Trailer speed regulation suspension system

Abstract

The invention discloses a trailer speed regulation suspension system, and relates to the technical field of engineering machinery, the trailer speed regulation suspension system comprises a local side suspension unit and an opposite side suspension unit which are symmetrically arranged, the local side suspension unit comprises a local side suspension valve, a local side suspension oil cylinder, a local side pneumatic control valve and a local side energy accumulator, the opposite-side suspension unit comprises an opposite-side suspension valve, an opposite-side suspension oil cylinder, an opposite-side pneumatic control valve and an opposite-side energy accumulator, and the side suspension valve is connected with a large cavity of the side suspension oil cylinder, a small cavity of the opposite-side suspension oil cylinder, the side pneumatic control valve and the side energy accumulator; the opposite-side suspension valve is connected with a large cavity of the opposite-side suspension oil cylinder, a small cavity of the current-side suspension oil cylinder, an opposite-side pneumatic control valve and an opposite-side energy accumulator; each suspension valve comprises a speed regulating valve used for regulating the flow of hydraulic oil. According to the invention, the speed regulating valve is additionally arranged in the suspension valve, so that the through-flow flows of the large cavity of the suspension oil cylinder on the side, the small cavity of the suspension oil cylinder on the opposite side and the energy accumulator can be regulated, and the hydraulic oil flow in a suspension system can be adaptively regulated under different working conditions of a vehicle.

Description

Technical Field

[0001] The invention relates to a trailer speed regulating suspension system, belonging to the technical field of engineering machinery. Background Art

[0002] A trailer generally consists of two parts: the tractor head and the trailer body. The tractor head is mainly responsible for providing power and driving, while the trailer body is responsible for loading the cargo. These two parts are connected together by a traction saddle and a traction pin to complete the transportation task together.

[0003] Trailers are an important type of road transport. Transporting them by car train is the most effective and simple means to improve economic benefits. It has the advantages of rapidity, mobility, flexibility and safety. The trailer suspension system mostly uses leaf spring suspension. When the trailer needs to have the function of lifting and adjusting the height, oil-gas suspension technology can also be used.

[0004] Oil-gas suspension technology is a new type of chassis suspension technology and a special case of air suspension. It has incomparable advantages over ordinary leaf spring suspension and is an essential key technology for the development of special vehicles, large engineering vehicles and other multi-axle vehicles. Oil-gas suspension consists of suspension cylinders, accumulators, suspension valve groups, hydraulic pipelines, electrical switches and electrical controllers, which can achieve the lifting and lowering of the vehicle body height and leveling of the vehicle body. The suspension cylinder connects the axle and the frame, and completes the lifting and leveling functions of the frame. The accumulator contains inert gas nitrogen, which has the functions of energy conversion, buffering and vibration absorption. The suspension valve group controls the lifting and lowering of the suspension cylinder through electrical signals.

[0005] However, with the current oil-gas suspension technology, when all the goods on the trailer are removed and the trailer leaves the transport site, the suspension system changes from rigid to elastic. Because the gas in the accumulator is in a compressed state in the rigid state, the accumulator and the suspension cylinder resume large flow communication at the moment of switching to the elastic state, the gas in the accumulator quickly relaxes and releases, and a large amount of hydraulic oil is transferred to the large chamber of the suspension cylinder, which can easily cause the trailer bucket to rise rapidly, causing an impact on the trailer. In addition, the large chamber of the suspension cylinder on this side always maintains a large flow communication with the small chamber of the suspension cylinder on the opposite side and the accumulator. When the system pressure changes, the bracket suspension system does not have a speed regulation function. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a trailer speed-regulating suspension system, in which a speed-regulating valve is added to the suspension valve to achieve regulation of the flow rate of the large chamber of the suspension cylinder on this side, the small chamber of the suspension cylinder on the opposite side and the accumulator, so that the vehicle can adaptively adjust the hydraulic oil flow rate of the suspension system under different working conditions, and can reduce the flow rate from the accumulator to the large chamber of the suspension cylinder when the trailer switches between rigid and elastic states, slow down the loading speed of the truck bed, and solve the impact on the trailer caused by changes in bearing capacity.

