KR101866098B1 - Reducer for vehicle - Google Patents

Reducer for vehicle Download PDF

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Publication number
KR101866098B1
KR101866098B1 KR1020160171615A KR20160171615A KR101866098B1 KR 101866098 B1 KR101866098 B1 KR 101866098B1 KR 1020160171615 A KR1020160171615 A KR 1020160171615A KR 20160171615 A KR20160171615 A KR 20160171615A KR 101866098 B1 KR101866098 B1 KR 101866098B1
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KR
South Korea
Prior art keywords
worm
heat
shaft
gear
worm shaft
Prior art date
Application number
KR1020160171615A
Other languages
Korean (ko)
Inventor
이경택
Original Assignee
주식회사 만도
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Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020160171615A priority Critical patent/KR101866098B1/en
Application granted granted Critical
Publication of KR101866098B1 publication Critical patent/KR101866098B1/en

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Classifications

    • 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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0454—Worm gears
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
    • F16H57/0416—Air cooling or ventilation
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0498—Worm gearings

Abstract

The present invention relates to a reducer for a vehicle, which comprises: a worm wheel which is disposed in a gear housing, and of which inner circumferential surface is coupled to a steering shaft; a worm shaft of which outer circumferential surface has worms to be engaged with the worm wheel; and a heat radiation member having a gear unit, located at one side of the worm shaft in a plate-shape to radiate heat of the worm shaft, engaged with the steering shaft to be rotated, protruding between the worms on a surface facing the worm shaft to be spaced from the worms so as to be maintained in a state of being spaced from the worms. Therefore, heat in the worm shaft and the gear housing can be radiated.

Description

Reducer for vehicle

The present invention relates to a speed reducer for an automobile. More specifically, the present invention relates to a speed reducer of an automobile, and more particularly, to a radiator for radiating heat of a worm shaft to radiate frictional heat generated when a worm wheel is rotated by a rotational force of a worm shaft, The worm wheel can be prevented from being inflated and the teeth of the worm and the worm wheel can be normally engaged, thereby preventing power loss and stably providing the steering assist force to the driver.

1, a speed reducer 100 of a conventional automobile is provided with a worm shaft 154 on which a worm 152 is formed. The worm shaft 154 is provided with a worm shaft bearing 154 on both ends thereof. And the worm shaft 154 is installed to support the worm shaft 154 and the plug bolt 110 is fixed to the damping coupler 140 and the worm shaft bearing 154 in order to prevent the worm shaft bearing 157 from leaking in the axial direction of the worm shaft 154 157, and the plug bolts 110 are fixed by the plug nuts 120. As shown in Fig.

The worm shaft 154 is connected to the motor 146 via the damping coupler 140 and the worm shaft 154 is rotated by the driving of the motor 146. [

A worm wheel 156 is provided on the outer diameter of the worm 152 so that the worm 152 can be engaged with the worm 152 formed on the worm shaft 154. The worm wheel 156 is rotated by the rotational force of a steering wheel And the rotational force of the worm shaft 154 by the driving of the motor 146 is transmitted to the steering shaft 106. [

The gear housing 160 is provided with a motor 146 for providing a driving force to the worm shaft 154 at one side of the gear housing 160 and a worm 152 and a worm wheel 156. The gear housing 160 includes a gear housing 160, The motor 146 is coupled to the bolt 150 by a motor cover 130.

The speed reducer of the automobile having such a structure controls the driving of the motor by the electronic control unit provided in the vehicle according to the driving condition of the vehicle and the rotating force of the worm shaft by the driving of the motor is added to the turning force of the steering wheel operated by the driver So that the steering operation state of the driver can be maintained smoothly and stably by being transmitted to the steering shaft.

However, in such a conventional vehicle speed reducer, friction between the worm wheel and the worm shaft is maintained by rotating the worm wheel by the rotational force of the worm shaft due to the driving of the motor, and thus the temperature of the worm shaft and the worm wheel is increased. Particularly, As a result, there is a problem that the coupling between the worm shaft and the worm shaft is not normally performed, and the power loss is generated, and the steering assist force can not be stably provided to the driver.

Also, when the worm wheel is inflated due to the frictional heat between the worm shaft and the worm wheel, wear is generated between the worm shaft and the worm wheel, and the durability is disadvantageously deteriorated, and noise is generated when the worm wheel transmits rotational force to the worm wheel.

