Reducing mechanism and steering column hand feeling simulator

Abstract

The utility model discloses a speed reducing mechanism and a steering column hand feeling simulator. The speed reducing mechanism comprises an inner gear ring, an outer gear ring and a steering column, the sun gear is movably mounted in the center of the inner gear ring and corresponds to a speed reduction input end; the planet gears are arranged in the inner gear ring, outer teeth of the planet gears are meshed with inner teeth of the inner gear ring and outer teeth of the sun gear respectively, and the planet gears are used for corresponding to the speed reduction output end; wherein at least one planet gear comprises a first planet gear and a second planet gear which are the same in gear parameter, and the first planet gear and the second planet gear are connected through a torsion spring. By means of the structure, gaps generated in the planetary gear meshing transmission process when a driver rotates the steering wheel can be eliminated, steering abnormal sounds are avoided, and the steering quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of automobiles, and particularly to a speed reduction mechanism and a steering column feel simulator having the speed reduction mechanism. Background Art

[0002] Automobile power steering refers to a technology that helps the driver more easily control the vehicle by increasing the steering assistance during the driving process of the automobile. This technology can significantly reduce the steering force of the driver under low-speed driving or low-grip conditions, and improve the driving stability and comfort.

[0003] At present, due to structural limitations, the planetary speed reduction mechanism of the speed reducer of the steering column feel simulator on the market mostly has a straight-tooth structure, and the planetary gears are in general straight-tooth form. Due to manufacturing factors such as machining and assembly errors, the gear backlash of the planetary speed reduction mechanism often fails to reach the ideal design parameters, which greatly affects the repeat positioning accuracy of the overall mechanism of the speed reducer, resulting in abnormal noises or uneven steering feel when the driver turns the steering wheel during driving. Summary of the Utility Model

[0004] The present application designs a speed reduction mechanism with a planetary gear backlash elimination structure. Without reducing the functions and performance of the feel simulator, the use of the planetary gear backlash elimination structure can effectively eliminate the meshing clearance during the movement of the speed reduction mechanism and reduce the motor noise during the operation of the motor.

[0005] To achieve the above object and other related objects, the present application provides a speed reduction mechanism with a planetary gear backlash elimination structure, including an internal gear ring; a sun gear, the sun gear is movably installed at the center of the internal gear ring, and the sun gear is used to correspond to the speed reduction input end; planetary gears, a plurality of planetary gears are arranged in the internal gear ring, and the external teeth of the planetary gears are respectively meshed with the internal teeth of the internal gear ring and the external teeth of the sun gear, and the planetary gears are used to correspond to the speed reduction output end; wherein, at least one planetary gear includes a first planetary gear and a second planetary gear with the same gear parameters, and the first planetary gear and the second planetary gear are connected by a torsion spring.

[0006] Further, in the embodiment of the present application, the first planetary gear and the second planetary gear are arranged in abutting contact.

[0007] Further, in the embodiment of the present application, the internal teeth of the internal gear ring, the external teeth of the sun gear, and the external teeth of the planetary gears are all in a helical tooth structure.

[0008] Further, in the embodiment of the present application, an assembly groove for assembling the torsion spring is provided on the opposite end surfaces of the first planetary gear and / or the second planetary gear.

[0009] Further, in the embodiments of the present application, the center of the assembly groove coincides with the centers of the first planetary gear and the second planetary gear.

[0010] Further, in the embodiments of the present application, the notch of the assembly groove is provided with a chamfer structure.

[0011] Further, in the embodiments of the present application, the torsion spring is arranged as a ring with an opening, and the two ends of the torsion spring at the opening are arranged in a staggered manner.

[0012] Further, in the embodiments of the present application, insertion rods are integrally bent at the two ends of the torsion spring respectively, and the two insertion rods extend in opposite directions; the insertion rods are used to connect the first planetary gear and the second planetary gear.

[0013] Further, in the embodiments of the present application, a plurality of torsion springs are arranged between the first planetary gear and the second planetary gear.

[0014] Further, in the embodiments of the present application, a steering column feel simulator is further provided, and the steering column feel simulator has the aforementioned speed reduction mechanism.