[0007] To achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a trailer speed regulating suspension system, comprising a symmetrically arranged local suspension unit and an opposite-side suspension unit, wherein both the local suspension unit and the opposite-side suspension unit are provided with an oil inlet pipeline and an oil return pipeline, and both the oil inlet pipeline and the oil return pipeline are connected to a tractor engine; The suspension unit on this side includes a suspension valve on this side, a suspension cylinder on this side, an air-controlled valve on this side and an accumulator on this side, and the suspension unit on the opposite side includes a suspension valve on the opposite side, a suspension cylinder on the opposite side, an air-controlled valve on the opposite side and an accumulator on the opposite side. The suspension valve on this side is connected to a large chamber of the suspension cylinder on this side, a small chamber of the suspension cylinder on the opposite side, the air-controlled valve on this side and the accumulator on this side, and the suspension valve on the opposite side is connected to a large chamber of the suspension cylinder on the opposite side, a small chamber of the suspension cylinder on this side, the air-controlled valve on the opposite side and the accumulator on the opposite side; The suspension valve on this side and the suspension valve on the opposite side both include a speed regulating valve, and the speed regulating valve is used to regulate the flow of hydraulic oil.

[0008] Further, the suspension valve on this side and the suspension valve on the opposite side both include port A1, port A2, port B1 and port B2, and the air-controlled valve on this side and the air-controlled valve on the opposite side both include oil port A and oil port B; In the suspension unit on this side, the A1 port of the suspension valve on this side is connected to the large chamber of the suspension oil cylinder on this side, the A2 port of the suspension valve on this side is connected to the A oil port of the air control valve on this side, the B1 port of the suspension valve on this side is connected to the small chamber of the suspension oil cylinder on the opposite side, and the B2 port of the suspension valve on this side is connected to the B oil port of the air control valve on this side and the accumulator on this side; In the opposite suspension unit, the A1 port of the opposite suspension valve is connected to the large chamber of the opposite suspension cylinder, the A2 port of the opposite suspension valve is connected to the A oil port of the opposite air control valve, the B1 port of the opposite suspension valve is connected to the small chamber of the suspension cylinder on this side, and the B2 port of the opposite suspension valve is connected to the B oil port of the opposite air control valve and the opposite accumulator.

[0009] Furthermore, the air-controlled valve on this side and the air-controlled valve on the opposite side also include a C air port and an O air port; when the C air port is ventilated, the A oil port and the B oil port are not interconnected, and the suspension system is in a rigid state; when the O air port is ventilated, the A oil port and the B oil port are interconnected, and the suspension system is in an elastic state.

[0010] Furthermore, the suspension valve on this side and the suspension valve on the opposite side each include a suspension raising solenoid valve, a suspension lowering solenoid valve and a suspension overflow valve; The suspension raising solenoid valve is arranged on the oil inlet pipeline, and the suspension lowering solenoid valve is arranged on the oil return pipeline. The oil inlet pipeline and the oil return pipeline are both connected to the A2 port, and are connected to the A1 port through the speed regulating valve. The oil return pipeline is also connected to the B1 port and the B2 port through the suspension overflow valve.

[0011] Furthermore, the speed regulating valve is a two-position two-way type, which includes a first oil port, a second oil port, a first gear position and a second gear position, the first oil port is connected to an oil inlet pipeline and an oil return pipeline, and the second oil port is connected to the A1 port; The flow rate between the first oil port and the second oil port can be achieved by switching the first gear and the second gear; When the suspension system switches between the elastic state and the rigid state, the flow rate between the first oil port and the second oil port can be adjusted in a gradient by adjusting the current of the speed regulating valve.

[0012] Furthermore, the suspension valve on this side and the suspension valve on the opposite side are also provided with an M2 port, and the M2 port is used to measure the hydraulic oil pressure, and is connected to a pressure gauge.

[0013] Furthermore, the oil inlet pipeline and the oil outlet pipeline are connected to the tractor engine via quick-connect connectors, and an overflow valve is also connected between the oil inlet pipeline and the oil outlet pipeline.

