阅读说明：本技术 转向系统的动力传动装置 (Power transmission device of steering system ) 是由 金宗汉 于 2019-09-03 设计创作，主要内容包括：一种转向系统的动力传动装置。第一连接器包括联接到第一轴的第一联接部分以及从第一联接部分轴向突出的第一支撑部分。第二连接器包括联接到与第一轴同轴设置的第二轴的第二联接部分以及从第二联接部分轴向突出以与第一支撑部分周向间隔开的第二支撑部分。阻尼器轴向联接在第一连接器和第二连接器之间,并且包括周向支撑在第一支撑部分和第二支撑部分之间的叶片。(A power transmission device of a steering system. The first connector includes a first coupling portion coupled to the first shaft and a first support portion axially protruding from the first coupling portion. The second connector includes a second coupling portion coupled to a second shaft disposed coaxially with the first shaft and a second support portion axially protruding from the second coupling portion to be circumferentially spaced apart from the first support portion. The damper is axially coupled between the first connector and the second connector and includes a blade circumferentially supported between a first support portion and a second support portion.)

1. A power transmission device of a steering system, the power transmission device comprising:

a first connector including a first coupling portion coupled to a first shaft and a first support portion axially protruding from the first coupling portion;

a second connector including a second coupling portion coupled to a second shaft disposed coaxially with the first shaft and a second support portion axially protruding from the second coupling portion to be circumferentially spaced apart from the first support portion; and

a damper axially coupled between the first connector and the second connector and including a blade circumferentially supported between the first support portion and the second support portion.

2. The power transmission device according to claim 1, wherein the first coupling portion has a first fitting recess into which the first shaft is fitted, the serration being axially provided on an inner peripheral surface of the first fitting recess, and the second coupling portion has a second fitting recess into which the second shaft is fitted, the serration being axially provided on an inner peripheral surface of the second fitting recess.

3. The power transmission device according to claim 1, wherein the damper includes:

a first outer support member including a first outer blade of the blades radially protruding from an outer circumferential surface of an annular first body thereof;

a second outer support member including a second outer blade radially protruding from an outer circumferential surface of an annular second body thereof among the blades; and

an inner support member axially coupled between the first and second outer support members and including an inner blade among the blades axially supported between the first and second outer blades.

4. The power transmission device of claim 3, wherein the inner support member comprises:

a cylindrical axial support member fitted into the first and second outer support members; and

a radial support member including an inner body connected to an outer circumferential surface of the axial support member and the inner blade disposed on the outer circumferential surface of the inner body.

5. The power transmission device according to claim 4, wherein the axial support member has a threaded portion provided on an outer peripheral surface thereof, the threaded portion including axially alternating ridges and grooves.

6. The power transmission device according to claim 4, wherein the axial support member is made of an elastic material, and an annular strength reinforcing member made of metal or plastic is provided inside the axial support member.

7. The power transmission device according to claim 6, wherein the axial support member has a jig hole in one or both of one side surface and the other side surface thereof, the strength reinforcing member being fixedly held in the jig hole to be integral with the axial support member.

8. The power transmission device of claim 4, wherein the radial support member has a through-hole extending axially between an outer peripheral surface of the axial support member and the inner body.

9. The power transmission device according to claim 8, wherein the first outer support member has a first extension that axially protrudes from an inner peripheral surface of the first main body to extend through a first through hole among the through holes.

10. The power transmission device according to claim 9, wherein the second outer support member has a second extension that axially protrudes from an inner peripheral surface of the second main body to extend through a second through hole that is circumferentially adjacent to the first through hole through which the first extension extends, among the through holes.

11. The power transmission device according to claim 10, wherein the first and second extensions extend through the through-hole while circumferentially alternating with each other.

12. The power transmission device according to claim 11, wherein the first outer support member has a first connection recess provided in an inner peripheral surface thereof at a position corresponding to the second through hole such that the second extension is coupled to the first connection recess through the second through hole.

13. The power transmission device according to claim 12, wherein each of the second extensions has a fitting recess provided on an outer surface thereof, and each of the first coupling recesses has a fitting protrusion such that the fitting protrusions are engaged with the fitting recesses, respectively.