[0015] The speed reduction mechanism with a planetary gear clearance elimination mechanism and the steer-by-wire column feel simulator with the speed reduction mechanism of the present application have at least the following advantages:

[0016] (1) The central axis of the speed reduction input end coincides with or is parallel to the central axis of the steering shaft, so that the steer-by-wire column feel simulator with the novel speed reduction mechanism with a planetary gear clearance elimination structure can be directly driven by the motor output shaft, and the structure is compact;

[0017] (2) The gears of the speed reduction mechanism are helical gears, and by designing the gear parameters, different motor speed reduction ratio requirements can be met;

[0018] (3) At least one planetary gear is composed of two gears with the same parameters, and the two gears are connected by a backlash-eliminating torsion spring. At the same time, a chamfer structure for facilitating assembly is added at the gear end, which can reduce the working noise during motor operation, make the spatial layout of the speed reduction mechanism compact, and is conducive to layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the steer-by-wire column feel simulator of the present application.

[0021] Figure 2 This is an exploded view of the steer-by-wire steering column feel simulator of the present application.

[0022] Figure 3 This is a schematic structural diagram of a speed reduction mechanism with a planetary gear backlash elimination structure of the present application.

[0023] Figure 4 This is an exploded view of the present application when the planetary gear consists of two planetary gears.

[0024] Figure 5 This is a schematic structural diagram of the present application when the rotating shaft is connected to the planetary gear.

[0025] Reference numeral description:

[0026] Speed reduction mechanism 1; internal gear ring 2; sun gear 3; planetary gear 4; speed reduction input end 5; speed reduction output end 6; assist motor 7; rotating shaft 8; control device 9; upper steering column assembly 10; mounting seat 11; motor 12; first gear 31; central shaft 32; first planetary gear 41; second planetary gear 42; pin shaft 43; torsion spring 44; insertion rod 441; assembly groove 45; rotating disk 81; input shaft 82; rotating shaft rod 83; upper steering column housing 101; first housing 102; second housing 103. Specific embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will elaborate on each embodiment of the present application with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present application, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation to the specific implementation manner of the present application. Each embodiment can be combined with each other and cross-referenced on the premise of not being contradictory.

[0028] This embodiment provides a speed reduction mechanism with a planetary gear backlash elimination structure. By setting at least one planetary gear to consist of 2 gears with the same parameters and connecting the two gears with a torsion spring, it can achieve reducing the speed of the motor and increasing the torque while eliminating the backlash during the meshing transmission of the planetary gears when the driver reciprocally rotates the steering wheel, avoiding abnormal noises or uneven steering feel when the driver turns the steering wheel during driving, and improving the steering quality.

[0029] The following will elaborate in detail on a speed reduction mechanism with a planetary gear backlash elimination structure provided in this embodiment with reference to the accompanying drawings.

[0030] AsFigures 2 - 4 As shown in the figure, it includes: an internal gear ring 2, the internal gear ring 2 is of an annular structure, and internal teeth are provided on the inner ring of the annular structure; a sun gear 3, the sun gear 3 is movably installed at the center of the internal gear ring 2, and the sun gear 3 is used to correspond to the deceleration input end 5; planet gears 4, several planet gears 4 are arranged inside the internal gear ring 2, and the external teeth of the planet gears 4 are respectively meshed with the internal teeth of the internal gear ring 2 and the external teeth of the sun gear 3, and the planet gears 4 are used to correspond to the deceleration output end 6; wherein, at least one planet gear 4 includes a first planet gear 41 and a second planet gear 42 with the same gear parameters, and the first planet gear 41 and the second planet gear 42 are connected by a torsion spring 44, as Figure 3 shown in the figure, a reduction mechanism 1 in which a planet gear 4 is composed of two planet gears with the same parameters connected by a torsion spring is shown.

[0031] As Figure 1 and Figure 2 shown in the figure, the present application provides a steering column feel simulator, including: a reduction mechanism 1, a boosting motor 7, an upper column assembly 10 and a control device 9, the upper column assembly 10 is installed on one side of the boosting motor 7; the reduction mechanism 1 is installed inside the upper column assembly 10, the deceleration output end 6 of the reduction mechanism 1 is connected to the power input end of the upper column assembly 10, the deceleration input end 5 of the reduction mechanism 1 is connected to the power output end of the boosting motor 7, and the central axis of the deceleration input end 5 coincides with the central axis of the deceleration output end 6; the control device 9 is electrically connected to the boosting motor 7 to control the steering and rotation speed of the power output end of the boosting motor 7 according to the steering signal.