[0014] Furthermore, an oil pump is provided at the power take-off port of the tractor engine, and the oil pump is used to provide a power source for the oil inlet pipeline.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The suspension valve of the present invention is provided with a speed regulating valve, and the flow rate between the first oil port and the second oil port can be adjusted by adjusting the current of the speed regulating valve, thereby realizing the adjustment of the flow rate of the hydraulic oil in the oil circuit between the large cavity of the suspension cylinder on this side, the small cavity of the suspension cylinder on the opposite side and the accumulator on this side, and the large cavity of the suspension cylinder on the opposite side, the small cavity of the suspension cylinder on this side and the accumulator on the opposite side, and by adjusting the current of the speed regulating valve, the vehicle can meet the adaptive gradient adjustment of the hydraulic flow under different working conditions, so that the trailer suspension system reduces the flow rate from the accumulator to the large cavity of the suspension cylinder when switching between the rigid and elastic states, and finally slows down the loading speed of the bucket, effectively reducing the impact on the trailer caused by the change of bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a trailer speed regulating suspension system in one embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of a suspension valve of a trailer speed regulating suspension system in one embodiment of the present invention; In the figure: 1-oil pump, 2-overflow valve, 3-quick plug connector, 4-suspension valve on this side, 41-suspension raising solenoid valve, 42-suspension lowering solenoid valve, 43-suspension overflow valve, 44-speed regulating valve, 5-suspension cylinder on this side, 6-accumulator on this side, 7-air control valve on this side, 8-accumulator on the opposite side, 9-suspension valve on the opposite side, 10-suspension cylinder on the opposite side, 11-air control valve on the opposite side. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a trailer speed regulating suspension system, including a suspension unit on this side and a suspension unit on the opposite side, the suspension unit on this side and the suspension unit on the opposite side are symmetrically arranged, and both are provided with an oil inlet pipeline and an oil return pipeline, and the oil inlet pipeline and the oil return pipeline are both connected to the tractor engine. An oil pump 1 is provided at the power take-off port of the tractor engine, and the oil pump 1 is used to provide a power source for the suspension system.

[0019] In this embodiment, for easy installation and disassembly, the oil inlet and return lines of the suspension unit on this side and the suspension unit on the opposite side are connected to the tractor engine through a quick-connect connector 3. A relief valve 2 is also provided between the oil inlet line and the oil return line, and the relief valve 2 plays a safety protection role for the hydraulic system.

[0020] The suspension unit on this side includes the suspension valve 4 on this side, the suspension cylinder 5 on this side, the air control valve 7 on this side and the accumulator 6 on this side. The suspension unit on the opposite side includes the suspension valve 9 on the opposite side, the suspension cylinder 10 on the opposite side, the air control valve 11 on the opposite side and the accumulator 8 on the opposite side. The structures of the corresponding components on this side and the opposite side are consistent. The suspension valve is used to realize the lifting and leveling functions of the frame by controlling the internal solenoid valve. The suspension cylinder connects the axle and the frame and drives the frame to lift. The accumulator contains inert gas nitrogen, which plays the role of energy conversion, buffering and vibration absorption.

[0021] Specifically, the suspension valve includes A1 port, A2 port, B1 port, B2 port and M2 port, wherein M2 port is used to connect a pressure gauge, and the pressure gauge is used to measure the hydraulic oil pressure in the suspension system. The suspension cylinder includes a large chamber ( Figure 1 Middle A mouth) and small cavity ( Figure 1 The air control valve includes the A oil port, B oil port, C air port and O air port.

[0022] For the suspension unit on this side, the A1 port of the suspension valve 4 on this side is connected to the large chamber of the suspension cylinder 5 on this side, the A2 port of the suspension valve 4 on this side is connected to the A oil port of the air control valve 7 on this side, the B1 port of the suspension valve 4 on this side is connected to the small chamber of the suspension cylinder 10 on the opposite side, and the B2 port of the suspension valve 4 on this side is connected to the B oil port of the air control valve 7 on this side and the accumulator 6 on this side.

[0023] For the opposite suspension unit, the A1 port of the opposite suspension valve 9 is connected to the large chamber of the opposite suspension cylinder 10, the A2 port of the opposite suspension valve 9 is connected to the A oil port of the opposite air control valve 11, the B1 port of the opposite suspension valve 9 is connected to the small chamber of the suspension cylinder 5 on this side, and the B2 port of the opposite suspension valve 9 is connected to the B oil port of the opposite air control valve 11 and the opposite accumulator 8.

[0024] The air control valve also includes C port and O port; when C port is ventilated, A port and B port are not intercommunication, and the suspension system is in a rigid state. When O port is ventilated, A port and B port are intercommunication, and the suspension system is in an elastic state.

[0025] The internal structure of the suspension valve is as follows: Figure 2 As shown, the suspension valve includes a suspension raising solenoid valve 41, a suspension lowering solenoid valve 42, a suspension overflow valve 43 and a speed regulating valve 44. The suspension raising solenoid valve 41 and the suspension lowering solenoid valve 42 are respectively arranged on the oil inlet pipeline and the oil return pipeline, and the oil inlet pipeline and the oil return pipeline are both connected to the A2 port and connected to the A1 port via the speed regulating valve 44. The oil return pipeline is also connected to the B1 port, the B2 port and the M2 port via the suspension overflow valve 43, and the suspension overflow valve 43 is used to provide safety protection for the overall hydraulic system.

