Vehicle suspension piston structure having built-in displacement sensor and vehicle suspension structure thereof

Abstract

A vehicle suspension piston structure having a built-in displacement sensor and a vehicle suspension structure thereof. The piston structure comprises: an air cylinder, a piston, a piston rod, an air cylinder body connecting shaft, a piston rod connecting shaft, and a displacement sensor. The piston is arranged in the air cylinder. The piston rod is connected to the piston. The air cylinder body connecting shaft is arranged at one end of the air cylinder. The piston rod connecting shaft is arranged at an end of the piston rod. The air cylinder body connecting shaft and the piston rod connecting shaft are respectively located at the two ends of the air cylinder. The air cylinder body connecting shaft is connected to a wheel shaft. The piston rod connecting shaft is connected to a vehicle body. One end of the displacement sensor is fixed in an inner cavity of the air cylinder facing the top of the piston. A cavity is formed in the center of the piston. The cavity is matched with the position of a probe of the displacement sensor, so that when the piston reciprocates, a probe of the displacement sensor can enter and exit the cavity to obtain a motion state of the piston, thus a vehicle body height of the vehicle can be calculated.

Description

Piston structure for vehicle suspension with built-in displacement sensor and vehicle suspension structure thereof TECHNICAL FIELD

[0001] The utility model relates to vehicle suspension technology of vehicle, especially in a kind of piston structure for vehicle suspension with built-in 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 CONTENT

[0004] The utility model aims at providing a kind of piston structure for vehicle suspension with built-in 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 located at both ends of cylinder respectively, cylinder body connecting shaft is connected with wheel shaft, and piston rod connecting shaft is connected with vehicle body;The top end of displacement sensor is fixed in the inner cavity of cylinder and faces piston, the center of piston is provided with cavity, the position of cavity is matched with the position of probe of displacement sensor, so that the probe of displacement sensor can enter and exit in cavity when piston does reciprocating motion, to obtain the motion state of piston, and then the height of vehicle body is calculated.

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

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

[0008] According to an embodiment of the piston structure for vehicle suspension of the utility model, the cavity is in strip shape, and the length direction of cavity is consistent with the motion direction of piston.

[0009] According to an embodiment of the vehicle suspension piston structure of the utility model, further comprising: a piston guide rail, arranged at the bottom of the cylinder, and a piston rod arranged on the piston guide rail.

[0010] According to an embodiment of the vehicle suspension piston structure of the utility model, further comprising: a dust cover, sleeved on the bottom of the cylinder and the outer side of the piston rod.

[0011] The utility model relates to a kind of vehicle suspension structures, wherein, including the vehicle suspension piston structure of above-mentioned, the vehicle suspension piston structure is connected expansion liquid container by a 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.

[0012] According to an embodiment of the vehicle suspension structure of the utility model, wherein expansion liquid container is further connected with liquid valve, and liquid valve is connected with liquid filling and discharging pipe;Central control connects displacement sensor and liquid valve, to control the height of vehicle further.

[0013] According to an embodiment of the vehicle suspension structure of the utility model, wherein expansion liquid container is provided with one or more liquid guide grooves, and liquid guide groove is used for the solution flow guide of the inner chamber both ends of expansion liquid container.

[0014] According to an embodiment of the vehicle suspension structure of the utility model, further comprising: liquid pipe, and the inner chamber of cylinder is communicated with expansion liquid container by liquid pipe and damping electric control valve.

[0015] In conclusion, the utility model vehicle suspension piston structure with built-in 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 DRAWINGS

[0016] Fig. 1 is the principle diagram of the utility model vehicle suspension structure. DETAILED DESCRIPTION

[0017] In order to make the purpose, content and advantages of the utility model more clear, the specific embodiment of the utility model is described in detail below combined with drawings and examples.

