KR101770899B1 - Damping coupler and reducer having the same - Google Patents

Damping coupler and reducer having the same Download PDF

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Publication number
KR101770899B1
KR101770899B1 KR1020150186799A KR20150186799A KR101770899B1 KR 101770899 B1 KR101770899 B1 KR 101770899B1 KR 1020150186799 A KR1020150186799 A KR 1020150186799A KR 20150186799 A KR20150186799 A KR 20150186799A KR 101770899 B1 KR101770899 B1 KR 101770899B1
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KR
South Korea
Prior art keywords
damping
connector
coupled
protrusion
gear
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KR1020150186799A
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Korean (ko)
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KR20170076495A (en
Inventor
신경섭
안상희
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주식회사 만도
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Priority to KR1020150186799A priority Critical patent/KR101770899B1/en
Publication of KR20170076495A publication Critical patent/KR20170076495A/en
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Publication of KR101770899B1 publication Critical patent/KR101770899B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
    • B62D5/046—Controlling the motor
    • B62D5/0472—Controlling the motor for damping vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0421—Electric motor acting on or near steering gear
    • B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)
  • Retarders (AREA)

Abstract

A damping coupler is provided. The damping coupler has a first connector coupled to the inside of the hollow shaft and a second connector coupled to the inside of the hollow shaft so that one side of the damping coupler is coupled to the hollow shaft inner peripheral surface of the motor and the other side is coupled to the gear member, A second connector coupled to one side of the gear member, and a damping member having a ring-shaped cross section, wherein one side of the first connector is coupled to the outer circumferential surface and the other side of the second connector is coupled to the inner circumferential surface to be elastically pressed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper coupler,

The present invention relates to a damping coupler and a speed reducer having the damping coupler.

A steering apparatus of a vehicle is a device that allows a driver to freely change the traveling direction of a car by turning a steering wheel and arbitrarily changing the turning center of the front wheel of the car to assist the driver in moving the vehicle in a desired direction Device.

A power steering system is used as an auxiliary power mechanism in order to relieve the driver's power in such a steering apparatus. The power steering system mainly employs the power of the engine to operate the hydraulic pump, And a power assisted steering system using an electric motor.

The electronic power assist steering apparatus has a structure for sensing the rotation of the steering wheel and being installed on the rack or the steering shaft so that the steering apparatus can be smoothly operated by operating a motor that helps the turning motion.

In this case, it is difficult to secure a space for implementing the coupler structure when transmitting the output of the motor to the planetary reduction gear input, because the electromagnetic power steering apparatus using the hollow motor and the planetary speed reducer coaxial with the pinion. For this reason, a small space is secured between the sun gear and the hollow shaft of the motor using a serration structure, and a damping member is used.

However, in this case, when the load becomes large, a phenomenon occurs that the damping member rides over the tooth surface between the sun gear or the motor shaft. To prevent this, the rigidity of the damping member is increased. When the rigidity is increased, the damping effect is deteriorated.

Further, in order to realize a stopper structure by securing a space inside the shaft, it is difficult to add a separate shape to the inside of the hollow shaft, and when using a method of impact such as forging, the concentricity of the hollow shaft is distorted, .

An embodiment of the present invention is to provide a damping coupler that can prevent the performance from being degraded due to an alignment error when an output of a motor is transmitted to a reduction gear input in an electronic power steering that assists a steering force using a motor and a speed reducer .

An embodiment of the present invention is to provide a damping coupler that improves the steering feeling by increasing the rigidity and can prevent performance deterioration due to the assembly tolerance between the motor shaft and the sun gear.

According to an aspect of the present invention, in order to transmit the rotational force of the motor to the gear member, one side is coupled to the inner circumferential surface of the hollow shaft of the motor and the other side is coupled to the gear member, A first connector coupled to the interior of the shaft; A second connector in which a coupling member having a ring-shaped cross section formed at one end side in the extending direction of the gear member is coupled to the inside and a second connector to which the other side of the first connector is coupled to the inner circumferential surface, And a damping member having a ring-shaped cross-section.

The first connector may include a first connector body having a ring-shaped cross section and a first protrusion protruding from one end side in the extending direction of the first connector body and coupled to an outer circumferential surface of the damping member.

At this time, the first protrusions may be formed in a plurality of, and the plurality of first protrusions may be disposed along the circumferential direction of the first connector body.

The second connector may include a second connector body having a ring-shaped cross section, and a ring-shaped cross-section connecting member formed at one end side in the extending direction of the second connector body.

