting the tires and achieving automatic control of the vehicle's downhill operation. This allows the vehicle to travel slowly and smoothly on the slope, ensuring driving safety. At the same time, this device also prevents the diesel engine from overspeeding due to the vehicle speeding downhill, thus protecting the diesel engine.

[0034] III. Application Scenarios:

[0035] This tire anti-reverse linkage device is particularly suitable for hydrostatic transmission control scenarios in coal mines. The underground working environment in coal mines is complex, and vehicles frequently need to ascend and descend slopes. Under these conditions, the problem of tire reversal due to changes in the operating conditions of the hydraulic pump and motor is more pronounced in hydrostatically driven vehicles. This device effectively solves this problem, reduces tire wear, minimizes equipment damage and safety hazards, and ensures the smooth operation of underground transportation in coal mines.

[0036] Working principle:

[0037] When the vehicle is under normal traction, the diesel engine outputs torque to power the vehicle's movement. At this time, the hydrostatic travel system operates in normal mode; the hydraulic pump converts mechanical energy into hydraulic energy, driving the hydraulic motor to rotate the wheels, allowing the vehicle to move smoothly forward. The one-way valve 2, installed on the vehicle's reversing hydraulic circuit, allows hydraulic oil to flow normally, ensuring unobstructed hydraulic circuitry and not affecting normal vehicle operation. Meanwhile, the relief valve 1 does not participate in primary operation in this state and remains in standby mode.

[0038] As the vehicle begins its descent, the force of gravity increases due to inertia and the slope. This causes the functions of the pump and motor in the hydraulic drive to reverse. The hydraulic pump, which normally provides power output, now functions like a motor, while the hydraulic motor functions like a pump. At this moment of transition, the pressure at pump terminals B1 and B2 changes: high-pressure oil at B1 moves forward, while high-pressure oil at B2 moves backward. When the vehicle descends or changes direction, the pressure at port B2 changes from low to high. This high pressure acts on the pump's variable displacement swashplate, causing it to shift towards a smaller displacement. Due to the reversed functions of the pump and motor, the tires may experience a tendency to reverse direction at this instant. If left uncontrolled, frequent ascents and descents can easily damage the rear tires.

[0039] The high-pressure oil generated by the downhill motor flows through path A2 to pilot relief valve 1. Relief valve 1 regulates the overflow of this high-pressure oil, diverting a portion into circuit B2. This overflow operation reduces the pressure fed back to the pump, effectively preventing excessive system pressure and avoiding vehicle acceleration due to high system pressure. This suppresses the tendency of the tires to roll backward, protecting them from excessive wear. Simultaneously, it prevents diesel engine overspeeding that could occur due to excessive downhill speed, allowing the vehicle to travel slowly and smoothly on the slope, ensuring driving safety.

[0040] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A tire anti-reverse linkage device, characterized in that, The tire anti-reverse linkage device includes an anti-reverse control device installed on the main oil circuit of the vehicle's hydrostatic walking system, and the anti-reverse control device is installed on the hydraulic oil circuit for vehicle reversing. The anti-reverse control device mainly consists of an overflow valve (1) and a one-way valve (2).

2. The tire anti-reverse linkage device as described in claim 1, characterized in that: The one-way valve (2) is installed on the backward circuit of the walking system.

3. The tire anti-reverse linkage device as described in claim 1, characterized in that: When the vehicle goes downhill, the high-pressure oil generated by the downhill motor overflows through A2 and the overflow valve (1) to B2, and the pressure fed back to the pump decreases.

4. The tire anti-reverse linkage device as described in claim 1, characterized in that: When the vehicle is on a normal flat road or uphill, the hydraulic oil passes through the check valve (2) normally.

5. The tire anti-reverse linkage device as described in claim 1, characterized in that: The tire anti-reverse linkage device is suitable for use in hydrostatic transmission control in coal mines.

6. The tire anti-reverse linkage device as described in claim 1, characterized in that: The relief valve (1) is a pilot relief valve.

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