An electronically controlled suspension cylinder, an electronically controlled suspension system, and engineering machinery

Abstract

This invention discloses an electronically controlled suspension cylinder, an electronically controlled suspension system, and engineering machinery. The electronically controlled suspension system includes two electronically controlled suspension cylinders, a central rotating body, and an accumulator. Each electronically controlled suspension cylinder includes an electromagnetic directional valve and a suspension cylinder. The valve port of the electromagnetic directional valve is connected to the oil port of the suspension cylinder via a pipeline. The electromagnetic coils of the electromagnetic directional valves of the two electronically controlled suspension cylinders are connected and then connected to the central rotating body. The oil ports at the top of the two electronically controlled suspension cylinders are connected, and an accumulator is installed on the connecting line. This invention associates the activation signal of the electronically controlled suspension system with the vehicle's travel signal. Whenever the vehicle is in motion, the electronically controlled suspension system activates. When activated, the two electronically controlled suspension cylinders and the accumulator are interconnected, providing a shock absorption effect. This invention uses the electromagnetic directional valve and the suspension cylinder in conjunction, eliminating the need for a hydraulically controlled check valve assembly. The suspension system activation is reliable, and there is no risk of instantaneous closure.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to an electronically controlled suspension cylinder, an electronically controlled suspension system, and engineering machinery. Background Technology

[0002] Construction machinery with axles requiring vibration damping, such as wheeled excavators, has a drive system consisting of a front axle and a rear axle. Normally, the rear axle is fixed to the frame, while the front axle is floating. Suspension cylinders, which are plunger-type cylinders, are mounted on both sides of the frame and press against the left and right ends of the front axle. When the vehicle traverses uneven surfaces, the suspension cylinders dampen vibrations, improving driving comfort.

[0003] like Figure 1 As shown, when the vehicle is driving on a smooth road or performing on-board operations, the suspension system is closed. At this time, solenoid valve 3 is not energized and is in the lower position. Pressure oil from pilot pump 2 overflows back to hydraulic oil tank 1 through overflow valve 9. The pressure oil cannot pass through solenoid valve 3 and the central rotating body 4 to open the hydraulic control check valve group 5. Therefore, the large chambers of the left suspension cylinder 7 and the right suspension cylinder 6 are cut off by the check valves and cannot connect, thus the suspension system is closed. When the vehicle travels on an uneven road surface, the suspension system needs to be activated. At this time, solenoid valve 3 is energized and is in the upper position. Pressure oil from pilot pump 2 passes through solenoid valve 3 and the central rotating body 4 to open the hydraulic control check valve group 5. Then, the large chambers of the left suspension cylinder 7 and the right suspension cylinder 6 are connected, the suspension system is activated, and the piston rods of the suspension cylinders press against the left and right sides of the front axle 8. The extension and retraction of the suspension cylinders can provide shock absorption and improve vehicle comfort.

[0004] The defects of the above-mentioned existing technology are as follows: 1. When the suspension system is closed, the hydraulic oil of the pilot pump has to overflow through the relief valve, which is not energy-efficient; 2. The center rotating body requires two channels, which is complex in structure; 3. When the suspension system is open, the hydraulic control check valve group is unstable in opening. When the front axle of the vehicle receives a severe impact, the check valve is at risk of closing instantly, resulting in poor shock absorption. Summary of the Invention

[0005] The purpose of this invention is to provide an electronically controlled suspension cylinder, an electronically controlled suspension system, and engineering machinery. By using an electromagnetic reversing valve and a suspension cylinder together, an electronically controlled suspension cylinder is made, thereby improving the reliability of the suspension system.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of this invention provides an electronically controlled suspension cylinder, comprising a solenoid directional valve and a suspension cylinder.

[0008] The electromagnetic reversing valve is a two-position two-way electromagnetic valve, and the valve port of the electromagnetic reversing valve is connected to the oil port of the suspension cylinder through a pipeline.

[0009] A check valve is integrated on one side of the electromagnetic reversing valve.

[0010] Furthermore, the electromagnetic directional valve is normally de-energized and is in the left position;

[0011] The electromagnetic reversing valve has a check valve integrated in the left position to seal the hydraulic oil inside the suspension cylinder.

[0012] Furthermore, the electromagnetic reversing valve is a cartridge valve, fixed in a corresponding cartridge hole above the suspension cylinder.

[0013] A second aspect of the present invention provides an electronically controlled suspension system, comprising two aforementioned electronically controlled suspension cylinders, a central slewing body, and an accumulator; the plunger rods of the two electronically controlled suspension cylinders press against the left and right sides of the front axle;

[0014] The electromagnetic coils of the electromagnetic reversing valves of the two electrically controlled suspension cylinders are connected, and both are connected to the central rotating body.

[0015] The oil ports at the top of the two electrically controlled suspension cylinders are connected, and an accumulator is installed on the connection line.

[0016] The two electrically controlled suspension cylinders should not be powered under normal conditions.