The coupling member may include a second projection protruding radially outwardly from the outer circumferential surface of the coupling member and coupled to an inner circumferential surface of the damping member.

At this time, the second protrusions may be formed in a plurality of, and the plurality of second protrusions may be disposed along the circumferential direction of the connection member.

At this time, the length of the first protrusion is equal to the length of the connecting member, so that the end of the first protrusion can touch the outer circumferential surface of the second connector body.

At this time, the first protrusion and the second protrusion may have a rectangular cross-section.

At this time, the connecting member may further include recessed grooves formed on both sides of the second projection to extend in the longitudinal direction of the second projection.

At this time, the thickness t2 of the damping member may be smaller than the sum of the thickness t1 in the width direction of the first protrusion and the thickness t3 in the width direction in the second protrusion.

At this time, the end surface of the damping member may have a concavo-convex shape.

At this time, the outer circumferential surface of the damping member may have a first coupling groove formed corresponding to the first projection and engageable with the first projection.

At this time, the inner circumferential surface of the damping member may have a second coupling groove formed corresponding to the second projection and engageable with the second projection.

At this time, the first engaging groove and the second engaging groove are formed in a plurality, and the plurality of first engaging grooves and the plurality of second engaging grooves may be alternately arranged along the circumferential direction.

At this time, the first connector and the second connector are made of a rigid material, and the damping member may be made of an elastic material.

At this time, the first connector body is press-fitted into the hollow shaft, and the coupling member is press-fitted into the second connector body.

According to another aspect of the present invention, there is provided a damping device comprising: a housing housing a hollow shaft for receiving a rotational force according to driving of a motor; a damping coupler coupled to the inner circumferential surface of the hollow shaft; a ring gear disposed on an inner surface of the housing; And a plurality of planetary gears disposed between the sun gear and the ring gear and external to the sun gear and in contact with the ring gear, the sun gear being a gear member.

The damping coupler and the speed reducer having the damping coupler according to an embodiment of the present invention may include a damping member to ensure a damping length while securing a thickness of the damping coupler, thereby ensuring damping force and durability suitable for an output.

The damping coupler according to the embodiment of the present invention and the speed reducer having the damping coupler according to the embodiment of the present invention can prevent the degradation of the performance due to the alignment failure when the rotational force of the motor is transmitted to the sun gear.

The damping coupler according to an embodiment of the present invention and the speed reducer having the damping coupler according to the present invention are intended to provide a damping coupler capable of improving the steering feeling by increasing the rigidity and preventing performance degradation due to the assembly tolerance between the shaft and the sun gear.

In addition, the damping coupler according to an embodiment of the present invention secures a hollow space inside the shaft and a damping coupler is coupled to the inside of the hollow, thereby securing a space for installing the damping member, and assembling in both directions of the shaft Do.

1 is a perspective view illustrating a speed reducer having a damping coupler according to an embodiment of the present invention.
2 is a cross-sectional view of a speed reducer having a damping coupler according to an embodiment of the present invention.
3 is a perspective view showing a damping coupler according to an embodiment of the present invention.
4 is an exploded perspective view of a damping coupler according to an embodiment of the present invention.
5 is a plan view showing the first protrusion, the second protrusion and the damping member of the damping coupler according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

1 is a perspective view illustrating a speed reducer having a damping coupler according to an embodiment of the present invention. 2 is a cross-sectional view of a speed reducer having a damping coupler according to an embodiment of the present invention.

In the following description, the direction from the pinion to the sun gear side is referred to as upward in FIG. 2, and the direction from the sun gear toward the pinion is defined as the rear direction.

1, a speed reducer 1 having a damping coupler 30 according to an embodiment of the present invention includes a housing 3, a sun gear 11, a ring gear 13, a plurality of planetary gears 15 And a damping coupler 30. In this case, in one embodiment of the present invention, the sun gear 11 may be a gear member.

Accordingly, the speed reducer 1 provided with the damping coupler 30 according to the embodiment of the present invention can not align the output of the motor (not shown) to the sun gear 11, And the vibration generated from the motor can be absorbed.

1, the housing 3 has a cylindrical shape and includes a sun gear 11, a ring gear 11, a plurality of planetary gears 15, and a drive shaft 5 of the motor. A receiving space can be formed so as to be accommodated.

