Automobile steering piston rod

Abstract

This utility model relates to an automotive steering piston rod, comprising a cylinder and a rod. The cylinder has an internal cavity with channels at both ends extending to the cylinder's ends. The rod passes through these channels. A guide strip is embedded in the inner wall of the cavity. A piston is located in the middle of the rod, with a notch on its edge matching the guide strip. The piston is slidably connected to the inner wall of the cavity. Hydraulic oil holes are located on the side of the cylinder, communicating with the cavity. Both ends of the guide strip extend into the end walls of the cavity, and wires are attached to the ends of the guide strips, extending from the side of the cylinder. A conductive piece is located in the notch, contacting the guide strip. The advantages of this utility model are: the first guide strip, the second guide strip, and the piston form a sliding rheostat; the state of the steering piston rod can be detected by monitoring the voltage on the wires led out from the second guide strip; the guide strip guides the rod, ensuring that the rod's movement direction is horizontal to the channel extension direction, reducing the rod's movement resistance.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering systems, and more particularly to an automotive steering piston rod. Background Technology

[0002] The steering piston rod is an important component of the car's steering system, which is driven by hydraulic fluid to provide steering assistance.

[0003] With the development of new energy vehicles, vehicle systems are becoming increasingly intelligent. In order to accurately grasp the vehicle status, each component needs to have a certain information feedback function. However, the existing steering piston rod does not have an information feedback function and can only roughly estimate the status of the steering piston rod by relying on the distribution of hydraulic oil in the steering system. Summary of the Invention

[0004] This invention mainly solves the above-mentioned problems by providing an automotive steering piston rod with information feedback function, which can accurately obtain the operating status.

[0005] The technical solution adopted by this utility model to solve its technical problem is an automotive steering piston rod, including a cylinder and a rod. The cylinder has a cavity inside, and channels are provided at both ends of the cavity. The channels extend to both ends of the cylinder. The rod passes through the channels. A guide strip is embedded in the inner wall of the cavity. A piston is provided in the middle of the rod. The piston edge is provided with a notch that matches the guide strip. The piston is slidably connected to the inner wall of the cavity. A hydraulic oil hole is provided on the side of the cylinder and is connected to the cavity. The two ends of the guide strip extend into the end wall of the cavity. A wire is provided at the end of the guide strip and extends from the side of the cylinder. A conductive piece is provided in the notch that contacts the guide strip.

[0006] As a preferred embodiment of the above solution, an oil seal is provided at the junction of the cavity and the channel.

[0007] As a preferred embodiment of the above solution, the guide bar is provided with at least two bars, including a first guide bar and a second guide bar. The first guide bar has wires at both ends, and the second guide bar has a wire at one end, which is connected to the conductive sheet in the notch corresponding to the first guide bar and the conductive sheet in the notch corresponding to the second guide bar.

[0008] As a preferred embodiment of the above solution, the conductivity of the guide strip is greater than that of the cylinder body.

[0009] As a preferred embodiment of the above solution, dust covers are provided at both ends of the cylinder body.

[0010] The advantages of this utility model are: a sliding rheostat is formed by a first guide bar, a second guide bar, and a piston; the state of the steering piston rod can be detected by detecting the voltage of the wire led out from the second guide bar; the guide bar can guide the rod body to ensure that the direction of rod body movement is horizontal with the direction of channel extension, thereby reducing the resistance of rod body movement. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the automotive steering piston rod in the embodiment.

[0012] Figure 2 This is a cross-sectional view of the steering piston rod in the embodiment.

[0013] Figure 3 This is a side view of the rod structure.

[0014] 1-Cylinder body 2-Rod body 3-Dust cover 4-Wire 5-Hydraulic oil hole 6-Cavity 7-Guide bar 8-Piston 9-Oil seal 10-Notch Detailed Implementation

[0015] The technical solution of this utility model will be further described below through embodiments and in conjunction with the accompanying drawings.

[0016] Example:

[0017] This embodiment describes a car steering piston rod, such as... Figures 1 to 3 As shown, the device includes a cylinder body 1 and a rod body 2. Dust covers 3 are provided at both ends of the cylinder body. A cavity 6 is provided inside the cylinder body 1. Channels are provided at both ends of the cavity 6, extending to both ends of the cylinder body 1. The rod body 2 passes through the channels. An oil seal 9 is provided at the junction of the cavity and the channel. A guide strip 7 is embedded in the inner wall of the cavity 6. A piston 8 is provided in the middle of the rod body 2. A notch 10 matching the guide strip 7 is provided on the edge of the piston 8. The piston 8 is slidably connected to the inner wall of the cavity. The piston 8 divides the cavity into left and right chambers. A first hydraulic oil hole and a second hydraulic oil hole are provided on the side of the cylinder body 1. The first hydraulic oil hole is connected to the left chamber, and the second hydraulic oil hole is connected to the right chamber. By controlling the amount of hydraulic oil in the left and right chambers, the piston can slide left and right, thereby causing the rod body to slide left and right to provide steering assistance.

