Steering wheel positioner

Abstract

The utility model discloses steering wheel stop device, include: steering casing, pipe column for connecting steering wheel, locate in the steering casing, first limit wheel, coaxial fixed in the one end of pipe column away from steering wheel, second limit wheel, locate in the steering casing, wherein, the outer peripheral wall of first limit wheel is equipped with first gear tooth, the outer peripheral wall of second limit wheel is equipped with the second gear tooth and limit protruding piece along the circumferential arrangement, the second gear tooth is connected on both sides of limit protruding piece, first gear tooth and second gear tooth engage, and first gear tooth movable abuts on both sides of limit protruding piece. When rotating clockwise, steering wheel drives pipe column to rotate, when first gear tooth and second gear tooth engage and rotate to abut on one side of limit protruding piece, pipe column stops rotating, and steering wheel is limited, when rotating anticlockwise, first gear tooth and second gear tooth engage and rotate to abut on the other side of limit protruding piece, pipe column stops rotating, and prevent steering wheel from rotating excessively.

Description

Technical Field

[0001] This utility model relates to the field of steering gear technology, specifically to a steering wheel limiting device. Background Technology

[0002] In modern automotive steering systems, especially with the increasing prevalence of Electric Power Steering (EPS) and Steer-by-Way (SbW) technologies, road feel simulation functions are widely integrated to enhance driving feel and safety. This key technology aims to drive a road feel motor through sophisticated control algorithms, generating and transmitting torque feedback to the steering wheel in real time, simulating road conditions (such as bumps, lateral forces, and self-centering torque), and then to the driver. This feedback is crucial for the driver to perceive the vehicle's status, maintain stable vehicle control, and achieve a realistic driving immersion, making it a core component of human-machine interaction in Advanced Driver Assistance Systems (ADAS) and future autonomous driving systems.

[0003] The core hardware for achieving this function is typically integrated within the steering column assembly. This assembly not only contains the basic mechanical structure that transmits the driver's steering inputs but also integrates the critical worm gear mechanism and road feel motor. The worm gear mechanism's core function is to provide a basic and adjustable steering resistance torque, simulating the "feel" of traditional hydraulic steering; while the road feel motor, based on this, dynamically superimposes or finely adjusts the torque to accurately achieve the aforementioned complex road feel simulation.

[0004] However, the range of steering wheel operation must be strictly limited. If the driver excessively rotates the steering wheel beyond the designed safe travel (e.g., ±540°, i.e., 1.5 turns to the left and right, for a total of 3 turns), it will pose serious risks: on the one hand, it may damage the precision mechanical components inside the steering column (such as gears, worm gears, and sensors) or the motor; on the other hand, the more direct danger is that it will cause the steering wheels (tires) to rotate too much, which may lead to them scraping against the wheel arches or other parts of the vehicle body or even getting stuck. This could result in damage to the tires and the vehicle body, or even a sudden loss of steering control, causing a safety accident. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model proposes a steering wheel limiting device. Through a limiting mechanism in which the first gear meshes with and abuts against the limiting protrusion, the clockwise / counterclockwise rotation stroke of the steering wheel is precisely limited to prevent oversteering.

[0006] The technical solution adopted by this utility model is as follows: A steering wheel limiting device includes: a steering housing; a column for connecting the steering wheel, disposed within the steering housing; a first limiting wheel, coaxially fixed to the end of the column away from the steering wheel; and a second limiting wheel, disposed within the steering housing; wherein, the outer peripheral wall of the first limiting wheel is provided with a first tooth, and the outer peripheral wall of the second limiting wheel is provided with a second tooth arranged circumferentially and a limiting protrusion, the second tooth engaging with both sides of the limiting protrusion; the first tooth meshes with the second tooth, and the first tooth movably abuts against both sides of the limiting protrusion.

[0007] Optionally, the second limiting wheel is rotatably mounted on the steering housing via a rotating shaft. A first bearing is provided between the rotating shaft and the second limiting wheel. The inner ring of the first bearing is sleeved on the outer peripheral wall of the rotating shaft, and the outer ring of the first bearing abuts against the inner peripheral wall of the second limiting wheel.