[0017] Furthermore, the accumulator is pre-charged with a certain pressure during initial installation to provide shock absorption resistance;

[0018] The energy storage device is also used for,

[0019] When the two electrically controlled suspension cylinders are energized, hydraulic oil is replenished to the two electrically controlled suspension cylinders.

[0020] Furthermore, the accumulator is also connected to a one-way valve;

[0021] The one-way valve connected to the accumulator is used to pre-charge the accumulator with pressure during initial installation and maintenance.

[0022] Furthermore, a pressure testing connector is also provided on the connection line of the oil port at the top of the two electrically controlled suspension cylinders.

[0023] The pressure test connector is used to detect the pressure of the electronically controlled suspension system.

[0024] A third aspect of the present invention provides a control method for an electronically controlled suspension system, comprising:

[0025] Upon receiving the start signal, the electrical signal from the upper vehicle is controlled to pass through the central rotating body and energize the two electronically controlled suspension cylinders, causing the electromagnetic reversing valves inside the two electronically controlled suspension cylinders to be in the right position, and the two electronically controlled suspension cylinders and the accumulator to be interconnected.

[0026] Upon receiving the shutdown signal, the two electrically controlled suspension cylinders are de-energized, causing the internal solenoid directional valves to be in the left position. The large-cavity oil circuits of the two electrically controlled suspension cylinders are cut off, and the electrically controlled suspension cylinders cease operation.

[0027] Furthermore, when the vehicle equipped with the electronically controlled suspension system is undergoing onboard operations, a shutdown signal is sent to the electronically controlled suspension system;

[0028] When the vehicle containing the electronically controlled suspension system is moving, an activation signal is sent to the electronically controlled suspension system.

[0029] A fourth aspect of the present invention provides an engineering machine, including an axle and the aforementioned electronically controlled suspension system.

[0030] The beneficial effects of this invention are as follows:

[0031] (1) The present invention designs an electronically controlled suspension cylinder that combines an electromagnetic reversing valve and a suspension cylinder, eliminating the need for a hydraulically controlled check valve assembly. The suspension system can be opened reliably without the risk of instantaneous closure.

[0032] (2) The present invention uses an accumulator to replace the pilot pump, which does not require additional pilot oil, has no overflow, and is more energy-efficient; and does not require a return oil pipeline, making the structure simple.

[0033] (3) The electronically controlled suspension system of the present invention requires only one electrical channel for the central rotating body, and has a simple structure;

[0034] (4) The present invention associates the activation signal of the electronic suspension system with the vehicle travel signal. As long as the vehicle is traveling, the electronic suspension system will be activated, and the control logic is simple. Attached Figure Description

[0035] Figure 1 For existing suspension system structures;

[0036] Figure 2 The structure of the electronically controlled suspension system provided by the present invention. Detailed Implementation

[0037] The present invention will now be further described. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0038] The first aspect of this invention provides an electrically controlled suspension cylinder, which includes a solenoid directional valve and a suspension cylinder.

[0039] The solenoid directional valve is a two-position, two-way solenoid valve, and its valve port is connected to the oil port of the suspension cylinder through a pipeline.

[0040] In this invention, the solenoid directional valve is normally de-energized and in the left position. The left position integrates a check valve to reliably seal the hydraulic oil inside the suspension cylinder. When it needs to be opened, the solenoid directional valve is energized and in the right position.

[0041] As a preferred embodiment, the electromagnetic directional valve can be integrated inside the suspension cylinder. For example, the electromagnetic directional valve is a cartridge valve, fixed in a corresponding cartridge hole above the suspension cylinder.

[0042] Based on the above-mentioned electronically controlled suspension cylinder, a second aspect of the present invention provides an electronically controlled suspension system, comprising: two of the above-mentioned electronically controlled suspension cylinders, a central rotary body, an accumulator, a one-way valve, and a pressure testing connector.

[0043] See Figure 2 The piston rods of the electrically controlled left suspension cylinder 11 and the electrically controlled right suspension cylinder 10 press on the left and right sides of the front axle 8. The electromagnetic coils of the electromagnetic reversing valves of the electrically controlled left suspension cylinder 11 and the electrically controlled right suspension cylinder 10 are connected through the electric control line and are both connected to the central rotating body 12.

[0044] The top ports of the electrically controlled left suspension cylinder 11 and the electrically controlled right suspension cylinder 10 are connected, and an accumulator 13 is installed on the connection line.

[0045] Accumulator 13 is pre-charged with a certain pressure to provide a damping resistance. In addition, the hydraulic oil has a certain elasticity, and when the suspension vibrates violently, the accumulator is also used to replenish a certain amount of hydraulic oil to the two electronically controlled suspension cylinders.

[0046] Furthermore, a pressure test connector 15 is also provided on the connection circuit. The pressure test connector is used to detect the pressure of the electronically controlled suspension system. It is generally used for troubleshooting and for pre-charging pressure during initial installation.

[0047] Furthermore, the accumulator 13 is also connected to a one-way valve 14.

[0048] One-way valve 14 is used to pre-charge the accumulator during initial installation and maintenance; during normal use, it prevents internal pressure leakage of the accumulator.

