Lightweight steering engine shell structure capable of increasing structural strength

Abstract

The utility model relates to the technical field of steering systems, in particular to a lightweight steering engine shell structure capable of increasing structural strength. A lightweight steering gear shell structure capable of increasing structural strength is characterized in that a claw rib is arranged between one side of a driving gear pipe wall and a rack pipe wall, the claw rib is of a Y-shaped structure, a transverse rib at one end of the claw rib is connected with the rack pipe wall, the other end of the claw rib is forked to form an upper side wing plate and a lower side wing plate, and the upper side wing plate and the lower side wing plate are connected with the driving gear pipe wall. An upper side wing plate of the cleat rib is connected with the outer side of the pipe wall of the driving gear, and a lower side wing plate of the cleat rib is connected with the outer side surface of the bearing hole; a first reinforcing rib is arranged between the other side of the driving gear pipe wall and the rack pipe wall. Compared with the prior art, the horn rib structure is designed, so that the strength of the shell is obviously improved under the conditions that the thin wall thickness is kept and the weight of the shell is increased slightly; and meanwhile, the local thickness can be prevented from being too large, so that the casting defect caused by non-uniform cooling in the casting process can be better avoided.

Description

Technical Field

[0001] This utility model relates to the field of steering system technology, specifically a lightweight steering gear housing structure that can increase structural strength. Background Technology

[0002] With the popularization of the three-electric system of new energy vehicles and the increasing maturity of intelligent driving, new energy family sedans and SUVs are becoming more and more popular among consumers. However, new energy vehicles with long driving range mean heavier overall vehicle weight. This means that in daily travel and other complex working conditions, the steering gear housing of new energy vehicles has to withstand greater impact kinetic energy compared to fuel vehicles. Therefore, more attention should be paid to the safety of the steering gear housing under high torque and rapid steering conditions.

[0003] Therefore, the design of the steering gear housing needs to be lengthened and thickened to meet the strength requirements under various complex working conditions. However, an excessively long and thick housing would increase the product cost and affect the efficiency of the tram.

[0004] Therefore, in order to avoid severe yielding or cracking of the steering gear housing under harsh conditions such as large rack force or large torque, a steering gear housing structure that simultaneously meets the requirements of structural strength and lightweighting was designed. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this utility model provides a lightweight steering gear housing structure that can increase structural strength. It is designed with a rib-like structure, which significantly improves the housing strength while maintaining a thin wall thickness and a negligible increase in housing weight. Furthermore, more effective mass participates in the vibration during vibration, reducing the vibration frequency. At the same time, it can avoid excessive local thickness, thus better avoiding casting defects caused by uneven cooling during the casting process.

[0006] To achieve the above objectives, a lightweight steering gear housing structure with increased structural strength is designed, comprising a rack tube wall, a drive gear tube wall, a motor end, a servo end, a sensor end, and a bushing mounting hole. One end of the rack tube wall is connected to the motor end and the servo end, and the other end of the rack tube wall is connected to the drive gear tube wall. The upper and lower ends of the drive gear tube wall are respectively connected to the sensor end and the bearing hole. The bushing mounting hole is connected to the rack tube wall located on one side of the bearing hole. The key feature is that a Y-shaped reinforcing rib is provided between one side of the drive gear tube wall and the rack tube wall. The Y-shaped rib has a horizontal rib at one end connected to the rack tube wall, and the other end forks to form an upper wing plate and a lower wing plate. The upper wing plate of the Y-shaped rib is connected to the outer side of the drive gear tube wall, and the lower wing plate is connected to the outer side of the bearing hole. A reinforcing rib is provided between the other side of the drive gear tube wall and the rack tube wall.

[0007] The reinforcing rib is parallel to the axis of the rack.

[0008] The lower end of the sensor is connected to the rack tube wall by reinforcing ribs two and three on the left and right sides, respectively.

[0009] One end of the ram's horn tendon is parallel to the axis of the rack.

[0010] The upper and lower wing plates at the other end of the ram's horn tendon are connected to the transverse tendon at one end of the ram's horn tendon by an S-shaped transition.

[0011] The upper and lower wing plates at the other end of the ram's horn tendon are respectively higher than the drive gear tube wall and the bearing hole.

[0012] Compared with the prior art, this utility model provides a lightweight steering gear housing structure that can increase structural strength. The design of the spur structure significantly improves the housing strength while maintaining a thin wall thickness and a negligible increase in housing weight. Furthermore, more effective mass participates in the vibration during vibration, reducing the vibration frequency. At the same time, it can avoid excessive local thickness, thus better avoiding casting defects caused by uneven cooling during the casting process.

[0013] Compared with the traditional method of increasing the wall thickness of a circular tube, this invention can better meet the strength and life requirements under impact and fatigue conditions. Attached Figure Description

[0014] Figure 1 This is the main view of the structure of this utility model.

[0015] Figure 2 This is a top view of the structure of this utility model.

[0016] Figure 3 This is a partially enlarged schematic diagram of the structure of this utility model. Detailed Implementation

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

[0018] like Figures 1 to 3As shown, a lightweight steering gear housing structure that can increase structural strength includes a rack tube wall, a drive gear tube wall, a motor end, a servo end, a sensor end, and a bushing mounting hole. One end of the rack tube wall 7 is connected to the motor end 3 and the servo end 4, and the other end of the rack tube wall 7 is connected to the drive gear tube wall 8. The upper and lower ends of the drive gear tube wall 8 are respectively connected to the sensor end 2 and the bearing hole 11. The bushing mounting hole 1 is connected to the rack tube wall 7 on one side of the bearing hole 11. A reinforcing rib 6 is provided between one side of the drive gear tube wall 8 and the rack tube wall 7. The reinforcing rib 6 has a Y-shaped structure. One end of the reinforcing rib 6 is connected to the rack tube wall 7, and the other end of the reinforcing rib 6 is forked to form an upper wing plate and a lower wing plate. The upper wing plate of the reinforcing rib 6 is connected to the outer side of the tube wall of the drive gear tube wall 8, and the lower wing plate of the reinforcing rib 6 is connected to the outer side of the bearing hole 11. A reinforcing rib 5 is provided between the other side of the drive gear tube wall 8 and the rack tube wall 7.