[0008] Optionally, the transmission ratio between the first limiting wheel and the second limiting wheel is 2.5 to 4.

[0009] Optionally, the first limiting wheel includes a sun gear and planet gears. The sun gear is coaxially sleeved on the outer periphery of the tube column. The sun gear meshes with the planet gears. The outer periphery of the planet gears is provided with the first gear teeth. The second limiting wheel is provided with a first through hole for the sun gear to pass through. The inner peripheral wall of the second limiting wheel is provided with the second gear teeth and the limiting protrusion.

[0010] Optionally, the column is provided with a planetary carrier, one end of which is rotatably connected to the column, and the other end of which is fixedly connected to the planetary gears.

[0011] Optionally, the transmission ratio between the sun gear and the second limiting gear is 3 to 4.

[0012] Optionally, the second limit wheel is mounted to the steering housing by screws.

[0013] Optionally, one end of the planetary carrier is provided with a second through hole for the tube column to pass through, and the other end of the planetary carrier is provided with a connecting rod. The connecting rod is fixedly connected to the planetary gear. A second bearing is provided between the planetary carrier and the tube column. The inner ring of the second bearing abuts against the outer circumference of the tube column, and the outer ring of the second bearing abuts against the wall of the second through hole.

[0014] Optionally, it also includes a reduction assembly, which includes a worm gear and a worm, the worm gear being coaxially sleeved on the outer peripheral wall of the tube column, and the worm meshing with the worm gear.

[0015] Optionally, the steering housing is detachably connected to a cover, the cover having a groove on the side facing the column, and a third bearing being provided on the outer peripheral wall of the column or the outer peripheral wall of the planetary carrier, the outer ring of the third bearing abutting against the groove wall.

[0016] The beneficial effects of this utility model are: when rotating clockwise, the steering wheel drives the column to rotate. When the first gear tooth meshes with the second gear tooth and rotates to the side of the limiting protrusion, the column stops rotating and the steering wheel is limited. When rotating counterclockwise, the first gear tooth meshes with the second gear tooth and rotates to the other side of the limiting protrusion, and the column stops rotating, effectively preventing the steering wheel from rotating excessively. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the steering wheel limiting device proposed in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the worm gear and worm meshing in the steering wheel limiting device proposed in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the planetary gears and sun gear of the steering wheel limiting device proposed in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the cover of the steering wheel limiting device proposed in an embodiment of the present invention.

[0021] The labels in the attached figures are as follows: 1. Steering housing; 2. Tube column; 3. First limiting wheel; 31. First gear tooth; 32. Sun gear; 33. Planet gear; 34. Planet carrier; 341. Connecting rod; 4. Second limiting wheel; 41. Second gear tooth; 42. Limiting protrusion; 43. First through hole; 44. First bearing; 5. Shaft; 6. Worm gear; 7. Worm; 8. Cover; 81. Groove; 9. Third bearing. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4As shown, this embodiment discloses a steering wheel limiting device, including: a steering housing 1; a column 2 for connecting the steering wheel, disposed within the steering housing 1; a first limiting wheel 3, coaxially fixed to the end of the column 2 away from the steering wheel; and a second limiting wheel 4 disposed within the steering housing 1. The outer peripheral wall of the first limiting wheel 3 is provided with a first tooth 31, and the outer peripheral wall of the second limiting wheel 4 is provided with a second tooth 41 arranged circumferentially and a limiting protrusion 42. The second tooth 41 engages with both sides of the limiting protrusion 42. The first tooth 31 meshes with the second tooth 41, and the first tooth 31 movably abuts against both sides of the limiting protrusion 42. When rotated clockwise, the steering wheel drives the column 2 to rotate. When the first gear 31 and the second gear 41 mesh and rotate to the side of the limiting protrusion 42, the column 2 stops rotating and the steering wheel is limited. When rotated counterclockwise, the first gear 31 and the second gear 41 mesh and rotate to the other side of the limiting protrusion 42, and the column 2 stops rotating, effectively preventing the steering wheel from rotating excessively.