[0018] Furthermore, the guide strip 7 extends into the end wall of the cavity 6 at both ends. At least two guide strips 7 are provided, including a first guide strip and a second guide strip. Both ends of the first guide strip are provided with wires, and one end of the second guide strip is provided with a wire extending from the side of the cylinder. A conductive piece is provided in the notch 10 to connect with the guide strip. The notch has two sections: a first notch corresponding to the first guide strip and a second notch corresponding to the second guide strip. The conductive piece in the first notch is connected to the conductive piece in the second notch. In this embodiment, the conductive piece is embedded in the middle of the notch, and during piston sliding, the conductive piece always abuts against the guide strip. The conductive pieces between the two notches are connected by a wire built into the piston.

[0019] Specifically, the conductivity of guide strip 7 is greater than that of cylinder 1. In this embodiment, the cylinder is made of steel, and the guide strip is made of copper, aluminum, iron, or other materials. During use, the wires at both ends of the first guide strip are connected to the positive and negative terminals of a 5V, 12V, or 24V power supply, respectively, and the voltage value of the wires leading out from the second guide strip is detected. Ideally, assuming the voltage difference between the two ends of the first guide strip is 12V, then when the piston 8 is centered, the voltage detected at the wire of the second guide strip should be 6V. That is, the first guide strip, the second guide strip, and the piston form a sliding rheostat. By detecting the voltage, the position of the piston can be accurately obtained, thereby obtaining the working state of the steering piston rod, enabling the vehicle system to accurately obtain the state of the steering piston rod. Although the cylinder is made of steel and has a certain conductivity, its conductivity is poor compared to materials such as copper, aluminum, and iron. That is, the resistance of the cylinder is significantly greater than that of the guide strip. Therefore, the current will preferentially flow through the guide strip piston and will not flow in the cylinder. In addition, an insulating layer can be set between the guide strip and the cylinder to block the current from flowing in the cylinder.

[0020] Furthermore, while hydraulic oil is normally an insulating substance, over time, wear on the cylinder and rod produces metal debris. This increased metal debris causes the hydraulic oil to become conductive instead of insulating, leading to errors in the voltage detected at the second guide bar. In this embodiment, the piston position can be obtained by forming a sliding rheostat using the first guide bar, second guide bar, and piston. Alternatively, the piston position can be roughly determined by the distribution of hydraulic oil in the left and right chambers. Normally, the two methods will not show a significant difference in piston position. However, if there is a large amount of metal debris in the hydraulic oil, the two methods may result in a significant difference in the detected piston position. In such cases, the steering hydraulic oil needs to be replaced. Therefore, the steering piston rod in this embodiment can also work with the vehicle's infotainment system to provide a steering hydraulic oil replacement reminder function.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A car steering piston rod, characterized in that: The device includes a cylinder and a rod. The cylinder has an internal cavity with channels at both ends extending to both ends of the cylinder. The rod passes through the channels. A guide strip is embedded in the inner wall of the cavity. A piston is located in the middle of the rod. The piston edge has a notch that matches the guide strip. The piston is slidably connected to the inner wall of the cavity. A hydraulic oil hole is located on the side of the cylinder and communicates with the cavity. Both ends of the guide strip extend into the end wall of the cavity. A wire is located at the end of the guide strip and extends from the side of the cylinder. A conductive piece is located in the notch that contacts the guide strip.

2. The automotive steering piston rod according to claim 1, characterized in that: An oil seal is provided at the junction of the cavity and the channel.

3. The automotive steering piston rod according to claim 1, characterized in that: The guide bar has at least two parts, including a first guide bar and a second guide bar. The first guide bar has wires at both ends, and the second guide bar has a wire at one end, which is connected to the conductive piece in the notch corresponding to the first guide bar and the conductive piece in the notch corresponding to the second guide bar.

4. The automotive steering piston rod according to claim 3, characterized in that: The conductivity of the guide strip is greater than that of the cylinder body.

5. The automotive steering piston rod according to claim 1, characterized in that: Dust covers are provided at both ends of the cylinder.

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