KR970006350B1 - Steering knuckle - Google Patents

Abstract

Among the A part(0.06kg), B part(0.25kg) and C part(0.24kg), A, C parts are eliminated having B part is changed with its size. The tie rod(4) joining part is 0.04kg removed, the control arm(5) joining part is changed approximately 0.02kg with the size. From among the brake caliper(2) joining part, D part(0.08kg) and E part(0.06kg) are removed. And the wheel spindle fixing part(3) is changed 0.21kg, while the antilock brake system sensor installation part(6) is changed 0.02kg.

Description

Lightweight steering knuckle

1 is a perspective view of the present invention.

2 is a perspective view of a conventional knuckle.

* Explanation of symbols for main parts of the drawings

1: Strut fastening part 2: Brake caliper connection part

3: wheel spindle connection part 4: tie rod connection part

5 Control arm connection 6 Anti-lock braking system mounting part

The present invention relates to the weight reduction of the steering knuckle. More specifically, the present invention relates to a knuckle that reinforces rigidity by reducing the weight by selecting and modifying a modified portion of the steering knuckle, which is one of the chassis parts, through stress analysis.

Conventional knuckles connect struts, tie rods, control arms, brake calipers, wheel spindles, etc. in a suspension device of a vehicle and each movement directly affects the movement of the wheel of the vehicle.

Therefore, it can be said that it has a large characteristic of the functional parts, and if the knuckle is damaged, it directly affects the movement of the vehicle, which may damage the passengers, so it must also have the characteristics of the safety components.

Due to these characteristics, knuckles are often overdesigned.

Such problems of overdesign have a bad effect on the material cost and the ride side due to the weight of the knuckle.

In order to solve the above problems, the present invention investigates the distribution of stress through the stress analysis of the conventional knuckle, and evenly distributes the distribution of non-uniform stress generated in the knuckle to have a uniform stress distribution, and reduce the unnecessary weight of the knuckle. The purpose is to make.

In order to achieve the above object, in the present invention, the knuckle is characterized by examining the stress of each part of the conventional knuckle, and changing the shape so as to evenly distribute the range of uneven stress generated in the knuckle based on the result. It is.

A more detailed embodiment of the present invention is as follows.

(1) purpose

The present invention was carried out as part of the weight reduction work to reduce the cost and improve the ride characteristics with respect to the front (FRT) knuckle, and the current goal is to reduce the weight of the front knuckle from 4.1Kg to 3.0Kg to be.

(2) area setting

1) In the present invention for the weight reduction of the knuckles to achieve the object through a partial shape change.

2) Selection of the part to be reduced was decided through the analysis result of the conventional knuckle.

3) The stress concentration phenomenon occurring in the knuckle reduction process was suggested through the recommendation, not the direct modification to the model.

(3) load condition

The load conditions used in the analysis were used in the limit load analysis and were considered for four cases as shown in Table 1 below.

The load data calculated with the above conditions were used as the input load for the FE analysis.

(4) boundary conditions

The boundary conditions were classified into two types, which were used as follows because the load conditions could be divided into driving conditions and breaking conditions.

1) driving status

Only the knuckle wheel spindle mounting position was restrained by using the restraint.

2) Breaking

Lateral rotation was allowed at the knuckle wheel spindle mounting position (1) and fixed at the brake caliper (2) mounting position. The other conditions were the same as in the driving state.

(5) material properties

The material used for the front (FRT) knuckle is FCD450 and has the mechanical properties as shown in Table 2 below.

(6) Conventional knuckle analysis result

2 is a solid model of a conventional knuckle. At this time, the weight is 4.3kg and the actual measured weight is about 0.2Kg difference. The actual weight is slightly lighter because the support around the hole at the strut fastening position 1 'has been cut after casting.

The results analyzed for each load case show that most of them show relatively high stress at the connection with the strut. Maximum stresses per rod case are shown in Table 3 below.

Except for the connection with the strut, other parts show only a small amount of stress.

Therefore, these parts were selected as the target to be reduced, and the connection part with strut was also reduced by partially changing the shape.

FIG. 1 is a schematic diagram of a reduced knuckle of FIG. 2, which is a conventional knuckle, in which major modification dimensions are indicated.

The parts and details of the weight loss using the analysis results of the conventional knuckles are as follows.

1) Strut part (1):

0.06Kg (Part A) + 0.25Kg (Part B) + 0.24Kg (Part C) = 0.57Kg

… … A, C part removal

… … Part B: Dimension Change

2) Tie-rod (4) connection part:

0.04 Kg... … remove

3) Control Arm (5) Connection Area:

0.02 Kg... … Change dimensions

4) Brake caliper (2) connection part:

0.08Kg (D part) + 0.06Kg (E part) = 0.14Kg

… … Remove D and E parts

5) Wheel spindle mounting area (3):

0.21 Kg... … Change dimensions

6) Anti-lock braking system sensor mounting area (6):

0.02 Kg... … Change dimensions

(7) Analysis result of knuckle of the present invention

Figure 1 shows the analysis results of the modified knuckles.

These stress distributions tend to be wider than those of the conventional knuckle analysis, and the maximum stress values appear to be somewhat increased.

The maximum stress values shown in the analysis results of the knuckles of the present invention are shown in Table 4 below.

In the above results, the stress in the port hole breaking (PHB) state is caused by the sudden change in curvature between the strut connection part 1 and the brake caliper connection part 2.

Therefore, in this part, a connection to a smooth curvature using ribs is desired.

The final shape of the knuckles with ribs of gentle curvature is lower than the maximum stress value calculated above, which is considered to be a safe result for each load case.

(8) Conclusion

1) It is considered that the stress generated during the pot hole braking can generate the fail through the analysis of the conventional knuckle and the present invention knuckle. This is the strut connection part and the brake caliper. (Brake Caliper) This can be solved by using gentle curvature ribs between the joints.

2) The weight of 3.3 Kg can be reached by the method presented in this report of conventional front (FRT) knuckles.

3) Anti-lock braking system The sensor mounting position should be changed to a small volume through design change. This only has the effect of increasing the weight of the knuckle and does not affect the surrounding stress.

The effect of the invention is to investigate the distribution of stress through the knuckle stress analysis and to evenly distribute the non-uniform stress distribution in the knuckle, to deform the shape of the knuckle to have a uniform stress distribution and to eliminate unnecessary weight. This reduces the cost of materials and has a positive impact on the ride side.

Claims (1)

Remove the A and C parts from the A part (0.06Kg), B part (0.25Kg) and C part (0.24Kg) of the strut part 1, change the B part dimension, and connect the tie rod (4) to 0.04 Remove the Kg, change the control arm (5) connection to 0.02 Kg, remove the brake caliper (2), remove the D part (0.08 Kg) and E part (0.06 Kg), and install the wheel spindle mounting area (3). ) Is a 0.21Kg dimension change, and an anti-lock braking system sensor mounting portion (6) 0.02Kg dimension change, lightweight steering knuckle.