[0019] The reinforcing rib 5 is parallel to the axis of the rack.

[0020] The lower end of sensor 2 is connected to the rack tube wall 7 by reinforcing ribs 9 and 10 on the left and right sides respectively.

[0021] One end of the transverse rib of the sheep horn 6 is parallel to the axis of the rack.

[0022] The upper and lower wing plates at the other end of the ram's horn 6 are connected to the transverse rib at one end of the ram's horn 6 in an S-shaped transition.

[0023] The upper and lower wing plates at the other end of the ram's horn 6 are higher than the drive gear tube wall 8 and the bearing hole 11, respectively.

[0024] like Figure 3 As shown, the upper wing plate of the ram's rib 6 rests on the top of the drive gear tube wall 8, the lower wing plate of the ram's rib 6 is outside the bearing hole 11, the transverse rib at the tail of the ram's rib 6 is parallel to the reinforcing rib 5, and the reinforcing rib 5 is parallel to the direction of the rack axis.

[0025] Unlike the typical Y-shaped reinforcing ribs, which have a straight or simple bend transition, the upper and lower side flanges of the ram's rib 6 are connected by an S-shaped transition. The upper and lower side flanges on the right side of the ram's rib 6 are higher than the drive gear tube wall 8 and the bearing hole 11, respectively. Then they bend to the left and descend, joining together in the middle to form a rib, and then bend again to transition to the rack tube wall 7.

[0026] The reinforcing ribs 6 are mainly arranged between the drive gear tube wall 8 and the rack tube wall 7. Under various working conditions, the rack tube wall 7 will undergo very large bending deformation, resulting in particularly large stress concentration at the intersection of the drive gear tube wall 8 and the rack tube wall 7. In this invention, the calculated elastic strength at the intersection of the rack tube wall 7 and the drive gear tube wall 8 exceeds the evaluation standard by up to 2.2 times, and the area of ​​stress concentration is large, distributed along the rack axis and the circumference of the tube wall. Therefore, compared with the traditional structure, the rib 6 structure can withstand 2.5 times more load, effectively improving the strength of the shell structure.

[0027] This invention takes a steering gear housing as an example, and conducts strength impact tests using both a traditional structure and a novel structure. CAE strength calculations show that the novel structure reduces stress values ​​at stress-prone locations on the rack tube wall by approximately 65%, and stress values ​​at stress-prone locations on the drive gear tube wall by approximately 72%. Simultaneously, it avoids noise problems caused by large deformation of the drive gear tube wall, damage to the inner and outer bearing rings caused by large deformation of the bearing bore, and thread breakage at the locking nut hole caused by large deformation of the locking nut hole. Compared to similar conventionally reinforced housings, the weight increase is only about 5g, achieving the high strength and lightweight requirements of the housing.

Claims

1. A lightweight steering gear housing structure that can increase structural strength, comprising a rack tube wall, a drive gear tube wall, a motor end, a servo end, a sensor end, and a bushing mounting hole, wherein one end of the rack tube wall (7) is connected to the motor end (3) and the servo end (4), and the other end of the rack tube wall (7) is connected to the drive gear tube wall (8), the upper and lower ends of the drive gear tube wall (8) are respectively connected to the sensor end (2) and the bearing hole (11), and the bushing mounting hole (1) is connected to the rack tube wall (7) located on one side of the bearing hole (11), characterized in that: A rib (6) is provided between one side of the drive gear tube wall (8) and the rack tube wall (7). The rib (6) has a Y-shaped structure. One end of the rib (6) is connected to the rack tube wall (7). The other end of the rib (6) is forked to form an upper wing plate and a lower wing plate. The upper wing plate of the rib (6) is connected to the outer side of the tube wall of the drive gear tube wall (8). The lower wing plate of the rib (6) is connected to the outer side of the bearing hole (11). A reinforcing rib (5) is provided between the other side of the drive gear tube wall (8) and the rack tube wall (7).

2. The lightweight steering gear housing structure with increased structural strength according to claim 1, characterized in that: The reinforcing rib (5) is parallel to the direction of the rack axis.

3. The lightweight steering gear housing structure with increased structural strength according to claim 1, characterized in that: The lower end of the sensor end (2) is connected to the rack tube wall (7) by reinforcing ribs 2 (9) and 3 (10) respectively.

4. A lightweight steering gear housing structure with increased structural strength according to claim 1, characterized in that: One end of the transverse rib of the ram's horn (6) is parallel to the direction of the rack axis.

5. A lightweight steering gear housing structure with increased structural strength according to claim 1, characterized in that: The upper and lower wing plates at the other end of the ram's horn (6) are connected to the transverse rib at one end of the ram's horn (6) in an S-shape transition.

6. A lightweight steering gear housing structure with increased structural strength according to claim 1, characterized in that: The upper and lower wing plates at the other end of the ram's horn (6) are higher than the drive gear tube wall (8) and the bearing hole (11), respectively.

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