KR-102962316-B1 - APPARATUS FOR MOUNTING ROD END AND METHOD FOR PREDICTING LIFE THEREOF

KR102962316B1KR 102962316 B1KR102962316 B1KR 102962316B1KR-102962316-B1

Abstract

The present invention relates to a mounting device for a rod end and a method for predicting the lifespan thereof, which, when applied to, for example, a vehicle suspension system, can ensure robustness and monitor loads and moments acting on the rod in real time. A mounting device for a rod end according to one embodiment may include: a mounting bracket that is fixedly installed on a vehicle and has a first receiving groove formed therein that at least partially receives a pin portion of a rod end provided on a rod; a clamp coupled to the mounting bracket to cover the first receiving groove and the pin portion; and a plurality of pressure sensors installed within the first receiving groove to detect a force applied by the pin portion.

Inventors

손태영

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260508
Application Date: 20211018

Claims (12)

A mounting bracket that is fixedly installed on a vehicle and has a first receiving groove formed therein that at least partially receives a pin portion of a rod end provided on a rod; A clamp coupled to the mounting bracket to cover the first receiving groove and the pin portion; and A plurality of pressure sensors installed within the first receiving groove and detecting the force acting on the rod A mounting device for a load end including
In paragraph 1, The above mounting bracket is, A fixing part fixed to the body of the above vehicle, and A pair of support members extending from the above-mentioned fixed part and arranged parallel to each other at a certain distance. Includes, The first receiving groove above is a mounting device for a rod end formed on one side of each support member.
In paragraph 2, A stepped seating groove is formed on one side of each support member, and The first receiving groove is formed in the seating groove, and The above clamp is a mounting device for a rod end that is fitted into the above seating groove by shape fitting.
In paragraph 3, A mounting device for a rod end that at least partially accommodates a pin portion of the rod end, wherein a second receiving groove is formed on the surface of the clamp facing the seating groove so as to correspond to the first receiving groove.
In paragraph 4, The inner surface of the first receiving groove and the inner surface of the second receiving groove are provided with a protective layer made of an elastic material, A mounting device for a rod end in which the pressure sensor is positioned between the protective layer and the inner surface of the first receiving groove, and between the protective layer and the inner surface of the second receiving groove.
In paragraph 5, The above protective layer is a mounting device for a rod end in which the tip of the opening is chamfered.
In paragraph 4, A mounting device for a rod end in which the pressure sensor is disposed on each of the mutually facing sides of the first receiving groove, and the pressure sensor is disposed on each of the mutually facing sides of the second receiving groove.
In paragraph 4, A mounting device for a rod end in which the pressure sensor is disposed on the upper surface of the first receiving groove and the pressure sensor is disposed on the bottom surface of the second receiving groove.
In paragraph 3, At least one pair of screw holes is formed in the support member with the first receiving groove in between, and A mounting device of a rod end having at least one pair of through holes formed in the clamp for connection with the support member by screw fastening.
In any one of paragraphs 5, 7, and 8, A mounting device for a rod end further comprising a control unit electrically connected to the pressure sensor to monitor the force acting on the rod and predict the lifespan of the mounting device.
A step of calculating the number of times a peak of force acting on a mounting device according to any one of claims 1 to 9 occurs in each influence section when the vehicle is driving on an actual road surface; A step of pre-determining the maximum stress value for each influence section of the force acting on the mounting device through analysis or testing; A step of obtaining data regarding the expected lifespan by reflecting the above maximum stress value in the SN curve of the part material; and A step of calculating a damage rate (D) using the number of times a force peak measured by the pressure sensor of the mounting device occurred in each influence section and the expected lifespan for the maximum stress value in each influence section. A method for predicting the lifespan of a mounting device including
In Paragraph 11, The above damage rate (D) is calculated by continuously updating information regarding damage through the linear cumulative damage theory expressed by the following equation, and [ceremony] Here, N i is the life at a specific stress range obtained from the SN curve, and n i represents the number of times the measured force peak repeats within a specific range when the vehicle is driving on an actual road surface, and A method for predicting the lifespan of a mounting device, wherein the point at which damage occurs is predicted when the value of the damage rate (D) above becomes 1.