The present invention has been made in view of the background mentioned above and has a heat dissipating member for dissipating heat of a worm shaft, dissipating frictional heat generated when the worm wheel is rotated by the rotational force of the worm shaft by driving the motor, lowering the temperature of the worm wheel, The worm gear and the worm wheel can be normally engaged with each other, thereby preventing power loss and stably providing a steering assist force to the driver.

In addition, since the frictional heat of the worm and the worm wheel is transferred to the boss, the durability of the worm wheel is improved as the temperature of the worm wheel is lowered, and the noise generated when the rotational force is transmitted from the worm shaft to the worm wheel is prevented, To provide a speed reducer of the present invention.

The objects of the present invention are not limited thereto, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

According to the present invention, a worm wheel is provided inside a gear housing and coupled to a steering shaft on an inner circumferential surface thereof. The worm wheel is formed in a plate shape so as to radiate heat from a worm shaft and a worm shaft, And a heat dissipating member which is rotated by engaging with the steering shaft and is provided with a gear portion protruding from the worm on the surface facing the worm shaft and spaced apart from the worm and maintaining a state of being separated from the worm, .

According to the present invention, a heat dissipating member for dissipating the heat of the worm shaft is provided to dissipate the frictional heat generated when the worm wheel is rotated by the rotational force of the worm shaft by driving the motor, and to prevent the worm wheel from being inflated by lowering the temperature of the worm wheel. And the teeth of the worm and the worm wheel can be normally engaged, thereby preventing the power loss and stably providing the steering assist force to the driver.

Also, since the frictional heat of the worm and the worm wheel is transferred to the boss, the durability of the worm wheel is improved as the temperature of the worm wheel is lowered, and noise is prevented from being generated when transmitting the rotational force from the worm shaft to the worm wheel. .

1 is a sectional view showing a speed reducer of a conventional automobile.
2 is a cross-sectional view of a portion of a speed reducer of an automobile according to embodiments of the present invention.
3 is a perspective view of a portion of a speed reducer of an automobile according to embodiments of the present invention.
4 is a cross-sectional view of a portion of a speed reducer of an automobile according to embodiments of the present invention.
5 is a perspective view illustrating an example in which a heat dissipating member of a speed reducer of an automobile is provided in a gear structure according to embodiments of the present invention.
6 is a perspective view illustrating an example in which a heat dissipating member of a speed reducer of an automobile according to embodiments of the present invention is provided in a belt structure.
7 is a perspective view illustrating an embodiment in which an auxiliary radiating member is additionally provided in a speed reducer of an automobile according to embodiments of the present invention.
Fig. 8 is a sectional view of Fig. 7. Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, the terms first, second, A, B, (a), (b), and the like can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

3 is a perspective view of a part of a speed reducer of an automobile according to an embodiment of the present invention, and FIG. 4 is a perspective view of a part of a reduction gear of an automobile according to an embodiment of the present invention FIG. 5 is a perspective view showing an example in which a heat dissipating member of a speed reducer of an automobile according to an embodiment of the present invention is provided with a gear structure, and FIG. 6 is a perspective view of an embodiment of the present invention FIG. 7 is a perspective view showing an embodiment in which an auxiliary radiating member is additionally provided in a speed reducer of an automobile according to the embodiments of the present invention. FIG. 7 is a perspective view showing an embodiment in which a heat radiating member , And Fig. 8 is a sectional view of Fig.

1 and FIG. 1, the speed reducer of an automobile according to the embodiments includes a worm wheel 201 provided inside a gear housing 250 and having a steering shaft 230 coupled to an inner circumferential surface thereof, The worm 205 is formed on an outer circumferential surface of the worm shaft 203 and is engaged with the worm wheel 201. The worm shaft 203 is disposed on one side of the worm shaft 203, A gear portion 211 protruding from the worm 205 and protruding from the worm 205 so as to be spaced apart from the worm 205 and maintaining a state spaced apart from the worm 205, And a heat dissipation member 210 having a heat dissipation structure.

The worm wheel 201 is mounted on a steering shaft 230 that transmits the rotational force of a steering wheel (not shown) operated by a driver and the teeth formed on the outer circumferential side are engaged with the worm 205 of the worm shaft 203, 1), and transmits the rotational force of the worm shaft 203 to the steering shaft 230.

The worm shaft 203 is connected to the motor 146 through a damping coupler (see 140 in FIG. 1), and the worm shaft 203 is rotated by driving of the motor 146.

A worm wheel 201 is provided on the outer peripheral side of the worm shaft 203 so that the worm 205 formed on the worm shaft 203 can be engaged with the worm wheel 201. A worm shaft 203 is provided inside the gear housing 250, A worm wheel 201 is provided.