[0024] In this embodiment, as Figure 1 and 2 As shown, the second limiting wheel 4 is rotatably mounted on the steering housing 1 via a rotating shaft 5. A first bearing 44 is provided between the rotating shaft 5 and the second limiting wheel 4. The inner ring of the first bearing 44 is sleeved on the outer peripheral wall of the rotating shaft 5, and the outer ring of the first bearing 44 abuts against the inner peripheral wall of the second limiting wheel 4. The rotating shaft 5 is fixedly mounted to the limiting housing. The rotating shaft 5 can be a screw. The first bearing 44 causes the second limiting wheel 4 to be rotatably mounted inside the limiting housing.

[0025] like Figure 1 As shown, the transmission ratio between the first limiting wheel 3 and the second limiting wheel 4 is 2.5~4. In this embodiment, the steering wheel travel is set to ±540°, that is, 1.5 turns in both the forward and reverse directions, for a total travel of three turns. When the first tooth 31 abuts against the limiting protrusion 42, the first limiting wheel 3 needs to rotate three turns (corresponding to the total steering wheel travel). The designed transmission ratio is 3.23, and the module is 2.4mm. The first tooth 31 of the first limiting wheel 3 has 13 teeth, and the second tooth 41 of the second limiting wheel 4 has 39 teeth. The length of the limiting protrusion 42 is equivalent to 3 second teeth 41.

[0026] like Figure 3 As shown, the first limiting wheel 3 includes a sun gear 32 and planet gears 33. The sun gear 32 is coaxially sleeved on the outer periphery of the tube column 2, and the sun gear 32 meshes with the planet gears 33. The outer periphery of the planet gears 33 is provided with the first gear teeth 31. The second limiting wheel 4 is provided with a first through hole 43 for the sun gear 32 to pass through. The inner peripheral wall of the second limiting wheel 4 is provided with the second gear teeth 41 and the limiting protrusions 42. The sun gear 32 meshes with the second limiting wheel 4 through the planet gears 33. The planet gear 33 structure reduces the radial space occupied and improves the compactness of the device.

[0027] like Figure 3 As shown, the tube column 2 is equipped with a planet carrier 34. One end of the planet carrier 34 is rotatably connected to the tube column 2, and the other end of the planet carrier 34 is fixedly connected to the planet gears 33. The planet carrier 34 realizes the linkage between the revolution and rotation of the planet gears 33. In other examples, the sun gear 32 can be fixedly connected to the planet carrier 34, and the planet gears 33 are rotatably connected to the planet carrier 34.

[0028] like Figure 3 As shown, the transmission ratio between the sun gear 32 and the second limiting gear 4 is 3~4. When the first gear tooth 31 abuts against the limiting protrusion 42, the sun gear 32 needs to rotate three revolutions (corresponding to the total travel of the steering wheel). The designed transmission ratio is 3.2, with a module of 1.8mm. The sun gear 32 has 20 teeth, the first gear tooth 31 of the planetary gear 33 has 12 teeth, and the second gear tooth 41 of the second limiting gear 4 has 40 teeth. The length of the limiting protrusion 42 is equivalent to four second gear teeth 41. The transmission ratio of this planetary gear train is calculated as follows: Where Zr is the number of teeth on the second limiting wheel 4 (second wheel tooth 41 + limiting protrusion 42), and Zs is the number of teeth on the sun wheel 32. The worm gear 6 and worm 7 reduce speed and increase output torque, improve steering feel and reduce limiting impact.

[0029] like Figure 3 As shown, the second limiting wheel 4 is mounted to the steering housing 1 by screws. This facilitates installation and disassembly.

