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

Abstract

The utility model relates to a piston structure for a vehicle suspension with a built-in displacement sensor and a vehicle suspension structure thereof. The piston structure is characterized in that a piston is arranged in an air cylinder, a piston rod is connected with the piston, an air cylinder body connecting shaft is arranged at one end of the air cylinder, and a piston rod connecting shaft is arranged at the end part of the piston rod; the cylinder body connecting shaft and the piston rod connecting shaft are located at the two ends of the cylinder respectively, the cylinder body connecting shaft is connected with the wheel axle, and the piston rod connecting shaft is connected with the vehicle body; one end of the displacement sensor is fixed to the top end, facing the piston, in an inner cavity of the air cylinder, a cavity is formed in the center of the piston, and the cavity is matched with a probe of the displacement sensor in position, so that when the piston reciprocates, the probe of the displacement sensor can enter and exit from the cavity to obtain the motion state of the piston, and then the vehicle body height of the vehicle is calculated. According to the dynamic information of the piston head detected by the sensor arranged in the piston, the purpose of controlling the vehicle suspension is achieved.

Description

Technical Field

[0001] The utility model relates to a vehicle suspension technology of a vehicle, in particular to a piston structure for a vehicle suspension with a built-in displacement sensor and a vehicle suspension structure thereof. Background Art

[0002] Vehicles are inseparable from the suspension system. The existing suspension system is generally composed of a spring unit and a damping unit. Real-time control of the damping according to the road conditions and adjustment of part or all of the vehicle height can improve the comfort, stability and safety of the vehicle. Among them, obtaining vehicle height information at any time is a necessary link in the perception and control system of the entire system. Most of the existing technologies use a height sensor installed on the vehicle to measure the vehicle height, and then electronically control the spring unit and the damping unit, but the existing technology has the problems of high cost, complex system and high error probability. Utility Model Content

[0003] The utility model aims to provide a piston structure for a vehicle suspension with a built-in displacement sensor and a vehicle suspension structure thereof, so as to solve the above-mentioned problems of the prior art.

[0004] The utility model discloses a piston structure for a vehicle suspension, which comprises: a cylinder, a piston, a piston rod, a cylinder body connecting shaft, a piston rod connecting shaft and a displacement sensor; wherein 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 the 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 the wheel shaft, and the piston rod connecting shaft is connected to the vehicle body; one end of the displacement sensor is fixed in the inner cavity of the cylinder facing the top end of the piston, a cavity is opened in the center of the piston, and the position of the cavity matches that of a probe of the displacement sensor, so that when the piston makes a reciprocating motion, the probe of the displacement sensor can move in and out of the cavity to obtain the motion state of the piston, and then calculate the vehicle body height.

[0005] According to an embodiment of the piston structure for vehicle suspension of the utility model, the piston tension sensor uses an LVDT sensor or a LVIT sensor.

[0006] According to an embodiment of the piston structure for vehicle suspension of the utility model, the displacement sensor is an inductive linear displacement sensor, and the electronic excitation and processing device of the inductive displacement sensor is fixed in the cylinder cavity facing the top end of the piston.

[0007] According to an embodiment of the piston structure for a vehicle suspension of the utility model, the cavity is strip-shaped, and the length of the cavity is consistent with the movement direction of the piston.

[0008] According to an embodiment of the piston structure for vehicle suspension of the utility model, it further comprises: a piston guide rail arranged at the bottom of the cylinder, and a piston rod arranged on the piston guide rail.

[0009] According to an embodiment of the piston structure for vehicle suspension of the utility model, it also includes: a dust cover, which is sleeved on the bottom of the cylinder and the outer side of the piston rod.

[0010] The utility model provides a vehicle suspension structure, which includes the above-mentioned piston structure for vehicle suspension, wherein the piston structure for vehicle suspension is connected to an extended liquid container via a liquid damping electrically controlled valve; an air bag is arranged in the extended liquid container, and an inflation valve of the air bag is installed on the extended liquid container; the air bag can be inflated to form an internal gas space; the extended liquid container has an internal liquid space of the container; a displacement sensor is connected to a central control unit, and the central control unit is connected to the liquid damping electrically controlled valve.

[0011] According to an embodiment of the vehicle suspension structure of the utility model, the extended liquid container is also connected to a liquid valve, and the liquid valve is externally connected to a liquid filling and discharging conduit; the central control connects the displacement sensor and the liquid valve, thereby controlling the height of the vehicle.