The worm shaft 203 rotates the worm wheel 201 and friction heat is generated between the worm shaft 203 and the worm wheel 201 due to the friction between the worm shaft 203 and the worm wheel 201. The worm wheel 203 is made of an insulating material such as plastic The worm wheel 201 is inflated due to the frictional heat and the performance is deteriorated and the worm wheel 201 can not transmit the driving force of the motor 146 to the steering shaft 230. Therefore, (210) is provided to dissipate heat.

The heat dissipating member 210 is formed in a disk shape and is coupled to the steering shaft 230 to be positioned at one side of the worm axis 203 and protrudes between the worms 205 on the surface facing the worm axis 203, And the gear portion 211 maintains a distance from the worm 205 so as to dissipate the heat of the worm 205. [

The gear portion 211 protrudes between the worms 205 and is located at a position close to the worm 205 and is spaced apart from the worm 205. The gear portion 211 is positioned at a distance from the worm 205, (205). ≪ / RTI >

The heat dissipating member 210 is engaged with the steering shaft 230 so that when the worm shaft 203 and the worm wheel 201 are engaged with each other as the motor 146 is driven to rotate, the steering shaft 230 rotates the heat dissipating member 210 The gear portion 211 is prevented from hitting against the worm 205 and the gear portion 211 is rotated by engaging with the worm 205 so that the gear portion 211 can be kept apart from the worm 205.

The heat dissipating member 210 is provided with a plurality of heat dissipating fins 513 protruding from a surface opposite to the surface facing the worm axis 203.

The radiating fins 513 can enlarge a contact area with the air inside the gear housing 250 and effectively dissipate the heat of the worm shaft 203 into the gear housing 250.

A lubricant may be provided in the spaced space between the worm 205 and the gear portion 211. The lubricant may more efficiently transmit the heat of the worm shaft 203 to the gear portion 211, 210 heat the transferred heat to the inside of the gear box.

The lubricant may be provided by grease or the like and a lubricant may be provided between the worm 205 and the gear portion 211 rather than the heat is transferred between the worm 205 and the gear portion 211 through air, So that the heat of the worm shaft 203 can be transmitted to the gear portion 211 more effectively.

The gear portion 211 may be formed of, for example, a spiroid gear or a hypoid gear or a helicon gear, and the hill part protruding between the worms 205 may be curved And is formed to have a small thickness so as not to collide with the worm 205, and the space of the valley portion is formed to be wide.

The gear portion 211 is formed on one side of the disk instead of being formed on the outer circumferential surface of the heat dissipating member 210 formed in a disk shape so that the gear portion 211 is formed on one side of the heat dissipating member 210 And the worm 205 of the worm shaft 203 is located on the outermost side in the radial direction of one side of the heat dissipating member 210.

The heat dissipating member 210 is biased toward the joining portion of the motor 146 of the worm shaft 203 or biased toward the opposite side of the joining portion of the motor 146 of the worm shaft 203 to be engaged with the worm wheel 201 of the worm shaft 203 The heat dissipating member 210 is engaged with a lubricating agent.

In other words, the heat dissipating member 210 is positioned so that the gear portion 211 is separated from the worm shaft 203 at a position where the worm wheel 201 is engaged with the worm wheel 201, effectively dissipating frictional heat between the worm shaft 203 and the worm wheel 201, The performance of the worm shaft 203 and the worm wheel 201 is increased.

5 (a) and 5 (b), in order that the gear portion 211 of the heat dissipating member 210 keeps the worms 205 interposed between the worms 205 at the position where the worm shaft 203 and the worm wheel 201 mesh, 6 and the gear structure or the belt structure with the steering shaft 230, thereby preventing the size of the heat dissipating member 210 from becoming large.

That is, when the heat dissipating member 210 is coupled to the steering shaft 230, the gear portion 211 of the heat dissipating member 210 is engaged with the worm 205 at a position where the worm shaft 203 and the worm wheel 201 mesh with each other. The size of the heat dissipating member 210 is larger than that of the worm wheel 201 so that the entire size of the speed reducer becomes larger. Therefore, the heat dissipating member 210 is engaged with the steering shaft 230 in a gear structure or a belt structure, Thereby preventing the size from increasing.

Also, a gear structure or a belt structure may be provided to adjust the rotational speed difference between the steering shaft 230 and the heat dissipating member 210, and also to adjust the size of the heat dissipating member 210.