[0018] Figure 1 is a schematic diagram of a vehicle suspension structure, as shown in Figure 1, the vehicle suspension structure includes a piston structure part, specifically comprising: the cylinder 2 is provided with a piston 3, a piston rod 4, a cylinder body connecting shaft 5, a piston rod connecting shaft 6, a piston guide rail 9, a displacement sensor 44. Among them, one end of the piston rod 4 is connected with the piston 3, the piston rod connecting shaft 6 is arranged at the other end of the piston rod, the piston 3 divides the internal space of the cylinder 2 into the cylinder cavity space 7 and the cylinder cavity space 8. The cylinder body connecting shaft 5 is arranged 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 both ends of the cylinder 2. The piston guide rail 9 is arranged at the bottom of the cylinder 2, and the piston rod 4 is arranged on the piston guide rail 9.

[0019] As shown in Figure 1, wherein the displacement sensor 44 adopts a linear displacement sensor in the cylinder 2, and the electronic excitation and processing device 45 of the inductance displacement sensor is fixed in the cylinder cavity 7 facing the top end of the piston 3. The center of the piston 3 has a cavity 47, the position of the sensor probe 48 matches the cavity 47, and the length direction of the cavity 47 is consistent with the piston movement direction, so that the sensor probe 48 can freely enter and exit the cavity 47 when the piston 3 reciprocates. In the process of the probe 44 entering and exiting the cavity 47, the liquid in the cavity 47 can enter and exit without obstruction.

[0020] As shown in Figure 1, the displacement sensor 44 uses an LVDT sensor or an LVIT sensor.

[0021] As shown in Figure 1, the cylinder body connecting shaft 5 connects the wheel shaft, and the piston rod connecting shaft 6 is connected with the vehicle body. Thus, the measurement of the position of the piston 3 directly obtains the height of the vehicle body at this corner.

[0022] As shown in Figure 1, 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.

[0023] As shown in Figure 1, the expansion liquid container 17 is provided with an air bag 18, and an air bag inflation valve 19 of the air bag 18 is installed on the cavity wall of the expansion liquid container 17. The air bag 18 can be inflated to form an internal gas space 27. The expansion liquid container 17 has a container internal liquid space 26.

[0024] As shown in Figure 1, for a preferred embodiment, the expansion liquid container 17 is provided with a liquid guide groove 23, which is used for guiding the liquid at both ends of the expansion liquid container 17, so as to prevent the liquid flow at both ends of the expansion liquid container 17 from being blocked after the air bag 18 expands. Specifically, the liquid guide groove 23 can be one or more, so that the liquid can still flow flexibly in the container 17 after the air bag 18 expands.

[0025] As shown in Fig. 1, the cylinder chamber 7 is connected to the expansion liquid container 17 through the liquid conduit 15 and the damping electronically controlled valve 16. The liquid conduit 15 has an internal space 25 for liquid to pass through. The liquid conduit 15 is connected to the container internal liquid space 26 of the expansion liquid container 17 through the damping electronically controlled valve 16. The damping electronically controlled valve 16 has a damping electronically controlled valve wire for connecting external power supply and signal transmission. The damping electronically controlled valve 16 is used to adjust the damping of the piston by controlling the flow of the piston and the expansion liquid container 17 liquid, cooperating with the air bag 18, to control the stiffness of the vehicle.

[0026] As shown in Fig. 1, since the cylinder and the piston are connected to the vehicle body and the wheel axle through the cylinder body connecting shaft 5 and the piston rod connecting shaft 6 respectively, the instantaneous change of the vehicle body height is detected. Specifically, the cylinder body connecting shaft 5 and the piston rod connecting shaft 6 of the cylinder and the piston can be connected to the wheel axle and the vehicle body respectively through a lever.

[0027] As shown in Fig. 1, the air bag 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.

[0028] 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.

