Steering gear shell structure capable of simultaneously meeting requirements for structural strength and light weight

Abstract

The utility model relates to the technical field of automobile steering systems, in particular to a steering engine shell structure which simultaneously meets the requirements for structural strength and light weight and comprises a long shell, a triangular connecting rib and a triangular rib. Two triangular connecting ribs and two triangular ribs which are arranged in the axial direction of the long shell are installed between the long shell and the motor end, the two triangular connecting ribs are located above and below the long shell respectively, the two triangular ribs are located on the front sides of the two triangular connecting ribs respectively, the two triangular ribs are parallel to each other, and the two triangular ribs are perpendicular to the installation face of the motor end. Compared with the prior art, the triangular connecting rib and the triangular rib are arranged at the joint of the long shell and the motor end, so that the effective bearing area is ensured, the thickness of a pipe wall is reduced, the requirements of structural strength and light weight are met, and the shell is prevented from being severely yielded or cracked under severe working conditions such as large rack force or large torque.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering systems, in particular to a steering machine housing structure which meets the requirements of structural strength and lightness. Background Art

[0002] With the improvement of the public consumption level, considering the comfort and practicality of steering operation during vehicle travel, high-end models equipped with ball screws and belt-driven steering servo end nut assemblies are gradually favored by consumers.

[0003] In order to meet the long stroke and high load requirements of the steering gear of high-end models, the steering gear housing is lengthened and thickened to achieve the strength under various complex working conditions.

[0004] However, a shell that is too long will increase the lever arm, thereby increasing the bending moment and torque, and the risk of shell cracking will increase accordingly; a shell that is too thick will increase the cost of the product, increase the fuel consumption of fuel vehicles, and affect the efficiency of electric vehicles.

[0005] Therefore, it is necessary to design a steering gear housing structure that meets both structural strength and lightweight requirements to avoid severe yielding or cracking of the housing under harsh working conditions such as large rack force or large torque. Summary of the Invention

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a steering gear housing structure that meets the requirements of structural strength and lightweight, so as to avoid serious yielding or cracking of the housing under harsh working conditions such as large rack force or large torque.

[0007] In order to achieve the above-mentioned purpose, the utility model is a steering gear housing structure that meets the requirements of structural strength and lightweight at the same time, including a long shell, triangular connecting ribs, and triangular ribs. The two ends of the long shell are respectively the motor end and the sensor unit end. Two triangular connecting ribs and two triangular ribs arranged along the axial direction of the long shell are installed between the long shell and the motor end. The two triangular connecting ribs are respectively located above and below the long shell. The two triangular ribs are respectively located on the front sides of the two triangular connecting ribs. The two triangular ribs are parallel to each other, and the two triangular ribs are perpendicular to the mounting surface of the motor end. The triangular ribs have a right-angle support rib one and a right-angle support rib two. The right-angle support rib one is connected to the outer surface of the long shell, and the right-angle support rib two is connected to the mounting surface of the motor end.

[0008] The triangular connecting rib comprises a first connecting rib and a second connecting rib. The first connecting rib is connected to the outer surface of the long shell, and the second connecting rib is covered at the connection between the long shell and the motor end.

[0009] The wall thickness of the long shell near the motor end is uniform and the diameter of the tube is consistent.

[0010] The sensor unit end is provided with a bushing mounting hole.

[0011] The bushing mounting holes are located above and below the end of the sensor unit.

[0012] The end of the motor end is equipped with a steering servo end nut assembly.

[0013] Compared with the prior art, the utility model provides triangular connecting ribs and triangular ribs at the connection between the long shell and the motor end, which reduces the wall thickness of the tube while ensuring the effective bearing area, meets the requirements of structural strength and lightweight, and avoids serious yielding or cracking of the shell under harsh working conditions such as large rack force or large torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 It is a structural diagram of the triangular rib of the utility model.

[0016] Figure 3 This is a schematic structural diagram of the triangular connecting rib of the utility model. DETAILED DESCRIPTION

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] See also Figure 1 、 Figure 2 The utility model is a steering gear housing structure that meets the requirements of structural strength and lightweight at the same time, including a long housing, triangular connecting ribs, and triangular ribs. The two ends of the long housing 7 are the motor end 3 and the sensor unit end 2 respectively. The sensor unit end 2 is provided with a bushing mounting hole 1. The bushing mounting hole 1 is located above and below the sensor unit end 2. Two triangular connecting ribs 6 and two triangular ribs 5 arranged along the axial direction of the long housing 7 are installed between the long housing 7 and the motor end 3. The two triangular connecting ribs 6 are respectively located above and below the long housing 7. The two triangular ribs 5 are respectively located in front of the two triangular connecting ribs 6. The two triangular ribs 5 are parallel to each other, and the two triangular ribs 5 are perpendicular to the mounting surface 31 of the motor end 3. The end of the motor end 3 is installed with a steering servo end nut assembly 4.