[0012] According to an embodiment of the vehicle suspension structure of the utility model, one or more liquid guide grooves are provided in the extended liquid container, and the liquid guide grooves are used to guide the solution at both ends of the inner cavity of the extended liquid container.

[0013] According to an embodiment of the vehicle suspension structure of the utility model, it also includes: a liquid conduit, and the inner cavity of the cylinder is connected to the expansion liquid container through the liquid conduit and the damping electric control valve.

[0014] In summary, the utility model has a piston structure for a vehicle suspension with a built-in displacement sensor and a vehicle suspension structure thereof, wherein the two ends of the cylinder and the piston are respectively connected to the vehicle body and the wheel axle, and the central control unit judges and adjusts the size of the electronically controlled switch based on the dynamic information of the piston head detected by the displacement sensor arranged in the piston, the comprehensive vehicle posture and command information, so as to change the damping of the suspension system and achieve the purpose of controlling the vehicle suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of a vehicle suspension structure. DETAILED DESCRIPTION

[0016] In order to make the purpose, content, and advantages of the utility model clearer, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of a vehicle suspension structure of the utility model, such as Figure 1 As shown, the vehicle suspension structure includes a piston structure, specifically including: 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 displacement sensor 44 are arranged in the cylinder 2. Among them, one end of the piston rod 4 is connected to the piston 3, and 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 a cylinder inner cavity space 7 and a cylinder outer 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 the two 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.

[0018] like Figure 1 As shown, the displacement sensor 44 adopts a linear displacement sensor in the cylinder 2, and the electronic excitation and processing device 45 of the inductive displacement sensor is fixed in the cylinder cavity 7 facing the top of the piston 3. There is a cavity 47 in the center of the piston 3, and the position of the cavity 47 matches the position of the sensor probe 48. The length of the cavity 47 is consistent with the movement direction of the piston, so that when the piston 3 reciprocates, the sensor probe 48 can freely enter and exit the cavity 47. In the process of the probe 44 entering and exiting the cavity 47, the liquid in the cavity 47 can enter and exit unhindered.

[0019] like Figure 1 As shown, the displacement sensor uses an LVDT sensor or an LVIT sensor.

[0020] like Figure 1 As shown, the cylinder connecting shaft 5 is connected to the wheel shaft, and the piston rod connecting shaft 6 is connected to the vehicle body. Thus, the measurement of the position of the piston 3 will directly obtain the vehicle body height at this angle.

[0021] like Figure 1 As shown, 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.

[0022] like Figure 1 As shown, an airbag 18 is arranged in the expansion liquid container 17, and an airbag inflation valve 19 of the airbag 18 is installed 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 of the container.

[0023] like Figure 1As shown, for a preferred embodiment, a liquid guide groove 23 is provided in the expansion liquid container 17, and the liquid guide groove 23 is used to guide the solution at both ends of the expansion liquid container 17 to prevent the airbag 18 from blocking the flow of liquid at both ends of the expansion liquid container 17 after the expansion. Specifically, there can 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.

[0024] like Figure 1 As shown, the cylinder cavity 7 is connected to the extended liquid container 17 through the liquid conduit 15 and the damping electric control valve 16. The liquid conduit 15 has an internal space 25 for liquid to pass through. The liquid conduit 15 is connected to the internal liquid space 26 of the extended liquid container 17 through the damping electric control valve 16. The damping electric control valve 16 has a wire of the damping electric control valve to connect external power supply and signal transmission. The damping electric control valve 16 is used to adjust the damping of the piston by controlling the flow of liquid in the piston and the extended liquid container 17, in cooperation with the airbag 18, to control the rigidity of the vehicle.

[0025] like Figure 1 As shown, since the cylinder and the piston are connected to the vehicle body and the axle through the cylinder body connecting shaft 5 and the piston rod connecting shaft 6, respectively, it is equivalent to detecting the instantaneous change of the vehicle body height. 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 axle and the vehicle body respectively through a lever.

[0026] like Figure 1 As shown, 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.

[0027] like Figure 1 As shown, the dust cover 14 is sleeved on the bottom of the cylinder 2 and the outer side of the piston rod 4.

[0028] In fact, the damping electric control valve 16 can be installed at any position between the cylinder 2, the extended liquid container 17 or the liquid conduit 15. The damping electric control 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 electric control valve 16 can reserve a minimum flow passage in advance to ensure that when the electric control valve 16 is opened to the minimum, the minimum fluid communication can still be maintained. The damping electric control valve 16 can be implemented in a variety of ways, such as using a solenoid valve, a rotary or linear motor, etc.