Referring to FIGS. 1 and 2, the housing 3 may have a drive shaft 5 of a motor receiving a rotational force in accordance with the driving of the motor. At this time, a pinion 7 is formed at the lower end of the drive shaft 5, and the pinion can be rotated by engaging with a rack (not shown).

Further, in one embodiment of the present invention, the ring gear 13 is formed in a ring-shaped cross section and is arranged to be fixed to the inner surface of the housing 3. [ At this time, the inner peripheral surface of the ring gear 11 may be formed as a helical gear or a spur gear.

1, the sun gear 11 may be disposed at the center of the ring gear 13 and coupled to the drive shaft 5 and fixed thereto. The sun gear 11 can transmit the rotational force of the motor transmitted to the drive shaft 5 to the plurality of planetary gears 15.

Referring to FIGS. 1 and 2, a plurality of planetary gears 15 are disposed between the sun gear 11 and the ring gear 13. At this time, the plurality of planetary gears 15 can be in contact with the sun gear 11 and can be inscribed in the ring gear 13. Further, the planetary gear 15 can be inserted into the pin member 19 and can be rotatably engaged with the carrier 17.

Referring to FIG. 2, in one embodiment of the present invention, the carrier 17 may have a disc shape and the drive shaft 5 may be inserted into a center portion thereof. In addition, the carrier 17 can be formed such that the pin member 19 can be rotatably engaged with the drive shaft 5 in a radial manner.

1, a hollow shaft 9 may be disposed on the upper side of the sun gear 11 coupled with the drive shaft 5 to surround the outer circumferential surface of a part of the drive shaft. 1 and 2, in an embodiment of the present invention, the outer circumferential surface of the hollow shaft 9 may be a serration 9a.

2, in the embodiment of the present invention, a sun gear 11, a ring gear 13 and a plurality of planetary gears 15 are vertically arranged in a housing 3, (1) may include a damping coupler (30) according to an embodiment of the present invention.

3 is a perspective view showing a damping coupler according to an embodiment of the present invention. 4 is an exploded perspective view of a damping coupler according to an embodiment of the present invention. 5 is a plan view of the first protrusion, the second protrusion and the damping member of the damping coupler according to an embodiment of the present invention.

3 and 4, the upper side of the damping coupler is press-fitted to the inner peripheral surface of the hollow shaft 9, and the other side of the damping coupler 30 is press- The lower side of the damping coupler can be press-fitted to the coupling member 12 of the sun gear 11.

Accordingly, the damping coupler 30 according to the embodiment of the present invention can be installed inside the hollow portion of the shaft 9 to install the first connector 40, the second connector 50 and the damping member 60 Space can be ensured, and the damping coupler can be assembled in both directions of the shaft.

The damping coupler 30 according to an embodiment of the present invention includes a first connector 40, a second connector 50, and a damping member 60. The damping coupler 30 is disposed on an extension line of the motor rotation shaft and can transmit the rotational force of the motor to the sun gear 11.

Meanwhile, in one embodiment of the present invention, the first connector 40 includes a first connector body 41 and a first protrusion 43. At this time, the first connector body 41 has a ring-shaped cross section and may be formed into a cylindrical shape.

In the embodiment of the present invention, the first connector body 41 is press-fitted into the hollow shaft 9 to prevent the concentricity of the entire hollow shaft from being distorted, thereby preventing deterioration in quality.

3, in one embodiment of the present invention, the first protrusion 43 is formed on one end side of the first connector body 41 in the extending direction, for example, on the side of the first connector body 41 And is protruded on the lower side.

At this time, the first projection 43 may be coupled to the first coupling groove 62 formed on the outer peripheral surface of the damping member 60. The first protrusions 43 may be formed in a plurality of locations, and a plurality of first protrusions may be disposed along the circumferential direction of the first connector body 41.

3, in an embodiment of the present invention, the second connector 50 may include a second connector body 51, a connecting member 53, and a second protrusion 55. The second connector body 51 has a ring-shaped cross section and may be formed in a cylindrical shape.

At this time, the coupling member 12 of the sun gear 11 is press-fitted into the second connector body 51 to prevent the concentric center of the hollow shaft from being twisted, thereby preventing deterioration in quality.

Meanwhile, in an embodiment of the present invention, the connecting member 53 is formed on one end side in the extending direction of the second connector body 51, for example, on the upper side of the second connector body as shown in Fig. 3 . At this time, the connecting member 53 has a ring-shaped cross section and may be formed into a cylindrical shape.