5, a driving gear 535 is formed on the steering shaft 230 and a driving gear 535 is coupled to the driving gear 535 on the opposite side of the surface of the heat dissipating member 210 facing the worm axis 203 515 are formed.

The driven gear 515 has a plurality of radiating fins 513 protruding from the surface thereof facing the gear housing 250 and the plurality of radiating fins 513 are spaced apart from each other.

The gear ratio of the driving gear 535 and the driven gear 515 is set such that the driving gear 535 and the driven gear 515 are engaged with each other when the steering shaft 230 rotates, The worm 205 can be maintained in a state of being separated from the worm 205 when the motor 146 is driven when the worm 205 of the worm 203 is rotated, .

6, a driving pulley 637 is formed on the steering shaft 230 and a driving pulley 637 and a belt 607 are provided on the opposite side of the surface of the heat radiation member 210 facing the worm axis 203, A driven pulley 617 which is engaged with the driven pulley 617 is formed.

The driven pulley 617 has a plurality of radiating fins 513 protruding from the surface facing the gear housing 250 and the several radiating fins 513 are formed to be spaced apart from each other.

The gear ratio of the drive pulley 637 and the driven pulley 617 is set such that the drive pulley 637 and the driven pulley 617 are engaged when the steering shaft 230 rotates so that the gear portion 211 of the heat- The worm 205 can be maintained in a state of being separated from the worm 205 when the motor 146 is driven when the worm 205 of the worm 203 is rotated, .

7 to 8, the gear housing 250 is further provided with an auxiliary heat dissipating member 770 on the surface facing the heat dissipating fin 513 to dissipate heat inside the gear housing 250 It is possible.

A coupling hole 751 is formed in the gear housing 250 facing the radiating fin 513 so that the auxiliary radiating member 770 is coupled to the gear housing 250. The plate auxiliary auxiliary radiating member 770 are seated and coupled.

The auxiliary radiating member 770 is coupled to the coupling hole 751 of the gear housing 250 to lower the atmospheric temperature inside the gear housing 250. As the atmospheric temperature inside the gear housing 250 is lowered, The heat exchanger 210 can more effectively dissipate the heat of the worm shaft 203 into the gear housing 250 and activate the heat exchange from the worm shaft 203 to the outside of the gear housing 250.

A plurality of auxiliary radiating fins 771 protruding from the surface of the auxiliary radiating member 770 opposite to the radiating fins 513 are provided to widen the contact area with air outside the gear housing 250, ) Effectively dissipates the heat inside.

The auxiliary heat dissipating member 770 may be inserted into the coupling hole 751 of the gear housing 250 or coupled thereto via the rotation support member 809 and will be described below with reference to FIG.

8A, the auxiliary radiating member 770 is provided with a coupling portion 873 protruding along the periphery of the auxiliary radiating member 770 on the surface facing the radiating fin 513, 751, respectively.

At this time, the auxiliary heat dissipating member 770 is inserted and coupled to the gear housing 250. The coupling hole 751 and the coupling portion 873 are tightly coupled to each other to dissipate the heat inside the gear housing 250 to the outside.

8 (b), the auxiliary radiation member 770 is coupled to the coupling hole 751 via the rotation support member 809, and the auxiliary radiation member 770 is connected to the radiation member 210 And is rotated together to fix the position of the heat dissipating member 210 to the inside of the gear housing 250.

The auxiliary radiating member 770 is provided with a cylindrical connecting portion 875 protruding from the surface facing the radiating fin 513 of the auxiliary radiating member 770 so as to be coupled with and rotated together with the radiating member 210, The auxiliary radiating member 775 and the radiating member 210 are rotated together by coupling the radiating member 875 to the radiating member 210.

The heat of the heat dissipating member 210 is directly transmitted to the auxiliary heat dissipating member 770 through the connection portion 875 as the auxiliary heat dissipating member 770 is coupled to the heat dissipating member 210 via the connection portion 875 The heat of the heat dissipating member 210 transmitted from the worm shaft 203 is more effectively transmitted to the auxiliary heat dissipating member 770 and the auxiliary heat dissipating member 770 radiates heat to the outside of the gear housing 250.

At this time, the rotation support member 809 may be formed of, for example, a ball bearing.

According to embodiments of the present invention having such a shape and structure, a heat dissipating member for dissipating heat of the worm shaft is provided, heat of the frictional heat generated when the worm wheel is rotated by the rotational force of the worm shaft by driving the motor is dissipated, The worm wheel is prevented from being inflated and the teeth of the worm and the worm wheel can be normally engaged, thereby preventing power loss and stably providing the steering assist force to the driver.