[0029] like Figure 1 As shown, the extended liquid container 17 is connected to a liquid valve 20, the liquid valve 20 has a valve switch, and the liquid valve 20 is externally connected to a liquid filling and discharging conduit, through which the liquid in the extended liquid container 17 can be filled and discharged.

[0030] like Figure 1 As shown, the gas in the airbag 18 can use air, or can use inert gas nitrogen or argon. These gases are in a pressurized state under normal use.

[0031] like Figure 1 As shown, the liquid conduit 15 can be connected by a hose or a hard pipe. The cylinder 2 and the expansion liquid container 17 can be combined into one without the liquid conduit 15 if space permits.

[0032] like Figure 1 As shown, the piston extension sensor 44 transmits and receives information and is connected to the central control unit of the vehicle through a wire 46. 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 height, the vehicle posture and the command information to change the damping of the suspension system to achieve the purpose of control.

[0033] 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 magnitude of the acceleration. The central control unit makes decisions based on this information and the vehicle 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 filling and discharge amount of the liquid to the container 17 through the liquid valve 20 to control the height of the vehicle body.

[0034] The utility model discloses a piston structure for a vehicle suspension with a built-in displacement sensor and a vehicle suspension structure thereof, wherein both ends of a cylinder and a piston are respectively connected to a vehicle body and a wheel axle, and a central control unit judges and adjusts the size of an electric control switch according to detected dynamic information of a piston head, a comprehensive vehicle body posture and command information to change the damping of a suspension system, thereby achieving a control purpose.

[0035] The utility model is suitable for a wide range of applications from small and medium-sized vehicles to large heavy-load vehicles. The piston structure of the utility model is mainly used in 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, or even a device used alone as a displacement sensor without filling any gas or liquid. The natural frequency of the vehicle equipped with the utility model changes little under a wide range of vehicle loads, and the overall volume of the system is relatively compact.

[0036] 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 protection scope of the present invention.

Claims

1. A piston structure for a vehicle suspension, characterized in that: include: Cylinder, piston, piston rod, cylinder body connecting shaft, piston rod connecting shaft and 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 the 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 the wheel shaft, and the piston rod connecting shaft is connected to the vehicle body; One end of the displacement sensor is fixed in the inner cavity of the cylinder facing the top of the piston. A cavity is opened in the center of the piston. The cavity matches the position of the displacement sensor probe, so that when the piston reciprocates, the displacement sensor probe can move in and out of the cavity to obtain the movement state of the piston and then calculate the vehicle body height.

2. The vehicle suspension piston structure according to claim 1, characterized in that: The piston stretch sensor uses an LVDT sensor or a LVIT sensor.

3. The vehicle suspension piston structure according to claim 1, characterized in that: The displacement sensor is an inductive linear displacement sensor, and the electronic excitation and processing device of the inductive displacement sensor is fixed in the inner cavity of the cylinder facing the top end of the piston.

4. The piston structure for a vehicle suspension according to claim 1, characterized in that: The cavity is strip-shaped, and the length of the cavity is consistent with the movement direction of the piston.

5. The piston structure for vehicle suspension according to claim 1, characterized in that: Also includes: The piston guide rail is arranged at the bottom of the cylinder, and the piston rod is arranged on the piston guide rail.

6. The piston structure for a vehicle suspension according to claim 1, characterized in that: Also includes: 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 in that: The vehicle suspension piston structure comprises the vehicle suspension piston structure according to any one of claims 1 to 6, wherein the vehicle suspension piston structure is connected to an expansion liquid container via a liquid damping electric control valve; An air bag is arranged in the expanded liquid container, and an inflation valve of the air bag is installed on the expanded liquid container; the air bag can be inflated to form an internal gas space; the expanded liquid container has an internal liquid space of the container; The displacement sensor is connected to a central control unit, and the central control unit is connected to the liquid damping electric control valve.

8. The vehicle suspension structure according to claim 7, characterized in that: The extended liquid container is also connected to a liquid valve, and the liquid valve is externally connected to a liquid filling and discharging conduit; The central control connects the displacement sensor and the liquid valve to control the height of the vehicle.

9. The vehicle suspension structure according to claim 7, characterized in that: One or more liquid guide grooves are arranged in the extended liquid container, and the liquid guide grooves are used to guide the solution at both ends of the inner cavity of the extended liquid container.

10. The vehicle suspension structure according to claim 7, characterized in that: Also includes: The liquid conduit, the inner cavity of the cylinder is connected with the expansion liquid container through the liquid conduit and the damping electric control valve.

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