In an embodiment of the present invention, the second protrusion 55 may be formed on the outer circumferential surface of the connecting member 53 and protrude radially outward of the connecting member. The second projection 55 may be engaged with the second coupling groove 64 formed on the inner peripheral surface of the damping member 60.

At this time, the connecting member 53 may be formed with recessed grooves 53a extending in the longitudinal direction of the second projection on both sides of the second projection 55.

The recessed groove 53a allows the damping member to be inserted and fixed while being resiliently deformed when the second projection 55 is engaged with the second engagement groove 64 of the damping member 60 made of an elastic material.

That is, a space in which the damping member 60, which is an elastic material, can be avoided during compression can be secured, so that the second projecting portion 55 can be easily coupled and fixed to the second engagement groove 64.

3, the second protrusions 55 may be formed in a plurality of shapes, and a plurality of second protrusions may be disposed along the circumferential direction of the connection member 53 in the embodiment of the present invention.

The first protrusion 43 is protruded from the lower side of the first connector body 41 and the second protrusion 55 is formed on the upper side of the second connector body 51 in the embodiment of the present invention. .

3, the length L1 of the first projecting portion 43 is equal to the length L2 of the connecting member 53 in the embodiment of the present invention, so that the end of the first projecting portion, for example, As shown in the figure, the lower end of the first projection contacts the upper side outer peripheral surface of the second connector body 51 to increase the supporting force.

3, in one embodiment of the present invention, the first protrusion 43 and the second protrusion 55 may have a rectangular cross-section, but the present invention is not limited thereto.

Meanwhile, in an embodiment of the present invention, the first connector 40 and the second connector 50 may be formed of a rigid material and the damping member 60 may be formed of an elastic material.

Accordingly, the damping coupler 30 according to the embodiment of the present invention improves the steering feeling by increasing the rigidity, and at the same time, can prevent the performance deterioration due to the assembly tolerance between the shaft 9 and the sun gear 11.

Referring to FIG. 3, in one embodiment of the present invention, the damping member 60 may be formed into a cylindrical shape having a ring-shaped cross section. 5, the thickness t2 of the damping member 60 may be smaller than the sum of the thickness t1 in the width direction of the first projection 43 and the thickness t3 in the width direction in the second projection 55 .

Accordingly, the damping coupler 30 according to the embodiment of the present invention secures the damping length while securing the damping force and the durability suitable for the motor torque while maintaining the thickness of the damping member 60 thin.

5, in one embodiment of the present invention, the cross section of the damping member 60 may have a concavo-convex shape. 3, the damping member 60 may have a first coupling groove 62 formed to correspond to the first projection 43 and coupled with the first projection.

This allows the first protrusion to be coupled through the first coupling groove 62 of the damping member 60 in the embodiment of the present invention, thereby allowing the damping member 60 to be easily coupled to the first connector 40 while maintaining a thin thickness of the damping member. .

Referring to FIG. 3, the inner circumferential surface of the damping member 60 may have a second engaging groove 64 formed to correspond to the second protrusion 55 and engageable with the second protrusion. The second protrusion 55 is coupled through the second coupling groove 64 of the damping member 60 in the embodiment of the present invention so that the thickness of the damping member can be maintained, Lt; / RTI >

At this time, the first engaging groove 62 and the second engaging groove 64 are formed in a plurality, and the plurality of first engaging grooves 62 and the plurality of second engaging grooves 64 are alternately arranged in the circumferential direction Lt; / RTI >

The damping coupler 30 according to the embodiment of the present invention can be easily combined with the first connector 40 and the second connector 50 while keeping the thickness of the damping member 60 thin. In addition, damping force and durability suitable for the motor rotational force can be ensured by securing the damping length.

3, one end of the first coupling groove 62 is formed in a round shape so that the first projection 43 can be easily coupled to and fixed to the first coupling groove in the embodiment of the present invention. have.

The damping coupler and the speed reducer having the damping coupler according to an embodiment of the present invention may include a damping member to ensure a damping length while securing a thickness of the damping coupler, thereby ensuring damping force and durability suitable for an output.

The damping coupler according to the embodiment of the present invention and the speed reducer having the damping coupler according to the embodiment of the present invention can prevent the degradation of the performance due to the alignment failure when the rotational force of the motor is transmitted to the sun gear.

The damping coupler according to an embodiment of the present invention and the speed reducer having the damping coupler according to the present invention are intended to provide a damping coupler capable of improving the steering feeling by increasing the rigidity and preventing performance degradation due to the assembly tolerance between the shaft and the sun gear.