[0019] The triangular ribs 5 include a first right-angle support rib 51 and a second right-angle support rib 52. The first right-angle support rib 51 is connected to the outer surface of the elongated housing 7, while the second right-angle support rib 52 is connected to the mounting surface 31 of the motor end 3. The two triangular ribs 5 effectively prevent the housing from cracking at the steering servo end nut assembly 4 due to large radial forces and torques on the rack.

[0020] At the same time, the wall thickness and diameter of the long housing 7 near the motor end 3 are uniform. The uniform section has roughly equal bending and torsional cross-sectional moduli, resulting in more even stress distribution. This effectively avoids stress concentration in the axial direction of the long housing 7 due to the large difference in bending and torsional cross-sectional moduli, and prevents casting defects caused by uneven cooling during the casting process. The uniform diameter avoids sudden changes in the inner and outer diameters of the wall, resulting in more uniform stress distribution. This allows for a thinner outer wall of the long housing 7, reducing product weight and achieving lightweighting.

[0021] See also Figure 3 The triangular connecting rib 6 has a connecting rib 1 61 and a connecting rib 2 62 . The connecting rib 1 61 is connected to the outer surface of the long shell 7 , and the connecting rib 2 62 is covered at the connection between the long shell 7 and the motor end 3 .

[0022] Strength impact tests were conducted using both the traditional structure and the present invention. CAE strength calculations showed that the stress value at the first risk location of the shell, i.e., at the connecting rib 2 62, was 458 MPa for the traditional structure, while it was 188 MPa for the present invention, a 59% reduction. At the second risk location of the shell, i.e., the stress concentration location at the end of motor end 3, the stress values were 393 MPa and 512 MPa for the traditional structure, respectively, while they were 211 MPa and 259 MPa for the present invention, respectively, a 46% and 49% reduction. At the same time, compared with the traditional structure, within the same distance, the shell of the present invention can reduce weight by 338 g, achieving the required lightweight shell.

[0023] The utility model can more evenly bear axial and radial forces on the shell tube wall, can better meet the strength requirements and life requirements of impact working conditions and fatigue working conditions, and can also meet the clearance requirements with environmental parts.

[0024] The utility model arranges triangular connecting ribs and triangular ribs at the connection between the long shell and the motor end, which reduces the wall thickness of the tube while ensuring the effective bearing area, meets the requirements of structural strength and lightweight, and avoids serious yielding or cracking of the shell under harsh working conditions such as large rack force or large torque.

Claims

1. A steering gear housing structure that satisfies both structural strength and lightweight requirements, comprising a long housing, triangular connecting ribs, and triangular ribs, wherein the two ends of the long housing (7) are respectively a motor end (3) and a sensor unit end (2), and is characterized in that: Two triangular connecting ribs (6) and two triangular ribs (5) arranged along the axial direction of the long housing (7) are installed between the long housing (7) and the motor end (3). The two triangular connecting ribs (6) are respectively located above and below the long housing (7). The two triangular ribs (5) are respectively located in front of the two triangular connecting ribs (6). The two triangular ribs (5) are parallel to each other and perpendicular to the mounting surface (31) of the motor end (3). The triangular rib (5) comprises a right-angle support rib (51) and a right-angle support rib (52). The right-angle support rib (51) is connected to the outer surface of the long shell (7), and the right-angle support rib (52) is connected to the mounting surface (31) of the motor end (3).

2. The steering gear housing structure that satisfies both structural strength and lightweight requirements according to claim 1, characterized in that: The triangular connecting rib (6) comprises a first connecting rib (61) and a second connecting rib (62), wherein the first connecting rib (61) is connected to the outer surface of the long shell (7), and the second connecting rib (62) is wrapped around the connection between the long shell (7) and the motor end (3).

3. The steering gear housing structure that satisfies both structural strength and lightweight requirements according to claim 1, characterized in that: The wall thickness of the long shell (7) close to the motor end (3) is uniform and the diameter is consistent.

4. The steering gear housing structure that satisfies both structural strength and lightweight requirements according to claim 1, characterized in that: The sensor unit end (2) is provided with a bushing mounting hole (1).

5. The steering gear housing structure that satisfies both structural strength and lightweight requirements according to claim 4, characterized in that: The bushing mounting holes (1) are located above and below the sensor unit end (2).

6. The steering gear housing structure that satisfies both structural strength and lightweight requirements according to claim 1, characterized in that: The end of the motor end (3) is mounted with a steering servo end nut assembly (4).

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