[0030] like Figure 3 As shown, one end of the planetary carrier 34 is provided with a second through hole for the tube column 2 to pass through, and the other end of the planetary carrier 34 is provided with a connecting rod 341. The connecting rod 341 is fixedly connected to the planetary gear 33. A second bearing is provided between the planetary carrier 34 and the tube column 2. The inner ring of the second bearing abuts against the outer circumference of the tube column 2, and the outer ring of the second bearing abuts against the wall of the second through hole.

[0031] like Figure 2 As shown, it also includes a speed reduction assembly, which includes a worm gear 6 and a worm 7. The worm gear 6 is coaxially sleeved on the outer peripheral wall of the tube column 2, and the worm 7 meshes with the worm gear 6.

[0032] like Figure 3 and 4 As shown, the steering housing is detachably connected to a cover 8. The cover 8 has a groove 81 on the side facing the column 2. A third bearing 9 is provided on the outer peripheral wall of the column 2 or the outer peripheral wall of the planetary carrier 34. The outer ring of the third bearing 9 abuts against the groove wall of the groove 81. The steering housing can be connected to the cover 8 by screws.

[0033] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A steering wheel limiting device, characterized in that, include: Steering housing; A column, used to connect the steering wheel, is located inside the steering housing; The first limiting wheel is coaxially fixed to the end of the column away from the steering wheel; The second limiting wheel is located inside the steering housing; The first limiting wheel has a first tooth on its outer peripheral wall, and the second limiting wheel has a second tooth and a limiting protrusion arranged circumferentially on its outer peripheral wall. The second tooth is connected to both sides of the limiting protrusion. The first gear tooth meshes with the second gear tooth, and the first gear tooth moves against both sides of the limiting protrusion.

2. The steering wheel limiting device according to claim 1, characterized in that, The second limiting wheel is rotatably mounted on the steering housing via a rotating shaft. A first bearing is provided between the rotating shaft and the second limiting wheel. The inner ring of the first bearing is sleeved on the outer peripheral wall of the rotating shaft, and the outer ring of the first bearing abuts against the inner peripheral wall of the second limiting wheel.

3. The steering wheel limiting device according to claim 2, characterized in that, The transmission ratio between the first limiting wheel and the second limiting wheel is 2.5 to 4.

4. The steering wheel limiting device according to claim 2, characterized in that, The first limiting wheel includes a sun gear and planet gears. The sun gear is coaxially sleeved on the outer periphery of the tube column. The sun gear meshes with the planet gears. The outer periphery of the planet gears is provided with the first gear teeth. The second limiting wheel is provided with a first through hole for the sun gear to pass through. The inner peripheral wall of the second limiting wheel is provided with the second gear teeth and the limiting protrusion.

5. The steering wheel limiting device according to claim 4, characterized in that, The column is equipped with a planetary carrier, one end of which is rotatably connected to the column, and the other end of which is fixedly connected to the planetary gears.

6. The steering wheel limiting device according to claim 4, characterized in that, The transmission ratio between the sun gear and the second limit gear is 3 to 4.

7. The steering wheel limiting device according to claim 4, characterized in that, The second limit wheel is mounted to the steering housing by screws.

8. The steering wheel limiting device according to claim 5, characterized in that, One end of the planetary carrier is provided with a second through hole for the tube column to pass through, and the other end of the planetary carrier is provided with a connecting rod. The connecting rod is fixedly connected to the planetary gear. A second bearing is provided between the planetary carrier and the tube column. The inner ring of the second bearing abuts against the outer circumference of the tube column, and the outer ring of the second bearing abuts against the wall of the second through hole.

9. The steering wheel limiting device according to claim 1, characterized in that, It also includes a speed reduction assembly, which includes a worm gear and a worm. The worm gear is coaxially sleeved on the outer peripheral wall of the tube column, and the worm meshes with the worm gear.

10. The steering wheel limiting device according to claim 5, characterized in that, The steering housing is detachably connected to a cover, and the side of the cover facing the column has a groove. The outer peripheral wall of the column or the outer peripheral wall of the planetary carrier is provided with a third bearing, and the outer ring of the third bearing abuts against the groove wall.

Images