[0032] In this embodiment, when driving the reduction mechanism 1 and the upper column assembly 10 to rotate through the boosting motor 7, the power is transmitted from the boosting motor 7 to the deceleration input end 5 of the reduction mechanism 1, and then the input power of the deceleration input end 5 is decelerated by the reduction mechanism 1 and output through the deceleration output end 6. When outputting through the deceleration output end 6, by setting the axial direction of the deceleration input end 5 to coincide with the axial direction of the deceleration output end 6, so as to realize that when the boosting motor 7 is decelerated by the reduction mechanism 1, without reducing the functions and performance of the feel simulator and ensuring that the reduction mechanism 1 can reduce the speed and increase the torque of the boosting motor 7, by setting at least one of the planet gears 4 to be composed of 2 gears with the same parameters and the two gears are connected by a torsion spring 44, it can realize reducing the speed of the motor and increasing the torque, while eliminating the gap in the meshing transmission process of the planet gears when the driver reciprocally rotates the steering wheel, avoiding abnormal noise or uneven steering feel when the driver turns the steering wheel during driving, and improving the steering quality.

[0033] Further, in the embodiment of the present application, the number of teeth of the external teeth of the planet gear 4 is greater than the number of teeth of the external teeth of the sun gear 3, and the number of teeth of the internal teeth of the internal gear ring 2 is greater than the number of teeth of the external teeth of the planet gear 4.

[0034] Specifically, by designing the number of external teeth of the planetary gear 4 to be greater than the number of external teeth of the sun gear 3 meshing therewith, and then matching the corresponding motor power according to different gear reduction ratios, when the power of the motor 12 is transmitted to the sun gear 3, variable assistance can be provided through software tuning, achieving the effect of speed reduction and torque increase, and further realizing the effective steering of the driver.

[0035] Further, in the embodiment of the present application, the first planetary gear 41 and the second planetary gear 42 are arranged in abutting contact.

[0036] Specifically, the first planetary gear 41 and the second planetary gear 42 cooperate to mesh with the internal gear ring 2 and the sun gear 3. In this embodiment, by arranging the first planetary gear 41 and the second planetary gear 42 in a fitting manner, the torsion spring 44 is hidden between the two planetary gears.

[0037] Further, in the embodiment of the present application, the internal teeth of the internal gear ring 2, the external teeth of the sun gear 3, and the external teeth of the planetary gear 4 are all helical tooth structures.

[0038] Specifically, the internal gear ring 2, the planetary gear 4, and the sun gear 3 are meshed with each other through helical teeth to achieve the transmission of torque, so as to reduce the working noise during the operation of the motor 12, make the spatial layout of the entire speed reduction mechanism 1 compact, and facilitate the layout of other modules.

[0039] Further, in the embodiment of the present application, an assembly groove 45 for assembling the torsion spring 44 is provided on the opposite end faces of the first planetary gear 41 and / or the second planetary gear 42.

[0040] Specifically, referring to Figure 4 As can be seen, an assembly groove 45 for arranging the torsion spring 44 is formed in one or both of the first planetary gear 41 and the second planetary gear 42. And a hole structure for fixing the torsion spring 44 is provided in the first planetary gear 41 and the second planetary gear 42.

[0041] Further, in the embodiment of the present application, referring to Figure 4 As can be seen, the notch of the assembly groove 45 is provided with a chamfer structure.

[0042] Further, in the embodiment of the present application, the torsion spring 44 is arranged as a ring with an opening, and the two end portions of the torsion spring 44 are arranged in a staggered manner at the opening.

[0043] Further, in the embodiment of the present application, insertion rods 441 are integrally bent at the two end portions of the torsion spring respectively, and the two insertion rods 441 extend in opposite directions; the insertion rods 441 are used to connect the first planetary gear 41 and the second planetary gear 42.

[0044] Further, in the embodiments of the present application, a plurality of torsion springs 44 are provided between the first planetary gear 41 and the second planetary gear 42 for fixed connection.

[0045] Specifically, a plurality of torsion springs 44 can be provided on the first planetary gear 41 and the second planetary gear 42 to better increase the elastic force between the two, greatly reducing the gear clearance.

[0046] Further, in the embodiments of the present application, the sun gear 3 includes: a first gear 31; and a central shaft 32, one end of the central shaft 32 is mounted on the first gear 31, and the other end of the central shaft 32 is connected to the power output end of the booster motor 7.