[0029] In fact, the damping electronically controlled valve 16 can be installed at any position between the cylinder 2, the expansion liquid container 17 or the liquid conduit 15. The damping electronically controlled valve 16 adjusts the size of the opening to control the amount of liquid passing through, thereby controlling the flow damping of the liquid. Further, the electronically controlled valve 16 can be pre-arranged with a minimum flow passage to ensure that there is still a minimum fluid intercommunication when the electronically controlled valve 16 is opened to the minimum. The damping electronically controlled valve 16 can be implemented in various ways, such as using a solenoid valve, a rotary or linear motor, etc.

[0030] As shown in Fig. 1, the expansion liquid container 17 is connected with a liquid valve 20, which has a valve switch and is connected with a liquid charging and discharging conduit, through which the liquid of the expansion liquid container 17 can be charged or discharged.

[0031] 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.

[0032] As shown in Fig. 1, the liquid conduit 15 can be connected by a hose or a hard pipe. The cylinder 2 and the expansion liquid container 17 can also be combined into one without using the liquid conduit 15 if the space allows.

[0033] As shown in Fig. 1, the piston extension sensor 44 transmits and receives information through a wire 46 and a central control unit of the vehicle. The central control unit of the vehicle judges and adjusts the size of the electric control switch 16 to change the damping of the suspension system according to the detected dynamic information of the vehicle body height, the posture of the vehicle body and the command information, so as to achieve the control purpose.

[0034] 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 posture information of the vehicle body, and controls the damping of the vehicle suspension system 1 of the hydro-pneumatic spring by controlling the opening size of the damping electric control valve 16, and controls the amount of liquid filled and discharged by the liquid valve 20 to the container 17, so as to control the height of the vehicle body.

[0035] The utility model discloses a built-in displacement sensor's vehicle suspension piston structure and vehicle suspension structure, and the both ends of cylinder and 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 to change the damping of the suspension system according to the detected dynamic information of the piston head, the posture of the vehicle body and the command information, so as to achieve the control purpose.

[0036] The utility model is suitable for a wide range of applications from small and medium-sized vehicles to large heavy-duty vehicles. The piston structure of the utility model is mainly used for the suspension system of the vehicle, which can be a hydraulic damper, a hydraulic spring, an air spring or other hydraulic or pneumatic transmission devices, and even can be a device used as a displacement sensor without filling any gas or liquid. The vehicle equipped with the utility model has a small change in natural frequency under a wide range of vehicle loads, and the overall volume of the system is relatively compact.

[0037] The above only is the preferred implementation of the utility model, and it should be pointed out that for ordinary skilled person in the art, under the premise of not departing from the technical principle of the utility model, can make a number of improvements and deformations, 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; The displacement sensor is fixed at the top end of the inner cavity of the cylinder facing the piston, the center of the piston is provided with a cavity, the position of the cavity matches the position of the probe of the displacement sensor, so that when the piston reciprocates, the probe of the displacement sensor can enter and exit the cavity to obtain the motion 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 piston stretch sensor uses an LVDT sensor or an LVIT sensor.

3. The piston structure for a vehicle suspension according to claim 1, wherein The displacement sensor is an inductance linear displacement sensor, and the electronic excitation and processing device of the inductance displacement sensor is fixed at the top end of the inner cavity of the cylinder facing the piston.

4. The piston structure for a vehicle suspension according to claim 1, wherein The cavity is in the form of a strip, and the length direction of the cavity is consistent with the motion direction of the piston.

5. The piston structure for a vehicle suspension according to claim 1, characterized by Further comprising: The piston guide is 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: The dust cover is sleeved on the bottom of the cylinder and the outer side of the piston rod.

7. A vehicle suspension structure characterized by comprising: The vehicle suspension piston structure according to any one of claims 1-6 is connected with an expansion liquid container through a liquid damping electric control valve; The expansion liquid container is provided with an air bag, and the 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 in 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 unit is connected with the displacement sensor and the liquid valve, thereby controlling the height of the vehicle.

9. The vehicle suspension structure of claim 7, wherein The expansion liquid container is provided with one or more liquid guide grooves 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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