Piston structure for vehicle suspension having external displacement sensor, and vehicle suspension structure comprising same

Abstract

A piston structure for a vehicle suspension having an external displacement sensor, and a vehicle suspension structure. The piston structure for a vehicle suspension comprises: a cylinder, a piston, a piston rod, a cylinder body connecting shaft, a piston rod connecting shaft, and a displacement sensor; the piston is arranged in the cylinder, the piston rod is connected to the piston, the cylinder body connecting shaft is arranged at one end of the cylinder, the piston rod connecting shaft is arranged at an end of the piston rod, the cylinder body connecting shaft and the piston rod connecting shaft are respectively located at two ends of the cylinder, the cylinder body connecting shaft is connected to a wheel axle, and the piston rod connecting shaft is connected to a vehicle body; one end of the displacement sensor is fixed to the outer wall of the cylinder, the other end of the displacement sensor is of a telescopic structure, and the end of the telescopic structure is connected to the part of the piston rod located outside the cylinder, so that the telescopic structure can move along with the piston rod to obtain a motion state of the piston and then calculate the height of the vehicle body of a vehicle.

Description

Piston structure for vehicle suspension with external displacement sensor and vehicle suspension structure thereof TECHNICAL FIELD

[0001] The utility model relates to vehicle suspension technology of vehicle, especially a kind of piston structure for vehicle suspension with external displacement sensor and vehicle suspension structure thereof. BACKGROUND

[0002] Vehicle cannot leave suspension system, and existing suspension system is generally constituted by spring unit and damping unit. According to road condition, the comfort, stability and safety of vehicle can be improved by real-time control and adjustment of damping and adjustment of part or all vehicle body height. Among them, obtaining vehicle body height information at any time is necessary link in sensing and control system in entire system. The existing technology is mostly to set height sensor on vehicle to measure vehicle body height, and then to carry out electric control to spring unit and damping unit, but there are problems of high cost, complex system and high error probability in existing technology.

[0003] UTILITARY MODEL

[0004] The utility model aims at providing a kind of piston structure for vehicle suspension with external displacement sensor and vehicle suspension structure thereof to solve the above-mentioned prior art problems.

[0005] The utility model discloses a piston structure for vehicle suspension, including: cylinder, piston, piston rod, cylinder body connecting shaft, piston rod connecting shaft and displacement sensor;Wherein, piston is arranged in cylinder, piston rod is connected with piston, cylinder body connecting shaft is arranged at one end of cylinder, piston rod connecting shaft is arranged at the end of piston rod, cylinder body connecting shaft and piston rod connecting shaft are respectively located at both ends of cylinder, cylinder body connecting shaft is connected with wheel shaft, and piston rod connecting shaft is connected with vehicle body;One end of displacement sensor is fixed with the outer wall of cylinder, and the other end is telescopic structure, the end of telescopic structure is connected with the part of piston rod outside cylinder, so that telescopic structure can move along with piston rod, to obtain the movement state of piston, and then calculate the height of vehicle body.

[0006] According to an embodiment of the utility model's piston structure for vehicle suspension, wherein, displacement sensor uses LVDT sensor or LVIT sensor.

[0007] According to an embodiment of the utility model's piston structure for vehicle suspension, wherein, displacement sensor is inductance linear displacement sensor, and the electronic excitation and processing device of inductance displacement sensor of displacement sensor is fixed in the top end of cylinder inner chamber facing piston.

[0008] According to the piston structure for vehicle suspension of the utility model, the displacement sensor is an inductance linear displacement sensor, the linear displacement sensor is arranged in parallel with the outer wall of the cylinder, and the telescopic structure of the linear displacement sensor is consistent with the movement direction of the piston rod.

[0009] According to the piston structure for vehicle suspension of the utility model, the end of the telescopic structure is connected with the part of the piston rod outside the cylinder through the connecting piece.

[0010] According to the piston structure for vehicle suspension of the utility model, the piston guide rail is arranged at the bottom of the cylinder, and the piston rod is arranged on the piston guide rail.

[0011] According to the piston structure for vehicle suspension of the utility model, the dust cover is arranged on the bottom of the cylinder and the outer side of the piston rod.