In addition, the damping coupler according to an embodiment of the present invention secures a hollow space inside the shaft and a damping coupler is coupled to the inside of the hollow, thereby securing a space for installing the damping member, and assembling in both directions of the shaft Do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Reduction gear 3: Housing
5: drive shaft 7: pinion
9: Shaft 9a: Serration
11: sun gear 12: connecting member
13: ring gear 15: planetary gear
17: carrier 19: pin member
30: damping coupler 40: first connector
41: first connector body 43: first protrusion
50: second connector 51: second connector body
53: engaging member 53a: recessed groove
55: second projection 60: damping member
62: first engaging groove 64: second engaging groove

Claims (16)

A damping coupler, one side of which is coupled to the hollow shaft inner peripheral surface of the motor, the other side of which is coupled to the gear member, and which is disposed on an extension line of the motor rotation shaft and transmits rotational force of the motor to the gear member,
A first connector coupled to the interior of the hollow shaft;
A second connector in which a coupling member having a ring-shaped cross section formed at one end side in the extending direction of the gear member is coupled to the inside,
And a damping member having a ring-shaped cross section, wherein one side of the first connector is coupled to the outer circumferential surface, and the other side of the second connector is coupled to the inner circumferential surface to be elastically pressed. The method according to claim 1,
The first connector
A first connector body having a ring-shaped cross section and
And a first protrusion protruding from one end side in the extending direction of the first connector body and coupled to an outer circumferential surface of the damping member. 3. The method of claim 2,
Wherein the first protrusions are formed in a plurality of,
And the plurality of first protrusions are disposed along the circumferential direction of the first connector body. 3. The method of claim 2,
The second connector
A second connector body having a ring-shaped cross section and
And a connecting member having a ring-shaped cross section formed at one end side in the extending direction of the second connector body. 5. The method of claim 4,
And a second projection protruding radially outward from an outer circumferential surface of the connecting member and coupled to an inner circumferential surface of the damping member. 6. The method of claim 5,
The second protrusions are formed in a plurality of,
And the plurality of second projections are disposed along the circumferential direction of the connecting member. The method according to claim 6,
And the length of the first protrusion is equal to the length of the connecting member so that the end of the first protrusion contacts the outer circumferential surface of the second connector body. 8. The method of claim 7,
Wherein the first protrusion and the second protrusion are rectangular in cross section. 9. The method of claim 8,
Wherein the connecting member further comprises a recessed groove formed on both sides of the second projection and extending in the longitudinal direction of the second projection. 10. The method of claim 9,
Wherein the thickness t2 of the damping member is smaller than the sum of the width t1 of the first projection and the thickness t3 of the second projection. 6. The method of claim 5,
Wherein the damping member has a concavo-convex cross section. 12. The method of claim 11,
Wherein the damping member is formed on the outer circumferential surface of the damping member with a first engaging groove formed to correspond to the first protrusion and engageable with the first protrusion and the inner circumferential surface of the damping member is formed to correspond to the second protrusion, And a second engageable engaging groove is formed. 13. The method of claim 12,
The first engaging groove and the second engaging groove are formed in a plurality,
Wherein the plurality of first engagement grooves and the plurality of second engagement grooves are alternately arranged along the circumferential direction. The method according to claim 1,
Wherein the first connector and the second connector are made of a rigid material, and the damping member is made of an elastic material. 5. The method of claim 4,
The first connector body is press-fitted into the hollow shaft,
And the coupling member is press-fitted into the second connector body. A housing in which a hollow shaft for receiving a rotational force according to driving of the motor is accommodated;
A damping coupler according to any one of claims 1 to 15 coupled to the inner surface of the hollow shaft;
A ring gear disposed on an inner surface of the housing;
A sun gear coupled with the damping coupler,
And a plurality of planetary gears positioned between the sun gear and the ring gear and in contact with the ring gear and in contact with the ring gear,
And the sun gear is a gear member.
KR1020150186799A 2015-12-24 2015-12-24 Damping coupler and reducer having the same KR101770899B1 (en)

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Application Number Priority Date Filing Date Title
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KR101770899B1 true KR101770899B1 (en) 2017-08-23

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KR102261572B1 (en) * 2020-01-03 2021-06-07 재단법인대구경북과학기술원 Steering apparatus for vehicle
KR102291099B1 (en) * 2020-03-20 2021-08-20 남양넥스모 주식회사 Power steering apparatus for vehicle

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