14. The power transmission device according to claim 13, wherein the second outer support member has a second connection recess provided in an inner peripheral surface thereof at a position corresponding to the first through hole such that the first extension is coupled to the second connection recess through the through hole.

15. The power transmission device according to claim 14, wherein each of the first extensions has a fitting recess provided on an outer surface thereof, and each of the second coupling recesses has a fitting protrusion such that the fitting protrusions are engaged with the fitting recesses, respectively.

16. The power transmission device according to claim 4, wherein one end portion and the other end portion of the axial support member axially protrude beyond the first outer support member and the second outer support member, respectively.

17. The power transmission device according to claim 16, wherein the one end portion of the axial support member is supported on an inner surface of the first coupling portion, and the other end portion of the axial support member is supported on an inner surface of the second coupling portion.

18. The power transmission device according to claim 4, wherein the first outer blade, the second outer blade, and the inner blade are provided to overlap in an axial direction so as to circumferentially alternate with the first support portion and the second support portion.

19. The power transmission device of claim 18, wherein a circumferential width of each of the inner lobes is greater than a circumferential width of each of the first and second outer lobes.

20. The power transmission device according to claim 19, wherein both side surfaces of the inner blade in the circumferential direction are supported and elastically pressed by both side surfaces of the first support portion and the second support portion.

Technical Field

Background

A steering system of a vehicle is a device that allows a driver to freely change the direction in which the vehicle travels by turning a steering wheel. Steering systems are used to change the center of rotation of the front wheels of a vehicle, thereby helping the driver to steer the vehicle in the direction he or she wishes to travel. The steering system may be implemented as an electric power assisted steering system that includes a power assist mechanism to reduce the amount of force that the driver must apply to change the orientation of the front wheels.

The electric power steering system is configured to detect rotation of a steering wheel and drive a motor provided on a rack or a steering shaft to assist rotation of front wheels, so that steering can be performed efficiently.

However, in these electric power steering systems of the related art, the power transmission device is configured such that the inner rotor and the outer rotor simply fit each other when engaged with each other, so that the inner portion of the inner rotor and the inner portion of the outer rotor directly contact each other. When the vehicle has been used for a certain period of time or is traveling on a certain road such as a gravel road, a large amount of shock may be reversely input along the steering shaft, causing wear in a play portion (play portion) of the inner and outer rotors due to contact and generating noise.

In addition, a process of engaging the inner and outer rotors with each other and a process of applying lubricating oil to a space between the inner and outer rotors may be required, thereby increasing steps required in the assembly process and manufacturing costs, which causes problems.

Disclosure of Invention

Aspects provide a power transmission apparatus of a steering system capable of transmitting torque from a first shaft to a second shaft without vibration or noise while reliably maintaining strength and absorbing noise due to heat or shock, as compared to the power transmission apparatus of the related art.

Objects of the present disclosure are not limited to the above description, and other objects not specifically disclosed herein will be clearly understood from the description provided below by those having ordinary skill in the art to which the present disclosure pertains.

According to an aspect, an embodiment provides a power transmission device of a steering system, the power transmission device including: a first connector including a first coupling portion coupled to the first shaft and a first support portion axially protruding from the first coupling portion; a second connector including a second coupling portion coupled to a second shaft disposed coaxially with the first shaft and a second support portion axially protruding from the second coupling portion to be circumferentially spaced apart from the first support portion; and a damper axially coupled between the first connector and the second connector and including a blade circumferentially supported between the first support portion and the second support portion.

According to the exemplary embodiments, the power transmission device of the steering system can transmit torque from the first shaft to the second shaft without vibration or noise and absorb noise due to heat or shock while reliably maintaining strength, as compared to the power transmission device of the related art.

Drawings

The above and other objects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic view showing a steering system according to an embodiment;

fig. 2 to 6 are perspective views showing components of a power transmission device of a steering system according to an embodiment;

fig. 7 is a front view showing a power transmission device of the steering system according to the embodiment; and

fig. 8 to 11 are cross-sectional views illustrating a power transmission device of a steering system according to an embodiment.

The embodiment relates to a power transmission device of a steering system. More particularly, embodiments relate to a power transmission apparatus of a steering system, which is capable of transmitting torque from a first shaft to a second shaft without vibration or noise and absorbing noise due to heat or shock while reliably maintaining strength, as compared to the power transmission apparatus of the related art.