[0012] The utility model relates to a kind of vehicle suspension structures, wherein, including the piston structure for vehicle of above-mentioned, the piston structure for vehicle is connected expansion liquid container by one liquid damping electric control valve;Expansion liquid container is provided with air bag, and the inflation valve of air bag is installed on expansion liquid container;Air bag can be inflated, to form internal gas space;Expansion liquid container has container internal liquid space;Displacement sensor and a central control unit are connected, and central control unit connects liquid damping electric control valve.

[0013] According to the piston structure for vehicle suspension of the utility model, the expansion liquid container is also connected with liquid valve, and liquid valve is connected with liquid filling and discharging conduit;Central control unit also calculates vehicle body height dynamic information according to the displacement sensor detected, and the liquid of expansion liquid container is filled and discharged through liquid filling and discharging conduit, to control the height of vehicle.

[0014] According to the piston structure for vehicle suspension of the utility model, one or more liquid guide grooves are arranged in expansion liquid container, and the liquid guide groove is used for solution flow guide of the inner chamber of expansion liquid container.

[0015] According to the piston structure for vehicle suspension of the utility model, the inner chamber of cylinder is communicated with expansion liquid container through liquid conduit and damping electric control valve.

[0016] In conclusion, the utility model discloses a kind of piston structure for vehicle suspension of external displacement sensor and its vehicle suspension structure, the both ends of cylinder and piston are connected to vehicle body and wheel axle respectively, central control unit judges and adjusts the size of electric control switch according to the piston head dynamic information detected by displacement sensor arranged in piston, comprehensively vehicle body posture and command information, to change suspension system damping, to achieve the purpose of controlling vehicle suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of a vehicle suspension structure according to the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

[0019] FIG1 is a schematic diagram of a vehicle suspension structure according to the present invention. As shown in FIG1 , the vehicle suspension structure includes a piston structure, specifically comprising: a piston 3, a piston rod 4, a cylinder body connecting shaft 5, a piston rod connecting shaft 6, a piston guide rail 9, and a linear displacement sensor 43 are provided in a cylinder 2. One end of the piston rod 4 is connected to the piston 3, and the piston rod connecting shaft 6 is provided at the other end of the piston rod. The piston 3 divides the internal space of the cylinder 2 into a cylinder inner cavity space 7 and a cylinder outer cavity space 8. The cylinder body connecting shaft 5 is provided at one end of the cylinder 2, and the cylinder body connecting shaft 5 and the piston rod connecting shaft 6 are respectively located at the two ends of the cylinder 2. The piston guide rail 9 is provided at the bottom of the cylinder 2, and the piston rod 4 is provided on the piston guide rail 9.

[0020] As shown in Figure 1, one end of the linear displacement sensor 43 is fixed to the outer wall of the cylinder 2, and the other end is a telescopic structure. The end of the telescopic structure is connected to the part of the piston rod 4 located outside the cylinder 2 through a connecting piece, so that the telescopic structure can follow the movement of the piston rod 4, making it easier for the linear displacement sensor 43 to sense the movement of the piston 3.

[0021] As shown in FIG. 1 , the linear displacement sensor 43 uses a non-contact sensor, such as an LVDT or LVIT sensor.

[0022] As shown in FIG1 , the telescopic structure of the linear displacement sensor 43 is consistent with the movement direction of the piston rod 4. The linear displacement sensor 43 is arranged parallel to the outer wall of the cylinder 2.

[0023] As shown in Figure 1, the cylinder connecting shaft 5 is connected to the wheel shaft, and the piston rod connecting shaft 6 is connected to the vehicle body. Therefore, the measurement of the position of the piston 3 will directly obtain the vehicle body height at this angle.

[0024] As shown in FIG1 , the cylinder 2 , the liquid damping electric control valve 16 , the expansion liquid container 17 and the liquid conduit 15 constitute a vehicle suspension system of a gas-liquid spring.

[0025] As shown in FIG1 , an airbag 18 is disposed within the expansion liquid container 17, and an airbag inflation valve 19 of the airbag 18 is mounted on the cavity wall of the expansion liquid container 17. The airbag 18 can be inflated to form an internal gas space 27. The expansion liquid container 17 has an internal liquid space 26.