[0047] Specifically, in combination with Figure 1 and Figure 2 it can be known that the booster motor 7 includes: a mounting seat 11; and a motor 12, the motor 12 is mounted on the mounting seat 11, and the end of the motor 12 is correspondingly mounted on one end of the upper pipe column assembly 10. In the embodiments of the present application, the central shaft 32 on the sun gear 3 is connected to the output shaft of the motor 12, and the end of the central shaft 32 for connecting to the output shaft of the motor 12 is the reduction input end 5 of the reduction mechanism 1, so as to drive the sun gear 3 to rotate through the power of the booster motor 7.

[0048] In an embodiment of the present application, when the booster motor 7 and the upper pipe column assembly 10 are installed, by mounting the motor 12 on the mounting seat 11, and at the same time mounting the upper pipe column assembly 10 on the upper surface of the motor 12, the reduction mechanism 1 is installed between the upper pipe column assembly 10 and the booster motor 7.

[0049] Further, in the embodiments of the present application, the planetary gear 4 further includes: a pin shaft 43, and the pin shaft 43 is movably installed at the centers of the first planetary gear 41 and the second planetary gear 42.

[0050] Specifically, in the embodiments of the present application, the planetary gear 4 meshes with the first gear 31 of the sun gear 3, and at the same time, the planetary gear 4 also meshes with the internal teeth of the internal gear ring 2. Then when the first gear 31 rotates, it is transmitted to the planetary gear 4 to rotate self while revolving around the axis of the first gear 31. At the same time, when the planetary gear 4 revolves, the reduction output power corresponding to its shaft pin 43 is transmitted to the upper pipe column assembly 10 through the rotation center as the reduction output end 6.

[0051] Further, in the embodiments of the present application, the pin shaft 43 is connected to the rotating disk 81, thereby driving the input shaft 82 provided on the other side of the rotating disk 81 to rotate.

[0052] When the speed reduction mechanism 1 transmits power via the assist motor 7, power is input through the speed reduction input end 5 to cause the sun gear 3 to rotate. When the sun gear 3 rotates, it drives the planet gears 4 meshing therewith to rotate. At the same time, the planet gears 4 also mesh with the internal teeth on the internal gear ring 2, driving the planet gears 4 to rotate around the center of the sun gear 3. Furthermore, the power of the planet gears 4 rotating around the sun gear 3 is used as the power of the speed reduction output end 6 to further drive the rotating disk 81 to rotate.

[0053] As Figure 2 and 5 shown, in an embodiment of the present application, during the installation of the rotating shaft 8, by connecting the rotating disk 81 with each group of pin shafts 43, it is ensured that the central axis of the first gear 31 coincides or is parallel to the central axis of the input shaft 82, so as to realize the connection of the power of the planet gears 4 with the rotating disk 81 via the pin shafts 43 to achieve the power output to the input shaft 82. Although in Figure 5 the planet gears 4 connected to the rotating disk 81 are all composed of a single planet gear, the connection relationship between the planet gear and the rotating disk 81 is the same as the structure in which at least one of the planet gears 4 in the present application is composed of two planet gears and then connected to the rotating disk 81. In other words, replacing at least one of the planet gears 4 in Figure 5 with two combined planet gears gives the connection relationship between the planet gear and the rotating disk 81 in the present application.

[0054] Furthermore, during the installation of the rotating disk 81, it is located between the inner side wall of the second housing 103 and the speed reduction mechanism 1.

[0055] A steering column feel simulator includes the above-mentioned speed reduction mechanism having a planetary gear backlash elimination structure.

[0056] As Figures 1 - 2 shown, the control device 9 is a feel simulation controller. The steering signal includes the road feel signal recognized by the steering gear and the driver hand force change induction signal corresponding to the steering wheel. Please refer to Figure 1 the embodiment given. The motor 12 and the upper column housing 101 are both installed on the mounting seat 11. Moreover, the speed reduction mechanism 1 is installed in the upper column housing 101 on one side of the motor 12, and then by installing the upper column housing 101 at the end of the motor 12, the integrated installation of the speed reduction mechanism 1 between the upper column housing 101 and the motor 12 is achieved. At the same time, when outputting power, the power of the motor 12 is directly output to the speed reduction input end 5, and after being decelerated and torque-increased by the speed reduction mechanism 1, it is further output to the speed reduction output end 6, and then the power output to the upper column assembly 10 is further realized via the speed reduction output end 6.