[0026] The speed regulating valve 44 is a two-position two-way type, that is, it includes a first oil port, a second oil port, a first gear position and a second gear position. The first oil port is connected to the oil inlet pipeline and the oil return pipeline, and the second oil port is connected to the A1 port. The flow rate between the first oil port and the second oil port can be adjusted by switching the first gear position and the second gear position. In this embodiment, when in the first gear position, the first oil port and the second oil port are interconnected with a small flow rate, and when in the second gear position, the first oil port and the second oil port are interconnected with a large flow rate.

[0027] Furthermore, by adjusting the current of the speed control valve 44, a more detailed gradient adjustment of the hydraulic oil flow rate can be achieved.

[0028] The working principle of the present invention is: When the frame needs to be raised, the oil inlet pipeline, i.e., the P port, supplies oil, and controls the suspension lifting solenoid valve 41 to be energized, the speed regulating valve 44 to be energized, and the speed regulating valve 44 is in the first gear position. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected with a small flow, and the hydraulic oil enters the large chamber of the suspension oil cylinder, so that the frame rises. When the frame rises to a certain height and does not need to continue to rise, the speed regulating valve 44 is not energized, and the speed regulating valve 44 is in the second gear position. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected with a large flow.

[0029] When the frame needs to be lowered, the control suspension lowering solenoid valve 42 is energized, the speed regulating valve 44 is energized, and the speed regulating valve 44 is in the first gear position. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected with a small flow rate. Under the action of the vehicle's gravity, the hydraulic oil in the large chamber of the suspension oil cylinder is discharged, so that the vehicle is lowered. When the frame is lowered to a certain height and does not need to continue to descend, the speed regulating valve 44 is not energized, and the speed regulating valve 44 is in the second gear position. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected with a large flow rate.

[0030] When the vehicle is in the process of driving, the speed regulating valve 44 is de-energized. Under the action of the spring force, the speed regulating valve 44 is in the second gear. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected with each other at a large flow rate. During the driving process, the vehicle is bumped, so that the hydraulic oil flows through the large cavity of the accumulator 6 and the suspension cylinder 5 on this side and the small cavity of the suspension cylinder 10 on the opposite side, and also flows through the large cavity of the accumulator 8 and the suspension cylinder 10 on the opposite side and the small cavity of the suspension cylinder 5 on this side. At this time, the compression and release of the gas in the accumulator are used to buffer the trailer.

[0031] When the vehicle reaches the destination, in order to keep the height of the frame unchanged with the horizontal plane, the C air ports of the air control valve 7 on this side and the air control valve 11 on the opposite side are ventilated, so that the A oil port and the B oil port of the air control valve 7 on this side and the air control valve 11 on the opposite side are not interconnected. At this time, the oil circuits of the accumulator 6 on this side, the large chamber of the suspension cylinder 5 on this side and the small chamber of the suspension cylinder 10 on the opposite side, the accumulator 8 on the opposite side, the large chamber of the suspension cylinder 10 on the opposite side and the small chamber of the suspension cylinder 5 on this side are disconnected, so that the suspension system is adjusted from an elastic state to a rigid state, and the frame rises due to the reduction of the load-bearing weight. At this time, the cargo unloading work can be completed.

[0032] When the vehicle is ready to leave the destination after completing the unloading of the cargo, the speed regulating valve 44 is energized and is in the first gear. At this time, the first oil port and the second oil port of the speed regulating valve 44 are interconnected at a small flow rate, and then the O air port of the air control valve 7 on this side and the air control valve 11 on the opposite side are ventilated, so that the A oil port and the B oil port of the air control valve 7 on this side and the air control valve 11 on the opposite side are interconnected. At this time, the oil circuits of the accumulator 6 on this side, the large chamber of the suspension cylinder 5 on this side and the small chamber of the suspension cylinder 10 on the opposite side, the accumulator 8 on the opposite side, the large chamber of the suspension cylinder 10 on the opposite side and the small chamber of the suspension cylinder 5 on this side are reconnected, so that the suspension system is adjusted from a rigid state to an elastic state. At this time, the gas in the accumulator is relaxed and released to transfer the squeezed hydraulic oil to the second oil port through the first oil port and flow to the large chamber oil port of the suspension cylinder.

[0033] In this embodiment, when the suspension system switches between rigid and elastic states, the current supplied to the speed control valve 44 can be adjusted, and the flow rate between the first oil port and the second oil port of the speed control valve 44 can be slowly and gradually adjusted. In this way, when the state of the suspension system changes instantaneously, the suspension cylinder will not rise rapidly due to the release of gas in the accumulator, thereby reducing the attack on the trailer.