In addition, since the frictional heat of the worm and the worm wheel is transferred to the boss, the durability of the worm wheel is improved as the temperature of the worm wheel is lowered, and noise is prevented from being generated when the rotational force is transmitted from the worm shaft to the worm wheel. .

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

201: Worm wheel 203: Worm shaft
205: worm 210: heat dissipating member
211: gear portion 230: steering shaft
250: gear housing 513: radiating fin
515: driven gear 535: drive gear
607: belt 617: driven pulley
637: Driving pulley 770: Auxiliary heat radiating member
771: auxiliary radiating fin 751: coupling hole
809: Rotation support member 873:
875: Connection

Claims (9)

A worm wheel provided inside the gear housing and having a steering shaft coupled to an inner circumferential surface thereof;
A worm shaft having a worm formed on its outer peripheral surface and engaged with the worm wheel; And
The worm shaft is formed in a plate shape so as to dissipate the heat of the worm shaft. The worm shaft is disposed at one side of the worm shaft and rotated with the steering shaft. The worm shaft is protruded from a surface facing the worm shaft, And a heat dissipation member having a gear portion that maintains a state of being separated from the worm,
Wherein the heat radiating member is located on the motor coupling portion of the worm shaft or on the opposite side of the motor coupling portion, the gear portion is formed along a radially outermost circumference of one side of the heat radiating member, And is located radially outermost among the one side surface. The method according to claim 1,
And a lubricant is provided in a spaced space between the worm and the gear portion. The method according to claim 1,
Wherein the heat dissipating member has a plurality of radiating fins protruding from a surface opposite to the surface facing the worm axis. The method of claim 3,
Wherein a driving gear is formed on the steering shaft so that the heat dissipating member is engaged with the steering shaft and a driven gear that is engaged with the driving gear is formed on a surface of the heat dissipating member opposite to the surface facing the worm axis. Speed reducer. The method of claim 3,
A driving pulley is formed on the steering shaft so that the heat dissipating member is engaged with the steering shaft, and a driven pulley is formed on a surface of the heat dissipating member opposite to the worm axis, the driven pulley meshing with the driving pulley via a belt Features a car's speed reducer. The method of claim 3,
Wherein a coupling hole is formed in a gear housing facing the radiating fin to dissipate the heat between the radiating member and the gear housing to the outside, and a plate-shaped auxiliary radiating member is seated and coupled to the coupling hole. reducer. The method according to claim 6,
Wherein the auxiliary radiating member has a plurality of auxiliary radiating fins protruding from a surface opposite to the surface facing the radiating fin. The method according to claim 6,
Wherein the auxiliary radiating member includes a coupling portion protruding along the periphery of the auxiliary radiating member on a surface facing the radiating fin and inserted into the coupling hole to be coupled. The method according to claim 6,
Wherein the auxiliary radiating member is coupled to the coupling hole via a rotation support member and has a cylindrical connecting portion protruding from a surface of the auxiliary radiating member facing the radiating fin and the connecting portion is coupled to the radiating member, And radiates the heat of the heat radiating member to the outside.
KR1020160171615A 2016-12-15 2016-12-15 Reducer for vehicle KR101866098B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160171615A KR101866098B1 (en) 2016-12-15 2016-12-15 Reducer for vehicle

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KR1020160171615A KR101866098B1 (en) 2016-12-15 2016-12-15 Reducer for vehicle

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KR101866098B1 true KR101866098B1 (en) 2018-06-08

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004320879A (en) * 2003-04-15 2004-11-11 Mitsuba Corp Motor with speed reduction mechanism
KR20050021838A (en) * 2003-08-27 2005-03-07 삼성전자주식회사 Gear cooling apparatus
JP2012207737A (en) * 2011-03-30 2012-10-25 Jtekt Corp Worm reduction gear and electric power steering apparatus
JP2014101989A (en) * 2012-11-22 2014-06-05 Toyota Motor Corp Rotation driving device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004320879A (en) * 2003-04-15 2004-11-11 Mitsuba Corp Motor with speed reduction mechanism
KR20050021838A (en) * 2003-08-27 2005-03-07 삼성전자주식회사 Gear cooling apparatus
JP2012207737A (en) * 2011-03-30 2012-10-25 Jtekt Corp Worm reduction gear and electric power steering apparatus
JP2014101989A (en) * 2012-11-22 2014-06-05 Toyota Motor Corp Rotation driving device

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