KR100405562B1 - Excitement force measuring device of a body of car - Google Patents

Abstract

The present invention is a vehicle in which the driving force is transmitted from the road surface or the engine to the vehicle body via the trailing arm, rubber bush, rubber bush inner pipe, bracket, the vertical direction (Fz) between the bush inner pipe 11 and the bracket 40 And a three-axis washer-type force sensor 50 for measuring the force in the horizontal direction (Fx) and the longitudinal direction (Fy), wherein the bracket is used for storing the holes 41a and 42a for fastening, respectively. It consists of the bracket 41 and the fastening bracket 42, the two three-axis washer-type sensor 50, which is stored in the innermost of the bracket (41, 42), the sensor 50 is bracket (41, 42) Preload plate 60 for preloading), bush inner pipe 11 supporting the preload plate, bush 10 mounted in a shape surrounding the bush inner pipe 11, and bush appearance 12 surrounding the bush 10; ) Is further provided, and the fastening means 81 and 82 are fastened through the holes 41a and 42a. And the racket (41, 42), is fastened to the pressure and to the sensor 50, the preload plate 60, the bushing bracket to the inner tube 11, 41 and 42 inside direction (A).

Description

Excitement force measuring device of a body of car}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the excitation force of a vehicle body in a trailing arm bush while driving. In particular, the vehicle body excitation force is directly measured by mounting a three-axis washer-type force sensor between the bushing inner tube and the bracket. It is about the measuring device.

In general, accelerometers have been used to determine the body excitation force in the trailing arm bush during operation. This method measures the relative acceleration of the body and the trailing arm, integrates it twice, indirectly estimates the deformation of the bush, and calculates the body vibration by multiplying the complex bushing's complex stiffness coefficient.

However, in this conventional method, an unwanted error occurs as the acceleration signal is integrated twice, which causes an error in the low frequency section related to the riding comfort to be very large, and thus the exact excitation force cannot be known.

In addition, the complex stiffness coefficient of the rubber bush has a problem that it is difficult to accurately measure the excitation force because the change is large depending on the operating conditions such as static load, dynamic displacement, temperature and the like.

Accordingly, the present invention has been invented to solve the above problems, by mounting a three-axis washer-type force sensor on the vehicle transmission path of the excitation force generated from the engine while driving, to accurately measure the excitation power by measuring the excitation force directly An object of the present invention is to provide a vehicle body excitation measuring device that can be used.

1 is a schematic cross-sectional view showing a state in which a three-axis wire-type force sensor is mounted, according to the present invention;

2 is a graph showing the excitation force measured by the excitation force measuring apparatus according to the present invention.

<Description of the Reference Code>

10-rubber bush, 11-bush inner tube,

12-bush exterior, 40-bracket,

50-sensor, 60-preload plate,

70 spacer, 81, 82 fastening means.

In order to achieve the above object, the present invention provides a vehicle in which a driving force is transmitted from a road surface or an engine to a vehicle body via a trailing arm, a rubber bush, a rubber bush inner tube, a bracket, and a vertical direction between the bush inner tube and the bracket. And a three-axis washer-type force sensor designed to measure force in the horizontal and longitudinal directions.

(Example)

The transmission path to the vehicle body of the excitation force generated from the engine while traveling is transmitted from the road surface or the engine to the vehicle body via the trailing arm 30, the rubber bush 10, the rubber bush inner tube 11, and the bracket 40. That is, the excitation force generated on the road surface or the engine is finally transmitted to the vehicle body through the bushing inner tube 11 and the bracket.

Therefore, as shown in FIG. 1, the force in the vertical direction Fz and the horizontal direction Fx (inner side of the drawing) and the longitudinal direction Fy is measured between the bush inner tube 11 and the bracket 40. The 3-axis washer-type force sensor 50 to be mounted.

That is, the bracket 40 which consists of two parts of the accommodating bracket 41 and the fastening bracket 42, the fastening holes 41a and 41b is formed, and is attached to a vehicle body, and this bracket 41 and 42 is carried out. Two three-axis washer-type sensors 50, which are stored at the innermost side of the head), a preload plate 60 for preloading the sensor 50 toward the brackets 41 and 42 (the opposite direction of the A direction), and the preload plate A bushing inner tube 11 supporting the brackets 41 and 42, a bush 10 mounted in a shape surrounding the bush inner tube 11, and a bush outer appearance 12 surrounding the bush 10.

Further, a bolt 81 and a nut 82 are provided as fastening means fitted in the holes 41a and 41b to press the brackets 41 and 42 in the inward direction A.

Here, the sensor 50, the preload plate 60, and the bushing inner tube 11 are provided with fastening holes arranged on the same axis as the holes 41a and 42a, respectively, and the force sensor 50 is a When the fastening hole is large, it is mounted to the shaft B via the spacer 70 to secure the mounting on the shaft.

Accordingly, the sensor 50 into which the spacer 70 is fitted is placed in contact with the inner wall of the bracket 41 while matching the fastening hole formed at the center with the shaft B of the bolt, and sequentially the preload plate 60 The bush 10 and the bush inner and outer tubes 11 and 12 are placed, and in the state where the preload plate 60 and the sensor 50 in which the spacer 70 is fitted are placed, the bracket 42 is placed, and then the hole The fastening of the force sensor 50 is completed by fastening the bolts and the nuts 41a and 42a with the medium.

As the force sensor is mounted as described above, the force is applied by the bushing inner tube 11 and the preload plate 60 to oppose the force generated in the inner direction A of the bracket by the fastening means 81 and 82. Since the sensor 50 is supported by the force from the side toward the side of the brackets 41 and 42, the measurement of the excitation force (force in the Fx and Fz directions) is facilitated by using the static friction acting on the force sensor 50.

On the other hand, Figure 2 is a graph showing the excitation force measured by the excitation force measuring device according to the present invention, it shows that the force in the vertical (Fig. 2a) length (Fig. 2b) horizontal (Fig. 2c) direction reliably measured in the low frequency section Lose.

As described above, according to the present invention, by directly measuring the excitation force between the bushing inner tube and the bracket to which the excitation force is transmitted, the excitation force generated in the engine and the ground can be accurately measured without signal processing as in the prior art.

Claims (2)

In a vehicle in which the driving force is transmitted from the road surface or the engine to the vehicle body via the trailing arm, the rubber bush, the rubber bush inner tube, the bracket, Between the bush inner tube 11 and the brackets 41 and 42, a three-axis washer-type force sensor 50 is configured to measure the force in the vertical direction Fz, the horizontal direction Fx and the longitudinal direction Fy. The vehicle body excitation force measuring apparatus of the vehicle characterized in that the support by the force received toward the bracket by the bushing inner tube (11) and the force toward the bushing inner tube (11) by the bracket (41,42). The method of claim 1, wherein the bracket is composed of a receiving bracket 41 and a fastening bracket 42, each formed with fastening holes 41a, 42a, Two three-axis washer-type sensors 50 stored inside the brackets 41 and 42, a preload plate 60 for preloading the sensors 50 toward the brackets 41 and 42, and the preload plate A bush inner tube 11 supporting the (41, 42) side, a bush 10 mounted in a shape surrounding the bush inner tube 11, and a bush outer appearance 12 surrounding the bush 10 are further provided. The fastening means 81 and 82 are fastened to the holes 41a and 42a to fasten the brackets 41 and 42, the sensor 50, the preload plate 60, and the bushing inner tube 11 to the bracket 41. 42) The vehicle body excitation measuring device, characterized in that the fastening in the inward direction (A) to be fastened.