Knuckle and design method thereof

Abstract

The application discloses a knuckle, which comprises a ring topology structure, a disc body and a front axle, the ring topology structure and the front axle are connected to the two sides of the disc body respectively, two pin holes are arranged on the ring topology structure and are located on the same axis, and the curved surface surrounded by the outer end of the ring topology structure is a saddle-shaped hyperboloid, and the two pin holes are arranged at the convex position of the saddle-shaped hyperboloid. The application further discloses a design method of the knuckle. The knuckle obtained by the application has a reasonable structure, and can avoid the problems of crack expansion and overall failure of components caused by the fracture of the root of the vertical rib on the knuckle in the prior art.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mine dump trucks, and particularly relates to a knuckle and a design method thereof. BACKGROUND

[0002] The mine dump truck belongs to off-highway dump trucks, and is mainly used for transporting ores and mine materials in large open-pit mines. At present, the specifications of the mine dump trucks are getting larger and larger, and the carrying capacity is gradually increasing, and the mine dump trucks have developed to giant mine trucks with a carrying capacity of 400 tons. The mine dump trucks have higher and higher requirements for the carrying capacity of the vehicle chassis walking mechanism. The knuckle (or front axle) as an important component of the vehicle chassis walking mechanism is also paid more and more attention to the carrying performance.

[0003] At present, due to poor mine roads and severe road vibration, the knuckle back vertical rib root is prone to fracture before the service life, resulting in knuckle damage. The knuckle damage will cause safety and huge vehicle repair problems. SUMMARY

[0004] The purpose of the present application is to provide a knuckle and a design method thereof, which has a reasonable structure and can avoid the problem of crack expansion and component overall failure caused by the fracture of the vertical rib root of the knuckle in the prior art.

[0005] To achieve the above purpose, the technical solution used by the present application is:

[0006] The knuckle comprises: a ring topology structure, a disc body and a front axle, the ring topology structure and the front axle are connected to the two sides of the disc body respectively, two pin holes are arranged on the ring topology structure, and the two pin holes are located on the same axis; a curved surface surrounded by the outer side end of the ring topology structure is a saddle-shaped hyperboloid, and the two pin holes are arranged at the convex positions of the saddle-shaped hyperboloid.

[0007] Further, a shaft sleeve is arranged in the pin hole.

[0008] Further, a pin shaft is installed in the pin hole, the pin shaft is connected with a connecting plate, and the connecting plate is connected with a steering mechanism.

[0009] Further, the disc body is connected with a flange plate.

[0010] The design method of the knuckle comprises:

[0011] The vertical rib and the connecting lug are cancelled, and a ring topology structure is additionally arranged on the back of the disc body to eliminate the stress concentration at the vertical rib of the back of the knuckle; the curved surface surrounded by the outer side end of the ring topology structure is designed to be a saddle-shaped hyperboloid.

[0012] The thickness and height of the ring topology structure are determined through finite element iterative calculation, and the two convex positions on the ring topology structure are respectively provided with pin holes.

[0013] Preferably, according to topology, finite element theory, structural mechanics, fatigue life theory, the annular topology structure on the back surface of the front axle is designed within the service life.

[0014] Preferably, according to topology and structural mechanics theory, the whole is strengthened to avoid the load drop after the stud is deleted, and the curved surface surrounded by the end of the annular topology structure is designed as a saddle-shaped hyperboloid.

[0015] The technical effects of the present application include:

[0016] In the knuckle of the present application, the disc body is connected with the annular topology structure as a whole, the connecting lug and stud in the prior art are cancelled, the overall strength and rigidity are improved, and the overall life of the component is improved by several times.

[0017] The knuckle provided by the present application has a reasonable structure, and can avoid the problem of crack expansion and overall failure of the component caused by the root fracture of the stud on the knuckle in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure diagram of the knuckle in the present application;

[0019] Figure 2 is a rear end structure diagram of the knuckle in the present application;

[0020] Figure 3 is a schematic view of the knuckle in the present application installed on the front axle;

[0021] Figure 4 is a schematic view of the finite element analysis result of the knuckle in the present application. DETAILED DESCRIPTION

[0022] The following description fully illustrates the specific embodiments of the present application to enable a person skilled in the art to practice and reproduce.

[0023] As shown in Figure 1 , it is a structure diagram of the knuckle in the present application. As shown in Figure 2 , it is a rear end structure diagram of the knuckle in the present application.

[0024] The knuckle comprises an annular topology structure 1, a disc body 2 and a front axle 3, the annular topology structure 1 and the front axle 3 are connected on both sides of the disc body 2 respectively, the annular topology structure 1 is provided with pin holes 11, and the two pin holes 11 are located on the same axis.

[0025] One end of the annular topology structure 1 is connected to the disc body 2, and the curved surface surrounded by the other end is a saddle-shaped hyperboloid, and the two pin holes 11 are arranged at the convex position of the saddle-shaped hyperboloid. A shaft sleeve can be arranged in the pin hole 11 to reduce the friction force.