[0049] It should be noted that the accumulator is pre-charged to a certain pressure during initial installation.

[0050] The control method based on this electronically controlled suspension system is as follows:

[0051] The on / off signals of the electronically controlled suspension system are associated with the travel signals of the wheeled excavator: the electronically controlled suspension system is activated whenever the vehicle is moving; it is deactivated when the vehicle is being used for onboard operations.

[0052] When the vehicle is being loaded for work, the electronic suspension system is shut down. At this time, the electronically controlled left suspension cylinder 11 and the electronically controlled right suspension cylinder 10 are not energized, and their internal solenoid directional valves are both in the left position. The large chamber oil circuit of the electronically controlled suspension cylinder is cut off, and they are not connected to each other and there is no leakage.

[0053] When the vehicle is moving, the electronic suspension system is activated. At this time, the electrical signal from the upper part of the vehicle passes through the central rotating body 12 and powers the electronically controlled left suspension cylinder 11 and the electronically controlled right suspension cylinder 10. Driven by electromagnetic force, the electromagnetic reversing valve inside the suspension cylinder is in the right position, and the two electronically controlled suspension cylinders and the accumulator are interconnected, which plays a role in shock absorption.

[0054] The electronically controlled suspension system provided by this invention can be applied to engineering machinery with axles that require shock absorption, such as wheeled excavators.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electronically controlled suspension system, characterized in that, It includes two electronically controlled suspension cylinders, a central slewing body, and an accumulator; the plunger rods of the two electronically controlled suspension cylinders press against the left and right sides of the front axle; The electrically controlled suspension cylinder includes an electromagnetic reversing valve, which is integrated inside the suspension cylinder. The electromagnetic reversing valve is a cartridge valve, fixed in a corresponding cartridge hole above the suspension cylinder. The electromagnetic reversing valve is a two-position, two-way valve. The electromagnetic reversing valve is normally de-energized and is in the left position. The left position of the electromagnetic reversing valve integrates a check valve to seal the hydraulic oil inside the suspension cylinder. The electromagnetic coils of the electromagnetic reversing valves inside the two electrically controlled suspension cylinders are connected, and both are connected to the central rotating body. The oil ports at the top of the two electrically controlled suspension cylinders are connected, and an accumulator is installed on the connection line. The two electrically controlled suspension cylinders should not be powered under normal conditions. Associate the on / off signals of the electronically controlled suspension system with the travel signals of the wheeled excavator; When the vehicle is being loaded for work, the electronic suspension system is turned off. At this time, the two electronic suspension cylinders are not powered, and their internal solenoid directional valves are both in the left position. The large chamber oil circuit of the electronic suspension cylinder is cut off, and they are not connected to each other and there is no leakage. When the vehicle is moving, the electronic suspension system is activated. At this time, the two electronic suspension cylinders are energized. Driven by electromagnetic force, the electromagnetic reversing valve inside the suspension cylinder is in the right position. The two electronic suspension cylinders and the accumulator are interconnected, which plays a role in shock absorption.

2. The electronically controlled suspension system according to claim 1, characterized in that, The accumulator is pre-charged with a certain pressure when it is first installed to provide shock absorption resistance; The energy storage device is also used for, When the two electrically controlled suspension cylinders are energized, hydraulic oil is replenished to the two electrically controlled suspension cylinders.

3. The electronically controlled suspension system according to claim 2, characterized in that, The accumulator is also connected to a one-way valve; The one-way valve connected to the accumulator is used to pre-charge the accumulator with pressure during initial installation and maintenance.

4. The electronically controlled suspension system according to claim 1, characterized in that, Pressure testing connectors are also provided on the connection lines of the oil ports at the top of the two electrically controlled suspension cylinders. The pressure test connector is used to detect the pressure of the electronically controlled suspension system.

5. The control method for the electronically controlled suspension system according to any one of claims 1 to 4, characterized in that, include: Upon receiving the start signal, the electrical signal from the upper vehicle is controlled to pass through the central rotating body and energize the two electronically controlled suspension cylinders, causing the electromagnetic reversing valves inside the two electronically controlled suspension cylinders to be in the right position, and the two electronically controlled suspension cylinders and the accumulator to be interconnected. Upon receiving the shutdown signal, the two electrically controlled suspension cylinders are de-energized, causing the internal solenoid directional valves to be in the left position. The large-cavity oil circuits of the two electrically controlled suspension cylinders are cut off, and the electrically controlled suspension cylinders cease operation.

6. The control method according to claim 5, characterized in that, When the vehicle with the electronically controlled suspension system is being loaded, a shutdown signal is sent to the electronically controlled suspension system. When the vehicle containing the electronically controlled suspension system is moving, an activation signal is sent to the electronically controlled suspension system.

7. A wheeled excavator, characterized in that, Includes the electronically controlled suspension system as described in any one of claims 1 to 4.

8. An engineering machinery vehicle, including an axle, characterized in that, It also includes the electronically controlled suspension system as described in any one of claims 1 to 4.

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