Description

Apparatus for Mounting Rod End and Method for Predicting Life Thereof The present invention relates to a mounting device for a rod end and a method for predicting the lifespan thereof, which, when applied for example to a vehicle suspension system, ensures robustness and can monitor the load and moment acting on the rod in real time. In commercial vehicles, air suspension uses radius rods to maintain axle position and trajectory. These radius rods can be mounted using screws to mounting brackets welded to the vehicle body. However, since axial and lateral loads as well as torque in all directions act on the screws used to mount the rods, there is a high probability of loosening; in practice, screw failure frequently occurs during operation on harsh road surfaces or after accumulated use on such surfaces. Since the failure of the screws used to mount the rods can immediately cause the axle to detach, it can pose a serious safety risk to the vehicle. Accordingly, there is a need for a means to monitor the load, moment, etc. acting on the load in real time, thereby predicting the time of failure and detecting the possibility of the load detaching due to failure at an early stage to warn the driver. (Patent Document 1) KR 1028545 B1 FIG. 1 is a partial perspective view showing a rod mounted on a vehicle body by a rod end mounting device according to one embodiment of the present invention. Figure 2 is an exploded perspective view of the mounting device in Figure 1. Figure 3 is a perspective view illustrating a mounting bracket. Figure 4 is a perspective view illustrating a clamp. FIGS. 5 to 7 are drawings illustrating the operating state of the rod end in the mounting device. Figure 8 is a table showing pressure sensors that operate according to the movement of the vehicle. Figure 9 is a table illustrating the calculation of force according to the mode of force acting on the load. FIG. 10 is a drawing illustrating a key part of a mounting device for a rod end according to another embodiment of the present invention. FIG. 11 is a flowchart illustrating a method for predicting the lifespan of a mounting device according to the present invention. FIG. 12 is a graph illustrating data required for the method of predicting the lifespan of a mounting device according to the present invention. The present invention is described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. In this specification, terms such as first, second, third, etc. may be used to describe various components, but the order, size, location, or importance of these components is not limited by terms such as first, second, third, etc., and they are named solely for the purpose of distinguishing one component from another. In addition, terms used in relation to direction, such as "upper," "lower," "up and down," "left," "right," "front," "rear," and "front and back," are defined based on the vehicle or its body, that is, the object of installation. FIG. 1 is a partial perspective view showing a rod mounted on a vehicle body by a rod end mounting device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the mounting device in FIG. 1. FIG. 3 is a perspective view showing a mounting bracket, and FIG. 4 is a perspective view showing a clamp. In this specification, for convenience of explanation, the mounting device of the rod end is illustrated and described primarily with examples applied, for instance, to the radius rod of a vehicle, but the examples of application are not necessarily limited thereto. For example, rod ends (2) at both ends of a rod (1), such as a radius rod, are provided with mounting holes that are approximately cylindrical in shape, and a metal pin part (3) that is connected to a mounting bracket (10) described later is inserted into the mounting holes. The pin portion (3) is formed, for example, at least at its end in a roughly rectangular shape and extends to both sides of the rod end (2). And, a bushing (4), for example made of rubber, is interposed between the outer surface of the pin portion and the inner surface of the mounting hole. These radius rods can maintain the alignment angle of the axle against forces generated during braking and acceleration of the vehicle, and support forces in the front-rear direction of the vehicle. As illustrated in FIGS. 1 to 3, a mounting device for a rod end according to one embodiment of the present invention may include a mounting bracket (10), a clamp (20), and a plurality of pressure sensors (30). A mounting bracket (10) may include a fixing part (11) fixed to the body of a vehicle, a pair of supporting parts (12) extending from the fixing part and arranged parallel to each other at a certain distance, and a first receiving groove