[0026] AsFigure 3 Fig. 1 is a schematic diagram of the present application, showing the knuckle installed on the front axle.

[0027] The pin hole 11 of the ring topology 1 is installed with a pin shaft 4, which is used to connect the ring topology 1 on both sides of the front axle 5. The pin shaft 4 is connected with a connecting plate 51, which is connected with the steering mechanism. The disc body 2 is used to connect the flange plate.

[0028] Fig. 2 is a schematic diagram of the finite element analysis result of the knuckle in the present application. Figure 4

[0029] The design method of the knuckle is as follows:

[0030] Step 1: cancel the vertical ribs and connecting ears, and add a ring topology 1 on the back of the disc body 2; design the curved surface surrounded by the outer end of the ring topology 1 as a saddle-shaped hyperboloid;

[0031] The knuckle is redesigned in the present application. According to the theories of topology, finite element, structural mechanics and fatigue life, the required support structure (ring topology 1) on the back of the front axle 3 under the service life is designed. Without affecting the assembly of other components and without interfering with the movement of other components such as the front axle, the newly designed knuckle can avoid the problem of cracking within the service life.

[0032] In the prior art, the vertical ribs on the back of the knuckle deform when the knuckle is under pressure. The position and structure of the vertical ribs cannot support such deformation, which may cause cracking. According to the theories of topology and structural mechanics, increasing the stiffness of the overall support and the flexibility of the local part can effectively inhibit local cracking of the component without reducing the overall strength of the component.

[0033] Due to stress concentration at the vertical ribs on the back of the knuckle, the vertical ribs on the back of the knuckle are prone to cracking. According to the theory of structural mechanics, the vertical ribs are removed and the ring topology 1 replaces the vertical ribs and connecting ears, which can reduce the stiffness of the high stress area and avoid stress concentration. In the specific design process, the existing vertical ribs are removed by using the theories of topology and structural mechanics, the local stiffness is reduced, and a ring topology 1 is added to the back of the disc body 2.

[0034] Further, according to the theories of topology and structural mechanics, the overall structure is strengthened to avoid the decrease in load bearing after the removal of the vertical ribs. The curved surface surrounded by the end of the ring topology 1 is designed as a saddle-shaped hyperboloid, which further improves the stiffness compared to the original horizontal and makes the component have stronger load bearing capacity, while avoiding the problem of local stress concentration.

[0035] ​The load under working condition is applied to the component, the stress of the structure is analyzed by using the finite element theory, the stress exceeding standard area of the root of the original vertical rib disappears, so the local rigidity is reduced (the flexibility is increased) to avoid the stress concentration in the area, and the overall rigidity is improved due to the increase of the annular topology structure 1 without reducing the load bearing capacity of the component. According to the finite element calculation, the limit load bearing of the single component can reach 150 tons, the overall stress value of the component meets the design requirement, the maximum stress value disappears from the root of the original vertical rib and appears in a region at the top of the annular topology structure 1 and a region at the front end, but is still far less than the allowable stress value of the material considering the safety factor. According to the fatigue theory, the service life is increased by 2 times.

[0036] Step 2: The thickness and height of the annular topology structure 1 are determined by the finite element iterative calculation, and the pin hole 11 is arranged on the annular topology structure 1.

[0037] The annular topology structure 1 meets the requirements of processing and manufacturing, cost, installation and bearing, and realizes the great performance improvement under the condition of little increase of cost and weight.

[0038] The terms used in the present application are illustrative and exemplary, but not limited. Since the present application can be embodied in various forms without departing from the spirit or essence of the technical scheme, it should be understood that the above examples are not limited to any of the above details, but should be widely interpreted in the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A steering knuckle, characterized in that: include: The annular topological structure, the disc body, and the front axle are respectively connected to both sides of the disc body. Two pin holes are provided on the annular topological structure. The two pin holes are located on the same axis, and shaft sleeves are provided in the pin holes. The curved surface surrounded by the outer end of the annular topological structure is a saddle-shaped hyperboloid. The two pin holes are arranged at the raised position of the saddle-shaped hyperboloid. The pin shaft is connected to the connecting plate, and the connecting plate is connected to the steering mechanism.

2. The steering knuckle according to claim 1, wherein: The disc body is connected to the flange plate.

3. A method for designing a steering knuckle according to any one of claims 1 or 2, characterized in that: include: Eliminate the vertical ribs and connecting ears, and add a ring topology structure on the back of the disc body to eliminate stress concentration at the vertical ribs on the back of the steering knuckle; Applying topology and structural mechanics theory, the whole structure is strengthened to avoid the load-bearing drop after removing the vertical reinforcement. The curved surface formed by the outer end of the ring topology structure is designed to be a saddle-shaped hyperboloid. The thickness and height of the annular topological structure are determined by finite element iterative calculation, and pin holes are respectively set at two protruding positions on the annular topological structure.

4. The method for designing a steering knuckle according to claim 3, wherein: Based on topology, finite element theory, structural mechanics, and fatigue life theory, the annular topological structure of the back of the front axle is designed during its service life.

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