[0034] In some embodiments, the user can also change the current according to the different conditions of the vehicle, thereby changing the lifting speed of the frame.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A trailer speed regulating suspension system, characterized in that: It comprises a symmetrically arranged suspension unit on this side and a suspension unit on the opposite side, wherein both the suspension unit on this side and the suspension unit on the opposite side are provided with an oil inlet pipeline and an oil return pipeline, and both the oil inlet pipeline and the oil return pipeline are connected to the engine of the tractor; The suspension unit on this side includes a suspension valve on this side, a suspension cylinder on this side, an air-controlled valve on this side and an accumulator on this side, and the suspension unit on the opposite side includes a suspension valve on the opposite side, a suspension cylinder on the opposite side, an air-controlled valve on the opposite side and an accumulator on the opposite side. The suspension valve on this side is connected to a large chamber of the suspension cylinder on this side, a small chamber of the suspension cylinder on the opposite side, the air-controlled valve on this side and the accumulator on this side, and the suspension valve on the opposite side is connected to a large chamber of the suspension cylinder on the opposite side, a small chamber of the suspension cylinder on this side, the air-controlled valve on the opposite side and the accumulator on the opposite side; The suspension valve on this side and the suspension valve on the opposite side both include a speed regulating valve, and the speed regulating valve is used to regulate the flow of hydraulic oil.

2. The trailer speed regulating suspension system according to claim 1, characterized in that: The suspension valve on this side and the suspension valve on the opposite side both include port A1, port A2, port B1 and port B2, and the air control valve on this side and the air control valve on the opposite side both include oil port A and oil port B; In the suspension unit on this side, the A1 port of the suspension valve on this side is connected to the large chamber of the suspension oil cylinder on this side, the A2 port of the suspension valve on this side is connected to the A oil port of the air control valve on this side, the B1 port of the suspension valve on this side is connected to the small chamber of the suspension oil cylinder on the opposite side, and the B2 port of the suspension valve on this side is connected to the B oil port of the air control valve on this side and the accumulator on this side; In the opposite suspension unit, the A1 port of the opposite suspension valve is connected to the large chamber of the opposite suspension cylinder, the A2 port of the opposite suspension valve is connected to the A oil port of the opposite air control valve, the B1 port of the opposite suspension valve is connected to the small chamber of the suspension cylinder on this side, and the B2 port of the opposite suspension valve is connected to the B oil port of the opposite air control valve and the opposite accumulator.

3. The trailer speed regulating suspension system according to claim 2, characterized in that: The air-controlled valve on this side and the air-controlled valve on the opposite side also include a C air port and an O air port; when the C air port is ventilated, the A oil port and the B oil port are not interconnected, and the suspension system is in a rigid state; when the O air port is ventilated, the A oil port and the B oil port are interconnected, and the suspension system is in an elastic state.

4. The trailer speed regulating suspension system according to claim 1, characterized in that: The suspension valve on this side and the suspension valve on the opposite side also include a suspension raising solenoid valve, a suspension lowering solenoid valve and a suspension overflow valve; The suspension raising solenoid valve is arranged on the oil inlet pipeline, and the suspension lowering solenoid valve is arranged on the oil return pipeline. The oil inlet pipeline and the oil return pipeline are both connected to the A2 port, and are connected to the A1 port through the speed regulating valve. The oil return pipeline is also connected to the B1 port and the B2 port through the suspension overflow valve.

5. The trailer speed regulating suspension system according to claim 1, characterized in that: The speed regulating valve is a two-position two-way type, comprising a first oil port, a second oil port, a first gear position and a second gear position, wherein the first oil port is connected to an oil inlet pipeline and an oil return pipeline, and the second oil port is connected to the A1 port; The flow rate between the first oil port and the second oil port can be achieved by switching the first gear and the second gear; When the suspension system switches between the elastic state and the rigid state, the flow rate between the first oil port and the second oil port can be adjusted in a gradient by adjusting the current of the speed regulating valve.

6. The trailer speed regulating suspension system according to claim 2, characterized in that: The suspension valve on this side and the suspension valve on the opposite side are also provided with an M2 port, and the M2 port is used to measure the hydraulic oil pressure, and is connected to a pressure gauge.

7. The trailer speed regulating suspension system according to claim 1, characterized in that: The oil inlet pipeline and the oil outlet pipeline are connected to the tractor engine through quick-plug connectors, and an overflow valve is also connected between the oil inlet pipeline and the oil outlet pipeline.

8. The trailer speed regulating suspension system according to claim 1, characterized in that: An oil pump is provided at the power take-off port of the tractor engine, and the oil pump is used to provide a power source for the oil inlet pipeline.

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