[0057] As Figure 2As shown, in an embodiment of the present application, during the process of the upper column assembly 10 receiving the power from the deceleration output end 6 and transmitting it to the steering wheel, power is output from the deceleration output end 6 (i.e., the revolution of the pin shaft 43 around the center of the first gear 31) to the rotating shaft 8 installed in the upper column housing 101, and then the power is output to the input shaft 82 through the rotating shaft 8, and further output to the steering wheel of the vehicle through the input shaft 82. The upper column housing 101 includes: a first housing 102, and the first housing 102 is correspondingly inserted with the rotating shaft 8; and a second housing 103, the second housing 103 is installed at one end of the first housing 102, and the internal gear ring 2 is installed inside the second housing 103. In an embodiment of the present application, when installing the rotating shaft 8 and the deceleration mechanism 1 on the upper column housing 101, the first housing 102 is used to realize the limit installation of the rotating shaft 8, and the second housing 103 is used to realize the installation of the internal gear ring 2, so as to realize that the end of the second housing 103 can be docked with the end of the motor 12 for assembly and installation.

[0058] See Figure 2 In the embodiment shown, during the installation of the simulator, the motor 12 is installed by the control device 9 in sequence, the deceleration mechanism 1 is installed at one end of the upper column housing 101, and the upper column housing 101 is used to install the end of the motor 12. Thus, after the power of the motor 12 is transmitted to the deceleration input end 5, it is decelerated by the deceleration mechanism 1 and then output to the rotating shaft 8 through the deceleration output end 6. The power is output to the input shaft 82 through the rotating shaft 8, and then the power is used to assist in outputting to the steering wheel through the input shaft 82.

[0059] It should be understood that the above specific embodiments of the present application are only used for exemplary illustration or explanation of the principle of the present application, and do not constitute a limitation to the present application. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present application shall be included within the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all changes and modifications that fall within the scope and boundary of the appended claims, or equivalent forms of such scope and boundary.

Claims

1. A speed reduction mechanism, characterized in that: include: Internal gear ring (2); A sun gear (3), the sun gear (3) being movably mounted at the center of the inner gear ring (2), the sun gear (3) being used to correspond to the speed reduction input end (5); Planetary gears (4), a plurality of the planetary gears (4) are arranged in the inner gear ring (2), the outer teeth of the planetary gears (4) are respectively meshed with the inner teeth of the inner gear ring (2) and the outer teeth of the sun gear (3), and the planetary gears (4) are used to correspond to the speed reduction output end (6); At least one of the planetary gears (4) comprises a first planetary gear (41) and a second planetary gear (42) having the same gear parameters, and the first planetary gear (41) and the second planetary gear (42) are connected via a torsion spring (44).

2. The speed reduction mechanism according to claim 1, characterized in that: The first planetary gear (41) and the second planetary gear (42) are arranged in close contact with each other.

3. The speed reduction mechanism according to claim 1, characterized in that: The inner teeth of the inner gear ring (2), the outer teeth of the sun gear (3), and the outer teeth of the planetary gear (4) are all helical tooth structures.

4. The speed reduction mechanism according to claim 1, characterized in that: Mounting grooves (45) for mounting torsion springs (44) are provided on opposite end surfaces of the first planetary gear (41) and / or the second planetary gear (42).

5. The speed reduction mechanism according to claim 4, characterized in that: The center of the assembly groove (45) coincides with the center of the first planetary gear (41) and the second planetary gear (42).

6. The speed reduction mechanism according to claim 4, characterized in that: The notch of the assembly groove (45) is arranged as a chamfered structure.

7. The speed reduction mechanism according to claim 4, characterized in that: The torsion spring (44) is arranged in a ring shape with an opening, and the torsion spring (44) is arranged at two staggered ends of the opening.

8. The speed reduction mechanism according to claim 7, characterized in that: The two ends of the torsion spring (44) are respectively integrally bent with plug rods (441), and the two plug rods (441) are extended in opposite directions; the plug rods (441) are used to connect the first planetary gear (41) and the second planetary gear (42).

9. The speed reduction mechanism according to any one of claims 1 to 8, characterized in that: A plurality of torsion springs (44) are arranged between the first planetary gear (41) and the second planetary gear (42).

10. A steering column feel simulator, characterized in that: It comprises the speed reduction mechanism (1) according to any one of claims 1 to 9.

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