[0026] As shown in FIG1 , in a preferred embodiment, liquid guide grooves 23 are provided within the expansion liquid container 17 . These guide grooves 23 are used to guide the solution at both ends of the expansion liquid container 17 , thereby preventing the expansion of the airbag 18 from blocking the flow of liquid at both ends of the expansion liquid container 17 . Specifically, there may be one or more liquid guide grooves 23 , so that after the airbag 18 expands, the liquid can still reach the container 17 and flow flexibly.

[0027] As shown in Figure 1, the cylinder cavity 7 communicates with the expansion liquid container 17 via a liquid conduit 15 and an electrically controlled damping valve 16. The liquid conduit 15 has an internal space 25 for liquid flow. The liquid conduit 15 is connected to the internal liquid space 26 of the expansion liquid container 17 via the electrically controlled damping valve 16. The electrically controlled damping valve 16 has wiring for external power supply and signal transmission. The electrically controlled damping valve 16 is used to control the flow of liquid between the piston and the expansion liquid container 17, working in conjunction with the airbag 18 to adjust the piston's damping and thereby control the vehicle's stiffness.

[0028] As shown in Figure 1, the cylinder and piston are connected to the vehicle body and the axle via the cylinder-body connecting shaft 5 and the piston rod connecting shaft 6, respectively. This is equivalent to detecting the instantaneous change in vehicle height. Specifically, the cylinder-body connecting shaft 5 and the piston rod connecting shaft 6 of the cylinder and piston can be connected to the axle and the vehicle body respectively via levers.

[0029] As shown in FIG1 , the airbag 18 is inside the expansion liquid container 17 and immersed in the liquid 26 . The liquid 26 can be a compressible liquid or an incompressible liquid.

[0030] As shown in FIG. 1 , the dust cover 14 is sleeved on the bottom of the cylinder 2 and the outer side of the piston rod 4 .

[0031] In practice, the damping electronically controlled valve 16 can be installed anywhere between the cylinder 2, the extended liquid container 17, or the liquid conduit 15. The damping electronically controlled valve 16 adjusts the size of its opening to control the amount of liquid passing through, thereby controlling the flow resistance of the liquid. Furthermore, the electronically controlled valve 16 can be pre-positioned with a minimum flow path to ensure minimal fluid flow even when the electronically controlled valve 16 is at its minimum opening. The damping electronically controlled valve 16 can be implemented in a variety of ways, such as using a solenoid valve, a rotary motor, or a linear motor.

[0032] As shown in FIG1 , the extended liquid container 17 is connected to a liquid valve 20 . The liquid valve 20 has a valve switch. The liquid valve 20 is externally connected to a liquid charging and discharging conduit, through which the liquid in the extended liquid container 17 can be charged and discharged.

[0033] As shown in Fig. 1, the gas in the air bag 18 can use air, or inert gas nitrogen or argon. These gases are in a pressurized state under normal use.

[0034] As shown in Fig. 1, the liquid conduit 15 can use a hose connection, or a hard tube connection. The cylinder 2 and the extended liquid container 17 can also be combined into one without using the liquid conduit 15 if the space allows.

[0035] As shown in Fig. 1, the linear displacement sensor 43 transmits and receives information through the wire 46 and the central control unit of the vehicle. The central control unit of the vehicle judges and adjusts the size of the electric control switch 16 according to the detected dynamic information of the vehicle body height, the vehicle body posture and the command information to change the damping of the suspension system, so as to achieve the control purpose.

[0036] The central control unit of the vehicle also calculates the instantaneous speed and direction of the piston 3 relative to the cylinder 2 according to the instantaneous position of the piston 3, and calculates the acceleration size. The central control unit makes a decision according to these information and the vehicle body posture information, and controls the damping of the vehicle suspension system 1 of the gas-liquid spring by controlling the opening size of the damping electric control valve 16, and controls the amount of liquid charging and discharging of the container 17 by the liquid valve 20, so as to control the height of the vehicle body.

[0037] The utility model discloses an external displacement sensor's vehicle suspension piston structure and vehicle suspension structure, and the both ends of the cylinder and the piston are connected to the vehicle body and the wheel axle respectively, and the central control unit judges and adjusts the size of the electric control switch according to the dynamic information of the piston head detected by the external displacement sensor, the vehicle body posture and the command information to change the damping of the suspension system, so as to achieve the control purpose.

[0038] The utility model is applicable to the wide range application from small and medium-sized vehicle to large heavy load vehicle. The utility model piston structure is mainly used for the suspension system of vehicle, can be hydraulic damper, can be hydraulic spring, can be air spring, also can be other hydraulic or pneumatic transmission device, and even can be the device used as displacement sensor alone without filling any gas or liquid. The inherent frequency of the vehicle equipped with the utility model changes little under the wide range of vehicle load, and the overall volume of the system is relatively compact.

[0039] The above only is the preferred implementation of the utility model, and it should be pointed out that for ordinary skilled person in the prior art, under the premise of not departing from the technical principle of the utility model, a plurality of improvements and deformations can be made, and these improvements and deformations also should be regarded as the protection scope of the utility model.

Claims

1. A piston structure for a vehicle suspension, characterized in that: Comprise: cylinder, piston, piston rod, cylinder body connecting shaft, piston rod connecting shaft and displacement sensor; Wherein, the piston is arranged in the cylinder, the piston rod is connected with the piston, the cylinder body connecting shaft is arranged at one end of the cylinder, the piston rod connecting shaft is arranged at the end of the piston rod, the cylinder body connecting shaft and the piston rod connecting shaft are respectively arranged at two ends of the cylinder, the cylinder body connecting shaft is connected with the wheel shaft, and the piston rod connecting shaft is connected with the vehicle body; One end of the displacement sensor is fixed with the outer wall of the cylinder, and the other end is a telescopic structure, the end of the telescopic structure is connected with the part of the piston rod outside the cylinder, so that the telescopic structure can follow the movement of the piston rod to obtain the movement state of the piston, and then the height of the vehicle body is calculated.

2. The piston structure for a vehicle suspension according to claim 1, wherein The displacement sensor uses LVDT sensor or LVIT sensor.

3. The piston structure for a vehicle suspension according to claim 1, wherein The displacement sensor is an inductance linear displacement sensor, the linear displacement sensor is arranged parallel to the outer wall of the cylinder, and the telescopic structure of the linear displacement sensor is consistent with the movement direction of the piston rod.

4. The piston structure for a vehicle suspension according to claim 1, wherein The end of the telescopic structure is connected with the part of the piston rod outside the cylinder through the connecting piece.

5. The piston structure for a vehicle suspension according to claim 1, characterized by Further comprising: Piston guide, arranged at the bottom of the cylinder, and the piston rod is arranged on the piston guide.

6. The piston structure for a vehicle suspension according to claim 1, characterized by Further comprising: Dust cover, sleeved on the bottom of the cylinder and the outside of the piston rod.

7. A vehicle suspension structure characterized by comprising: The piston structure for vehicle suspension according to any one of claims 1-6 is connected with an expansion liquid container through a liquid damping electric control valve; An air bag is arranged in the expansion liquid container, and an inflation valve of the air bag is mounted on the expansion liquid container; the air bag can be inflated to form an internal gas space; the expansion liquid container has a liquid space inside the container; The displacement sensor is connected with a central control unit, and the central control unit is connected with the liquid damping electric control valve.

8. The vehicle suspension structure of claim 7, wherein The expansion liquid container is further connected with a liquid valve, and the liquid valve is externally connected with a liquid filling and discharging conduit; The central control connection unit is connected with the displacement sensor and the liquid valve, so as to control the height of the vehicle.

9. The vehicle suspension structure of claim 7, wherein One or more liquid guide grooves are arranged in the expansion liquid container, and the liquid guide grooves are used for guiding the solution at both ends of the inner cavity of the expansion liquid container.

10. The vehicle suspension structure of claim 7, wherein Further comprising: The liquid conduit is used for connecting the inner cavity of the cylinder with the expansion liquid container through the liquid damping electric control valve.

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